:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-accent: #ecfbfd;
  --line: #e3e8ee;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #64748b;
  --brand: #0891a5;
  --brand-solid: #18c1d6;
  --brand-ink: #062a30;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --radius: 10px;
  --wrap: 1120px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1016; --bg-soft: #121922; --bg-accent: #0d2a30; --line: #1f2a37;
    --text: #e6edf3; --text-2: #a7b4c2; --text-3: #8695a5;
    --brand: #4fd6e6; --brand-solid: #18c1d6; --code-bg: #060a0f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b1016; --bg-soft: #121922; --bg-accent: #0d2a30; --line: #1f2a37;
  --text: #e6edf3; --text-2: #a7b4c2; --text-3: #8695a5;
  --brand: #4fd6e6; --brand-solid: #18c1d6; --code-bg: #060a0f;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.35; text-wrap: balance; margin: 0; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--brand-solid); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; z-index: 50; background: var(--bg); padding: 6px 10px; }

.g-wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

/* 顶栏 */
.g-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.g-header-in { display: flex; align-items: center; gap: 24px; height: 60px; }
.g-brand { display: flex; align-items: center; gap: 8px; color: var(--text); font-size: 17px; white-space: nowrap; }
.g-brand:hover { text-decoration: none; }
.g-brand span:last-child { color: var(--text-3); font-size: 14px; }
.g-mark { width: 22px; height: 22px; border-radius: 6px; background: linear-gradient(135deg, var(--brand-solid), #0e7c8c); position: relative; }
.g-mark::after { content: ""; position: absolute; inset: 6px 5px; border-left: 3px solid #fff; border-bottom: 3px solid #fff; border-radius: 1px; transform: skew(-8deg); opacity: .95; }
.g-nav { display: flex; gap: 20px; flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.g-nav a { color: var(--text-2); font-size: 14px; white-space: nowrap; }
.g-nav a:hover { color: var(--text); text-decoration: none; }
.g-tools { display: flex; align-items: center; gap: 8px; }
.g-search-btn { display: flex; align-items: center; gap: 8px; height: 34px; padding: 0 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-soft); color: var(--text-3); font-size: 13px; }
.g-search-btn kbd { font: 12px ui-monospace, monospace; border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; background: var(--bg); }
.g-icon-btn { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--text-2); }
.g-cta { display: inline-flex; align-items: center; height: 34px; padding: 0 14px; border-radius: 8px; background: var(--brand-solid); color: var(--brand-ink); font-size: 14px; font-weight: 600; white-space: nowrap; }
.g-cta:hover { text-decoration: none; filter: brightness(1.06); }
.g-ghost { display: inline-flex; align-items: center; height: 34px; padding: 0 14px; border-radius: 8px; border: 1px solid var(--line); color: var(--text); font-size: 14px; white-space: nowrap; }
.g-ghost:hover { text-decoration: none; background: var(--bg-soft); }

/* 首页 */
.g-hero { padding: 64px 0 40px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, var(--bg-accent), var(--bg) 85%); }
.g-kicker { color: var(--brand); font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.g-hero h1 { font-size: clamp(28px, 4.4vw, 42px); letter-spacing: -.01em; max-width: 18em; }
.g-lead { color: var(--text-2); font-size: 17px; max-width: 46em; margin-top: 16px; }
.g-stats { display: flex; flex-wrap: wrap; gap: 12px 40px; margin: 32px 0 0; }
.g-stats dt { color: var(--text-3); font-size: 13px; }
.g-stats dd { margin: 0; font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; }

.g-section { padding-top: 48px; }
.g-section-head { margin-bottom: 16px; }
.g-section-head h2 { font-size: 22px; }
.g-section-head h2 a { color: var(--text); }
.g-section-head p { color: var(--text-3); font-size: 14px; margin-top: 4px; }

.g-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 12px; }
.g-item a { display: flex; flex-direction: column; gap: 8px; height: 100%; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--text); background: var(--bg); transition: border-color .15s, background .15s; }
.g-item a:hover { text-decoration: none; border-color: var(--brand-solid); background: var(--bg-accent); }
.g-item h3 { font-size: 16px; font-weight: 650; }
.g-item p { color: var(--text-2); font-size: 14px; line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.g-item-meta { color: var(--text-3); font-size: 12px; margin-top: auto; }

.g-cta-block { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; margin: 56px 0; padding: 28px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg-soft); }
.g-cta-block h2 { font-size: 19px; }
.g-cta-block p { color: var(--text-2); font-size: 14px; margin-top: 6px; }
.g-cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* 专题页 */
.g-topic { padding-top: 40px; }
.g-topic h1 { font-size: clamp(26px, 4vw, 34px); margin-top: 12px; }
.g-topic .g-list { margin-top: 28px; }
.g-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.g-chips a { border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: 13px; color: var(--text-2); }
.g-chips a span { color: var(--text-3); }
.g-crumb { display: flex; flex-wrap: wrap; gap: 8px; color: var(--text-3); font-size: 13px; }
.g-crumb a { color: var(--text-3); }

/* 文章页 */
.g-article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 56px; padding-top: 36px; }
.g-article { min-width: 0; max-width: 760px; }
.g-article h1 { font-size: clamp(26px, 4vw, 36px); letter-spacing: -.01em; margin-top: 14px; }
.g-meta { display: flex; flex-wrap: wrap; gap: 4px 16px; color: var(--text-3); font-size: 13px; margin-top: 14px; }
.g-answer { margin: 24px 0 8px; padding: 18px 20px; border: 1px solid color-mix(in srgb, var(--brand-solid) 45%, var(--line)); border-radius: var(--radius); background: var(--bg-accent); }
.g-answer-label { color: var(--brand); font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.g-answer p:last-child { font-size: 17px; line-height: 1.75; }

.g-prose { font-size: 16px; overflow-wrap: break-word; }
.g-prose > * + * { margin-top: 16px; }
.g-prose h2 { font-size: 23px; margin-top: 44px; padding-top: 4px; }
.g-prose h3 { font-size: 18px; margin-top: 28px; }
.g-prose p { color: var(--text); }
.g-prose ul, .g-prose ol { padding-left: 1.4em; }
.g-prose ul { list-style: disc; }
.g-prose ol { list-style: decimal; }
.g-prose li + li { margin-top: 6px; }
.g-prose li::marker { color: var(--text-3); }
.g-prose a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--brand) 40%, transparent); }
.g-prose strong { font-weight: 650; }
.g-prose blockquote { margin: 16px 0 0; padding: 4px 16px; border-left: 3px solid var(--line); color: var(--text-2); }
.g-prose code { font: 0.875em/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; }
.g-prose pre { background: var(--code-bg); color: var(--code-text); border-radius: var(--radius); padding: 16px 18px; overflow-x: auto; border: 1px solid var(--line); }
.g-prose pre code { background: none; border: 0; padding: 0; font-size: 13.5px; line-height: 1.7; color: inherit; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.g-prose table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.g-prose th, .g-prose td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.g-prose th { background: var(--bg-soft); font-weight: 650; white-space: nowrap; }
.g-prose tr:last-child td { border-bottom: 0; }

.g-article-foot { margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--text-3); font-size: 13px; }
.g-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.g-tags li { border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; font-size: 12px; color: var(--text-2); }
.g-tags .is-model { font-family: ui-monospace, Menlo, monospace; }
.g-tags a { color: inherit; }

.g-aside { position: sticky; top: 84px; align-self: start; font-size: 13.5px; }
.g-toc p { color: var(--text-3); font-size: 12px; font-weight: 600; margin-bottom: 10px; }
.g-toc ol { border-left: 1px solid var(--line); }
.g-toc a { display: block; padding: 4px 0 4px 14px; margin-left: -1px; border-left: 1px solid transparent; color: var(--text-2); line-height: 1.5; }
.g-toc a:hover { color: var(--text); border-left-color: var(--brand-solid); text-decoration: none; }
.g-aside-cta { display: flex; align-items: center; gap: 6px; margin-top: 20px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; color: var(--text); font-weight: 600; }
.g-aside-cta:hover { border-color: var(--brand-solid); text-decoration: none; }
.g-related { padding-top: 56px; }

/* 页脚 */
.g-footer { border-top: 1px solid var(--line); background: var(--bg-soft); color: var(--text-3); font-size: 13px; }
.g-footer-in { display: grid; grid-template-columns: minmax(0, 2fr) 1fr 1fr; gap: 32px; padding-top: 36px; padding-bottom: 40px; }
.g-footer-brand { color: var(--text); font-weight: 650; font-size: 14px; }
.g-footer p + p { margin-top: 8px; }
.g-footer li + li { margin-top: 6px; }
.g-footer a { color: var(--text-2); }

/* 搜索 */
.g-search { width: min(640px, calc(100vw - 32px)); margin-top: 12vh; padding: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--bg); color: var(--text); box-shadow: 0 24px 60px rgba(0, 0, 0, .25); }
.g-search::backdrop { background: rgba(8, 12, 18, .5); }
.g-search form { display: flex; gap: 8px; padding: 12px; border-bottom: 1px solid var(--line); }
.g-search input { flex: 1; min-width: 0; height: 40px; padding: 0 12px; border: 0; background: transparent; color: var(--text); font: inherit; outline: none; }
.g-search form button { border: 1px solid var(--line); border-radius: 6px; background: var(--bg-soft); color: var(--text-3); font-size: 12px; padding: 0 8px; }
.g-search ul { max-height: 52vh; overflow-y: auto; padding: 8px; }
.g-search ul:empty::after { content: attr(data-empty); display: block; padding: 16px; color: var(--text-3); font-size: 14px; }
.g-search li a { display: block; padding: 10px 12px; border-radius: 8px; color: var(--text); }
.g-search li a:hover, .g-search li a:focus { background: var(--bg-accent); text-decoration: none; }
.g-search li small { display: block; color: var(--text-3); font-size: 12px; }

@media (max-width: 920px) {
  .g-article-grid { grid-template-columns: minmax(0, 1fr); }
  .g-aside { display: none; }
  .g-nav { display: none; }
  .g-header-in { justify-content: space-between; }
  .g-footer-in { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 520px) {
  .g-wrap { padding: 0 16px; }
  .g-search-btn span, .g-search-btn kbd { display: none; }
  .g-search-btn { width: 34px; padding: 0; justify-content: center; }
  .g-hero { padding: 40px 0 28px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
.g-prose td:first-child { min-width: 6.5em; }