/* ============================================================================
   Standard Physics Dual-Target CSS System (Web & Print PDF)
   Based on: css-system-architecture.md
   Status: Active (Scoped to data-course="standard-physics")
   Last Updated: 2026-11-10
   ============================================================================ */

[data-course="standard-physics"] {
  /* ========================================================================
     1. Semantic Physics Palette (Conserved Quantities & Interactivity)
     ======================================================================== */
  --phy-matter:        #990f2b; /* Deep Crimson: Mass, particles, system boundaries, bodies */
  --phy-matter-bg:     #fdf2f4;
  --phy-energy:        #1e6b23; /* Forest Green: Energy states, heat dissipation, Joules, work */
  --phy-energy-bg:     #f2f9f1;
  --phy-force:         #0056b3; /* Sapphire Blue: Force vectors, Newtons, field interactions */
  --phy-force-bg:      #f0f7ff;
  --phy-momentum:      #c04800; /* Deep Amber: Momentum (p), impulse (J), velocity vectors */
  --phy-momentum-bg:   #fffaf0;
  --phy-field:         #5a32a3; /* Deep Violet: Electric/Magnetic flux, potential difference */
  --phy-field-bg:      #f7f3ff;

  /* ========================================================================
     2. Structural & Neutral Palette
     ======================================================================== */
  --color-text-main:   #212529; /* High-contrast charcoal (WCAG AAA) */
  --color-text-muted:  #495057; /* Secondary labels and captions */
  --color-bg-canvas:   #ffffff; /* Main reading background */
  --color-surface-sub: #f8f9fa; /* Task and callout card surface */
  --color-border-sub:  #dee2e6; /* Subdued card and table borders */
  --color-border-hard: #adb5bd; /* Emphasized boundaries */

  /* ========================================================================
     3. Typography & Spacing Scales
     ======================================================================== */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  
  --line-height-body:  1.65;
  --line-height-tight: 1.25;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

/* ============================================================================
   Typography & KaTeX Mathematical Integration
   ============================================================================ */

[data-course="standard-physics"] body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-canvas);
  line-height: var(--line-height-body);
  font-size: 16px;
}

[data-course="standard-physics"] h1,
[data-course="standard-physics"] h2,
[data-course="standard-physics"] h3,
[data-course="standard-physics"] h4 {
  color: #111827;
  line-height: var(--line-height-tight);
  font-weight: 700;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

[data-course="standard-physics"] h1 {
  font-size: 1.85rem;
  border-bottom: 2px solid var(--color-border-sub);
  padding-bottom: 0.3em;
}

[data-course="standard-physics"] h2 {
  font-size: 1.45rem;
}

[data-course="standard-physics"] h3 {
  font-size: 1.15rem;
}

[data-course="standard-physics"] p {
  margin-bottom: 1em;
}

[data-course="standard-physics"] .katex-display {
  background-color: var(--color-surface-sub);
  border-left: 4px solid var(--phy-force);
  padding: 1rem;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
}

/* ============================================================================
   NotebookTask Components (RFC-035)
   ============================================================================ */

[data-course="standard-physics"] .notebook-task {
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid var(--color-border-sub);
}

[data-course="standard-physics"] .notebook-task-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
}

[data-course="standard-physics"] .notebook-task-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.625rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* NotebookTask type-specific styling (data-type attributes) */
[data-course="standard-physics"] .notebook-task[data-type="practice"] .notebook-task-header {
  background-color: var(--phy-energy-bg);
  border-bottom: 2px solid var(--phy-energy);
}

[data-course="standard-physics"] .notebook-task[data-type="practice"] .notebook-task-badge {
  background-color: var(--phy-energy);
  color: white;
}

[data-course="standard-physics"] .notebook-task[data-type="diagram"] .notebook-task-header {
  background-color: var(--phy-force-bg);
  border-bottom: 2px solid var(--phy-force);
}

[data-course="standard-physics"] .notebook-task[data-type="diagram"] .notebook-task-badge {
  background-color: var(--phy-force);
  color: white;
}

[data-course="standard-physics"] .notebook-task[data-type="cer"] .notebook-task-header {
  background-color: var(--phy-matter-bg);
  border-bottom: 2px solid var(--phy-matter);
}

[data-course="standard-physics"] .notebook-task[data-type="cer"] .notebook-task-badge {
  background-color: var(--phy-matter);
  color: white;
}

[data-course="standard-physics"] .notebook-task[data-type="derivation"] .notebook-task-header {
  background-color: var(--phy-field-bg);
  border-bottom: 2px solid var(--phy-field);
}

[data-course="standard-physics"] .notebook-task[data-type="derivation"] .notebook-task-badge {
  background-color: var(--phy-field);
  color: white;
}

[data-course="standard-physics"] .notebook-task[data-type="flowchart"] .notebook-task-header {
  background-color: var(--phy-momentum-bg);
  border-bottom: 2px solid var(--phy-momentum);
}

[data-course="standard-physics"] .notebook-task[data-type="flowchart"] .notebook-task-badge {
  background-color: var(--phy-momentum);
  color: white;
}

/* ============================================================================
   Scientific Table Styling (Rehype AST Wrapped)
   ============================================================================ */

[data-course="standard-physics"] .table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--color-border-sub);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-canvas);
}

[data-course="standard-physics"] table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

[data-course="standard-physics"] th {
  background-color: #f1f3f5;
  color: var(--color-text-main);
  font-weight: 700;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--color-border-hard);
  border-right: 1px solid var(--color-border-sub);
}

[data-course="standard-physics"] th:last-child {
  border-right: none;
}

[data-course="standard-physics"] td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border-sub);
  border-right: 1px solid var(--color-border-sub);
}

[data-course="standard-physics"] td:last-child {
  border-right: none;
}

[data-course="standard-physics"] tbody tr:hover {
  background-color: rgba(30, 107, 35, 0.05);
}

/* ============================================================================
   Print Media Optimization (PDF Generation)
   ============================================================================ */

@media print {
  [data-course="standard-physics"] {
    --color-text-main: #000;
    --color-bg-canvas: #fff;
  }

  [data-course="standard-physics"] .notebook-task {
    page-break-inside: avoid;
    border: 1.5px solid #000;
    margin: 0.5rem 0;
  }

  [data-course="standard-physics"] .notebook-task-header {
    background-color: #f0f0f0 !important;
  }

  [data-course="standard-physics"] table {
    page-break-inside: avoid;
  }

  [data-course="standard-physics"] th {
    background-color: #e0e0e0 !important;
    border-bottom: 2px solid #000 !important;
  }

  [data-course="standard-physics"] td {
    border-bottom: 1px solid #999 !important;
  }

  [data-course="standard-physics"] .katex-display {
    page-break-inside: avoid;
  }
}