/* ═══════════════════════════════════
   Design Tokens
═══════════════════════════════════ */
:root {
  /* Color — Editorial / Judicial Document aesthetic (2026 redesign).
     Paper + ink + vermilion seal, replacing the 2020-era SaaS indigo.
     2026-Q2 升級：以 oklch() 描述，dark mode 不會「螢光化」（sRGB 的紅在暗背景
     飽和度爆衝、刺眼）；色票感知亮度（L*）穩定。
     hex fallback 保留給 < 95% 覆蓋率的舊瀏覽器。 */
  --c-paper:     #F4EFE6;  /* 象牙紙 — main bg */
  --c-paper-2:   #FBF8F1;  /* 較亮紙感（卡片底） */
  --c-ink:       #14110D;  /* 墨黑 */
  --c-vermilion: #B23A2B;  /* 朱紅印鑑（CTA / accent，全站 ≤5% 面積） */
  --c-vermilion-h: #8E2C20;
  --c-gold:      #B8893A;  /* 印泥金（次強調） */
  --c-rule:      #D9CFB8;  /* 線稿／hairline */
}
/* OKLCH override for browsers that support it（Safari 15.4+/Chrome 111+/FF 113+，
   ~95% 覆蓋率）。透過 @supports 確保不支援的瀏覽器不被打殘。
   AAA 對比目標：vermilion on paper ≥ 7:1（光亮模式 large/normal text 都過）。 */
@supports (color: oklch(0% 0 0)) {
  :root {
    --c-vermilion:   oklch(44% 0.135 32);   /* 7.1:1 on #FAF7F0 paper, AAA */
    --c-vermilion-h: oklch(38% 0.14 32);    /* hover 更深一級 */
    --c-ink:         oklch(22% 0.015 60);   /* 暖墨黑（不是純黑，讀久不刺眼） */
    --c-gold:        oklch(58% 0.115 75);
    --c-rule:        color-mix(in oklch, var(--c-ink) 14%, transparent);
    /* 衍生：vermilion 10% / 20% 罩色（accent badge / pull-quote bg） */
    --c-vermilion-10: color-mix(in oklch, var(--c-vermilion) 10%, var(--c-paper));
    --c-vermilion-20: color-mix(in oklch, var(--c-vermilion) 20%, var(--c-paper));
  }
  [data-theme="dark"] {
    --c-vermilion:   oklch(72% 0.14 32);    /* 7.4:1 on dark bg, AAA */
    --c-vermilion-h: oklch(78% 0.13 32);    /* dark mode hover 更亮（反向） */
    --c-vermilion-10: color-mix(in oklch, var(--c-vermilion) 12%, transparent);
    --c-vermilion-20: color-mix(in oklch, var(--c-vermilion) 22%, transparent);
  }
}
:root {
  /* Aliases for backward-compat — existing CSS uses these names heavily */
  --c-bg:        var(--c-paper);
  --c-surface:   var(--c-paper-2);
  --c-surface2:  #ECE5D5;
  --c-border:    var(--c-rule);
  --c-text:      var(--c-ink);
  --c-muted:     #6B6258;
  --c-primary:   var(--c-vermilion);
  --c-primary-h: var(--c-vermilion-h);
  --c-primary-10:rgba(178,58,43,.1);
  --c-primary-20:rgba(178,58,43,.22);
  --c-broker:    #B23A2B;
  --c-agent:     #6B6258;  /* 沉穩中性灰，不再用 cyan */
  --c-success:   #4F6B3A;  /* 文件綠 */
  --c-danger:    #9B2C2C;  /* 深朱 */
  --c-warning:   #B8893A;  /* 印泥金 */
  /* Editorial type stack — 2026-04-30：英文/等寬 fallback 全 system fonts。
     Source Serif 4 / Inter / JetBrains Mono 已停用（mobile LCP 救命）。 */
  --ff-serif-cn: 'Noto Serif TC', 'Source Han Serif TC', serif;
  --ff-serif-en: 'Iowan Old Style', 'Apple Garamond', Georgia, 'Source Han Serif TC', serif;
  --ff-sans-cn:  'Noto Sans TC', 'Source Han Sans TC', system-ui, sans-serif;
  --ff-sans-en:  system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --ff-mono:     ui-monospace, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
  /* Type scale (9 steps) */
  --fs-12: 12px; --fs-13: 13px; --fs-14: 14px; --fs-15: 15px;
  --fs-17: 17px; --fs-20: 20px; --fs-24: 24px; --fs-32: 32px; --fs-44: 44px;
  /* Spacing (4px base, no fractional values) */
  --sp-1:  4px;  --sp-2:  8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-6: 24px;  --sp-8: 32px;  --sp-12: 48px; --sp-16: 64px;
  /* Container widths */
  --w-content:   720px;
  --w-dashboard: 1120px;
  /* Radius — 4 steps */
  --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 24px;
  /* Shadow */
  --shadow-sm:   0 1px 3px rgba(11,16,32,.06),0 1px 2px rgba(11,16,32,.04);
  --shadow-md:   0 6px 18px rgba(11,16,32,.08),0 2px 6px rgba(11,16,32,.05);
  --shadow-lg:   0 18px 48px rgba(11,16,32,.14),0 6px 16px rgba(11,16,32,.08);
  /* Layout */
  --hdr-h: 56px;
  --nav-h: 64px;
  --sidebar-w: 240px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --action-h: 68px;
}
/* ════════════════════════════════════════════════════════════════
   Dark mode — warm zinc tonality system
   Designed for long-session Chinese reading. Synthesis of 3 UX audits:
   - Color: warm gray (zinc) outperforms cool slate for Chinese text
   - Reading: contrast capped at ~12:1 (Apple Books / Kindle range)
   - Elevation: surface L* stepping + inset highlight, NOT shadow
   ════════════════════════════════════════════════════════════════ */
[data-theme="dark"] {
  /* Surfaces — 2026-05-04 方向 C「Kindle Sepia 閱讀風」整條曲線 +12 L
     舊曲線 base #0F0C09 (L=4%) 視覺接近純黑、卡片邊界糊；
     新 base #1F1A15 (L=12%) 對齊 Kindle Sepia Dark / Apple Books，
     長時間中文閱讀更舒服，elevation 階梯維持 ΔL ≥ 6（人眼可分辨閾值）。 */
  --c-paper:     #1F1A15;  /* L0 page bg — Kindle Sepia Dark 等級 */
  --c-paper-2:   #2A241F;  /* L1 cards */
  --c-bg:        var(--c-paper);
  --c-surface:   var(--c-paper-2);
  --c-surface2:  #322C25;  /* L2 nested / hover */
  --c-surface3:  #3A3328;  /* L3 active / strong emphasis */
  --c-overlay:   #4A4138;  /* L4 modal / popover */

  /* Borders — 3 levels, all ≥ 3:1 contrast vs bg */
  --c-rule:      #4A4136;
  --c-divider:   #36302A;  /* in-card subtle separator */
  --c-border:    var(--c-rule);
  --c-border-2:  #5A5040;  /* hover, important grouping */

  /* Text — 4 levels, warm gray family for Chinese readability
     ink 從 #E8E1D2 略降到 #DDD4C2 — base 提亮後維持類似觀感，避免閃眼 */
  --c-ink:       #DDD4C2;  /* primary, ~10:1 on new base (Kindle range) */
  --c-text:      var(--c-ink);
  --c-text-2:    #C9BFAB;  /* between primary & secondary */
  --c-muted:     #ADA391;  /* secondary, ~6.5:1 */
  --c-text-3:    #7E766A;  /* tertiary, ~4.5:1 — labels, meta */
  --c-disabled:  #5A5247;  /* disabled, ~3:1 (text only) */

  /* Brand — lifted + slightly desaturated for dark BG */
  --c-vermilion:   #E07158;  /* was #D85A48 — bumped to pass 4.8:1 */
  --c-vermilion-h: #EC8A75;  /* hover LIGHTER (dark-mode correct) */
  --c-primary:     var(--c-vermilion);
  --c-primary-h:   var(--c-vermilion-h);
  --c-primary-10:  rgba(224,113,88,.14);
  --c-primary-20:  rgba(224,113,88,.28);
  --c-primary-fg:  #1A0F0C;  /* dark text on bright primary fills */

  --c-gold:        #E5B26A;

  /* States — desaturated + lifted, hue offset from brand red */
  --c-success:   #7FA968;  /* warm olive, distinct from cool slate */
  --c-danger:    #E07A6E;  /* coral, hue offset to NOT clash with primary */
  --c-warning:   var(--c-gold);

  /* Elevation — inset highlight is primary; shadow supports modals */
  --elev-inset:  inset 0 1px 0 rgba(255,255,255,.05);
  --shadow-sm:   var(--elev-inset), 0 1px 3px rgba(0,0,0,.4);
  --shadow-md:   var(--elev-inset), 0 6px 16px rgba(0,0,0,.5);
  --shadow-lg:   inset 0 1px 0 rgba(255,255,255,.08), 0 16px 40px rgba(0,0,0,.65);
}

/* ════════════════════════════════════════════════════════════════
   Component overrides — all use var(), no hardcoded hex
   ════════════════════════════════════════════════════════════════ */
[data-theme="dark"] .stat-pill { background: var(--c-surface2); border-color: var(--c-border); }
[data-theme="dark"] .stat-pill .lbl { color: var(--c-muted); }
[data-theme="dark"] .section-hdr { border-bottom: 1px solid var(--c-border); padding-bottom: 10px; }
[data-theme="dark"] .exam-badge.broker { background: rgba(224,113,88,.18); color: var(--c-primary); }
[data-theme="dark"] .exam-badge.agent  { background: rgba(132,124,112,.20); color: var(--c-text-3); }
[data-theme="dark"] .subj-card { background: var(--c-surface); border-color: var(--c-border); box-shadow: var(--elev-inset); }
[data-theme="dark"] .subj-card .name { color: var(--c-text); }
[data-theme="dark"] .pct-track { background: var(--c-surface2); }
[data-theme="dark"] .subj-card .pct-label { color: var(--c-muted); }
[data-theme="dark"] .yr-btn { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-muted); }
[data-theme="dark"] .yr-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
[data-theme="dark"] .mode-row { background: var(--c-surface2); }
[data-theme="dark"] .mode-btn { color: var(--c-muted); }
[data-theme="dark"] .mode-btn.active { background: var(--c-surface); color: var(--c-primary); }
[data-theme="dark"] .prog-track { background: var(--c-surface3); }

/* ── Question card + options (nested L1 → L2 → L3 elevation) ── */
[data-theme="dark"] .q-card {
  background: var(--c-surface);
  border-color: var(--c-border);
  box-shadow: var(--elev-inset), 0 1px 3px rgba(0,0,0,.35);
}
[data-theme="dark"] .q-num { background: var(--c-surface2); color: var(--c-muted); }
[data-theme="dark"] .opt {
  background: var(--c-surface2);   /* +6% L vs q-card; nested elevation */
  border-color: var(--c-border);
  color: var(--c-text);
  box-shadow: var(--elev-inset);
}
[data-theme="dark"] .opt:hover:not(:disabled) {
  border-color: var(--c-primary);
  background: var(--c-surface3);   /* hover = brighter, no color shift */
}
[data-theme="dark"] .opt-letter { background: var(--c-surface3); border-color: var(--c-border-2); color: var(--c-text); }

/* selected: gradient fill + glow (red, distinct from correct/wrong) */
[data-theme="dark"] .opt.selected {
  border-color: var(--c-primary);
  background: linear-gradient(180deg, rgba(224,113,88,.20), rgba(224,113,88,.08));
  box-shadow: inset 0 0 0 1px rgba(224,113,88,.30), 0 0 12px rgba(224,113,88,.15);
}
[data-theme="dark"] .opt.selected .opt-letter {
  background: var(--c-primary); border-color: var(--c-primary); color: var(--c-primary-fg);
}
/* dark mode 改 vermilion 單色系統（與 light 一致；考選部紙本邏輯：正＝朱印，誤＝退色）
   砍掉原本 olive green / coral red 雙色 — 4 色 = SaaS feedback 而非 editorial */
[data-theme="dark"] .opt.correct {
  border-color: var(--c-vermilion) !important;
  background: color-mix(in oklch, var(--c-vermilion) 12%, transparent) !important;
  box-shadow: inset 4px 0 0 var(--c-vermilion);
}
[data-theme="dark"] .opt.correct .opt-letter {
  background: var(--c-vermilion) !important;
  border-color: var(--c-vermilion) !important;
  color: var(--c-primary-fg) !important;
  box-shadow: 0 0 0 2px rgba(0,0,0,.3);
}
[data-theme="dark"] .opt.wrong {
  border-color: var(--c-border) !important;
  background: transparent !important;
  opacity: .45;
  filter: grayscale(.4);
  box-shadow: none !important;
}
[data-theme="dark"] .opt.wrong[data-user-chose="true"] {
  opacity: .75;
  border-color: var(--c-border-2, var(--c-border)) !important;
}
[data-theme="dark"] .opt.wrong .opt-letter {
  background: var(--c-surface3) !important;
  border-color: var(--c-border) !important;
  color: var(--c-muted) !important;
}

[data-theme="dark"] .feedback { background: rgba(127,169,104,.10); border-color: var(--c-success); }
[data-theme="dark"] .feedback.wrong { background: rgba(224,122,110,.10); border-color: var(--c-danger); }
[data-theme="dark"] .feedback-exp { color: var(--c-muted); }
[data-theme="dark"] .essay-card { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .essay-ans { border-color: var(--c-border); }

/* 法規 header「⋯ 更多」menu — 把目錄樹/閱讀模式/比對/考古題收進去
   原本 8 顆按鈕擠在 360px 手指誤觸，現在主要 4 顆 + 一個 ⋯ */
.law-more-wrap { position: relative; flex-shrink: 0; }
.law-more-menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: 10px; min-width: 200px;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
  z-index: 50; padding: 6px;
}
.law-more-menu[hidden] { display: none; }
.law-more-menu button {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 10px 12px;
  background: none; border: none; cursor: pointer;
  font-size: .92rem; color: var(--c-text); text-align: left;
  border-radius: 6px;
}
.law-more-menu button:hover { background: var(--c-surface2); }
.law-more-menu button svg { width: 18px; height: 18px; flex-shrink: 0; }
[data-theme="dark"] .law-more-menu {
  background: var(--c-surface); border-color: var(--c-border);
  box-shadow: 0 8px 24px rgba(0,0,0,.4);
}

/* Inline spinner for loading button states (login, signup, etc.) */
.btn-spin {
  display: inline-block; width: 12px; height: 12px;
  border: 2px solid currentColor; border-top-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: -2px; margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }
button.is-loading { cursor: wait !important; opacity: .85; }

/* Bottom nav — was using --c-disabled (2.54:1, fails WCAG AA).
   Switched to --c-text-3 (4.73:1) which passes AA for body text. */
[data-theme="dark"] #bottom-nav { background: var(--c-bg); border-color: var(--c-border); }
[data-theme="dark"] .nav-btn { color: var(--c-text-3); }
[data-theme="dark"] .nav-btn.active { color: var(--c-primary); }
[data-theme="dark"] .nav-btn:hover { color: var(--c-text-2); }
[data-theme="dark"] .nav-btn.active::after { background: var(--c-primary); }

/* Law browser */
[data-theme="dark"] .laws-search { background: var(--c-bg); border-color: var(--c-border); }
[data-theme="dark"] .search-inp { background: var(--c-surface); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .law-exam-hdr { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .law-subj-btn { background: var(--c-surface); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .law-subj-btn:hover { background: var(--c-surface2); }
[data-theme="dark"] .subj-num { background: rgba(224,113,88,.16); color: var(--c-primary); }
[data-theme="dark"] .grp-cnt { background: var(--c-surface2); color: var(--c-muted); }
[data-theme="dark"] .law-card { background: var(--c-surface); border-color: var(--c-border); box-shadow: var(--elev-inset); }
[data-theme="dark"] .law-card:hover { border-color: var(--c-primary); background: var(--c-primary-10); }
[data-theme="dark"] .law-dot { background: var(--c-primary); }
[data-theme="dark"] .law-card-body h4 { color: var(--c-text); }
[data-theme="dark"] .law-no-items { background: var(--c-surface); border-color: var(--c-border); color: var(--c-muted); }

/* Law detail */
[data-theme="dark"] .law-detail-bar { background: var(--c-bg); border-color: var(--c-border); }
[data-theme="dark"] .toc-bar { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .toc-link { background: var(--c-surface); border-color: var(--c-border); color: var(--c-muted); }
[data-theme="dark"] .toc-link:hover { border-color: var(--c-primary); color: var(--c-primary); }
[data-theme="dark"] .toc-art-inp { background: var(--c-surface); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .law-switch-btn { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-muted); }
[data-theme="dark"] .law-switch-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
[data-theme="dark"] .law-switch-item:hover { background: var(--c-surface2); border-color: var(--c-border); }
[data-theme="dark"] .law-switch-item.active { border-color: var(--c-primary); color: var(--c-primary); background: var(--c-primary-10); }
[data-theme="dark"] .law-search-bar { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .law-search-inp { background: var(--c-surface2); border-color: var(--c-primary); color: var(--c-text); }
[data-theme="dark"] .law-search-nav-btn { border-color: var(--c-border); }
[data-theme="dark"] .law-rel-notice { background: var(--c-primary-10); border-color: var(--c-primary-20); color: var(--c-primary); }
[data-theme="dark"] .law-rel-notice-btn { color: var(--c-primary); }
[data-theme="dark"] .wrong-law-link { background: var(--c-primary-10); border-color: var(--c-primary-20); }
[data-theme="dark"] .law-body { color: var(--c-text); }
[data-theme="dark"] .law-chapter-title { border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .law-article { color: var(--c-text-2); }
@media (hover: hover) {
  [data-theme="dark"] .law-article:hover { background: rgba(255,255,255,.04); }
}

/* Stats */
[data-theme="dark"] .kpi-card { background: var(--c-surface); border-color: var(--c-border); box-shadow: var(--elev-inset); }
[data-theme="dark"] .streak-card { background: var(--c-primary-10); border-color: var(--c-primary-20); }
[data-theme="dark"] .subj-row { border-color: var(--c-border); }
[data-theme="dark"] .panel { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .panel-hdr { border-color: var(--c-border); }
[data-theme="dark"] .wrong-item { border-color: var(--c-border); }
[data-theme="dark"] .ach { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-muted); }
[data-theme="dark"] .ach.earned { background: var(--c-primary-10); border-color: var(--c-primary-20); color: var(--c-primary); }
[data-theme="dark"] .ring-outer { color: var(--c-primary); }
[data-theme="dark"] .streak-num { color: var(--c-primary); }
[data-theme="dark"] .weak-subj-tag { background: rgba(224,122,110,.12); border-color: rgba(224,122,110,.30); }
[data-theme="dark"] .bookmarks-panel { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .bookmark-chip { background: var(--c-primary-10); border-color: var(--c-primary-20); color: var(--c-primary); }
[data-theme="dark"] .bookmark-chip:hover { background: var(--c-primary-20); }
[data-theme="dark"] .full-exam-bar { background: var(--c-surface); border-color: var(--c-border); }

/* Admin */
[data-theme="dark"] .admin-filters { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .filter-group select { background: var(--c-surface2); color: var(--c-text); border-color: var(--c-border); }
[data-theme="dark"] .admin-question-card { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .admin-question-card:hover { border-color: var(--c-primary); }
[data-theme="dark"] .admin-tabs { background: var(--c-surface); }
[data-theme="dark"] .admin-tab { color: var(--c-muted); }
[data-theme="dark"] .admin-tab.active { background: var(--c-surface2); color: var(--c-primary); }
[data-theme="dark"] .admin-editor { background: var(--c-surface); border-color: var(--c-border); }
[data-theme="dark"] .editor-section textarea,
[data-theme="dark"] .editor-section input[type=text],
[data-theme="dark"] .editor-opt-input { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .member-table th { background: var(--c-surface2); border-color: var(--c-border); }
[data-theme="dark"] .member-table td { border-color: var(--c-border); }
[data-theme="dark"] .member-table tr:hover td { background: var(--c-surface2); }

/* App header */
[data-theme="dark"] #app-header { background: var(--c-bg); border-color: var(--c-border); box-shadow: none; }
[data-theme="dark"] .hdr-icon-btn { color: var(--c-muted); }
[data-theme="dark"] .hdr-icon-btn:hover { background: var(--c-surface2); color: var(--c-text); }
[data-theme="dark"] #login-btn { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] #login-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
[data-theme="dark"] .user-avatar { background: var(--c-primary); color: var(--c-primary-fg); }

/* Modal — bright surface + crisp white edge + inset highlight + big shadow */
[data-theme="dark"] .modal-overlay {
  background: rgba(0,0,0,.65);
  backdrop-filter: blur(8px);
}
[data-theme="dark"] .modal {
  background: var(--c-surface2);
  border: 1px solid rgba(255,255,255,.10);
  box-shadow: 0 0 0 1px rgba(0,0,0,.6),
              inset 0 1px 0 rgba(255,255,255,.08),
              0 24px 64px rgba(0,0,0,.7);
}
[data-theme="dark"] .form-inp { background: var(--c-surface); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .google-btn { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .google-btn:hover { border-color: var(--c-primary); }
[data-theme="dark"] .divider-or { color: var(--c-muted); }
[data-theme="dark"] .divider-or::before,
[data-theme="dark"] .divider-or::after { background: var(--c-border); }
[data-theme="dark"] .form-group label { color: var(--c-muted); }
[data-theme="dark"] .login-sub { color: var(--c-muted); }

/* Action bar */
[data-theme="dark"] #action-bar { background: var(--c-bg); border-color: var(--c-border); }
[data-theme="dark"] .btn-ghost { background: var(--c-surface2); border-color: var(--c-border); color: var(--c-text); }
[data-theme="dark"] .btn-ghost:hover:not(:disabled) { background: var(--c-surface3); }

/* Exam bar */
[data-theme="dark"] #exam-bar { background: var(--c-surface); border-color: var(--c-border); color: var(--c-muted); }

/* Scrollbar */
[data-theme="dark"] ::-webkit-scrollbar-track { background: var(--c-bg); }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: var(--c-border-2); }

/* Skeleton */
[data-theme="dark"] .skel { background: linear-gradient(90deg, var(--c-surface2) 25%, var(--c-surface3) 50%, var(--c-surface2) 75%); background-size: 200% 100%; }
[data-theme="dark"] .skel-card { background: var(--c-surface); border-color: var(--c-border); }

/* ≥md tablet+ dark theme nav */
@media (min-width: 768px) {
  [data-theme="dark"] #bottom-nav { border-color: var(--c-border); background: var(--c-bg); }
  [data-theme="dark"] .nav-btn { color: var(--c-disabled); }
  [data-theme="dark"] .nav-btn.active { color: var(--c-primary); }
  [data-theme="dark"] .nav-btn:hover { color: var(--c-muted); }
}

/* ════════════════════════════════════════════════════════════════
   Reading comfort — long-session typography for Chinese text
   letter-spacing +.015–.025em mitigates halation; font-weight bump
   compensates for stroke fade on dark BG. Contrast capped at ~12:1.
   ════════════════════════════════════════════════════════════════ */
[data-theme="dark"] .q-text {
  letter-spacing: .015em;
  font-weight: 450;
}
[data-theme="dark"] .feedback-exp {
  letter-spacing: .02em;
  line-height: 1.85;
  font-size: .92rem;
}
[data-theme="dark"] .law-article,
[data-theme="dark"] .law-body,
[data-theme="dark"] .cmp-fulltext-body {
  letter-spacing: .02em;
}

/* mark.diff-key: coral + inset underline (NOT full red block — long-text safe) */
[data-theme="dark"] mark.diff-key,
[data-theme="dark"] .cmp-fulltext-body mark.diff-key {
  background: rgba(255,154,136,.10);
  color: #FF9A88;
  font-weight: 500;
  box-shadow: inset 0 -2px 0 rgba(255,154,136,.30);
}

/* law-link-inline: warm gold instead of red — denser link clusters
   stay readable without "vibrating" against dark bg */
[data-theme="dark"] .law-link-inline {
  color: var(--c-gold);
  text-decoration-color: rgba(229,178,106,.45);
  text-underline-offset: 2px;
}
[data-theme="dark"] .law-link-inline:hover { background: rgba(229,178,106,.14); color: var(--c-gold); }
/* Popover dark-mode: slightly lighter surface + stronger shadow so it
   "lifts" off body content; default --c-surface in dark is too close to bg */
[data-theme="dark"] .law-popover {
  background: var(--c-surface2, #2a221b);
  border-color: rgba(229,178,106,.20);
  box-shadow: 0 10px 32px rgba(0,0,0,.55);
}
[data-theme="dark"] .law-popover-title { color: var(--c-gold); }
[data-theme="dark"] .law-popover-link { color: var(--c-gold); }
[data-theme="dark"] .law-popover-link:hover { background: rgba(229,178,106,.16); }
[data-theme="dark"] .lp-empty-link {
  color: var(--c-gold);
  background: rgba(229,178,106,.12);
  border-color: rgba(229,178,106,.30);
}
[data-theme="dark"] .lp-empty-link:hover { background: rgba(229,178,106,.22); }

/* ════════════════════════════════════════════════════════════════
   Focus ring — double ring + glow for keyboard users on dark BG.
   Inner ring uses bg color to "cut" between border and outer ring.
   ════════════════════════════════════════════════════════════════ */
[data-theme="dark"] .opt:focus-visible,
[data-theme="dark"] .btn:focus-visible,
[data-theme="dark"] .yr-btn:focus-visible,
[data-theme="dark"] .law-card:focus-visible,
[data-theme="dark"] .subj-card:focus-visible,
[data-theme="dark"] .compare-summary-card:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--c-bg),
              0 0 0 4px var(--c-primary),
              0 0 8px rgba(224,113,88,.5);
}

/* ═══════════════════════════════════
   Reset
═══════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--ff-sans-en), var(--ff-sans-cn), -apple-system, 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  font-feature-settings: 'kern', 'liga', 'calt';
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-size: 16px; line-height: 1.6;
  background: var(--c-bg); color: var(--c-text);
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
  transition: background .2s, color .2s;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; color: inherit; font-size: 16px; }
/* iOS Safari auto-zooms on input focus when font-size < 16px.
   Force 16px on all text-like inputs to prevent that. */
input[type="text"], input[type="search"], input[type="email"],
input[type="password"], input[type="tel"], input[type="url"],
input[type="number"], textarea { font-size: 16px !important; }
a { color: inherit; text-decoration: none; }
*:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 4px; }
.hidden { display: none !important; }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0; }

/* ═══════════════════════════════════
   App Header
═══════════════════════════════════ */
#app-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: var(--hdr-h);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  display: flex; align-items: center;
  padding: 0 16px; gap: 10px;
  box-shadow: var(--shadow-sm);
  min-width: 0;   /* 防止子 flex item 強行撐開（200px viewport 爆版的根因）*/
}
#app-header > * { min-width: 0; }
.hdr-logo {
  display: flex; align-items: center; gap: 9px;
  font-size: .95rem; font-weight: 700; letter-spacing: -.02em; color: var(--c-text);
  flex-shrink: 0;
  min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 60vw;
}
/* mobile (< sm): logo 文字隱藏只留 box；login label 隱藏只留 avatar */
@media (max-width: 479.98px) {
  .hdr-logo { font-size: 0 !important; gap: 0; max-width: 32px; }   /* 強制 hide text */
  .hdr-logo .logo-box { font-size: initial !important; }
  #login-label { display: none; }
  #login-btn { padding: 4px 6px; }
  .hdr-icon-btn { width: 36px; height: 36px; flex-shrink: 0; }
  /* 手機螢幕寶貴 — 「回報問題」收進設定/底部，header 只留必要按鈕 */
  #app-header #feedback-btn { display: none; }
  #app-header { gap: 6px; padding: 0 10px; }
}
/* 訪客時：login button 朱印紅實心 + 「登入」字樣（手機也顯示），讓登入點最顯眼 */
#login-btn.guest {
  background: var(--c-vermilion, var(--c-primary)) !important;
  color: white !important;
  border-color: var(--c-vermilion, var(--c-primary)) !important;
}
@media (max-width: 479.98px) {
  /* 手機訪客：強制顯示「登入」label（即使其他 mobile rule 隱藏 #login-label）*/
  #login-btn.guest #login-label {
    display: inline !important;
    font-size: 12.5px;
    padding: 0 4px;
  }
  #login-btn.guest { padding: 4px 10px 4px 6px !important; }
}
.hdr-logo .logo-box {
  width: 32px; height: 32px; border-radius: 9px;
  background: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.hdr-logo .logo-box svg { width: 18px; height: 18px; stroke: white; }
.hdr-spacer { flex: 1; }
.hdr-icon-btn {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-muted); transition: background .15s, color .15s;
}
.hdr-icon-btn:hover { background: var(--c-surface2); color: var(--c-text); }
.hdr-icon-btn svg { width: 20px; height: 20px; }

#login-btn {
  display: flex; align-items: center; gap: 7px;
  /* 2026-05-06：左右 padding 對稱 12px（avatar 缺席時也對稱），加 min-width 防 flicker */
  padding: 6px 14px;
  min-width: 80px;
  justify-content: center;
  border-radius: 20px;
  background: var(--c-surface2);
  border: 1.5px solid var(--c-border);
  font-size: .82rem; font-weight: 600; color: var(--c-text);
  transition: all .15s; cursor: pointer;
  flex-shrink: 0;   /* CRITICAL：永遠可見，不被其他元素擠到看不見 */
}
/* Avatar 在時 padding 縮左邊（讓 avatar 貼左、登入字保持右對齊）*/
#login-btn:has(.user-avatar:not(:empty)) {
  padding: 5px 14px 5px 6px;
}
#login-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.user-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--c-primary); color: white;
  display: flex; align-items: center; justify-content: center;
  font-size: .7rem; font-weight: 700; flex-shrink: 0;
}
/* Guest 時 avatar 是空字串 → 直接收起，避免「?」讓 user 困惑（2026-05-06 修） */
.user-avatar:empty { display: none; }

/* ═══════════════════════════════════
   Shell / Main
═══════════════════════════════════ */
#main {
  padding-top: var(--hdr-h);
  padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px));
  min-height: 100dvh;
  /* P2-13: 防呆 — 即使 body overflow-x hidden 失效（如 iOS smooth-scroll 邊角）也不會拖出橫捲軸 */
  overflow-x: clip;
}
.view { display: none; }
.view.active { display: block; }
.container { max-width: 720px; margin: 0 auto; padding: 0 16px; }

/* ═══════════════════════════════════
   Bottom Nav (mobile) / Sidebar Rail (desktop)
═══════════════════════════════════ */
#bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  height: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  /* 練習是本站主軸 → 中央位 1.5x 寬，左右各兩格等寬 */
  display: grid; grid-template-columns: 1fr 1fr 1.5fr 1fr 1fr;
  box-shadow: 0 -1px 0 var(--c-border);
}
/* P2-9: 平板（≥768，未到 1024 sidebar 模式）限制最大寬度，
   避免 5 個 icon 拉滿全寬左右各一大塊空白 */
@media (min-width: 768px) and (max-width: 1023.98px) {
  #bottom-nav {
    left: 50%; right: auto;
    transform: translateX(-50%);
    max-width: 480px; width: 100%;
    border-left: 1px solid var(--c-border);
    border-right: 1px solid var(--c-border);
    border-radius: 12px 12px 0 0;
  }
}
.nav-logo { display: none; }
.nav-group-lbl { display: none; }
.nav-footer { display: none; }
.nav-btn {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; padding: 6px 2px;
  color: var(--c-muted); font-size: var(--fs-12); font-weight: 500;
  transition: color .15s, background .15s; position: relative;
  background: transparent; border: none;
}
.nav-btn svg { width: 22px; height: 22px; }
.nav-btn.active { color: var(--c-primary); }
.nav-btn.active::after {
  content: ''; position: absolute; top: 0; left: 25%; right: 25%;
  height: 2.5px; background: var(--c-primary); border-radius: 0 0 4px 4px;
}
/* 練習 = 本站主軸：mobile 走 FAB pattern + 下方小字 + 鉛筆 icon
   原 icon-only 設計 user 看不懂（icon 是 checklist 不直覺），加上「練習」文字小 label
   2026-05-06 二次調整（A+C 方案：圓形 FAB + 文字 label + 換 edit icon）
   桌機 sidebar 在 misc.css 內 reset 回普通 nav-btn 樣式 */
.nav-btn-primary {
  /* button 本身透明，視覺 FAB 在 SVG 上；按鈕 click 區涵蓋 FAB + 文字 */
  display: flex; flex-direction: column; align-items: center; justify-content: flex-end;
  height: 100%; padding: 0 0 4px 0;
  background: transparent;
  border-radius: 0;
  box-shadow: none;
  transform: none;
  width: auto;
  z-index: 2;
  gap: 0;
}
/* SVG 化身 FAB：圓形實心、突出 nav 上方、白色 icon */
.nav-btn-primary svg {
  width: 56px !important; height: 56px !important;
  padding: 13px;
  background: var(--c-vermilion, var(--c-primary));
  color: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .18), 0 2px 4px rgba(0, 0, 0, .10);
  transform: translateY(-14px);
  box-sizing: border-box;
  stroke-width: 2.2 !important;
  flex-shrink: 0;
  transition: background .15s, transform .1s, box-shadow .15s;
}
/* 「練習」文字小 label，貼著 FAB 下方
   2026-05-06 PR-A：font-size 10px → 12px（user 反映看不到，10px 中文配 700 weight 在 sub-pixel 會糊） */
.nav-btn-primary span {
  display: block;
  margin-top: -8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--c-vermilion, var(--c-primary));
  letter-spacing: .04em;
  line-height: 1;
}
.nav-btn-primary:hover svg { background: var(--c-vermilion-h, var(--c-vermilion)); }
.nav-btn-primary:active svg { transform: translateY(-11px) scale(.96); }
.nav-btn-primary.active::after { display: none; }   /* FAB 不需要 nav 上沿 bar */

/* Dark mode：陰影加深才看得到（base 提亮後） */
[data-theme="dark"] .nav-btn-primary svg {
  box-shadow: 0 4px 14px rgba(0, 0, 0, .45), 0 2px 6px rgba(0, 0, 0, .30);
}
.nav-badge {
  position: absolute; top: 4px; right: calc(50% - 22px);
  min-width: 16px; height: 16px; padding: 0 4px;
  background: var(--c-danger); color: #fff;
  border-radius: 999px; font-size: 10px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--c-surface);
}

/* ═══════════════════════════════════
   Common Components
═══════════════════════════════════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: var(--r-md);
  font-size: .9rem; font-weight: 600;
  transition: all .15s; cursor: pointer;
  min-height: 44px;
}
.btn svg { width: 17px; height: 17px; }
.btn:disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }
.btn-primary   { background: var(--c-primary); color: white; border: none; }
.btn-primary:hover:not(:disabled) { background: var(--c-primary-h); }
.btn-success   { background: var(--c-success); color: white; border: none; }
.btn-success:hover:not(:disabled) { background: #047857; }
.btn-ghost     { background: var(--c-surface); border: 1.5px solid var(--c-border); color: var(--c-text); }
.btn-ghost:hover:not(:disabled) { background: var(--c-surface2); border-color: var(--c-muted); }

.badge { font-size: .7rem; font-weight: 700; padding: 2px 8px; border-radius: 10px; }
.badge-danger  { background: rgba(220,38,38,.1);  color: var(--c-danger);  }
.badge-primary { background: var(--c-primary-10); color: var(--c-primary); }
.timer-warning { color: var(--c-warning) !important; }
.timer-danger { color: var(--c-danger) !important; animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .6; } }

.panel {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--r-lg); overflow: hidden;
  margin-bottom: 12px; box-shadow: var(--shadow-sm);
}
.panel-hdr {
  padding: 12px 16px; border-bottom: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: space-between;
}
.panel-hdr h3 { font-size: .88rem; font-weight: 700; }

/* Skeleton */
.skeleton-shimmer {
  background: linear-gradient(90deg, var(--c-border) 25%, var(--c-surface) 50%, var(--c-border) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s infinite;
}
@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@keyframes skel-shimmer { to { background-position: -200% 0; } }
.skel {
  background: linear-gradient(90deg, var(--c-surface2) 25%, var(--c-border) 50%, var(--c-surface2) 75%);
  background-size: 200% 100%;
  animation: skel-shimmer 1.4s infinite;
  border-radius: 6px;
}
.skel-line { height: 13px; margin-bottom: 10px; }
.skel-line.w40 { width: 40%; } .skel-line.w60 { width: 60%; } .skel-line.w80 { width: 80%; }
.skel-opt  { height: 50px; border-radius: var(--r-sm); margin-bottom: 8px; }
.skel-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--r-lg); padding: 16px; }

/* Empty state */
.empty {
  text-align: center; padding: 48px 20px;
  color: var(--c-muted); font-size: .9rem; line-height: 1.7;
}
.empty svg { width: 48px; height: 48px; opacity: .3; display: block; margin: 0 auto 12px; }

/* ═══════════════════════════════════
   HOME VIEW
═══════════════════════════════════ */
.home-stats {
  display: grid; grid-template-columns: repeat(3,1fr);
  gap: 10px; padding: 16px 0 4px;
}
.stat-pill {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--r-md); padding: 14px 10px;
  text-align: center; box-shadow: var(--shadow-sm);
}
.stat-pill .val { font-size: 1.35rem; font-weight: 700; color: var(--c-primary); line-height: 1.2; }
.stat-pill .lbl { font-size: .75rem; color: var(--c-muted); margin-top: 3px; }

.section-hdr {
  padding: 18px 0 10px;
  display: flex; align-items: center; gap: 10px;
}
.section-hdr h2 { font-size: 1rem; font-weight: 700; }
.exam-badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: 20px;
  font-size: .75rem; font-weight: 700;
}
.exam-badge.broker { background: rgba(178,58,43,.1); color: #B23A2B; }
.exam-badge.agent  { background: rgba(8,145,178,.1);  color: #6B6258; }
[data-theme="dark"] .exam-badge.broker { background: rgba(178,58,43,.18); color: var(--c-primary); }
[data-theme="dark"] .exam-badge.agent  { background: rgba(8,145,178,.18);  color: var(--c-text-3); }

.subject-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 4px; }

.subj-card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--r-md); padding: 14px 14px 12px;
  cursor: pointer; position: relative; overflow: hidden;
  transition: box-shadow .15s, transform .1s;
  box-shadow: var(--shadow-sm);
}
.subj-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
}
.subj-card.broker::before { background: #B23A2B; }
.subj-card.agent::before  { background: #6B6258; }
.subj-card:hover  { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.subj-card:active { transform: none; box-shadow: var(--shadow-sm); }
.subj-card .name  { font-size: .85rem; font-weight: 600; line-height: 1.4; margin-bottom: 10px; }
.pct-track { height: 4px; background: var(--c-surface2); border-radius: 2px; overflow: hidden; margin-bottom: 6px; }
.pct-fill  { height: 100%; border-radius: 2px; transition: width .5s ease; }
.subj-card.broker .pct-fill { background: #B23A2B; }
.subj-card.agent  .pct-fill { background: #6B6258; }
.subj-card .pct-label { font-size: .75rem; color: var(--c-muted); font-weight: 500; }

/* ═══════════════════════════════════