:root{--navy:#172d45;--text:#24394e;--muted:#627385;--line:#dce3e9;--soft:#f5f7f9;--lime:#b7d850;--danger:#b63d3d;--radius:10px}
*{box-sizing:border-box}body{margin:0;background:#fff;color:var(--text);font:16px/1.65 system-ui,"Microsoft YaHei","PingFang SC",sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}a{color:#254f73;text-underline-offset:3px}button,.button{cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--navy);padding:10px 17px;min-height:44px;border-radius:8px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}button:hover,.button:hover{background:var(--soft)}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:var(--navy);color:#fff;border-color:var(--navy)}.primary:hover{background:#29455e}.danger{color:var(--danger)}.small{font-size:13px}.muted{color:var(--muted)}.hidden,[hidden]{display:none!important}header{border-bottom:1px solid var(--line);background:#fff}.top{max-width:1240px;margin:auto;padding:18px 28px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-size:18px;font-weight:700;text-decoration:none;color:var(--navy)}.brand:before{content:"";display:inline-block;width:8px;height:8px;background:var(--lime);margin-right:10px}.top nav{display:flex;gap:16px;align-items:center;font-size:14px}.top nav a{text-decoration:none}.wrap{max-width:1200px;padding:32px 28px 85px;margin:auto}h1{font-size:30px;line-height:1.4;margin:0 0 10px}h2{font-size:21px;margin:0 0 15px}h3{font-size:17px;margin:0 0 9px}p{margin:10px 0}.intro{margin:16px 0 30px;max-width:780px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.panel,.task-card{border:1px solid var(--line);border-radius:var(--radius);padding:23px;background:#fff}.panel{margin:18px 0}.task-card{display:flex;flex-direction:column;gap:12px}.task-card p{color:var(--muted);font-size:14px;flex:1}.task-card .number{font-size:12px;color:#718394;letter-spacing:1px}.task-card.shoulder{border-top:4px solid var(--lime)}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.spread{justify-content:space-between}.columns{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,1fr);gap:24px}.stack{display:grid;gap:15px}.field{display:grid;gap:6px;font-size:14px}.field input,.field select,.field textarea{width:100%;min-height:46px;border:1px solid #bfcbd5;border-radius:7px;padding:10px 12px;color:var(--navy);background:#fff}.field textarea{min-height:80px;resize:vertical}.check{display:flex;gap:10px;align-items:flex-start;font-size:14px}.check input{margin-top:6px;min-width:18px;min-height:18px}.notice{padding:14px 17px;background:var(--soft);border-left:3px solid var(--lime);font-size:14px;line-height:1.7;margin:14px 0}.error{color:var(--danger);font-size:14px;white-space:pre-wrap}.status{color:var(--muted);font-size:14px}.tag{font-size:12px;background:var(--soft);border:1px solid var(--line);border-radius:5px;padding:3px 8px;display:inline-block}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px}th,td{padding:13px 10px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--soft);font-weight:600}tr:last-child td{border-bottom:0}.empty{padding:30px;text-align:center;color:var(--muted)}.save-status{position:fixed;bottom:10px;right:12px;font-size:12px;color:#40576d;background:#fff;border:1px solid var(--line);padding:6px 12px;border-radius:6px;z-index:9998;max-width:min(90vw,450px)}.login{max-width:500px;margin:38px auto;padding:28px;border:1px solid var(--line);border-radius:12px}.auth-switch{border:0;padding:5px 0;text-decoration:underline;min-height:40px}footer{font-size:12px;color:var(--muted);padding:24px 28px;text-align:center;border-top:1px solid var(--line)}.video-stage{position:relative;background:#152230;aspect-ratio:4/3;border-radius:8px;overflow:hidden}.video-stage video,.video-stage canvas{position:absolute;width:100%;height:100%;object-fit:contain;inset:0}.video-stage canvas{pointer-events:none}.video-stage.mirrored video,.video-stage.mirrored canvas{transform:scaleX(-1)}.video-stage .empty{position:absolute;inset:35% 15% auto;color:#d4dfe8;font-size:14px}.metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{padding:16px;border:1px solid var(--line);border-radius:8px}.metric strong{display:block;font-size:25px;font-weight:600}.metric span{color:var(--muted);font-size:12px}.curve{width:100%;height:180px;display:block;cursor:crosshair;border-bottom:1px solid var(--line)}.step-list{padding-left:22px;font-size:14px}.step-list li{margin:8px 0}progress{width:100%;height:12px;accent-color:var(--navy)}dialog{border:1px solid var(--line);border-radius:12px;padding:25px;max-width:600px;width:90%}dialog::backdrop{background:#15223080}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #7a9f20;outline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(max-width:800px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.columns{grid-template-columns:1fr}.top{padding:14px 18px;flex-wrap:wrap}.top nav{gap:12px}.wrap{padding:25px 18px 70px}h1{font-size:25px}.panel,.task-card{padding:18px}.login{margin:25px 16px}.metric-grid{gap:8px}.metric{padding:10px}.metric strong{font-size:22px}th,td{padding:10px 7px}}
@media(max-width:480px){.grid{grid-template-columns:1fr}.top nav{font-size:12px}.brand{font-size:16px}.top nav button{font-size:12px;padding:6px 10px;min-height:40px}.row.controls>*{flex:1}.metric-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.video-stage{aspect-ratio:3/4}}
@media print{header nav,button,.controls,.save-status,.no-print,footer{display:none!important}.wrap{max-width:none;padding:0}.columns{display:block}.panel{break-inside:avoid}body{font-size:12px}.table-wrap{overflow:visible}.curve{height:160px}}

@media(max-width:600px){.controls>button,.controls>.button{flex:1 1 42%;min-width:120px}.video-stage{aspect-ratio:4/3!important}.video-stage[style]{aspect-ratio:auto!important;height:auto;min-height:260px}.video-stage[style] video{position:relative;display:block;width:100%;height:auto;min-height:260px}.video-stage[style] canvas{height:100%}}