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

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-sidebar: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent: #d97706;
  --accent2: #b45309;
  --accent-glow: rgba(217, 119, 6, 0.15);
  --accent-blue: #2563eb;
  --accent-green: #16a34a;
  --accent-purple: #9333ea;
  --accent-red: #dc2626;
  --border: #e2e8f0;
  --border-light: #cbd5e1;
  --sidebar-width: 300px;
  --topbar-height: 64px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

/* ─── Top Bar ─── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--topbar-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 24px;
  z-index: 1000;
}
.topbar-brand {
  display: flex; align-items: center; gap: 12px;
  font-weight: 700; font-size: 16px;
  color: var(--accent);
}
.topbar-brand span { font-size: 22px; }
.topbar-title {
  margin-left: auto;
  font-size: 13px; color: var(--text-muted);
  font-weight: 400;
}
.menu-toggle {
  display: none;
  background: none; border: none; color: var(--text-primary);
  font-size: 24px; cursor: pointer; padding: 4px 8px;
  margin-right: 12px;
}

/* ─── Sidebar ─── */
.sidebar {
  position: fixed; top: var(--topbar-height); left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--topbar-height));
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px 0;
  z-index: 900;
  transition: transform 0.3s ease;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.nav-section {
  padding: 8px 20px 4px;
  font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-top: 12px;
}
.nav-section:first-child { margin-top: 0; }
.nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 20px;
  font-size: 13px; color: var(--text-secondary);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
  cursor: pointer;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(0,0,0,0.03);
  border-left-color: var(--border-light);
}
.nav-link.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-left-color: var(--accent);
  font-weight: 500;
}
.nav-link .nav-badge {
  margin-left: auto;
  font-size: 10px; font-weight: 600;
  padding: 2px 6px; border-radius: 4px;
  background: var(--bg-card);
  color: var(--text-muted);
}
.nav-link .nav-icon { font-size: 16px; flex-shrink: 0; }

/* ─── Main Content ─── */
.main {
  margin-left: var(--sidebar-width);
  margin-top: var(--topbar-height);
  min-height: calc(100vh - var(--topbar-height));
}
.content {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 32px 80px;
}

/* ─── Sections ─── */
.section { display: none; }
.section.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ─── Typography ─── */
h1 {
  font-size: 32px; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-bottom: 8px; line-height: 1.2;
}
h2 {
  font-size: 24px; font-weight: 700;
  color: var(--text-primary);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
h3 {
  font-size: 18px; font-weight: 600;
  color: var(--accent);
  margin: 28px 0 12px;
}
h4 {
  font-size: 15px; font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 8px;
}
.subtitle {
  font-size: 16px; color: var(--text-secondary);
  margin-bottom: 32px; font-weight: 400;
}
p { margin: 12px 0; color: var(--text-secondary); }
strong { color: var(--text-primary); font-weight: 600; }
em { color: var(--accent); font-style: italic; }

/* ─── Lists ─── */
ul, ol { margin: 12px 0 12px 24px; color: var(--text-secondary); }
li { margin: 6px 0; }
li::marker { color: var(--accent); }

/* ─── Tables ─── */
table {
  width: 100%; border-collapse: collapse;
  margin: 16px 0; font-size: 14px;
}
th {
  text-align: left; padding: 10px 14px;
  background: var(--bg-card);
  color: var(--accent); font-weight: 600;
  border: 1px solid var(--border);
  font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.5px;
}
td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
tr:hover td { background: rgba(0,0,0,0.02); }

/* ─── Code / Tree ─── */
pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--text-secondary);
  margin: 16px 0;
  line-height: 1.6;
}
code {
  font-family: 'JetBrains Mono', monospace;
  background: var(--bg-card);
  padding: 2px 6px; border-radius: 4px;
  font-size: 13px; color: var(--accent);
}

/* ─── Callout Boxes ─── */
.callout {
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0;
  border-left: 4px solid;
  font-size: 14px;
}
.callout-tip {
  background: rgba(34, 197, 94, 0.08);
  border-color: var(--accent-green);
  color: var(--text-secondary);
}
.callout-tip strong { color: var(--accent-green); }
.callout-note {
  background: rgba(59, 130, 246, 0.08);
  border-color: var(--accent-blue);
}
.callout-note strong { color: var(--accent-blue); }
.callout-warning {
  background: rgba(245, 158, 11, 0.08);
  border-color: var(--accent);
}
.callout-warning strong { color: var(--accent); }
.callout-scene {
  background: rgba(168, 85, 247, 0.06);
  border-color: var(--accent-purple);
}
.callout-scene strong { color: var(--accent-purple); }

/* ─── Script Scene Cards ─── */
.scene-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 20px 0;
  transition: border-color 0.2s;
}
.scene-card:hover { border-color: var(--border-light); }
.scene-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 12px;
}
.scene-num {
  background: var(--accent);
  color: #000; font-weight: 700;
  font-size: 11px;
  padding: 3px 8px; border-radius: 4px;
}
.scene-title {
  font-size: 16px; font-weight: 600;
  color: var(--text-primary);
}
.scene-time {
  margin-left: auto;
  font-size: 12px; color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}
.visual-tag {
  display: inline-block;
  background: rgba(168, 85, 247, 0.12);
  color: var(--accent-purple);
  font-size: 12px; font-weight: 500;
  padding: 4px 10px; border-radius: 4px;
  margin-bottom: 10px;
  font-family: 'JetBrains Mono', monospace;
}
.scene-body { color: var(--text-secondary); line-height: 1.8; }
.scene-body p { margin: 10px 0; }

/* ─── Hero Section ─── */
.hero {
  text-align: center;
  padding: 60px 20px 40px;
}
.hero h1 { font-size: 38px; margin-bottom: 12px; }
.hero .subtitle { font-size: 18px; max-width: 600px; margin: 0 auto 24px; }
.hero-stats {
  display: flex; justify-content: center; gap: 32px;
  flex-wrap: wrap; margin-top: 24px;
}
.stat {
  text-align: center;
}
.stat-num {
  font-size: 28px; font-weight: 800;
  color: var(--accent);
}
.stat-label {
  font-size: 12px; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 1px;
  margin-top: 2px;
}

/* ─── Unit Header Cards ─── */
.unit-header {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-card-hover));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 20px 0;
}
.unit-tag {
  display: inline-block;
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  padding: 4px 10px; border-radius: 4px;
  margin-bottom: 8px;
}
.tag-u1 { background: rgba(59,130,246,0.15); color: var(--accent-blue); }
.tag-u2 { background: rgba(34,197,94,0.15); color: var(--accent-green); }
.tag-u3 { background: rgba(168,85,247,0.15); color: var(--accent-purple); }
.tag-u4 { background: rgba(245,158,11,0.15); color: var(--accent); }

/* ─── Checklist ─── */
.checklist { list-style: none; margin-left: 0; }
.checklist li { padding: 4px 0; }
.checklist li::before {
  content: '☐'; margin-right: 8px;
  color: var(--accent); font-size: 14px;
}

/* ─── Divider ─── */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

/* ─── Print ─── */
.print-btn {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--accent);
  color: #fff; border: none;
  padding: 14px 24px; border-radius: 50px;
  font-weight: 600; font-size: 15px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(217,119,6,0.3);
  z-index: 1100;
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex; align-items: center; gap: 8px;
}
.print-btn:hover { transform: scale(1.05); box-shadow: 0 12px 28px rgba(217,119,6,0.4); }

/* ─── Back to Top ─── */
.back-top {
  display: inline-block;
  margin-top: 20px;
  font-size: 13px;
  color: var(--accent);
  cursor: pointer;
  text-decoration: none;
}
.back-top:hover { text-decoration: underline; }

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .menu-toggle { display: block; }
  .content { padding: 24px 16px 80px; }
  h1 { font-size: 26px; }
  h2 { font-size: 20px; }
  .hero h1 { font-size: 28px; }
  .hero-stats { gap: 20px; }
  table { font-size: 12px; }
  th, td { padding: 8px 10px; }
}
@media (max-width: 500px) {
  .hero-stats { flex-direction: column; gap: 12px; }
  .scene-header { flex-wrap: wrap; }
  .scene-time { margin-left: 0; margin-top: 4px; width: 100%; }
}

@media print {
  @page { margin: 20mm; }
  .sidebar, .topbar, .menu-toggle, .print-btn { display: none !important; }
  
  body { 
    background: #fff !important; 
    color: #000 !important; 
    font-size: 11pt !important; 
    line-height: 1.5 !important;
  }
  
  .main { margin-left: 0 !important; margin-top: 0 !important; }
  .content { padding: 0 !important; max-width: 100% !important; }
  
  .section { 
    display: none !important; 
  }
  .section.active { display: block !important; page-break-before: auto; }
  .section#home { page-break-before: avoid; }
  
  h1, h2, h3, h4, h5, h6 { 
    color: #000 !important; 
    page-break-after: avoid; 
    page-break-inside: avoid;
  }
  h1 {
    font-size: 24pt !important;
    background: none !important;
    -webkit-text-fill-color: #000 !important;
    border-bottom: 2px solid #000 !important;
    padding-bottom: 8px !important;
    margin-bottom: 16px !important;
  }
  h2 { font-size: 18pt !important; border-bottom: 1px solid #ccc !important; }
  h3 { font-size: 14pt !important; margin-top: 16px !important; }
  
  p, li, td, th { color: #222 !important; orphans: 3; widows: 3; }
  
  table, pre, .callout, .scene-card, .unit-header { 
    page-break-inside: avoid !important; 
    border: 1px solid #aaa !important; 
    background: #fff !important;
  }
  
  .unit-header {
    padding: 16px !important;
    margin: 16px 0 !important;
  }

  .scene-card { 
    padding: 16px !important; 
    margin: 16px 0 !important; 
    border-radius: 4px !important;
  }
  
  .scene-header { border-bottom: 1px solid #ccc !important; padding-bottom: 8px !important; margin-bottom: 12px !important; }
  
  .scene-num, .visual-tag, .tag-u1, .tag-u2, .tag-u3, .tag-u4 {
    background: #eee !important;
    color: #333 !important;
    border: 1px solid #ccc !important;
  }
  
  th { background: #f5f5f5 !important; color: #000 !important; border: 1px solid #aaa !important; }
  td { border: 1px solid #aaa !important; }
  
  a { text-decoration: none !important; color: #000 !important; }
  .back-top { display: none !important; }
  
  .hero { padding: 0 !important; text-align: left !important; page-break-after: avoid; }
  .hero-stats { justify-content: flex-start !important; }
  .stat { text-align: left !important; }
}

/* ─── Video Space ─── */
.video-wrapper {
  margin: 32px 0 40px;
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  border: 1px solid var(--border);
  position: relative;
}
.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  width: 100%;
  background: #0f172a;
}
.video-placeholder {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(15,23,42,0.85), rgba(30,41,59,0.95)), url('https://images.unsplash.com/photo-1550684848-fac1c5b4e853?q=80&w=1000&auto=format&fit=crop') center/cover;
  background-blend-mode: overlay;
}
.play-icon {
  width: 72px; height: 72px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 30px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  margin-bottom: 20px;
  padding-left: 6px;
}
.play-icon:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.1);
  box-shadow: 0 0 30px var(--accent-glow);
  color: white;
}
.video-info {
  color: white;
  text-align: center;
  z-index: 10;
}
.video-info h3 { margin: 0 0 8px; color: white; display: flex; align-items: center; justify-content: center; gap: 8px; font-size: 20px; font-weight: 700; text-shadow: 0 2px 4px rgba(0,0,0,0.5); }
.video-info h3 span { background: var(--accent); color: white; font-size: 11px; padding: 4px 8px; border-radius: 6px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; text-shadow: none; box-shadow: 0 4px 10px rgba(217,119,6,0.3); }
.video-info p { margin: 0; color: #cbd5e1; font-size: 14px; font-weight: 500; }

/* ─── Update Logs ─── */
.update-logs {
  margin: 32px 0;
}
.update-log-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.update-log-item:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.1);
}
.log-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}
.log-title {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  flex: 1;
}
.log-time {
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  margin-left: 16px;
}
.log-status {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  margin-left: auto;
  margin-bottom: 12px;
}
.status-waiting {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent);
}
.status-in-progress {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
}
.status-completed {
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent-green);
}
.log-progress {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.log-details {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}