:root {
  color-scheme: light;
  --bg:#eef3f8; --surface:#fff; --surface-2:#f6f9fc; --text:#172535; --muted:#62758a;
  --line:#d7e1eb; --brand:#174f83; --brand-2:#0e6ea8; --brand-text:#fff; --soft:#e5f1fb;
  --success:#18784a; --success-bg:#e2f6eb; --warning:#a65f00; --warning-bg:#fff1d5;
  --danger:#b12b35; --danger-bg:#fde8e9; --marked:#7755b8; --marked-bg:#efe8ff;
  --shadow:0 10px 32px rgba(28,53,77,.10); --radius:14px;
  font-family:"Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;
}
:root.dark {
  color-scheme: dark;
  --bg:#0e171f; --surface:#17232d; --surface-2:#1e2d39; --text:#edf5fb; --muted:#adc0cf;
  --line:#354b5d; --brand:#6bb9ed; --brand-2:#87c9f4; --brand-text:#07141d; --soft:#173a51;
  --success:#76d7a3; --success-bg:#173c2b; --warning:#f1bd62; --warning-bg:#473517;
  --danger:#ff9298; --danger-bg:#4b2025; --marked:#c4a8ff; --marked-bg:#392c55;
  --shadow:0 12px 34px rgba(0,0,0,.28);
}
*{box-sizing:border-box} body{margin:0;background:var(--bg);color:var(--text);min-height:100vh}
button,input,select{font:inherit} button{cursor:pointer} button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid color-mix(in srgb,var(--brand) 35%,transparent);outline-offset:2px}
.shell{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px clamp(14px,3vw,34px);background:color-mix(in srgb,var(--surface) 96%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.site-footer{margin-top:auto;padding:20px 90px 22px 20px;text-align:center;color:var(--muted);border-top:1px solid var(--line);background:var(--surface)}.site-footer a{color:var(--brand);font-weight:700;text-decoration:none}.site-footer a:hover{text-decoration:underline}
.brand{display:flex;gap:10px;align-items:center}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--brand);color:var(--brand-text);font-weight:700}.brand strong{display:block}.brand small{color:var(--muted)}
.icon-btn,.btn{min-height:44px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--text);padding:9px 15px}.icon-btn{width:44px;padding:0;font-size:19px}.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--brand-text)}.btn.danger{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 45%,var(--line))}.btn.ghost{background:transparent}.btn:disabled{opacity:.45;cursor:not-allowed}
.page{width:min(1120px,calc(100% - 28px));margin:0 auto;padding:28px 0 48px}.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:22px;align-items:stretch}.hero-copy,.panel,.mode-card,.question-card,.palette,.result-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-copy{padding:clamp(24px,5vw,52px)}h1{margin:0 0 12px;font-size:clamp(29px,4vw,46px);line-height:1.2}h2{line-height:1.45}.hero-copy p{color:var(--muted);font-size:17px;line-height:1.8}.browse-cta{margin-top:8px}.hero-stats{padding:24px;display:grid;gap:12px;align-content:center}.stat{padding:15px;border-radius:11px;background:var(--surface-2)}.stat b{display:block;font-size:24px}.stat span{color:var(--muted)}
.section-title{margin:32px 0 14px}.mode-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.mode-card{padding:24px}.mode-card h2{margin:10px 0 8px}.mode-card p{color:var(--muted);line-height:1.7;min-height:56px}.mode-icon{font-size:28px}.mode-card .btn{width:100%;margin-top:10px}
.records{margin-top:20px;padding:20px}.record-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.record-cell{text-align:center;padding:12px;background:var(--surface-2);border-radius:10px}.record-cell b{display:block;font-size:20px}.record-cell span{font-size:13px;color:var(--muted)}.record-actions{margin-top:14px;display:flex;justify-content:flex-end}
.setup{width:min(760px,calc(100% - 28px));margin:0 auto;padding:28px 0}.panel{padding:clamp(20px,4vw,34px)}.back{margin-bottom:16px}.field{display:grid;gap:8px;margin:18px 0}.field label,.field>span{font-weight:600}.field small,.notice{color:var(--muted)}.input{min-height:46px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--text);padding:10px 12px;width:100%}.checks{display:flex;flex-wrap:wrap;gap:9px}.check{display:flex;align-items:center;gap:7px;min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2)}.notice{padding:11px 13px;border-radius:9px;background:var(--warning-bg);color:var(--warning)}.setup-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:24px}
.exam-head{position:sticky;top:67px;z-index:15;background:var(--surface);border-bottom:1px solid var(--line)}.exam-head-inner{width:min(1220px,calc(100% - 28px));margin:auto;padding:10px 0;display:flex;align-items:center;justify-content:space-between;gap:12px}.exam-info{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.timer{font-variant-numeric:tabular-nums;font-weight:700;padding:8px 12px;border-radius:9px;background:var(--surface-2)}.timer.low{background:var(--danger-bg);color:var(--danger)}.progress-track{height:5px;background:var(--line)}.progress-fill{height:100%;background:var(--brand);transition:width .2s}
.exam-layout{width:min(1220px,calc(100% - 28px));margin:20px auto 48px;display:grid;grid-template-columns:220px minmax(0,1fr);gap:18px;align-items:start}.palette{position:sticky;top:136px;padding:16px}.palette h3{margin:0 0 12px}.numbers{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.qnum{aspect-ratio:1;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--text);position:relative}.qnum.answered{background:var(--success-bg);border-color:var(--success);color:var(--success)}.qnum.current{background:var(--brand);border-color:var(--brand);color:var(--brand-text)}.qnum.marked::after{content:"";position:absolute;right:3px;top:3px;width:7px;height:7px;border-radius:50%;background:var(--marked)}.palette-legend{display:grid;gap:6px;margin-top:14px;color:var(--muted);font-size:13px}.legend-dot{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px}.legend-dot.a{background:var(--success-bg);border:1px solid var(--success)}.legend-dot.u{background:var(--surface);border:1px solid var(--line)}.legend-dot.m{background:var(--marked)}
.exam-layout>section{min-height:calc(100vh - 170px)}.question-card{padding:clamp(18px,4vw,34px);display:flex;flex-direction:column;min-height:calc(100vh - 190px)}.qmeta{display:flex;gap:7px;flex-wrap:wrap}.pill{padding:4px 9px;border-radius:999px;background:var(--soft);color:var(--brand);font-size:13px}.question-card h2{font-size:clamp(19px,2.5vw,25px);margin:16px 0}.figure-controls{display:flex;align-items:center;gap:7px;margin:12px 0;color:var(--muted)}.size-btn{min-width:40px;min-height:40px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--text)}.size-btn.active{background:var(--brand);color:var(--brand-text);border-color:var(--brand)}.question-image{display:block;width:auto;max-width:100%;height:auto;margin:10px auto 18px;border-radius:10px;background:#fff}.question-image.small{max-height:260px}.question-image.medium{max-height:420px}.question-image.large{max-height:none;width:100%}
.options{display:grid;gap:10px}.option{display:grid;grid-template-columns:auto auto 1fr;gap:10px;align-items:start;min-height:52px;padding:13px;border:1px solid var(--line);border-radius:11px;background:var(--surface);cursor:pointer}.option:hover{background:var(--surface-2)}.option:has(input:checked){border-color:var(--brand);background:var(--soft)}.option-letter{display:grid;place-items:center;width:27px;height:27px;border-radius:7px;background:var(--surface-2);color:var(--brand);font-weight:700}.option.correct{border-color:var(--success);background:var(--success-bg)}.option.wrong{border-color:var(--danger);background:var(--danger-bg)}
.question-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:auto;position:sticky;bottom:0;padding:14px 0 2px;background:var(--surface);border-top:1px solid var(--line)}.right-actions{display:flex;gap:9px;margin-left:auto}.keyboard-hint{color:var(--muted);font-size:12px;white-space:nowrap}.palette-finish{width:100%;margin-top:16px}.mark-btn.active{background:var(--marked-bg);border-color:var(--marked);color:var(--marked)}.feedback{margin:16px 0;padding:14px;border-radius:10px}.feedback.correct{background:var(--success-bg);color:var(--success)}.feedback.wrong{background:var(--danger-bg);color:var(--danger)}
.picker{width:min(920px,calc(100% - 28px))}.picker-head{display:flex;justify-content:space-between;gap:18px;align-items:start}.picker-head p{color:var(--muted)}.picker-head strong{white-space:nowrap;padding:9px 12px;border-radius:9px;background:var(--soft);color:var(--brand)}.picker-list{display:grid;gap:8px;max-height:58vh;overflow:auto;margin:14px 0;padding-right:4px}.picker-item{display:grid;grid-template-columns:auto 1fr;gap:11px;align-items:start;padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--surface-2)}.picker-item small{display:block;margin-top:4px;color:var(--muted);line-height:1.5}.sticky-actions{position:sticky;bottom:0;padding:12px 0;background:var(--surface)}
.browse-page{width:min(980px,calc(100% - 28px));margin:0 auto;padding:28px 0 50px}.browse-toolbar{display:grid;grid-template-columns:auto 1fr 180px;gap:18px;align-items:start;margin-bottom:20px}.browse-toolbar h1{font-size:clamp(26px,4vw,38px)}.browse-toolbar p{margin:0;color:var(--muted)}.browse-toolbar label{display:grid;gap:6px;font-weight:600}.browse-list{display:grid;gap:16px}.browse-card{padding:clamp(18px,4vw,30px);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.browse-card h2{font-size:clamp(18px,2.5vw,23px);margin:9px 0 16px}.answer-detail{margin-top:14px}.answer-detail summary{cursor:pointer;color:var(--brand);font-weight:700;padding:10px 0}
.floating-nav{position:fixed;right:max(16px,env(safe-area-inset-right));bottom:max(18px,env(safe-area-inset-bottom));z-index:40;display:grid;gap:9px}.floating-btn{display:grid;place-items:center;width:58px;min-height:58px;padding:5px;border:1px solid color-mix(in srgb,var(--brand) 45%,var(--line));border-radius:16px;background:var(--surface);color:var(--brand);box-shadow:0 8px 24px rgba(0,0,0,.18);font-size:20px;font-weight:700}.floating-btn.home{background:var(--brand);color:var(--brand-text)}.floating-btn span{font-size:11px;line-height:1.1}.floating-btn:hover{transform:translateY(-1px)}
.mobile-palette{display:none}.result-wrap{width:min(900px,calc(100% - 28px));margin:28px auto 50px}.result-card{padding:clamp(22px,5vw,44px);text-align:center}.score-ring{width:150px;height:150px;border-radius:50%;display:grid;place-items:center;margin:18px auto;background:conic-gradient(var(--brand) var(--score),var(--line) 0)}.score-inner{width:118px;height:118px;border-radius:50%;display:grid;place-items:center;background:var(--surface)}.score-inner b{font-size:34px}.pass{color:var(--success)}.fail{color:var(--danger)}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}.review-list{display:grid;gap:14px;margin-top:20px;text-align:left}.review-item{padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.review-meta{color:var(--brand);font-weight:700}.review-question{margin:9px 0 15px;padding-bottom:13px;border-bottom:1px solid var(--line);line-height:1.65}.review-options{display:grid;gap:8px}.review-option{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:11px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2)}.review-option.correct{border-color:var(--success);background:var(--success-bg)}.review-option.selected-wrong{border-color:var(--danger);background:var(--danger-bg)}.review-option strong{font-size:12px;white-space:nowrap}.empty{padding:30px;text-align:center;color:var(--muted)}
@media(max-width:780px){.hero{grid-template-columns:1fr}.mode-grid{grid-template-columns:1fr}.record-row{grid-template-columns:repeat(2,1fr)}.browse-toolbar{grid-template-columns:1fr}.exam-layout{grid-template-columns:1fr}.palette{display:none}.mobile-palette{display:block;margin-bottom:12px}.mobile-palette summary{min-height:44px;padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}.mobile-palette .numbers{grid-template-columns:repeat(8,1fr);margin-top:8px}.exam-head{top:67px}.question-actions{flex-direction:column}.keyboard-hint{display:none}.right-actions{display:grid;grid-template-columns:1fr 1fr;margin-left:0;width:100%}.question-actions>.btn{width:100%}.result-grid{grid-template-columns:1fr}.topbar .brand small{display:none}}
@media(max-width:430px){.page{width:min(100% - 18px,1120px)}.exam-layout{width:calc(100% - 18px)}.exam-head-inner{width:calc(100% - 18px)}.mobile-palette .numbers{grid-template-columns:repeat(6,1fr)}.question-card{padding:15px}.option{padding:11px}.hero-copy{padding:24px 18px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}