/* ===== Board exam ===== */
.bp-card{border:2px solid var(--blue);border-radius:18px;padding:24px;background:var(--surface)}
.bp-head{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:12px}
.bp-head h3{margin:0;font-size:1.4rem}
.bp-head p{margin:4px 0 0;color:var(--muted)}
.bp-stats{display:flex;gap:10px}
.bp-stats div{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:10px 14px;text-align:center;min-width:88px}
.bp-stats b{display:block;font-size:1.3rem;color:var(--blue)}
.bp-stats span{font-size:.75rem;color:var(--muted)}
.bp-card h4{margin:18px 0 8px}
.bp-rules{margin:0 0 16px;padding-left:20px;color:var(--ink);font-size:.95rem}
.bp-rules li{margin-bottom:6px}
.bp-agree{display:flex;gap:10px;align-items:center;font-weight:600;cursor:pointer}
.bp-agree input{width:18px;height:18px;accent-color:var(--blue)}
.bp-score{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:12px}
.bp-score div{border-radius:14px;padding:14px;background:var(--surface);border:1px solid var(--line)}
.bp-score div:first-child{background:var(--blue);color:var(--on-blue);border-color:var(--blue)}
.bp-score span{display:block;font-size:.8rem;opacity:.85}
.bp-score b{font-size:2rem;line-height:1.1}
.bp-score small{margin-left:4px;opacity:.85}
@media (max-width:700px){.bp-score{grid-template-columns:1fr 1fr}}
.bp-why{color:var(--muted);margin:0 0 10px}
.bp-r{border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:14px;background:var(--bg)}
.bp-r.ok{border-left:5px solid var(--good)}
.bp-r.no{border-left:5px solid var(--bad)}
.bp-rq{position:relative;padding-right:64px;font-weight:500}
.bp-mk{position:absolute;right:0;top:0;font-weight:700;color:var(--blue)}
.bp-line{margin:8px 0;font-size:.93rem}
.bp-cols{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}
@media (max-width:760px){.bp-cols{grid-template-columns:1fr}}
.bp-cols small{display:block;font-weight:700;color:var(--muted);margin-bottom:4px}
.bp-cols .sol{border-radius:12px;border:1px solid var(--paper-edge);min-height:64px}
.bp-mine{white-space:pre-wrap}
.bp-scheme{margin-top:12px;border:1px dashed var(--line);border-radius:12px;padding:12px 14px;font-size:.92rem}
.bp-scheme ul{margin:6px 0 10px;padding-left:18px}
.bp-scheme li span{float:right;color:var(--muted);margin-left:12px}
.bp-scheme select{margin-left:8px;padding:6px 10px;border-radius:8px;border:1.5px solid var(--blue);background:var(--bg);color:var(--ink);font-family:var(--ui);font-weight:700}
body.exam-on{overflow:hidden}
body.exam-on > header, body.exam-on > main, body.exam-on > footer{visibility:hidden}
.ex-ov{position:fixed;inset:0;z-index:1000;background:var(--bg);display:flex;flex-direction:column;user-select:none;-webkit-user-select:none;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.ex-ov textarea{user-select:text;-webkit-user-select:text}
.ex-top{display:flex;align-items:center;gap:14px;padding:10px 18px;background:var(--hero-bg);color:var(--hero-ink);flex-wrap:wrap}
.ex-brand{display:flex;align-items:center;gap:10px;font-weight:700;margin-right:auto}
.ex-brand .mark{width:30px;height:30px;border-radius:8px;background:var(--hero-ink);color:var(--hero-bg);display:grid;place-items:center;font-family:var(--read);font-size:1.2rem}
.ex-timer{font-family:var(--ui);font-weight:800;font-size:1.5rem;font-variant-numeric:tabular-nums;background:color-mix(in srgb,var(--hero-ink) 14%,transparent);padding:4px 14px;border-radius:10px}
.ex-timer.low{background:var(--bad);color:#fff;animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.6}}
@media (prefers-reduced-motion:reduce){.ex-timer.low{animation:none}}
.ex-warn{font-weight:600;font-size:.9rem;opacity:.9}
.ex-warn.hot{color:#ffd2d2;opacity:1}
.ex-top .ex-sub{background:var(--hero-ink);color:var(--hero-bg);padding:9px 16px}
.ex-fsnote{background:var(--amber-soft);color:var(--ink);font-size:.88rem;padding:8px 18px}
.ex-body{flex:1;overflow:auto;padding:24px 16px 60px}
.ep{max-width:860px;margin:0 auto;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:0 12px 40px -24px rgba(0,0,0,.4)}
.ep-cover{border-bottom:2px solid var(--ink);padding-bottom:14px;margin-bottom:8px}
.ep-title{text-align:center;font-weight:800;font-size:1.25rem;letter-spacing:.02em}
.ep-title span{display:block;font-weight:500;font-size:1rem;color:var(--muted);letter-spacing:0}
.ep-meta{display:flex;justify-content:space-between;font-weight:700;margin:12px 0 6px}
.ep-gi{margin:6px 0 0;padding-left:20px;font-size:.88rem;color:var(--muted)}
.ep-sec{margin:26px 0 10px;padding:10px 14px;background:var(--surface);border-radius:10px}
.ep-sec h3{margin:0;font-size:1.05rem}
.ep-sec p{margin:2px 0 0;font-size:.9rem}
.ep-sec small{display:block;color:var(--muted);margin-top:4px}
.ep-case{margin:0 0 10px;font-family:var(--read);line-height:1.7}
.ep-q{padding:14px 0;border-bottom:1px dashed var(--line)}
.ep-qt{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:start;font-family:var(--read);font-size:1.03rem;line-height:1.6}
.ep-qt b{font-family:var(--ui);color:var(--blue)}
.ep-m{font-family:var(--ui);font-weight:700;font-size:.85rem;color:var(--muted)}
.ep-opts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:10px 0 10px 26px}
.ep-opts.one{grid-template-columns:1fr}
@media (max-width:600px){.ep-opts{grid-template-columns:1fr;margin-left:0}}
.ep-opt{display:flex;gap:8px;align-items:center;border:1.5px solid var(--line);border-radius:10px;padding:8px 10px;cursor:pointer;font-family:var(--read)}
.ep-opt:has(input:checked){border-color:var(--blue);background:var(--blue-soft)}
.ep-opt input{accent-color:var(--blue);width:17px;height:17px;margin:0;flex:none}
.ep-ta{display:block;width:100%;margin-top:10px;resize:vertical;border:1.5px solid var(--paper-edge);border-radius:10px;padding:5px 14px 5px 48px;color:var(--pen);
  font-family:"Kalam",var(--read);font-size:1.08rem;line-height:30px;background-color:var(--paper);
  background-image:linear-gradient(90deg,transparent 34px,var(--margin) 34px,var(--margin) 36px,transparent 36px),linear-gradient(transparent 29px,var(--rule) 29px);background-size:100% 100%,100% 30px;background-attachment:local;background-position:0 0,0 5px}
.ep-ta:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 25%,transparent)}
.ep-ta.sm{margin-left:0}
.ep-ta::placeholder{color:#8a8a8a}
.ep-end{text-align:center;margin-top:24px;color:var(--muted)}
.ex-modal{position:fixed;inset:0;background:rgba(0,0,0,.55);display:grid;place-items:center;z-index:1001;padding:20px}
.ex-modal[hidden]{display:none}
.ex-mbox{background:var(--bg);color:var(--ink);border-radius:18px;padding:26px;max-width:440px;width:100%;text-align:center;border:2px solid var(--blue)}
.ex-mbox h3{margin:6px 0 8px}
.ex-mbox p{color:var(--muted);margin:0 0 16px}
.ex-mbox .actions{justify-content:center}
.ex-mic{width:52px;height:52px;border-radius:50%;background:var(--bad);color:#fff;font-weight:800;font-size:1.6rem;display:grid;place-items:center;margin:0 auto}
.ex-toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px;font-size:.9rem;opacity:0;transition:.25s;pointer-events:none;z-index:1002}
.ex-toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media print{body.exam-on *{display:none!important}}
.actions .tag{align-self:center;padding:8px 14px}
.ex-sym{display:flex;gap:6px;flex-wrap:wrap;align-items:center;padding:8px 18px;background:var(--surface);border-bottom:1px solid var(--line);font-size:.85rem;color:var(--muted)}
.ex-sym button{min-width:36px;height:32px;border:1.5px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);font-family:var(--read);font-size:1rem;cursor:pointer}
.ex-sym button:hover{border-color:var(--blue);color:var(--blue)}

.bp-form{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}
.lb-school{display:block;font-size:.8rem;color:var(--muted);font-weight:400;margin-top:2px}
@media (max-width:760px){.bp-form{grid-template-columns:1fr}}
.bp-form label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.9rem}
.bp-form input{padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);font-family:var(--ui);font-size:1rem;width:100%}
.bp-form input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 22%,transparent)}
.bp-form input.bad{border-color:var(--bad)}
.bp-ph{display:flex;align-items:stretch}
.bp-ph span{display:grid;place-items:center;padding:0 10px;border:1.5px solid var(--line);border-right:0;border-radius:10px 0 0 10px;background:var(--surface);font-weight:600}
.bp-ph input{border-radius:0 10px 10px 0}
.bp-note{font-size:.85rem;color:var(--muted);margin:6px 0 0 28px}
.bp-agree{align-items:flex-start;font-weight:500;line-height:1.5}
.bp-agree input{margin-top:3px;flex:none}
.lb{margin-top:28px;border:2px solid var(--line);border-radius:18px;padding:20px;background:var(--bg)}
.lb:empty{display:none}
.lb-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.lb-head h3{margin:0;font-size:1.2rem}
.lb-mode{font-size:.8rem;font-weight:600;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 10px}
.lb-wait{color:var(--muted)}
.lb-t td{vertical-align:middle}
.lb-t tr.me td{background:var(--blue-soft)}
.lb-medal,.lb-rank{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;font-weight:800;font-size:.85rem}
.lb-medal.m0{background:#f5c542;color:#4a3500}.lb-medal.m1{background:#c9d1dc;color:#2b3442}.lb-medal.m2{background:#e0a36b;color:#4a2508}
.lb-rank{color:var(--muted)}
.lb-foot{font-size:.82rem;color:var(--muted);margin:10px 0 0}
details.q.owner{margin-top:18px}