:root{
  --bg:#f4f6fb; --card:#fff; --ink:#1f2733; --muted:#6b7280; --line:#e6e9f0;
  --brand:#3b5bdb; --brand2:#5c7cfa; --ok:#2f9e44; --warn:#e8590c; --bad:#e03131;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:9}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{font-weight:700;font-size:18px;color:var(--brand);text-decoration:none}
.nav nav a{margin-left:18px;color:var(--ink);text-decoration:none;font-size:15px}
.nav nav a:hover{color:var(--brand)}
main.wrap{padding-top:26px;padding-bottom:40px}
h1{font-size:24px;margin:6px 0 18px}
h2{font-size:19px;margin:26px 0 12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:16px;
  box-shadow:0 1px 2px rgba(20,30,60,.04)}
.muted{color:var(--muted)}
.small{font-size:13px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.spacer{flex:1}
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:9px;padding:10px 18px;
  font-size:15px;cursor:pointer;text-decoration:none}
.btn:hover{background:#324db3}
.btn.ghost{background:#eef1fb;color:var(--brand)}
.btn.sm{padding:6px 12px;font-size:13px}
.btn.danger{background:#fff0f0;color:var(--bad)}
.pill{display:inline-block;background:#eef1fb;color:var(--brand);border-radius:999px;padding:2px 10px;font-size:12px}
.pill.grey{background:#eef0f4;color:var(--muted)}
input[type=text],input[type=number],textarea,select{width:100%;padding:10px 12px;border:1px solid var(--line);
  border-radius:9px;font-size:15px;font-family:inherit;background:#fff}
textarea{min-height:140px;resize:vertical}
label{display:block;font-weight:600;margin:12px 0 6px;font-size:14px}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600}
.q{border-left:3px solid var(--brand2);padding-left:14px;margin:16px 0}
.q .stem{font-weight:600;white-space:pre-wrap}
.score-big{font-size:40px;font-weight:800;color:var(--brand)}
.bar{height:10px;background:#eef0f4;border-radius:999px;overflow:hidden;margin-top:8px}
.bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--brand2),var(--brand))}
.flash{padding:10px 14px;border-radius:9px;margin-bottom:14px;font-size:14px}
.flash.ok{background:#e9fbef;color:#1b7a35;border:1px solid #b7e6c4}
.flash.err{background:#fdecec;color:#b3241f;border:1px solid #f3c0be}
details{margin-top:8px}
summary{cursor:pointer;color:var(--brand);font-size:14px}
.kv{color:var(--muted);font-size:13px}
.foot{color:var(--muted);font-size:13px;padding-top:14px;border-top:1px solid var(--line)}
.overlay{position:fixed;inset:0;background:rgba(244,246,251,.86);display:none;align-items:center;justify-content:center;
  flex-direction:column;z-index:99}
.overlay.show{display:flex}
.spin{width:42px;height:42px;border:4px solid #d7ddf0;border-top-color:var(--brand);border-radius:50%;
  animation:sp 0.9s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.awarded-full{color:var(--ok);font-weight:600}
.awarded-part{color:var(--warn);font-weight:600}
.awarded-zero{color:var(--bad);font-weight:600}