:root{color-scheme:light;--navy:#172b46;--blue:#315c91;--muted:#61738b;--line:#dbe2ea;--paper:#fff;--bg:#edf1f5;--accent:#d9e8f5}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--navy);font:16px/1.55 Arial,Helvetica,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}a{color:inherit}.topbar{height:66px;padding:0 clamp(16px,3vw,42px);display:flex;align-items:center;gap:20px;background:#fff;border-bottom:1px solid var(--line)}.topbar a{text-decoration:none;font-weight:700}.back{margin-right:auto}.top-label{letter-spacing:.13em;font-size:12px;font-weight:800;color:var(--blue)}.account{margin-left:auto;font-size:13px}.loading,.error{margin:12vh auto;text-align:center;max-width:520px}.intro{max-width:1140px;margin:42px auto;padding:0 24px}.eyebrow{color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.16em}.intro h1{font-size:clamp(32px,5vw,57px);line-height:1.12;letter-spacing:-.04em;margin:9px 0 14px}.intro p{color:var(--muted);max-width:720px}.model-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin:35px 0}.model-card{min-height:154px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 9px 24px #172b4610;transition:transform .15s,border-color .15s}.model-card:hover,.model-card:focus-visible{transform:translateY(-3px);border-color:#5c8bc1;outline:0}.model-card small{display:block;color:var(--blue);font-weight:800;letter-spacing:.1em}.model-card strong{display:block;font-size:29px;margin:7px 0}.model-card span{font-size:13px;color:var(--muted)}.disclaimer{background:#f9fbfd;border:1px solid var(--line);border-radius:12px;padding:15px 18px;font-size:13px}.workspace{max-width:1600px;margin:auto;padding:23px clamp(14px,2vw,30px)}.workspace-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.workspace-head h1{margin:2px 0;font-size:27px}.workspace-head p{margin:0;color:var(--muted);font-size:13px}.ghost{background:white;border:1px solid var(--line);border-radius:9px;padding:10px 14px;color:var(--blue);font-weight:700}.columns{display:grid;grid-template-columns:210px minmax(0,1fr) 245px;gap:17px;align-items:start}.rail,.answer-sheet{background:#fff;border:1px solid var(--line);border-radius:14px;padding:17px;position:sticky;top:18px}.rail h2,.answer-sheet h2{font-size:12px;letter-spacing:.12em;margin:0 0 14px;color:var(--muted)}.skill-button,.teil-button{display:block;width:100%;border:0;background:transparent;text-align:left;border-radius:8px;padding:11px 12px;color:var(--navy)}.skill-button{font-weight:750}.skill-button small{float:right;color:var(--muted);font-size:11px}.skill-button.active,.teil-button.active{background:var(--accent);color:#174b85}.teil-list{margin:4px 0 12px 13px;border-left:1px solid var(--line);padding-left:8px}.paper{max-width:850px;min-height:1050px;margin:auto;background:var(--paper);box-shadow:0 12px 35px #172b4614;border:1px solid #e2e5e9;padding:clamp(25px,4vw,58px);color:#222;font-family:Arial,Helvetica,sans-serif}.paper-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;border-top:9px solid #dee1e5;padding-top:9px;font-size:13px}.paper-head strong{letter-spacing:.06em}.paper-sub{font-size:11px;color:#555;margin:0 0 32px;text-align:right}.paper h2{font-size:16px;margin:0 0 3px}.time{font-size:12px;color:#555;margin:0 0 20px}.instruction{white-space:pre-wrap;font-size:14px;margin-bottom:24px}.reading-text{white-space:pre-wrap;background:#fbfbfb;border:1px solid #dedede;padding:22px;margin-bottom:25px;font-size:14px;line-height:1.7}.paper-block{margin:0 0 25px}.paper-block h3{font-size:15px}.paper-question{display:grid;grid-template-columns:30px minmax(0,1fr);gap:9px;padding:10px 0;border-bottom:1px solid #efefef;font-size:14px}.number{font-weight:700}.options{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:9px}.option{display:inline-flex;align-items:center;gap:7px;cursor:pointer}.option input{accent-color:#315c91}.option-text{max-width:570px}.paper textarea{display:block;resize:vertical;width:100%;min-height:180px;border:1px solid #bbb;border-radius:4px;padding:14px;margin-top:15px}.audio-note{border-left:4px solid #d59b35;background:#fff8eb;padding:13px 15px;font-size:13px;margin-bottom:20px}.page-foot{font-size:10px;color:#777;margin-top:50px;display:flex;justify-content:space-between}.answer-sheet p{font-size:13px;color:var(--muted)}.answer-row{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:7px 0;font-size:13px}.answer-row b{color:var(--blue)}.check{width:100%;background:var(--navy);border:0;border-radius:9px;color:white;font-weight:700;padding:12px;margin-top:18px}.result{margin-top:13px;background:#e8f4e9;border-radius:8px;padding:11px;font-size:13px}.source-note{font-size:12px;color:var(--muted);margin-top:16px}.paper-nav{display:flex;justify-content:space-between;gap:12px;max-width:850px;margin:16px auto 50px}.paper-nav button{border:1px solid var(--line);background:white;border-radius:9px;padding:11px 20px;font-weight:700;color:var(--navy)}@media(max-width:1050px){.columns{grid-template-columns:180px minmax(0,1fr)}.answer-sheet{position:static;grid-column:2}.model-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:700px){.topbar{height:58px}.top-label{font-size:10px}.account{display:none}.model-grid{grid-template-columns:repeat(2,1fr)}.model-card{min-height:125px;padding:16px}.workspace-head{align-items:flex-start}.columns{display:block}.rail,.answer-sheet{position:static;margin-bottom:15px}.rail{display:flex;flex-wrap:wrap;gap:4px}.rail h2{width:100%;margin-bottom:4px}.skill-button{width:auto;flex:1 1 100px;text-align:center}.skill-button small{display:none}.teil-list{width:100%;display:flex;overflow:auto;margin:0;padding:5px 0;border:0}.teil-button{width:auto;white-space:nowrap}.paper{min-height:750px;padding:22px 18px}.paper-head{font-size:11px}.paper-question{font-size:13px}.answer-sheet{margin-top:15px}.paper-nav{margin-bottom:25px}}
.osd-audio-box{margin:0 0 24px;padding:14px;border:1px solid #cbd9e8;background:#f6f9fd;border-radius:8px}.osd-audio-box strong{display:block;font-size:13px;margin-bottom:10px}.osd-audio-frame{display:block;width:100%;height:106px;border:0;background:#fff;border-radius:6px}.osd-audio-link{display:inline-block;margin-top:8px;color:#315c91;font-size:12px;font-weight:700;text-decoration:underline}