/* ============================================================
   AIX Society — 考試備試頁樣式
   金 / 灰 / 黑 / 白。沿用 site.css 的 CSS 變數，不另設色票。
   字級一律 rem，跟隨 html 字級調整器。
   ============================================================ */

.ex-main { padding-bottom: 40px; }

/* ---------- 首頁 Hero ---------- */
.ex-stats { margin-top: 26px; }

.ex-sec { padding: 44px 0 8px; }
.ex-sec h2 { font-size: 1.375rem; margin: 0 0 6px; letter-spacing: .01em; }
.ex-sec-sub { color: var(--muted); margin: 0 0 22px; font-size: .9375rem; }
.ex-sec-head { margin-bottom: 22px; }
.ex-sec-head p { color: var(--muted); margin: 0; font-size: .9375rem; }

/* ---------- 卷別卡片 ---------- */
.ex-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
  margin-top: 6px;
}
.ex-card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 22px 22px 18px; border-radius: var(--radius);
  border: 1px solid var(--line2);
  background: linear-gradient(160deg, var(--panel), var(--panel2));
  color: var(--ink); text-decoration: none;
  box-shadow: 0 10px 26px rgba(70, 58, 22, .07);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.ex-card:hover, .ex-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line);
  box-shadow: 0 18px 40px rgba(70, 58, 22, .14);
}
.ex-card h2 { font-size: 1.125rem; margin: 0; line-height: 1.35; }
.ex-card-sub { margin: 0; color: var(--muted); font-size: .8125rem; letter-spacing: .02em; }
.ex-card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.ex-code {
  font-size: .6875rem; letter-spacing: .14em; text-transform: uppercase;
  font-weight: 700; color: var(--gold);
}
.ex-badge {
  font-size: .6875rem; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--gold); white-space: nowrap;
}
.ex-facts { list-style: none; display: flex; gap: 18px; margin: 4px 0 0; padding: 0; }
.ex-facts li { display: flex; flex-direction: column; }
.ex-facts b { font-size: 1.0625rem; color: var(--ink); }
.ex-facts span { font-size: .6875rem; color: var(--muted); letter-spacing: .04em; }
.ex-go { margin-top: auto; padding-top: 12px; font-size: .8125rem; color: var(--gold); font-weight: 600; }

/* ---------- 用法四格 ---------- */
.ex-how { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.ex-how article {
  padding: 20px; border-radius: var(--radius);
  border: 1px solid var(--line2); background: var(--panel);
}
.ex-how h3 { font-size: .9375rem; margin: 0 0 8px; color: var(--gold); }
.ex-how p { margin: 0; font-size: .875rem; color: var(--ink2); line-height: 1.7; }

/* ---------- WhatsApp CTA ---------- */
.ex-cta {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 26px 28px; border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(200, 168, 92, .14), transparent 72%);
  flex-wrap: wrap;
}
.ex-cta h2 { font-size: 1.125rem; margin: 0 0 6px; }
.ex-cta p { margin: 0; color: var(--ink2); font-size: .875rem; max-width: 62ch; }

/* ---------- 即將加入 ---------- */
.ex-road { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.ex-road-col { padding: 16px 18px; border-radius: 12px; border: 1px dashed var(--line2); }
.ex-road-col h4 { margin: 0 0 8px; font-size: .8125rem; color: var(--gold); letter-spacing: .04em; }
.ex-road-col ul { margin: 0; padding-left: 18px; }
.ex-road-col li { font-size: .8125rem; color: var(--muted); line-height: 1.75; }

.ex-disc { color: var(--muted); font-size: .75rem; line-height: 1.75; max-width: 78ch; }

/* ============================================================
   單卷頁
   ============================================================ */
.ex-head { padding: 32px 0 8px; border-bottom: 1px solid var(--line2); margin-bottom: 8px; }
.ex-back { font-size: .8125rem; color: var(--muted); text-decoration: none; }
.ex-back:hover { color: var(--gold); }
.ex-head h1 { font-size: clamp(1.5rem, 1rem + 2vw, 2.25rem); margin: 14px 0 4px; }
.ex-head-en { color: var(--muted); margin: 0 0 14px; font-size: .9375rem; letter-spacing: .02em; }
.ex-head-lead { max-width: 70ch; }
.ex-kpis { list-style: none; display: flex; flex-wrap: wrap; gap: 28px; padding: 0; margin: 22px 0; }
.ex-kpis li { display: flex; flex-direction: column; }
.ex-kpis b { font-size: 1.375rem; color: var(--gold); }
.ex-kpis span { font-size: .6875rem; color: var(--muted); letter-spacing: .06em; }
.ex-head-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }

.ex-two { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.ex-info { padding: 22px; border-radius: var(--radius); border: 1px solid var(--line2); background: var(--panel); }
.ex-info h3 { font-size: .9375rem; margin: 0 0 14px; color: var(--gold); letter-spacing: .04em; }
.ex-info dl { margin: 0 0 16px; }
.ex-info dt {
  font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--gold); margin-top: 14px;
}
.ex-info dt:first-child { margin-top: 0; }
.ex-info dd { margin: 4px 0 0; font-size: .875rem; color: var(--ink2); line-height: 1.72; }
.ex-syl { list-style: none; margin: 0; padding: 0; }
.ex-syl li {
  display: flex; justify-content: space-between; gap: 14px;
  padding: 8px 0; border-bottom: 1px solid var(--line2); font-size: .875rem;
}
.ex-syl li:last-child { border-bottom: 0; }
.ex-syl b { color: var(--gold); font-variant-numeric: tabular-nums; }

/* ---------- 練習區外框 ---------- */
.ex-app {
  border: 1px solid var(--line2); border-radius: var(--radius);
  background: var(--panel); overflow: hidden;
}
.ex-tabs { display: flex; flex-wrap: wrap; border-bottom: 1px solid var(--line2); }
.ex-tab {
  flex: 1 1 auto; padding: 14px 10px; border: 0; background: transparent;
  color: var(--muted); font-size: .875rem; font-family: inherit; cursor: pointer;
  border-bottom: 2px solid transparent; transition: color .15s, border-color .15s;
}
.ex-tab:hover { color: var(--ink); }
.ex-tab.on { color: var(--gold); border-bottom-color: var(--gold); font-weight: 600; }
.ex-panel { padding: 22px; }

/* ---------- 設定面板 ---------- */
.ex-statsbar { display: flex; gap: 26px; flex-wrap: wrap; margin-bottom: 16px; }
.ex-statsbar div { display: flex; flex-direction: column; }
.ex-statsbar b { font-size: 1.125rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.ex-statsbar span { font-size: .6875rem; color: var(--muted); letter-spacing: .05em; }
.ex-note { color: var(--muted); font-size: .8125rem; line-height: 1.7; margin: 0 0 16px; }
.ex-setup-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.ex-lab { font-size: .75rem; letter-spacing: .08em; color: var(--gold); text-transform: uppercase; }
.ex-select {
  font-family: inherit; font-size: .875rem; padding: 8px 10px;
  border-radius: 9px; border: 1px solid var(--line2);
  background: var(--panel2); color: var(--ink); max-width: 100%;
}
.ex-setup .btn { margin-top: 6px; }
.ex-foot { margin-top: 18px; }
.ex-link {
  background: none; border: 0; padding: 0; cursor: pointer;
  color: var(--muted); font-size: .75rem; text-decoration: underline; font-family: inherit;
}
.ex-link:hover { color: var(--gold); }
.ex-empty { color: var(--muted); font-size: .875rem; padding: 20px 0; }

/* ---------- 答題 ---------- */
.ex-qbar { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.ex-prog-text { font-size: .75rem; color: var(--muted); letter-spacing: .06em; }
.ex-clock {
  font-size: .8125rem; font-variant-numeric: tabular-nums;
  color: var(--gold); border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px;
}
.ex-clock.warn { color: #b3261e; border-color: #b3261e; }
.ex-prog { flex: 1 1 120px; height: 3px; background: var(--line2); border-radius: 99px; overflow: hidden; }
.ex-prog i { display: block; height: 100%; background: var(--gold); transition: width .2s; }
/* 答題途中的題目語言切換：細小、不搶眼，但一定搆得到 */
.ex-qlang { flex: 0 0 auto; }
.ex-qlang-lab { display: inline-flex; align-items: center; }
.ex-select.sm {
  font-size: .75rem; padding: 2px 22px 2px 8px; height: auto;
  border: 1px solid var(--line); border-radius: 999px; background: var(--panel2);
  color: var(--ink); cursor: pointer;
}
@media (max-width: 700px) {
  .ex-qlang { order: 3; }
  .ex-prog { order: 4; flex-basis: 100%; }
}

.ex-q { margin: 0; }
.ex-q-ch {
  font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--gold); margin: 0 0 10px;
}
.ex-q-text { font-size: 1.0625rem; line-height: 1.65; margin: 0 0 18px; font-weight: 600; }
.ex-opts { display: grid; gap: 10px; }
.ex-opt {
  display: flex; align-items: flex-start; gap: 12px; text-align: left;
  padding: 13px 16px; border-radius: 12px; cursor: pointer;
  border: 1px solid var(--line2); background: var(--panel2); color: var(--ink);
  font-family: inherit; font-size: .9375rem; line-height: 1.6;
  transition: border-color .15s, background .15s;
}
.ex-opt:hover:not(:disabled) { border-color: var(--line); }
.ex-opt:disabled { cursor: default; opacity: .92; }
.ex-opt.picked { border-color: var(--gold); }
.ex-opt.ok { border-color: #2e7d43; background: rgba(46, 125, 67, .10); }
.ex-opt.bad { border-color: #b3261e; background: rgba(179, 38, 30, .10); }
.ex-key {
  flex: 0 0 22px; height: 22px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: .6875rem; font-weight: 700; background: var(--line2); color: var(--ink2);
}

.ex-explain { margin-top: 18px; padding: 16px 18px; border-radius: 12px; background: var(--bg2); }
.ex-verdict { margin: 0 0 10px; font-size: .8125rem; font-weight: 700; letter-spacing: .04em; }
.ex-verdict.ok { color: #2e7d43; }
.ex-verdict.bad { color: #b3261e; }
.ex-ex-label {
  margin: 0 0 6px; font-size: .6875rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--gold);
}
.ex-ex-body { margin: 0 0 14px; font-size: .875rem; line-height: 1.8; color: var(--ink2); }
.ex-ai-btn {
  border: 1px solid var(--line); background: transparent; color: var(--gold);
  padding: 7px 14px; border-radius: 999px; cursor: pointer;
  font-family: inherit; font-size: .8125rem;
}
.ex-ai-btn:hover { background: rgba(200, 168, 92, .12); }

.ex-nav { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }

/* ---------- 結果 ---------- */
.ex-result-score { display: flex; align-items: baseline; gap: 12px; margin: 0 0 8px; }
.ex-result-score b { font-size: 2.5rem; color: var(--gold); font-variant-numeric: tabular-nums; }
.ex-result-score span { font-size: .8125rem; color: var(--muted); letter-spacing: .06em; }
.ex-hot { list-style: none; margin: 0 0 4px; padding: 0; }
.ex-hot li {
  display: flex; justify-content: space-between; gap: 14px;
  padding: 7px 0; border-bottom: 1px solid var(--line2); font-size: .875rem;
}
.ex-hot b { color: #b3261e; }
.ex-review { list-style: none; margin: 0 0 16px; padding: 0; display: grid; gap: 8px; }
.ex-review li {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 11px 14px; border-radius: 10px; border: 1px solid var(--line2); font-size: .9375rem;
}
.ex-review li.ok { border-color: #2e7d43; }
.ex-review li.bad { border-color: #b3261e; }

/* ---------- 錯題本 ---------- */
.ex-wronglist { list-style: none; margin: 4px 0 18px; padding: 0; }
.ex-wronglist li {
  display: flex; justify-content: space-between; gap: 16px; align-items: baseline;
  padding: 11px 0; border-bottom: 1px solid var(--line2); font-size: .875rem;
}
.ex-wronglist em { font-style: normal; color: var(--gold); font-size: .75rem; white-space: nowrap; }

/* ---------- AI 對話 ---------- */
.ex-chat-log {
  max-height: 420px; overflow-y: auto; display: grid; gap: 10px;
  padding: 4px 2px 12px; margin-bottom: 12px;
}
.ex-bubble {
  padding: 11px 15px; border-radius: 14px; font-size: .875rem; line-height: 1.75;
  max-width: 88%; white-space: pre-wrap; word-break: break-word;
}
.ex-bubble.ai { background: var(--bg2); border: 1px solid var(--line2); justify-self: start; }
.ex-bubble.user { background: rgba(200, 168, 92, .16); border: 1px solid var(--line); justify-self: end; }
.ex-bubble.thinking { color: var(--muted); font-style: italic; }
.ex-sugs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.ex-sug {
  border: 1px solid var(--line2); background: transparent; color: var(--ink2);
  border-radius: 999px; padding: 6px 13px; font-size: .75rem;
  cursor: pointer; font-family: inherit;
}
.ex-sug:hover { border-color: var(--line); color: var(--gold); }
.ex-chat-form { display: flex; gap: 10px; align-items: flex-end; }
.ex-chat-form textarea {
  flex: 1; font-family: inherit; font-size: .875rem; padding: 11px 13px;
  border-radius: 12px; border: 1px solid var(--line2); background: var(--panel2);
  color: var(--ink); resize: vertical; min-height: 52px;
}
.ex-chat-form .btn { white-space: nowrap; }

/* ---------- 其他考卷 ---------- */
.ex-others { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.ex-others a {
  padding: 8px 15px; border-radius: 999px; border: 1px solid var(--line2);
  color: var(--ink2); text-decoration: none; font-size: .8125rem;
}
.ex-others a:hover { border-color: var(--line); color: var(--gold); }

/* ============================================================
   可列印題目紙
   ============================================================ */
.ex-print-body { background: #fff; color: #111; font-family: "Microsoft JhengHei", "PingFang TC", serif; }
.ex-print-bar {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 12px 20px; background: #101015; color: #f0dca4; font-size: 14px;
}
.ex-print-bar a { color: #f0dca4; text-decoration: none; }
.ex-print-bar button {
  padding: 7px 14px; border-radius: 8px; border: 1px solid #d9b451;
  background: transparent; color: #f0dca4; cursor: pointer; font-family: inherit;
}
.ex-paper { max-width: 780px; margin: 0 auto; padding: 40px 28px 60px; }
.ex-paper-head { border-bottom: 2px solid #111; padding-bottom: 14px; margin-bottom: 26px; }
.ex-paper-brand { font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: #8b6d1e; margin: 0 0 8px; }
.ex-paper-head h1 { font-size: 22px; margin: 0 0 8px; line-height: 1.4; }
.ex-paper-meta { font-size: 13px; margin: 0 0 6px; color: #333; }
.ex-paper-note { font-size: 11px; color: #777; margin: 0; }
.pq { margin: 0 0 22px; page-break-inside: avoid; }
.pq-no { font-size: 12px; color: #8b6d1e; margin: 0 0 5px; font-weight: 700; }
.pq-ch { font-weight: 400; color: #888; }
.pq-q { font-size: 15px; line-height: 1.7; margin: 0 0 8px; font-weight: 600; }
.pq-opts { list-style: none; margin: 0 0 6px; padding: 0; }
.pq-opts li { font-size: 14px; line-height: 1.8; padding-left: 26px; position: relative; }
.pq-opts .pk {
  position: absolute; left: 0; font-weight: 700; color: #8b6d1e;
}
.pq-en { font-size: 11px; color: #999; margin: 0; line-height: 1.6; }
.ex-paper-key { margin-top: 34px; padding-top: 18px; border-top: 2px solid #111; page-break-before: always; }
.ex-paper-key h2 { font-size: 16px; margin: 0 0 12px; }
.ex-paper-key ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; column-count: 2; }
.ex-paper-key li { font-size: 13px; }
.ex-paper-key li b { color: #8b6d1e; }
.ex-paper-key li span { color: #888; font-size: 11px; }
.ex-paper-foot { margin-top: 30px; font-size: 11px; color: #888; text-align: center; }

@media print {
  .ex-print-bar { display: none; }
  .ex-paper { padding: 0; max-width: none; }
  .ex-paper-key { page-break-before: always; }
  @page { margin: 16mm; }
}

/* ---------- 窄螢幕 ---------- */
@media (max-width: 700px) {
  .ex-panel { padding: 16px; }
  .ex-tab { font-size: .75rem; padding: 12px 6px; }
  .ex-facts { gap: 14px; }
  .ex-cta { padding: 20px; }
  .ex-bubble { max-width: 96%; }
  .ex-kpis { gap: 18px; }
  .ex-paper-key ul { column-count: 1; }
}