/* ================================================
   ĐẠO PHẬT LEARNING SYSTEM — Shared Styles
   ================================================ */

:root {
  /* Colors */
  --bg-primary: #0a0a12;
  --bg-secondary: #111120;
  --bg-card: #16162a;
  --bg-card-hover: #1e1e38;
  --border: #2a2a45;

  /* Brand */
  --gold: #D4AF37;
  --gold-light: #f0d060;
  --saffron: #E67E22;
  --lotus: #E91E63;
  --dharma: #4A90D9;
  --wisdom: #9B59B6;
  --liberation: #27AE60;

  /* Text */
  --text: #E8DCC8;
  --text-muted: #7a7a9a;
  --text-bright: #ffffff;

  /* Level Colors */
  --l0: #3498DB;
  --l1: #E67E22;
  --l2: #27AE60;
  --l3: #9B59B6;
  --l4: #E91E63;
  --l5: #D4AF37;

  /* Layout */
  --sidebar-w: 260px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
}

/* ── Light mode overrides ── */
[data-theme="light"] {
  --bg-primary: #f0ebe0;
  --bg-secondary: #e6dfd0;
  --bg-card: #ffffff;
  --bg-card-hover: #f8f4ed;
  --border: #c8bfa8;
  --text: #2a1f10;
  --text-muted: #6b5a42;
  --text-bright: #0a0510;
  --gold: #8B6914;
  --gold-light: #a07820;
}
[data-theme="light"] .sidebar {
  background: #e6dfd0;
  border-right-color: #c8bfa8;
}
[data-theme="light"] .hero {
  background: linear-gradient(135deg, #e8e0cc 0%, #d4c9b0 50%, #ddd5c0 100%);
}
[data-theme="light"] .hero::before {
  background: radial-gradient(ellipse at 50% 0%, rgba(139,105,20,0.1) 0%, transparent 60%);
}
[data-theme="light"] .hero h1 {
  background: linear-gradient(135deg, #8B6914, #c07820);
  -webkit-background-clip: text;
  background-clip: text;
}
[data-theme="light"] .sidebar-header h2 { color: #8B6914; }
[data-theme="light"] .philosophy-card,
[data-theme="light"] .card { box-shadow: 0 2px 8px rgba(0,0,0,.06); }
[data-theme="light"] .matrix-container { border-color: #c8bfa8; }
[data-theme="light"] .mindmap-container,
[data-theme="light"] .dep-graph-container { background: #e6dfd0; }

/* ── Theme toggle button ── */
.theme-toggle {
  position: fixed;
  top: 14px;
  right: 16px;
  z-index: 200;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.theme-toggle:hover {
  border-color: var(--gold);
  transform: scale(1.1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

/* ── Sidebar ── */
.sidebar {
  position: fixed; top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-header {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.sidebar-logo { font-size: 40px; margin-bottom: 8px; }
.sidebar-header h2 {
  color: var(--gold);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
}
.sidebar-header p { color: var(--text-muted); font-size: 12px; margin-top: 4px; }

.sidebar-section { padding: 16px 16px 8px; }
.sidebar-section h4 {
  color: var(--text-muted);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
  padding: 0 4px;
}
.sidebar-nav, .sidebar-section ul { list-style: none; }
.sidebar-nav { padding: 12px 16px; border-bottom: 1px solid var(--border); }
.sidebar-nav li a,
.sidebar-section ul li a {
  display: block;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
}
.sidebar-nav li a:hover,
.sidebar-section ul li a:hover {
  background: var(--bg-card);
  color: var(--gold);
}
.sidebar-nav li a.active { background: var(--bg-card); color: var(--gold); }

/* Level links in sidebar */
.level-link { font-size: 12px !important; }
.level-link.l0 { border-left: 3px solid var(--l0); padding-left: 8px !important; }
.level-link.l1 { border-left: 3px solid var(--l1); padding-left: 8px !important; }
.level-link.l2 { border-left: 3px solid var(--l2); padding-left: 8px !important; }
.level-link.l3 { border-left: 3px solid var(--l3); padding-left: 8px !important; }
.level-link.l4 { border-left: 3px solid var(--l4); padding-left: 8px !important; }
.level-link.l5 { border-left: 3px solid var(--l5); padding-left: 8px !important; }

/* ── Main Content ── */
.main-content {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
}

/* ── Section ── */
.section {
  padding: 60px 48px;
  border-bottom: 1px solid var(--border);
  max-width: 1100px;
}
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 8px;
}
.section-subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 36px;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--gold);
  transform: translateY(-2px);
}

/* ── Tags / Badges ── */
.tag {
  display: inline-block;
  background: rgba(212,175,55,0.15);
  color: var(--gold);
  border: 1px solid rgba(212,175,55,0.3);
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
}
.badge {
  display: inline-block;
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Level badges */
.badge-l0 { background: rgba(52,152,219,0.2); color: var(--l0); border: 1px solid var(--l0); }
.badge-l1 { background: rgba(230,126,34,0.2); color: var(--l1); border: 1px solid var(--l1); }
.badge-l2 { background: rgba(39,174,96,0.2); color: var(--l2); border: 1px solid var(--l2); }
.badge-l3 { background: rgba(155,89,182,0.2); color: var(--l3); border: 1px solid var(--l3); }
.badge-l4 { background: rgba(233,30,99,0.2); color: var(--l4); border: 1px solid var(--l4); }
.badge-l5 { background: rgba(212,175,55,0.2); color: var(--l5); border: 1px solid var(--l5); }

/* ── Table ── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  background: var(--bg-secondary);
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 1px;
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
}
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.data-table tr:hover td { background: var(--bg-card); }

/* ── Dot indicators ── */
.dot {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 50%;
  margin: 0 auto;
}
.dot-l0 { background: var(--l0); box-shadow: 0 0 6px var(--l0); }
.dot-l1 { background: var(--l1); box-shadow: 0 0 6px var(--l1); }
.dot-l2 { background: var(--l2); box-shadow: 0 0 6px var(--l2); }
.dot-l3 { background: var(--l3); box-shadow: 0 0 6px var(--l3); }
.dot-l4 { background: var(--l4); box-shadow: 0 0 6px var(--l4); }
.dot-l5 { background: var(--l5); box-shadow: 0 0 6px var(--l5); }
.dot-outline {
  background: transparent;
  border: 1px dashed var(--border);
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #0a0a12 0%, #1a0a2e 50%, #0a1220 100%);
  padding: 80px 48px 60px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(212,175,55,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content { position: relative; max-width: 700px; }
.dharma-wheel {
  font-size: 64px;
  display: block;
  margin-bottom: 20px;
  animation: spin 30s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.hero h1 {
  font-size: 40px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gold), var(--saffron));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  line-height: 1.2;
}
.hero-subtitle { color: var(--text-muted); font-size: 16px; margin-bottom: 24px; }
.hero-tags { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Philosophy grid ── */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 8px;
}
.philosophy-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}
.philosophy-card:hover { border-color: var(--gold); }
.phi-icon { font-size: 28px; margin-bottom: 10px; }
.philosophy-card h3 { color: var(--gold); font-size: 15px; margin-bottom: 6px; }
.philosophy-card p { color: var(--text-muted); font-size: 13px; line-height: 1.6; }
.philosophy-card em { color: var(--saffron); font-style: italic; }

/* ── Timeline / Level roadmap ── */
.timeline { position: relative; padding: 12px 0; }
.timeline::before {
  content: '';
  position: absolute;
  left: 40px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--l0), var(--l1), var(--l2), var(--l3), var(--l4), var(--l5));
}
.timeline-item {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  position: relative;
}
.timeline-dot {
  width: 22px; height: 22px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-left: 30px;
  margin-top: 4px;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 12px currentColor;
  border: 2px solid var(--bg-primary);
}
.timeline-card {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: var(--transition);
  cursor: pointer;
}
.timeline-card:hover { background: var(--bg-card-hover); transform: translateX(4px); }
.timeline-card.active { border-color: var(--gold); }
.level-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.level-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.level-title { font-size: 17px; font-weight: 700; }
.level-time { color: var(--text-muted); font-size: 12px; margin-left: auto; }
.level-desc { color: var(--text-muted); font-size: 13px; margin-bottom: 12px; }
.concept-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.concept-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid;
  opacity: 0.9;
  cursor: pointer;
  transition: var(--transition);
}
.concept-tag:hover { opacity: 1; transform: scale(1.05); }
.output-box {
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
}
.output-box strong { color: var(--gold); font-size: 11px; letter-spacing: 1px; text-transform: uppercase; display: block; margin-bottom: 4px; }
.output-box p { color: var(--text); margin: 0; }

/* ── Logic Flow ── */
.logic-flow { margin-top: 16px; }
.logic-step {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left: 4px solid;
  transition: var(--transition);
}
.logic-step:hover { background: var(--bg-card-hover); }
.logic-num {
  font-size: 24px;
  font-weight: 900;
  opacity: 0.3;
  flex-shrink: 0;
  width: 36px;
}
.logic-content h4 { font-size: 14px; margin-bottom: 6px; }
.logic-content p { font-size: 13px; color: var(--text-muted); margin: 0; }
.logic-content .arrow { color: var(--gold); font-weight: 700; }

/* ── Concept Matrix Table ── */
.matrix-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}
.matrix-table th {
  background: var(--bg-secondary);
  padding: 12px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-muted);
  text-transform: uppercase;
}
.matrix-table th.concept-col { text-align: left; min-width: 200px; }
.matrix-table td {
  padding: 8px 16px;
  border-bottom: 1px solid rgba(42,42,69,0.5);
  border-right: 1px solid rgba(42,42,69,0.3);
  text-align: center;
  vertical-align: middle;
}
.matrix-table td.concept-name {
  text-align: left;
  font-size: 13px;
  color: var(--text);
}
.matrix-table td.group-name {
  color: var(--text-muted);
  font-size: 11px;
  text-align: left;
}
.matrix-table tr:hover td { background: rgba(212,175,55,0.04); }
.matrix-table tr.group-header td {
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 700;
  padding: 6px 16px;
}

/* Filter buttons */
.filter-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--bg-card-hover);
  color: var(--text);
  border-color: var(--gold);
}
.filter-btn.active { color: var(--gold); }

/* ── Mindmap ── */
.mindmap-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}
.mindmap-container svg { display: block; width: 100%; }
.mindmap-legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 12px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-muted); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* ── Dep graph ── */
.dep-graph-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  overflow: auto;
}
.dep-graph-container svg { display: block; margin: 0 auto; }

/* ── Tooltips ── */
.tooltip {
  position: fixed;
  background: var(--bg-card);
  border: 1px solid var(--gold);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text);
  pointer-events: none;
  z-index: 1000;
  max-width: 220px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  opacity: 0;
  transition: opacity 0.15s;
}
.tooltip.show { opacity: 1; }
.tooltip-title { color: var(--gold); font-weight: 700; margin-bottom: 4px; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); transition: var(--transition); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .section { padding: 40px 24px; }
  .philosophy-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 24px 40px; }
  .hero h1 { font-size: 28px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }