/* ============================================================
   VTS Design System — doc-site chrome
   Uses DS tokens from styles.css; flips with [data-theme].
   ============================================================ */

:root {
  --side-w: 288px;
  --top-h: 60px;
  --chrome-bg: var(--p-surface-0);
  --chrome-alt: var(--p-surface-50);
  --chrome-line: var(--p-surface-200);
  --chrome-line-soft: var(--p-surface-100);
  --chrome-ink: var(--p-surface-900);
  --chrome-body: var(--p-surface-600);
  --chrome-muted: var(--p-surface-500);
  --brand: #ee0033;
  --brand-soft: color-mix(in srgb, var(--brand), transparent 90%);
  --radius: 12px;
  --mono: var(--p-font-family-mono, ui-monospace, "SF Mono", Menlo, monospace);
}
[data-theme="dark"] {
  --chrome-bg: var(--p-surface-950);
  --chrome-alt: var(--p-surface-900);
  --chrome-line: var(--p-surface-800);
  --chrome-line-soft: var(--p-surface-900);
  --chrome-ink: var(--p-surface-0);
  --chrome-body: var(--p-surface-300);
  --chrome-muted: var(--p-surface-400);
  --brand: #ff3355;
  --brand-soft: color-mix(in srgb, var(--brand), transparent 86%);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--p-font-family, "Roboto", system-ui, sans-serif);
  background: var(--chrome-bg);
  color: var(--chrome-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
.hidden { display: none !important; }
::selection { background: var(--brand-soft); }

#app { display: grid; grid-template-columns: var(--side-w) 1fr; min-height: 100vh; }

/* ---------- Sidebar ---------- */
#sidebar {
  position: sticky; top: 0; align-self: start;
  height: 100vh; display: flex; flex-direction: column;
  background: var(--chrome-alt);
  border-right: 1px solid var(--chrome-line);
  z-index: 40;
}
.side-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 20px 10px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 30px; height: 30px; object-fit: contain; }
.brand-name { display: flex; flex-direction: column; font-weight: 700; font-size: 16px; letter-spacing: -.02em; color: var(--chrome-ink); line-height: 1.05; }
.brand-sub { font-weight: 500; font-size: 11px; letter-spacing: .02em; color: var(--chrome-muted); }

.search-trigger {
  margin: 6px 16px 14px; display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border: 1px solid var(--chrome-line); background: var(--chrome-bg);
  border-radius: 10px; color: var(--chrome-muted); font: inherit; font-size: 13.5px; cursor: pointer;
  transition: border-color .15s, box-shadow .15s;
}
.search-trigger:hover { border-color: var(--p-surface-400); }
.search-trigger .pi { font-size: 14px; }
.search-trigger span { flex: 1; text-align: left; }
kbd {
  font: 600 11px/1 var(--p-font-family, sans-serif); color: var(--chrome-muted);
  background: var(--chrome-alt); border: 1px solid var(--chrome-line);
  border-radius: 5px; padding: 3px 6px;
}

#nav { flex: 1; overflow-y: auto; padding: 4px 10px 20px; }
#nav::-webkit-scrollbar { width: 9px; }
#nav::-webkit-scrollbar-thumb { background: var(--chrome-line); border-radius: 9px; border: 2px solid var(--chrome-alt); }

.nav-group { margin-top: 14px; }
.nav-title {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
  padding: 6px 10px; margin: 0; border: 0; background: none; cursor: pointer;
  font: 700 11px/1 var(--p-font-family, sans-serif); letter-spacing: .1em; text-transform: uppercase;
  color: var(--chrome-muted);
}
.nav-title .pi { font-size: 11px; transition: transform .18s; }
.nav-group.collapsed .nav-title .pi { transform: rotate(-90deg); }
.nav-group.collapsed .nav-items { display: none; }
.nav-items { list-style: none; margin: 4px 0 0; padding: 0; }
.nav-link {
  display: flex; align-items: center; gap: 9px; padding: 7px 10px; border-radius: 8px;
  color: var(--chrome-body); font-size: 13.5px; cursor: pointer; line-height: 1.2;
}
.nav-link .ni { font-size: 14px; width: 16px; text-align: center; color: var(--chrome-muted); }
.nav-link:hover { background: var(--chrome-line-soft); color: var(--chrome-ink); }
.nav-link.active { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.nav-link.active .ni { color: var(--brand); }

.side-foot { padding: 12px 20px; border-top: 1px solid var(--chrome-line); font-size: 12px; color: var(--chrome-muted); display: flex; gap: 8px; align-items: center; }
.side-foot .dot { opacity: .5; }

/* ---------- Content ---------- */
#content { min-width: 0; display: flex; flex-direction: column; }
#topbar {
  position: sticky; top: 0; z-index: 30; height: var(--top-h);
  display: flex; align-items: center; gap: 14px; padding: 0 26px;
  background: color-mix(in srgb, var(--chrome-bg), transparent 12%);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--chrome-line);
}
.crumb { flex: 1; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--chrome-muted); min-width: 0; }
.crumb .sep { opacity: .5; }
.crumb .cur { color: var(--chrome-ink); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; width: 38px; height: 38px;
  border: 1px solid var(--chrome-line); background: var(--chrome-bg); border-radius: 9px;
  color: var(--chrome-body); cursor: pointer; font-size: 15px; transition: border-color .15s, color .15s;
}
.icon-btn:hover { color: var(--chrome-ink); border-color: var(--p-surface-400); }
.pill-btn {
  display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 13px;
  border: 1px solid var(--chrome-line); background: var(--chrome-bg); border-radius: 9px;
  color: var(--chrome-body); cursor: pointer; font: inherit; font-size: 13px; font-weight: 500;
  transition: border-color .15s, color .15s;
}
.pill-btn:hover { color: var(--chrome-ink); border-color: var(--p-surface-400); }
.pill-btn.accent { background: var(--brand); border-color: var(--brand); color: #fff; }
.pill-btn.accent:hover { background: color-mix(in srgb, var(--brand), #000 8%); color: #fff; }

#main { flex: 1; outline: none; }

/* ---------- Doc page ---------- */
.page { max-width: 1120px; margin: 0 auto; padding: 44px 44px 100px; }
.page-kick { font: 700 12px/1 var(--p-font-family, sans-serif); letter-spacing: .14em; text-transform: uppercase; color: var(--brand); margin: 0 0 14px; }
.page h1 { font-size: 44px; font-weight: 700; letter-spacing: -.03em; line-height: 1.05; color: var(--chrome-ink); margin: 0; }
.page .sub { font-size: 18px; line-height: 1.5; color: var(--chrome-muted); margin: 14px 0 0; max-width: 720px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600;
  padding: 5px 11px; border-radius: 999px; background: var(--chrome-alt);
  border: 1px solid var(--chrome-line); color: var(--chrome-body);
}
.chip.brand { color: var(--brand); background: var(--brand-soft); border-color: transparent; }

/* Preview frame */
.preview {
  margin-top: 28px; border: 1px solid var(--chrome-line); border-radius: 16px; overflow: hidden;
  background: var(--p-surface-0); box-shadow: var(--p-shadow-sm, 0 1px 2px rgba(0,0,0,.05));
}
[data-theme="dark"] .preview { background: var(--p-surface-900); }
.preview-bar {
  display: flex; align-items: center; gap: 10px; padding: 9px 14px;
  border-bottom: 1px solid var(--chrome-line); background: var(--chrome-alt);
  font-size: 12px; color: var(--chrome-muted);
}
.preview-bar .lbl { flex: 1; font-weight: 600; letter-spacing: .02em; }
.preview-bar .mini { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 7px; border: 1px solid var(--chrome-line); background: var(--chrome-bg); color: var(--chrome-body); cursor: pointer; }
.preview-bar .mini:hover { color: var(--chrome-ink); }
.preview-body { position: relative; background: var(--p-surface-0); }
[data-theme="dark"] .preview-body { background: var(--p-surface-950); }
.preview-body iframe { display: block; width: 100%; border: 0; background: transparent; }
.frame-loading { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; gap: 10px; color: var(--chrome-muted); font-size: 13px; }
.spin { width: 16px; height: 16px; border: 2px solid var(--chrome-line); border-top-color: var(--brand); border-radius: 50%; animation: sp .7s linear infinite; }
@keyframes sp { to { transform: rotate(360deg); } }

/* Usage block */
.usage { margin-top: 30px; }
.usage h2 { font-size: 15px; font-weight: 700; color: var(--chrome-ink); margin: 0 0 12px; letter-spacing: -.01em; }
.code {
  position: relative; background: var(--p-surface-950); color: #e6edf3; border-radius: 12px;
  padding: 16px 18px; font: 13px/1.7 var(--mono); overflow-x: auto; border: 1px solid var(--chrome-line);
}
[data-theme="dark"] .code { background: #06090f; }
.code .tok-key { color: #ff7b93; }
.code .tok-mod { color: #9ecbff; }
.code .tok-str { color: #a5d6a3; }
.code .tok-com { color: #7d8590; }
.copy-btn {
  position: absolute; top: 10px; right: 10px; display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px; font: 600 11px/1 var(--p-font-family, sans-serif); color: #cbd5e1;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15); border-radius: 7px; cursor: pointer;
}
.copy-btn:hover { background: rgba(255,255,255,.16); color: #fff; }

/* ---------- Overview ---------- */
.hero { padding: 12px 0 8px; }
.hero .logo { height: 40px; width: auto; margin-bottom: 26px; }
.hero h1 { font-size: 60px; letter-spacing: -.035em; line-height: .98; }
.hero .sub { font-size: 21px; max-width: 760px; margin-top: 20px; }
.hero .cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px; height: 46px; padding: 0 22px; border-radius: 11px;
  font: 600 15px/1 var(--p-font-family, sans-serif); cursor: pointer; border: 1px solid transparent;
}
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { background: color-mix(in srgb, var(--brand), #000 8%); }
.btn.ghost { background: var(--chrome-bg); color: var(--chrome-ink); border-color: var(--chrome-line); }
.btn.ghost:hover { border-color: var(--p-surface-400); }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 54px; }
.stat { background: var(--chrome-alt); border: 1px solid var(--chrome-line); border-radius: 14px; padding: 24px; }
.stat .n { font-size: 42px; font-weight: 700; letter-spacing: -.03em; color: var(--chrome-ink); font-variant-numeric: tabular-nums; }
.stat .t { font-size: 13.5px; color: var(--chrome-body); margin-top: 6px; line-height: 1.4; }

.sec-title { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--chrome-muted); margin: 64px 0 18px; }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.info-card { background: var(--chrome-bg); border: 1px solid var(--chrome-line); border-radius: 14px; padding: 22px; transition: border-color .15s, transform .15s; }
.info-card.link { cursor: pointer; }
.info-card.link:hover { border-color: var(--brand); transform: translateY(-2px); }
.info-card .ic { width: 38px; height: 38px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: var(--brand-soft); color: var(--brand); font-size: 17px; margin-bottom: 14px; }
.info-card h3 { font-size: 16px; color: var(--chrome-ink); margin: 0 0 6px; letter-spacing: -.01em; }
.info-card p { font-size: 13.5px; color: var(--chrome-body); margin: 0; line-height: 1.5; }
.info-card code { font-family: var(--mono); font-size: 12.5px; color: var(--brand); }

.principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 40px; }
.principle { display: flex; gap: 14px; padding: 4px 0; }
.principle .pi { color: var(--brand); font-size: 18px; margin-top: 2px; }
.principle b { color: var(--chrome-ink); font-weight: 600; display: block; margin-bottom: 3px; font-size: 15px; }
.principle span { font-size: 13.5px; color: var(--chrome-body); line-height: 1.5; }

/* Section landing grid (foundations / component groups) */
.tile-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin-top: 26px; }
.tile { background: var(--chrome-bg); border: 1px solid var(--chrome-line); border-radius: 12px; padding: 18px; cursor: pointer; transition: border-color .15s, transform .15s; }
.tile:hover { border-color: var(--brand); transform: translateY(-2px); }
.tile h4 { font-size: 15px; color: var(--chrome-ink); margin: 0 0 5px; }
.tile p { font-size: 12.5px; color: var(--chrome-muted); margin: 0; line-height: 1.45; }
.group-head { margin-top: 40px; }
.group-head:first-child { margin-top: 26px; }

/* ---------- Command palette ---------- */
.palette { position: fixed; inset: 0; z-index: 100; background: rgba(2,6,23,.45); backdrop-filter: blur(3px); display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh; }
.palette-box { width: min(620px, 92vw); background: var(--chrome-bg); border: 1px solid var(--chrome-line); border-radius: 16px; box-shadow: 0 24px 60px rgba(0,0,0,.35); overflow: hidden; }
.palette-input { display: flex; align-items: center; gap: 12px; padding: 16px 18px; border-bottom: 1px solid var(--chrome-line); }
.palette-input .pi { color: var(--chrome-muted); font-size: 16px; }
.palette-input input { flex: 1; border: 0; background: none; outline: none; font: inherit; font-size: 16px; color: var(--chrome-ink); }
.palette-list { list-style: none; margin: 0; padding: 8px; max-height: 52vh; overflow-y: auto; }
.pal-item { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 9px; cursor: pointer; }
.pal-item .pi { width: 18px; text-align: center; color: var(--chrome-muted); font-size: 14px; }
.pal-item .pal-name { color: var(--chrome-ink); font-size: 14px; font-weight: 500; }
.pal-item .pal-cat { margin-left: auto; font-size: 11px; color: var(--chrome-muted); background: var(--chrome-alt); padding: 3px 8px; border-radius: 6px; }
.pal-item.sel, .pal-item:hover { background: var(--brand-soft); }
.pal-item.sel .pal-name { color: var(--brand); }
.pal-empty { padding: 26px; text-align: center; color: var(--chrome-muted); font-size: 14px; }

/* ---------- Responsive ---------- */
#scrim { display: none; }
.only-mobile { display: none; }
@media (max-width: 900px) {
  #app { grid-template-columns: 1fr; }
  #sidebar { position: fixed; left: 0; top: 0; width: 300px; transform: translateX(-100%); transition: transform .22s ease; box-shadow: 0 12px 40px rgba(0,0,0,.25); }
  body.nav-open #sidebar { transform: translateX(0); }
  body.nav-open #scrim { display: block; position: fixed; inset: 0; background: rgba(2,6,23,.4); z-index: 35; }
  .only-mobile { display: inline-flex; }
  .page, .hero { padding-left: 22px; padding-right: 22px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid { grid-template-columns: 1fr; }
  .principles { grid-template-columns: 1fr; }
  .hero h1 { font-size: 44px; }
  .btxt { display: none; }
}
@media (max-width: 560px) {
  .stat-grid { grid-template-columns: 1fr; }
  .page h1 { font-size: 34px; }
}
@media (prefers-reduced-motion: reduce) { * { animation-duration: .001ms !important; transition: none !important; } }