/* 第一試選擇題練習。沿用 shared-ui.css 的色彩變數；對比與觸控目標依 WCAG 2.2 AA。 */
*{box-sizing:border-box}
body{margin:0}
main{max-width:980px;margin:auto;padding:30px 20px 48px}
h1{font-size:30px;line-height:1.4;margin:4px 0 10px}
h2{font-size:22px;line-height:1.5;margin:6px 0 12px}
h3{font-size:17px;margin:22px 0 8px}
p{margin:8px 0}
.eyebrow{margin:0;font-size:12px;font-weight:700;letter-spacing:.04em;color:var(--green)}
.muted{color:var(--muted)}.small{font-size:13px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:0 0 20px;box-shadow:var(--shadow)}
.notice{background:var(--amber-soft);border:1px solid #e0c98d;border-radius:10px;padding:12px 16px;margin:0 0 16px;color:#5b4310}
pre{background:#f6f2ea;border:1px solid var(--line);border-radius:8px;padding:12px;overflow-x:auto;font-size:13px}
footer{max-width:980px;margin:0 auto;padding:0 20px 36px;color:var(--muted);font-size:13px}
a{color:var(--green)}
/* 控制項 */
button{font:inherit;min-height:44px;padding:9px 18px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--green);cursor:pointer;font-weight:650}
button.primary{background:var(--green);border-color:var(--green);color:#fff}
button.secondary:hover{background:var(--teal-soft)}
button.primary:hover{background:var(--navy-2)}
button:disabled{opacity:.55;cursor:default}
select,input[type=text]{display:block;width:100%;min-height:44px;border:1px solid #cfc6b6;border-radius:8px;padding:9px 12px;background:#fff;color:var(--ink);font:inherit;font-size:15px;margin:6px 0 4px}
label{font-size:14px;font-weight:600;color:var(--ink)}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.small-actions button{min-height:40px;padding:6px 14px;font-size:14px}
.filters{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px 16px;margin:14px 0}
.pill{display:inline-block;padding:3px 10px;border:1px solid var(--line);border-radius:30px;font-size:13px;background:#fff;color:var(--ink);white-space:nowrap}
.badge{display:inline-block;min-width:22px;margin-left:6px;padding:0 7px;border-radius:12px;background:var(--danger);color:#fff;font-size:12px;line-height:20px;text-align:center}
/* 分頁 */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 14px}
.tabs [role=tab]{border-radius:10px;color:var(--muted)}
.tabs [role=tab][aria-selected=true]{background:var(--green);border-color:var(--green);color:#fff}
.tabs [role=tab][aria-selected=true] .badge{background:#fff;color:var(--danger)}
[hidden]{display:none!important}
.resume{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;background:var(--teal-soft)}
/* 科目 */
fieldset{border:0;margin:0;padding:0;min-width:0}
legend{font-weight:700;padding:0;margin-bottom:6px}
.subject-group{margin:8px 0}
.subject-group>p{margin:0 0 4px;font-size:13px;color:var(--muted);font-weight:650}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:6px 14px;border:1px solid #cfc6b6;border-radius:30px;background:#fff;cursor:pointer;font-weight:600}
.chip input{width:18px;height:18px;margin:0}
.chip small{color:var(--muted);font-weight:500}
.chip:has(input:checked){background:var(--teal-soft);border-color:var(--green)}
.chip:has(input:focus-visible){outline:3px solid #bc963e;outline-offset:2px}
/* 作答 */
.session-bar{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:flex-start;margin-bottom:8px}
.session-tools{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
#timer{font-variant-numeric:tabular-nums;font-size:16px;font-weight:700}
#timer.low{border-color:var(--danger);color:var(--danger)}
progress{width:100%;height:10px;margin:4px 0 16px;accent-color:var(--green)}
.session-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
.session-layout:has(.navigator:not([hidden])){grid-template-columns:230px minmax(0,1fr);align-items:start}
.navigator{position:sticky;top:8px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px}
#navigator{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px}
#navigator button{min-height:40px;min-width:40px;padding:2px;font-size:14px}
#navigator button[data-state=answered]{background:var(--teal-soft);border-color:var(--green)}
#navigator button[data-state=flagged]{border:2px dashed var(--amber);background:var(--amber-soft);color:#5b4310}
#navigator button[data-state=skip]{opacity:.5}
#navigator button[aria-current=true]{background:var(--green);border-color:var(--green);color:#fff}
.question-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:6px;font-size:14px;color:var(--muted)}
.question-text{font-size:18px;line-height:1.85;white-space:pre-line;overflow-wrap:anywhere;margin:6px 0 14px}
.options{display:grid;gap:10px;margin:0 0 14px}
.option{display:flex;gap:12px;align-items:flex-start;min-height:52px;padding:12px 14px;border:2px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;font-weight:500;font-size:16px;line-height:1.7}
.option input{width:20px;height:20px;margin:5px 0 0;flex:0 0 auto}
.option .letter{flex:0 0 auto;font-weight:800;color:var(--green)}
.option .text{overflow-wrap:anywhere;min-width:0}
.option:has(input:checked){border-color:var(--green);background:var(--teal-soft)}
.option:has(input:focus-visible){outline:3px solid #bc963e;outline-offset:2px}
.option.correct{border-color:#cfc6b6;background:#efe8db}
.option.wrong{border-color:var(--danger);background:#f8e8e5}
.option .mark{margin-left:auto;font-weight:800;white-space:nowrap}
.option.correct .mark{color:#8a3b2e}.option.wrong .mark{color:var(--danger)}
.feedback{border-radius:12px;padding:14px 16px;margin:6px 0 12px;border:1px solid var(--line);background:#f6f2ea}
.feedback.ok{background:#efe8db;border-color:#cfc6b6}.feedback.bad{background:#f8e8e5;border-color:#dba9a2}
.feedback strong{font-size:17px}
.source{font-size:13px;color:var(--muted)}
.unscored{background:var(--amber-soft);border:1px solid #e0c98d;border-radius:12px;padding:14px 16px}
/* 結果與表格 */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:10px 0 6px}
.stat{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fbf8f2}
.stat b{display:block;font-size:26px;line-height:1.3;color:var(--ink)}.stat span{font-size:13px;color:var(--muted)}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:520px}
th,td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
th{background:#f6f2ea;font-weight:700}
tr:last-child td{border-bottom:0}
.bar{display:inline-block;vertical-align:middle;width:90px;height:10px;border-radius:5px;background:#efe8db;margin-right:8px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--green)}
.bar.weak i{background:var(--danger)}
.tag-weak{color:var(--danger);font-weight:700}
details.item{border:1px solid var(--line);border-radius:10px;margin:8px 0;background:#fff}
details.item>summary{cursor:pointer;padding:12px 14px;min-height:44px;display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center}
details.item>div{padding:0 14px 14px}
details.item .qtext{white-space:pre-line;overflow-wrap:anywhere}
.source-help{margin-top:14px}
.source-help summary{cursor:pointer;min-height:44px;display:flex;align-items:center;font-weight:650}
dialog{border:1px solid var(--line);border-radius:14px;padding:20px;max-width:min(92vw,420px)}
dialog::backdrop{background:rgba(35,53,68,.45)}
@media (max-width:760px){
 main{padding:20px 14px 40px}
 h1{font-size:25px}
 .card{padding:16px}
 .session-layout:has(.navigator:not([hidden])){grid-template-columns:minmax(0,1fr)}
 .navigator{position:static}
 .question-text{font-size:17px}
}
@media (prefers-reduced-motion:no-preference){.option,button{transition:background-color .12s,border-color .12s}}