@import url('theme.css');
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ══════════════════════════════════════════
   RESET & BASE
══════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
/* Fix: CSS display rules override [hidden] attribute without this */
[hidden] { display: none !important; }

html { font-size: 15px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
img { max-width: 100%; }

/* ══════════════════════════════════════════
   SCROLLBAR
══════════════════════════════════════════ */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ══════════════════════════════════════════
   UTILITIES
══════════════════════════════════════════ */
.gradient-text {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ══════════════════════════════════════════
   ANIMATIONS
══════════════════════════════════════════ */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(1.35); }
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(79,172,222,0.5); }
  50%       { box-shadow: 0 0 0 6px rgba(79,172,222,0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.6; }
  50%       { opacity: 1; }
}

/* ══════════════════════════════════════════
   HEADER
══════════════════════════════════════════ */
.header {
  position: sticky; top: 0; z-index: 100;
  height: 56px;
  display: flex; align-items: center; gap: 14px;
  padding: 0 28px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-logo {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-heading);
  font-weight: 700; font-size: 16px;
  white-space: nowrap;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.skull {
  font-size: 20px;
  -webkit-text-fill-color: initial;
}

.header-divider { width: 1px; height: 20px; background: var(--border); flex-shrink: 0; }

.header-nav { display: flex; gap: 2px; flex: 1; }
.header-nav a {
  padding: 5px 14px;
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition);
}
.header-nav a::after {
  content: '';
  position: absolute; bottom: 0; left: 14px; right: 14px;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px 2px 0 0;
  opacity: 0;
  transition: opacity var(--transition);
}
.header-nav a:hover { color: var(--text); }
.header-nav a.active { color: var(--accent); }
.header-nav a.active::after { opacity: 1; }

.header-right { display: flex; align-items: center; gap: 8px; margin-left: auto; }

.theme-toggle {
  width: 34px; height: 34px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
  color: var(--text);
}
.theme-toggle:hover { background: var(--bg-card); border-color: var(--border-hover); }

.header-btn {
  padding: 6px 15px;
  font-size: 13px; font-weight: 500;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition);
}
.header-btn:hover { color: var(--text); border-color: var(--border-hover); }

/* sidebar mode bar in header */
.sidebar-mode-bar {
  display: flex; gap: 2px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 3px;
}
.mode-btn {
  padding: 3px 11px; border: none; background: transparent;
  border-radius: var(--radius-sm); font-size: 12px; font-weight: 500;
  color: var(--text-secondary); cursor: pointer;
  transition: all var(--transition);
}
.mode-btn.active { background: var(--accent); color: #fff; }
.mode-btn:not(.active):hover { color: var(--text); }

/* ══════════════════════════════════════════
   HOME PAGE LAYOUT
══════════════════════════════════════════ */
.home-wrap { max-width: 1200px; margin: 0 auto; padding: 0 28px 100px; }

/* ── HERO ── */
.hero {
  text-align: center;
  padding: 104px 16px 72px;
  position: relative;
  overflow: hidden;
}

/* Animated dot grid background */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, var(--dot-grid-color) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* Radial fade mask over dot grid */
.hero::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 50%, transparent 40%, var(--bg) 100%);
  pointer-events: none;
  z-index: 1;
}

.hero > * { position: relative; z-index: 2; }

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.8px; text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(79,172,222,0.22);
  padding: 5px 16px; border-radius: 999px;
  margin-bottom: 32px;
  animation: fadeInUp 0.5s ease both;
}

.pulse-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent2);
  display: inline-block;
  animation: pulse 2s infinite, pulse-dot 2s infinite;
  flex-shrink: 0;
}

/* legacy .dot support */
.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent2);
  display: inline-block;
  animation: pulse 2s infinite;
  flex-shrink: 0;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(42px, 7.5vw, 76px);
  font-weight: 800; letter-spacing: -2.5px; line-height: 1.04;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 60%, #76e4f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 24px;
  animation: fadeInUp 0.5s 0.1s ease both;
}

.hero-sub {
  max-width: 580px; margin: 0 auto 40px;
  font-size: 17px; color: var(--text-secondary); line-height: 1.75;
  animation: fadeInUp 0.5s 0.2s ease both;
}

.hero-cta {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 24px;
  animation: fadeInUp 0.5s 0.3s ease both;
}

.btn-primary {
  padding: 13px 30px;
  background: var(--accent);
  color: #fff; font-weight: 600; font-size: 15px;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 24px var(--accent-glow);
  transition: all var(--transition);
  border: none; cursor: pointer;
}
.btn-primary:hover {
  background: var(--accent-hover); color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.btn-ghost {
  padding: 13px 30px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary); font-weight: 600; font-size: 15px;
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  cursor: pointer;
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text);
  background: var(--bg-elevated);
  transform: translateY(-2px);
}

.hero-hint {
  font-size: 12px; color: var(--text-muted);
  animation: fadeInUp 0.5s 0.4s ease both;
}
.hero-hint kbd {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 1px 7px; border-radius: 4px;
  font-family: var(--font-mono); font-size: 11px;
}

/* ── STATS BAR ── */
.stats-bar {
  display: flex; gap: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: 80px;
  animation: fadeInUp 0.5s 0.5s ease both;
}

.stat-item {
  flex: 1; padding: 24px 18px; text-align: center;
  border-right: 1px solid var(--border);
  transition: background var(--transition);
}
.stat-item:last-child { border-right: none; }
.stat-item:hover { background: var(--bg-elevated); }

.stat-num {
  font-family: var(--font-heading);
  font-size: 32px; font-weight: 800;
  color: var(--accent); letter-spacing: -1.5px;
  line-height: 1;
}
.stat-label {
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-muted);
  margin-top: 5px;
}

/* ── SECTION HEADER ── */
.section-header {
  display: flex; align-items: flex-end; justify-content: space-between;
  margin-bottom: 32px;
}
.section-header h2 {
  font-family: var(--font-heading);
  font-size: 28px; font-weight: 700;
}
.section-header p { color: var(--text-secondary); font-size: 14px; margin-top: 5px; }

/* ══════════════════════════════════════════
   PATH CARDS GRID
══════════════════════════════════════════ */
.paths-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 18px;
}

.path-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 26px 26px 22px;
  color: var(--text);
  position: relative;
  overflow: hidden;
  display: flex; flex-direction: column; gap: 13px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  animation: fadeInUp 0.4s ease both;
}

/* Gradient left accent bar */
.path-card::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2));
  border-radius: 3px 0 0 3px;
  opacity: 0;
  transition: opacity var(--transition);
}

/* Subtle top highlight */
.path-card::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(79,172,222,0.3), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.path-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(79,172,222,0.18);
  border-color: rgba(79,172,222,0.28);
}
.path-card:hover::before { opacity: 1; }
.path-card:hover::after  { opacity: 1; }

.card-top {
  display: flex; align-items: center; justify-content: space-between;
}
.card-icon { font-size: 30px; line-height: 1; }

.card-badge {
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px;
  padding: 3px 11px; border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.path-card h3 {
  font-family: var(--font-heading);
  font-size: 19px; font-weight: 700;
}
.path-card p {
  font-size: 13px; color: var(--text-secondary);
  flex: 1; line-height: 1.65;
}

.card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 6px;
}
.card-count { font-size: 12px; color: var(--text-muted); }
.card-arrow {
  font-size: 16px; color: var(--accent);
  transition: transform var(--transition);
}
.path-card:hover .card-arrow { transform: translateX(5px); }

/* Staggered card animations */
.path-card:nth-child(1) { animation-delay: 0.05s; }
.path-card:nth-child(2) { animation-delay: 0.10s; }
.path-card:nth-child(3) { animation-delay: 0.15s; }
.path-card:nth-child(4) { animation-delay: 0.20s; }
.path-card:nth-child(5) { animation-delay: 0.25s; }
.path-card:nth-child(6) { animation-delay: 0.30s; }

/* ══════════════════════════════════════════
   PATH BROWSER PAGE
══════════════════════════════════════════ */
.path-browser {
  display: flex;
  height: calc(100vh - 56px);
  overflow: hidden;
}

/* ── LEFT NAV PANEL ── */
.path-nav-panel {
  width: 270px; min-width: 270px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  overflow-y: auto;
  display: flex; flex-direction: column;
}

.path-nav-title {
  display: flex; align-items: center; gap: 11px;
  padding: 22px 18px 16px;
  font-family: var(--font-heading);
  font-size: 14px; font-weight: 700;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
  background: var(--sidebar-bg); z-index: 2;
  color: var(--text);
}

/* Phase groups in left nav */
.phase-group { border-bottom: 1px solid var(--border); }

.phase-toggle {
  display: flex; align-items: center; justify-content: space-between;
  padding: 11px 18px;
  font-size: 12px; font-weight: 600;
  color: var(--text-secondary); cursor: pointer;
  transition: color var(--transition), background var(--transition);
  user-select: none;
  gap: 8px;
}
.phase-toggle:hover { color: var(--text); background: var(--bg-elevated); }
.phase-toggle.active { color: var(--accent); }

.ph-arrow {
  font-size: 15px;
  transition: transform var(--transition);
  flex-shrink: 0;
  color: var(--text-muted);
}
.phase-toggle.open .ph-arrow { transform: rotate(90deg); }

/* Phase number pill in nav */
.phase-num-pill {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 10px; font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}
.phase-toggle.active .phase-num-pill {
  background: var(--accent-glow);
  border-color: rgba(79,172,222,0.3);
  color: var(--accent);
}

.phase-notes {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.phase-notes.open { max-height: 2000px; }

.phase-note-link {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 18px 7px 26px;
  font-size: 12px; color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.phase-note-link:hover { color: var(--text); background: var(--bg-elevated); }
.note-dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--border); flex-shrink: 0;
}

/* ── PATH MAIN ── */
.path-main { flex: 1; overflow-y: auto; padding: 44px 52px; }

.path-hero {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 18px; padding: 36px 40px;
  margin-bottom: 48px;
  position: relative; overflow: hidden;
  animation: fadeInUp 0.4s ease both;
}

/* Subtle glow top accent */
.path-hero::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 18px 18px 0 0;
}

.path-hero-top {
  display: flex; align-items: center; gap: 22px; margin-bottom: 16px;
}
.path-hero-icon { font-size: 48px; line-height: 1; }

.path-hero h1 {
  font-family: var(--font-heading);
  font-size: 34px; font-weight: 800; letter-spacing: -1px;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.path-progress-bar {
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px; overflow: hidden;
  margin-top: 18px;
}
.path-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
  transition: width 1s ease;
}

/* ── PHASE SECTIONS ── */
.phase-section { margin-bottom: 60px; animation: fadeInUp 0.4s ease both; }

.phase-section-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.phase-num {
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 700; letter-spacing: 0.5px;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 4px 12px; border-radius: 999px;
  border: 1px solid rgba(79,172,222,0.22);
  white-space: nowrap;
}

.phase-section-header h2 {
  font-family: var(--font-heading);
  font-size: 20px; font-weight: 700;
  color: var(--text);
}

/* ── NOTES GRID ── */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.note-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  color: var(--text);
  display: flex; flex-direction: column; gap: 10px;
  position: relative; overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.note-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad-accent);
  opacity: 0;
  transition: opacity var(--transition);
}
.note-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
  transform: translateY(-2px);
}
.note-card:hover::before { opacity: 1; }

.note-card-num {
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 700;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid rgba(79,172,222,0.2);
  padding: 2px 8px; border-radius: 4px;
  align-self: flex-start;
}
.note-card-title {
  font-size: 14px; font-weight: 600; flex: 1;
  color: var(--text); line-height: 1.5;
}
.note-card-arrow {
  font-size: 12px; color: var(--text-muted);
  transition: color var(--transition), transform var(--transition);
  display: flex; align-items: center; gap: 4px;
}
.note-card:hover .note-card-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ══════════════════════════════════════════
   VIEWER PAGE
══════════════════════════════════════════ */
.viewer-layout {
  display: flex;
  height: calc(100vh - 56px);
  overflow: hidden;
  position: relative;
}

/* ── SIDEBAR PEEK BUTTON ── */
.sidebar-peek-btn {
  position: fixed; left: 0; top: 50%;
  transform: translateY(-50%);
  width: 22px; height: 64px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: none;
  border-radius: 0 8px 8px 0;
  cursor: pointer;
  color: var(--text-secondary); font-size: 13px;
  display: none; align-items: center; justify-content: center;
  z-index: 50;
  transition: color var(--transition), background var(--transition);
}
.sidebar-peek-btn.visible { display: flex; }
.sidebar-peek-btn:hover {
  color: var(--accent);
  background: var(--bg-card);
  border-color: var(--border-hover);
}

/* ── SIDEBAR OVERLAY (mobile) ── */
.sidebar-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 40;
}
.sidebar-overlay.visible { display: block; }

/* ── VIEWER SIDEBAR ── */
.viewer-sidebar {
  width: 260px; min-width: 260px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  overflow-y: auto; overflow-x: hidden;
  display: flex; flex-direction: column;
  transition: width 0.28s ease, min-width 0.28s ease, opacity 0.28s ease;
  z-index: 10;
}
.viewer-sidebar.hidden {
  width: 0; min-width: 0; opacity: 0; pointer-events: none;
}

.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 11px; font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.7px;
  position: sticky; top: 0;
  background: var(--sidebar-bg); z-index: 2;
  white-space: nowrap;
  gap: 8px;
}

.sidebar-close-btn {
  width: 24px; height: 24px;
  border-radius: var(--radius-sm);
  background: transparent; border: none;
  cursor: pointer; color: var(--text-muted);
  font-size: 13px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.sidebar-close-btn:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.sidebar-content { padding: 6px 0; overflow-x: hidden; }

/* Sidebar phase groups */
.sb-phase-group { border-bottom: 1px solid var(--border); }

.sb-phase-title {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 14px;
  font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.7px;
  color: var(--text-muted); cursor: pointer;
  transition: background var(--transition), color var(--transition);
  user-select: none; white-space: nowrap; gap: 6px;
}
.sb-phase-title:hover { background: var(--bg-elevated); color: var(--text-secondary); }
.sb-arrow { transition: transform var(--transition); flex-shrink: 0; }
.sb-phase-title.open .sb-arrow { transform: rotate(90deg); }
.sb-phase-notes { display: none; }
.sb-phase-notes.open { display: block; }

.sb-note-link {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 14px 7px 20px;
  font-size: 12px; color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.sb-note-link:hover { color: var(--text); background: var(--bg-elevated); }
.sb-note-link.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-right: 2px solid var(--accent);
  font-weight: 500;
}
.sb-dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--border); flex-shrink: 0;
  transition: background var(--transition);
}
.sb-note-link.active .sb-dot { background: var(--accent); }

/* ── VIEWER MAIN ── */
.viewer-main {
  flex: 1; overflow-y: auto;
  padding: 52px 64px;
  display: flex; flex-direction: column;
  align-items: center;
}

/* ── LOADING & ERROR STATES ── */
.loading-state, .error-state {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  width: 100%; height: 60vh; gap: 18px;
  color: var(--text-secondary);
}

.loading-spinner {
  width: 38px; height: 38px;
  border: 3px solid var(--bg-elevated);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

.error-title {
  font-family: var(--font-heading);
  font-size: 22px; font-weight: 700;
  color: var(--danger);
}

/* ── NOTE WRAP ── */
.note-wrap { width: 100%; max-width: 780px; }

/* ══════════════════════════════════════════
   MARKDOWN CONTENT
══════════════════════════════════════════ */
.markdown-content {
  max-width: 780px;
  font-size: 15px; line-height: 1.78;
  color: var(--text);
}

.markdown-content h1 {
  font-family: var(--font-heading);
  font-size: 36px; font-weight: 800; letter-spacing: -1.5px;
  line-height: 1.15; margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 70%, #76e4f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.markdown-content h2 {
  font-family: var(--font-heading);
  font-size: 23px; font-weight: 700;
  margin: 52px 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  color: var(--text);
}

.markdown-content h3 {
  font-family: var(--font-heading);
  font-size: 18px; font-weight: 600;
  margin: 36px 0 12px;
  color: var(--text);
}

.markdown-content h4 {
  font-size: 14px; font-weight: 600;
  margin: 24px 0 8px;
  color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.6px;
}

.markdown-content h5, .markdown-content h6 {
  font-size: 13px; font-weight: 600;
  margin: 20px 0 6px;
  color: var(--text-secondary);
}

.markdown-content p { margin-bottom: 18px; }
.markdown-content > p:first-of-type { font-size: 16px; color: var(--text-secondary); }

.markdown-content ul, .markdown-content ol {
  margin: 0 0 18px 24px; line-height: 1.8;
}
.markdown-content ul { list-style: none; margin-left: 0; }
.markdown-content ul li {
  padding-left: 20px;
  position: relative;
}
.markdown-content ul li::before {
  content: '';
  position: absolute; left: 4px; top: 11px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}
.markdown-content ol { list-style: decimal; }
.markdown-content li { margin-bottom: 6px; }
.markdown-content li > ul, .markdown-content li > ol { margin-top: 6px; margin-bottom: 4px; }

.markdown-content strong { font-weight: 700; color: var(--text); }
.markdown-content em { font-style: italic; color: var(--text-secondary); }
.markdown-content a { color: var(--accent); text-decoration: underline; text-decoration-color: var(--accent-glow); }
.markdown-content a:hover { color: var(--accent-hover); }

/* Horizontal rule — gradient line */
.markdown-content hr {
  border: none; height: 1px; margin: 40px 0;
  background: linear-gradient(90deg, transparent, var(--border-hover), transparent);
}

/* ── BLOCKQUOTE ── */
.markdown-content blockquote {
  border-left: 3px solid var(--accent);
  background: rgba(79,172,222,0.05);
  padding: 16px 22px; margin: 24px 0;
  border-radius: 0 10px 10px 0;
  color: var(--text-secondary);
  font-style: italic;
}
[data-theme="light"] .markdown-content blockquote {
  background: rgba(43,108,176,0.05);
}
.markdown-content blockquote > p:last-child { margin-bottom: 0; }
.markdown-content blockquote strong { color: var(--accent); }

/* ── TABLE ── */
.markdown-content table {
  width: 100%; border-collapse: collapse;
  margin: 28px 0; font-size: 13.5px;
  border-radius: 10px; overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.markdown-content th {
  background: var(--bg-elevated);
  padding: 11px 16px; text-align: left;
  font-weight: 600; color: var(--text);
  border-bottom: 1px solid var(--border);
  font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.4px;
}
.markdown-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}
.markdown-content tr:last-child td { border-bottom: none; }
.markdown-content tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
[data-theme="light"] .markdown-content tr:nth-child(even) td { background: rgba(0,0,0,0.02); }
.markdown-content tr:hover td { background: var(--bg-elevated); color: var(--text); }

/* ── INLINE CODE ── */
.markdown-content code:not([class*="language-"]) {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background: var(--code-bg);
  color: var(--accent);
  padding: 2px 7px; border-radius: 4px;
  border: 1px solid var(--code-border);
}

/* ── CODE BLOCKS ── */
.code-block-wrap { position: relative; margin: 24px 0; }

.code-block-wrap pre {
  background: var(--code-bg) !important;
  border: 1px solid var(--code-border);
  border-radius: 10px !important;
  overflow-x: auto;
  padding: 20px 20px 20px 20px;
  margin: 0;
  font-family: var(--font-mono) !important;
  font-size: 13px; line-height: 1.75;
}

/* When there's a lang label, add top padding */
.code-block-wrap.has-lang pre { padding-top: 40px; }

.code-lang-label {
  position: absolute; top: 0; left: 0; right: 0;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 10px; font-weight: 600;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.8px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--code-border);
  border-radius: 10px 10px 0 0;
  display: flex; align-items: center; gap: 8px;
}
[data-theme="light"] .code-lang-label { background: rgba(0,0,0,0.03); }

.code-lang-label::before {
  content: '';
  display: inline-block;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}

.copy-btn {
  position: absolute; top: 8px; right: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 11px;
  font-size: 11px; font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  opacity: 0;
}
.code-block-wrap:hover .copy-btn { opacity: 1; }
.copy-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.copy-btn.copied { background: var(--accent2); color: #fff; border-color: var(--accent2); }

/* ── MERMAID ── */
.mermaid {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px; margin: 24px 0;
  text-align: center; overflow-x: auto;
}

/* ── NOTE METADATA ── */
.note-meta {
  display: flex; gap: 14px; flex-wrap: wrap;
  margin-bottom: 36px; padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
  animation: fadeInUp 0.3s ease both;
}
.meta-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 999px;
}

/* ── NOTE NAVIGATION ── */
.note-nav {
  display: flex; gap: 14px;
  margin-top: 64px; padding-top: 28px;
  border-top: 1px solid var(--border);
  width: 100%;
}
.note-nav a {
  flex: 1; padding: 18px 22px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text);
  transition: all var(--transition);
  display: flex; flex-direction: column; gap: 5px;
}
.note-nav a:hover {
  border-color: var(--border-hover);
  background: var(--bg-elevated);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.prev-label, .next-label {
  font-size: 11px; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.5px;
}
.note-title {
  font-size: 14px; font-weight: 600;
  color: var(--text);
}
.next-link { text-align: right; }

/* ══════════════════════════════════════════
   SEARCH PAGE
══════════════════════════════════════════ */
.search-wrap { max-width: 800px; margin: 0 auto; padding: 64px 28px; }

.search-title {
  font-family: var(--font-heading);
  font-size: 30px; font-weight: 800;
  margin-bottom: 8px;
}

.search-subtitle {
  color: var(--text-secondary); font-size: 15px;
  margin-bottom: 32px;
}

.search-box-wrap { position: relative; margin-bottom: 36px; }
.search-input {
  width: 100%; padding: 15px 22px 15px 50px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: 16px; color: var(--text);
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-input:focus {
  border-color: var(--border-hover);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.search-input::placeholder { color: var(--text-muted); }

.search-icon {
  position: absolute; left: 17px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted); font-size: 18px;
  pointer-events: none;
}

.search-results { display: flex; flex-direction: column; gap: 12px; }
.search-result {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px 22px;
  cursor: pointer; transition: all var(--transition);
}
.search-result:hover {
  border-color: var(--border-hover);
  background: var(--bg-elevated);
  transform: translateX(3px);
}
.result-title { font-size: 15px; font-weight: 600; margin-bottom: 5px; }
.result-path { font-size: 12px; color: var(--text-muted); }
.result-snippet { font-size: 13px; color: var(--text-secondary); margin-top: 7px; line-height: 1.6; }
.search-empty { text-align: center; color: var(--text-muted); padding: 60px 0; }
.search-count { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; }

/* ══════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .path-main { padding: 36px 36px; }
}

@media (max-width: 768px) {
  .header { padding: 0 16px; gap: 10px; }
  .header-divider { display: none; }

  .home-wrap { padding: 0 16px 64px; }
  .hero { padding: 72px 8px 52px; }
  .hero h1 { letter-spacing: -1.5px; }
  .paths-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-wrap: wrap; border-radius: var(--radius-lg); }
  .stat-item { min-width: 50%; }

  .path-nav-panel { display: none; }
  .path-main { padding: 24px 20px; }
  .path-hero { padding: 24px 22px; }
  .path-hero h1 { font-size: 24px; }
  .notes-grid { grid-template-columns: 1fr; }

  .sidebar-mode-bar { display: none; }
  .viewer-main { padding: 28px 18px; }

  .markdown-content h1 { font-size: 26px; }
  .markdown-content h2 { font-size: 20px; }
  .markdown-content h3 { font-size: 17px; }

  .note-nav { flex-direction: column; }
  .next-link { text-align: left; }

  .search-wrap { padding: 40px 16px; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: center; }
  .stat-item { min-width: 100%; }
  .header-btn { display: none; }
}

/* ══════════════════════════════════════════
   LOGO SYMBOL
══════════════════════════════════════════ */
.logo-symbol {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

/* ══════════════════════════════════════════
   THEME SETTINGS PANEL
══════════════════════════════════════════ */
.settings-btn {
  width: 36px; height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}
.settings-btn:hover {
  background: var(--bg-card);
  border-color: var(--border-hover);
  color: var(--accent);
  transform: rotate(30deg);
}

.theme-panel {
  position: fixed;
  top: 66px;
  right: 20px;
  width: 300px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px var(--border);
  padding: 20px;
  z-index: 99999;
  display: none;
}
.theme-panel.open {
  display: block;
  animation: fadeInDown 0.18s ease;
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.theme-panel-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.theme-swatches {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.theme-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 8px 4px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  transition: all var(--transition);
  background: transparent;
}
.theme-swatch:hover { background: var(--bg-elevated); }
.theme-swatch.active { border-color: var(--accent); background: var(--accent-glow); }

.swatch-circle {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  flex-shrink: 0;
}

.swatch-label {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.2;
}

.theme-divider {
  height: 1px;
  background: var(--border);
  margin: 16px 0;
}

.theme-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Settings wrapper for header positioning */
.settings-wrapper {
  position: relative;
}

/* ══════════════════════════════════════════
   DIAGRAM ZOOM / PAN
══════════════════════════════════════════ */
.diagram-zoom-wrap {
  position: relative;
  margin: 28px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--code-bg);
  overflow: hidden;
}

.diagram-controls {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.diagram-zoom-wrap:hover .diagram-controls { opacity: 1; }

.dz-btn {
  width: 26px; height: 26px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s ease;
  padding: 0;
  line-height: 1;
}
.dz-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.dz-hint {
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 0 4px;
  white-space: nowrap;
}

.diagram-zoom-inner {
  overflow: hidden;
  min-height: 80px;
  padding: 24px 16px 16px;
  cursor: grab;
  user-select: none;
}
.diagram-zoom-inner:active { cursor: grabbing; }

.diagram-zoom-inner .mermaid {
  display: flex;
  justify-content: center;
  transition: transform 0.1s ease;
  will-change: transform;
}

.diagram-zoom-inner .mermaid svg {
  max-width: 100%;
  height: auto;
}