/* ==========================================================================
   MARC-diffSerials Modern Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Outfit:wght@500;600;700;800&family=Noto+Sans+JP:wght@400;500;600;700&display=swap');

:root {
  /* Color Tokens - Light Mode */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.85);
  
  --border-subtle: #e2e8f0;
  --border-focus: #6366f1;
  --border-strong: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #e0e7ff;
  --primary-glow: rgba(79, 70, 229, 0.2);

  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-emerald-light: #d1fae5;
  --accent-amber: #f59e0b;
  --accent-amber-light: #fef3c7;
  --accent-rose: #f43f5e;
  --accent-rose-light: #ffe4e6;
  --accent-purple: #8b5cf6;

  --lib-a-color: #0284c7;
  --lib-a-bg: #e0f2fe;
  --lib-b-color: #059669;
  --lib-b-bg: #d1fae5;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Outfit', 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, Menlo, monospace;
}

[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --bg-glass: rgba(17, 24, 39, 0.85);

  --border-subtle: #1f2937;
  --border-focus: #818cf8;
  --border-strong: #374151;

  --text-primary: #f9fafb;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0b0f19;

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #1e1b4b;
  --primary-glow: rgba(99, 102, 241, 0.3);

  --accent-cyan: #22d3ee;
  --accent-emerald: #34d399;
  --accent-emerald-light: #064e3b;
  --accent-amber: #fbbf24;
  --accent-amber-light: #78350f;
  --accent-rose: #fb7185;
  --accent-rose-light: #881337;

  --lib-a-color: #38bdf8;
  --lib-a-bg: #082f49;
  --lib-b-color: #34d399;
  --lib-b-bg: #064e3b;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Background Subtle Glow Gradient */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 480px;
  background: radial-gradient(circle at 50% -10%, var(--primary-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.main-content {
  flex: 1;
  padding: 2rem 0 4rem;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px var(--primary-glow);
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  letter-spacing: 0.05em;
  margin-left: 0.35rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.925rem;
  color: var(--text-secondary);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  text-decoration: none;
}

.nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.1rem;
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding: 2.5rem 0 2rem;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-family: var(--font-sans);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 1.5rem;
}

.hero-features {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1rem;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-feature-item svg {
  color: var(--accent-emerald);
}

/* ==========================================================================
   Cards & Panels
   ========================================================================== */

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.75rem;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-strong);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
}

.card-title {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ==========================================================================
   Form Controls
   ========================================================================== */

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-label-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-hint {
  font-size: 0.825rem;
  color: var(--text-muted);
  font-weight: 400;
}

.tag-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.tag-badge.lib-a {
  background: var(--lib-a-bg);
  color: var(--lib-a-color);
}

.tag-badge.lib-b {
  background: var(--lib-b-bg);
  color: var(--lib-b-color);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg-secondary);
}

textarea.form-control {
  min-height: 85px;
  resize: vertical;
  line-height: 1.5;
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-weight: 500;
  transition: color 0.2s ease;
  letter-spacing: 0.02em;
}

.char-count.warn {
  color: var(--accent-amber);
  font-weight: 600;
}

.char-count.max {
  color: var(--accent-rose);
  font-weight: 700;
}

.input-examples {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.example-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
}

.example-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  color: white;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-primary:hover {
  filter: brightness(1.08);
  box-shadow: 0 6px 16px var(--primary-glow);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: var(--border-subtle);
  border-color: var(--border-strong);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary-light);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Function Selector Tabs / Select
   ========================================================================== */

.function-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.function-card {
  border: 2px solid var(--border-subtle);
  background: var(--bg-tertiary);
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.function-card:hover {
  border-color: var(--border-focus);
  background: var(--bg-secondary);
}

.function-card.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.function-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.function-card-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.function-card.active .function-card-name {
  color: var(--primary);
}

.function-card-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.function-card-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================================================
   Results Presentation
   ========================================================================== */

.result-box {
  background: var(--bg-secondary);
  border: 2px solid var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-top: 1.5rem;
  box-shadow: var(--shadow-lg);
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.result-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.result-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
}

.result-badge.success {
  background: var(--accent-emerald-light);
  color: var(--accent-emerald);
}

.result-badge.empty {
  background: var(--bg-tertiary);
  color: var(--text-muted);
}

.result-badge.error {
  background: var(--accent-rose-light);
  color: var(--accent-rose);
}

.result-display {
  padding: 1.5rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-strong);
  text-align: center;
  margin-bottom: 1.25rem;
}

.result-value {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.03em;
  word-break: break-all;
}

.result-empty {
  color: var(--text-muted);
  font-style: italic;
  font-size: 1.1rem;
}

/* Visualization Timeline Bar */
.viz-container {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
}

.viz-title {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.viz-legend {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
  font-size: 0.8rem;
}

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

.viz-legend-color {
  width: 14px;
  height: 14px;
  border-radius: 3px;
}

.viz-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.viz-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: center;
  gap: 1rem;
}

.viz-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.viz-track {
  display: flex;
  height: 28px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  position: relative;
}

.viz-block {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: white;
  transition: var(--transition);
  cursor: default;
  border-right: 1px solid rgba(255,255,255,0.2);
}

.viz-block:hover {
  filter: brightness(1.15);
  transform: scaleY(1.08);
  z-index: 2;
}

.viz-block.lib-a { background: var(--lib-a-color); }
.viz-block.lib-b { background: var(--lib-b-color); }
.viz-block.filled { background: var(--accent-amber); color: #000; font-weight: 700; }
.viz-block.lack { background: var(--accent-rose); }
.viz-block.empty { background: transparent; }

/* All-in-One Multi-Function Table */
.multi-results-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.9rem;
}

.multi-results-table th,
.multi-results-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.multi-results-table th {
  background: var(--bg-tertiary);
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-secondary);
}

.multi-results-table td.func-name {
  font-weight: 600;
  color: var(--text-primary);
  width: 35%;
}

.multi-results-table td.func-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--primary);
}

/* ==========================================================================
   Matching Page Specifics (Two Columns / TSV Editor)
   ========================================================================== */

.matching-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 860px) {
  .matching-grid {
    grid-template-columns: 1fr;
  }
}

.editor-box {
  display: flex;
  flex-direction: column;
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

textarea.editor-textarea {
  min-height: 280px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre;
  overflow-x: auto;
}

.drop-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  text-align: center;
  font-size: 0.825rem;
  color: var(--text-muted);
  cursor: pointer;
  margin-top: 0.5rem;
  transition: var(--transition);
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

/* Matching Statistics */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.stat-icon.total { background: var(--primary-light); color: var(--primary); }
.stat-icon.transfer { background: var(--accent-emerald-light); color: var(--accent-emerald); }
.stat-icon.new { background: var(--lib-a-bg); color: var(--lib-a-color); }
.stat-icon.warning { background: var(--accent-rose-light); color: var(--accent-rose); }

.stat-content {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Interactive Result Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  margin-top: 1rem;
}

.result-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.result-data-table th,
.result-data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.result-data-table th {
  background: var(--bg-tertiary);
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-secondary);
  position: sticky;
  top: 0;
}

.result-data-table tbody tr:hover {
  background: var(--bg-tertiary);
}

.mono-cell {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.status-chip.success { background: var(--accent-emerald-light); color: var(--accent-emerald); }
.status-chip.new { background: var(--lib-a-bg); color: var(--lib-a-color); }
.status-chip.none { background: var(--bg-tertiary); color: var(--text-muted); }
.status-chip.error { background: var(--accent-rose-light); color: var(--accent-rose); }

/* Excel Guidance Box */
.guidance-box {
  background: var(--bg-tertiary);
  border-left: 4px solid var(--accent-emerald);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: 1.5rem;
}

.guidance-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.guidance-list {
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.guidance-list li {
  margin-bottom: 0.25rem;
}

/* Modal / Image Viewer */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 1.5rem;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  padding: 1.5rem;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--bg-tertiary);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--text-muted);
}

.modal-close:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Documentation / API Reference Section
   ========================================================================== */

.doc-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.doc-title {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.doc-code-block {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  overflow-x: auto;
  margin: 1rem 0;
  position: relative;
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.doc-table th, .doc-table td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.doc-table th {
  background: var(--bg-tertiary);
  font-weight: 600;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 0 2rem;
  margin-top: auto;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--primary);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--primary);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  animation: slideInRight 0.25s ease-out;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .navbar .container {
    padding: 0 1rem;
  }
  .nav-link span {
    display: none;
  }
}