:root{color-scheme:dark;--bg:#101c25;--panel:#142630;--ink:#f4f7f7;--muted:#bbced2;--line:#35505c;--accent:#b1e8df}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,Segoe UI,sans-serif}a{color:var(--accent)}button{font:inherit;color:inherit;border:1px solid var(--line);background:#203741;border-radius:8px;min-height:44px;padding:8px 14px;cursor:pointer}button:hover{background:#304d59}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #fff0a6;outline-offset:3px}[hidden]{display:none!important}header,main{max-width:1250px;margin:auto}header{display:flex;align-items:center;gap:16px;padding:16px 22px}.brand img{display:block;width:120px;max-height:50px;object-fit:contain}.heading{flex:1}.heading span{font-size:12px;color:var(--muted)}h1{font-size:clamp(20px,3vw,29px);line-height:1.2;margin:3px 0}.help{white-space:nowrap}main{padding:0 22px 18px}.intro{margin:0 0 14px;color:var(--muted);font-size:15px}.intro strong{color:#fff}#workspace{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--panel)}.tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding:8px;background:#10212b}.tabs button{border:0;background:transparent;border-radius:7px;padding:10px 5px;font-weight:650}.tabs button[aria-selected=true]{background:var(--accent);color:#10242b}.panel{min-height:380px}.panel>video{width:100%;height:clamp(300px,59svh,650px);display:block;object-fit:contain;background:#0a1117}.caption{margin:0;padding:9px 16px;color:var(--muted);font-size:12px;line-height:1.5}.caption strong{color:#e4eeef}.dock{display:flex;gap:8px;align-items:center;min-height:64px;padding:9px 12px;border-top:1px solid var(--line)}.dock>span{flex:1;font-size:12px;color:var(--muted)}.dock button{font-size:13px}.tower-display{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:16px;padding:18px;align-items:center}.tower-display>img{height:clamp(320px,58svh,650px);width:100%;object-fit:contain}.tower-display video{display:block;width:100%;max-height:440px;background:#0a1117}.source-frame{height:clamp(320px,59svh,650px);overflow:hidden;display:flex;justify-content:center;touch-action:pan-y;cursor:zoom-in;background:#e3e6e6}.source-frame.zoomed{touch-action:none;cursor:grab}.source-frame img{width:100%;height:100%;object-fit:contain;user-select:none}.source-controls{display:flex;align-items:center;justify-content:center;gap:10px;padding:8px}.source-controls span{min-width:45px;text-align:center;font-size:13px}.source-controls button{font-size:13px}.choice-panel{padding:22px}.choice-panel h2{font-size:25px;margin:0 0 5px}.choice-panel>p{color:var(--muted);font-size:14px;margin-top:0}.choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:20px 0}.choices article{border:1px solid #4c6772;border-radius:10px;padding:18px;background:#10212b}.choice-letter{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:var(--accent);color:#10212b;font-weight:bold}.choices h3{font-size:19px;line-height:1.3;margin:12px 0}.choices p{font-size:14px;color:var(--muted);margin-bottom:0}.next-step{border-top:1px solid var(--line);padding-top:12px;margin-top:16px}.proposal{border-left:3px solid var(--accent);padding:8px 14px;background:#1b3540}.proposal p{font-size:13px;color:var(--muted);margin:4px 0}.choice-note{padding-top:14px;font-size:12px!important}.info-panel{padding:20px;margin-top:14px;background:#162c36;border:1px solid var(--line);border-radius:12px}.info-panel h2{font-size:20px;margin:0 0 10px}.info-panel p{font-size:14px;color:var(--muted)}.info-heading{display:flex;justify-content:space-between;align-items:center}.detail-links{display:flex;gap:12px;flex-wrap:wrap}.detail-links a{display:inline-flex;align-items:center;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:8px;font-size:13px}.small{font-size:12px!important}footer{padding:15px 0 0;font-size:11px;color:#a8bec4}.recovery{padding:12px;color:#fff0a6}.recovery button{margin:0 8px}.expanded{position:fixed!important;inset:0;z-index:50;border-radius:0!important;display:flex;flex-direction:column;overflow:auto}.expanded .panel:not([hidden]){flex:1;min-height:0}.expanded .panel>video,.expanded .source-frame{height:calc(100svh - 168px)}body.expanding{overflow:hidden}#tip{position:fixed;max-width:290px;padding:9px 12px;border:1px solid #d5e5e4;background:#ecf5f3;color:#152b31;border-radius:8px;font-size:12px;z-index:100;pointer-events:none;box-shadow:0 6px 20px #0007}@media(max-width:650px){header{padding:12px;gap:10px}.brand img{width:74px;max-height:40px}.heading span{font-size:10px}.help{padding:8px 10px;font-size:12px}main{padding:0 10px 12px}.intro{font-size:13px;margin-bottom:10px}.tabs{padding:5px;gap:2px}.tabs button{font-size:12px;padding:10px 3px}.panel{min-height:330px}.panel>video{height:clamp(270px,54svh,510px)}.dock{gap:6px}.dock>span{font-size:10px;line-height:1.35;max-width:140px}.dock button{font-size:12px;padding:8px 10px}.caption{padding:9px 12px;font-size:11px}.tower-display{grid-template-columns:1fr;gap:10px;padding:10px}.tower-display>img{height:290px}.tower-display video{max-height:320px}.choices{grid-template-columns:1fr;margin:16px 0}.choice-panel{padding:16px}.choice-panel h2{font-size:21px}.choices article{padding:14px}.choices h3{font-size:17px;margin:8px 0}.info-panel{padding:15px}.source-controls{gap:6px}.source-controls button{padding:8px 11px}.expanded .panel>video{height:calc(100svh - 188px)}}