@layer reset, base, theme, components, utilities, print;

@layer reset {
  html {
    box-sizing: border-box;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
  }

  body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd, fieldset {
    margin: 0;
  }

  ul, ol {
    padding-inline-start: 1.35rem;
  }

  img, svg {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

  input, button, textarea, select {
    font: inherit;
    color: inherit;
    box-sizing: border-box;
  }
}

@layer theme {
  :root {
    /* Tier 1 & 2: Core & Semantic Tokens */
    --bg-page: #f1f5f9;
    --bg-surface: #ffffff;
    --bg-subtle: #f8fafc;
    --bg-elevated: #eff6ff;
    --text-main: #0f172a;
    --text-secondary: #334155;
    --text-muted: #475569;
    --border-color: #cbd5e1;
    --border-strong: #64748b;

    --brand-primary: #0f4c81;
    --brand-primary-hover: #0b3960;
    --brand-accent: #0284c7;
    --brand-light: #e0f2fe;

    --operator-bg: #f0fdf4;
    --operator-border: #15803d;
    --operator-text: #14532d;

    --engineer-bg: #f8fafc;
    --engineer-border: #1d4ed8;
    --engineer-text: #1e3a8a;

    --warning-bg: #fffbeb;
    --warning-border: #b45309;
    --warning-text: #78350f;

    --danger-bg: #fef2f2;
    --danger-border: #b91c1c;
    --danger-text: #7f1d1d;

    /* v13 Stage 6: 5 System Color Tokens (Contrast >= 4.5:1) */
    --sys-steam-bg: #fee2e2;
    --sys-steam-accent: #b91c1c;
    --sys-condensate-bg: #fef3c7;
    --sys-condensate-accent: #b45309;
    --sys-chillers-bg: #e0f2fe;
    --sys-chillers-accent: #0369a1;
    --sys-air-bg: #ccfbf1;
    --sys-air-accent: #0f766e;
    --sys-ro-bg: #ede9fe;
    --sys-ro-accent: #6d28d9;

    /* v13 Stage 6: 5 Font Size Tokens */
    --font-size-caption: 0.78rem;
    --font-size-body: 0.95rem;
    --font-size-card-title: 1.05rem;
    --font-size-section-title: 1.35rem;
    --font-size-hero-title: 1.75rem;

    /* v13 Stage 6: Spacing Scale (8 / 12 / 16 / 24 / 32 / 48 px) */
    --space-8: 8px;
    --space-12: 12px;
    --space-16: 16px;
    --space-24: 24px;
    --space-32: 32px;
    --space-48: 48px;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.1);

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans Hebrew", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  }
}

@layer base {
  body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.6;
    font-size: 1rem;
    min-block-size: 100dvh;
    overflow-x: hidden;
  }

  h1, h2, h3, h4 {
    line-height: 1.28;
    color: var(--text-main);
    font-weight: 700;
  }

  h1 { font-size: clamp(1.2rem, 2vw, 1.55rem); }
  h2 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); margin-block-end: 0.75rem; }
  h3 { font-size: clamp(1.02rem, 1.4vw, 1.18rem); margin-block-end: 0.5rem; }
  h4 { font-size: 1rem; margin-block-end: 0.4rem; }

  p {
    margin-block-end: 0.75rem;
    max-inline-size: 78ch;
  }

  a {
    color: var(--brand-primary);
    text-underline-offset: 3px;
  }

  a:hover {
    color: var(--brand-primary-hover);
  }

  code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding-inline: 0.3rem;
    padding-block: 0.05rem;
    direction: ltr;
    unicode-bidi: isolate;
    display: inline-block;
  }

  /* Focus ring for keyboard navigation */
  :focus-visible {
    outline: 3px solid var(--brand-accent);
    outline-offset: 2px;
  }

  /* Modal dialog scroll containment per modern-web-guidance */
  dialog:modal {
    overscroll-behavior: contain;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 0;
    max-inline-size: min(92vw, 820px);
    max-block-size: 88dvh;
    box-shadow: var(--shadow-md);
    background: var(--bg-surface);
    color: var(--text-main);
  }

  dialog.fullscreen-diagram-dialog:modal {
    max-inline-size: 96vw;
    inline-size: 96vw;
    max-block-size: 92dvh;
  }

  dialog::backdrop {
    overflow: hidden;
    overscroll-behavior: contain;
    background-color: rgba(15, 23, 42, 0.58);
    backdrop-filter: blur(2px);
  }
}

@layer components {
  /* Skip link */
  .skip-link {
    position: absolute;
    inset-block-start: -100px;
    inset-inline-start: 1rem;
    background: var(--brand-primary);
    color: #ffffff;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    z-index: 1000;
    text-decoration: none;
    font-weight: 600;
  }
  .skip-link:focus {
    inset-block-start: 0.75rem;
  }

  /* Top Header (v13: Single Row on >= 768px, Top Bar + Fixed Bottom Nav on < 768px) */
  .site-header {
    background: #0f2f52;
    color: #ffffff;
    position: sticky;
    inset-block-start: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
  }

  .header-top,
  .header-top-row {
    max-inline-size: 1200px;
    margin-inline: auto;
    padding-block: 12px;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
    display: flex;
    flex-wrap: nowrap;
    gap: 0.75rem;
    align-items: center;
    justify-content: space-between;
  }

  .brand-block {
    display: flex;
    align-items: center;
    min-inline-size: 0;
    flex: 0 1 auto;
  }

  .brand-block h1,
  .brand-title {
    font-size: clamp(0.95rem, 1.4vw, 1.125rem);
    font-weight: 700;
    color: #ffffff;
    margin: 0;
    display: flex;
    align-items: center;
    min-inline-size: 0;
  }

  .brand-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    min-block-size: 44px;
    min-inline-size: 0;
  }

  .brand-link:hover {
    color: #e0f2fe;
  }

  .brand-link svg {
    flex-shrink: 0;
  }

  #site-title-el {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* v13.1.1: планшет 768–1023 px — рядом с названием стоит полное меню.
     Меню ужимается, а короткое название может перенестись на две строки, чтобы не обрезаться до «Инж…». */
  @media (min-width: 768px) and (max-width: 1023.98px) {
    .header-top,
    .header-top-row {
      gap: 8px;
    }

    .site-header .nav-bar {
      gap: 2px;
    }

    .site-header .nav-bar .nav-pill {
      font-size: 0.78rem;
      padding: 8px 6px;
    }

    .site-header .header-controls {
      gap: 6px;
    }

    .site-header .brand-link {
      gap: 8px;
    }

    .site-header #site-title-el {
      white-space: normal;
      line-height: 1.15;
      font-size: 0.95rem;
    }
  }

  @media (max-width: 480px) {
    .header-top,
    .header-top-row {
      padding-inline: 10px;
      gap: 6px;
    }

    .brand-block h1,
    .brand-title {
      font-size: 0.88rem;
    }

    .brand-link {
      gap: 6px;
    }

    .brand-link svg {
      width: 22px;
      height: 22px;
    }

    .header-controls {
      gap: 6px;
    }
  }

  .badge-sub {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(56, 189, 248, 0.22);
    color: #e0f2fe;
    border: 1px solid rgba(56, 189, 248, 0.5);
    padding: 0.12rem 0.5rem;
    border-radius: 999px;
  }

  .site-subtitle,
  .brand-subtitle {
    font-size: 0.8rem;
    color: #bae6fd;
    margin: 0;
    max-inline-size: 85ch;
  }

  .nav-bar {
    display: flex;
    flex-wrap: nowrap;
    gap: 4px;
    align-items: center;
    justify-content: center;
    margin-inline: auto;
    padding: 0;
    background: transparent;
    border: none;
  }

  .nav-pill {
    color: #e2e8f0;
    text-decoration: none;
    font-size: clamp(0.84rem, 1.1vw, 0.9375rem);
    font-weight: 500;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid transparent;
    white-space: nowrap;
    min-block-size: 44px;
    display: inline-flex;
    align-items: center;
    transition: background-color 0.12s ease, color 0.12s ease;
  }

  .nav-pill:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
  }

  .nav-pill.active {
    background: rgba(255, 255, 255, 0.14);
    color: #ffffff;
    font-weight: 600;
  }

  .header-controls {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    align-items: center;
    flex-shrink: 0;
  }

  .search-toggle-btn {
    inline-size: 44px;
    block-size: 44px;
    min-inline-size: 44px;
    min-block-size: 44px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: transparent;
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.12s ease, border-color 0.12s ease;
  }

  .search-toggle-btn:hover,
  .search-toggle-btn[aria-expanded="true"] {
    background: rgba(255, 255, 255, 0.14);
    border-color: #7dd3fc;
  }

  .lang-switch-group {
    display: inline-flex;
    align-items: center;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    overflow: hidden;
    background: rgba(15, 23, 42, 0.25);
  }

  .lang-switch-group .lang-btn {
    min-block-size: 44px;
    min-inline-size: 44px;
    padding: 0 10px;
    border: none;
    border-radius: 0;
    background: transparent;
    color: #e2e8f0;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .lang-switch-group .lang-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
  }

  .lang-switch-group .lang-btn.active {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
    font-weight: 700;
  }

  .header-search-drawer {
    background: #0b223d;
    border-block-start: 1px solid rgba(255, 255, 255, 0.15);
    padding-block: 10px;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
  }

  .header-search-drawer[hidden] {
    display: none !important;
  }

  .header-search-drawer-inner {
    max-inline-size: 1200px;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .header-search-drawer .search-box {
    flex: 1 1 auto;
  }

  .search-box #global-search {
    background: #ffffff;
    color: #0f172a;
    border: 1px solid #7dd3fc;
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 0.92rem;
    inline-size: 100%;
    min-block-size: 44px;
  }

  .search-drawer-close-btn {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.3);
    min-inline-size: 44px;
    min-block-size: 44px;
    justify-content: center;
  }

  .mobile-bottom-nav {
    display: none;
  }

  .search-results-banner {
    display: none;
    background: #eff6ff;
    border: 1px solid #60a5fa;
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    margin-block-end: 1rem;
  }

  .node-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 1.15rem;
    background: #0f172a;
    color: #ffffff;
    border-block-end: 2px solid #38bdf8;
  }

  .node-dialog-header h3 {
    color: #ffffff;
    margin: 0;
    font-size: 1.05rem;
  }

  .node-dialog-header .btn {
    background: rgba(255, 255, 255, 0.14);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.38);
  }

  .node-dialog-body {
    padding: 1rem 1.15rem;
    overflow-y: auto;
    max-block-size: calc(88dvh - 64px);
  }

  /* Search box in header */
  .search-container {
    position: relative;
    flex: 1 1 250px;
    max-inline-size: 380px;
  }

  .search-input-wrap {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: var(--radius-sm);
    padding-inline: 0.5rem;
  }

  .search-input-wrap:focus-within {
    background: #ffffff;
    color: var(--text-main);
    border-color: #38bdf8;
  }

  .search-input {
    inline-size: 100%;
    border: none;
    background: transparent;
    color: inherit;
    padding-block: 0.42rem;
    padding-inline: 0.4rem;
    font-size: 0.92rem;
    min-block-size: 40px;
  }

  .search-input::placeholder {
    color: rgba(255, 255, 255, 0.8);
  }
  .search-input-wrap:focus-within .search-input::placeholder {
    color: var(--text-muted);
  }

  .search-clear-btn {
    background: transparent;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 0.25rem 0.4rem;
    font-size: 0.9rem;
    border-radius: 4px;
  }

  .search-dropdown {
    position: absolute;
    inset-block-start: calc(100% + 6px);
    inset-inline-start: 0;
    inset-inline-end: 0;
    background: var(--bg-surface);
    color: var(--text-main);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    max-block-size: 70dvh;
    overflow-y: auto;
    z-index: 200;
    padding: 0.5rem;
  }

  .search-result-item {
    display: block;
    inline-size: 100%;
    text-align: start;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: 0.55rem 0.65rem;
    cursor: pointer;
    transition: background-color 0.12s ease;
  }

  .search-result-item:hover,
  .search-result-item:focus-visible {
    background: var(--bg-elevated);
    border-color: #93c5fd;
  }

  /* Language switcher pill */
  .lang-switch-group {
    display: inline-flex;
    background: rgba(15, 23, 42, 0.45);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: var(--radius-sm);
    overflow: hidden;
  }

  .lang-btn {
    background: transparent;
    color: #e2e8f0;
    border: none;
    padding-block: 0.4rem;
    padding-inline: 0.7rem;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    min-block-size: 40px;
  }

  .lang-btn[aria-pressed="true"] {
    background: #38bdf8;
    color: #0f172a;
  }

  /* Primary navigation bar in header */
  .header-nav-bar {
    background: rgba(15, 23, 42, 0.5);
    border-block-start: 1px solid rgba(255, 255, 255, 0.14);
  }

  .header-nav-inner {
    max-inline-size: 1440px;
    margin-inline: auto;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
    padding-block: 0.35rem;
  }

  .main-nav-btn {
    background: transparent;
    color: #f1f5f9;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding-block: 0.4rem;
    padding-inline: 0.75rem;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    min-block-size: 40px;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
  }

  .main-nav-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
  }

  .main-nav-btn[aria-current="page"] {
    background: #ffffff;
    color: #0f172a;
    font-weight: 700;
    box-shadow: var(--shadow-sm);
  }

  /* System selector sub-bar */
  .system-subnav {
    background: var(--bg-surface);
    border-block-end: 1px solid var(--border-color);
    padding-block: 0.45rem;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
  }

  .system-subnav-inner {
    max-inline-size: 1440px;
    margin-inline: auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
  }

  .sys-pill-btn {
    background: var(--bg-subtle);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding-block: 0.35rem;
    padding-inline: 0.8rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    min-block-size: 38px;
    transition: background-color 0.15s ease, border-color 0.15s ease;
  }

  .sys-pill-btn:hover:not(:disabled) {
    background: var(--bg-elevated);
    border-color: var(--brand-accent);
  }

  .sys-pill-btn[aria-pressed="true"] {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }

  /* Main content container */
  .app-main {
    max-inline-size: 1440px;
    margin-inline: auto;
    padding-block: 1.25rem 2.5rem;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
  }

  /* Breadcrumb bar */
  .breadcrumb-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem 1rem;
    margin-block-end: 1rem;
    padding: 0.55rem 0.85rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
  }

  .breadcrumb-trail {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding-block: 0.52rem;
    padding-inline: 0.95rem;
    font-size: 0.92rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    min-block-size: 44px;
    text-decoration: none;
    transition: background-color 0.15s ease, border-color 0.15s ease;
  }

  .btn-primary {
    background: var(--brand-primary);
    color: #ffffff;
  }
  .btn-primary:hover:not(:disabled) {
    background: var(--brand-primary-hover);
  }

  .btn-secondary {
    background: var(--bg-subtle);
    color: var(--text-main);
    border-color: var(--border-strong);
  }
  .btn-secondary:hover:not(:disabled) {
    background: var(--bg-elevated);
    border-color: var(--brand-primary);
  }

  .btn-outline-light {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.35);
    min-block-size: 40px;
    padding-block: 0.35rem;
    padding-inline: 0.65rem;
    font-size: 0.83rem;
  }
  .btn-outline-light:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.22);
  }

  .btn-sm {
    min-block-size: 36px;
    padding-block: 0.3rem;
    padding-inline: 0.65rem;
    font-size: 0.84rem;
  }

  /* Cards & Grids */
  .section-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: clamp(1rem, 2vw, 1.5rem);
    margin-block-end: 1.25rem;
    box-shadow: var(--shadow-sm);
  }

  .action-grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-block-end: 1.5rem;
  }

  .action-card {
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.15rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 0.75rem;
    transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
    text-align: start;
  }

  .action-card:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-md);
  }

  .systems-grid-5 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
    margin-block: 1rem;
  }

  .system-entry-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-inline-start: 5px solid var(--brand-primary);
    border-radius: var(--radius-md);
    padding: 1.1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 0.75rem;
    box-shadow: var(--shadow-sm);
  }

  /* Semantic Callout Boxes */
  .operator-box {
    background: var(--operator-bg);
    border: 1px solid #86efac;
    border-inline-start: 5px solid var(--operator-border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.15rem;
    margin-block: 0.85rem;
  }

  .warning-box {
    background: var(--warning-bg);
    border: 1px solid #fcd34d;
    border-inline-start: 5px solid var(--warning-border);
    border-radius: var(--radius-sm);
    padding: 0.9rem 1.1rem;
    margin-block: 0.85rem;
    color: var(--warning-text);
  }

  .loto-box {
    background: var(--danger-bg);
    border: 1px solid #fca5a5;
    border-inline-start: 5px solid var(--danger-border);
    border-radius: var(--radius-sm);
    padding: 0.9rem 1.1rem;
    margin-block: 0.85rem;
    color: var(--danger-text);
  }

  .engineer-layer {
    background: var(--engineer-bg);
    border: 1px solid #bfdbfe;
    border-inline-start: 5px solid var(--engineer-border);
    border-radius: var(--radius-sm);
    padding: 0.85rem 1.1rem;
    margin-block: 0.85rem;
  }

  .engineer-layer > summary {
    cursor: pointer;
    font-weight: 700;
    color: var(--engineer-text);
    padding-block: 0.25rem;
    list-style-position: inside;
  }

  .formula-box {
    font-family: var(--font-mono);
    font-size: 0.92rem;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-inline-start: 4px solid var(--brand-accent);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    margin-block: 0.65rem;
    overflow-x: auto;
    direction: ltr;
    text-align: left;
    unicode-bidi: isolate;
  }

  .source-stamp {
    font-size: 0.86rem;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.75rem 0.95rem;
    margin-block-start: 0.75rem;
  }

  /* LTR Math & Code Isolation for RTL Hebrew compatibility */
  .ltr-math, .ltr-num, .ltr-code {
    direction: ltr;
    unicode-bidi: isolate;
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.93em;
  }

  /* Optional Secondary Term Badge */
  .sec-term {
    display: none;
    font-size: 0.85em;
    color: var(--text-muted);
    font-weight: 500;
    margin-inline-start: 0.3rem;
    padding-inline: 0.35rem;
    background: var(--bg-subtle);
    border-radius: 4px;
    border: 1px solid var(--border-color);
  }

  body[data-show-secondary-terms="true"] .sec-term {
    display: inline-block;
  }

  /* Badges */
  .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-block-end: 0.65rem;
  }

  .badge {
    display: inline-flex;
    align-items: center;
    padding-block: 0.2rem;
    padding-inline: 0.6rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    border: 1px solid transparent;
  }

  .badge-operator { background: #dcfce7; color: #166534; border-color: #86efac; }
  .badge-engineer { background: #dbeafe; color: #1e40af; border-color: #93c5fd; }
  .badge-loto { background: #fee2e2; color: #991b1b; border-color: #fca5a5; }
  .badge-training { background: #fef3c7; color: #92400e; border-color: #fde68a; }

  /* Interactive Diagram Component */
  .diagram-workbench {
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: #ffffff;
    overflow: hidden;
    margin-block: 1rem;
  }

  .diagram-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 0.9rem;
    background: var(--bg-subtle);
    border-block-end: 1px solid var(--border-color);
  }

  .diagram-viewport {
    position: relative;
    overflow: auto;
    padding: 0.75rem;
    background: #f8fafc;
    max-block-size: 72dvh;
    text-align: center;
  }

  .diagram-zoom-inner {
    transform-origin: top center;
    transition: transform 0.15s ease;
    display: inline-block;
    inline-size: 100%;
    max-inline-size: 1150px;
  }

  /* Interactive node hotspots in SVG / schematic */
  .interactive-nodes-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    padding: 0.75rem 0.9rem;
    background: #f1f5f9;
    border-block-start: 1px solid var(--border-color);
  }

  .node-hotspot-btn {
    background: #ffffff;
    color: var(--text-main);
    border: 1.5px solid var(--brand-primary);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.7rem;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    min-block-size: 40px;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: background-color 0.12s ease, transform 0.1s ease;
  }

  .node-hotspot-btn:hover,
  .node-hotspot-btn[aria-expanded="true"] {
    background: var(--brand-primary);
    color: #ffffff;
  }

  .node-inspector-card {
    background: var(--bg-elevated);
    border-block-start: 2px solid var(--brand-accent);
    padding: 1rem 1.15rem;
  }

  .diagram-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    padding: 0.6rem 0.9rem;
    font-size: 0.83rem;
    background: #ffffff;
    border-block-start: 1px solid var(--border-color);
  }

  .legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
  }

  .legend-swatch {
    inline-size: 10px;
    block-size: 10px;
    border-radius: 50%;
    flex-shrink: 0;
    display: inline-block;
  }

  /* Responsive Tables per modern-web-guidance */
  .table-wrapper {
    overflow: auto;
    max-inline-size: 100%;
    max-block-size: min(560px, 80vh);
    container-type: inline-size;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-block: 0.75rem;
    background: var(--bg-surface);
  }

  .table-wrapper table {
    inline-size: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.9rem;
  }

  .table-wrapper thead {
    position: sticky;
    inset-block-start: 0;
    z-index: 2;
    background: #e2e8f0;
  }

  .table-wrapper th,
  .table-wrapper td {
    padding: 0.6rem 0.75rem;
    border-block-end: 1px solid var(--border-color);
    border-inline-end: 1px solid var(--border-color);
    text-align: start;
    vertical-align: top;
  }

  .table-wrapper tbody th {
    position: sticky;
    inset-inline-start: 0;
    z-index: 1;
    background: #f8fafc;
    font-weight: 700;
  }

  @container (width < 600px) {
    .table-wrapper table,
    .table-wrapper thead,
    .table-wrapper tbody,
    .table-wrapper tr,
    .table-wrapper th,
    .table-wrapper td {
      display: block;
    }

    .table-wrapper thead {
      display: none;
    }

    .table-wrapper tr {
      margin-block-end: 0.85rem;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .table-wrapper tbody th {
      position: sticky;
      inset-block-start: 0;
      background: #e2e8f0;
      border-block-end: 1px solid var(--border-strong);
    }

    .table-wrapper td::before {
      content: attr(data-label) ": ";
      font-weight: 700;
      color: var(--text-secondary);
      display: inline;
    }
  }

  /* Interactive 6-Step Trainer */
  .trainer-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.25rem;
    align-items: start;
  }

  @media (max-width: 900px) {
    .trainer-layout {
      grid-template-columns: 1fr;
    }
  }

  .trainer-sidebar {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.85rem;
  }

  .case-nav-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    inline-size: 100%;
    text-align: start;
    padding: 0.55rem 0.7rem;
    margin-block-end: 0.35rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-subtle);
    cursor: pointer;
    font-size: 0.86rem;
    font-weight: 600;
  }

  .case-nav-btn[aria-current="true"] {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }

  .trainer-step-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.1rem 1.25rem;
    margin-block-end: 1rem;
  }

  .quiz-option-label {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.65rem 0.8rem;
    margin-block-end: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-subtle);
    cursor: pointer;
  }

  .quiz-option-label:has(:checked) {
    background: var(--bg-elevated);
    border-color: var(--brand-primary);
    font-weight: 600;
  }

  .quiz-feedback {
    margin-block-start: 0.75rem;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
  }

  .quiz-feedback.correct {
    background: #dcfce7;
    border: 1px solid #22c55e;
    color: #14532d;
  }

  .quiz-feedback.partial {
    background: #fef3c7;
    border: 1px solid #f59e0b;
    color: #78350f;
  }

  .quiz-feedback.incorrect {
    background: #fee2e2;
    border: 1px solid #ef4444;
    color: #7f1d1d;
  }

  /* Forms & Calculators per modern-web-guidance */
  .calc-tabs-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-block-end: 1rem;
  }

  .calc-tab-btn {
    padding: 0.55rem 0.95rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: var(--bg-subtle);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    min-block-size: 44px;
  }

  .calc-tab-btn[aria-selected="true"] {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }

  .calc-panel {
    display: none;
  }

  .calc-panel.active {
    display: block;
  }

  .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.9rem;
    margin-block: 0.85rem;
  }

  .field {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .field label {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-main);
  }

  .field .hint {
    font-size: 0.78rem;
    color: var(--text-muted);
  }

  .field input,
  .field select {
    inline-size: 100%;
    max-inline-size: 100%;
    min-inline-size: 0;
    font-size: 1rem;
    padding: 0.55rem 0.7rem;
    min-block-size: 48px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: #ffffff;
  }

  @media (pointer: coarse) {
    .field input,
    .field select,
    .btn {
      min-block-size: 50px;
    }
  }

  .calc-output {
    background: #f8fafc;
    border: 2px solid var(--brand-primary);
    border-radius: var(--radius-md);
    padding: 1rem 1.2rem;
    margin-block-start: 1rem;
  }

  .calc-output.has-error {
    background: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger-text);
  }

  /* Shift Log Sheet */
  .shift-log-print-area {
    background: #ffffff;
    border: 2px solid var(--brand-primary);
    border-radius: var(--radius-md);
    padding: 1.1rem;
    margin-block: 1rem;
  }

  .shift-log-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1.35rem;
    font-size: 0.88rem;
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.85rem;
    margin-block: 0.65rem;
  }

  .log-cell-input,
  .shift-cell-input {
    inline-size: 100%;
    min-inline-size: 48px;
    border: 1px dashed var(--border-strong);
    border-radius: 4px;
    padding: 0.2rem 0.35rem;
    font-size: 0.82rem;
    background: #fffef7;
  }

  /* Secondary term visibility */
  .sec-term {
    display: inline-block;
  }
  body.hide-sec-terms .sec-term {
    display: none !important;
  }

  /* Home Dashboard: 4 Actions + 5 Systems */
  .home-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(225px, 1fr));
    gap: 0.85rem;
    margin-block-end: 1.2rem;
  }
  .home-action-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1rem 1.1rem;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--border-strong);
    background: var(--bg-surface);
    text-decoration: none;
    color: var(--text-main);
    transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
  }
  .home-action-card:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }
  .home-action-icon {
    font-size: 1.65rem;
    margin-block-end: 0.35rem;
  }
  .home-action-card h3 {
    margin: 0 0 0.35rem;
    font-size: 1.02rem;
    color: var(--brand-primary);
  }
  .home-action-card p {
    margin: 0 0 0.65rem;
    font-size: 0.86rem;
    color: var(--text-secondary);
  }
  .home-action-cta {
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--brand-accent);
  }
  .home-systems-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-block: 0.85rem 0.65rem;
  }
  .trainer-progress-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.28rem 0.7rem;
    border-radius: 999px;
    background: #dbeafe;
    color: #1e40af;
    font-weight: 700;
    font-size: 0.82rem;
  }
  .home-systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.85rem;
  }
  .home-system-card {
    background: var(--bg-surface);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.95rem 1.05rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  .home-system-card.active {
    border-color: var(--brand-primary);
    background: #f8fafc;
  }
  .home-system-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.4rem;
    margin-block-end: 0.35rem;
  }
  .home-system-badge {
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--brand-primary);
  }
  .home-system-card h4 {
    margin: 0 0 0.35rem;
    font-size: 0.98rem;
  }
  .home-system-card p {
    margin: 0 0 0.7rem;
    font-size: 0.84rem;
    color: var(--text-secondary);
  }
  .home-system-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  /* System Selector Bar & Interactive Diagram Pins */
  .system-selector-bar {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.5rem;
    margin-block-end: 1rem;
    overflow-x: auto;
    max-inline-size: 100%;
    padding-block-end: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .system-selector-bar::-webkit-scrollbar {
    display: none;
  }
  .system-tab-btn {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 0.5rem 0.95rem;
    border-radius: 999px;
    border: 1.5px solid var(--border-strong);
    background: var(--bg-surface);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    min-block-size: 44px;
  }
  .system-tab-btn.active {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }
  .system-article-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-block-end: 0.85rem;
    border-block-end: 1px solid var(--border-color);
    padding-block-end: 0.65rem;
  }
  .system-quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
  }
  .interactive-diagram-card {
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: #ffffff;
    padding: 0.85rem;
    margin-block: 1rem;
  }
  .diagram-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
  }
  .diagram-canvas-inner {
    position: relative;
    margin-inline: auto;
    transition: width 0.15s ease;
    aspect-ratio: 1600 / 960;
    direction: ltr;
  }
  .diagram-svg-img {
    display: block;
    inline-size: 100%;
    block-size: 100%;
    object-fit: contain;
    border-radius: 6px;
  }
  .diagram-hotspots-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    direction: ltr;
  }
  .diagram-node-pin {
    position: absolute;
    transform: translate(-50%, -50%);
    pointer-events: auto;
    inline-size: 44px;
    block-size: 44px;
    min-inline-size: 44px;
    min-block-size: 44px;
    padding: 0;
    border: none;
    background: transparent;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
  }
  .diagram-node-pin > span {
    inline-size: 28px;
    block-size: 28px;
    border-radius: 999px;
    border: 2px solid #ffffff;
    background: #1d4ed8;
    color: #ffffff;
    font-weight: 800;
    font-size: 0.78rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.38);
    transition: transform 0.12s ease, background-color 0.12s ease;
  }
  .diagram-node-pin:hover > span,
  .diagram-node-pin:focus-visible > span {
    background: #dc2626;
    transform: scale(1.18);
  }
  .diagram-node-pin:focus-visible > span {
    outline: 3px solid var(--brand-accent);
    outline-offset: 2px;
  }
  .diagram-nodes-seq-box {
    margin-block-start: 0.85rem;
    padding: 0.75rem;
    background: var(--bg-subtle);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
  }
  .diagram-nodes-seq-box h4 {
    margin: 0 0 0.5rem;
    font-size: 0.9rem;
  }
  .diagram-nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 0.4rem;
  }
  .diagram-node-list-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-align: start;
    padding: 0.48rem 0.65rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: #ffffff;
    cursor: pointer;
    font-size: 0.84rem;
    font-weight: 600;
    min-block-size: 44px;
    min-inline-size: 44px;
  }
  .diagram-node-list-btn:hover {
    border-color: var(--brand-primary);
    background: #eff6ff;
  }
  .node-badge-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-inline-size: 24px;
    block-size: 24px;
    border-radius: 999px;
    background: var(--brand-primary);
    color: #ffffff;
    font-size: 0.78rem;
    font-weight: 800;
    flex-shrink: 0;
  }
  .node-modal-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-block-end: 0.75rem;
    border-block-end: 1px solid var(--border-color);
    padding-block-end: 0.5rem;
  }
  .node-modal-header h3 {
    margin: 0;
    font-size: 1.05rem;
  }
  .node-modal-grid {
    display: grid;
    gap: 0.6rem;
    margin-block-end: 0.85rem;
  }
  .node-field-box {
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
  }
  .node-field-box p {
    margin: 0.25rem 0 0;
    font-size: 0.9rem;
  }
  .node-safety-box {
    background: #fef2f2;
    border-color: #fca5a5;
  }
  .node-modal-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: flex-end;
  }

  /* 6-Step Trainer Styles */
  .trainer-header-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    margin-block-end: 0.75rem;
  }
  .trainer-cases-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-block-end: 1rem;
  }
  .trainer-case-pill {
    padding: 0.45rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-strong);
    background: var(--bg-surface);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    min-block-size: 40px;
  }
  .trainer-case-pill.active {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }
  .trainer-case-pill.completed:not(.active) {
    background: #dcfce7;
    border-color: #22c55e;
    color: #166534;
  }
  .trainer-active-card {
    border: 1.5px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    padding: 1rem 1.15rem;
  }
  .trainer-case-title-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-block-end: 0.75rem;
  }
  .trainer-steps-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-block-end: 0.9rem;
    padding-block-end: 0.65rem;
    border-block-end: 1px solid var(--border-color);
  }
  .trainer-step-dot {
    padding: 0.38rem 0.7rem;
    border-radius: 999px;
    border: 1px solid var(--border-strong);
    background: var(--bg-subtle);
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
  }
  .trainer-step-dot.current {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }
  .trainer-step-dot.done:not(.current) {
    background: #dcfce7;
    border-color: #22c55e;
    color: #166534;
  }
  .trainer-options-list {
    display: grid;
    gap: 0.5rem;
    margin-block: 0.75rem;
  }
  .trainer-option-card {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-color);
    background: var(--bg-subtle);
    cursor: pointer;
  }
  .trainer-option-card.selected {
    border-color: var(--brand-primary);
    background: #eff6ff;
  }
  .trainer-option-card.opt-correct {
    border-color: #16a34a;
    background: #dcfce7;
  }
  .trainer-option-card.opt-wrong {
    border-color: #dc2626;
    background: #fee2e2;
  }
  .trainer-hint-box {
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    background: #fef9c3;
    border: 1px solid #facc15;
    margin-block: 0.65rem;
    font-size: 0.9rem;
  }
  .trainer-feedback-box {
    padding: 0.75rem 0.95rem;
    border-radius: var(--radius-sm);
    margin-block: 0.65rem;
  }
  .trainer-feedback-box.feedback-ok {
    background: #dcfce7;
    border: 1.5px solid #16a34a;
    color: #14532d;
  }
  .trainer-feedback-box.feedback-err {
    background: #fee2e2;
    border: 1.5px solid #dc2626;
    color: #7f1d1d;
  }
  .trainer-step-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-block-start: 0.85rem;
  }
  .trainer-conclusions-box,
  .trainer-loto-split {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 0.65rem;
    margin-block-end: 0.75rem;
  }
  .trainer-conclusions-box > div,
  .operator-safe-card,
  .loto-req-card {
    padding: 0.65rem 0.8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-subtle);
    font-size: 0.88rem;
  }

  /* Calculation Card & Metadata */
  .calc-meta-box {
    padding: 0.75rem 0.9rem;
    border-radius: var(--radius-sm);
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    margin-block-end: 0.8rem;
    font-size: 0.86rem;
  }
  .calc-meta-grid {
    display: grid;
    gap: 0.3rem;
    margin-block-start: 0.35rem;
  }
  .calc-card-wrapper {
    display: grid;
    gap: 0.55rem;
  }
  .calc-card-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    padding-block-end: 0.4rem;
    border-block-end: 1px solid var(--border-color);
  }
  .calc-card-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
  }
  .calc-card-footer-details {
    font-size: 0.82rem;
    color: var(--text-secondary);
    padding-block-start: 0.4rem;
    border-block-start: 1px dashed var(--border-color);
  }
  .calc-card-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-block-start: 0.35rem;
  }

  /* Shift Logs Selector & Layout */
  .shift-log-selector-row,
  .shift-log-actions-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-block: 0.55rem;
  }
  .shift-log-tab-btn {
    padding: 0.45rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border-strong);
    background: var(--bg-surface);
    font-weight: 700;
    font-size: 0.84rem;
    cursor: pointer;
  }
  .shift-log-tab-btn.active {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }
  .shift-log-sheet-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-block-end: 0.6rem;
  }
  .shift-log-meta-fields {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    font-size: 0.84rem;
  }
  .shift-meta-input {
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    padding: 0.2rem 0.4rem;
    font-size: 0.84rem;
    max-inline-size: 130px;
  }
  .shift-log-signatures {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    margin-block-start: 0.55rem;
    font-weight: 700;
    font-size: 0.85rem;
  }
  .system-cases-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.75rem;
  }
  .case-preview-card {
    padding: 0.85rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: var(--bg-subtle);
  }
  .case-preview-top {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 700;
    margin-block-end: 0.35rem;
  }
  .search-group-block {
    margin-block-top: 0.65rem;
  }
  .search-group-header {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--primary, #0f4c81);
    padding: 0.15rem 0.25rem;
    margin-block-end: 0.2rem;
    border-block-end: 1px solid rgba(15, 76, 129, 0.15);
  }
  .search-preview-item {
    display: block;
    padding: 0.45rem 0.65rem;
    margin-block-top: 0.3rem;
    border-radius: 6px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.84rem;
    transition: background-color 0.12s ease, border-color 0.12s ease;
  }
  .search-preview-item:hover,
  .search-preview-item.active-search-item,
  .search-preview-item:focus-visible {
    background: #eff6ff;
    border-color: var(--primary, #0f4c81);
  }
  .search-preview-item:focus-visible {
    outline: 3px solid var(--brand-accent);
    outline-offset: 2px;
  }
  .search-preview-item span,
  .search-item-snippet {
    display: block;
    color: var(--text-muted);
    font-size: 0.78rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-block-start: 0.12rem;
  }
  .search-preview-item mark {
    background: #fef08a;
    color: #0f172a;
    padding: 0 2px;
    border-radius: 2px;
    font-weight: 600;
  }
  .search-empty-state {
    padding: 0.75rem;
    margin-block-top: 0.4rem;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
  }
  .search-empty-title {
    margin: 0;
    font-size: 0.92rem;
    color: var(--text-main);
  }
  .search-empty-suggestions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.84rem;
  }
  .search-empty-hints-label {
    color: var(--text-muted);
  }
  .search-empty-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  /* v10: Calculator Grid, Engine Warnings Stack & Inline Field Validation */
  .calc-grid,
  .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
    gap: 0.9rem;
    margin-block: 0.85rem;
  }

  .calc-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-block-end: 1rem;
  }

  .calc-warnings-stack {
    display: grid;
    gap: 0.45rem;
    margin-block: 0.55rem;
  }

  .calc-warning-item {
    display: block;
    padding: 0.6rem 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    line-height: 1.5;
  }

  .calc-warning-warn,
  .calc-warning-item.is-notice {
    background: #fffbeb;
    border: 1px solid #f59e0b;
    border-inline-start: 4px solid #d97706;
    color: #78350f;
  }

  .calc-warning-danger,
  .calc-warning-item.is-danger {
    background: #fef2f2;
    border: 1px solid #ef4444;
    border-inline-start: 4px solid #dc2626;
    color: #7f1d1d;
  }

  .calc-warning-info,
  .calc-warning-item.is-info {
    background: #eff6ff;
    border: 1px solid #93c5fd;
    border-inline-start: 4px solid #2563eb;
    color: #1e3a8a;
  }

  .calc-field-inline-error {
    margin-block-start: 0.25rem;
    padding: 0.4rem 0.6rem;
    border-radius: 5px;
    background: #fef2f2;
    border: 1px solid #ef4444;
    border-inline-start: 4px solid #dc2626;
    color: #991b1b;
    font-size: 0.83rem;
    font-weight: 600;
    line-height: 1.38;
  }

  .field input.input-error-highlight,
  .field select.input-error-highlight {
    border: 2px solid #dc2626 !important;
    background-color: #fff5f5 !important;
  }

  /* v10: Storage Fallback Banner & Project Metadata Disclaimer Card */
  .storage-fallback-banner {
    background: #fffbeb;
    border: 1.5px solid #f59e0b;
    border-inline-start: 5px solid #d97706;
    color: #78350f;
    border-radius: var(--radius-sm);
    padding: 0.65rem 0.95rem;
    margin-block-end: 0.9rem;
    font-size: 0.88rem;
  }

  .metadata-disclaimer-card {
    margin-block-start: 1.15rem;
    padding: 0.95rem 1.15rem;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--border-strong);
    background: #f8fafc;
    font-size: 0.86rem;
  }

  .metadata-disclaimer-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-block-end: 0.5rem;
    padding-block-end: 0.4rem;
    border-block-end: 1px solid var(--border-color);
  }

  .metadata-disclaimer-header .badge-sub {
    background: #dbeafe;
    color: #1e3a8a;
    border-color: #93c5fd;
  }

  .metadata-disclaimer-list {
    margin: 0;
    padding-inline-start: 1.2rem;
    display: grid;
    gap: 0.3rem;
    color: var(--text-secondary);
  }

  /* v10: Universal Tap Targets >= 44x44px & Scroll Margin */
  [id] {
    scroll-margin-block-start: 6.5rem;
  }

  .app-shell {
    max-inline-size: 1440px;
    margin-inline: auto;
    padding-block: 1rem 2rem;
    padding-inline: clamp(0.65rem, 2vw, 1.5rem);
  }

  .site-footer {
    text-align: center;
    padding: 1.1rem 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-block-start: 1px solid var(--border-color);
    background: var(--bg-surface);
  }

  .lang-btn,
  .term-toggle-btn,
  .site-header .btn-print,
  .nav-pill,
  .btn,
  .btn-sm,
  .system-tab-btn,
  .calc-tab-btn,
  .shift-log-tab-btn,
  .trainer-case-pill,
  .trainer-step-dot,
  .diagram-node-list-btn,
  .trainer-option-card {
    min-block-size: 44px;
    min-inline-size: 44px;
    display: inline-flex;
    align-items: center;
  }

  .diagram-node-list-btn,
  .trainer-option-card {
    display: flex;
  }

  /* v10 & v13: Mobile-First Ergonomics (< 768px: Top Bar + Fixed Bottom Nav) */
  @media (max-width: 767.98px) {
    #desktop-main-nav {
      display: none !important;
    }

    .mobile-bottom-nav {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      position: fixed;
      inset-block-end: 0;
      inset-inline: 0;
      z-index: 150;
      background: #ffffff;
      border-block-start: 1px solid #cbd5e1;
      box-shadow: 0 -2px 10px rgba(15, 23, 42, 0.08);
      padding-block: 4px env(safe-area-inset-bottom, 4px);
      padding-inline: 4px;
    }

    .mobile-nav-btn {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2px;
      min-block-size: 50px;
      min-inline-size: 44px;
      padding: 4px 2px;
      border-radius: 6px;
      color: #475569;
      text-decoration: none;
      font-size: 0.72rem;
      font-weight: 600;
      line-height: 1.15;
      text-align: center;
      transition: background-color 0.12s ease, color 0.12s ease;
    }

    .mobile-nav-btn:hover {
      background: #f1f5f9;
      color: #0f172a;
    }

    .mobile-nav-btn.active {
      color: #0f4c81;
      background: #ebf3fa;
      font-weight: 700;
    }

    .app-shell {
      padding-block-end: 5.5rem;
    }

    .site-footer {
      padding-block-end: 5.5rem;
    }
  }

  @media (max-width: 768px) {
    [id] {
      scroll-margin-block-start: 1rem;
    }

    .site-header {
      position: relative;
    }

    .site-subtitle {
      font-size: 0.76rem;
      line-height: 1.35;
    }

    .search-box {
      flex: 1 1 100%;
      inline-size: 100%;
    }

    .search-box #global-search {
      inline-size: 100%;
      min-inline-size: 0;
      min-block-size: 44px;
      font-size: 1rem;
    }

    .section-card {
      padding: 0.85rem 0.75rem;
    }

    .interactive-diagram-card {
      padding: 0.6rem;
    }

    .diagram-viewport {
      padding: 0.25rem;
    }

    .diagram-node-pin > span {
      inline-size: 22px;
      block-size: 22px;
      font-size: 0.7rem;
      border-width: 1.5px;
    }

    .diagram-nodes-grid {
      grid-template-columns: 1fr;
    }

    .home-actions-grid,
    .home-systems-grid,
    .system-cases-preview-grid {
      grid-template-columns: 1fr;
    }

    .formula-box,
    code {
      max-inline-size: 100%;
      overflow-x: auto;
      word-break: break-word;
    }

    .unit-switch-bar {
      padding: 0.55rem 0.65rem;
      gap: 0.45rem;
    }

    .unit-switch-btns {
      inline-size: 100%;
    }

    .unit-switch-btn {
      flex: 1 1 auto;
      justify-content: center;
      font-size: 0.85rem;
      padding: 0.45rem 0.6rem;
    }
  }

  /* v11 Calculator Unit Switcher (Metric SI <-> Imperial US) & Dual-Unit Secondary Display */
  .unit-switch-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.65rem 0.95rem;
    margin-block-end: 0.85rem;
    background: #eff6ff;
    border: 1.5px solid #93c5fd;
    border-radius: var(--radius-sm, 6px);
  }

  .unit-switch-label {
    font-weight: 700;
    font-size: 0.94rem;
    color: #1e3a8a;
  }

  .unit-switch-btns {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.45rem;
  }

  .unit-switch-btn {
    min-block-size: 44px;
    min-inline-size: 44px;
    padding: 0.5rem 0.9rem;
    font-size: 0.88rem;
    font-weight: 700;
    border: 1.5px solid #3b82f6;
    border-radius: 6px;
    background: #ffffff;
    color: #1e3a8a;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: background-color 0.12s ease, color 0.12s ease, box-shadow 0.12s ease;
  }

  .unit-switch-btn:hover {
    background: #dbeafe;
  }

  .unit-switch-btn.active,
  .unit-switch-btn[aria-pressed="true"] {
    background: #1d4ed8;
    color: #ffffff;
    border-color: #1e40af;
    box-shadow: 0 1px 3px rgba(29, 78, 216, 0.25);
  }

  .unit-secondary {
    font-size: 0.86em;
    color: #64748b;
    font-weight: 400;
  }

  /* v13 Stage 1: Single Active View & Tool Subviews */
  .app-view:not(.active-view) {
    display: none !important;
  }

  .tool-subview:not(.active-tool-subview) {
    display: none !important;
  }

  .system-article:not(.active-system-article) {
    display: none !important;
  }

  body[data-print-mode="survey"] #view-tools,
  body[data-print-mode="survey"] #sec-survey {
    display: block !important;
  }

  .tools-subnav-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-block-end: 1rem;
    padding: 0.65rem 0.85rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
  }

  .tools-subnav-btn {
    min-block-size: 44px;
    min-inline-size: 44px;
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: var(--bg-subtle);
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
  }

  .tools-subnav-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--brand-primary);
  }

  .tools-subnav-btn.active,
  .tools-subnav-btn[aria-selected="true"] {
    background: var(--brand-primary);
    color: #ffffff;
    border-color: var(--brand-primary);
  }

  /* v13 Stage 3 & Stage 7: Home Entrance (#home) & First-Visit Banner */
  .home-v13-wrapper {
    max-inline-size: 1200px;
    margin-inline: auto;
    padding-block: 16px 40px;
    display: flex;
    flex-direction: column;
    gap: 40px;
  }

  .first-visit-banner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px 16px;
    padding: 10px 16px;
    border-radius: 10px;
    background: #eff6ff;
    border: 1px solid #93c5fd;
    color: #0f172a;
    font-size: 0.9rem;
  }

  .first-visit-items {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 12px;
  }

  .first-visit-sep {
    color: #64748b;
    font-weight: 700;
  }

  @media (max-width: 767px) {
    .first-visit-items {
      flex-direction: column;
      align-items: flex-start;
      gap: 4px;
    }
    .first-visit-sep {
      display: none !important;
    }
  }

  .legacy-anchor-target {
    display: block;
    block-size: 1px;
    inline-size: 1px;
    overflow: hidden;
  }

  .first-visit-dismiss-btn {
    min-block-size: 44px;
    min-inline-size: 44px;
    padding-inline: 16px;
    font-weight: 700;
  }

  .home-v13-hero {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .home-v13-hero-head {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-inline-size: 760px;
  }

  .home-v13-overline {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #0369a1;
  }

  .home-v13-h1 {
    margin: 0;
    font-size: clamp(1.75rem, 3.4vw, 2.5rem);
    line-height: 1.12;
    font-weight: 800;
    color: #0f172a;
  }

  .home-v13-lead {
    margin: 0;
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    line-height: 1.48;
    color: #334155;
  }

  .home-continue-row {
    display: flex;
  }

  .home-continue-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-block-size: 44px;
    padding: 8px 16px;
    border-radius: 999px;
    background: #fef3c7;
    border: 1px solid #f59e0b;
    color: #78350f;
    font-size: 0.92rem;
    font-weight: 700;
    text-decoration: none;
    transition: background-color 0.12s ease;
  }

  .home-continue-pill:hover {
    background: #fde68a;
    color: #451a03;
  }

  .home-v13-doors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(265px, 1fr));
    gap: 18px;
  }

  .home-v13-door {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 22px 24px;
    border-radius: 16px;
    background: #ffffff;
    color: #0f172a;
    text-decoration: none;
    border: 1px solid #cbd5e1;
    transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
  }

  .home-v13-door:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: #0f4c81;
  }

  .home-v13-door-primary {
    background: #0f4c81;
    color: #ffffff;
    border-color: #0f4c81;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.18);
  }

  .home-v13-door-primary:hover {
    background: #0b3960;
    color: #ffffff;
    border-color: #0b3960;
  }

  .home-v13-door-icon {
    inline-size: 48px;
    block-size: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .home-v13-door-icon-primary {
    background: rgba(255, 255, 255, 0.16);
  }

  .home-v13-door-title {
    font-size: clamp(1.2rem, 1.8vw, 1.45rem);
    font-weight: 700;
    line-height: 1.22;
  }

  .home-v13-door-desc {
    font-size: 0.96rem;
    line-height: 1.48;
    color: #334155;
  }

  .home-v13-door-primary .home-v13-door-desc {
    color: #dbeafe;
  }

  .home-v13-door-cta {
    margin-block-start: auto;
    font-size: 0.98rem;
    font-weight: 700;
  }

  .home-v13-example-card {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 16px;
    padding: clamp(18px, 3vw, 30px);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    align-items: center;
  }

  .home-v13-example-left {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .home-v13-example-badge {
    align-self: flex-start;
    font-size: 0.82rem;
    font-weight: 700;
    padding: 6px 10px;
    border-radius: 999px;
    background: #fef3c7;
    color: #78350f;
  }

  .home-v13-example-h2 {
    margin: 0;
    font-size: clamp(1.3rem, 2.2vw, 1.7rem);
    line-height: 1.22;
    color: #0f172a;
  }

  .home-v13-example-desc {
    margin: 0;
    font-size: 0.98rem;
    line-height: 1.55;
    color: #334155;
  }

  .home-v13-example-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-block-start: 6px;
  }

  .home-v13-ex-btn-primary,
  .home-v13-ex-btn-outline {
    min-block-size: 48px;
    padding-inline: 20px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.98rem;
    text-decoration: none;
  }

  .home-v13-example-tiles {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .home-v13-ex-tile {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .home-v13-ex-tile-label {
    font-size: 0.82rem;
    color: #475569;
    font-weight: 600;
  }

  .home-v13-ex-tile-val {
    font-size: clamp(1.35rem, 2.2vw, 1.8rem);
    font-weight: 800;
    line-height: 1.15;
  }

  .home-v13-ex-tile-note {
    font-size: 0.8rem;
    line-height: 1.35;
    color: #475569;
  }

  .home-v13-systems-sec {
    display: flex;
    flex-direction: column;
    gap: 18px;
  }

  .home-v13-systems-head {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-end;
    gap: 12px;
  }

  .home-v13-sec-h2 {
    margin: 0;
    font-size: clamp(1.35rem, 2.2vw, 1.7rem);
    color: #0f172a;
  }

  .home-v13-progress-text {
    font-size: 0.94rem;
    color: #475569;
    font-weight: 600;
  }

  .home-v13-systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 14px;
  }

  .home-v13-sys-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px;
    border-radius: 14px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: #0f172a;
    text-decoration: none;
    transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
  }

  .home-v13-sys-card:hover {
    transform: translateY(-2px);
    border-color: #0f4c81;
    box-shadow: var(--shadow-sm);
  }

  .home-v13-sys-icon {
    inline-size: 44px;
    block-size: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .home-v13-sys-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #0f172a;
  }

  .home-v13-sys-desc {
    font-size: 0.88rem;
    line-height: 1.48;
    color: #475569;
  }

  .home-v13-sys-counts {
    margin-block-start: auto;
    font-size: 0.88rem;
    color: #0f4c81;
    font-weight: 600;
  }

  .home-v13-tools-sec {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .home-v13-tools-h2 {
    margin: 0;
    font-size: 1.35rem;
    color: #0f172a;
  }

  .home-v13-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(235px, 1fr));
    gap: 12px;
  }

  .home-v13-tool-tile {
    display: flex;
    align-items: center;
    gap: 12px;
    min-block-size: 64px;
    padding: 12px 16px;
    border-radius: 12px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: #0f172a;
    text-decoration: none;
    transition: border-color 0.12s ease, background-color 0.12s ease;
  }

  .home-v13-tool-tile:hover {
    border-color: #0f4c81;
    background: #f8fafc;
  }

  .home-v13-tool-svg {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .home-v13-tool-title {
    display: block;
    font-size: 0.98rem;
    color: #0f172a;
  }

  .home-v13-tool-sub {
    display: block;
    font-size: 0.85rem;
    color: #475569;
  }

  .home-v13-footer-note {
    border-block-start: 1px solid #cbd5e1;
    padding-block-start: 18px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    font-size: 0.88rem;
    line-height: 1.5;
    color: #475569;
  }

  .home-v13-footer-note a {
    color: #0f4c81;
    font-weight: 600;
  }

  @media (max-width: 768px) {
    .home-v13-example-tiles {
      grid-template-columns: 1fr;
    }

    .home-v13-doors-grid,
    .home-v13-systems-grid,
    .home-v13-tools-grid {
      grid-template-columns: 1fr;
    }
  }

  /* v13 Stage 4: Problem Symptom Finder Screen (#problem) */
  .problem-v13-wrapper {
    max-inline-size: 1200px;
    margin-inline: auto;
    padding-block: 16px 40px;
    display: flex;
    flex-direction: column;
    gap: 28px;
  }

  .problem-v13-header {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .problem-back-link {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    min-block-size: 44px;
    font-size: 0.94rem;
    font-weight: 600;
    color: #0f4c81;
    text-decoration: none;
  }

  .problem-back-link:hover {
    text-decoration: underline;
  }

  .problem-v13-h1 {
    margin: 0;
    font-size: clamp(1.7rem, 3vw, 2.25rem);
    line-height: 1.15;
    font-weight: 800;
    color: #0f172a;
  }

  .problem-v13-lead {
    margin: 0;
    font-size: clamp(1rem, 1.4vw, 1.125rem);
    color: #334155;
  }

  .problem-step1-sec,
  .problem-step2-sec {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .problem-step-h2 {
    margin: 0;
    font-size: 1.125rem;
    color: #475569;
    font-weight: 600;
  }

  .problem-sys-pills-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }

  .problem-sys-pill {
    min-block-size: 48px;
    padding: 0 20px;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    background: #ffffff;
    color: #0f172a;
    border: 1px solid #94a3b8;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
  }

  .problem-sys-pill:hover {
    border-color: #0f4c81;
    background: #f8fafc;
  }

  .problem-sys-pill.active,
  .problem-sys-pill[aria-pressed="true"] {
    background: #0f4c81;
    color: #ffffff;
    border-color: #0f4c81;
  }

  .problem-sys-pill-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .problem-sys-pill-icon svg {
    inline-size: 18px;
    block-size: 18px;
  }

  .problem-main-split {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    align-items: flex-start;
  }

  .problem-step2-sec {
    flex: 1 1 420px;
    min-inline-size: 0;
  }

  .problem-cards-stack {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .problem-symptom-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    inline-size: 100%;
    text-align: start;
    padding: 18px 20px;
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: #0f172a;
    transition: border-color 0.12s ease, background-color 0.12s ease, box-shadow 0.12s ease;
  }

  .problem-symptom-card:hover {
    border-color: #0f4c81;
    box-shadow: var(--shadow-sm);
  }

  .problem-symptom-card.active,
  .problem-symptom-card[aria-pressed="true"] {
    background: #eff6ff;
    border: 2px solid #0f4c81;
  }

  .problem-card-badge {
    align-self: flex-start;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 999px;
    background: #e2e8f0;
    color: #1e293b;
  }

  .problem-symptom-card.active .problem-card-badge {
    background: #0f4c81;
    color: #ffffff;
  }

  .problem-card-headline {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: #0f172a;
    line-height: 1.3;
  }

  .problem-card-details {
    display: block;
    font-size: 0.94rem;
    line-height: 1.5;
    color: #334155;
  }

  .problem-card-where {
    display: block;
    font-size: 0.82rem;
    color: #475569;
    font-weight: 500;
    padding-block-start: 4px;
    border-block-start: 1px dashed #cbd5e1;
  }

  .problem-missing-symptom-link {
    display: flex;
    align-items: center;
    min-block-size: 56px;
    padding: 10px 18px;
    border-radius: 12px;
    border: 1px dashed #64748b;
    color: #334155;
    text-decoration: none;
    font-size: 0.98rem;
    font-weight: 600;
    background: #ffffff;
    transition: border-color 0.12s ease, color 0.12s ease, background-color 0.12s ease;
  }

  .problem-missing-symptom-link:hover {
    border-color: #0f4c81;
    color: #0f4c81;
    background: #f8fafc;
  }

  .problem-aside-card {
    flex: 1 1 360px;
    min-inline-size: 0;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 16px;
    padding: clamp(20px, 2.5vw, 28px);
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  .problem-aside-badge {
    align-self: flex-start;
    font-size: 0.82rem;
    font-weight: 700;
    padding: 6px 10px;
    border-radius: 999px;
    background: #e0f2fe;
    color: #0c4a6e;
  }

  .problem-aside-h2 {
    margin: 0;
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    line-height: 1.25;
    color: #0f172a;
  }

  .problem-aside-desc {
    margin: 0;
    font-size: 0.94rem;
    line-height: 1.58;
    color: #334155;
  }

  .problem-aside-steps {
    margin: 0;
    padding-inline-start: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.94rem;
    color: #334155;
  }

  .problem-aside-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-block-start: 4px;
  }

  .problem-aside-open-btn {
    min-block-size: 52px;
    border-radius: 10px;
    justify-content: center;
    font-weight: 700;
    font-size: 1.05rem;
    inline-size: 100%;
  }

  .problem-aside-calc-btn {
    min-block-size: 48px;
    border-radius: 10px;
    justify-content: center;
    font-weight: 700;
    font-size: 0.98rem;
    inline-size: 100%;
    border-color: #0f4c81;
    color: #0f4c81;
  }

  .problem-aside-no-calc {
    margin: 0;
    padding: 10px 14px;
    border-radius: 10px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    font-size: 0.88rem;
    line-height: 1.45;
    color: #475569;
  }

  .problem-aside-log-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-block-size: 48px;
    border-radius: 10px;
    color: #334155;
    text-decoration: none;
    font-size: 0.94rem;
    font-weight: 600;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    transition: background-color 0.12s ease, border-color 0.12s ease;
  }

  .problem-aside-log-btn:hover {
    background: #f8fafc;
    border-color: #0f4c81;
    color: #0f4c81;
  }

  /* =======================================================================
   * STAGE 5 (v13): PROGRESSIVE DISCLOSURE (LEARN, CALC OVERVIEW, CASE)
   * ======================================================================= */
  .system-short-summary-box {
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-inline-start: 4px solid #0f4c81;
    border-radius: 12px;
    padding: 14px 18px;
    margin-block: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .system-short-summary-line {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.48;
    color: #1e293b;
  }

  .system-section-details {
    margin-block: 14px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: #ffffff;
    overflow: hidden;
  }

  .system-section-details > summary {
    padding: 14px 18px;
    font-size: 1.02rem;
    font-weight: 700;
    color: #0f172a;
    background: #f8fafc;
    cursor: pointer;
    min-block-size: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    user-select: none;
  }

  .system-section-details > summary:hover {
    background: #f1f5f9;
    color: #0f4c81;
  }

  .system-section-details[open] > summary {
    border-block-end: 1px solid #e2e8f0;
    background: #eff6ff;
    color: #0f4c81;
  }

  .system-section-details > .system-purpose-block,
  .system-section-details > .system-principle-block,
  .system-section-details > .system-table-section {
    padding: 16px 18px;
    margin: 0;
  }

  /* Calculator 10-Module Overview & Single-Module Mode */
  #sec-calculators.calc-in-overview .calc-tabs,
  #sec-calculators.calc-in-overview .calc-panel {
    display: none !important;
  }

  #sec-calculators.calc-single-module-mode .calc-tabs {
    display: none !important;
  }

  .calc-submodule-block.hidden-submodule {
    display: none !important;
  }

  .calc-back-to-overview-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-block: 12px 16px;
    padding: 10px 14px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
  }

  .calc-back-overview-btn {
    min-block-size: 44px;
    font-weight: 700;
  }

  .calc-active-module-badge {
    font-size: 0.95rem;
    font-weight: 700;
    color: #0f4c81;
  }

  .calc-overview-container {
    margin-block-start: 14px;
  }

  .calc-overview-intro {
    margin-block-end: 18px;
    color: #334155;
    font-size: 0.96rem;
  }

  .calc-overview-groups {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .calc-overview-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .calc-overview-group-title {
    margin: 0;
    font-size: 1.12rem;
    font-weight: 800;
    color: #0f172a;
    padding-block-end: 6px;
    border-block-end: 2px solid #e2e8f0;
  }

  .calc-overview-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 14px;
  }

  .calc-overview-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px 18px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 14px;
    text-decoration: none;
    color: #0f172a;
    transition: border-color 0.12s ease, box-shadow 0.12s ease, transform 0.12s ease;
  }

  .calc-overview-card:hover {
    border-color: #0f4c81;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
  }

  .calc-overview-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .calc-overview-code {
    font-size: 0.78rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 999px;
    background: #e0f2fe;
    color: #075985;
  }

  .calc-overview-open-hint {
    font-size: 0.85rem;
    font-weight: 700;
    color: #0f4c81;
  }

  .calc-overview-card-title {
    font-size: 1.02rem;
    font-weight: 700;
    line-height: 1.3;
    color: #0f172a;
  }

  .calc-overview-card-what {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.45;
    color: #334155;
  }

  .calc-overview-card-inputs {
    margin-block-start: auto;
    padding-block-start: 8px;
    border-block-start: 1px dashed #e2e8f0;
    font-size: 0.83rem;
    color: #475569;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .calc-how-it-works-details {
    margin-block-start: 10px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: #f8fafc;
    overflow: hidden;
  }

  .calc-how-it-works-details > summary {
    padding: 10px 14px;
    font-size: 0.9rem;
    font-weight: 700;
    color: #0f4c81;
    cursor: pointer;
    min-block-size: 44px;
    display: flex;
    align-items: center;
    user-select: none;
  }

  .calc-how-it-works-details > summary:hover {
    background: #eff6ff;
  }

  .calc-how-it-works-body,
  .calc-how-it-works-details > .calc-card-footer-details {
    padding: 10px 14px;
    border-block-start: 1px solid #e2e8f0;
    font-size: 0.88rem;
    line-height: 1.48;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  /* Case Trainer Symptom Header & 6-Step Scale */
  .trainer-symptom-header-card {
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    padding: 14px 18px;
    margin-block-end: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .trainer-symptom-badges {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-block-end: 6px;
  }

  .trainer-symptom-summary {
    padding: 10px 14px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-inline-start: 4px solid #f59e0b;
    border-radius: 8px;
    font-size: 0.95rem;
    line-height: 1.45;
    color: #0f172a;
  }

  .trainer-symptom-detail {
    margin-block-start: 4px;
    font-size: 0.88rem;
    color: #475569;
  }

  .trainer-step-dot {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-block-size: 48px;
    padding: 6px 12px;
  }

  .trainer-step-num {
    font-weight: 800;
    font-size: 0.86rem;
  }

  .trainer-step-short {
    font-size: 0.74rem;
    opacity: 0.88;
  }

  /* =========================================================================
     v13 STAGE 6: UNIFIED SVG ICONS, SYSTEM BADGES & EMPTY STATES
     ========================================================================= */
  .system-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }

  .system-tab-svg {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
  }

  .system-tab-svg svg {
    width: 18px;
    height: 18px;
  }

  .system-article-svg-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    flex-shrink: 0;
  }

  .calc-overview-group-title {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .calc-overview-sys-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    flex-shrink: 0;
  }

  .calc-overview-sys-icon svg {
    width: 18px;
    height: 18px;
  }

  .empty-state-card {
    border: 1.5px dashed #94a3b8;
    border-radius: 12px;
    background: #f8fafc;
    padding: var(--space-24, 24px);
    margin-block-end: var(--space-16, 16px);
    text-align: start;
  }

  .empty-state-card h4 {
    margin: 0 0 8px;
    font-size: var(--font-size-card-title, 1.05rem);
    font-weight: 800;
    color: #0f172a;
  }

  .empty-state-card p {
    margin: 0 0 14px;
    font-size: var(--font-size-body, 0.95rem);
    color: #475569;
    line-height: 1.5;
  }

  .empty-state-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  /* =========================================================================
     v13 STAGE 7: HELP `?` BUTTONS & POPOVERS
     ========================================================================= */
  .help-tip-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-inline-size: 44px;
    min-block-size: 44px;
    padding: 0 8px;
    border-radius: 8px;
    border: 1.5px solid #94a3b8;
    background: #ffffff;
    color: #0f4c81;
    font-weight: 800;
    font-size: 0.9rem;
    cursor: pointer;
    flex-shrink: 0;
  }

  .help-tip-btn:hover,
  .help-tip-btn[aria-expanded="true"] {
    background: #e0f2fe;
    border-color: #0f4c81;
  }

  .help-tip-popover {
    flex: 1 1 100%;
    inline-size: 100%;
    padding: 10px 14px;
    border-radius: 8px;
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    color: #0c4a6e;
    font-size: 0.88rem;
    line-height: 1.45;
    margin-block-start: 6px;
  }

  .help-tip-popover[hidden] {
    display: none !important;
  }

  /* =========================================================================
     v14 STAGE 2 & 3: UNIFIED 10-BLOCK TEXTBOOK, SELF-CHECK & 84-TERM GLOSSARY
     ========================================================================= */
  .guide-toc-bar {
    position: sticky;
    /* v14.0.1: отступ = высота липкой шапки (задаёт app.js через --guide-toc-top), на телефоне 0 */
    top: var(--guide-toc-top, 0px);
    z-index: 35;
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    max-inline-size: 100%;
    padding: 8px 10px;
    margin-block: 10px 18px;
    background: rgba(248, 250, 252, 0.96);
    backdrop-filter: blur(6px);
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.06);
  }

  .guide-toc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    white-space: nowrap;
    min-block-size: 38px;
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    color: #1e293b;
    font-size: 0.84rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
  }

  .guide-toc-btn:hover {
    background: #eff6ff;
    border-color: #0f4c81;
    color: #0f4c81;
  }

  .guide-toc-btn.active,
  .guide-toc-btn[aria-current="true"] {
    background: #0f4c81;
    border-color: #0f4c81;
    color: #ffffff;
  }

  .guide-textbook-block {
    /* v14.0.1: при открытии ссылки «с холода» браузер сам прокручивает к блоку —
       отступ = липкая шапка (--guide-toc-top) + оглавление 56 px + 12 px */
    scroll-margin-block-start: calc(var(--guide-toc-top, 0px) + 68px);
    margin-block: 18px;
    padding: clamp(14px, 2vw, 22px);
    border: 1px solid #cbd5e1;
    border-radius: 14px;
    background: #ffffff;
    max-inline-size: 100%;
    min-inline-size: 0;
    overflow-wrap: break-word;
    word-break: break-word;
  }

  .guide-block-h2 {
    margin: 0 0 12px;
    padding-block-end: 8px;
    border-block-end: 2px solid #e2e8f0;
    font-size: clamp(1.08rem, 1.8vw, 1.28rem);
    font-weight: 800;
    color: #0f172a;
    line-height: 1.3;
  }

  .guide-block-body {
    font-size: 0.95rem;
    line-height: 1.62;
    color: #1e293b;
    max-inline-size: 100%;
    min-inline-size: 0;
    overflow-wrap: break-word;
    word-break: break-word;
  }

  .guide-block-body .table-scroll,
  .guide-ru-fallback .table-scroll,
  .table-scroll {
    display: block;
    inline-size: 100%;
    max-inline-size: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-block: 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
  }

  .guide-md-table {
    inline-size: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
  }

  .guide-md-table th,
  .guide-md-table td {
    padding: 8px 10px;
    border: 1px solid #cbd5e1;
    text-align: start;
    vertical-align: top;
  }

  .guide-md-table th {
    background: #f1f5f9;
    font-weight: 700;
    color: #0f172a;
  }

  .guide-block-body h3 {
    margin: 16px 0 8px;
    font-size: 1.04rem;
    font-weight: 700;
    color: #0f172a;
  }

  .guide-block-body h4 {
    margin: 12px 0 6px;
    font-size: 0.96rem;
    font-weight: 700;
    color: #1e293b;
  }

  .guide-block-body p {
    margin: 0 0 10px;
  }

  .guide-block-body ul,
  .guide-block-body ol {
    margin: 0 0 12px;
    padding-inline-start: 22px;
  }

  .guide-block-body li {
    margin-block-end: 5px;
  }

  .guide-block-body blockquote {
    margin: 10px 0;
    padding: 10px 14px;
    border-inline-start: 4px solid #0f4c81;
    background: #f8fafc;
    border-radius: 6px;
    color: #334155;
  }

  .guide-math-display {
    margin-block: 10px;
    padding: 10px 14px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-inline-start: 4px solid #0f4c81;
    border-radius: 8px;
    overflow-x: auto;
    max-inline-size: 100%;
    font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace);
    font-size: 0.9rem;
    color: #0f172a;
  }

  .guide-math-inline {
    padding: 1px 5px;
    background: #f1f5f9;
    border-radius: 4px;
    font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace);
    font-size: 0.9em;
    color: #0f172a;
  }

  .guide-ru-only-notice {
    margin-block: 8px 12px;
    padding: 10px 14px;
    border-radius: 8px;
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-inline-start: 4px solid #d97706;
    color: #78350f;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.45;
  }

  .sec-term.guide-ru-fallback {
    display: block;
    margin-inline-start: 0;
    padding: 12px 16px;
    font-size: 0.94rem;
    color: #334155;
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 10px;
    inline-size: 100%;
    box-sizing: border-box;
  }

  .selfcheck-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-block-end: 12px;
  }

  .selfcheck-questions-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .selfcheck-question-card {
    padding: 14px 16px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: #f8fafc;
  }

  .selfcheck-question-title {
    margin: 0 0 8px;
    font-size: 1rem;
    font-weight: 800;
    color: #0f172a;
  }

  .selfcheck-question-body,
  .selfcheck-q-text {
    font-size: 0.95rem;
    line-height: 1.56;
    color: #1e293b;
    margin-block-end: 10px;
  }

  .selfcheck-answer {
    border: 1px solid #bae6fd;
    border-radius: 8px;
    background: #ffffff;
    overflow: hidden;
  }

  .selfcheck-answer > summary {
    padding: 10px 14px;
    font-size: 0.92rem;
    font-weight: 700;
    color: #0f4c81;
    background: #f0f9ff;
    cursor: pointer;
    min-block-size: 42px;
    display: flex;
    align-items: center;
    user-select: none;
  }

  .selfcheck-answer > summary:hover {
    background: #e0f2fe;
  }

  .selfcheck-answer[open] > summary {
    border-block-end: 1px solid #bae6fd;
  }

  .selfcheck-answer-body,
  .selfcheck-a-text {
    padding: 12px 14px;
    font-size: 0.93rem;
    line-height: 1.56;
    color: #0f172a;
  }

  /* Glossary v14 Filter Bar & Section Grouping */
  .glossary-filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-block: 12px 16px;
    padding: 12px 14px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
  }

  .glossary-sys-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .glossary-sys-chip {
    min-block-size: 36px;
    padding: 5px 12px;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    color: #1e293b;
    font-size: 0.84rem;
    font-weight: 700;
    cursor: pointer;
  }

  .glossary-sys-chip.active,
  .glossary-sys-chip[aria-pressed="true"] {
    background: #0f4c81;
    border-color: #0f4c81;
    color: #ffffff;
  }

  .glossary-quick-search {
    flex: 1 1 220px;
    max-inline-size: 320px;
    min-block-size: 38px;
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid #cbd5e1;
    font-size: 0.9rem;
  }

  .glossary-section-group-row th {
    background: #e2e8f0 !important;
    color: #0f172a !important;
    font-size: 0.92rem !important;
    font-weight: 800 !important;
    padding: 8px 12px !important;
    text-align: start !important;
  }

  /* =========================================================================
     v15.2: Entrance & Two Depth Levels (Home Purpose, 8-Step Strip, Depth Toggle)
     ========================================================================= */
  .home-purpose {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 16px 18px;
    border-radius: 14px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-inline-start: 4px solid #0f4c81;
  }

  .home-purpose-h2 {
    margin: 0;
    font-size: clamp(1.08rem, 1.8vw, 1.25rem);
    font-weight: 800;
    color: #0f172a;
  }

  .home-purpose-text {
    margin: 0;
    font-size: 0.94rem;
    line-height: 1.52;
    color: #1e293b;
  }

  .home-route-h3 {
    margin: 2px 0 0;
    font-size: 0.92rem;
    font-weight: 700;
    color: #0f4c81;
  }

  .home-route {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
  }

  .home-route-item {
    margin: 0;
    padding: 0;
    display: flex;
  }

  .home-route-step {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    inline-size: 100%;
    min-block-size: 48px;
    padding: 10px 12px;
    border-radius: 10px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: #0f172a;
    text-decoration: none;
    transition: border-color 0.12s ease, background-color 0.12s ease, box-shadow 0.12s ease;
  }

  .home-route-step:hover {
    border-color: #0f4c81;
    background: #eff6ff;
    box-shadow: var(--shadow-sm);
  }

  .home-route-step:focus-visible {
    outline: 3px solid #0f4c81;
    outline-offset: 2px;
  }

  .home-route-step-body {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-inline-size: 0;
  }

  .home-route-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    inline-size: 22px;
    block-size: 22px;
    border-radius: 999px;
    background: #0f4c81;
    color: #ffffff;
    font-size: 0.78rem;
    font-weight: 800;
    flex-shrink: 0;
  }

  .home-route-step-label,
  .home-route-step-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: #0f172a;
    line-height: 1.25;
  }

  .home-route-step-hint,
  .home-route-step-sub {
    font-size: 0.8rem;
    line-height: 1.35;
    color: #475569;
  }

  .home-route-experienced {
    margin: 2px 0 0;
    font-size: 0.86rem;
    line-height: 1.45;
    color: #334155;
  }

  .home-route-experienced a,
  .home-route-exp-link {
    color: #0f4c81;
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 2px;
  }

  .home-route-experienced a:focus-visible,
  .home-route-exp-link:focus-visible {
    outline: 2px solid #0f4c81;
    outline-offset: 2px;
    border-radius: 4px;
  }

  .home-v13-sys-learn,
  .home-v13-sys-prereq {
    margin: 0;
    font-size: 0.81rem;
    line-height: 1.34;
    color: #334155;
  }

  .home-v13-sys-learn strong,
  .home-v13-sys-prereq strong {
    color: #0f172a;
  }

  @media (max-width: 1023px) {
    .home-route {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }
  }

  @media (max-width: 768px) {
    .home-purpose {
      padding: 12px 14px;
      gap: 8px;
    }

    .home-route {
      grid-template-columns: 1fr;
      gap: 8px;
    }

    .home-v13-sys-card {
      padding: 12px 14px;
      gap: 5px;
    }

    .home-v13-sys-icon {
      inline-size: 34px;
      block-size: 34px;
    }

    .home-v13-sys-title {
      font-size: 1.02rem;
      line-height: 1.2;
    }

    .home-v13-sys-desc {
      font-size: 0.8rem;
      line-height: 1.3;
    }

    .home-v13-sys-learn,
    .home-v13-sys-prereq {
      font-size: 0.76rem;
      line-height: 1.26;
    }

    .home-v13-sys-counts {
      font-size: 0.78rem;
      line-height: 1.22;
    }
  }

  .system-article-header {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .system-article-meta {
    margin: 4px 0 0;
    font-size: 0.82rem;
    line-height: 1.38;
    color: #475569;
    font-weight: 500;
  }

  .guide-depth-toggle {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
    padding: 8px 12px;
    border-radius: 10px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
  }

  .guide-depth-btn-row {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
  }

  .guide-depth-btn {
    min-block-size: 36px;
    padding: 5px 12px;
    border-radius: 8px;
    border: 1px solid #94a3b8;
    background: #ffffff;
    color: #0f172a;
    font-family: inherit;
    font-size: 0.84rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
  }

  .guide-depth-btn:hover {
    border-color: #0f4c81;
    background: #eff6ff;
  }

  .guide-depth-btn.active,
  .guide-depth-btn[aria-pressed="true"] {
    background: #0f4c81;
    border-color: #0f4c81;
    color: #ffffff;
  }

  .guide-depth-btn:focus-visible {
    outline: 3px solid #0f4c81;
    outline-offset: 2px;
  }

  .guide-depth-hint {
    font-size: 0.81rem;
    line-height: 1.35;
    color: #475569;
  }

  .guide-steps-strip {
    position: static;
    max-inline-size: 100%;
    margin-block: 10px 6px;
    padding: 6px 8px;
    border-radius: 10px;
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    box-sizing: border-box;
  }

  .guide-steps-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: stretch;
    gap: 6px;
    overflow-x: auto;
    max-inline-size: 100%;
    scrollbar-width: thin;
  }

  .guide-step {
    flex: 1 1 0;
    min-inline-size: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
  }

  .guide-step-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 2px;
    inline-size: 100%;
    min-block-size: 42px;
    padding: 5px 8px;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: #1e293b;
    font-size: 0.8rem;
    font-weight: 700;
    text-decoration: none;
    box-sizing: border-box;
    transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
  }

  .guide-step-top {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
  }

  .guide-step-caption {
    font-size: 0.72rem;
    font-weight: 500;
    line-height: 1.22;
    color: #475569;
  }

  .guide-step-sublink {
    font-size: 0.72rem;
    font-weight: 700;
    color: #0f4c81;
    text-decoration: underline;
    text-underline-offset: 2px;
    padding-inline: 4px;
    white-space: nowrap;
  }

  .guide-step-sublink:focus-visible {
    outline: 2px solid #0f4c81;
    outline-offset: 2px;
    border-radius: 4px;
  }

  .guide-step-link:hover {
    border-color: #0f4c81;
    background: #eff6ff;
    color: #0f4c81;
  }

  .guide-step-link:focus-visible {
    outline: 3px solid #0f4c81;
    outline-offset: 2px;
  }

  .guide-step[aria-current="step"] .guide-step-link,
  .guide-step.active .guide-step-link {
    background: #0f4c81;
    border-color: #0f4c81;
    color: #ffffff;
  }

  .guide-step[aria-current="step"] .guide-step-caption,
  .guide-step.active .guide-step-caption {
    color: rgba(255, 255, 255, 0.88);
  }

  .guide-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    inline-size: 18px;
    block-size: 18px;
    border-radius: 999px;
    background: rgba(15, 76, 129, 0.12);
    color: inherit;
    font-size: 0.72rem;
    font-weight: 800;
    flex-shrink: 0;
  }

  .guide-step[aria-current="step"] .guide-step-num,
  .guide-step.active .guide-step-num {
    background: rgba(255, 255, 255, 0.24);
    color: #ffffff;
  }

  @media (max-width: 1023px) {
    .guide-step {
      flex: 0 0 auto;
      max-inline-size: 195px;
    }
  }

  @media (max-width: 768px) {
    .guide-steps-strip {
      margin-block: 6px 4px;
      padding: 4px 6px;
    }

    .guide-step {
      max-inline-size: 170px;
    }

    .guide-step-link {
      min-block-size: 36px;
      padding: 3px 7px;
      font-size: 0.76rem;
    }

    .guide-step-caption {
      font-size: 0.68rem;
      line-height: 1.15;
    }
  }

  details.guide-depth-details {
    margin-block-start: 8px;
    border: 1px solid #bae6fd;
    border-radius: 10px;
    background: #ffffff;
    overflow: hidden;
  }

  details.guide-depth-details > summary.guide-depth-summary {
    padding: 10px 14px;
    min-block-size: 42px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: #f0f9ff;
    color: #0f4c81;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
  }

  details.guide-depth-details > summary.guide-depth-summary:hover {
    background: #e0f2fe;
  }

  details.guide-depth-details[open] > summary.guide-depth-summary {
    border-block-end: 1px solid #bae6fd;
  }

  details.guide-depth-details > .guide-block-body,
  details.guide-depth-details > .guide-ru-fallback,
  details.guide-depth-details > .system-engineer-layer {
    padding: 12px 14px;
  }

  /* =========================================================================
   * v15.4: Field origin tags («измерено» / «принято» / «справочно»)
   * ========================================================================= */
  .field-origin-tags-row {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-block: 2px 3px;
  }

  .field-origin-tag {
    display: inline-flex;
    align-items: center;
    padding: 1px 7px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: 0.01em;
    border: 1px solid transparent;
    cursor: help;
    max-inline-size: 100%;
  }

  .field-origin-tag[data-origin="measured"] {
    background: #ecfdf5;
    color: #065f46;
    border-color: #a7f3d0;
  }

  .field-origin-tag[data-origin="assumed"] {
    background: #fffbeb;
    color: #92400e;
    border-color: #fde68a;
  }

  .field-origin-tag[data-origin="reference"] {
    background: #eff6ff;
    color: #1e40af;
    border-color: #bfdbfe;
  }

  /* =========================================================================
   * v15.4: «Что это значит» и «Границы применимости» в карточке результата
   * ========================================================================= */
  .calc-card-meaning,
  .calc-card-limits {
    margin-block-start: 10px;
    padding: 9px 12px;
    border-radius: 8px;
    font-size: 0.88rem;
    line-height: 1.45;
    overflow-wrap: anywhere;
  }

  .calc-card-meaning {
    background: #f0f9ff;
    border-inline-start: 4px solid #0284c7;
    color: #0c4a6e;
  }

  .calc-card-limits {
    background: #f8fafc;
    border-inline-start: 4px solid #64748b;
    color: #334155;
  }

  .calc-save-error-banner {
    margin-block-start: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    font-size: 0.85rem;
    font-weight: 600;
  }

  /* =========================================================================
   * v15.4: Учебные опыты в калькуляторах (details.calc-experiments)
   * ========================================================================= */
  details.calc-experiments {
    margin-block-start: 14px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: #ffffff;
    overflow: hidden;
    max-inline-size: 100%;
    box-sizing: border-box;
  }

  details.calc-experiments > summary.calc-experiments-summary {
    padding: 11px 16px;
    min-block-size: 44px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    background: #f1f5f9;
    color: #0f172a;
    font-size: 0.96rem;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
  }

  details.calc-experiments > summary.calc-experiments-summary:hover {
    background: #e2e8f0;
  }

  details.calc-experiments[open] > summary.calc-experiments-summary {
    border-block-end: 1px solid #cbd5e1;
    background: #e0f2fe;
    color: #0f4c81;
  }

  .calc-experiments-body {
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-inline-size: 100%;
    box-sizing: border-box;
  }

  .calc-experiments-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    padding-block-end: 8px;
    border-block-end: 1px dashed #cbd5e1;
  }

  .calc-experiments-subtitle {
    font-size: 0.86rem;
    color: #475569;
    font-weight: 600;
  }

  .calc-experiments-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  .exp-item {
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 12px 14px;
    background: #f8fafc;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-inline-size: 100%;
    box-sizing: border-box;
    overflow-wrap: anywhere;
  }

  .exp-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
  }

  .exp-item-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 6px;
    background: #e0f2fe;
    color: #075985;
    font-size: 0.78rem;
    font-weight: 700;
  }

  .exp-question {
    margin: 0;
    font-size: 0.93rem;
    line-height: 1.45;
    color: #0f172a;
  }

  .exp-hypothesis-label {
    font-size: 0.82rem;
    font-weight: 700;
    color: #475569;
  }

  .exp-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .exp-option-row {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
  }

  .exp-option-row input[type="radio"] {
    margin-block-start: 3px;
    flex-shrink: 0;
    inline-size: 18px;
    block-size: 18px;
    cursor: pointer;
  }

  .exp-option-row label {
    font-size: 0.88rem;
    line-height: 1.38;
    color: #1e293b;
    cursor: pointer;
    flex: 1 1 auto;
    min-inline-size: 0;
    overflow-wrap: anywhere;
  }

  .exp-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-block-start: 2px;
  }

  .exp-hint-warning {
    padding: 7px 10px;
    border-radius: 7px;
    background: #fffbeb;
    border: 1px solid #fcd34d;
    color: #92400e;
    font-size: 0.84rem;
    font-weight: 600;
  }

  .exp-result-box {
    margin-block-start: 4px;
    padding: 10px 12px;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    display: flex;
    flex-direction: column;
    gap: 7px;
    font-size: 0.87rem;
    line-height: 1.45;
    overflow-wrap: anywhere;
  }

  .exp-verdict {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.83rem;
    font-weight: 700;
  }

  .exp-verdict.is-correct {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
  }

  .exp-verdict.is-wrong {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
  }

  .exp-delta {
    padding: 6px 9px;
    border-radius: 6px;
    background: #f1f5f9;
    color: #0f172a;
  }

  .exp-explain,
  .exp-formula {
    color: #1e293b;
  }

  .exp-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-block-start: 4px;
    border-block-start: 1px dashed #e2e8f0;
    font-size: 0.83rem;
  }

  /* =========================================================================
   * v15.4: Сравнение двух наборов А / Б (#sec-saved, table#saved-comparison-table)
   * ========================================================================= */
  .saved-compare-selectors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 10px;
    margin-block-end: 10px;
  }

  .saved-compare-select-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .saved-compare-select-field label {
    font-size: 0.84rem;
    font-weight: 700;
    color: #0f172a;
  }

  .saved-compare-select-field select {
    inline-size: 100%;
    max-inline-size: 100%;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    font-size: 0.85rem;
    color: #0f172a;
  }

  .saved-compare-notice-banner,
  .saved-compare-warning-banner,
  .saved-compare-blocked-banner {
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    line-height: 1.4;
    margin-block-end: 8px;
  }

  .saved-compare-notice-banner {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1e3a8a;
  }

  .saved-compare-warning-banner {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
  }

  .saved-compare-blocked-banner {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    font-weight: 600;
  }

  @media (max-width: 600px) {
    .calc-experiments-body {
      padding: 10px;
    }

    .exp-item {
      padding: 10px;
    }

    table#saved-comparison-table,
    table#saved-comparison-table tbody {
      display: block;
      inline-size: 100%;
    }

    table#saved-comparison-table thead {
      position: absolute;
      inline-size: 1px;
      block-size: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border: 0;
    }

    table#saved-comparison-table tbody tr {
      display: block;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      margin-block-end: 8px;
      padding: 8px 10px;
      background: #ffffff;
    }

    table#saved-comparison-table tbody tr.saved-compare-group-row {
      background: #e2e8f0;
      padding: 6px 10px;
    }

    table#saved-comparison-table tbody td {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 8px;
      padding: 4px 0;
      border: none;
      border-block-end: 1px dashed #f1f5f9;
      text-align: end;
      font-size: 0.84rem;
      overflow-wrap: anywhere;
    }

    table#saved-comparison-table tbody td:last-child {
      border-block-end: none;
    }

    table#saved-comparison-table tbody td[data-label]::before {
      content: attr(data-label);
      font-weight: 700;
      color: #475569;
      text-align: start;
      flex: 0 0 42%;
    }
  }

  /* =========================================================================
   * v15.5: Случаи (показания приборов, статус шага, разбор дистракторов, вывод)
   *        и справочник в контексте (a.term-link, #term-popover, mark.search-hit)
   * ========================================================================= */
  .sr-only {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .trainer-case-header-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
  }

  .trainer-step-header-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-block-end: 10px;
  }

  .trainer-step-header-row h4 {
    margin: 0;
  }

  .trainer-step-status {
    display: inline-flex;
    align-items: center;
    padding-block: 4px;
    padding-inline: 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    background: #e0f2fe;
    color: #075985;
    border: 1px solid #bae6fd;
  }

  .trainer-step-status[data-step-status="5"] {
    background: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
  }

  .trainer-step-status[data-step-status="6"] {
    background: #dcfce7;
    color: #166534;
    border-color: #86efac;
  }

  .trainer-readings-box {
    margin-block-start: 12px;
    margin-block-end: 12px;
    padding-block: 12px;
    padding-inline: 14px;
    border-radius: 10px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-inline-start: 4px solid #0284c7;
  }

  .trainer-readings-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-block-end: 8px;
  }

  .trainer-readings-title {
    font-size: 0.92rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0;
  }

  .trainer-readings-node-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-block-end: 8px;
    font-size: 0.88rem;
    color: #334155;
  }

  .trainer-readings-list {
    margin: 0;
    padding-inline-start: 18px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 6px 14px;
    font-size: 0.88rem;
    color: #1e293b;
  }

  .trainer-readings-list li {
    line-height: 1.4;
  }

  .trainer-no-selection-alert {
    margin-block-start: 10px;
    padding-block: 9px;
    padding-inline: 12px;
    border-radius: 8px;
    background: #fffbeb;
    border: 1px solid #fcd34d;
    color: #92400e;
    font-size: 0.88rem;
    font-weight: 600;
  }

  details.trainer-other-options {
    margin-block-start: 10px;
    border: 1px solid #cbd5e1;
    border-radius: 9px;
    background: #f8fafc;
    overflow: hidden;
  }

  details.trainer-other-options > summary {
    padding-block: 9px;
    padding-inline: 12px;
    font-size: 0.88rem;
    font-weight: 700;
    color: #0f4c81;
    cursor: pointer;
    user-select: none;
    background: #f1f5f9;
  }

  details.trainer-other-options[open] > summary {
    border-block-end: 1px solid #cbd5e1;
    background: #e0f2fe;
  }

  .trainer-other-options-list {
    padding-block: 10px;
    padding-inline: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .trainer-other-option-item {
    padding-block: 8px;
    padding-inline: 10px;
    border-radius: 7px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    font-size: 0.86rem;
    line-height: 1.42;
  }

  .trainer-other-option-title {
    font-weight: 700;
    color: #1e293b;
    margin-block-end: 4px;
  }

  .trainer-other-option-why {
    color: #475569;
    margin: 0;
  }

  .trainer-conclusion-box {
    margin-block-end: 14px;
    padding-block: 12px;
    padding-inline: 14px;
    border-radius: 10px;
    background: #f0fdf4;
    border: 1px solid #86efac;
    border-inline-start: 4px solid #16a34a;
    color: #14532d;
  }

  .trainer-conclusion-box h5 {
    margin-block: 0 6px;
    font-size: 0.96rem;
    color: #14532d;
  }

  .trainer-confirmed-cause {
    margin-block: 0 8px;
    font-size: 0.9rem;
    line-height: 1.45;
  }

  .trainer-procedure-note {
    margin: 0;
    padding-block-start: 8px;
    border-block-start: 1px dashed #86efac;
    font-size: 0.84rem;
    line-height: 1.42;
    color: #166534;
  }

  .trainer-local-storage-note {
    display: inline-block;
    font-size: 0.84rem;
    color: #475569;
  }

  a.term-link {
    color: inherit;
    text-decoration: underline dotted #0284c7;
    text-decoration-thickness: 1.5px;
    text-underline-offset: 3px;
    cursor: pointer;
    border-radius: 2px;
    transition: background-color 0.15s ease;
  }

  a.term-link:hover,
  a.term-link:focus-visible {
    background-color: #e0f2fe;
    color: #0369a1;
  }

  .term-popover {
    position: fixed;
    z-index: 1250;
    inline-size: min(380px, calc(100vw - 16px));
    max-inline-size: calc(100vw - 16px);
    max-block-size: min(75vh, 420px);
    overflow-y: auto;
    background: #ffffff;
    color: #0f172a;
    border: 1px solid #94a3b8;
    border-radius: 12px;
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.22);
    padding-block: 12px;
    padding-inline: 14px;
    box-sizing: border-box;
    font-size: 0.88rem;
    line-height: 1.45;
  }

  .term-popover[hidden] {
    display: none !important;
  }

  .term-popover-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
    margin-block-end: 6px;
  }

  .term-popover-title-wrap {
    flex: 1 1 auto;
    min-inline-size: 0;
  }

  .term-popover-title {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    color: #0f172a;
    line-height: 1.3;
  }

  .term-popover-sec-title {
    display: block;
    font-size: 0.82rem;
    color: #475569;
    margin-block-start: 2px;
  }

  .term-popover-close {
    flex-shrink: 0;
    inline-size: 28px;
    block-size: 28px;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
    background: #f8fafc;
    color: #334155;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .term-popover-close:hover {
    background: #e2e8f0;
    color: #0f172a;
  }

  .term-popover-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-block-end: 8px;
    font-size: 0.8rem;
    color: #475569;
  }

  .term-popover-def {
    color: #1e293b;
    margin-block-end: 10px;
    overflow-wrap: anywhere;
  }

  .term-popover-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-block-start: 8px;
    border-block-start: 1px dashed #cbd5e1;
  }

  mark.search-hit {
    background-color: #fef08a;
    color: #713f12;
    padding-inline: 2px;
    border-radius: 3px;
    font-weight: 600;
  }

  @media (max-width: 599px) {
    .term-popover {
      inset-inline-start: 8px !important;
      inset-inline-end: 8px !important;
      inset-block-end: 8px !important;
      inset-block-start: auto !important;
      inline-size: auto !important;
      max-inline-size: calc(100vw - 16px) !important;
    }
  }

  /* =========================================================================
     v15.6: Trust Labels (.trust-label, .trust-label-row, .trust-legend) & LTR Bidi
     ========================================================================= */
  .trust-legend {
    margin-block-end: 14px;
    padding-block: 10px;
    padding-inline: 14px;
    border-radius: 10px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-inline-start: 4px solid #0f4c81;
    font-size: 0.86rem;
    line-height: 1.45;
    color: #1e293b;
  }

  .trust-legend > summary {
    cursor: pointer;
    font-weight: 700;
    color: #0f4c81;
    user-select: none;
    list-style-position: inside;
  }

  .trust-legend > summary:focus-visible {
    outline: 2px solid #0f4c81;
    outline-offset: 2px;
    border-radius: 4px;
  }

  .trust-legend-body {
    margin-block-start: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .trust-legend-intro {
    margin: 0;
    color: #334155;
  }

  .trust-legend-list {
    margin: 0;
    padding-inline-start: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .trust-legend-item {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
  }

  .trust-label-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    margin-block-start: 4px;
    margin-block-end: 10px;
    padding-block: 4px;
    padding-inline: 8px;
    border-radius: 8px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    font-size: 0.81rem;
    line-height: 1.38;
    max-inline-size: 100%;
    box-sizing: border-box;
  }

  .trust-label {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding-block: 2px;
    padding-inline: 8px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    line-height: 1.3;
    border: 1px solid transparent;
    max-inline-size: 100%;
    overflow-wrap: anywhere;
  }

  .trust-label--example {
    background-color: #fef3c7;
    color: #78350f;
    border-color: #d97706;
  }

  .trust-label--principle {
    background-color: #e0f2fe;
    color: #0c4a6e;
    border-color: #0284c7;
  }

  .trust-label--manufacturer {
    background-color: #f3e8ff;
    color: #4c1d95;
    border-color: #7c3aed;
  }

  .trust-label-source {
    color: #0f4c81;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
    overflow-wrap: anywhere;
  }

  .trust-label-source:hover {
    color: #075985;
  }

  .trust-label-source:focus-visible,
  .trust-label-guide-link:focus-visible {
    outline: 2px solid #0f4c81;
    outline-offset: 2px;
    border-radius: 3px;
  }

  .trust-label-note {
    color: #475569;
    font-style: italic;
    overflow-wrap: anywhere;
  }

  .trust-label-guide-link {
    color: #0f4c81;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
  }

  .trainer-verify-calc-btn {
    display: inline-block;
    text-align: center;
    line-height: 1.45;
  }

  .case-calc-ltr {
    display: inline;
    unicode-bidi: isolate;
    white-space: nowrap;
  }
}

@layer components {
  /* =========================================================================
     v15.7: Схемы как уроки — панель маршрутов, оверлей, состояния пинов, поля 6–9 окна узла
     ========================================================================= */
  .diagram-routes {
    margin-block: 0.75rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-subtle);
    max-inline-size: 100%;
    box-sizing: border-box;
    overflow-wrap: anywhere;
  }
  .diagram-routes-title {
    margin: 0 0 0.35rem;
    font-size: 1rem;
  }
  .diagram-routes-intro {
    margin: 0 0 0.5rem;
    font-size: 0.86rem;
    color: var(--text-muted);
  }
  .diagram-route-picker {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-block-end: 0.5rem;
  }
  .diagram-route-btn {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    min-block-size: 44px;
    min-inline-size: 44px;
    max-inline-size: 100%;
    box-sizing: border-box;
    padding-block: 0.35rem;
    padding-inline: 0.65rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: #ffffff;
    color: inherit;
    cursor: pointer;
    font: inherit;
    font-size: 0.84rem;
    font-weight: 600;
    text-align: start;
  }
  .diagram-route-btn:hover {
    border-color: var(--brand-primary);
    background: #eff6ff;
  }
  .diagram-route-btn[aria-pressed="true"] {
    border-color: var(--brand-primary);
    background: #eff6ff;
    box-shadow: inset 0 0 0 2px var(--brand-primary);
  }
  .diagram-route-btn:focus-visible,
  .diagram-route-nav-btn:focus-visible,
  .node-neighbor-btn:focus-visible,
  .node-route-btn:focus-visible {
    outline: 3px solid var(--brand-accent);
    outline-offset: 2px;
  }
  .diagram-medium-badge {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem;
    max-inline-size: 100%;
    padding-block: 0.1rem;
    padding-inline: 0.4rem;
    border-radius: 999px;
    border: 1.5px solid var(--medium-color, #334155);
    background: #ffffff;
    font-size: 0.76rem;
    font-weight: 700;
    white-space: normal;
  }
  .diagram-medium-symbol {
    color: var(--medium-color, inherit);
    font-weight: 800;
  }
  .diagram-route-summary {
    margin: 0.25rem 0 0.5rem;
    font-size: 0.88rem;
  }
  .diagram-route-stepline {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem;
    margin: 0 0 0.4rem;
    font-size: 0.9rem;
  }
  .diagram-route-stepof {
    white-space: nowrap;
  }
  .diagram-route-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
  }
  .diagram-route-nav-btn {
    min-block-size: 44px;
    min-inline-size: 44px;
  }
  .diagram-route-nav-btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
  }
  .diagram-route-kbd-hint {
    margin: 0.35rem 0 0;
    font-size: 0.78rem;
    color: var(--text-muted);
  }
  .diagram-route-steps-title {
    margin: 0.6rem 0 0.25rem;
    font-size: 0.88rem;
  }
  .diagram-route-steps {
    display: grid;
    gap: 0.2rem;
    margin: 0;
    padding-inline-start: 1.4rem;
    font-size: 0.85rem;
  }
  .diagram-route-step {
    padding-block: 0.15rem;
    padding-inline: 0.35rem;
    border-radius: 4px;
    overflow-wrap: anywhere;
  }
  .diagram-route-step--current {
    background: #fef3c7;
    outline: 2px solid #b45309;
    font-weight: 600;
  }
  .route-step-gap {
    display: block;
    font-size: 0.78rem;
    font-style: italic;
    color: var(--text-muted);
  }
  .route-step-params,
  .diagram-flow-params {
    margin-inline-start: 0.25rem;
    font-style: italic;
    color: #334155;
  }
  .diagram-flow-source {
    margin: 0.4rem 0 0;
    font-size: 0.8rem;
    overflow-wrap: anywhere;
  }
  .diagram-route-overlay {
    position: absolute;
    inset: 0;
    inline-size: 100%;
    block-size: 100%;
    pointer-events: none;
    overflow: visible;
  }
  /* Толщина в пикселях экрана (3.5 px) при растяжении viewBox 0 0 100 100: vector-effect non-scaling-stroke */
  .diagram-route-path {
    fill: none;
    stroke-width: 3.5;
    stroke-linejoin: round;
    stroke-linecap: round;
    vector-effect: non-scaling-stroke;
    opacity: 0.9;
  }
  .diagram-route-gap {
    stroke: #ffffff;
    stroke-width: 3.5;
    stroke-dasharray: 6 5;
    vector-effect: non-scaling-stroke;
  }
  .diagram-node-pin--visited > span {
    background: #475569;
  }
  .diagram-node-pin--current > span {
    background: #b45309;
    transform: scale(1.25);
    box-shadow: 0 0 0 3px #ffffff, 0 0 0 6px #b45309;
  }
  .diagram-node-pin:focus-visible {
    outline: 3px solid var(--brand-accent);
    outline-offset: 0;
    border-radius: 999px;
  }
  @media (prefers-reduced-motion: reduce) {
    .diagram-node-pin > span,
    .diagram-canvas-inner {
      transition: none !important;
    }
  }

  /* Окно узла: поля 6–9 */
  .diagram-flows-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.5rem;
    margin-block-start: 0.35rem;
  }
  .diagram-flows-subtitle {
    margin: 0 0 0.2rem;
    font-size: 0.85rem;
  }
  .diagram-flow-list,
  .node-neighbor-list,
  .node-route-list {
    display: grid;
    gap: 0.3rem;
    margin: 0.3rem 0 0;
    padding: 0;
    list-style: none;
  }
  .diagram-flow-item {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.3rem;
    font-size: 0.86rem;
  }
  .diagram-flow-terminal,
  .diagram-heat-direction,
  .diagram-flow-none {
    margin: 0.25rem 0 0;
    font-size: 0.85rem;
  }
  .node-neighbor-btn,
  .node-route-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    inline-size: 100%;
    min-block-size: 44px;
    padding-block: 0.35rem;
    padding-inline: 0.6rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: #ffffff;
    color: inherit;
    cursor: pointer;
    font: inherit;
    font-size: 0.85rem;
    text-align: start;
  }
  .node-neighbor-btn:hover,
  .node-route-btn:hover {
    border-color: var(--brand-primary);
    background: #eff6ff;
  }
  .node-heat-box {
    background: #fff7ed;
    border-color: #fdba74;
  }

  /* Телефон: окно узла — нижний лист (п. 2.2b); режим fullscreen не меняется */
  @media (max-width: 599px) {
    dialog#diagram-node-dialog[data-modal-mode="node"]:modal {
      position: fixed;
      inset-block-start: auto;
      inset-block-end: 0;
      inset-inline: 0;
      margin: 0;
      inline-size: 100%;
      max-inline-size: 100%;
      max-block-size: 85dvh;
      box-sizing: border-box;
      border-start-start-radius: 16px;
      border-start-end-radius: 16px;
      border-end-start-radius: 0;
      border-end-end-radius: 0;
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }
    dialog#diagram-node-dialog[data-modal-mode="node"] .node-dialog-header {
      position: sticky;
      inset-block-start: 0;
      z-index: 1;
      flex: 0 0 auto;
    }
    dialog#diagram-node-dialog[data-modal-mode="node"] .node-dialog-body {
      flex: 1 1 auto;
      max-block-size: none;
      overflow-y: auto;
      overscroll-behavior: contain;
    }
    .diagram-route-picker {
      flex-direction: column;
    }
    .diagram-route-btn {
      inline-size: 100%;
    }
  }

  /* =========================================================================
     v15.8: Офлайн-полоса (#offline-bar) и полоса обновления (#sw-update-bar)
     Только логические CSS-свойства, кнопки >= 44 px, сдвиг контента без перекрытия
     ========================================================================= */
  .offline-bar[hidden],
  .sw-update-bar[hidden] {
    display: none !important;
  }

  .offline-bar {
    box-sizing: border-box;
    inline-size: 100%;
    max-inline-size: 100%;
    background: #fffbeb;
    color: #78350f;
    border-block-end: 2px solid #f59e0b;
    padding-block: 0.65rem;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
  }

  .offline-bar-inner {
    box-sizing: border-box;
    max-inline-size: 1440px;
    margin-inline: auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 0.75rem;
    font-size: 0.92rem;
    line-height: 1.45;
    font-weight: 500;
    overflow-wrap: anywhere;
  }

  .offline-bar-text {
    border-inline-start: 4px solid #d97706;
    padding-inline-start: 0.65rem;
  }

  .sw-update-bar {
    box-sizing: border-box;
    inline-size: 100%;
    max-inline-size: 100%;
    background: #eff6ff;
    color: #0f2f52;
    border-block-end: 2px solid #0f4c81;
    padding-block: 0.6rem;
    padding-inline: clamp(0.75rem, 2vw, 1.5rem);
  }

  .sw-update-bar-inner {
    box-sizing: border-box;
    max-inline-size: 1440px;
    margin-inline: auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem 1rem;
    font-size: 0.94rem;
    line-height: 1.4;
    font-weight: 600;
    overflow-wrap: anywhere;
  }

  .sw-update-bar-text {
    border-inline-start: 4px solid #0f4c81;
    padding-inline-start: 0.65rem;
  }

  .sw-update-bar-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
  }

  .sw-update-btn,
  .sw-later-btn {
    box-sizing: border-box;
    min-block-size: 44px;
    min-inline-size: 44px;
    padding-block: 0.45rem;
    padding-inline: 0.9rem;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
  }

  .sw-update-btn:focus-visible,
  .sw-later-btn:focus-visible {
    outline: 3px solid #0f4c81;
    outline-offset: 2px;
  }

  @media (prefers-reduced-motion: reduce) {
    .offline-bar,
    .sw-update-bar,
    .sw-update-btn,
    .sw-later-btn {
      transition: none !important;
      animation: none !important;
    }
  }
}

@layer print {
  @page {
    size: A4 portrait;
    margin: 9mm;
  }

  @media print {
    html, body {
      background: #ffffff !important;
      color: #000000 !important;
      margin: 0 !important;
      padding: 0 !important;
      min-block-size: auto !important;
      font-size: 9pt !important;
    }

    .site-header,
    .system-subnav,
    .breadcrumb-bar,
    .no-print,
    dialog:not([open]) {
      display: none !important;
    }

    body:not([data-print-mode]) #view-case.active-view,
    body:not([data-print-mode]) #view-case.active-view > #sec-trainer,
    body:not([data-print-mode]) #view-calc.active-view > #sec-calculators {
      display: block !important;
    }

    /* v15.7: маршрут на печати — только статический список шагов, без оверлея и кнопок */
    .diagram-route-overlay,
    .diagram-route-stepper,
    .diagram-route-picker {
      display: none !important;
    }
    .diagram-route-steps {
      display: block !important;
    }
    .diagram-route-step--current {
      background: none !important;
      outline: 1px solid #000000 !important;
    }

    .app-main,
    .app-shell {
      max-inline-size: 100% !important;
      padding: 0 !important;
      margin: 0 !important;
    }

    /* Reset table constraints so all columns & rows print cleanly */
    .table-wrapper {
      overflow: visible !important;
      max-block-size: none !important;
      max-inline-size: 100% !important;
      container-type: normal !important;
      border: none !important;
      margin-block: 4px !important;
    }

    .table-wrapper table {
      display: table !important;
      inline-size: 100% !important;
      border-collapse: collapse !important;
      font-size: 8.0pt !important;
      line-height: 1.24 !important;
    }

    .table-wrapper thead {
      display: table-header-group !important;
      position: static !important;
      background: #e2e8f0 !important;
    }

    .table-wrapper tbody {
      display: table-row-group !important;
    }

    .table-wrapper tr {
      display: table-row !important;
      page-break-inside: avoid !important;
      break-inside: avoid !important;
    }

    .table-wrapper th,
    .table-wrapper td {
      display: table-cell !important;
      position: static !important;
      padding: 3.8px 4.5px !important;
      border: 1px solid #1e293b !important;
      color: #000000 !important;
      background: #ffffff !important;
      vertical-align: middle !important;
    }

    .table-wrapper th.no-print,
    .table-wrapper td.no-print {
      display: none !important;
    }

    .table-wrapper thead th {
      background: #e2e8f0 !important;
      font-weight: 700 !important;
    }

    .table-wrapper td::before {
      content: none !important;
    }

    /* Mode 1: Print a single selected Shift Log A4 */
    body[data-print-mode="shift-log"] .app-view:not(#view-tools),
    body[data-print-mode="shift-log"] .section-card:not(#sec-shift-log),
    body[data-print-mode="shift-log"] .shift-logs-toolbar {
      display: none !important;
    }

    body[data-print-mode="shift-log"] #view-tools,
    body[data-print-mode="shift-log"] #sec-shift-log {
      display: block !important;
      border: none !important;
      padding: 0 !important;
      margin: 0 !important;
      box-shadow: none !important;
    }

    body[data-print-mode="shift-log"] .shift-log-print-area:not(.active-print-target) {
      display: none !important;
    }

    body[data-print-mode="shift-log"] .shift-log-print-area.active-print-target {
      display: block !important;
      border: 1.5px solid #0f172a !important;
      padding: 6px 8px !important;
      margin: 0 !important;
      page-break-inside: avoid !important;
      break-inside: avoid !important;
    }

    body[data-print-mode="shift-log"] .shift-log-sheet-header h3 {
      margin: 0 0 2px !important;
      font-size: 10.5pt !important;
    }

    body[data-print-mode="shift-log"] .shift-log-subtitle,
    body[data-print-mode="shift-log"] .shift-log-checklist,
    body[data-print-mode="shift-log"] .shift-log-footer {
      font-size: 7.6pt !important;
      line-height: 1.22 !important;
      margin-block: 3px !important;
    }

    body[data-print-mode="shift-log"] .shift-log-checklist ul {
      margin: 2px 0 !important;
      padding-inline-start: 14px !important;
    }

    body[data-print-mode="shift-log"] .shift-cell-input {
      border: none !important;
      background: transparent !important;
      padding: 0 !important;
      font-size: 7.2pt !important;
      inline-size: 100% !important;
    }

    /* Mode 2: Print Calculation Card (with Engine Warnings included) */
    body[data-print-mode="calc-card"] .app-view:not(#view-calc) {
      display: none !important;
    }

    body[data-print-mode="calc-card"] #view-calc,
    body[data-print-mode="calc-card"] #sec-calculators {
      display: block !important;
      border: none !important;
      padding: 0 !important;
      margin: 0 !important;
      box-shadow: none !important;
    }

    body[data-print-mode="calc-card"] .section-card:not(#sec-calculators),
    body[data-print-mode="calc-card"] #sec-calculators > .section-header,
    body[data-print-mode="calc-card"] .unit-switch-bar,
    body[data-print-mode="calc-card"] .calc-tabs-bar,
    body[data-print-mode="calc-card"] .calc-tabs,
    body[data-print-mode="calc-card"] form,
    body[data-print-mode="calc-card"] .form-grid,
    body[data-print-mode="calc-card"] .calc-grid,
    body[data-print-mode="calc-card"] .calc-meta-box,
    body[data-print-mode="calc-card"] .calc-card-actions,
    body[data-print-mode="calc-card"] .calc-card-wrapper:not(.active-print-card) {
      display: none !important;
    }

    body[data-print-mode="calc-card"] .calc-output:has(.active-print-card),
    body[data-print-mode="calc-card"] .calc-panel:has(.active-print-card) {
      display: block !important;
      border: none !important;
      padding: 0 !important;
      margin: 0 !important;
    }

    body[data-print-mode="calc-card"] .calc-card-wrapper.active-print-card {
      display: block !important;
      border: 2px solid #0f172a !important;
      padding: 12px 16px !important;
    }

    body[data-print-mode="calc-card"] .calc-warnings-stack {
      display: grid !important;
      gap: 4px !important;
      margin-block: 6px !important;
    }

    body[data-print-mode="calc-card"] .calc-warning-item {
      border: 1px solid #0f172a !important;
      padding: 4px 8px !important;
      color: #000000 !important;
      background: #f8fafc !important;
    }

    /* Mode 3: Print Equipment Survey A4 Report (#sec-survey) */
    body[data-print-mode="survey"] .app-view:not(#view-tools),
    body[data-print-mode="survey"] .section-card:not(#sec-survey) {
      display: none !important;
    }

    body[data-print-mode="survey"] #view-tools,
    body[data-print-mode="survey"] #sec-survey {
      display: block !important;
      border: none !important;
      padding: 0 !important;
      margin: 0 !important;
      box-shadow: none !important;
    }

    body[data-print-mode="survey"] .survey-tab-panel {
      display: block !important;
      margin-block-end: 10px !important;
    }

    body[data-print-mode="survey"] .survey-sheet-header input {
      border: none !important;
      background: transparent !important;
      padding: 0 !important;
      font-weight: 700 !important;
      font-size: 8.5pt !important;
    }

    /* v14 Stage 2.3 + v15.2 (п. 2.4d) + v15.5 (п. 2.8): Expand all self-check answers, depth details, and trainer-other-options in print mode */
    .guide-toc-bar,
    .guide-steps-strip,
    .guide-depth-toggle,
    .selfcheck-toolbar,
    details.calc-experiments,
    #term-popover {
      display: none !important;
    }

    a.term-link {
      text-decoration: none !important;
      color: inherit !important;
    }

    details.selfcheck-answer::details-content,
    details.guide-depth-details::details-content,
    details.trainer-other-options::details-content,
    details.trust-legend::details-content {
      display: block !important;
      content-visibility: visible !important;
    }

    details.selfcheck-answer > .selfcheck-answer-body,
    details.selfcheck-answer > .selfcheck-a-text,
    details.guide-depth-details > *,
    details.trainer-other-options > .trainer-other-options-list,
    details.trust-legend > .trust-legend-body {
      display: block !important;
      content-visibility: visible !important;
    }

    .trust-legend {
      background: #ffffff !important;
      color: #000000 !important;
      border: 1px solid #000000 !important;
      padding-block: 6px !important;
      padding-inline: 10px !important;
    }

    .trust-legend > summary {
      color: #000000 !important;
    }

    .trust-label-row {
      background: #ffffff !important;
      border: 1px solid #000000 !important;
      color: #000000 !important;
    }

    .trust-label,
    .trust-label--example,
    .trust-label--principle,
    .trust-label--manufacturer {
      background: #ffffff !important;
      color: #000000 !important;
      border: 1px solid #000000 !important;
    }

    .trust-label-source,
    .trust-label-note,
    .trust-label-guide-link {
      color: #000000 !important;
      text-decoration: none !important;
    }
  }
}