:root {
  --bg: #0b0d10;
  --bg-elev: #13161b;
  --bg-card: #171b21;
  --border: #23272f;
  --border-strong: #2f343d;
  --text: #e6e8eb;
  --text-dim: #9aa3ad;
  --text-muted: #6b7480;
  --accent: #10b981;
  --accent-dim: #0d8f66;
  --link: #7cc3ff;
  --code-bg: #0f1217;
  --chip-border: rgba(255, 255, 255, 0.25);
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono", Menlo, Consolas, monospace;
  --sidebar-w: 320px;
  --header-h: 56px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- topbar ---------- */
.topbar {
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}
.brand-link:hover { text-decoration: none; }
.brand-mark {
  color: var(--accent);
  font-size: 18px;
}
.topnav { display: flex; gap: 4px; }
.nav-link {
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--text-dim);
  font-weight: 500;
}
.nav-link:hover { color: var(--text); background: rgba(255,255,255,0.04); text-decoration: none; }
.nav-link-active { color: var(--text); background: rgba(16, 185, 129, 0.08); }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}

/* ---------- sidebar ---------- */
.sidebar {
  border-right: 1px solid var(--border);
  overflow-y: auto;
  background: var(--bg-elev);
}
.search {
  position: sticky;
  top: 0;
  padding: 12px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  z-index: 1;
}
#search {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
}
#search:focus { border-color: var(--accent); }

.design-list { padding: 8px 0 24px; }
.category {
  padding: 14px 16px 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.design-link {
  display: block;
  padding: 8px 16px;
  color: var(--text-dim);
  border-left: 2px solid transparent;
  cursor: pointer;
  font-size: 13.5px;
}
.design-link:hover {
  color: var(--text);
  background: rgba(255,255,255,0.03);
  text-decoration: none;
}
.design-link-active {
  color: var(--text);
  background: rgba(16, 185, 129, 0.06);
  border-left-color: var(--accent);
  font-weight: 600;
}
.design-link .design-link-blurb {
  display: block;
  font-size: 11.5px;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.4;
}

/* ---------- content ---------- */
.content {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.empty-state {
  margin: auto;
  max-width: 520px;
  padding: 60px 24px;
  text-align: center;
  color: var(--text-dim);
}
.empty-state h1 { color: var(--text); font-size: 24px; margin: 0 0 12px; }

.design-view {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.design-header {
  padding: 20px 28px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  background: var(--bg-elev);
}
.design-title h1 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.design-blurb {
  margin: 0;
  color: var(--text-dim);
  font-size: 13px;
  max-width: 720px;
}
.design-actions { flex-shrink: 0; }

.btn {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  background: var(--accent);
  color: #04110c;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  border: 0;
}
.btn:hover { background: #12cc8f; text-decoration: none; }

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  gap: 2px;
  padding: 0 20px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}
.tab {
  background: transparent;
  border: 0;
  color: var(--text-dim);
  padding: 10px 14px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.panels {
  flex: 1;
  min-height: 0;
  position: relative;
}
.panel {
  position: absolute;
  inset: 0;
  overflow: auto;
}
.panel-preview { overflow: hidden; }
.panel-preview iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

/* ---------- markdown content ---------- */
.panel-markdown {
  padding: 28px 32px 80px;
  max-width: 980px;
}
.panel-markdown h1,
.panel-markdown h2,
.panel-markdown h3,
.panel-markdown h4 {
  color: var(--text);
  letter-spacing: -0.01em;
}
.panel-markdown h1 { font-size: 26px; margin: 0 0 16px; }
.panel-markdown h2 {
  font-size: 20px;
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.panel-markdown h3 { font-size: 16px; margin: 20px 0 10px; }
.panel-markdown h4 { font-size: 14px; margin: 16px 0 8px; color: var(--text-dim); }
.panel-markdown p, .panel-markdown li { color: var(--text); }
.panel-markdown ul, .panel-markdown ol { padding-left: 22px; }
.panel-markdown li { margin: 4px 0; }
.panel-markdown code {
  font-family: var(--font-mono);
  background: var(--code-bg);
  color: #e6e8eb;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12.5px;
  border: 1px solid var(--border);
}
.panel-markdown pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: 6px;
  overflow: auto;
  font-size: 12.5px;
}
.panel-markdown pre code {
  background: transparent;
  border: 0;
  padding: 0;
}
.panel-markdown table {
  border-collapse: collapse;
  width: 100%;
  margin: 14px 0;
  font-size: 13px;
  display: block;
  overflow-x: auto;
}
.panel-markdown th, .panel-markdown td {
  padding: 8px 12px;
  border: 1px solid var(--border);
  text-align: left;
}
.panel-markdown th { background: var(--bg-elev); font-weight: 600; }
.panel-markdown blockquote {
  margin: 14px 0;
  padding: 8px 14px;
  border-left: 3px solid var(--accent);
  color: var(--text-dim);
  background: rgba(16, 185, 129, 0.04);
  border-radius: 0 4px 4px 0;
}
.panel-markdown a { color: var(--link); }

/* color swatch chip inside markdown */
.swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-right: 6px;
  vertical-align: -1px;
  border: 1px solid var(--chip-border);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.3) inset;
}

/* ---------- fonts page ---------- */
.fonts-page {
  padding: 28px 32px 80px;
  max-width: 1040px;
  margin: 0 auto;
}
.fonts-page h1 {
  font-size: 24px;
  margin: 0 0 8px;
}
.fonts-intro {
  color: var(--text-dim);
  margin: 0 0 20px;
}
.fonts-tabs {
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}
.fonts-tab {
  background: transparent;
  border: 0;
  color: var(--text-dim);
  padding: 10px 14px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.fonts-tab[aria-selected="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.fonts-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13.5px;
}
.fonts-table th,
.fonts-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.fonts-table th {
  font-weight: 600;
  color: var(--text-dim);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.fonts-table tr:hover td { background: rgba(255,255,255,0.02); }
.fonts-table .role {
  color: var(--text-dim);
  font-size: 12px;
}
.fonts-table .family {
  font-family: var(--font-mono);
  font-size: 13px;
}
.fonts-table .design-name { font-weight: 600; }
.fonts-table a { color: var(--link); }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}