:root {
  --bg: #ffffff; --panel: #f6f6f6; --fg: #1a1a1a; --mut: #4d4d4d; --line: #d2d2d2; --accent: #1f5c99; --cyan: #00a8c0;
  --f-body: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
  --f-head: var(--f-body);
  --f-mono: ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161616; --panel: #1f1f1f; --fg: #e8e8e8; --mut: #ababab; --line: #3a3a3a; --accent: #8fb8e4; --cyan: #00e5ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 var(--f-body); }
main { max-width: 980px; margin: 0 auto; padding: 28px 16px 72px; }
h1, h2 { font-family: var(--f-head); font-weight: 600; }
h1 { font-size: clamp(1.6rem, 4.5vw, 2.3rem); line-height: 1.15; margin: 0 0 10px; letter-spacing: -0.01em; }
h2 { font-size: 1.3rem; margin: 30px 0 10px; }
h3 { font-size: 1.05rem; margin: 0 0 4px; }
p { margin: 0 0 10px; max-width: 70ch; }
a { color: var(--accent); }
.back { font-size: 15px; display: inline-block; margin-bottom: 12px; }
.note { color: var(--mut); font-size: 15px; }
.stage { position: relative; width: 100%; height: clamp(300px, 64vh, 640px); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; background: var(--panel); touch-action: none; }
.stage canvas { width: 100%; height: 100%; display: block; }
.tip { position: absolute; pointer-events: none; padding: 3px 9px; border-radius: 6px; background: rgba(0,0,0,.75); color: #fff; font-size: 14px; white-space: nowrap; transform: translate(12px, 12px); display: none; }
.hud { position: absolute; left: 10px; bottom: 8px; right: 10px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; font-size: 14px; color: #fff; text-shadow: 0 1px 3px rgba(0,0,0,.8); pointer-events: none; }
.bar { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; align-items: center; }
button { font: inherit; font-size: 15px; padding: 6px 16px; border-radius: 4px; border: 1px solid var(--line); background: var(--panel); color: var(--fg); cursor: pointer; }
.steps { display: grid; gap: 22px; }
.step { border-top: 1px solid var(--line); padding-top: 14px; }
.clips { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 10px; }
figure { margin: 0; flex: 1 1 280px; max-width: 460px; }
.lb { display: flex; font-size: 14px; color: var(--mut); }
.lb span { flex: 1; text-align: center; }
video { width: 100%; display: block; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); }
figcaption { font-size: 14px; color: var(--mut); }
table { border-collapse: collapse; font-size: 15px; }
td, th { padding: 4px 14px 4px 0; text-align: left; border-bottom: 1px solid var(--line); }
td.n { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }
.list { columns: 2 220px; margin: 10px 0 0; padding-left: 18px; }
.err { color: #b3261e; }
/* scenes and object pages (relsite1022) */
.topbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.navs { display: flex; gap: 8px; flex-wrap: wrap; }
a.btn { display: inline-block; padding: 6px 16px; border-radius: 4px; border: 1px solid var(--line); background: var(--panel); color: var(--fg); text-decoration: none; font-size: 15px; font-weight: 600; }
a.btn.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.tiles { list-style: none; margin: 18px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
a.tile { display: block; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); color: var(--fg); text-decoration: none; padding: 6px; min-width: 0; }
a.tile img { display: block; width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 2px; background: #000; }
a.tile b { display: block; font-size: 14px; line-height: 1.3; margin-top: 5px; }
.clips.one figure { max-width: 320px; }
.clips.push { display: grid; grid-template-columns: repeat(auto-fill, minmax(440px, 1fr)); gap: 22px; }
.clips.push.three { grid-template-columns: 1fr; }
.clips.push figure { max-width: none; }
.gt { margin: 18px 0 6px; color: var(--mut); }
@media (max-width: 720px) { .clips.push, .clips.push.three { grid-template-columns: 1fr; } .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.dots { display: flex; align-items: center; gap: 4px; margin: 0 0 10px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); border: 1.5px solid var(--accent); }
.dots i.h { background: transparent; }
.dots small { margin-left: 8px; font-size: 14px; color: var(--mut); }
figure.scan { max-width: none; margin: 4px 0 18px; display: flex; flex-direction: column; align-items: center; gap: 6px; }
figure.scan .lb { justify-content: center; width: 100%; }
figure.scan .lb span { flex: none; font-weight: 600; }
figure.scan video { display: block; width: auto; max-width: 100%; max-height: 300px; margin: 0 auto; border-radius: 4px; }
.stepvideo { margin: 10px 0 0; }
.stepvideo video { display: block; width: 100%; max-width: 760px; border-radius: 4px; background: #101418; }
.more { margin: 14px 0 6px; }
#intro:empty { display: none; }