/* NVIDIA-inspired dark theme — tokens from awesome-design-md/nvidia/DESIGN.md */
:root {
  --bg: #000000;
  --card: #1a1a1a;
  --fg: #ffffff;
  --fg-dim: #a7a7a7;
  --fg-dimmer: #898989;
  --fg-muted: #757575;
  --accent: #76b900;
  --accent-light: #bff230;
  --link-hover: #3860be;
  --warn: #df6500;
  --danger: #e52020;
  --border: #5e5e5e;
  --border-subtle: #2e2e2e;
  --radius: 2px;
  --shadow: rgba(0, 0, 0, 0.3) 0px 0px 5px 0px;
  --font: Arial, Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", Menlo, Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
}

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

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: 1920px;
  margin: 0 auto;
  padding: 12px 32px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.logo:hover { color: var(--fg); }
.logo-mark {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 1px;
}

/* ---------- Search ---------- */
.search { position: relative; margin-left: auto; flex: 0 1 360px; }

#search-input {
  width: 100%;
  padding: 8px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-family: var(--font);
  font-size: 14px;
  outline: none;
}
#search-input:focus { border-color: var(--accent); }
#search-input::placeholder { color: var(--fg-muted); }

#search-results {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: min(480px, 92vw);
  max-height: 70vh;
  overflow-y: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.search-hit {
  display: block;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
}
.search-hit:last-child { border-bottom: none; }
.search-hit:hover { background: #242424; color: var(--fg); }
.search-hit .hit-title { font-weight: 700; font-size: 15px; }
.search-hit .hit-snippet {
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-dim);
}
.search-hit .hit-topic {
  margin-left: 8px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent);
}
.search-hit mark {
  background: rgba(118, 185, 0, 0.25);
  color: var(--accent-light);
}
.search-empty { padding: 14px; font-size: 14px; color: var(--fg-muted); }

/* ---------- Topic nav ---------- */
.topic-nav { border-top: 1px solid var(--border-subtle); }
.topic-nav-inner {
  max-width: 1920px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scrollbar-width: none;
}
.topic-nav-inner::-webkit-scrollbar { display: none; }
.topic-nav-inner a {
  padding: 9px 0;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--fg-dim);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.topic-nav-inner a:hover { color: var(--fg); }
.topic-nav-inner a.active { color: var(--fg); border-bottom-color: var(--accent); }

/* ---------- Layout ---------- */
.main {
  max-width: 1920px;
  margin: 0 auto;
  padding: 32px 32px 64px;
  min-height: 60vh;
}

/* ---------- Hero ---------- */
.hero { padding: 24px 0 8px; }
.hero h1 {
  margin: 0;
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
}
.hero-sub { margin: 10px 0 0; font-size: 16px; color: var(--fg-dim); }
.hero-topic { padding-top: 8px; }

.section { margin-top: 40px; }

.section-label {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent);
}

/* ---------- Topic cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.card:hover {
  color: var(--fg);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card h3 { margin: 0; font-size: 18px; font-weight: 700; line-height: 1.25; }
.card p { margin: 8px 0 0; font-size: 14px; color: var(--fg-dimmer); }

/* ---------- Lists (recent / topic page) ---------- */
.recent-list, .note-list { margin: 0; padding: 0; list-style: none; }

.recent-list li, .note-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.recent-list a, .note-list a { font-size: 15px; font-weight: 700; }

.recent-meta { display: flex; align-items: baseline; gap: 12px; white-space: nowrap; }
.tag {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1px 6px;
}
.date { font-size: 13px; color: var(--fg-muted); white-space: nowrap; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: 13px; color: var(--fg-muted); margin-bottom: 8px; }
.breadcrumb a { color: var(--fg-dim); }
.breadcrumb a:hover { color: var(--link-hover); }
.breadcrumb span { margin: 0 6px; }

/* ---------- Article layout ---------- */
.article-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 240px;
  gap: 48px;
  align-items: start;
}
.article-layout.no-toc { grid-template-columns: 280px minmax(0, 1fr); }

.article { min-width: 0; max-width: 1080px; }

.article-title {
  margin: 4px 0 0;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.25;
}
.article-meta {
  margin: 10px 0 0;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--accent);
  font-size: 13px;
  color: var(--fg-muted);
  display: flex;
  gap: 16px;
}
.article-meta a { color: var(--fg-dimmer); text-decoration: underline; text-decoration-color: var(--border); }
.article-meta a:hover { color: var(--link-hover); }

/* ---------- Article body ---------- */
.article-body { margin-top: 24px; font-size: 16px; line-height: 1.67; }

.article-body h1, .article-body h2, .article-body h3,
.article-body h4, .article-body h5 {
  font-weight: 700;
  line-height: 1.25;
  margin: 1.8em 0 0.6em;
}
.article-body h1 { font-size: 26px; }
.article-body h2 {
  font-size: 22px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}
.article-body h3 { font-size: 18px; }
.article-body h4 { font-size: 16px; }

.article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.article-body a:hover { color: var(--link-hover); }

.article-body p { margin: 0.8em 0; }
.article-body ul, .article-body ol { padding-left: 1.6em; margin: 0.8em 0; }
.article-body li { margin: 0.25em 0; }

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.article-body blockquote {
  margin: 1em 0;
  padding: 2px 16px;
  border-left: 3px solid var(--border);
  color: var(--fg-dim);
}

.article-body hr { border: none; border-top: 1px solid var(--border-subtle); margin: 2em 0; }

.article-body mark {
  background: rgba(118, 185, 0, 0.22);
  color: var(--accent-light);
  padding: 0 2px;
  border-radius: 1px;
}

/* Code */
.article-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1px 5px;
  color: var(--accent-light);
}
.article-body .highlight {
  background: var(--card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  margin: 1em 0;
  overflow-x: auto;
}
.article-body .highlight pre {
  margin: 0;
  padding: 14px 16px;
  background: transparent;
  line-height: 1.5;
}
.article-body .highlight code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: 13.5px;
}
.article-body pre { overflow-x: auto; }

/* Tables */
.article-body table {
  border-collapse: collapse;
  margin: 1em 0;
  display: block;
  overflow-x: auto;
  max-width: 100%;
  font-size: 14px;
}
.article-body th, .article-body td {
  border: 1px solid var(--border-subtle);
  padding: 8px 12px;
  text-align: left;
}
.article-body th { background: var(--card); font-weight: 700; white-space: nowrap; }
.article-body tr:nth-child(even) td { background: #0d0d0d; }

/* Callouts */
.callout {
  margin: 1em 0;
  padding: 12px 16px;
  background: var(--card);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
}
.callout-title {
  margin: 0 0 6px !important;
  font-weight: 700;
  font-size: 15px;
  color: var(--accent);
}
.callout > :last-child { margin-bottom: 0; }
.callout-warning, .callout-caution, .callout-important, .callout-attention {
  border-left-color: var(--warn);
}
.callout-warning .callout-title, .callout-caution .callout-title,
.callout-important .callout-title, .callout-attention .callout-title { color: var(--warn); }
.callout-danger, .callout-error, .callout-bug, .callout-failure {
  border-left-color: var(--danger);
}
.callout-danger .callout-title, .callout-error .callout-title,
.callout-bug .callout-title, .callout-failure .callout-title { color: var(--danger); }

/* ---------- Sidebar ---------- */
.sidebar { position: sticky; top: 96px; max-height: calc(100vh - 120px); overflow-y: auto; }

.sidebar-details summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--fg);
  padding: 4px 0 10px;
  list-style: none;
}
.sidebar-details summary::-webkit-details-marker { display: none; }

.sidebar-group {
  margin: 14px 0 6px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--fg-dimmer);
}
.sidebar-nav ul { margin: 0; padding: 0; list-style: none; }
.sidebar-nav li { margin: 0; }
.sidebar-nav a {
  display: block;
  padding: 4px 8px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--fg-dim);
  border-left: 2px solid var(--border-subtle);
  border-radius: 0;
}
.sidebar-nav a:hover { color: var(--fg); border-left-color: var(--border); }
.sidebar-nav a.current { color: var(--accent); border-left-color: var(--accent); font-weight: 700; }

/* ---------- TOC ---------- */
.toc {
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  font-size: 13px;
}
.toc-label {
  margin: 4px 0 8px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--fg-dimmer);
}
.toc ul { margin: 0; padding-left: 0; list-style: none; }
.toc ul ul { padding-left: 14px; }
.toc li { margin: 3px 0; }
.toc a { color: var(--fg-dim); display: block; padding: 2px 0; line-height: 1.4; }
.toc a:hover { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border-subtle); }
.footer-inner {
  max-width: 1920px;
  margin: 0 auto;
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--fg-muted);
}
.footer-inner a { color: var(--fg-dim); }
.footer-inner a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 1199px) {
  .article-layout, .article-layout.no-toc { grid-template-columns: 230px minmax(0, 1fr); gap: 28px; }
  .toc { display: none; }
}

@media (max-width: 768px) {
  .header-inner { flex-wrap: wrap; gap: 12px; padding: 10px 16px; }
  .search { flex: 1 1 100%; order: 3; }
  .main { padding: 20px 16px 48px; }
  .hero h1 { font-size: 26px; }

  .article-layout, .article-layout.no-toc { display: block; }
  .sidebar { position: static; max-height: none; margin-bottom: 20px; }
  .sidebar-details { border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: 10px 14px; }
  .sidebar-details:not([open]) { padding-bottom: 10px; }
  .sidebar-details summary { padding-bottom: 0; }
  .sidebar-details[open] summary { padding-bottom: 8px; }

  .article-title { font-size: 24px; }
  .recent-list li, .note-list li { flex-direction: column; gap: 2px; }
  .recent-meta { gap: 8px; }
}