:root{
  color-scheme:dark;
  --bg:#080c10;--bg2:#0b1117;--panel:#0e151c;--panel2:#111a22;--line:#23303b;--line2:#30404d;
  --text:#edf4f7;--muted:#8d9ba5;--soft:#b9c4ca;--accent:#6dddeb;--accent2:#a7f2f7;--danger:#ff7f87;--warn:#e8c66d;--ok:#7ce0ae;
  --shadow:0 24px 80px rgba(0,0,0,.28);--radius:12px;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --sans:Inter,"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}html{min-height:100%;background:var(--bg)}body{margin:0;min-height:100vh;font-family:var(--sans);background:radial-gradient(900px 500px at 80% -10%,rgba(109,221,235,.075),transparent 60%),linear-gradient(180deg,#080c10 0%,#090e13 100%);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased}
body:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.12;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px);background-size:32px 32px;mask-image:linear-gradient(to bottom,black,transparent 72%)}
a{color:inherit}button,input,textarea,select{font:inherit}button{cursor:pointer}.hidden{display:none!important}.mono{font-family:var(--mono)}.muted{color:var(--muted)}.accent{color:var(--accent)}
.brand{display:flex;align-items:center;gap:11px;font-weight:750;letter-spacing:.08em}.brand-mark{width:30px;height:30px;border:1px solid var(--accent);position:relative;display:grid;place-items:center;font:700 10px var(--mono);color:var(--accent)}.brand-mark:before,.brand-mark:after{content:"";position:absolute;background:var(--accent)}.brand-mark:before{width:7px;height:1px;right:-4px;top:7px}.brand-mark:after{width:1px;height:7px;left:7px;bottom:-4px}.brand-sub{font-size:10px;color:var(--muted);font-family:var(--mono);letter-spacing:.18em;text-transform:uppercase}
.topbar{height:68px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 26px;position:relative;z-index:3;background:rgba(8,12,16,.82);backdrop-filter:blur(12px)}.topbar-meta{display:flex;align-items:center;gap:18px;color:var(--muted);font:12px var(--mono)}
.entry-shell{min-height:100vh;display:grid;grid-template-rows:auto 1fr auto}.entry-main{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.75fr);gap:64px;align-items:center;width:min(1120px,calc(100% - 48px));margin:0 auto;padding:72px 0 88px}.entry-copy{max-width:650px}.eyebrow{font:600 11px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}.entry-copy h1{font-size:clamp(40px,5vw,74px);line-height:1.02;letter-spacing:-.045em;margin:0 0 24px;font-weight:700}.entry-copy p{font-size:17px;color:var(--soft);max-width:560px;margin:0}.system-row{display:flex;gap:22px;margin-top:38px;flex-wrap:wrap}.system-item{border-left:1px solid var(--line2);padding-left:12px}.system-item strong{display:block;font:600 12px var(--mono);color:var(--text)}.system-item span{font-size:12px;color:var(--muted)}
.entry-card{background:linear-gradient(180deg,rgba(17,26,34,.95),rgba(12,18,24,.96));border:1px solid var(--line2);box-shadow:var(--shadow);padding:28px;position:relative}.entry-card:before{content:"";position:absolute;width:38px;height:1px;background:var(--accent);left:-1px;top:-1px}.card-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px}.card-head h2{font-size:18px;margin:0}.status-dot{display:inline-flex;gap:7px;align-items:center;font:11px var(--mono);color:var(--muted)}.status-dot:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 14px rgba(124,224,174,.5)}
.field{display:block;margin:0 0 18px}.field>span,.field-label{display:block;font:600 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}.input,.textarea,.select{width:100%;border:1px solid var(--line2);background:#091016;color:var(--text);outline:none;padding:12px 13px;min-height:46px;border-radius:5px;transition:border .15s,box-shadow .15s}.input:focus,.textarea:focus,.select:focus{border-color:rgba(109,221,235,.75);box-shadow:0 0 0 3px rgba(109,221,235,.08)}.textarea{min-height:130px;resize:vertical}.code-input{font:600 20px var(--mono);letter-spacing:.25em}.hint{font-size:12px;color:var(--muted);margin-top:7px}.btn{border:1px solid var(--line2);background:#111a22;color:var(--text);padding:10px 15px;min-height:42px;border-radius:5px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:650;transition:.15s}.btn:hover{border-color:#465a69;background:#15212a}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#061014}.btn-primary:hover{background:var(--accent2);border-color:var(--accent2)}.btn-danger{border-color:rgba(255,127,135,.4);color:#ffadb2}.btn-ghost{background:transparent}.btn-block{width:100%}.entry-error{color:#ffafb5;font-size:13px;min-height:21px;margin:-6px 0 14px}.entry-footer{height:50px;display:flex;align-items:center;justify-content:space-between;padding:0 26px;border-top:1px solid var(--line);font:10px var(--mono);color:#63727c}
.exam-page{min-height:100vh;background:#090e13}.exam-top{height:64px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;background:rgba(8,13,17,.93);backdrop-filter:blur(12px);padding:0 20px}.exam-title{font:600 12px var(--mono);letter-spacing:.08em}.exam-progress{font:600 12px var(--mono);color:var(--muted)}.exam-time{justify-self:end;font:650 16px var(--mono);font-variant-numeric:tabular-nums}.exam-time.warning{color:var(--warn)}.exam-time.danger{color:var(--danger)}
.exam-layout{display:grid;grid-template-columns:230px minmax(0,1fr);min-height:calc(100vh - 64px)}.question-nav{border-right:1px solid var(--line);background:#0a0f14;padding:22px 18px;position:sticky;top:64px;height:calc(100vh - 64px);overflow:auto}.nav-label{font:600 10px var(--mono);letter-spacing:.15em;color:var(--muted);margin:0 0 13px}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.qnum{aspect-ratio:1;border:1px solid var(--line);background:#0d141a;color:var(--muted);font:600 11px var(--mono);border-radius:4px;position:relative}.qnum:hover{border-color:#45606f}.qnum.current{color:#061014;background:var(--accent);border-color:var(--accent)}.qnum.answered:not(.current){color:var(--text);border-color:#45616d;background:#121d24}.qnum.flagged:after{content:"";position:absolute;right:3px;top:3px;width:4px;height:4px;background:var(--warn);border-radius:50%}.nav-legend{border-top:1px solid var(--line);margin-top:20px;padding-top:16px;display:grid;gap:8px;font-size:11px;color:var(--muted)}.legend-row{display:flex;align-items:center;gap:8px}.legend-box{width:9px;height:9px;border:1px solid var(--line2)}.legend-box.done{background:#21323b}.legend-box.flag{background:var(--warn);border-color:var(--warn)}
.exam-main{min-width:0;padding:34px clamp(20px,5vw,72px) 96px}.question-wrap{max-width:960px;margin:0 auto}.section-tag{font:600 11px var(--mono);color:var(--accent);letter-spacing:.08em;margin-bottom:17px}.passage{border:1px solid var(--line);background:#0c1319;padding:22px;margin-bottom:26px}.passage-title{font-weight:700;margin-bottom:12px}.question-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.question-no{font:700 13px var(--mono);color:var(--muted);letter-spacing:.05em}.points{font:600 11px var(--mono);color:var(--muted)}.stem{font-size:17px;line-height:1.8;margin-bottom:24px;color:#f0f5f7}.stem p:first-child{margin-top:0}.stem p:last-child{margin-bottom:0}
.options{display:grid;gap:10px}.option{width:100%;display:grid;grid-template-columns:38px 1fr;gap:13px;text-align:left;align-items:start;border:1px solid var(--line);background:#0c1319;color:var(--text);padding:14px 16px 14px 12px;border-radius:7px;transition:.12s}.option:hover{border-color:#3b4f5d;background:#0e171e}.option.selected{border-color:rgba(109,221,235,.7);background:rgba(109,221,235,.07);box-shadow:inset 2px 0 0 var(--accent)}.option-letter{height:30px;display:grid;place-items:center;border:1px solid var(--line2);font:700 12px var(--mono);color:var(--muted);border-radius:4px}.option.selected .option-letter{background:var(--accent);color:#071114;border-color:var(--accent)}.option-content{padding-top:1px;min-width:0}.option-content p{margin:0}.question-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px}.subtle-btn{border:0;background:transparent;color:var(--muted);font-size:12px;padding:8px 0}.subtle-btn:hover{color:var(--text)}.subtle-btn.active{color:var(--warn)}.none-btn{border:1px dashed var(--line2);background:transparent;color:var(--muted);padding:9px 12px;border-radius:5px;font-size:12px}.none-btn.active{border-style:solid;border-color:rgba(109,221,235,.55);color:var(--accent)}
.exam-footer{position:fixed;bottom:0;left:230px;right:0;height:70px;border-top:1px solid var(--line);background:rgba(8,13,17,.95);backdrop-filter:blur(12px);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,5vw,72px);z-index:15}.save-state{font:11px var(--mono);color:var(--muted);display:flex;align-items:center;gap:8px}.save-state:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--ok)}.save-state.pending:before{background:var(--warn)}.save-state.error:before{background:var(--danger)}.footer-actions{display:flex;gap:8px}
.mobile-qbar{display:none}.modal-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.68);display:grid;place-items:center;z-index:60;padding:20px}.modal{width:min(620px,100%);max-height:min(760px,90vh);overflow:auto;border:1px solid var(--line2);background:#0d141a;box-shadow:var(--shadow);padding:24px}.modal h3{margin:0 0 8px}.modal p{color:var(--muted)}.review-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:20px 0}.review-stat{border:1px solid var(--line);padding:13px}.review-stat b{display:block;font:700 22px var(--mono)}.review-stat span{font-size:11px;color:var(--muted)}.review-grid{display:flex;flex-wrap:wrap;gap:7px;margin:16px 0 22px}.review-chip{min-width:36px;height:34px;border:1px solid var(--line2);background:#101820;color:var(--text);border-radius:4px;font:600 11px var(--mono)}.review-chip.unanswered{border-color:rgba(255,127,135,.5);color:#ffb8bd}.review-chip.flagged{box-shadow:inset 0 -2px 0 var(--warn)}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}
.result-shell{min-height:100vh;display:grid;place-items:center;padding:28px}.result-card{width:min(680px,100%);border:1px solid var(--line2);background:#0c1319;padding:38px;box-shadow:var(--shadow);text-align:center}.result-icon{width:52px;height:52px;border:1px solid var(--accent);display:grid;place-items:center;margin:0 auto 22px;color:var(--accent);font:700 20px var(--mono)}.result-card h1{font-size:30px;margin:0 0 10px}.score-display{font:700 clamp(56px,11vw,88px) var(--mono);letter-spacing:-.06em;margin:24px 0 4px}.score-max{color:var(--muted);font:12px var(--mono)}.result-meta{display:flex;justify-content:center;gap:28px;margin:28px 0;color:var(--muted);font-size:12px}.answer-review{margin-top:30px;text-align:left}.answer-review-item{border-top:1px solid var(--line);padding:18px 0}.answer-review-item h4{margin:0 0 10px}.answer-key{font:600 12px var(--mono);color:var(--accent)}
.rich p{margin:.4em 0 1em}.rich ul,.rich ol{padding-left:1.5em}.rich pre{background:#070b0e;border:1px solid var(--line);overflow:auto;padding:14px;border-radius:5px}.rich code{font-family:var(--mono);font-size:.92em}.rich img{max-width:100%;height:auto;border:1px solid var(--line);display:block;margin:14px 0}.mjx-container{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:2px 0}
.toast-stack{position:fixed;right:18px;bottom:18px;display:grid;gap:8px;z-index:100}.toast{width:min(360px,calc(100vw - 36px));border:1px solid var(--line2);background:#101820;box-shadow:0 14px 50px rgba(0,0,0,.35);padding:11px 13px;font-size:13px}.toast.error{border-color:rgba(255,127,135,.45)}.toast.success{border-color:rgba(124,224,174,.35)}
@media(max-width:820px){.topbar{padding:0 18px;height:60px}.topbar-meta{display:none}.entry-main{grid-template-columns:1fr;gap:38px;width:min(100% - 32px,600px);padding:48px 0 62px}.entry-copy h1{font-size:42px}.entry-copy p{font-size:15px}.system-row{margin-top:26px}.entry-card{padding:22px}.entry-footer{padding:0 18px}.exam-top{grid-template-columns:1fr auto;height:58px;padding:0 14px}.exam-progress{display:none}.exam-layout{display:block}.question-nav{display:none}.exam-main{padding:84px 15px 92px}.mobile-qbar{display:flex;position:fixed;top:58px;left:0;right:0;height:48px;background:#0a1015;border-bottom:1px solid var(--line);z-index:16;align-items:center;gap:7px;padding:6px 12px;overflow-x:auto;scrollbar-width:none}.mobile-qbar::-webkit-scrollbar{display:none}.mobile-qbar .qnum{flex:0 0 34px;height:34px;aspect-ratio:auto}.question-wrap{max-width:none}.question-head{margin-bottom:12px}.stem{font-size:16px;line-height:1.75}.option{grid-template-columns:34px 1fr;padding:12px 12px 12px 10px}.exam-footer{left:0;height:68px;padding:0 13px}.save-state{max-width:110px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.btn{padding:9px 12px}.question-tools{align-items:flex-start;flex-direction:column}.review-stats{grid-template-columns:1fr 1fr 1fr}.result-card{padding:28px 18px}.result-meta{gap:12px;flex-direction:column}.entry-copy .eyebrow{margin-bottom:12px}}
@media(max-width:480px){.brand-sub{display:none}.entry-copy h1{font-size:36px}.system-row{gap:14px}.system-item{width:calc(50% - 8px)}.question-no{font-size:12px}.footer-actions .btn span.optional{display:none}.modal{padding:20px 16px}.review-stats{gap:5px}.review-stat{padding:10px}.review-stat b{font-size:18px}}