:root{
 --bg:#f6f7f9;--card:#fff;--text:#17202a;--sub:#657080;--line:#dde2e8;
 --accent:#2b6cb0;--write:#176b63;--rt:#7a3fb0;--ok:#16794b;--warn:#9a5b00;--bad:#a12b2b;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",sans-serif;background:var(--bg);color:var(--text)}
button,textarea{font:inherit}
#app{max-width:680px;margin:0 auto;min-height:100vh;padding:18px 16px 40px}
.header{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:2px 0 18px}
.title{font-size:26px;font-weight:800}
.small{font-size:13px;color:var(--sub);line-height:1.5}
.card,.subject,.unitBtn{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 3px 12px rgba(0,0,0,.04)}
.card{padding:18px;margin-bottom:14px}
.subject,.unitBtn{width:100%;text-align:left;padding:18px;margin:0 0 12px}
.subject h2,.unitBtn h2{margin:0 0 7px;font-size:22px}
.subject p,.unitBtn p{margin:0;color:var(--sub);font-size:14px}
.disabled{opacity:.45}
.modeGrid{display:grid;gap:12px}
.modeBtn{width:100%;border:1px solid var(--line);background:#fff;border-radius:16px;padding:17px;text-align:left}
.modeBtn strong{display:block;font-size:19px;margin-bottom:5px}
.modeBtn.write{border-color:#b9ddd8}.modeBtn.rt{border-color:#dcc8ee}
.pill{display:inline-block;font-size:12px;font-weight:700;padding:6px 10px;border-radius:999px;background:#eef3f8;color:#35506c;margin-right:6px;margin-bottom:8px}
.writePill{background:#e9f6f4;color:#145c55}.rtPill{background:#f1e8fa;color:#62308b}
.progress{height:8px;background:#e7ebf0;border-radius:99px;overflow:hidden;margin:8px 0 16px}
.progress>div{height:100%;background:var(--accent)}
.q{font-size:23px;line-height:1.55;font-weight:800;margin:12px 0 18px}
.attn{font-size:15px;line-height:1.45;padding:10px 12px;border-radius:12px;background:#fff8e8;color:#6f4d00;margin-bottom:14px;font-weight:700}
.writeAttn{background:#edf8f6;color:#145c55}.rtAttn{background:#f6effc;color:#5d2f85}
.refBox{font-size:15px;font-weight:800;padding:10px 12px;border-radius:12px;background:#f0f4f8;margin:8px 0 12px}
.choice{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:14px;padding:14px 15px;margin:8px 0;font-weight:700;min-height:54px}
.choice.selected{border:2px solid var(--accent);background:#f1f7ff}
.answerBox{width:100%;min-height:92px;border:1.5px solid #cfd7df;border-radius:14px;padding:13px 14px;resize:vertical;background:#fff;line-height:1.5}
.primary,.secondary,.writeButton,.rtButton{width:100%;border:0;border-radius:14px;padding:15px 16px;font-weight:800;margin-top:10px;min-height:52px}
.primary{background:var(--accent);color:#fff}.writeButton{background:var(--write);color:#fff}.rtButton{background:var(--rt);color:#fff}
.primary:disabled,.writeButton:disabled,.rtButton:disabled{opacity:.45}
.secondary{background:#edf1f5;color:#28323c}.backBtn{width:auto;margin:0;padding:10px 12px;min-height:42px}
.menu{display:grid;gap:10px}.menu button{border:1px solid var(--line);background:#fff;border-radius:14px;padding:14px;text-align:left;font-weight:800}
.reveal{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}
.myAnswer{font-size:14px;line-height:1.5;background:#f5f7f9;border-radius:12px;padding:10px 12px;margin:8px 0 12px;white-space:pre-wrap}
.answer{font-size:20px;line-height:1.55;font-weight:800;color:var(--ok)}
.point{margin-top:10px;padding:11px 12px;border-radius:12px;background:#f7f7f7;font-size:15px;font-weight:700;line-height:1.45}
.rating{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:16px}
.rating button{border:0;border-radius:12px;padding:13px 6px;font-weight:800}
.good{background:#eaf7f0;color:var(--ok)}.maybe{background:#fff7e8;color:var(--warn)}.no{background:#fff0f0;color:var(--bad)}
.center{text-align:center}.big{font-size:34px;font-weight:900;margin:10px 0}
button:active{transform:scale(.99)}
@media(max-width:430px){#app{padding:14px 12px 34px}.q{font-size:21px}.card{padding:16px}}