:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --fg: #17181c;
  --fg-soft: #4b4f58;
  --muted: #6e737d;
  --line: #e4e6ea;
  --accent: #3d4fd6;
  --accent-soft: #eef0fd;
  --code-bg: #f3f4f7;
  --code-fg: #22252c;
  --radius: 10px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --bg-soft: #181b21;
    --fg: #e8e9ec;
    --fg-soft: #b5b9c2;
    --muted: #8b909b;
    --line: #2a2e36;
    --accent: #8f9bff;
    --accent-soft: #1d2140;
    --code-bg: #1a1d24;
    --code-fg: #dfe2e8;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.7 var(--sans); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.bar { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top .bar { display: flex; align-items: center; gap: 24px; height: 58px; }
.brand { font: 700 18px/1 var(--mono); color: var(--fg); letter-spacing: -0.02em; display: flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; }
.brand .mark { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 6px; background: var(--accent); color: var(--bg); font-size: 11px; }
.links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.links a { color: var(--fg-soft); font-size: 14.5px; padding: 6px 10px; border-radius: 6px; }
.links a:hover { color: var(--fg); background: var(--bg-soft); text-decoration: none; }
.links a.on { color: var(--fg); font-weight: 600; }
.links .lang { border: 1px solid var(--line); margin-left: 8px; }
.menu-toggle, .menu-button { display: none; }

/* doc pages */
.prose { max-width: 800px; margin: 0 auto; padding: 40px 20px 80px; }
.prose h1 { font-size: 34px; line-height: 1.25; letter-spacing: -0.02em; margin: 8px 0 20px; }
.prose h2 { font-size: 24px; line-height: 1.3; margin: 48px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
.prose h3 { font-size: 18.5px; margin: 32px 0 8px; }
.prose h2 + h3 { margin-top: 16px; }
.prose p, .prose li { color: var(--fg); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: 4px; }
.prose blockquote { margin: 20px 0; padding: 10px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 var(--radius) var(--radius) 0; color: var(--fg-soft); }
.prose blockquote p { margin: 4px 0; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; margin: 18px 0; font-size: 14.5px; max-width: 100%; }
.prose th, .prose td { border: 1px solid var(--line); padding: 7px 11px; text-align: left; vertical-align: top; }
.prose th { background: var(--bg-soft); font-weight: 600; white-space: nowrap; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

/* code */
code { font: 0.88em/1.5 var(--mono); background: var(--code-bg); color: var(--code-fg); padding: 0.12em 0.38em; border-radius: 5px; }
pre { max-width: 100%; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; line-height: 1.55; margin: 16px 0; }
pre code { background: none; padding: 0; font-size: 13.5px; border-radius: 0; white-space: pre; }
.highlight { background: none; }
.highlight pre { margin: 16px 0; }

/* landing */
.landing { max-width: 1080px; margin: 0 auto; padding: 0 20px 80px; }
.landing section { margin: 72px 0; }
.hero { margin-top: 64px !important; max-width: 820px; }
.eyebrow { color: var(--accent); font: 600 13px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 18px; }
.hero h1 { font-size: clamp(25px, 6.4vw, 54px); line-height: 1.12; letter-spacing: -0.03em; margin: 0 0 22px; }
.hero h1 code { font-size: 0.86em; padding: 0.04em 0.24em; background: var(--accent-soft); color: var(--accent); border-radius: 8px; }
.lede { font-size: 19px; color: var(--fg-soft); max-width: 700px; margin: 0 0 28px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 8px; border: 1px solid var(--line); color: var(--fg); font-weight: 600; font-size: 15px; }
.btn:hover { background: var(--bg-soft); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn.primary:hover { filter: brightness(1.08); background: var(--accent); }
.install { display: inline-block; margin: 0; }
.landing h2 { font-size: 26px; letter-spacing: -0.02em; margin: 0 0 12px; }
.landing h3 { font-size: 17px; margin: 0 0 6px; }
.landing p { color: var(--fg-soft); }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; }
.split > div, .grid > div, .landing section { min-width: 0; }
.split pre code { font-size: 13px; }
.levels { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 10px; }
.levels li { display: flex; gap: 16px; align-items: flex-start; padding: 14px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-soft); }
.levels .lv { font: 700 13px/1 var(--mono); color: var(--accent); background: var(--accent-soft); border-radius: 6px; padding: 7px 8px; flex: none; }
.levels b { font-size: 16px; }
.levels .size { font: 12.5px/1 var(--mono); color: var(--muted); margin-left: 8px; }
.levels p { margin: 4px 0 0; }
.levels li:nth-child(2) { margin-left: 22px; }
.levels li:nth-child(3) { margin-left: 44px; }
.levels li:nth-child(4) { margin-left: 66px; }
.levels li:nth-child(5) { margin-left: 88px; opacity: 0.8; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 32px; }
.grid p { margin: 0; font-size: 15px; }
.cards { list-style: none; padding: 0; margin: 16px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.cards a { display: block; height: 100%; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--fg); }
.cards a:hover { border-color: var(--accent); text-decoration: none; }
.cards b { display: block; margin-bottom: 4px; }
.cards span { color: var(--muted); font-size: 14.5px; }

/* footer */
.foot { border-top: 1px solid var(--line); color: var(--muted); font-size: 13.5px; }
.foot .bar { display: flex; flex-wrap: wrap; gap: 8px 24px; padding-top: 22px; padding-bottom: 32px; }
.foot a { color: var(--muted); margin-left: auto; }

/* narrow screens */
@media (max-width: 860px) {
  .split, .grid, .cards { grid-template-columns: minmax(0, 1fr); }
  .hero h1 code { padding: 0 0.12em; }
  .install { display: block; }
  .levels li:nth-child(n) { margin-left: 0; }
  .menu-button { display: block; margin-left: auto; font-size: 22px; cursor: pointer; padding: 4px 8px; color: var(--fg); }
  .links { display: none; position: absolute; top: 58px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 16px 14px; background: var(--bg); border-bottom: 1px solid var(--line); }
  .links a { padding: 10px 8px; }
  .links .lang { margin: 6px 0 0; text-align: center; }
  .menu-toggle:checked ~ .links { display: flex; }
  .prose { padding-top: 28px; }
  .prose h1 { font-size: 28px; }
  .lede { font-size: 17px; }
  .foot a { margin-left: 0; }
}