:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#172b36;background:#f3f6f7;font-synthesis:none;--accent:#087c77;--sjs-primary-backcolor:#087c77;--sjs-font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif}*{box-sizing:border-box}body{margin:0}header{height:76px;border-bottom:1px solid #dce5e7;display:flex;align-items:center;justify-content:space-between;max-width:1040px;margin:auto;padding:0 24px}header a{font-size:20px;font-weight:750;text-decoration:none;color:#153e43}header a span{font-size:12px;font-weight:400;margin-left:16px;color:#647780}.badge{border:1px solid #bed8d5;background:#e4f2ef;color:#15615b;padding:6px 11px;border-radius:30px;font-size:12px}main{max-width:900px;padding:44px 24px 20px;margin:auto}.eyebrow{font-size:12px;letter-spacing:2px;color:#487c7b;font-weight:700}h1{font-size:38px;letter-spacing:-1.3px;margin:14px 0}p{line-height:1.8}.intro{color:#576c76;max-width:680px}.brief{background:#e7eeef;border-left:3px solid #267e7b;padding:18px 22px;margin:26px 0 34px;border-radius:0 12px 12px 0}.brief strong{font-size:22px;font-weight:800;color:#214f50}.brief p{margin:10px 0 0;font-size:19px;font-weight:700;line-height:1.85}.viewer{background:white;padding:25px;border:1px solid #e1e8eb;border-radius:18px;box-shadow:0 6px 30px #12323606}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.section-heading h2{margin:0;color:#718f96;font-size:15px;font-weight:500}.section-heading h2 span{color:#17363b;margin-left:12px;font-size:20px;font-weight:650}.section-heading>a{font-size:13px;color:#087c77;white-space:nowrap}#watched{font-size:12px;color:#647a80}.hint{font-size:14px;color:#647780;line-height:1.8}#tabs{display:grid;grid-template-columns:repeat(6,1fr);gap:9px;scroll-margin-top:18px;margin:19px 0 14px}button{font:inherit;cursor:pointer}#tabs button{height:47px;border:1px solid #dce4e6;background:#fff;color:#45606a;border-radius:9px;font-weight:700}#tabs button[aria-selected=true]{background:#087c77;color:#fff;border-color:#087c77}#tabs button small{font-size:11px;margin-left:5px}.screen{position:relative;background:#111c23;border-radius:12px;overflow:hidden;display:flex;align-items:center;justify-content:center;aspect-ratio:16/10}video{width:100%;height:100%;max-height:480px;object-fit:contain;display:block}#current-label{position:absolute;top:12px;left:12px;padding:5px 9px;border-radius:5px;background:#122632b3;color:white;font-size:12px;pointer-events:none;z-index:1}.player-footer{display:flex;align-items:center;justify-content:space-between;margin-top:15px;font-size:12px;color:#647780;gap:12px}.secondary{padding:9px 13px;border:1px solid #d6e1e4;background:white;border-radius:8px;color:#285354}.ranking-section{margin-top:38px}#survey{margin-top:18px;--sjs-general-backcolor:transparent;--sjs-general-backcolor-dim:transparent;--sjs-corner-radius:12px}#survey .sd-root-modern{background:transparent}#survey .sd-body.sd-body--static{max-width:none;padding:0}#survey .sd-body__page{margin:0}#survey .sd-page{padding:0}#survey .sd-question{box-shadow:none;border:1px solid #dfe6e9}#survey .sd-ranking-item{touch-action:pan-y}.confirmation{display:flex;gap:12px;font-size:14px;line-height:1.7;align-items:flex-start;margin:22px 0}.confirmation input{width:21px;height:21px;flex:none;accent-color:#087c77}.primary{width:100%;padding:17px;border:0;border-radius:11px;background:#087c77;color:white;font-weight:650;min-height:52px}.primary:disabled{background:#bfd1d2;color:#f9ffff;cursor:default}#save-status{font-size:14px;white-space:pre-line}#video-error{background:#fff0ed;color:#9c3d27;padding:14px;border-radius:8px;margin-top:12px;font-size:14px}.diagnostics{margin-top:30px;padding:18px;border:1px solid #dfe6e9;border-radius:10px;color:#657981;font-size:13px}.diagnostics summary{cursor:pointer}.diagnostics pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px;line-height:1.7}footer{font-size:12px;color:#7d9097;text-align:center;line-height:1.8;margin:36px 0 15px}button:focus-visible,a:focus-visible{outline:3px solid #d49d30;outline-offset:3px}@media(max-width:600px){header{height:63px;padding:0 17px}header a{font-size:18px}header a span{display:none}main{padding:28px 16px 15px}h1{font-size:29px}.intro{font-size:14px}.brief{padding:15px 16px;margin-top:20px}.brief p{font-size:18px}.viewer{padding:17px 13px;border-radius:14px}.section-heading h2 span{font-size:17px;margin-left:8px}#watched{font-size:11px}#tabs{gap:6px}#tabs button{height:46px}.screen{aspect-ratio:1.35}#survey .sd-question{padding-left:16px;padding-right:16px}#survey .sd-question__title{font-size:17px}.player-footer{font-size:11px}.ranking-section{margin-top:28px}}
.reference{margin:0 0 28px;background:#fff;border:1px solid #e1e8eb;border-radius:14px;padding:16px}.reference figcaption{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px;font-size:14px}.reference figcaption span{font-size:12px;color:#647780}.reference img{display:block;width:100%;height:auto;max-height:280px;object-fit:contain;border-radius:8px}.rank-card{background:white;border:1px solid #dfe6e9;border-radius:14px;padding:22px;margin-bottom:18px}.rank-card h3{font-size:24px;font-weight:800;line-height:1.5;margin:0;overflow-wrap:anywhere}.rank-card .hint{margin:10px 0 16px}.rank-progress{font-weight:650;color:#087c77;font-size:15px;margin:12px 0}.rank-choices{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:9px}.rank-choices button{min-height:72px;border:1px solid #b7d3d0;background:#f5fbfa;border-radius:10px;color:#215958;touch-action:manipulation}.rank-choices strong{display:block;font-size:21px}.rank-choices small{display:block;font-size:12px;margin-top:5px}.rank-choices button.chosen{background:#e5eeee;color:#617a79;border-color:#d7e3e1;cursor:default}.rank-order{min-height:26px;font-size:14px;overflow-wrap:anywhere;color:#3f6064}.rank-actions{display:flex;gap:10px}.rank-actions button{min-height:44px;touch-action:manipulation}.rank-actions button:disabled{opacity:.45;cursor:default}@media(max-width:600px){.rank-card{padding:17px 14px}.rank-card h3{font-size:22px}.rank-choices{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.reference{padding:12px}.rank-order{font-size:13px}}
.rank-choices button.chosen{cursor:pointer;background:#087c77;color:#fff;border-color:#087c77}.rank-choices button:disabled{cursor:default}.rank-choices small{font-size:11px}
[hidden]{display:none!important}.scene-navigation{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:20px 0;font-size:14px}.scene-navigation select{font:inherit;max-width:100%;min-height:44px;padding:8px;border:1px solid #b7d3d0;border-radius:8px;background:white;color:#17363b}.scene-navigation span{color:#487c7b}.page-actions{display:flex;gap:12px;margin-top:20px}.page-actions button{flex:1;min-height:52px}.page-actions .primary{width:auto}#final-submit{border-top:1px solid #dce5e7;margin-top:24px;padding-top:8px}#completion{padding:32px 0}#receipt{overflow-wrap:anywhere;color:#487c7b}
/* Keep the same player and A–F controls visible while ranking. */
.study{position:relative}.viewer{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;padding:10px 12px;background:#fff;box-shadow:0 5px 20px #1232361a;border-radius:12px;margin-bottom:22px}.viewer #tabs{margin:0 0 8px;gap:8px;scroll-margin-top:12px}.viewer #tabs button{height:44px}.viewer .screen{height:min(30vh,300px);height:min(30svh,300px);aspect-ratio:auto;border-radius:8px}.viewer video{width:100%;height:100%;max-height:none}.viewer .player-footer{margin-top:6px;min-height:20px;font-size:11px;gap:6px}.viewer #watched{font-size:11px;white-space:nowrap}.ranking-section{margin-top:0}.ranking-section .section-heading h2 span{margin-left:0}.rank-card{scroll-margin-top:calc(var(--viewer-height,320px) + 16px)}.reference{margin-top:26px;margin-bottom:16px}.brief{margin-top:0}.screen #still-frame{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;pointer-events:none}.screen [hidden]{display:none!important}#toggle-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;border:0;background:transparent;touch-action:manipulation;padding:0;color:#fff}#toggle-play .play-icon{width:48px;height:48px;pointer-events:none}#toggle-play.is-playing .play-icon{opacity:0}#toggle-play:focus-visible{outline-offset:-4px}#fullscreen{position:absolute;bottom:8px;right:8px;z-index:3;width:44px;height:44px;border:0;border-radius:8px;background:#122632a6;color:white;display:grid;place-items:center;touch-action:manipulation}#fullscreen svg{width:23px;height:23px}.screen:fullscreen{width:100vw!important;height:100vh!important;max-height:none;background:#111c23}.screen:fullscreen video{max-height:none}@media(max-width:600px){.viewer{padding:8px;margin-bottom:20px}.viewer #tabs{gap:5px}.viewer .player-footer{font-size:10px}.viewer #watched{font-size:10px}.rank-card .hint{line-height:1.65}.screen #current-label{top:8px;left:8px}}@media(orientation:landscape) and (max-height:500px){.study{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}.viewer .screen{height:calc(100svh - 110px)}.rank-card{scroll-margin-top:16px}.viewer{margin:0}.ranking-section{min-width:0}}