:root {
  --bg: #fbfaf7;
  --bg-2: #f3f1ec;
  --ink: #1c1917;
  --ink-2: #57534e;
  --ink-3: #8a847d;
  --line: #e4e1da;
  --accent: #c2410c;
  --accent-ink: #fff;
  --code-bg: #15130f;
  --code-ink: #ece9e2;
  --code-c: #8b8579;
  --code-k: #fdba74;
  --code-s: #a5d6a7;
  --code-n: #93c5fd;
  --yes: #15803d;
  --part: #a16207;
  --no: #b91c1c;
  --radius: 12px;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --max: 1120px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121110;
    --bg-2: #1a1917;
    --ink: #e7e5e4;
    --ink-2: #a8a29e;
    --ink-3: #78716c;
    --line: #2a2725;
    --accent: #fb923c;
    --accent-ink: #1c1917;
    --code-bg: #0c0b0a;
    --yes: #4ade80;
    --part: #fbbf24;
    --no: #f87171;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
  padding-inline: 20px;
}
a { color: inherit; }
code, pre { font-family: var(--mono); }
p code, li code, td code, .caption code {
  font-size: 0.88em;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.08em 0.36em;
}
h1, h2, h3 { letter-spacing: -0.02em; line-height: 1.15; margin: 0; }
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
h3 { font-size: 1.05rem; }
section { max-width: var(--max); margin: 0 auto; padding-block: 72px; }
.section-head { max-width: 640px; margin-bottom: 36px; }
.section-head p { color: var(--ink-2); margin: 12px 0 0; }

/* nav */
.nav {
  max-width: var(--max); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 22px;
}
.wordmark { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; font-size: 1.15rem; text-decoration: none; letter-spacing: -0.01em; }
.mark { width: 26px; height: 26px; border-radius: 6px; }
.nav nav { display: flex; gap: 22px; font-size: 0.95rem; }
.nav nav a { text-decoration: none; color: var(--ink-2); }
.nav nav a:hover, .nav nav a.gh { color: var(--ink); }
@media (max-width: 640px) { .nav nav a:not(.gh) { display: none; } }

/* hero */
.hero { padding-top: 48px; padding-bottom: 40px; }
.logo { width: 76px; height: 76px; border-radius: 18px; display: block; margin-bottom: 24px; }
.eyebrow { color: var(--accent); font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 18px; }
h1 { font-size: clamp(2.6rem, 6.5vw, 4.6rem); font-weight: 700; letter-spacing: -0.035em; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--ink-2); max-width: 680px; margin: 24px 0 32px; }
.lede strong { color: var(--ink); font-weight: 600; }
.install {
  display: inline-flex; align-items: center; gap: 8px; max-width: 100%;
  background: var(--code-bg); color: var(--code-ink);
  border-radius: 10px; padding: 10px 10px 10px 16px;
}
.install code { font-size: 0.92rem; overflow-x: auto; white-space: nowrap; }
.copy {
  font: 600 0.78rem var(--sans); color: var(--code-ink);
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14);
  border-radius: 7px; padding: 6px 10px; cursor: pointer; flex: none;
}
.copy:hover { background: rgba(255,255,255,0.14); }
.copy.done { color: var(--code-s); }
.fineprint { color: var(--ink-3); font-size: 0.85rem; margin: 14px 0 0; }
.cta { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.button {
  display: inline-block; text-decoration: none; font-weight: 600; font-size: 0.95rem;
  padding: 11px 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg-2);
}
.button.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.button:hover { filter: brightness(1.04); }

/* terminal */
.terminal-wrap { padding-top: 0; }
.terminal {
  background: var(--code-bg); color: var(--code-ink); border-radius: var(--radius);
  overflow: hidden; box-shadow: 0 30px 60px -30px rgba(0,0,0,0.45);
}
.terminal .bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid rgba(255,255,255,0.07); }
.terminal .bar span { width: 11px; height: 11px; border-radius: 50%; background: rgba(255,255,255,0.14); }
.terminal .bar em { margin-left: auto; font: 0.75rem var(--mono); color: var(--code-c); font-style: normal; }
.terminal pre { margin: 0; padding: 20px 22px; overflow-x: auto; font-size: 0.86rem; line-height: 1.7; }
.terminal .c { color: var(--code-c); }
.terminal .p { color: var(--accent); }
.terminal .dim { color: var(--code-c); }
.terminal .b { font-weight: 700; }
.terminal .q { color: var(--code-s); }
.terminal .ok { color: var(--code-s); }
.terminal.small { margin-top: 36px; }

/* demo */
.demo { display: grid; grid-template-columns: minmax(0, 1fr); }
.output { border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); overflow: hidden; }
.pane-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 10px 14px; font: 0.8rem var(--mono); color: var(--ink-2); border-bottom: 1px solid var(--line);
}
.tag { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); }
.code {
  margin: 0; padding: 16px 18px; font-size: 0.8rem; line-height: 1.6; overflow: auto;
  max-height: 640px; background: var(--code-bg); color: var(--code-ink); tab-size: 4;
}
.code .c { color: var(--code-c); font-style: italic; }
.code .k { color: var(--code-k); }
.code .s { color: var(--code-s); }
.code .n { color: var(--code-n); }
.code .t { color: var(--code-n); }
.tabs { display: flex; gap: 4px; padding: 8px; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tabs .input-tab { font-family: var(--mono); font-weight: 500; margin-right: auto; display: inline-flex; gap: 8px; align-items: center; }
.tabs button {
  font: 600 0.85rem var(--sans); color: var(--ink-2); background: none; border: 0;
  padding: 7px 12px; border-radius: 8px; cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--bg); color: var(--ink); box-shadow: 0 1px 0 var(--line); }
.seg { display: inline-flex; gap: 2px; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 2px; }
.seg button { font: 0.75rem var(--mono); color: var(--ink-2); background: none; border: 0; padding: 4px 9px; border-radius: 6px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.output .pane-head .copy { color: var(--ink); background: var(--bg); border-color: var(--line); }
/* the diagram is a canvas you navigate, not a box you scroll */
.diagram {
  position: relative; overflow: hidden; background: var(--bg);
  height: clamp(420px, 72vh, 780px);
  /* one finger scrolls the page; horizontal drags and pinches are ours */
  touch-action: pan-y;
  cursor: grab; user-select: none; -webkit-user-select: none;
}
.diagram.grabbing { cursor: grabbing; }
.diagram:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
/* a grid gives panning something to move against */
.diagram::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 24px 24px; opacity: 0.55;
}
.stage { position: absolute; top: 0; left: 0; transform-origin: 0 0; will-change: transform; }
.stage svg { display: block; max-width: none; height: auto; }
.diagram .error { position: absolute; inset: 0; display: grid; place-items: center; margin: 0; padding: 16px; text-align: center; color: var(--no); font: 0.8rem var(--mono); }
.diagram .hint {
  position: absolute; left: 12px; bottom: 12px; margin: 0; pointer-events: none;
  font: 0.72rem var(--mono); color: var(--ink-3);
  transition: opacity 0.4s;
}
.diagram.touched .hint { opacity: 0; }
.zoom {
  position: absolute; right: 12px; bottom: 12px; display: flex; align-items: center; gap: 2px;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 9px; padding: 3px;
  box-shadow: 0 6px 18px -10px rgba(0,0,0,0.5);
}
.zoom button {
  font: 600 0.85rem var(--sans); color: var(--ink-2); background: none; border: 0;
  min-width: 28px; height: 26px; padding: 0 7px; border-radius: 6px; cursor: pointer;
}
.zoom button:hover { background: var(--bg); color: var(--ink); }
.zoom output { font: 0.72rem var(--mono); color: var(--ink-3); min-width: 44px; text-align: center; }
@media (max-width: 600px) { .diagram .hint { display: none; } }
.caption { margin: 0; padding: 14px 16px; font-size: 0.86rem; color: var(--ink-2); border-top: 1px solid var(--line); }

/* features */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.grid article { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; background: var(--bg-2); }
.grid article p { margin: 10px 0 0; color: var(--ink-2); font-size: 0.95rem; }

/* fidelity */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; min-width: 640px; }
th, td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-2); background: var(--bg-2); }
tbody tr:last-child td { border-bottom: 0; }
td.y { color: var(--yes); font-weight: 600; }
td.p { color: var(--part); }
td.n { color: var(--ink-3); }

/* how */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 800px) { .steps { grid-template-columns: 1fr; } }
.steps li { position: relative; padding-top: 6px; }
.steps .num { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font: 700 0.85rem var(--mono); margin-bottom: 14px; }
.steps p { color: var(--ink-2); margin: 8px 0 0; font-size: 0.95rem; }

/* fit */
.fit p { max-width: 760px; color: var(--ink-2); font-size: 1.05rem; margin: 0; }

footer {
  max-width: var(--max); margin: 40px auto 0; padding: 28px 0 44px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  color: var(--ink-2); font-size: 0.9rem;
}
footer > div:first-child { display: inline-flex; align-items: center; gap: 10px; }
footer .mark { width: 18px; height: 18px; border-radius: 4px; }
footer .links { display: flex; gap: 18px; }
footer a { color: var(--ink-2); }