/* Layout: a working tool first (stage + frame rack), then two short reference bands. */
:root {
  --bg: #f1f2ef;
  --surface: #ffffff;
  --stage: #e1e5e2;
  --ink: #15181a;
  --muted: #5a6267;
  --line: #d4d9d6;
  --accent: #0d6870;
  --accent-ink: #ffffff;
  --warn: #9a4a12;
  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1214; --surface: #161a1d; --stage: #1b2124; --ink: #e7ebe9; --muted: #97a1a6;
    --line: #283034; --accent: #5fc3c7; --accent-ink: #0a1213; --warn: #f0a46a; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.55 var(--font-body); }
[hidden] { display: none !important; }
a { color: inherit; }
.top-in, .tool, .sizes-in, .privacy-in, .foot-in {
  max-width: 1240px; margin: 0 auto;
  padding-left: max(18px, env(safe-area-inset-left, 0px)); padding-right: max(18px, env(safe-area-inset-right, 0px));
}

.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); padding-top: env(safe-area-inset-top, 0px); }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 58px; }
.mark { font: 700 20px/1 var(--font-display); text-decoration: none; letter-spacing: -0.01em; }
.mark span { font: 500 11px/1 var(--font-mono); letter-spacing: 0.1em; color: var(--accent); margin-left: 6px; vertical-align: 3px; }
nav { display: flex; gap: 20px; font-size: 14px; }
nav a { text-decoration: none; color: var(--muted); }
nav a:hover { color: var(--ink); }
@media (max-width: 560px) { nav a:not(:first-child) { display: none; } }

.tool { padding-block: 34px 56px; display: grid; gap: 26px; }
.intro { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 12px 40px; align-items: end; }
@media (max-width: 900px) { .intro { grid-template-columns: minmax(0, 1fr); } }
h1 { font: 700 clamp(32px, 5.2vw, 58px)/0.98 var(--font-display); letter-spacing: -0.025em; margin: 0; text-wrap: balance; }
.intro p { margin: 0; color: var(--muted); max-width: 52ch; }

.grid { display: grid; grid-template-columns: minmax(0, 1fr) 350px; gap: 26px; align-items: start; }
@media (max-width: 900px) { .grid { grid-template-columns: minmax(0, 1fr); } }
.stage-col { display: grid; gap: 14px; min-width: 0; }
.stage { position: relative; aspect-ratio: 4 / 3; background: var(--stage); border-radius: 8px; overflow: hidden; touch-action: none; }
@media (max-width: 560px) { .stage { aspect-ratio: 3 / 4; } }
.stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.stage video { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.status { position: absolute; left: 12px; top: 12px; right: 12px; pointer-events: none; display: flex; }
.status span { background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 6px 13px; font-size: 13px; max-width: 100%; }
.status span.err { color: var(--warn); }
.mode-tag { position: absolute; right: 12px; bottom: 12px; font: 500 11px/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); background: color-mix(in srgb, var(--stage) 80%, transparent); padding: 5px 7px; border-radius: 4px; pointer-events: none; }

.toolbar { display: flex; flex-wrap: wrap; gap: 8px; }
.btn, .filters button, .list button { font-family: inherit; color: inherit; }
.btn { font-size: 14px; font-weight: 500; line-height: 1; border-radius: 999px; padding: 12px 17px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; display: inline-flex; align-items: center; position: relative; }
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
:focus-visible, .btn:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }

.adjust { display: flex; flex-wrap: wrap; gap: 10px 26px; padding: 12px 15px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.adjust label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); min-width: 180px; flex: 1; }
.adjust input { width: 100%; accent-color: var(--accent); }

.detail { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 10px 24px; border-top: 1px solid var(--line); padding-top: 15px; }
.detail > div:first-child { min-width: 0; }
.detail h2 { font: 500 27px/1.1 var(--font-display); margin: 0; text-wrap: balance; }
.meta { margin: 4px 0 0; color: var(--muted); }
.size .num { font: 400 23px/1.2 var(--font-mono); font-variant-numeric: tabular-nums; }
.size .cap { font: 500 10.5px/1.3 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

.rack { display: grid; gap: 12px; min-width: 0; }
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.filters button { font-size: 13px; padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; }
.filters button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
@media (max-width: 900px) { .list { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); column-gap: 18px; } }
.list button { width: 100%; border: 0; border-bottom: 1px solid var(--line); background: transparent; padding: 13px 6px 13px 14px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 12px; text-align: left; line-height: 1.3; cursor: pointer; position: relative; }
.list button:hover, .list button[aria-current="true"] { background: var(--surface); }
.list button[aria-current="true"]::before { content: ""; position: absolute; left: 0; top: 11px; bottom: 11px; width: 3px; border-radius: 2px; background: var(--accent); }
.list .n { font-weight: 600; }
.list .r { grid-column: 1; font: 12px/1.3 var(--font-mono); color: var(--muted); }
.list .s { grid-row: 1 / span 2; grid-column: 2; align-self: center; font: 12px/1 var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; }

.sizes { background: var(--surface); border-block: 1px solid var(--line); }
.sizes-in { padding-block: 52px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px 56px; align-items: center; }
@media (max-width: 900px) { .sizes-in { grid-template-columns: minmax(0, 1fr); } }
.sizes h2, .privacy h2 { font: 700 30px/1.08 var(--font-display); letter-spacing: -0.015em; margin: 0 0 12px; text-wrap: balance; }
.sizes p, .privacy p { margin: 0 0 14px; max-width: 60ch; color: var(--muted); }
dl { margin: 18px 0 0; display: grid; gap: 10px; }
dl div { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 14px; align-items: baseline; }
dt { font: 500 20px/1 var(--font-mono); color: var(--accent); }
dd { margin: 0; }
.diagram { margin: 0; color: var(--ink); }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .dim { stroke: var(--accent); }
.diagram .dimtext { font: 12px var(--font-mono); fill: var(--muted); }
.diagram figcaption { margin-top: 8px; font-size: 13px; color: var(--muted); }

.privacy-in { padding-block: 52px; }
.privacy .fine { font-size: 13px; }
.foot { border-top: 1px solid var(--line); }
.foot-in { padding-block: 22px calc(22px + env(safe-area-inset-bottom, 0px)); font: 12px var(--font-mono); color: var(--muted); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }