:root {
  /* 2026-09-08 改版：專業年輕化——藍＋橙互補色，取代原本活字典的深藍金（補習班主任調性） */
  --primary: #375BF0;
  --primary-dark: #2542B8;
  --primary-soft: #6B86F5;
  --tint: #EDF1FE;
  --tint-deep: #D6E0FC;
  --gold: #FF7A45;
  --gold-dark: #DE5C22;
  --ink: #111827;
  --ink-soft: #4B5563;
  --ink-dim: #9CA3AF;
  --bg: #F9FAFB;
  --surface: #FFFFFF;
  --line: #E5E7EB;
  --line-soft: #F0F2F5;
  --ok: #2F855A;
  --ok-bg: #EAF7EF;
  --ok-line: #A7D9BC;
  --no: #C0533F;
  --no-bg: #FBECE9;
  --no-line: #E8B4A8;
  --lock: #A67C52;

  --r-lg: 20px;
  --r: 16px;
  --r-sm: 12px;
  --sh-xs: 0 1px 2px rgba(17,24,39,.04), 0 1px 3px rgba(17,24,39,.05);
  --sh-sm: 0 2px 6px rgba(17,24,39,.05), 0 1px 2px rgba(17,24,39,.04);
  --sh-md: 0 6px 20px rgba(17,24,39,.08);
  --sh-lg: 0 16px 48px rgba(17,24,39,.22);
  --ease: cubic-bezier(.22,.61,.36,1);
  --spring: cubic-bezier(.34,1.4,.64,1);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bot: env(safe-area-inset-bottom, 0px);
  --tabh: 62px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC",
    "Microsoft JhengHei", "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  padding-bottom: calc(var(--tabh) + var(--safe-bot));
}

/* 防反白／禁複製；?edit=1 校對模式不加此 class */
body.protect { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
body.protect .search-box, body.protect #searchInput {
  -webkit-user-select: text; user-select: text; -webkit-touch-callout: default;
}

button { font-family: inherit; }

/* ══ 封面 ══════════════════════════════════ */
.cover {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(175deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; overflow: hidden;
  transition: opacity .62s var(--ease), visibility .62s var(--ease);
}
.cover.hide { opacity: 0; visibility: hidden; pointer-events: none; }
/* 2026-09-08：拿掉原本的暖色發光圓斑（夜間霓虹感），改素色底 */
.cover-glow { display: none; }
.cover-inner {
  position: relative; text-align: center; padding: 0 32px; max-width: 400px;
  animation: rise .85s var(--ease) both;
}
@keyframes rise { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }
.cover-platform { font-size: 15px; font-weight: 800; letter-spacing: 3px; padding-left: 8px; opacity: .85; }
.cover-rule { width: 44px; height: 3px; border-radius: 2px; margin: 16px auto 24px; background: var(--gold); }
.cover-title { font-size: 42px; font-weight: 850; letter-spacing: -.5px; line-height: 1.18;
  margin: 0 0 14px; }
.cover-sub { font-size: 15px; letter-spacing: .3px; opacity: .86; margin: 0 0 8px; }
.cover-feat { font-size: 17px; font-weight: 700; margin: 0 0 42px; opacity: .95; }
.cover-feat .feat { font-style: italic; font-weight: 500; opacity: .7; margin-right: 4px; }
.cover-enter {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 54px; padding: 0 30px; border: 0; border-radius: 14px;
  background: var(--gold);
  color: #fff; font-size: 17px; font-weight: 750; letter-spacing: .5px; cursor: pointer;
  box-shadow: 0 6px 18px rgba(0,0,0,.18);
  transition: transform .16s var(--ease), box-shadow .16s var(--ease);
}
.cover-enter svg { width: 20px; height: 20px; }
.cover-enter:active { transform: scale(.97); box-shadow: 0 3px 10px rgba(0,0,0,.16); }

/* ══ 聯名 Bar ══════════════════════════════ */
.cobrand-bar {
  position: sticky; top: 0; z-index: 40;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; padding-top: var(--safe-top);
  box-shadow: 0 2px 12px rgba(34,56,74,.26);
}
.cobrand-inner { height: 56px; display: flex; align-items: center; gap: 6px; padding: 0 14px; }
.brand-mark { font-size: 17px; font-weight: 800; letter-spacing: 1.5px; flex: none; }
.cobrand-dot { font-size: 13px; opacity: .45; flex: none; }
.cobrand-system { font-size: 14px; font-weight: 700; opacity: .95; white-space: nowrap; flex: none; }
.cobrand-client { display: flex; align-items: baseline; min-width: 0; overflow: hidden; }
.feat { font-size: 11px; font-style: italic; opacity: .72; font-weight: 500; flex: none; margin-right: 4px; }
.client-name { font-size: 14px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.client-sub { font-size: 12px; font-weight: 600; opacity: .85; white-space: nowrap; flex: none; }

/* ══ 版面 ══════════════════════════════════ */
.view { animation: fade .32s var(--ease); }
.view[hidden] { display: none; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.content { padding: 18px 16px 8px; }

.sec-title {
  font-size: 12.5px; font-weight: 800; letter-spacing: 2.2px; color: var(--ink-dim);
  margin: 0 4px 14px; display: flex; align-items: center; gap: 10px;
}
.sec-title::after { content: ""; flex: 1; height: 1px; background: var(--line); }

/* ══ 搜尋 ══════════════════════════════════ */
.search-wrap {
  position: sticky; top: calc(56px + var(--safe-top)); z-index: 30;
  background: rgba(249,250,251,.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  padding: 12px 16px 11px; border-bottom: 1px solid var(--line);
}
.search-box {
  display: flex; align-items: center; gap: 9px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px;
  padding: 0 15px; height: 48px; box-shadow: var(--sh-xs);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.search-box:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3.5px rgba(47,74,97,.11); }
.search-icon { width: 19px; height: 19px; color: var(--ink-dim); flex: none; }
#searchInput { flex: 1; border: 0; outline: none; background: transparent; font-size: 16px; color: var(--ink); min-width: 0; }
#searchInput::placeholder { color: var(--ink-dim); }
.search-clear {
  border: 0; background: var(--line); color: var(--ink-soft);
  width: 24px; height: 24px; border-radius: 50%; font-size: 18px; line-height: 1; cursor: pointer; flex: none;
}

/* ══ 章節卡（速查）══════════════════════════ */
.chapter { margin-bottom: 12px; }
.ch-head {
  display: flex; align-items: center; gap: 12px; width: 100%;
  min-height: 60px; padding: 13px 16px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  color: var(--ink); text-align: left; cursor: pointer; box-shadow: var(--sh-sm);
  transition: transform .18s var(--ease), box-shadow .22s var(--ease),
              background .22s var(--ease), border-color .22s var(--ease);
}
.ch-head:active { transform: scale(.987); }
.ch-main { flex: 1; min-width: 0; display: block; }
.ch-name { display: block; font-size: 16.5px; font-weight: 700; letter-spacing: .2px; line-height: 1.4; }
.ch-meta { display: block; font-size: 12px; color: var(--ink-dim); font-weight: 600; margin-top: 2px; letter-spacing: .3px; }
.chevron { width: 18px; height: 18px; flex: none; color: var(--ink-dim); transition: transform .34s var(--spring); }
.chapter.open .ch-head {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-color: transparent; color: #fff; box-shadow: var(--sh-md);
}
.chapter.open .ch-head .ch-meta { color: rgba(255,255,255,.72); }
.chapter.open .chevron { transform: rotate(180deg); color: rgba(255,255,255,.9); }

.ch-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .38s var(--ease); }
.chapter.open .ch-body { grid-template-rows: 1fr; }
.ch-body > div { overflow: hidden; }
.ch-inner { padding: 12px 2px 4px; }

.ch-summary {
  font-size: 13.5px; line-height: 1.85; color: var(--ink-soft);
  background: var(--tint); border-radius: var(--r-sm);
  padding: 13px 15px; margin-bottom: 12px;
  border-left: 3px solid var(--primary-soft);
}
.ch-tagline { font-size: 12px; font-weight: 700; color: var(--primary); letter-spacing: .4px; margin-bottom: 8px; }

/* 概念條目 */
.entry {
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface);
  margin-bottom: 9px; overflow: hidden; box-shadow: var(--sh-xs);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.entry.open { border-color: var(--tint-deep); box-shadow: var(--sh-sm); }
.entry-head {
  display: flex; align-items: center; gap: 11px; width: 100%; min-height: 48px;
  padding: 12px 15px; border: 0; background: transparent;
  font-size: 15.8px; font-weight: 650; color: var(--ink); text-align: left; cursor: pointer;
}
.entry-head .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--primary); flex: none;
  transition: transform .26s var(--spring), background .2s var(--ease);
}
.entry-head .term { flex: 1; line-height: 1.5; }
.entry-head .plus {
  color: var(--ink-dim); font-size: 19px; line-height: 1; flex: none;
  transition: transform .3s var(--spring), color .2s var(--ease);
}
.entry.open .entry-head .plus { transform: rotate(135deg); color: var(--primary); }
.entry.open .entry-head .dot { transform: scale(1.5); background: var(--gold-dark); }

.entry-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .34s var(--ease); }
.entry.open .entry-body { grid-template-rows: 1fr; }
.entry-body > div { overflow: hidden; }
.entry-text { padding: 0 16px 15px 33px; font-size: 15px; line-height: 1.85; color: var(--ink-soft); }
.entry-text p { margin: 0 0 9px; }
.entry-text p:last-child { margin-bottom: 0; }
.lbl {
  display: inline-block; font-size: 11.5px; font-weight: 800; letter-spacing: .5px;
  color: var(--primary); background: var(--tint); border-radius: 5px;
  padding: 1px 7px; margin-right: 7px; vertical-align: 1.5px;
}
mark { background: rgba(196,163,111,.28); color: var(--primary-dark); padding: 0 2px; border-radius: 3px; font-weight: 700; }

/* 知識點內附的小對照表 */
.mini-tbl { margin: 4px 0 4px -17px; }
.mini-tbl .tbl-scroll { padding: 0; }
.mini-tbl table { font-size: 13px; }
.mini-tbl th, .mini-tbl td { padding: 7px 9px; }

/* 比較表 */
.tbl-card {
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface);
  margin-bottom: 9px; overflow: hidden; box-shadow: var(--sh-xs);
}
.tbl-head {
  display: flex; align-items: center; gap: 11px; width: 100%; min-height: 46px;
  padding: 11px 15px; border: 0; background: transparent;
  font-size: 15px; font-weight: 650; color: var(--ink); text-align: left; cursor: pointer;
}
.tbl-head .tag {
  font-size: 11px; font-weight: 800; color: #fff; background: var(--primary-soft);
  border-radius: 999px; padding: 2px 9px; flex: none; letter-spacing: .5px;
}
.tbl-head .term { flex: 1; }
.tbl-card .plus { color: var(--ink-dim); font-size: 19px; line-height: 1; flex: none; transition: transform .3s var(--spring); }
.tbl-card.open .plus { transform: rotate(135deg); color: var(--primary); }
.tbl-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .34s var(--ease); }
.tbl-card.open .tbl-body { grid-template-rows: 1fr; }
.tbl-body > div { overflow: hidden; }
.tbl-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; padding: 0 15px 15px; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; line-height: 1.6; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; white-space: nowrap; }
th { background: var(--tint); font-weight: 700; color: var(--primary-dark); font-size: 12.5px; }
td { color: var(--ink-soft); }
td:first-child { font-weight: 650; color: var(--ink); }

/* 鎖住章節 */
.locked-pill {
  display: flex; align-items: center; gap: 10px; width: 100%; min-height: 56px;
  padding: 13px 16px; margin-bottom: 10px;
  background: repeating-linear-gradient(-45deg, #fff, #fff 13px, #FBFAF8 13px, #FBFAF8 26px);
  border: 1px dashed #DED4C6; border-radius: var(--r);
  color: var(--ink-soft); font-size: 16px; font-weight: 650; text-align: left; cursor: pointer;
  transition: transform .16s var(--ease);
}
.locked-pill:active { transform: scale(.987); }
.locked-pill .lp-name { flex: 1; }
.locked-pill .lock-badge {
  font-size: 12px; font-weight: 800; color: var(--lock);
  background: rgba(166,124,82,.13); padding: 3px 10px; border-radius: 999px; flex: none;
}

.empty { text-align: center; color: var(--ink-dim); padding: 52px 20px; font-size: 15px; line-height: 1.8; }
.empty .big { font-size: 36px; display: block; margin-bottom: 10px; }

/* ══ 練習首頁 ══════════════════════════════ */
.mode-card {
  display: flex; align-items: center; gap: 14px; width: 100%;
  padding: 16px; margin-bottom: 11px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  text-align: left; cursor: pointer; box-shadow: var(--sh-sm);
  transition: transform .18s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}
.mode-card:active { transform: scale(.985); box-shadow: var(--sh-xs); }
.mode-icon {
  width: 46px; height: 46px; border-radius: 14px; flex: none;
  display: flex; align-items: center; justify-content: center; font-size: 21px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; box-shadow: 0 5px 14px rgba(47,74,97,.28);
}
.mode-icon.gold { background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 100%); box-shadow: 0 5px 14px rgba(169,131,77,.3); }
.mode-body { flex: 1; min-width: 0; display: block; }
.mode-name { display: block; font-size: 16.5px; font-weight: 750; color: var(--ink); line-height: 1.4; }
.mode-desc { display: block; font-size: 12.8px; color: var(--ink-dim); margin-top: 1px; line-height: 1.55; }
.mode-card .chevron { transform: rotate(-90deg); }
.mode-badge {
  font-size: 12px; font-weight: 800; color: #fff; background: var(--no);
  border-radius: 999px; padding: 2px 9px; flex: none; margin-left: 2px;
}
.mode-badge.zero { background: var(--ink-dim); }

/* 單元挑選 */
.pick-row {
  display: flex; align-items: center; gap: 12px; width: 100%;
  padding: 14px 16px; margin-bottom: 9px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-sm);
  text-align: left; cursor: pointer; box-shadow: var(--sh-xs);
  transition: transform .16s var(--ease), border-color .2s var(--ease);
}
.pick-row:active { transform: scale(.987); }
.pick-main { flex: 1; min-width: 0; display: block; }
.pick-name { display: block; font-size: 15.5px; font-weight: 700; color: var(--ink); line-height: 1.4; }
.pick-meta { display: block; font-size: 12px; color: var(--ink-dim); margin-top: 2px; }
.pick-acc { font-size: 13px; font-weight: 800; color: var(--primary); flex: none; }
.pick-acc.dim { color: var(--ink-dim); font-weight: 600; }

/* 引流版：免費額度用完的科目變暗。
   不用鎖頭圖示——一整排鎖頭觀感很糟（子堯 2026-09-08），
   用「暗掉＋已完成」表達額度用完，按下去一樣會跳升級提示。 */
.pick-row.used { background: var(--line-soft); border-color: var(--line); box-shadow: none; }
.pick-row.used .pick-name { color: var(--ink-dim); }
.pick-row.used .pick-meta { color: var(--ink-dim); }

/* ══ 隨手筆記 ／ 錯題回顧（完整版）══════════ */
.note-wrap { margin-top: 8px; }
.note-input {
  width: 100%; box-sizing: border-box; resize: vertical;
  padding: 10px 12px; border: 1.5px solid var(--line); border-radius: var(--r-sm);
  background: var(--surface); color: var(--ink);
  font-family: inherit; font-size: 14px; line-height: 1.7; outline: none;
  transition: border-color .18s var(--ease);
}
.note-input:focus { border-color: var(--primary-soft); }
.note-input::placeholder { color: var(--ink-dim); }
.note-inline { margin: 14px 0 4px; padding: 12px 14px; background: var(--line-soft); border-radius: var(--r-sm); }
.note-h { font-size: 12px; font-weight: 800; color: var(--ink-dim); letter-spacing: .5px; margin-bottom: 6px; }
.review-actions { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }

/* 升級輪播的頁數指示點：讓人知道還有幾頁，不會覺得沒完沒了 */
.upg-dots { display: flex; justify-content: center; gap: 6px; margin: 16px 0 4px; }
.upg-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--line); transition: background .2s var(--ease), width .2s var(--ease); }
.upg-dot.on { width: 18px; border-radius: 3px; background: var(--primary); }

/* 輕量提示條（例如「免費練習還剩 3 科」），自己淡出 */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabh) + var(--safe-bot) + 18px);
  transform: translate(-50%, 12px); z-index: 400;
  max-width: 88%; padding: 11px 18px; border-radius: 999px;
  background: rgba(17,24,39,.92); color: #fff; font-size: 14px; font-weight: 650;
  box-shadow: var(--sh-md); opacity: 0; pointer-events: none;
  transition: opacity .28s var(--ease), transform .28s var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ══ 自製廣告輪播看板（引流版）══════════════
   ⚠️ 這是自家連結的宣傳版位，不是第三方廣告聯盟。
   刻意做小、不蓋內容——它是多一個導購入口，不是主線。 */
.adbar {
  display: block; width: 100%; margin: 0 0 12px;
  padding: 10px 14px; border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--tint) 0%, var(--tint-deep) 100%);
  border: 1px solid var(--tint-deep);
  color: var(--primary-dark); text-align: left; text-decoration: none;
  font-size: 13px; font-weight: 700; line-height: 1.5;
  display: flex; align-items: center; gap: 10px;
  transition: opacity .3s var(--ease);
}
.adbar.fade { opacity: 0; }
.adbar .ad-tag {
  flex: none; font-size: 10.5px; font-weight: 800; letter-spacing: .5px;
  color: #fff; background: var(--gold); border-radius: 4px; padding: 2px 6px;
}
.adbar .ad-text { flex: 1; min-width: 0; }
.adbar .ad-go { flex: none; font-size: 15px; color: var(--primary); }

.chips { display: flex; gap: 9px; margin-bottom: 12px; }
.chip {
  flex: 1; min-height: 56px; border-radius: var(--r-sm);
  border: 1.5px solid var(--line); background: var(--surface); cursor: pointer;
  font-size: 17px; font-weight: 800; color: var(--ink);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0;
  transition: all .2s var(--ease);
}
.chip small { font-size: 11px; font-weight: 600; color: var(--ink-dim); letter-spacing: .5px; }
.chip.on { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(47,74,97,.3); }
.chip.on small { color: rgba(255,255,255,.75); }
.chip:active { transform: scale(.97); }

.btn-primary {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; min-height: 52px; border: 0; border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; font-size: 16.5px; font-weight: 750; letter-spacing: 1px; cursor: pointer;
  box-shadow: 0 8px 22px rgba(47,74,97,.3);
  transition: transform .16s var(--ease), box-shadow .2s var(--ease);
}
.btn-primary:active { transform: scale(.985); box-shadow: 0 4px 12px rgba(47,74,97,.26); }
.btn-primary[disabled] { opacity: .45; box-shadow: none; }
.btn-ghost {
  width: 100%; min-height: 46px; margin-top: 10px; border: 1px solid var(--line);
  border-radius: var(--r-sm); background: var(--surface); color: var(--ink-soft);
  font-size: 15px; font-weight: 650; cursor: pointer;
}
.btn-ghost:active { background: var(--line-soft); }

.hint {
  font-size: 12.5px; line-height: 1.75; color: var(--ink-dim);
  background: var(--line-soft); border-radius: var(--r-sm); padding: 11px 13px; margin-top: 12px;
}

/* ══ 作答面板 ══════════════════════════════ */
.runner {
  position: fixed; inset: 0; z-index: 120;
  max-width: 480px; margin: 0 auto;
  background: var(--bg); display: flex; flex-direction: column;
  animation: slideUp .36s var(--ease);
}
.runner[hidden] { display: none; }
@keyframes slideUp { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }
.runner-bar {
  display: flex; align-items: center; gap: 10px; flex: none;
  padding: var(--safe-top) 12px 0; height: calc(56px + var(--safe-top));
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff;
}
.runner-back {
  width: 38px; height: 38px; border: 0; border-radius: 11px; flex: none;
  background: rgba(255,255,255,.14); color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.runner-back svg { width: 20px; height: 20px; }
.runner-back:active { background: rgba(255,255,255,.26); }
.runner-title { flex: 1; font-size: 15.5px; font-weight: 750; letter-spacing: .5px; }
.runner-count { font-size: 13.5px; font-weight: 700; opacity: .82; font-variant-numeric: tabular-nums; }
.progress { height: 3px; background: var(--tint-deep); flex: none; }
.progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold-dark) 100%);
  transition: width .42s var(--ease);
}
.runner-scroll { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding: 20px 16px 8px; }
.runner-foot { flex: none; padding: 10px 16px calc(14px + var(--safe-bot)); background: var(--bg); border-top: 1px solid var(--line); }

/* 題目上緣：左考點、右上角年份徽章 */
.q-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 10px; margin-bottom: 8px;
}
.q-src { font-size: 12px; font-weight: 700; color: var(--ink-dim); letter-spacing: .5px; flex: 1; min-width: 0; }
.q-year {
  flex: none; align-self: flex-start;
  padding: 3px 9px; border-radius: 999px;
  background: var(--tint); border: 1px solid var(--tint-deep);
  color: var(--primary); font-size: 11.5px; font-weight: 800; letter-spacing: .04em;
  white-space: nowrap;
}
/* 🔴 2026-09-09 新增：多選題徽章。
   跟年份徽章並排放在題目上方，用強調色（橘）跟年份徽章（藍）區隔，
   讓學生在動手點之前就知道這題要選不只一個。
   ⚠️ 不要做成跟 .q-year 一樣的顏色——一樣色就等於沒有標示。 */
/* 🔴 2026-09-09 新增：練習清單頂端的科目快速切換。
   起因是完整版 56 份考卷，想單練英文得先滑過 11 份社會。
   橫向可捲，科目多也不會擠爆；選中的用主色實心，未選的是白底細框。 */
.subj-bar {
  display: flex; gap: 8px; overflow-x: auto; padding: 2px 2px 12px;
  -webkit-overflow-scrolling: touch; scrollbar-width: none;
}
.subj-bar::-webkit-scrollbar { display: none; }
.subj-chip {
  flex: none; padding: 8px 15px; border-radius: 999px;
  border: 1.5px solid var(--line); background: var(--surface);
  color: var(--ink-soft); font-size: 14px; font-weight: 700;
  white-space: nowrap; cursor: pointer;
}
.subj-chip.on { background: var(--primary); border-color: var(--primary); color: #fff; }

.q-multi {
  flex: none; align-self: flex-start;
  padding: 3px 9px; border-radius: 999px;
  background: var(--gold); border: 1px solid var(--gold-dark);
  color: #fff; font-size: 11.5px; font-weight: 800; letter-spacing: .04em;
  white-space: nowrap; margin-left: auto;
}
.q-multi + .q-year { margin-left: 6px; }

.ri-year { float: right; margin: 0 0 6px 8px; }
.q-stem {
  font-size: 17px; line-height: 1.85; color: var(--ink); font-weight: 600;
  margin-bottom: 18px; letter-spacing: .1px;
}
.opt {
  display: flex; gap: 11px; align-items: flex-start; width: 100%;
  padding: 14px 15px; margin-bottom: 10px;
  border: 1.5px solid var(--line); border-radius: var(--r-sm);
  background: var(--surface); color: var(--ink);
  font-size: 15.5px; line-height: 1.65; text-align: left; cursor: pointer;
  box-shadow: var(--sh-xs);
  transition: border-color .22s var(--ease), background .22s var(--ease),
              transform .14s var(--ease), box-shadow .22s var(--ease);
}
.opt:active { transform: scale(.99); }
.opt .k {
  width: 24px; height: 24px; border-radius: 8px; flex: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 12.5px; font-weight: 800;
  background: var(--tint); color: var(--primary); margin-top: 1px;
}
.opt .t { flex: 1; }
/* 選項本身是圖的題目（社會科的地圖題、示意圖題）：上面看圖，下面用純字母按鈕作答。
   選項文字是空的，讓字母置中，看起來才像刻意設計而不是壞掉。 */
.opt .t:empty { display: none; }
.opt:has(.t:empty) { justify-content: center; padding: 12px 15px; }
.opt:has(.t:empty) .k { width: 30px; height: 30px; font-size: 15px; }
.opt.sel { border-color: var(--primary); background: var(--tint); }
.opt.sel .k { background: var(--primary); color: #fff; }
.opt.correct { border-color: var(--ok-line); background: var(--ok-bg); color: #1F5C3D; font-weight: 650; }
.opt.correct .k { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--no-line); background: var(--no-bg); color: #8A3A2B; }
.opt.wrong .k { background: var(--no); color: #fff; }
.opt[disabled] { cursor: default; }

.verdict {
  display: flex; align-items: center; gap: 9px;
  font-size: 15.5px; font-weight: 800; letter-spacing: .5px;
  margin: 16px 0 10px; animation: pop .32s var(--spring);
}
@keyframes pop { from { opacity: 0; transform: translateY(-6px) scale(.96); } to { opacity: 1; transform: none; } }
.verdict.ok { color: var(--ok); }
.verdict.no { color: var(--no); }
.verdict .mark {
  width: 26px; height: 26px; border-radius: 50%; color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 15px; flex: none;
}
.verdict.ok .mark { background: var(--ok); }
.verdict.no .mark { background: var(--no); }

.explain {
  background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--primary-soft);
  border-radius: var(--r-sm); padding: 13px 15px; margin-bottom: 12px;
  font-size: 14.5px; line-height: 1.85; color: var(--ink-soft);
  animation: pop .34s var(--spring);
}
.explain .eh { font-size: 12px; font-weight: 800; color: var(--primary); letter-spacing: 1px; margin-bottom: 5px; }
.explain .pt { font-size: 12.5px; color: var(--ink-dim); margin-top: 7px; }

/* 結算 */
.result { text-align: center; padding: 12px 4px 4px; animation: rise .5s var(--ease) both; }
.result-ring {
  width: 148px; height: 148px; margin: 8px auto 18px; position: relative;
  display: flex; align-items: center; justify-content: center;
}
.result-ring svg { position: absolute; inset: 0; width: 100%; height: 100%; transform: rotate(-90deg); }
.result-ring .track { fill: none; stroke: var(--tint-deep); stroke-width: 11; }
.result-ring .bar {
  fill: none; stroke: url(#ringGrad); stroke-width: 11; stroke-linecap: round;
  transition: stroke-dashoffset 1.1s var(--ease);
}
.result-pct { font-size: 40px; font-weight: 850; color: var(--primary-dark); line-height: 1; letter-spacing: -1px; }
.result-pct small { font-size: 17px; font-weight: 700; }
.result-lead { font-size: 17px; font-weight: 750; color: var(--ink); margin-bottom: 4px; }
.result-sub { font-size: 13.5px; color: var(--ink-dim); margin-bottom: 20px; }
.result-grid { display: flex; gap: 10px; margin-bottom: 20px; }
.rg-item {
  flex: 1; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-sm); padding: 12px 6px; box-shadow: var(--sh-xs);
}
.rg-num { font-size: 22px; font-weight: 850; color: var(--ink); line-height: 1.2; font-variant-numeric: tabular-nums; }
.rg-num.ok { color: var(--ok); }
.rg-num.no { color: var(--no); }
.rg-lab { font-size: 11.5px; color: var(--ink-dim); font-weight: 650; letter-spacing: .5px; }

.review-item {
  text-align: left; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-sm); padding: 13px 15px; margin-bottom: 9px; box-shadow: var(--sh-xs);
}
.review-item .ri-q { font-size: 14.5px; font-weight: 650; line-height: 1.7; color: var(--ink); margin-bottom: 7px; }
.review-item .ri-a { font-size: 13px; line-height: 1.7; }
.review-item .ri-a b { color: var(--ok); }
.review-item .ri-a i { color: var(--no); font-style: normal; }
.review-item .ri-e { font-size: 13px; line-height: 1.75; color: var(--ink-soft); margin-top: 7px; padding-top: 7px; border-top: 1px dashed var(--line); }

/* ══ 成績 ══════════════════════════════════ */
.stat-row { display: flex; gap: 10px; margin-bottom: 18px; }
.stat-tile {
  flex: 1; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  padding: 14px 8px; text-align: center; box-shadow: var(--sh-sm);
}
.stat-num { font-size: 24px; font-weight: 850; color: var(--primary-dark); line-height: 1.15; font-variant-numeric: tabular-nums; }
.stat-lab { font-size: 11.5px; color: var(--ink-dim); font-weight: 650; letter-spacing: .5px; margin-top: 2px; }

.bar-row { margin-bottom: 14px; }
.bar-top { display: flex; justify-content: space-between; align-items: baseline; font-size: 13.5px; margin-bottom: 6px; }
.bar-top .bn { font-weight: 700; color: var(--ink); }
.bar-top .bv { font-weight: 800; color: var(--primary); font-variant-numeric: tabular-nums; }
.bar-top .bv.dim { color: var(--ink-dim); font-weight: 600; }
.bar-track { height: 8px; background: var(--tint-deep); border-radius: 999px; overflow: hidden; }
.bar-fill {
  height: 100%; border-radius: 999px; width: 0;
  background: linear-gradient(90deg, var(--primary-soft) 0%, var(--primary) 100%);
  transition: width .9s var(--ease);
}
.bar-fill.warn { background: linear-gradient(90deg, #E0A458 0%, #C4802F 100%); }

.log-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 12px 14px; margin-bottom: 8px; box-shadow: var(--sh-xs);
}
.log-main { flex: 1; min-width: 0; }
.log-name { font-size: 14.5px; font-weight: 700; color: var(--ink); line-height: 1.4; }
.log-when { font-size: 11.5px; color: var(--ink-dim); margin-top: 1px; }
.log-score { font-size: 16px; font-weight: 850; color: var(--primary); flex: none; font-variant-numeric: tabular-nums; }

/* ══ 底部分頁 ══════════════════════════════ */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 60;
  max-width: 480px; margin: 0 auto;
  height: calc(var(--tabh) + var(--safe-bot)); padding-bottom: var(--safe-bot);
  display: flex; background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-top: 1px solid var(--line);
}
.tab {
  flex: 1; border: 0; background: transparent; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  color: var(--ink-dim); font-size: 11px; font-weight: 700; letter-spacing: .5px;
  transition: color .2s var(--ease);
}
.tab svg { width: 22px; height: 22px; transition: transform .28s var(--spring); }
.tab.on { color: var(--primary); }
.tab.on svg { transform: translateY(-1px) scale(1.06); }
.tab:active svg { transform: scale(.9); }
.tab[hidden] { display: none; }

/* ══ Modal ═════════════════════════════════ */
.modal-mask {
  position: fixed; inset: 0; z-index: 150;
  display: flex; align-items: flex-end; justify-content: center;
  background: rgba(17,24,39,.34);
  backdrop-filter: blur(7px); -webkit-backdrop-filter: blur(7px);
  padding: 16px; opacity: 0; transition: opacity .26s var(--ease);
}
.modal-mask.show { opacity: 1; }
.modal-mask[hidden] { display: none; }
.modal-card {
  width: 100%; max-width: 448px;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(20px) saturate(170%); -webkit-backdrop-filter: blur(20px) saturate(170%);
  border: 1px solid rgba(255,255,255,.65); border-radius: 24px;
  box-shadow: var(--sh-lg); padding: 12px 20px 20px;
  transform: translateY(26px) scale(.97); opacity: 0;
  transition: transform .36s var(--spring), opacity .28s var(--ease);
}
.modal-mask.show .modal-card { transform: none; opacity: 1; }
.grabber { width: 40px; height: 5px; background: var(--ink-dim); opacity: .38; border-radius: 999px; margin: 4px auto 14px; }
.modal-scroll { overflow-y: auto; -webkit-overflow-scrolling: touch; }
.modal-close {
  margin-top: 16px; width: 100%; min-height: 48px; border: 0; border-radius: var(--r-sm);
  background: var(--primary); color: #fff; font-size: 16px; font-weight: 700; cursor: pointer;
}
.modal-close:active { background: var(--primary-dark); }

/* 觀念題卡 */
.essay-card { max-height: 84vh; display: flex; flex-direction: column; }
.essay-q { font-size: 16px; font-weight: 700; line-height: 1.8; color: var(--ink); margin-bottom: 14px; }
.essay-sec { margin-bottom: 14px; }
.essay-h {
  display: inline-block; font-size: 11.5px; font-weight: 800; letter-spacing: 1px;
  color: #fff; background: var(--primary); border-radius: 999px; padding: 3px 11px; margin-bottom: 8px;
}
.essay-h.gold { background: var(--gold-dark); }
.essay-h.dim { background: var(--ink-dim); }
.essay-t { font-size: 14.5px; line-height: 1.9; color: var(--ink-soft); white-space: pre-wrap; }

/* 鎖頭卡 */
.lock-mask { align-items: center; }
.lock-card { padding: 10px 22px 18px; max-height: 86vh; display: flex; flex-direction: column; }
#lockBody { text-align: center; }
.lock-emoji { font-size: 48px; margin: 2px 0 6px; filter: drop-shadow(0 6px 14px rgba(166,124,82,.35)); animation: lockPop .42s var(--spring); }
@keyframes lockPop { from { transform: scale(.6); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.lock-title { font-size: 19px; font-weight: 800; margin: 4px 0 8px; color: var(--ink); }
.lock-text { font-size: 15px; color: var(--ink-soft); line-height: 1.75; margin: 0 0 2px; }
.lock-divider {
  display: flex; align-items: center; gap: 10px; font-size: 12px; font-weight: 800;
  letter-spacing: 1px; color: var(--ink-dim); margin: 18px 0 12px;
}
.lock-divider::before, .lock-divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.pitch-heading { font-size: 15px; font-weight: 800; color: var(--primary-dark); margin: 0 0 14px; line-height: 1.55; }
.pitch-group-label {
  text-align: left; font-size: 13px; font-weight: 800; color: var(--primary);
  margin: 4px 0 8px; padding-left: 9px; border-left: 3px solid var(--primary); line-height: 1.3;
}
.pitch-list { text-align: left; margin-bottom: 14px; }
.pitch-item { display: flex; gap: 10px; padding: 10px 12px; margin-bottom: 8px; background: var(--tint); border-radius: var(--r-sm); }
.pitch-icon { font-size: 18px; flex: none; line-height: 1.5; }
.pitch-body { font-size: 13.5px; line-height: 1.65; color: var(--ink-soft); }
.pitch-body b { display: block; color: var(--ink); font-size: 14px; margin-bottom: 1px; }
.lock-line-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; min-height: 50px; padding: 8px 16px; border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; font-size: 15.5px; font-weight: 700; text-decoration: none; cursor: pointer;
  box-shadow: 0 8px 22px rgba(47,74,97,.36);
}
.lock-line-btn svg { width: 20px; height: 20px; flex: none; }
.lock-line-btn:active { transform: scale(.98); }
.lock-dismiss {
  width: 100%; min-height: 44px; margin-top: 10px; border: 0; background: transparent;
  color: var(--ink-dim); font-size: 15px; font-weight: 650; cursor: pointer;
}

/* QR 卡 */
.qr-mask { align-items: center; }
.qr-card { padding: 10px 20px 18px; text-align: center; background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; max-width: 380px; }
.qr-eyebrow { font-size: 11.5px; font-weight: 700; letter-spacing: 1.4px; color: var(--ink-dim); margin-top: 2px; }
.qr-title { font-size: 18px; font-weight: 800; color: var(--ink); margin: 6px 0 14px; line-height: 1.4; }
.qr-frame { background: #fff; border: 1px solid var(--line); border-radius: var(--r-sm); padding: 10px; margin: 0 auto 12px; max-width: 324px; box-shadow: var(--sh-xs); }
.qr-img { display: block; width: 100%; height: auto; border-radius: 6px; image-rendering: -webkit-optimize-contrast; -webkit-user-drag: none; user-select: none; }
.qr-hint { font-size: 12.5px; line-height: 1.65; color: var(--ink-soft); margin: 0 0 14px; }
.qr-open-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; min-height: 48px; padding: 8px 16px; border-radius: var(--r-sm);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff; font-size: 15px; font-weight: 700; text-decoration: none;
  box-shadow: 0 8px 22px rgba(47,74,97,.32);
}
.qr-open-btn svg { width: 19px; height: 19px; flex: none; }
.qr-open-btn:active { transform: scale(.98); }
.qr-close { width: 100%; min-height: 42px; margin-top: 8px; border: none; background: transparent; color: var(--ink-dim); font-size: 14px; font-weight: 650; cursor: pointer; }

/* ══ Footer ════════════════════════════════ */
.foot { text-align: center; font-size: 12px; color: var(--ink-dim); padding: 24px 16px 30px; letter-spacing: .5px; }
.foot-dim { opacity: .7; }
.foot-inquiry {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-height: 42px; padding: 8px 18px; margin-bottom: 16px;
  border: 1px solid rgba(47,74,97,.28); border-radius: 999px;
  background: var(--surface); color: var(--primary); font-size: 13px; font-weight: 700;
  text-decoration: none; box-shadow: var(--sh-xs);
  transition: background .18s var(--ease), border-color .18s var(--ease), transform .14s var(--ease);
}
.foot-inquiry .foot-inquiry-icon { font-size: 15px; }
.foot-inquiry svg { width: 15px; height: 15px; opacity: .8; }
.foot-inquiry:active { transform: scale(.98); }
@media (hover: hover) { .foot-inquiry:hover { background: var(--tint); border-color: var(--primary); } }
.foot-credit { line-height: 1.7; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* ══════════════════════════════════════════
   啟用碼閘門（由 data.json → brand.gate 開關）
   B2B 補習班版不設定 gate，這段樣式就不會被用到。
   ══════════════════════════════════════════ */
.gate {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  padding: 24px calc(24px + env(safe-area-inset-left, 0px));
  background: linear-gradient(160deg, var(--primary-dark), var(--primary) 60%, #16242F);
}
.gate-card {
  width: 100%; max-width: 360px;
  background: var(--surface);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  padding: 32px 24px 26px;
  text-align: center;
  animation: gateIn .42s var(--spring) both;
}
@keyframes gateIn { from { opacity: 0; transform: translateY(14px) scale(.97); } }
.gate-title {
  font-size: 20px; font-weight: 800; letter-spacing: .02em;
  color: var(--primary-dark); margin-bottom: 8px;
}
.gate-title::after {
  content: ''; display: block; width: 34px; height: 3px; border-radius: 2px;
  background: var(--gold); margin: 12px auto 0;
}
.gate-hint {
  font-size: 13.5px; color: var(--ink-soft); line-height: 1.65;
  margin: 16px 0 20px;
}
.gate-input {
  width: 100%; height: 50px;
  border: 1.5px solid var(--line); border-radius: var(--r-sm);
  background: var(--bg); color: var(--ink);
  font-size: 17px; font-weight: 700; letter-spacing: .16em; text-align: center;
  font-family: inherit;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.gate-input:focus {
  outline: none; border-color: var(--primary-soft); background: var(--surface);
}
.gate-input::placeholder { letter-spacing: .04em; font-weight: 500; color: var(--ink-dim); }
.gate-btn {
  width: 100%; height: 48px; margin-top: 12px;
  border: 0; border-radius: var(--r-sm); cursor: pointer;
  background: var(--primary); color: #fff;
  font-size: 16px; font-weight: 700; font-family: inherit; letter-spacing: .04em;
  transition: background .18s var(--ease), transform .12s var(--ease);
}
.gate-btn:hover { background: var(--primary-dark); }
.gate-btn:active { transform: scale(.985); }
.gate-err {
  margin-top: 14px; font-size: 13px; font-weight: 600; color: var(--no);
  background: var(--no-bg); border: 1px solid var(--no-line);
  border-radius: var(--r-sm); padding: 9px 12px;
}

/* ══════════════════════════════════════════
   左側科目選單（單元帶 group 才啟用）
   ══════════════════════════════════════════ */
.nav-btn {
  flex: none; display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; margin-right: 4px; padding: 0;
  border: 0; border-radius: 8px; cursor: pointer;
  background: rgba(255,255,255,.10); color: #fff;
  transition: background .18s var(--ease);
}
/* 🔴 2026-09-09：.nav-btn 有自己的 display，[hidden] 預設的 display:none 蓋不過它。
   沒有這一行的話，程式判斷「沒有選單內容」把按鈕 hidden 之後，
   按鈕還是留在畫面上——變成一顆點了沒反應的裝飾品。 */
.nav-btn[hidden] { display: none !important; }
.nav-btn svg { width: 18px; height: 18px; }
.nav-btn:hover { background: rgba(255,255,255,.20); }
.nav-btn:active { transform: scale(.94); }

.drawer-mask {
  position: fixed; inset: 0; z-index: 900;
  background: rgba(17,24,39,.45);
  opacity: 0; pointer-events: none;
  transition: opacity .26s var(--ease);
}
.drawer-mask.show { opacity: 1; pointer-events: auto; }

.drawer {
  position: fixed; z-index: 901;
  top: 0; left: 0; bottom: 0;
  width: min(78vw, 300px);
  display: flex; flex-direction: column;
  background: var(--surface);
  box-shadow: var(--sh-lg);
  transform: translateX(-100%);
  transition: transform .3s var(--ease);
  padding-top: var(--safe-top);
  padding-left: env(safe-area-inset-left, 0px);
}
.drawer.open { transform: none; }

.drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 16px 14px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--primary); color: #fff;
}
.drawer-title { font-size: 16px; font-weight: 800; letter-spacing: .08em; }
.drawer-close {
  border: 0; background: transparent; color: #fff;
  font-size: 26px; line-height: 1; cursor: pointer; padding: 0 4px;
  opacity: .8; transition: opacity .18s var(--ease);
}
.drawer-close:hover { opacity: 1; }

.drawer-list {
  flex: 1; overflow-y: auto;
  padding: 10px 12px calc(16px + var(--safe-bot));
  -webkit-overflow-scrolling: touch;
}
.drawer-row { margin-bottom: 4px; }
.drawer-item {
  display: flex; align-items: center; gap: 8px;
  width: 100%; text-align: left;
  padding: 13px 14px;
  border: 1px solid transparent; border-radius: var(--r-sm);
  background: transparent; cursor: pointer; font-family: inherit;
  transition: background .16s var(--ease), border-color .16s var(--ease);
}
.drawer-item:hover { background: var(--tint); }
.drawer-item.on { background: var(--tint); border-color: var(--tint-deep); }
.drawer-item.on .di-name { color: var(--primary-dark); }
.drawer-item.on .di-name::before {
  content: ''; display: inline-block; vertical-align: middle;
  width: 3px; height: 14px; border-radius: 2px;
  background: var(--gold); margin-right: 8px;
}
.di-main { flex: 1; min-width: 0; }
.di-name {
  display: block; font-size: 15.5px; font-weight: 700; color: var(--ink);
  margin-bottom: 3px;
}
.di-meta { display: block; font-size: 12px; color: var(--ink-dim); letter-spacing: .02em; }
.di-chev {
  flex: none; width: 17px; height: 17px; color: var(--ink-dim);
  transition: transform .26s var(--ease);
}
.drawer-row.open > .drawer-item .di-chev { transform: rotate(90deg); }

/* 子層：預設收合，父層 .open 才展開 */
.drawer-sub {
  display: grid; grid-template-rows: 0fr;
  transition: grid-template-rows .28s var(--ease);
  padding-left: 12px;
}
.drawer-sub-inner { overflow: hidden; min-height: 0; }
.drawer-row.open > .drawer-sub { grid-template-rows: 1fr; }
.drawer-item.sub { padding: 11px 12px; }
.drawer-item.sub .di-name { font-size: 14.5px; font-weight: 600; }
.drawer-row.sub { position: relative; margin-bottom: 2px; }
.drawer-row.sub::before {
  content: ''; position: absolute; left: 0; top: 6px; bottom: 6px;
  width: 2px; border-radius: 1px; background: var(--line);
}

/* 非科目項目（讀書方法、關於我們…）的內容卡 */
.info-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r); box-shadow: var(--sh-xs);
  padding: 20px 18px; margin-top: 4px;
}
.info-card p { margin: 0 0 10px; font-size: 15px; line-height: 1.85; color: var(--ink-soft); }
.info-card p:last-child { margin-bottom: 0; }

/* 題目附圖：一律用原卷圖檔，不重製 */
.q-fig {
  margin: 0 0 14px;
  border: 1px solid var(--line); border-radius: var(--r-sm);
  background: #fff; overflow: hidden;
}
/* 高度上限：社會科的地圖題原圖是直式的，不設限會一張圖佔滿整個手機螢幕，
   學生得捲很久才看得到選項。設上限後圖會縮到看得完，要看細節可以雙指放大。 */
.q-fig img { display: block; width: 100%; height: auto; max-height: 58vh; object-fit: contain; }

/* 練習題 →「翻到講義這一段」按鈕，以及跳過去後的高亮 */
.goto-entry {
  display: inline-block; margin-top: 10px;
  padding: 9px 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--tint-deep); background: var(--tint);
  color: var(--primary); font-family: inherit;
  font-size: 13.5px; font-weight: 700; letter-spacing: .02em;
  transition: background .18s var(--ease), transform .12s var(--ease);
}
.goto-entry:hover { background: var(--tint-deep); }
.goto-entry:active { transform: scale(.97); }

.entry.flash { animation: entryFlash 1.6s var(--ease); }
@keyframes entryFlash {
  0%, 100% { background: transparent; }
  15%, 60% { background: rgba(196,163,111,.16); }
}

/* 單元提醒（例如地理專區「沒有講義可對照」） */
.notice {
  margin: 0 0 12px;
  padding: 12px 14px;
  border: 1px solid var(--gold);
  border-left-width: 3px;
  border-radius: var(--r-sm);
  background: #FFF4EE;
  color: var(--ink-soft);
  font-size: 13.5px; line-height: 1.75;
}

/* 試讀版：鎖頭彈窗裡的行動呼籲按鈕 */
.lock-cta {
  display: block; margin: 18px auto 8px; max-width: 300px;
  padding: 15px 22px; border-radius: 999px;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: #fff; text-align: center; text-decoration: none;
  font-size: 16.5px; font-weight: 800; letter-spacing: .06em;
  box-shadow: 0 8px 22px rgba(196,163,111,.42);
  transition: transform .14s var(--ease), box-shadow .18s var(--ease);
}
.lock-cta:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(196,163,111,.5); }
.lock-cta:active { transform: scale(.98); }
.lock-cta-note {
  text-align: center; font-size: 12.5px; color: var(--ink-dim);
  margin-bottom: 6px; letter-spacing: .02em;
}

/* 鎖頭彈窗裡的摺疊區塊（brand.lock.sections）——「為什麼值得買／怎麼購買」。
   刻意收合：買家點鎖頭是想知道「這章有什麼」，主線是上面那顆 CTA。
   這兩段是給願意多讀一點的人，展開才出現，不搶主線。 */
.lock-acc {
  margin: 10px 0 0; border-top: 1px solid var(--line);
}
.lock-acc:last-of-type { border-bottom: 1px solid var(--line); }
.lock-acc-sum {
  cursor: pointer; list-style: none; padding: 13px 26px 13px 2px;
  font-size: 14.5px; font-weight: 700; color: var(--ink);
  position: relative; letter-spacing: .02em;
}
.lock-acc-sum::-webkit-details-marker { display: none; }
/* 自己畫箭頭，展開時轉 180 度 */
.lock-acc-sum::after {
  content: ""; position: absolute; right: 6px; top: 50%;
  width: 8px; height: 8px; margin-top: -6px;
  border-right: 2px solid var(--ink-dim); border-bottom: 2px solid var(--ink-dim);
  transform: rotate(45deg); transition: transform .18s var(--ease);
}
.lock-acc[open] > .lock-acc-sum::after { transform: rotate(-135deg); margin-top: -2px; }
.lock-acc-body {
  padding: 0 2px 15px; font-size: 14px; line-height: 1.85;
  color: var(--ink-soft); text-align: left;
}

/* 試讀版：查不到時的補充說明（把死路變成銷售點） */
.empty-note {
  margin: 16px auto 0; max-width: 300px;
  padding: 12px 14px; border-radius: var(--r-sm);
  background: #FFF4EE; border: 1px solid var(--gold);
  color: var(--ink-soft); font-size: 13px; line-height: 1.75;
}

/* ══ 打字填空題（q.type === 'fill'）════════════
   英文動詞變化題保留「用打字的」，因為那一題的教學目的
   就是練拼寫。手機鍵盤會自動大寫與自動修正，所以 input
   上關掉 autocapitalize／autocorrect，比對時再做一次容錯。 */
.fill-wrap {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px;
}
.fill-input {
  flex: 1 1 180px; min-width: 0;
  padding: 14px 16px;
  font-size: 17px; font-weight: 650; letter-spacing: .3px;
  color: var(--ink); background: var(--surface);
  border: 2px solid var(--line); border-radius: var(--r-sm);
  outline: none; transition: border-color .18s var(--ease), background .18s var(--ease);
  font-family: inherit;
}
.fill-input::placeholder { color: var(--ink-dim); font-weight: 500; letter-spacing: 0; }
.fill-input:focus { border-color: var(--primary-soft); }
.fill-input.correct {
  border-color: var(--ok-line); background: var(--ok-bg); color: var(--ok);
}
.fill-input.wrong {
  border-color: var(--no-line); background: var(--no-bg); color: var(--no);
}
.fill-input:disabled { opacity: 1; -webkit-text-fill-color: currentColor; }

.fill-send {
  flex: 0 0 auto; padding: 14px 24px;
  font-size: 16px; font-weight: 700; font-family: inherit;
  color: #fff; background: var(--primary);
  border: 0; border-radius: var(--r-sm); cursor: pointer;
  transition: transform .16s var(--ease), background .18s var(--ease);
}
.fill-send:active { transform: scale(.97); }
.fill-send:disabled { background: var(--ink-dim); cursor: default; transform: none; }

.fill-truth {
  flex: 1 0 100%;
  padding: 10px 14px; border-radius: var(--r-sm);
  background: var(--tint); color: var(--ink-soft);
  font-size: 15px; line-height: 1.6;
}
.fill-truth b { color: var(--primary); font-weight: 800; letter-spacing: .3px; }

/* 題幹保留換行：雙語講義的中文語意放在英文題幹下一行，
   沒有 pre-line 的話兩行會擠成一行。 */
.q-stem { white-space: pre-line; }

/* 封面「點擊進入」在 data 載入完成前的狀態。
   ⚠️ 這顆按鈕在 index.html 的靜態骨架裡，開頁就看得到，
   但事件要等 data 載完才綁 —— 沒有這個狀態的話，
   使用者會按了沒反應、然後畫面自己跳進去。 */
.cover-enter.loading {
  opacity: .55;
  cursor: default;
  pointer-events: none;
}
.cover-enter.loading svg { opacity: .4; }
.cover-enter.loading #coverEnterText {
  animation: coverPulse 1.1s ease-in-out infinite;
}
@keyframes coverPulse { 0%,100% { opacity: .75; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .cover-enter.loading #coverEnterText { animation: none; }
}

/* ── 拉簾底部的招商說明（2026-08-27）───────────────
   展示車拿掉鎖頭後，原本只在鎖頭彈窗出現的招商內容搬到這裡。
   拉簾比彈窗窄，所以縮字級、收邊距。 */
.drawer-pitch { padding: 4px 14px 22px; }
.drawer-pitch .lock-divider { margin: 18px 0 14px; }
.drawer-pitch .pitch-heading { font-size: 14px; margin-bottom: 12px; }
.drawer-pitch .pitch-item { padding: 9px 10px; gap: 8px; }
.drawer-pitch .pitch-body { font-size: 12.5px; line-height: 1.6; }
.drawer-pitch .lock-line-btn { margin-top: 14px; }

/* ── 消除「載入前先閃一下舊內容」（2026-08-27）─────────────────
   問題：index.html 為了在編輯器裡看得到東西，把封面副標、頁尾等
   寫死了預設值（例如「運動行銷學」「Demo 展示版」）。
   但實際流程是 HTML 先畫出來 → 才 fetch data.json → applyBrand() 才蓋掉，
   那個 fetch 的空檔使用者就會看到舊內容閃一下。

   解法：由 <head> 的內嵌 script 立刻在 <html> 掛上 .brand-pending，
   把「會被 data.json 覆寫」的文字設成 visibility:hidden（不是 display:none，
   所以版面高度不變、不會跳動），applyBrand() 跑完再拿掉。
   ⚠️ 只隱藏文字節點，按鈕與版面照常，載入失敗時 script.js 也會拿掉這個 class。 */
.brand-pending #coverTitle,
.brand-pending #coverSub,
.brand-pending .cover-feat,
.brand-pending #cobrandSystem,
.brand-pending #footSystem,
.brand-pending #footNote { visibility: hidden; }