:root {
  color-scheme: dark;
  --bg: #0a0d12;
  --surface: #111620;
  --card: #171d2a;
  --border: #252e3f;
  --text: #e2e8f3;
  --muted: #7d8a9e;
  --accent: #64a8ff;
  --accent-dim: rgba(100,168,255,0.12);
  --ok: #4ce39a;
  --warn: #ffad33;
  --danger: #ff4a66;
  --radius: 10px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.55 var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: #9ac5ff; }

/* TOPBAR */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,13,18,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.topbar-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
  height: 56px;
}

.logo {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .3px;
  color: var(--text);
  white-space: nowrap;
}

.logo span { color: var(--accent); }

nav { display: flex; gap: 4px; overflow-x: auto; }
nav a {
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 13px;
  color: var(--muted);
  border: 1px solid transparent;
  transition: all .15s;
  white-space: nowrap;
}
nav a:hover, nav a.active {
  color: var(--text);
  border-color: var(--border);
  background: var(--card);
}
nav a.active { border-color: var(--accent); color: var(--accent); }

/* LAYOUT */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 24px;
  flex: 1;
}

/* HERO */
.hero {
  background: linear-gradient(135deg, var(--card), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 32px;
}

.hero h1 { font-size: 28px; margin-bottom: 6px; }
.hero .sub { color: var(--muted); font-size: 15px; margin-bottom: 16px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border);
  color: #bcc8dc;
  border-radius: 99px;
  padding: 4px 12px;
  font-size: 12px;
  background: rgba(255,255,255,0.03);
}

/* CARD GRID */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s, transform .2s;
}

.card:hover {
  border-color: rgba(100,168,255,0.35);
  transform: translateY(-2px);
}

.card-thumb {
  height: 180px;
  background: var(--surface);
  display: grid;
  place-items: center;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.card-thumb .icon {
  font-size: 48px;
  opacity: .35;
}

.card-body { padding: 16px; }
.card-body h3 { font-size: 16px; margin-bottom: 6px; }
.card-body p { color: var(--muted); font-size: 13px; line-height: 1.5; }

.card-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

.badge {
  display: inline-block;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 600;
}
.badge-html { background: rgba(100,168,255,0.12); color: var(--accent); border: 1px solid rgba(100,168,255,0.25); }
.badge-md { background: rgba(76,227,154,0.12); color: var(--ok); border: 1px solid rgba(76,227,154,0.25); }
.badge-plan { background: rgba(255,173,51,0.12); color: var(--warn); border: 1px solid rgba(255,173,51,0.25); }

/* SECTION */
.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.section h2 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

/* DOC EMBED */
.doc-frame {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.doc-frame iframe {
  width: 100%;
  border: none;
  min-height: 80vh;
}

.doc-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.02);
}

.doc-header h2 { font-size: 16px; margin: 0; border: none; padding: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--muted);
  cursor: pointer;
  transition: all .15s;
}
.btn:hover { border-color: var(--accent); color: var(--text); }

/* TABLE */
.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.ref-table th {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 2px solid var(--border);
  color: var(--muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .5px;
}

.ref-table td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(37,46,63,0.5);
  vertical-align: top;
}

.ref-table tr:hover td { background: rgba(100,168,255,0.03); }

/* FOOTER */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .topbar { padding: 0 16px; }
  .topbar-inner {
    flex-wrap: wrap;
    height: auto;
    min-height: 56px;
    padding: 8px 0;
    gap: 8px;
  }
  .logo { font-size: 14px; }
  nav {
    flex: 1 1 100%;
    order: 2;
    justify-content: flex-start;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }
  nav a { padding: 6px 10px; font-size: 12px; }
  .container { padding: 20px 16px; }
  .hero { padding: 24px 20px; }
  .hero h1 { font-size: 22px; }
  .hero .sub { font-size: 14px; }
  .chips { gap: 6px; }
  .chip { padding: 3px 10px; font-size: 11px; }
  .card-grid { grid-template-columns: 1fr; gap: 12px; }
  .card-thumb { height: 140px; }
  .card-body h3 { font-size: 15px; }
  .card-body p { font-size: 12px; }
  .card-footer { flex-wrap: wrap; gap: 6px; font-size: 11px; }
  .doc-frame { margin: 0 -16px 24px; border-radius: 0; border-left: none; border-right: none; }
  .doc-header { padding: 12px 16px; }
  .doc-frame iframe { min-height: 70vh; }
  .site-footer { padding: 16px; font-size: 11px; }
}

@media (max-width: 480px) {
  .topbar-inner { gap: 6px; }
  .container { padding: 16px 12px; }
  .hero { padding: 16px; margin-bottom: 24px; }
  .hero h1 { font-size: 18px; }
  .card-thumb { height: 120px; }
  .card-thumb .icon { font-size: 36px; }
}

/* MARKDOWN CONTENT (for md pages rendered inline) */
.md-content { line-height: 1.7; }
.md-content h1 { font-size: 24px; margin: 24px 0 12px; }
.md-content h2 { font-size: 20px; margin: 20px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.md-content h3 { font-size: 16px; margin: 16px 0 8px; }
.md-content p { margin: 8px 0; color: var(--text); }
.md-content ul, .md-content ol { padding-left: 24px; margin: 8px 0; }
.md-content li { margin: 4px 0; }
.md-content code {
  font: 12px var(--mono);
  background: rgba(0,0,0,.3);
  padding: 2px 6px;
  border-radius: 4px;
  color: #c9d7ef;
}
.md-content pre {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  overflow-x: auto;
  margin: 12px 0;
  font: 12px/1.6 var(--mono);
  color: #c9d7ef;
}
.md-content table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13px; }
.md-content th { text-align: left; padding: 8px; border-bottom: 2px solid var(--border); color: var(--muted); font-size: 11px; text-transform: uppercase; }
.md-content td { padding: 8px; border-bottom: 1px solid rgba(37,46,63,0.5); }
.md-content blockquote { border-left: 3px solid var(--accent); padding: 8px 16px; margin: 12px 0; color: var(--muted); background: rgba(100,168,255,0.04); border-radius: 0 8px 8px 0; }
.md-content strong { color: #dbe6ff; }
.md-content hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }