/* ===== KI-Toolbox Schulung – Stylesheet ===== */

/* CSS Custom Properties */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-secondary: #7c3aed;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-sidebar-bg: #0f172a;
  --color-sidebar-text: #cbd5e1;
  --color-sidebar-active: #2563eb;
  --color-sidebar-hover: #1e2a3b;
  --color-sidebar-border: #1e293b;
  --color-body-bg: #f1f5f9;
  --color-content-bg: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-heading: #0f172a;
  --color-code-bg: #f8fafc;
  --color-screenshot-bg: #fef3c7;
  --color-screenshot-border: #f59e0b;
  --sidebar-width: 280px;
  --topbar-height: 60px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --transition: 0.2s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  background: var(--color-body-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Top Bar ===== */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-height);
  background: var(--color-sidebar-bg);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 16px;
  z-index: 100;
  border-bottom: 1px solid var(--color-sidebar-border);
}

.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: white;
  font-size: 1rem;
  font-weight: 700;
  white-space: nowrap;
}

.topbar-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.topbar-spacer { flex: 1; }

.topbar-search {
  position: relative;
  width: 280px;
}

.topbar-search input {
  width: 100%;
  padding: 8px 16px 8px 36px;
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 20px;
  color: white;
  font-size: 0.875rem;
  outline: none;
  transition: var(--transition);
}

.topbar-search input::placeholder { color: #64748b; }
.topbar-search input:focus { border-color: var(--color-primary); background: #1e2a3b; }

.topbar-search .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: #64748b;
  font-size: 14px;
  pointer-events: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
}

/* ===== Layout ===== */
.layout {
  display: flex;
  margin-top: var(--topbar-height);
  min-height: calc(100vh - var(--topbar-height));
}

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--topbar-height));
  background: var(--color-sidebar-bg);
  overflow-y: auto;
  border-right: 1px solid var(--color-sidebar-border);
  transition: transform var(--transition);
  z-index: 90;
  scrollbar-width: thin;
  scrollbar-color: #334155 transparent;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: #334155; border-radius: 2px; }

.sidebar-nav { padding: 16px 0 40px; }

.sidebar-section-title {
  padding: 16px 20px 6px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #475569;
}

.sidebar-phase-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #94a3b8;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition);
}

.sidebar-phase-header:hover { color: #e2e8f0; }

.sidebar-phase-header .phase-badge {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #1e293b;
  color: #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar-phase-header.active .phase-badge {
  background: var(--color-primary);
  color: white;
}

.sidebar-phase-header .toggle-icon {
  margin-left: auto;
  font-size: 0.65rem;
  color: #475569;
  transition: transform var(--transition);
}

.sidebar-phase-header.open .toggle-icon { transform: rotate(180deg); }

.sidebar-items {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
}

.sidebar-items.open { max-height: 2000px; }

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px 7px 44px;
  font-size: 0.825rem;
  color: var(--color-sidebar-text);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
  line-height: 1.3;
}

.sidebar-link:hover {
  background: var(--color-sidebar-hover);
  color: #e2e8f0;
}

.sidebar-link.active {
  background: rgba(37, 99, 235, 0.15);
  color: #93c5fd;
  border-left-color: var(--color-primary);
}

.sidebar-link .link-icon {
  font-size: 0.8rem;
  width: 16px;
  flex-shrink: 0;
}

/* Sub-items (Blockly Referenz) */
.sidebar-sub-items { padding-left: 16px; }
.sidebar-sub-items .sidebar-link { padding-left: 28px; font-size: 0.78rem; }

/* ===== Main Content ===== */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 40px 48px 80px;
  max-width: calc(var(--sidebar-width) + 820px);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 28px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { color: #cbd5e1; }
.breadcrumb .current { color: var(--color-text); font-weight: 500; }

/* ===== Page Header ===== */
.page-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.phase-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.page-header .lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 600px;
}

.learning-goals {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.learning-goal-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ===== Article Content ===== */
.article h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary-light);
  scroll-margin-top: 80px;
}

.article h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-top: 28px;
  margin-bottom: 12px;
  scroll-margin-top: 80px;
}

.article h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: 20px;
  margin-bottom: 8px;
}

.article p {
  margin-bottom: 16px;
  color: var(--color-text);
}

.article ul, .article ol {
  margin: 12px 0 20px 24px;
}

.article li {
  margin-bottom: 6px;
}

.article a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.article a:hover { border-bottom-color: var(--color-primary); }

/* ===== Screenshot Placeholder ===== */
.screenshot-placeholder {
  background: var(--color-screenshot-bg);
  border: 2px dashed var(--color-screenshot-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 20px 0;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.screenshot-placeholder .screenshot-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  line-height: 1;
  margin-top: 2px;
}

.screenshot-placeholder .screenshot-body .label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #92400e;
  margin-bottom: 4px;
}

.screenshot-placeholder .screenshot-body .desc {
  font-size: 0.9rem;
  color: #78350f;
  font-weight: 500;
}

/* ===== Info Cards ===== */
.info-box, .tip-box, .warning-box, .danger-box {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius);
  margin: 20px 0;
}

.info-box { background: #eff6ff; border-left: 4px solid #3b82f6; }
.tip-box { background: #f0fdf4; border-left: 4px solid #22c55e; }
.warning-box { background: #fffbeb; border-left: 4px solid #f59e0b; }
.danger-box { background: #fef2f2; border-left: 4px solid #ef4444; }

.info-box .box-icon, .tip-box .box-icon, .warning-box .box-icon, .danger-box .box-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.info-box .box-content, .tip-box .box-content, .warning-box .box-content, .danger-box .box-content {
  flex: 1;
}

.info-box .box-title, .tip-box .box-title, .warning-box .box-title, .danger-box .box-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.info-box .box-title { color: #1e40af; }
.tip-box .box-title { color: #15803d; }
.warning-box .box-title { color: #92400e; }
.danger-box .box-title { color: #991b1b; }

.info-box p, .tip-box p, .warning-box p, .danger-box p {
  font-size: 0.9rem;
  color: var(--color-text);
  margin: 0;
}

/* ===== Tables ===== */
.table-wrapper {
  overflow-x: auto;
  margin: 20px 0;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

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

thead th {
  background: var(--color-heading);
  color: white;
  padding: 10px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

tbody tr:nth-child(even) { background: #f8fafc; }
tbody tr:hover { background: #eff6ff; }

tbody td {
  padding: 10px 16px;
  border-top: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.5;
}

tbody td code {
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  border: 1px solid var(--color-border);
}

/* ===== Steps / Numbered Instructions ===== */
.steps {
  margin: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-content { flex: 1; }

.step-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-heading);
  margin: 0 0 4px;
}

.step-content p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ===== Cards Grid ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.card {
  background: var(--color-content-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
  display: block;
}

.card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-heading);
  margin: 0 0 8px;
}

.card p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* ===== Block Docs (Blockly) ===== */
.block-card {
  background: var(--color-content-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin: 16px 0;
  overflow: hidden;
}

.block-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: #f8fafc;
  border-bottom: 1px solid var(--color-border);
}

.block-color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.block-card-header .block-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-heading);
  flex: 1;
}

.block-card-body {
  padding: 16px 20px;
}

.block-card-body .block-desc {
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: 10px;
}

.block-card-body .block-use {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.block-badge {
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-action { background: #dbeafe; color: #1e40af; }
.badge-output { background: #dcfce7; color: #15803d; }
.badge-event { background: #fce7f3; color: #9d174d; }
.badge-control { background: #fef3c7; color: #92400e; }
.badge-deprecated { background: #f3f4f6; color: #6b7280; }

/* ===== Code Blocks ===== */
.code-block {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
  margin: 16px 0;
}

.code-block .comment { color: #64748b; }
.code-block .keyword { color: #7dd3fc; }
.code-block .string { color: #86efac; }
.code-block .value { color: #fca5a5; }

/* ===== Checklist ===== */
.checklist {
  margin: 16px 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0;
  font-size: 0.875rem;
  color: var(--color-text);
  border-bottom: 1px solid #f1f5f9;
}

.checklist li:last-child { border-bottom: none; }

.checklist li::before {
  content: '☐';
  font-size: 1rem;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 1px;
}

/* ===== Comparison Table ===== */
.comparison-table th:first-child { width: 160px; }

.check-yes { color: var(--color-success); font-weight: 700; }
.check-no { color: #cbd5e1; }

/* ===== Prev / Next Navigation ===== */
.page-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 60px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.page-nav-link {
  display: flex;
  flex-direction: column;
  padding: 16px 20px;
  background: var(--color-content-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.page-nav-link:hover {
  box-shadow: var(--shadow);
  border-color: var(--color-primary);
}

.page-nav-link.next { text-align: right; }

.page-nav-link .nav-dir {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.page-nav-link.next .nav-dir { justify-content: flex-end; }

.page-nav-link .nav-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-heading);
}

/* ===== Search Results Overlay ===== */
.search-overlay {
  display: none;
  position: fixed;
  top: var(--topbar-height);
  left: 50%;
  transform: translateX(-50%);
  width: 560px;
  max-width: calc(100vw - 40px);
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  z-index: 200;
  max-height: 400px;
  overflow-y: auto;
}

.search-overlay.active { display: block; }

.search-result-item {
  display: block;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: background var(--transition);
}

.search-result-item:hover { background: #f8fafc; }
.search-result-item:last-child { border-bottom: none; }

.search-result-item .result-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 2px;
}

.search-result-item .result-phase {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.search-no-results {
  padding: 24px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* ===== Progress Bar ===== */
.reading-progress {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-border);
  z-index: 95;
}

.reading-progress-bar {
  height: 100%;
  background: var(--color-primary);
  transition: width 0.1s;
  width: 0%;
}

/* ===== Tag / Chip ===== */
.tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* ===== Do / Don't Section ===== */
.do-dont {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}

.do-box, .dont-box {
  border-radius: var(--radius);
  padding: 16px 20px;
}

.do-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
}

.dont-box {
  background: #fef2f2;
  border: 1px solid #fecaca;
}

.do-box .do-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #15803d;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.dont-box .dont-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #dc2626;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.do-box li, .dont-box li {
  font-size: 0.875rem;
  margin-bottom: 8px;
  padding-left: 4px;
  list-style: none;
}

/* ===== Exercises ===== */
.exercise-box {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bae6fd;
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 32px 0;
}

.exercise-box .exercise-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #0284c7;
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.exercise-box h3 {
  margin: 0 0 12px;
  color: #0c4a6e;
  font-size: 1.05rem;
}

.exercise-box p {
  font-size: 0.875rem;
  color: #0369a1;
  margin: 0 0 12px;
}

.exercise-box ol, .exercise-box ul {
  font-size: 0.875rem;
  color: #0369a1;
  margin: 0 0 0 20px;
}

.exercise-box li { margin-bottom: 6px; }

/* ===== Hero / Landing Page ===== */
.hero {
  text-align: center;
  padding: 60px 20px 40px;
  max-width: 700px;
  margin: 0 auto 48px;
}

.hero .hero-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  display: block;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--color-primary);
  color: white;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: background var(--transition), transform var(--transition);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.hero-cta:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

/* ===== Phase Overview Cards (Homepage) ===== */
.phase-overview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 32px 0;
}

.phase-card {
  background: var(--color-content-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  transition: box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.phase-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.phase-card .phase-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  margin-bottom: 14px;
}

.phase-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-heading);
  margin: 0 0 8px;
}

.phase-card p {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  margin: 0 0 14px;
  line-height: 1.5;
}

.phase-card .phase-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.phase-card .phase-module-chip {
  font-size: 0.72rem;
  padding: 3px 8px;
  background: #f1f5f9;
  color: #475569;
  border-radius: 4px;
}

/* ===== Sidebar Overlay (Mobile) ===== */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 85;
}

.sidebar-backdrop.active { display: block; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .main-content { padding: 32px 28px 60px; }
  .phase-overview { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    z-index: 95;
  }

  .sidebar.open { transform: translateX(0); }

  .menu-toggle { display: block; }

  .main-content {
    margin-left: 0;
    padding: 24px 20px 60px;
  }

  .topbar-search { display: none; }

  .page-nav { grid-template-columns: 1fr; }

  .do-dont { grid-template-columns: 1fr; }

  .hero h1 { font-size: 1.8rem; }
}

/* ===== Print ===== */
@media print {
  .sidebar, .topbar, .page-nav, .reading-progress { display: none; }
  .main-content { margin: 0; padding: 20px; }
  .screenshot-placeholder { border-style: solid; }
}