:root{color-scheme:dark;font:16px/1.6 system-ui,sans-serif;--bg:#061018;--panel:#0d1c28;--line:#233b4c;--muted:#a5bbcb;--cyan:#37dbdc}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#eef6fc}button,input,a{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;background:#142a3a;border:1px solid var(--line);color:inherit;border-radius:10px;padding:10px 15px}button:hover{background:#203d50}a{color:var(--cyan)}:focus-visible{outline:3px solid #ffcf4a;outline-offset:3px}[hidden]{display:none!important}.topbar{height:76px;display:flex;align-items:center;gap:20px;padding:0 28px;border-bottom:1px solid var(--line);background:#08141e;position:sticky;top:0;z-index:4}.brand{text-decoration:none;font-size:24px;font-weight:850;letter-spacing:.03em}.brand span{display:block;font-size:8px;letter-spacing:.16em;color:#c3d8e7}.guide-label{color:var(--muted);flex:1}.shell{display:grid;grid-template-columns:300px minmax(0,1fr)}aside{border-right:1px solid var(--line);height:calc(100dvh - 76px);position:sticky;top:76px;overflow:auto;background:#0a1721}.sidebar-inner{padding:26px 20px}label{font-weight:650;font-size:14px}.search-wrap{display:flex;position:relative;margin-top:12px}input{width:100%;min-width:0;background:#061018;border:1px solid #365265;color:inherit;padding:12px;border-radius:10px;font-size:14px}.search-wrap button{position:absolute;right:3px;top:3px;padding:6px;background:transparent}.small{font-size:12px;color:var(--muted);min-height:18px}nav details{margin:18px 0}nav summary{cursor:pointer;font-size:12px;text-transform:uppercase;letter-spacing:.065em;color:var(--muted);padding:5px 0}nav a{display:block;text-decoration:none;color:#c9dae6;border-radius:9px;padding:10px 12px;font-size:14px;line-height:1.5;margin:4px 0}nav a:hover{background:#112b3a}nav a[aria-current]{background:#163747;color:#62f0ed;box-shadow:inset 3px 0 var(--cyan)}.sidebar-foot{font-size:12px;color:#728e9f;border-top:1px solid var(--line);padding-top:20px;margin-top:36px}main{padding:38px 48px 60px;min-width:0;max-width:1300px;width:100%;margin:auto}.crumbs{font-size:13px;color:var(--muted);margin-bottom:24px}.eyebrow{color:var(--cyan);text-transform:uppercase;font-size:12px;font-weight:750;letter-spacing:.13em}h1{font-size:clamp(28px,3vw,40px);line-height:1.18;letter-spacing:-.025em;margin:10px 0 16px}h2{font-size:24px;line-height:1.3;margin:10px 0 18px}p{color:#bfd0dc}.intro{font-size:18px;max-width:650px}.before{font-size:14px;padding:14px 18px;background:#0e2533;border-radius:10px}.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:28px 0 18px}.toolbar .counter{margin-right:auto;color:var(--muted);font-size:13px}.toolbar button{font-size:13px}.toolbar button[aria-pressed=true]{border-color:var(--cyan);color:var(--cyan)}.step-layout{display:grid;grid-template-columns:minmax(220px,.9fr) minmax(260px,1.1fr);gap:32px;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:28px}.instruction{font-size:18px;line-height:1.7}.result{border-left:3px solid var(--cyan);padding:8px 0 8px 16px;margin:28px 0;color:#b9cfdb}.result strong{display:block;color:#e6f7fc;font-size:13px;margin-bottom:6px}.screen{position:relative;display:block;max-width:470px;margin:auto}.screen img{display:block;width:100%;border-radius:12px;border:1px solid #2a4252}.annotation{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.annotation rect{fill:none;stroke:#ffcf4a;stroke-width:3;filter:drop-shadow(0 1px 2px #000)}figure{margin:0}figcaption{font-size:12px;color:var(--muted);margin-top:12px;text-align:center}.pager{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:24px}.primary{background:linear-gradient(110deg,#398aec,#2bced1);color:#031623;font-weight:750;border:none}.primary:hover{background:#52dcdf}.dots{display:flex;gap:8px}.dots button{padding:0;width:10px;height:10px;border-radius:50%;background:#385466;border:none}.dots button[aria-current]{background:var(--cyan)}.topics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:30px}.topic{display:block;padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:16px;color:inherit;text-decoration:none}.topic:hover{border-color:#2a9da9;background:#102935}.topic strong{display:block;font-size:18px;margin:8px 0}.topic p{font-size:14px;margin-bottom:0}.scope{margin-top:34px;font-size:13px;color:#8fa9bb}body.nav-closed .shell{grid-template-columns:1fr}body.nav-closed #sidebar{display:none}.text-only .step-layout{grid-template-columns:1fr}.text-only figure{display:none}.skip{position:fixed;top:-80px;left:20px;z-index:10;background:#fff;color:#000;padding:12px}.skip:focus{top:10px}@media(max-width:1050px){main{padding:28px}.step-layout{grid-template-columns:1fr}.screen{max-width:420px}}@media(max-width:760px){.shell{grid-template-columns:1fr}.topbar{padding:0 16px;gap:12px}.guide-label{font-size:12px}.topbar #home{display:none}aside{position:fixed;top:76px;left:0;width:min(320px,90vw);height:calc(100dvh - 76px);z-index:3;box-shadow:15px 0 35px #0008}main{padding:26px 18px}.topics{grid-template-columns:1fr}.step-layout{padding:20px}.pager{flex-wrap:wrap}.dots{order:3;justify-content:center;width:100%}}@media print{.topbar,aside,.toolbar,.pager{display:none}.shell{display:block}main{padding:0}.step-layout{break-inside:avoid}}

.brand{display:flex;align-items:center;flex-shrink:0}.brand img{width:68px;height:68px;object-fit:contain;display:block}.step-layout{margin-bottom:28px;scroll-margin-top:100px}.section-end{border-top:1px solid var(--line);padding-top:24px;font-size:14px}
/* Optional gesture layer: no camera before explicit choice. */
#gesture-intro{max-width:580px;width:calc(100% - 32px);max-height:85dvh;overflow:auto;background:#0b1d2a;color:#edf8ff;border:1px solid #2b7888;border-radius:22px;padding:28px}#gesture-intro::backdrop{background:#020912d9}#gesture-intro li{margin:12px 0;color:#c9dce9}#gesture-intro h2{font-size:30px}.gesture-privacy{font-size:14px;padding:12px;border-left:3px solid var(--cyan);background:#102c3a}.gesture-choices{display:flex;gap:12px;flex-wrap:wrap}.gesture-status{font-size:12px;padding:9px 18px;margin:0;background:#0c2330;border-top:1px solid #284655;color:#bfd4df}#gesture-preview{position:fixed;top:auto;bottom:18px;right:18px;left:auto;z-index:8;width:260px;max-width:calc(100vw - 24px);height:auto;border:1px solid #3d7a8b;border-radius:14px;background:#071722;box-shadow:0 8px 30px #0008;overflow:hidden}#gesture-preview.left{right:auto;left:12px}.camera-title{font-size:12px;padding:8px;color:#69ebdc}#gesture-video{width:100%;display:block;transform:scaleX(-1)}#gesture-preview.compact video{display:none}.camera-controls{display:flex;flex-wrap:wrap;gap:4px;padding:8px}.camera-controls button{font-size:12px;padding:8px;min-height:40px}#hand-cursor{position:fixed;z-index:20;pointer-events:none;width:26px;height:26px;border:3px solid #46f4f0;border-radius:50%;transform:translate(-50%,-50%);background:#26c8d633;box-shadow:0 0 0 3px #00131a}#hand-cursor.pinching{background:#4bf0e5}.topbar #gesture-open,.topbar #gesture-stop{font-size:13px}@media(max-width:760px){.guide-label{display:none}.topbar{gap:8px}.topbar #gesture-open,.topbar #gesture-stop{padding:8px;font-size:12px}#gesture-preview{width:210px}#gesture-intro{padding:20px}}
.gesture-status{position:fixed;bottom:0;left:0;right:0;z-index:6;pointer-events:none}body{padding-bottom:48px}#gesture-preview{bottom:60px}