@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

:root {
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99,102,241,0.12);
  --bg: #0a0a0b;
  --surface: #111113;
  --surface-2: #18181b;
  --text: #f4f4f5;
  --text-2: #a1a1aa;
  --text-3: #71717a;
  --border: rgba(255,255,255,0.07);
  --border-2: rgba(255,255,255,0.12);
  --green: #10b981;
  --red: #ef4444;
  --yellow: #f59e0b;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── TOP NAV ── */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,11,0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topnav .brand { font-size: 17px; font-weight: 700; color: var(--text); text-decoration: none; }
.topnav .brand span { color: var(--accent); }
.topnav nav { display: flex; gap: 28px; align-items: center; }
.topnav nav a {
  color: var(--text-3); font-size: 13px; font-weight: 500;
  text-decoration: none; transition: color 150ms;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.topnav nav a:hover { color: var(--text); }
.topnav nav a.active { color: var(--accent); border-bottom-color: var(--accent); }
.topnav .badge {
  font-size: 11px; padding: 3px 10px; border-radius: 999px;
  background: var(--accent-glow); color: var(--accent-light);
  border: 1px solid rgba(99,102,241,0.25); font-weight: 500;
}

/* ── SIDEBAR LAYOUT ── */
.layout { display: flex; min-height: calc(100vh - 56px); }
.sidebar {
  width: 240px; flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  position: sticky; top: 56px;
  height: calc(100vh - 56px);
  overflow-y: auto;
}
.sidebar-section { padding: 0 16px; margin-bottom: 24px; }
.sidebar-label {
  font-size: 10px; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-3);
  margin-bottom: 6px; padding: 0 8px;
}
.sidebar a {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 8px; border-radius: 6px;
  color: var(--text-2); font-size: 13px; font-weight: 500;
  text-decoration: none; transition: all 150ms;
}
.sidebar a:hover { background: var(--surface-2); color: var(--text); }
.sidebar a.active { background: var(--accent-glow); color: var(--accent-light); }
.sidebar a .icon { font-size: 14px; width: 18px; text-align: center; }
.sidebar .phase-badge {
  font-size: 10px; padding: 1px 6px; border-radius: 999px;
  background: var(--surface-2); color: var(--text-3);
  margin-left: auto; font-weight: 500;
}

/* ── MAIN CONTENT ── */
.main { flex: 1; padding: 48px 56px; max-width: 900px; }

/* ── HERO ── */
.page-hero { margin-bottom: 40px; }
.page-hero .eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--accent-light);
  background: var(--accent-glow); border: 1px solid rgba(99,102,241,0.2);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 16px;
}
.page-hero h1 {
  font-size: 36px; font-weight: 700; letter-spacing: -0.7px;
  line-height: 1.1; color: var(--text); margin-bottom: 12px;
}
.page-hero p { font-size: 17px; color: var(--text-2); max-width: 580px; line-height: 1.65; }

/* ── TYPOGRAPHY ── */
.content h2 {
  font-size: 22px; font-weight: 600; letter-spacing: -0.3px;
  color: var(--text); margin: 36px 0 12px 0;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.content h3 { font-size: 16px; font-weight: 600; color: var(--text-2); margin: 24px 0 8px 0; }
.content p { color: var(--text-2); margin-bottom: 14px; line-height: 1.7; }
.content ul, .content ol { color: var(--text-2); padding-left: 20px; margin-bottom: 14px; }
.content li { margin-bottom: 4px; line-height: 1.65; }
.content strong { color: var(--text); font-weight: 600; }
.content a { color: var(--accent-light); text-decoration: none; }
.content a:hover { text-decoration: underline; }

/* ── CODE ── */
.content pre {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px 20px; margin: 12px 0 20px 0;
  overflow-x: auto; font-size: 12.5px; line-height: 1.6;
}
.content code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 13px;
}
.content p code, .content li code {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 4px; padding: 1px 5px; font-size: 12px; color: var(--accent-light);
}

/* ── TABLES ── */
.content table { width: 100%; border-collapse: collapse; margin: 12px 0 20px 0; font-size: 13.5px; }
.content th {
  background: var(--surface-2); color: var(--text); font-weight: 600;
  padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border-2);
  font-size: 12px; letter-spacing: 0.02em;
}
.content td { padding: 8px 12px; border-bottom: 1px solid var(--border); color: var(--text-2); vertical-align: top; }
.content tr:last-child td { border-bottom: none; }
.content tr:hover td { background: rgba(255,255,255,0.02); }

/* ── CARDS ── */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 20px 0; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 20px;
  transition: border-color 200ms, transform 200ms, box-shadow 200ms;
}
.card:hover { border-color: var(--border-2); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.3); }
.card .card-icon { font-size: 22px; margin-bottom: 10px; }
.card .card-title { font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.card .card-desc { font-size: 13px; color: var(--text-3); line-height: 1.55; }

/* ── STAT CARDS ── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 20px 0; }
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 20px;
}
.stat-card .stat-value { font-size: 28px; font-weight: 700; color: var(--accent-light); letter-spacing: -0.5px; }
.stat-card .stat-label { font-size: 12px; color: var(--text-3); margin-top: 2px; }

/* ── PHASE TIMELINE ── */
.phase-list { display: flex; flex-direction: column; gap: 0; margin: 20px 0; }
.phase-item { display: flex; gap: 16px; position: relative; }
.phase-item:not(:last-child)::before {
  content: ''; position: absolute;
  left: 15px; top: 36px; bottom: -8px; width: 2px;
  background: var(--border);
}
.phase-dot {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: var(--surface-2); border: 2px solid var(--border-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: var(--text-2);
  margin-top: 4px; z-index: 1;
}
.phase-dot.active { background: var(--accent-glow); border-color: var(--accent); color: var(--accent-light); }
.phase-content { padding-bottom: 28px; flex: 1; }
.phase-content h4 { font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.phase-content p { font-size: 13px; color: var(--text-3); }
.phase-content .weeks { font-size: 11px; color: var(--accent-light); font-weight: 500; margin-bottom: 4px; }

/* ── CALLOUTS ── */
.callout {
  border-left: 3px solid var(--accent); background: var(--accent-glow);
  border-radius: 0 8px 8px 0; padding: 12px 16px; margin: 16px 0;
  font-size: 14px; color: var(--text-2);
}
.callout.green { border-color: var(--green); background: rgba(16,185,129,0.08); }
.callout.yellow { border-color: var(--yellow); background: rgba(245,158,11,0.08); }
.callout.red { border-color: var(--red); background: rgba(239,68,68,0.08); }
.callout strong { color: var(--text); }

/* ── FOOTER ── */
.page-footer {
  border-top: 1px solid var(--border); padding: 32px 40px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px; margin-top: 80px;
}
.page-footer .brand { font-size: 14px; font-weight: 700; color: var(--text); }
.page-footer .brand span { color: var(--accent); }
.page-footer .tagline { font-size: 12px; color: var(--text-3); font-style: italic; }
.page-footer .conf { font-size: 11px; color: var(--text-3); }

/* ── ANIMATION SECTION ── */
.video-wrap {
  border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
  margin: 24px 0; background: var(--surface-2);
}
.video-wrap video { width: 100%; display: block; }
.video-caption { font-size: 12px; color: var(--text-3); padding: 8px 16px; text-align: center; border-top: 1px solid var(--border); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .sidebar { display: none; }
  .main { padding: 32px 24px; }
  .topnav { padding: 0 20px; }
  .page-hero h1 { font-size: 26px; }
}