:root {
  --bg: #fbfbfa;
  --fg: #111113;
  --muted: #6b6b72;
  --faint: #a1a1a8;
  --line: #ebebea;
  --surface: #ffffff;
  --code-bg: #f5f5f4;
  --accent: oklch(0.55 0.17 150);
  --tip-bg: #ffffff;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.04), 0 8px 24px -12px rgb(0 0 0 / 0.12);
  --tok-str: oklch(0.5 0.12 150);
  --tok-num: oklch(0.55 0.14 55);
  --radius: 10px;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0b0c;
    --fg: #ededee;
    --muted: #8b8b92;
    --faint: #55555c;
    --line: #1d1d20;
    --surface: #101012;
    --code-bg: #111113;
    --accent: oklch(0.78 0.16 150);
    --tip-bg: #141416;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.4), 0 12px 32px -12px rgb(0 0 0 / 0.6);
    --tok-str: oklch(0.8 0.1 150);
    --tok-num: oklch(0.8 0.11 60);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b0b0c;
  --fg: #ededee;
  --muted: #8b8b92;
  --faint: #55555c;
  --line: #1d1d20;
  --surface: #101012;
  --code-bg: #111113;
  --accent: oklch(0.78 0.16 150);
  --tip-bg: #141416;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 15px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
}

a { color: inherit; text-decoration-color: var(--faint); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--fg); }
::selection { background: color-mix(in oklch, var(--accent) 30%, transparent); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* Header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.top.scrolled { border-bottom-color: var(--line); }
.top-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 24px;
  height: 56px; display: flex; align-items: center; justify-content: space-between;
}
.mark { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 500; letter-spacing: -0.01em; }
.logo { width: 18px; height: 18px; border-radius: 4px; image-rendering: pixelated; }
.top-links { display: flex; gap: 24px; font-size: 14px; }
.top-links a { color: var(--muted); text-decoration: none; transition: color .15s; }
.top-links a:hover { color: var(--fg); }

/* GitHub stars */
:root { --star: oklch(0.82 0.16 85); }
.top-links { align-items: center; }
.gh-stars { display: inline-flex; align-items: center; gap: 8px; }
.top-links .gh-stars-link { display: inline-flex; }
.gh-stars-logo { width: 16px; height: 16px; flex: none; }
.gh-stars-count {
  display: inline-flex; align-items: center; gap: 4px;
  font: 500 12.5px/1 var(--mono); font-variant-numeric: tabular-nums;
  opacity: 0; transition: opacity .3s;
}
.is-loaded .gh-stars-count { opacity: 1; }
.is-failed .gh-stars-count { display: none; }
.gh-stars-particles { position: relative; display: inline-flex; width: 13px; height: 13px; }
.gh-stars-star { width: 13px; height: 13px; overflow: visible; }
.gh-stars-star .o { fill: none; stroke: currentColor; stroke-width: 2; stroke-linejoin: round; }
.gh-stars-star .f {
  fill: var(--star); stroke: var(--star); stroke-width: 2; stroke-linejoin: round;
  clip-path: inset(calc((1 - var(--fill, 0)) * 100%) 0 0 0);
}
.is-complete > .gh-stars-count .gh-stars-star:first-child .o { stroke: var(--star); }
.is-complete > .gh-stars-count .gh-stars-star:first-child { animation: gh-pop .45s cubic-bezier(.3, 1.6, .5, 1); }
.gh-stars-particle { position: absolute; inset: 0; pointer-events: none; animation: gh-fly .75s cubic-bezier(.2, .7, .3, 1) forwards; }
.gh-stars-particle .o { display: none; }
.gh-stars-particle .f { clip-path: none; }
@keyframes gh-pop { 40% { transform: scale(1.35); } }
@keyframes gh-fly {
  from { transform: translate(0, 0) scale(.7) rotate(0); opacity: 1; }
  to { transform: translate(var(--dx), var(--dy)) scale(.25) rotate(var(--r)); opacity: 0; }
}
.gh-btn .gh-stars-count { margin-left: 2px; padding-left: 10px; height: 18px; border-left: 1px solid var(--line); color: var(--muted); }
.gh-btn:hover .gh-stars-count { color: var(--fg); }
@media (prefers-reduced-motion: reduce) {
  .gh-stars-particle, .is-complete > .gh-stars-count .gh-stars-star:first-child { animation: none; }
}

/* Hero */
.hero { max-width: 1080px; margin: 0 auto; padding: 96px 24px 40px; }
.eyebrow { margin: 0 0 20px; font: 500 12px/1 var(--mono); letter-spacing: .04em; color: var(--muted); text-transform: uppercase; }
h1 {
  margin: 0; font-weight: 500; font-size: clamp(40px, 7vw, 68px);
  line-height: 1.02; letter-spacing: -0.045em;
}
.lede { max-width: 520px; margin: 24px 0 0; font-size: 17px; line-height: 1.6; color: var(--muted); }
.actions { display: flex; gap: 10px; margin-top: 32px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; height: 38px; padding: 0 16px;
  border-radius: 8px; border: 1px solid var(--line); background: var(--surface);
  font-size: 14px; font-weight: 500; text-decoration: none; transition: border-color .15s, transform .15s;
}
.btn:hover { border-color: var(--faint); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn.primary:hover { opacity: .9; }

.hero-figure {
  margin: 72px 0 0; padding: 28px 28px 20px;
  border: 1px solid var(--line); border-radius: 14px; background: var(--surface);
}
.chart-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.chart-title { font-weight: 500; letter-spacing: -0.01em; }
.chart-sub { font-size: 13px; color: var(--muted); }
.legend { display: flex; gap: 6px; flex-wrap: wrap; }
.legend button {
  display: inline-flex; align-items: center; gap: 8px; height: 28px; padding: 0 10px;
  border: 0; border-radius: 6px; background: transparent; color: var(--muted);
  font: 500 13px var(--sans); cursor: pointer; transition: color .15s, background .15s;
}
.legend button:hover { background: var(--code-bg); color: var(--fg); }
.legend button[aria-pressed="true"] { color: var(--fg); background: var(--code-bg); }
.legend .sw { width: 10px; height: 10px; border-radius: 2px; }
.hero-stage { position: relative; height: 280px; cursor: crosshair; }
.hero-stage canvas, .stage canvas { display: block; width: 100%; height: 100%; }
.xlabels { position: relative; height: 22px; margin-top: 10px; font: 12px var(--mono); color: var(--faint); }
.xlabels span { position: absolute; transform: translateX(-50%); transition: color .15s; }
.xlabels span.on { color: var(--fg); }
.tip {
  position: absolute; top: 8px; left: 0; min-width: 150px; padding: 10px 12px;
  background: var(--tip-bg); border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow);
  font-size: 12px; pointer-events: none; will-change: transform;
}
.tip .t { font-weight: 500; margin-bottom: 6px; }
.tip .r { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--muted); }
.tip .r span:first-child { display: inline-flex; align-items: center; gap: 8px; }
.tip .r b { color: var(--fg); font: 500 12px var(--mono); }
.tip .sw { width: 8px; height: 8px; border-radius: 2px; }

/* Doc layout */
.doc { max-width: 1080px; margin: 0 auto; padding: 56px 24px 0; display: grid; grid-template-columns: 1fr; gap: 64px; }
@media (min-width: 1000px) { .doc { grid-template-columns: 180px minmax(0, 1fr); } }
.toc { display: none; }
@media (min-width: 1000px) {
  .toc { display: flex; flex-direction: column; gap: 2px; position: sticky; top: 96px; align-self: start; font-size: 13px; }
}
.toc a { color: var(--faint); text-decoration: none; padding: 5px 0 5px 14px; border-left: 1px solid var(--line); transition: color .15s, border-color .15s; }
.toc a:hover { color: var(--fg); }
.toc a.on { color: var(--fg); border-left-color: var(--fg); }

.content { max-width: 720px; min-width: 0; }
.content section { padding: 48px 0; border-top: 1px solid var(--line); }
.content section:first-child { border-top: 0; padding-top: 0; }
h2 { margin: 0 0 12px; font-size: 24px; font-weight: 500; letter-spacing: -0.025em; }
h3 { margin: 0; font-size: 15px; font-weight: 500; letter-spacing: -0.01em; }
.h4 { margin: 32px 0 6px; }
p { margin: 0 0 16px; color: var(--muted); }
p strong, li strong { color: var(--fg); font-weight: 500; }
.big { font-size: 19px; line-height: 1.6; color: var(--fg); letter-spacing: -0.01em; }
.note { font-size: 13px; color: var(--faint); }
.note a { color: var(--muted); }

.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 32px; margin: 40px 0 0; }
.facts dt { font-weight: 500; margin-bottom: 4px; }
.facts dd { margin: 0; color: var(--muted); font-size: 14px; }

code { font: 13px/1.5 var(--mono); }
:not(pre) > code { padding: 2px 5px; border-radius: 5px; background: var(--code-bg); border: 1px solid var(--line); font-size: 12.5px; color: var(--fg); }
pre {
  position: relative; margin: 20px 0; padding: 18px 20px; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius);
}
pre code { color: var(--fg); white-space: pre; }
.tok-c { color: var(--faint); }
.tok-k { color: var(--muted); }
.tok-s { color: var(--tok-str); }
.tok-n { color: var(--tok-num); }
.copy {
  position: absolute; top: 10px; right: 10px; height: 26px; padding: 0 9px;
  border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--muted);
  font: 500 11px var(--sans); cursor: pointer; opacity: 0; transition: opacity .15s, color .15s;
}
pre:hover .copy, pre.cmd .copy, .copy:focus-visible { opacity: 1; }
pre.cmd code::before { content: "$ "; color: var(--faint); }
@media (hover: none) { .copy { opacity: 1; } }
.copy:hover { color: var(--fg); }

/* Specimens */
.specimens { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 32px; }
@media (min-width: 640px) { .specimens { grid-template-columns: 1fr 1fr; } .spec.wide { grid-column: 1 / -1; } }
.spec { margin: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); overflow: hidden; }
.stage { position: relative; height: 220px; border-bottom: 1px solid var(--line); }
.stage.center { display: flex; align-items: center; justify-content: center; }
.stage.col { flex-direction: column; gap: 18px; }
.stage.pad { padding: 28px; display: flex; flex-direction: column; justify-content: center; gap: 16px; }
.stage canvas.sq { width: 168px; height: 168px; }
.stage canvas.spark { height: 56px; }
.stage canvas.avatar { width: 88px; height: 88px; border-radius: 10px; }
.figcap, figcaption { padding: 18px 20px 20px; }
figcaption p { font-size: 13.5px; margin: 4px 0 12px; }
figcaption code { font-size: 11.5px; color: var(--faint); background: none; border: 0; padding: 0; }
.pie-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; pointer-events: none; }
.pie-center b { font: 500 20px var(--sans); letter-spacing: -0.02em; }
.pie-center span { font-size: 11px; color: var(--muted); }

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-label { font-size: 12px; color: var(--muted); }
.stat-value { font-size: 26px; font-weight: 500; letter-spacing: -0.03em; }
.stat-value em { font: 500 12px var(--mono); font-style: normal; color: var(--accent); margin-left: 6px; letter-spacing: 0; vertical-align: middle; }

.buttons { gap: 10px; flex-wrap: wrap; padding: 0 16px; }
.dbtn {
  position: relative; height: 38px; padding: 0 18px; border: 0; border-radius: 8px; overflow: hidden;
  background: transparent; color: var(--fg); font: 500 14px var(--sans); cursor: pointer;
}
.dbtn canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.dbtn span { position: relative; }
.dbtn[data-style="solid"] span { color: #fff; }

.field {
  width: 200px; height: 34px; padding: 0 12px; text-align: center;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg);
  font: 13px var(--sans); transition: border-color .15s;
}
.field:focus { outline: none; border-color: var(--faint); }

.gradients { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 20px; }
.gradients canvas { border-radius: 6px; }

.stage.bg { height: 260px; background: #0b0b0c; }
.seg {
  position: absolute; left: 50%; bottom: 16px; transform: translateX(-50%);
  display: flex; gap: 2px; padding: 3px; border-radius: 9px;
  background: rgb(11 11 12 / 0.72); border: 1px solid rgb(255 255 255 / 0.08);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.seg button {
  height: 28px; padding: 0 12px; border: 0; border-radius: 6px; background: transparent;
  color: rgb(255 255 255 / 0.55); font: 500 12px var(--sans); cursor: pointer; transition: color .15s, background .15s;
}
.seg button:hover { color: #fff; }
.seg button[aria-pressed="true"] { background: rgb(255 255 255 / 0.1); color: #fff; }

.stage.meters { height: auto; padding: 36px 28px; gap: 18px; }
.meters canvas { height: 10px; }

.tones { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; margin: 16px 0 8px; }
.tone { display: flex; flex-direction: column; gap: 8px; font: 11.5px var(--mono); color: var(--muted); }
.tone canvas { width: 100%; height: 56px; border-radius: 6px; }
.fills { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 12px 0 32px; }
.fills .tone canvas { height: 64px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
td { padding: 12px 0; border-top: 1px solid var(--line); color: var(--muted); vertical-align: top; }
td:first-child { width: 120px; }
td code { margin-right: 2px; }

ul.plain { list-style: none; padding: 0; margin: 8px 0 0; display: grid; gap: 14px; }
ul.plain li { color: var(--muted); padding-left: 18px; position: relative; }
ul.plain li::before { content: ""; position: absolute; left: 0; top: .7em; width: 6px; height: 6px; background: var(--faint); }

.foot { margin-top: 64px; border-top: 1px solid var(--line); }
.foot-inner { max-width: 1080px; margin: 0 auto; padding: 32px 24px 48px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; }
.muted { color: var(--muted); }

@media (max-width: 640px) {
  .hero { padding-top: 64px; }
  .hero-figure { padding: 20px 16px 14px; margin-top: 48px; }
  .hero-stage { height: 220px; }
  .top-links { gap: 16px; }
  .tones { grid-template-columns: repeat(4, 1fr); }
  .fills { grid-template-columns: repeat(2, 1fr); }
  .xlabels span:nth-child(even) { display: none; }
}