:root{--bg:#f4f6fb;--card:#fff;--ink:#1c2333;--muted:#6b7488;--line:#e3e7f0;--brand:#3454d1;--brand-d:#2742ad;--brand-l:#e9eefc;--ok:#13875a;--okl:#e3f6ec;--warn:#b7791f;--warnl:#fdf3dc;--bad:#c53030;--badl:#fde8e8;--radius:12px;--shadow:0 1px 3px rgba(20,30,60,.08),0 6px 20px rgba(20,30,60,.05)}
@media(prefers-color-scheme:dark){:root{--bg:#0f1420;--card:#171e2e;--ink:#e8ecf5;--muted:#93a0b8;--line:#27314a;--brand:#7b93ff;--brand-d:#98abff;--brand-l:#1d2850;--okl:#10301f;--warnl:#3a2c0e;--badl:#3b1a1a;--shadow:none}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;background:var(--bg);color:var(--ink)}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
h1{font-size:1.5rem;margin:.2em 0 .6em}h2{font-size:1.15rem;margin:1.2em 0 .6em}h3{font-size:1rem;margin:1em 0 .4em}
.muted{color:var(--muted)}.small{font-size:.85rem}.right{text-align:right}.center{text-align:center}.nowrap{white-space:nowrap}.mt{margin-top:1rem}.mb{margin-bottom:1rem}
.wrap{max-width:1100px;margin:0 auto;padding:0 16px}
.topbar{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar .wrap{display:flex;align-items:center;gap:16px;min-height:56px;flex-wrap:wrap}
.brand{font-weight:700;color:var(--ink);font-size:1.05rem}.brand small{display:block;font-weight:400;color:var(--muted);font-size:.7rem;line-height:1}
.nav{display:flex;gap:4px;flex-wrap:wrap;flex:1}.nav a{padding:6px 12px;border-radius:8px;color:var(--ink)}.nav a:hover,.nav a.on{background:var(--brand-l);color:var(--brand);text-decoration:none}
.userbox{display:flex;align-items:center;gap:10px;font-size:.9rem}
main{padding:22px 0 60px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow);margin-bottom:16px}
.card h2:first-child,.card h3:first-child{margin-top:0}
.grid{display:grid;gap:14px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:800px){.g2,.g3,.g4{grid-template-columns:1fr 1fr}}@media(max-width:520px){.g2,.g3,.g4{grid-template-columns:1fr}}
.stat{padding:14px 16px;border-radius:var(--radius);background:var(--card);border:1px solid var(--line)}.stat b{display:block;font-size:1.7rem;line-height:1.2}.stat span{color:var(--muted);font-size:.85rem}
.btn{display:inline-block;border:1px solid var(--brand);background:var(--brand);color:#fff;padding:8px 16px;border-radius:9px;font:inherit;cursor:pointer;line-height:1.3}
.btn:hover{background:var(--brand-d);text-decoration:none;color:#fff}.btn.ghost{background:transparent;color:var(--brand)}.btn.ghost:hover{background:var(--brand-l)}
.btn.danger{background:var(--bad);border-color:var(--bad)}.btn.danger.ghost{background:transparent;color:var(--bad)}.btn.sm{padding:4px 10px;font-size:.85rem}.btn.lg{padding:12px 28px;font-size:1.05rem}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.line{background:#06c755;border-color:#06c755}.btn.google{background:#fff;color:#333;border-color:#ccc}.btn.block{display:block;width:100%;text-align:center}
label{display:block;font-weight:600;margin:12px 0 4px;font-size:.9rem}label.inline{display:inline;font-weight:400}label.chk{display:flex;gap:8px;align-items:flex-start;font-weight:400;margin:6px 0}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=datetime-local],input[type=date],input[type=file],input[type=search],select,textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:9px;font:inherit;background:var(--card);color:var(--ink)}
textarea{min-height:90px;resize:vertical}input:focus,select:focus,textarea:focus{outline:2px solid var(--brand);outline-offset:-1px}
input[type=checkbox],input[type=radio]{width:auto;margin-top:5px}
.hint{color:var(--muted);font-size:.82rem;margin-top:3px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}.row>*{flex:1;min-width:140px}.row .auto{flex:0 0 auto;min-width:0}
.alert{padding:11px 14px;border-radius:10px;margin:0 0 14px;border:1px solid}.a-info{background:var(--brand-l);border-color:var(--brand)}.a-success{background:var(--okl);border-color:var(--ok)}.a-warn,.a-warn-html{background:var(--warnl);border-color:var(--warn)}.a-error{background:var(--badl);border-color:var(--bad)}
table{width:100%;border-collapse:collapse}th,td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{font-size:.82rem;color:var(--muted);font-weight:600;white-space:nowrap}tbody tr:hover{background:var(--brand-l)}
.tablewrap{overflow-x:auto}
.badge{display:inline-block;padding:1px 9px;border-radius:99px;font-size:.78rem;background:var(--line);color:var(--ink);white-space:nowrap}
.b-green{background:var(--okl);color:var(--ok)}.b-red{background:var(--badl);color:var(--bad)}.b-amber{background:var(--warnl);color:var(--warn)}.b-blue,.b-indigo{background:var(--brand-l);color:var(--brand)}.b-teal{background:#dff5f3;color:#0f766e}.b-gray{background:var(--line);color:var(--muted)}
.pager{margin:14px 0;display:flex;gap:6px;flex-wrap:wrap;align-items:center}.pg{padding:3px 10px;border:1px solid var(--line);border-radius:7px;background:var(--card)}.pg.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.login-box{max-width:420px;margin:6vh auto}.login-box .card{padding:26px}
.divider{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.85rem;margin:16px 0}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--line)}
.examcard{display:flex;gap:14px;justify-content:space-between;align-items:center;flex-wrap:wrap}.examcard h3{margin:0 0 4px}
.avatar{width:96px;height:120px;object-fit:cover;border-radius:8px;border:1px solid var(--line);background:var(--bg)}.avatar.sm{width:36px;height:44px}
.kv{display:grid;grid-template-columns:140px 1fr;gap:6px 14px}.kv dt{color:var(--muted)}.kv dd{margin:0}
.score-big{font-size:2.6rem;font-weight:700;line-height:1}.pass{color:var(--ok)}.fail{color:var(--bad)}
.q-review{border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0}.q-review.ok{border-left:4px solid var(--ok)}.q-review.no{border-left:4px solid var(--bad)}.q-review.na{border-left:4px solid var(--warn)}
.stem img,.opt img{max-width:100%;height:auto}.stem p{margin:.3em 0}
.bar{height:8px;background:var(--line);border-radius:5px;overflow:hidden}.bar i{display:block;height:100%;background:var(--brand)}
.spark{display:flex;align-items:flex-end;gap:4px;height:90px}.spark div{flex:1;background:var(--brand);border-radius:3px 3px 0 0;min-height:2px;position:relative}.spark div span{position:absolute;bottom:-18px;left:50%;transform:translateX(-50%);font-size:.65rem;color:var(--muted);white-space:nowrap}
.adminlayout{display:grid;grid-template-columns:210px 1fr;gap:20px}@media(max-width:860px){.adminlayout{grid-template-columns:1fr}}
.side{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:10px;align-self:start;position:sticky;top:70px}.side a{display:block;padding:8px 12px;border-radius:8px;color:var(--ink)}.side a:hover,.side a.on{background:var(--brand-l);color:var(--brand);text-decoration:none}.side h4{margin:10px 12px 4px;color:var(--muted);font-size:.72rem;letter-spacing:.08em}
footer.site{color:var(--muted);text-align:center;font-size:.8rem;padding:20px}
.codebox{background:var(--bg);border:1px dashed var(--line);border-radius:8px;padding:10px;font-family:ui-monospace,Menlo,Consolas,monospace;word-break:break-all;font-size:.85rem}
details summary{cursor:pointer;color:var(--brand)}
/* ---- 作答頁 ---- */
body.exam-mode{user-select:none;-webkit-user-select:none;background:var(--bg)}
body.exam-mode input[type=text],body.exam-mode textarea{user-select:text;-webkit-user-select:text}
.ex-head{position:sticky;top:0;z-index:30;background:var(--card);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}.ex-head .wrap{display:flex;align-items:center;gap:14px;min-height:58px}
.timer{font-variant-numeric:tabular-nums;font-size:1.5rem;font-weight:700;padding:2px 14px;border-radius:10px;background:var(--brand-l);color:var(--brand)}.timer.low{background:var(--warnl);color:var(--warn)}.timer.crit{background:var(--badl);color:var(--bad);animation:blink 1s infinite}
@keyframes blink{50%{opacity:.55}}
.ex-body{display:grid;grid-template-columns:1fr 250px;gap:18px;padding:18px 0 90px}@media(max-width:860px){.ex-body{grid-template-columns:1fr}.navigator{order:-1}}
.qcard{min-height:320px}.qno{color:var(--muted);font-size:.9rem}.qtext{font-size:1.08rem;margin:.4em 0 1em}
.opt{display:flex;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin:8px 0;cursor:pointer;align-items:flex-start}.opt:hover{border-color:var(--brand)}.opt.sel{background:var(--brand-l);border-color:var(--brand)}.opt .lbl{font-weight:700;min-width:1.4em;color:var(--brand)}.opt input{margin-top:6px}
.navigator{align-self:start;position:sticky;top:76px}.navgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px}.navgrid button{padding:6px 0;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:8px;cursor:pointer;font:inherit}.navgrid .done{background:var(--brand-l);border-color:var(--brand);color:var(--brand)}.navgrid .cur{outline:2px solid var(--brand)}.navgrid .flag{border-color:var(--warn);box-shadow:inset 0 -3px 0 var(--warn)}
.ex-foot{position:fixed;bottom:0;left:0;right:0;background:var(--card);border-top:1px solid var(--line);padding:10px 0;z-index:25}.ex-foot .wrap{display:flex;gap:10px;justify-content:space-between;align-items:center}
.savestat{font-size:.82rem;color:var(--muted)}.savestat.err{color:var(--bad)}
.wm{position:fixed;inset:0;pointer-events:none;z-index:15;overflow:hidden;opacity:.09}.wm div{position:absolute;width:200%;left:-50%;transform:rotate(-24deg);white-space:nowrap;font-weight:700;font-size:1.1rem;letter-spacing:.12em}
.modal-bg{position:fixed;inset:0;background:rgba(10,15,30,.65);z-index:60;display:none;align-items:center;justify-content:center;padding:16px}.modal-bg.show{display:flex}.modal{background:var(--card);border-radius:14px;max-width:460px;width:100%;padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.vio{position:fixed;top:68px;left:50%;transform:translateX(-50%);z-index:50;max-width:92vw}.vio .alert{box-shadow:var(--shadow);margin:0}
@media print{body.exam-mode *{display:none!important}}