/* iPAS 淨零碳（初級）讀書工具 */
:root {
  --bg: #f6f7f5;
  --card: #ffffff;
  --ink: #1e2a24;
  --muted: #64716a;
  --line: #dde3df;
  --brand: #1a7a4f;
  --brand-soft: #e5f3ec;
  --accent: #0f5c8c;
  --wrong: #c0392b;
  --wrong-soft: #fdecea;
  --right: #1e8e3e;
  --right-soft: #e6f4ea;
  --warn: #b7791f;
  --warn-soft: #fdf3e3;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(20, 40, 30, 0.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft JhengHei", "PingFang TC", "Noto Sans TC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
a { color: var(--accent); }

/* ── 版面 ── */
header.topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; gap: 4px;
  padding: 0 12px;
  overflow-x: auto;
  white-space: nowrap;
}
.topbar .logo {
  font-weight: 700; color: var(--brand);
  padding: 12px 10px 12px 2px; font-size: 15px;
  flex: 0 0 auto;
}
.topbar nav { display: flex; gap: 2px; }
.topbar nav a {
  display: inline-block; padding: 12px 11px;
  color: var(--muted); text-decoration: none; font-size: 15px;
  border-bottom: 2.5px solid transparent;
}
.topbar nav a.active { color: var(--brand); border-bottom-color: var(--brand); font-weight: 600; }
.topbar nav a:hover { color: var(--ink); }
/* 公開版：設定收成齒輪圖示（applyPublicChrome 會加上這個 class） */
.topbar nav a.gear { font-size: 18px; padding: 10px 10px; line-height: 1.4; }

/* 公開版：首次開站的引導卡 */
.intro-card { border-left: 4px solid var(--brand); }
.intro-card h2 { margin-top: 0; }
.intro-card .intro-list { margin: 10px 0 12px; padding-left: 20px; }
.intro-card .intro-list li { margin: 4px 0; }

main { max-width: 860px; margin: 0 auto; padding: 20px 14px 90px; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 18px 20px; margin-bottom: 16px;
}
.card h2 { margin: 0 0 10px; font-size: 19px; }
.card h3 { margin: 16px 0 8px; font-size: 16px; color: var(--brand); }
.muted { color: var(--muted); font-size: 13.5px; }
.small { font-size: 13px; }

table.simple { border-collapse: collapse; width: 100%; font-size: 14.5px; }
table.simple th, table.simple td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
table.simple th { background: var(--brand-soft); }

/* ── 按鈕 ── */
button, .btn {
  font-family: inherit; font-size: 15px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--card); color: var(--ink);
  padding: 9px 16px; cursor: pointer;
}
button:hover { border-color: var(--brand); }
button.primary { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }
button.primary:hover { filter: brightness(1.08); }
button.danger { color: var(--wrong); border-color: var(--wrong); background: var(--card); }
button.ghost { border-color: transparent; color: var(--accent); background: transparent; }
button:disabled { opacity: 0.45; cursor: default; }
.btnrow { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

/* ── 首頁 ── */
.hero {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: stretch;
}
.hero .big {
  flex: 1 1 240px;
  background: linear-gradient(135deg, var(--brand) 0%, #135e3c 100%);
  color: #fff; border-radius: var(--radius); padding: 20px 22px;
}
.hero .big .days { font-size: 44px; font-weight: 800; line-height: 1.1; }
.hero .big .sub { opacity: 0.92; font-size: 14px; margin-top: 4px; }
.statgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-top: 14px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 13px 15px; }
.stat .n { font-size: 26px; font-weight: 700; color: var(--brand); }
.stat .n.warn { color: var(--wrong); }
.stat .t { font-size: 13px; color: var(--muted); }

.modegrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.modecard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; cursor: pointer; box-shadow: var(--shadow);
  transition: transform 0.06s ease, border-color 0.06s ease;
}
.modecard:hover { transform: translateY(-2px); border-color: var(--brand); }
.modecard .ic { font-size: 26px; }
.modecard .name { font-weight: 700; margin-top: 6px; }
.modecard .desc { font-size: 13px; color: var(--muted); margin-top: 3px; }

/* ── 題目 ── */
.quiz-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.quiz-head .prog { font-size: 14px; color: var(--muted); }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 18px; color: var(--brand); }
.timer.low { color: var(--wrong); }

.badge {
  display: inline-block; font-size: 12px; border-radius: 20px;
  padding: 2px 10px; margin-right: 6px; vertical-align: 2px;
}
.badge.official { background: var(--brand-soft); color: var(--brand); }
.badge.ai { background: var(--warn-soft); color: var(--warn); }
.badge.tier { background: #eef1f7; color: #4a5a7a; }
.badge.due { background: var(--wrong-soft); color: var(--wrong); }
.badge.disputed { background: #f3e8ff; color: #7c3aed; }
.badge.unchecked { background: #fef3c7; color: #92400e; }
.badge.gistonly { background: #e0f2fe; color: #0369a1; }
.badge.cat-tw { background: var(--brand-soft); color: var(--brand); }
.badge.cat-intl { background: #e0f2fe; color: #0369a1; }
.badge.cat-std { background: #f3e8ff; color: #7c3aed; }

/* 教材書籍切換鈕（原下拉選單；朋友回饋看不出可以拉，改成一眼可見的並排按鈕） */
.book-tabs { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.book-tabs button { padding: 7px 14px; font-size: 14.5px; }
.book-tabs button.on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }

/* 時事專區過濾列 */
.news-filter { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.news-filter button { padding: 5px 12px; font-size: 14px; }
.news-filter button.on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }
.news-filter input { font-family: inherit; font-size: 14px; border: 1px solid var(--line); border-radius: 9px; padding: 6px 12px; flex: 1 1 160px; min-width: 140px; }

/* 首頁今日建議 */
.sugrow { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 15px; }
.sugrow:last-child { border-bottom: none; }
.sugrow button { flex: 0 0 auto; }

.stem { font-size: 17px; font-weight: 600; margin: 10px 0 14px; white-space: pre-wrap; }
.opts { display: flex; flex-direction: column; gap: 9px; }
.opt {
  text-align: left; padding: 11px 14px; border-radius: 10px;
  border: 1.5px solid var(--line); background: var(--card);
  font-size: 15.5px; line-height: 1.5; cursor: pointer;
  display: flex; gap: 10px;
}
.opt .k { font-weight: 700; color: var(--brand); flex: 0 0 1.4em; }
.opt:hover { border-color: var(--brand); background: var(--brand-soft); }
.opt.picked { border-color: var(--accent); background: #e8f1f8; }
.opt.correct { border-color: var(--right); background: var(--right-soft); }
.opt.wrongpick { border-color: var(--wrong); background: var(--wrong-soft); }
.opt.reveal-dim { opacity: 0.75; }
.opt:disabled { cursor: default; }

.feedback { border-radius: 10px; padding: 12px 15px; margin-top: 14px; font-size: 15px; }
.feedback.ok { background: var(--right-soft); border: 1px solid #bfe3c8; }
.feedback.no { background: var(--wrong-soft); border: 1px solid #f2c4bd; }
.expl { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line); white-space: pre-wrap; }
.srcref { margin-top: 8px; font-size: 13px; color: var(--muted); }

/* 模擬考導航格 */
.qnav { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.qnav button {
  width: 38px; height: 34px; padding: 0; font-size: 13px; border-radius: 7px;
}
.qnav button.answered { background: var(--brand-soft); border-color: var(--brand); color: var(--brand); font-weight: 700; }
.qnav button.flagged { box-shadow: inset 0 -3px 0 var(--warn); }
.qnav button.cur { outline: 2.5px solid var(--accent); }
.qnav button.navright { background: var(--right-soft); border-color: var(--right); color: var(--right); }
.qnav button.navwrong { background: var(--wrong-soft); border-color: var(--wrong); color: var(--wrong); }

.scorebox { text-align: center; padding: 26px 10px; }
.scorebox .score { font-size: 56px; font-weight: 800; }
.scorebox .pass { color: var(--right); }
.scorebox .fail { color: var(--wrong); }

/* 盲答 */
.blind-input {
  width: 100%; font-family: inherit; font-size: 15px;
  border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px;
  min-height: 64px; resize: vertical; background: var(--card); color: var(--ink);
}

/* 篩選列 */
.filters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
.filters select, .filters input[type="number"] {
  font-family: inherit; font-size: 14.5px; padding: 7px 9px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink);
}
.chip { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }

/* 錯題列表 */
.wrongitem { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; background: var(--card); }
.wrongitem .q { font-weight: 600; }
.wrongitem .meta { font-size: 12.5px; color: var(--muted); margin-top: 4px; }

/* 進度條 */
.bar { height: 8px; background: var(--line); border-radius: 6px; overflow: hidden; margin-top: 6px; }
.bar > div { height: 100%; background: var(--brand); }

/* ── 教材閱讀 ── */
.read-layout { display: flex; gap: 16px; align-items: flex-start; }
.toc {
  flex: 0 0 250px; overflow-y: auto;
  position: sticky; top: 64px; padding: 12px 14px;
  /* 從 sticky 起點 64px 一路撐到視窗底部（留 12px 白邊）；dvh 讓行動列伸縮時跟著變 */
  max-height: calc(100vh - 76px);
  max-height: calc(100dvh - 76px);
}
.toc-ch { font-weight: 700; color: var(--brand); margin: 10px 0 4px; font-size: 14px; }
.toc-sec {
  display: block; padding: 4px 8px; font-size: 13.5px; color: var(--muted);
  text-decoration: none; border-radius: 6px; line-height: 1.4;
}
.toc-sec:hover { background: var(--brand-soft); color: var(--ink); }
.toc-sec.cur { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.read-main { flex: 1; min-width: 0; }
.book-html { font-size: 15.5px; line-height: 1.9; } /* 字級由教材頁 A−/A＋ 設定覆寫 */
.book-html, .guide-body { overflow-wrap: anywhere; } /* 參考文獻的長網址在手機寬度會把整欄撐開（2026-08-29 實測 390px），允許在任意處斷行 */
.book-html p { margin: 0.8em 0; text-indent: 2em; } /* 首行縮排兩全形字（作文式） */
.book-html .quiz-note, .book-html .fig-note { text-indent: 0; } /* 提示框不縮排 */
.book-html h4 { margin: 1.2em 0 0.4em; color: var(--accent); font-size: 1.02em; }
.book-html ul, .book-html ol { padding-left: 1.6em; }
.book-html li { margin: 0.25em 0; }
.book-html table { border-collapse: collapse; margin: 0.8em 0; font-size: 14px; display: block; overflow-x: auto; }
.book-html th, .book-html td { border: 1px solid var(--line); padding: 6px 9px; }
.book-html th { background: var(--brand-soft); }
.book-html .quiz-note { background: var(--warn-soft); border-radius: 8px; padding: 8px 12px; font-size: 14px; }
.book-html .fig-note { background: #eef1f7; border-radius: 8px; padding: 8px 12px; font-size: 13.5px; color: #4a5a7a; }
@media (max-width: 760px) {
  .read-layout { flex-direction: column; }
  .toc { position: static; flex: none; width: 100%; max-height: 240px; }
}

/* ── 教材閱讀強化 ── */
main.read-wide { max-width: 1040px; } /* 教材頁單獨放寬（全站其他頁維持 860px） */
/* 宋體：裝置有裝就用本機字型，沒裝則下載教材字元子集（tools/build_font.py，544KB） */
@font-face {
  font-family: "Noto Serif TC";
  src: local("Noto Serif TC"), url("fonts/NotoSerifTC-sub.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}
main.serif .book-html {
  font-family: "Noto Serif TC", "Source Han Serif TC", "Noto Serif CJK TC", serif;
}
body.sepia { background: #f3ead7; } /* 護眼紙色 */
body.sepia .card, body.sepia .pdf-panel { background: #fbf6e9; }
body.sepia .book-html th { background: #efe4c9; }
.toc-prog { margin-bottom: 8px; }
.toc-sec.done:not(.cur) { color: var(--brand); opacity: 0.85; }
.read-top .chip label { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; font-size: 14px; }
.book-html h4 { padding-left: 8px; border-left: 3px solid var(--accent); margin: 1.4em 0 0.5em; }
.book-html tr:nth-child(even) td { background: rgba(26, 122, 79, 0.04); }
.sec-drill { scroll-margin-top: 64px; margin-top: 4px; } /* 節內練習區塊：捲動定位避開 sticky topbar */

/* ── 題卡收藏星號 ── */
.qcard .qhead { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.qcard .star {
  margin-left: auto; border: none; background: transparent;
  font-size: 19px; padding: 0 4px; cursor: pointer; line-height: 1;
}
.qcard .star:hover { transform: scale(1.15); border: none; }

/* ── 戰況：近 7 天活動長條圖 ── */
.chart { display: flex; gap: 8px; align-items: stretch; height: 132px; margin-top: 6px; }
.chart-day { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.chart-day .bars { flex: 1; display: flex; align-items: flex-end; justify-content: center; gap: 3px; }
.chart-day .bar { width: 16px; max-width: 40%; border-radius: 3px 3px 0 0; position: relative; opacity: 0.92; }
.chart-day .bar span {
  position: absolute; top: -15px; left: 50%; transform: translateX(-50%);
  font-size: 10px; color: var(--muted);
}
.chart-lab { text-align: center; font-size: 11px; color: var(--muted); margin-top: 4px; border-top: 1px solid var(--line); padding-top: 3px; }
.chart-legend { display: flex; gap: 14px; margin-top: 8px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.chart-legend .dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; vertical-align: -1px; }
.mtog { padding: 4px 10px; font-size: 13.5px; }
.mtog.on { color: var(--brand); font-weight: 700; background: var(--brand-soft); border-radius: 8px; }

/* ── PDF 右側預覽面板 ── */
.pdf-panel {
  position: fixed; right: 0; bottom: 0; z-index: 60; /* top 由 JS 依 topbar 高度設定 */
  width: var(--pdfw, min(46vw, 880px)); /* 寬度可拖曳調整（read.js），存 localStorage */
  background: var(--card); border-left: 1px solid var(--line);
  box-shadow: -2px 0 10px rgba(20, 40, 30, 0.12);
  display: flex; flex-direction: column;
}
.pdf-drag {
  position: absolute; left: -3px; top: 0; bottom: 0; width: 8px;
  cursor: ew-resize; z-index: 61;
}
.pdf-drag:hover, .pdf-drag.dragging { background: var(--brand-soft); }
.pdf-head {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 10px; border-bottom: 1px solid var(--line);
}
.pdf-title {
  flex: 1; font-size: 13px; color: var(--muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.pdf-head button { padding: 4px 10px; font-size: 13.5px; }
.pdf-panel iframe { flex: 1; border: 0; width: 100%; }
main.pdf-open { margin-right: calc(var(--pdfw, min(46vw, 880px)) + 14px); }
@media (max-width: 900px) {
  .pdf-panel { width: 100vw; }
  .pdf-drag { display: none; } /* 窄螢幕全寬顯示，不提供拖曳 */
  main.pdf-open { margin-right: auto; }
}

/* ── 教材畫記（highlight.js：螢光筆＋備註＋同伴互看） ── */
mark.hl { padding: 0; color: inherit; border-radius: 2px; cursor: pointer; }
mark.hl-y { background: #ffe38f; }
mark.hl-g { background: #b9ecc9; }
mark.hl-b { background: #c3ddff; }
mark.hl-r { background: #ffc9c9; }
mark.hl.has-note::after { content: "📝"; font-size: 0.7em; vertical-align: super; margin: 0 1px; } /* 用 ::after 才不會污染文字節點 offset */
mark.hl-peer { background: transparent; color: inherit; padding: 0; border-bottom: 2px dashed; cursor: pointer; }
mark.hlp-y { border-color: #c99700; background: rgba(255, 227, 143, 0.22); }
mark.hlp-g { border-color: #1e8e3e; background: rgba(185, 236, 201, 0.25); }
mark.hlp-b { border-color: #0f5c8c; background: rgba(195, 221, 255, 0.25); }
mark.hlp-r { border-color: #c0392b; background: rgba(255, 201, 201, 0.25); }
mark.hl-flash { animation: hlflash 0.9s ease 0s 3; }
@keyframes hlflash { 50% { outline: 3px solid var(--accent); outline-offset: 1px; } }
/* 護眼紙色下加深黃色對比、備註底色改暖色 */
body.sepia mark.hl-y { background: #ffd766; }
body.sepia .hl-note-view, body.sepia .hl-item .hl-note { background: #f1e7cf; }

.hl-bar {
  position: absolute; z-index: 70;
  display: flex; gap: 7px; align-items: center;
  background: var(--card); border: 1px solid var(--line); border-radius: 22px;
  padding: 7px 12px; box-shadow: 0 3px 14px rgba(20, 40, 30, 0.2);
}
.hl-dot {
  width: 23px; height: 23px; border-radius: 50%; padding: 0;
  border: 1px solid rgba(0, 0, 0, 0.15); cursor: pointer;
}
.hl-dot:hover { transform: scale(1.18); border-color: rgba(0, 0, 0, 0.3); }
.hl-dot.sel { outline: 2.5px solid var(--accent); outline-offset: 1px; }
.hl-bar .hl-note-btn { border: none; background: transparent; font-size: 18px; padding: 0 2px; cursor: pointer; line-height: 1; }
.hl-bar .hl-note-btn:hover { transform: scale(1.15); border: none; }

.hl-pop {
  position: absolute; z-index: 70;
  width: min(320px, calc(100vw - 24px));
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 14px; box-shadow: 0 6px 24px rgba(20, 40, 30, 0.22);
}
.hl-colors { display: flex; gap: 7px; align-items: center; margin-bottom: 8px; }
.hl-pop textarea {
  width: 100%; font-family: inherit; font-size: 14.5px;
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
  min-height: 64px; resize: vertical; background: var(--card); color: var(--ink);
}
.hl-note-view { background: #eef4fa; border-radius: 8px; padding: 8px 10px; font-size: 14px; white-space: pre-wrap; }

/* 重點總覽頁 */
.hl-sec { font-weight: 700; color: var(--brand); font-size: 14.5px; margin-bottom: 10px; }
.hl-sec .muted { font-weight: 400; margin-left: 4px; }
.hl-item {
  display: flex; gap: 10px; align-items: stretch;
  border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; margin-bottom: 8px; background: var(--card); cursor: pointer;
}
.hl-item:hover { border-color: var(--brand); }
.hl-strip { flex: 0 0 6px; border-radius: 3px; }
.hl-item .hl-txt { font-size: 14.5px; line-height: 1.6; }
.hl-item .hl-note {
  font-size: 13.5px; color: var(--accent); background: #eef4fa;
  border-radius: 6px; padding: 4px 8px; margin-top: 5px; white-space: pre-wrap;
}

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; border-radius: 10px;
  padding: 10px 20px; font-size: 14.5px; z-index: 99; opacity: 0.96;
}
.hidden { display: none !important; }

footer.appfoot { text-align: center; color: var(--muted); font-size: 12.5px; padding: 20px 0 30px; }

/* 概念地圖 */
.cptgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 10px; }
.cpt {
  border: 1px solid var(--line); border-left: 4px solid var(--line);
  border-radius: 10px; padding: 11px 13px; background: var(--card);
  cursor: pointer; transition: border-color 0.15s, transform 0.15s;
}
.cpt:hover { transform: translateY(-2px); border-color: var(--brand); }
.cpt-name { font-weight: 650; font-size: 14.5px; line-height: 1.35; }
.cpt-meta { font-size: 12.5px; color: var(--muted); margin-top: 4px; }
.cpt-off {
  display: inline-block; padding: 1px 6px; border-radius: 6px; font-size: 11.5px; font-weight: 600;
  background: var(--brand-soft); color: var(--brand);
}
.cpt-off.zero { background: #eef0ee; color: #8b968f; }
.cptbar { height: 5px; border-radius: 3px; background: var(--line); margin: 8px 0 5px; overflow: hidden; }
.cptbar i { display: block; height: 100%; background: var(--brand); }
.cpt-acc { font-size: 12.5px; font-weight: 600; color: var(--muted); }
.cpt.none { border-left-color: var(--line); }
.cpt.bad { border-left-color: var(--wrong); }
.cpt.bad .cpt-acc { color: var(--wrong); }
.cpt.bad .cptbar i { background: var(--wrong); }
.cpt.mid { border-left-color: var(--warn); }
.cpt.mid .cpt-acc { color: var(--warn); }
.cpt.mid .cptbar i { background: var(--warn); }
.cpt.good { border-left-color: var(--right); }
.cpt.good .cpt-acc { color: var(--right); }
.cpt.good .cptbar i { background: var(--right); }

@media (max-width: 620px) {
  main { padding: 14px 10px 80px; }
  .card { padding: 14px 14px; }
  .hero .big .days { font-size: 36px; }
  .cptgrid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

/* ── 考前複習（#review） ────────────────────────────── */
main.rv-wide { max-width: 1080px; }
/* 熱度＝命中的官方題數（T1 公告試題＋T2 章末題）。四級配色在關係圖、年表、知識點卡三處共用 */
.rv-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 10px; }
.rv-tabs button { padding: 7px 14px; font-size: 14.5px; text-align: left; line-height: 1.3; }
.rv-tabs button i { display: block; font-style: normal; font-size: 11.5px; font-weight: 400; opacity: 0.72; margin-top: 1px; }

.rv-legend { display: flex; flex-wrap: wrap; gap: 14px; padding-top: 10px; border-top: 1px dashed var(--line); }
.rv-legend .lg { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; }
.rv-legend .lg i { width: 13px; height: 13px; border-radius: 4px; border: 2px solid; display: inline-block; }
.rv-legend .lg em { font-style: normal; font-weight: 400; color: var(--muted); font-size: 12.5px; }
.rv-legend .h-hot i { border-color: #c2410c; background: #ffe4d3; }
.rv-legend .h-warm i { border-color: #b7791f; background: var(--warn-soft); }
.rv-legend .h-mild i { border-color: #64748b; background: #eef2f6; }
.rv-legend .h-none i { border-color: var(--line); background: #fafbfa; }

.rv-intro { background: var(--brand-soft); border-color: #bfe0d0; }
.rv-intro p:first-child { margin-top: 0; }
.rv-intro p:last-child { margin-bottom: 0; }

/* 關係圖：畫布固定 px，窄螢幕橫向捲；SVG 只畫線，節點是絕對定位的 div */
.rv-wrap { overflow-x: auto; padding-bottom: 6px; margin-top: 10px; }
.rv-canvas { position: relative; }
/* 分層底色（bands）：墊在連線與節點底下，用來框出「這幾個節點是同一組」 */
.rv-band {
  position: absolute; box-sizing: border-box; z-index: 0;
  background: #f2f6f4; border: 1px dashed #cfdad4; border-radius: 12px;
}
.rv-band span {
  position: absolute; top: -10px; left: 14px;
  background: var(--card); border: 1px solid #cfdad4; border-radius: 20px;
  padding: 1px 10px; font-size: 12px; font-weight: 700; color: var(--muted);
}
.rv-band.goal { background: #fff6f0; border-color: #f0c9a8; }
.rv-band.goal span { border-color: #f0c9a8; color: #9a3412; }
.rv-band.tw { background: #f2f8fc; border-color: #bcd6e8; }
.rv-band.tw span { border-color: #bcd6e8; color: var(--accent); }
.rv-lines { z-index: 1; }
.rv-node { z-index: 2; }
.rv-lines { position: absolute; inset: 0; }
.rv-lines .rl { fill: none; stroke: #8aa094; stroke-width: 1.6; }
.rv-lines .rl.dash { stroke: #b9c4bd; stroke-dasharray: 5 4; }
.rv-lines .rl-lb { font-size: 11.5px; fill: #6b7a72; font-family: inherit; paint-order: stroke; stroke: var(--card); stroke-width: 4px; }

.rv-node {
  position: absolute; box-sizing: border-box;
  background: var(--card); border: 1.5px solid var(--line); border-left-width: 5px;
  border-radius: 10px; padding: 8px 11px;
  display: flex; flex-direction: column; justify-content: center; gap: 2px;
  box-shadow: var(--shadow);
}
.rv-node b { font-size: 14px; line-height: 1.3; }
.rv-node span { font-size: 12px; color: var(--muted); line-height: 1.35; }
.rv-node .rv-nq { font-style: normal; font-size: 11.5px; font-weight: 700; margin-top: 2px; }
.rv-node .rv-nq.zero { font-weight: 400; color: #9aa5a0; }
.rv-node .rv-nq.ref { font-weight: 600; color: var(--accent); }
.rv-node.clickable { cursor: pointer; transition: transform 0.1s, box-shadow 0.1s; }
.rv-node.clickable:hover { transform: translateY(-2px); box-shadow: 0 3px 10px rgba(20, 40, 30, 0.16); }
.rv-node.k-mech { border-style: dashed; }
.rv-node.k-tw { background: #f2f8fc; }

.h-hot.rv-node { border-color: #c2410c; background: #fff6f0; }
.h-hot.rv-node .rv-nq { color: #9a3412; }
.h-warm.rv-node { border-color: #b7791f; background: #fffcf5; }
.h-warm.rv-node .rv-nq { color: #8a5a10; }
.h-mild.rv-node { border-color: #94a3b8; }
.h-mild.rv-node .rv-nq { color: #52616f; }
.h-none.rv-node { border-color: var(--line); background: #fafbfa; }

/* 年表：上軌國際、中間年份軸、下軌台灣 */
.rv-tl { display: grid; grid-template-rows: auto 34px auto; align-items: end; column-gap: 8px; position: relative; padding: 4px 0 8px; }
.rv-tl .rv-line { align-self: center; height: 2px; background: var(--line); z-index: 0; }
.rv-year {
  align-self: center; justify-self: center; z-index: 1;
  background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  padding: 1px 9px; font-size: 12.5px; font-weight: 700; color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.rv-year.hot { border-color: #c2410c; color: #9a3412; background: #fff1e8; }
/* 軌道標籤：橫向捲動時黏在左緣，才看得出哪條是國際、哪條是台灣 */
.rv-tlab {
  position: sticky; left: 0; z-index: 3; align-self: center;
  background: var(--card); border: 1px solid var(--line); border-radius: 7px;
  padding: 3px 8px; font-size: 12.5px; font-weight: 700; text-align: center;
}
.rv-tlab.intl { color: var(--brand); border-color: #bfe0d0; }
.rv-tlab.tw { color: var(--accent); border-color: #bcd6e8; background: #f2f8fc; }
.rv-cell { display: flex; flex-direction: column; gap: 6px; padding: 0 2px; }
.rv-cell.intl { justify-content: flex-end; padding-bottom: 8px; }
.rv-cell.tw { justify-content: flex-start; padding-top: 8px; align-self: start; }
.rv-ev {
  border: 1.5px solid var(--line); border-left-width: 4px; border-radius: 9px;
  padding: 7px 9px; background: var(--card); font-size: 12.5px; line-height: 1.35;
}
.rv-ev b { display: block; font-size: 13px; }
.rv-ev span { display: block; color: var(--muted); font-size: 11.5px; margin-top: 2px; }
.rv-ev i { display: block; font-style: normal; font-size: 11px; font-weight: 700; margin-top: 3px; }
.rv-ev.clickable { cursor: pointer; }
.rv-ev.clickable:hover { border-color: var(--brand); }
.h-hot.rv-ev { border-color: #c2410c; background: #fff6f0; }
.h-hot.rv-ev i { color: #9a3412; }
.h-warm.rv-ev { border-color: #b7791f; background: #fffcf5; }
.h-warm.rv-ev i { color: #8a5a10; }
.h-mild.rv-ev { border-color: #94a3b8; }
.h-mild.rv-ev i { color: #52616f; }
.rv-cell.tw .rv-ev { background: #f2f8fc; }

/* 知識點卡 */
.rv-point { border-left: 5px solid var(--line); scroll-margin-top: 70px; }
.rv-point.h-hot { border-left-color: #c2410c; }
.rv-point.h-warm { border-left-color: #b7791f; }
.rv-point.h-mild { border-left-color: #94a3b8; }
.rv-point.lit { box-shadow: 0 0 0 3px rgba(26, 122, 79, 0.35); }
.rv-phead { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.rv-phead h3 { margin: 0; color: var(--ink); font-size: 16.5px; }
.rv-heat { font-size: 12px; font-weight: 700; border-radius: 20px; padding: 2px 10px; white-space: nowrap; }
.rv-heat.h-hot { background: #ffe4d3; color: #9a3412; }
.rv-heat.h-warm { background: var(--warn-soft); color: #8a5a10; }
.rv-heat.h-mild { background: #eef2f6; color: #52616f; }
.rv-heat.h-none { background: #f1f3f1; color: #8b968f; }
.rv-sum { margin: 8px 0 4px; }
.rv-block h4 { margin: 12px 0 4px; font-size: 14px; color: var(--brand); }
.rv-block ul { margin: 0; padding-left: 20px; }
.rv-block li { margin: 3px 0; }
.rv-block.trap h4 { color: #b45309; }
.rv-block.trap li::marker { color: #b45309; }
.rv-quote {
  margin: 12px 0 0; padding: 9px 13px; border-left: 3px solid var(--line);
  background: #f8faf9; font-size: 14px; color: #3d4a44;
}
.rv-quote cite { display: block; font-style: normal; font-size: 12px; color: var(--muted); margin-top: 5px; }
.rv-foot { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 13px; }
.rv-foot button.link { border: none; background: none; color: var(--accent); padding: 4px 0; font-size: 14px; }
.rv-foot button.link:hover { text-decoration: underline; }
.rv-ids { margin-top: 10px; }
.rv-ids summary { cursor: pointer; font-size: 13px; color: var(--muted); }
.rv-ids .mono { font-size: 12px; line-height: 2; margin: 6px 0 0; }
.rv-ids .qid { background: #f1f3f1; border-radius: 5px; padding: 2px 6px; color: #5c675f; }
.rv-ids .qid.off { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.rv-caveat { border-color: #f0d8a8; background: var(--warn-soft); }
.rv-caveat h3 { color: #8a5a10; margin-top: 0; }
.rv-caveat ul { margin: 0; padding-left: 20px; }
.rv-caveat li { margin: 5px 0; font-size: 14.5px; }

/* 練習頁「只練這批題」的限定 chip */
.chip.idsel {
  background: var(--brand-soft); color: var(--brand); font-weight: 600; font-size: 13.5px;
  border-radius: 20px; padding: 4px 6px 4px 12px;
}
.chip.idsel button {
  border: none; background: rgba(26, 122, 79, 0.12); color: var(--brand);
  border-radius: 50%; width: 22px; height: 22px; padding: 0; font-size: 12px; line-height: 1;
}
.chip.idsel button:hover { background: var(--brand); color: #fff; }

@media (max-width: 620px) {
  .rv-legend { gap: 8px 14px; }
  .rv-legend .lg em { display: none; }
}

/* 考前衝刺卡：一句話速記 */
.rv-sprint { border-color: #f0c9a8; background: linear-gradient(180deg, #fff8f2 0%, var(--card) 120px); }
.rv-sprint h3 { color: #9a3412; margin-top: 0; }
.sp-list { margin: 0; padding-left: 22px; }
.sp-list .sp-row { margin: 0 0 9px; padding: 7px 10px 7px 12px; border-left: 4px solid var(--line); background: var(--card); border-radius: 0 8px 8px 0; }
.sp-list .sp-row b { font-size: 14.5px; }
.sp-list .sp-row div { font-size: 14px; line-height: 1.6; margin-top: 2px; }
.sp-list .sp-n { font-size: 11.5px; font-weight: 700; margin-left: 7px; color: var(--muted); white-space: nowrap; }
.sp-row.h-hot { border-left-color: #c2410c; }
.sp-row.h-hot .sp-n { color: #9a3412; }
.sp-row.h-warm { border-left-color: #b7791f; }
.sp-row.h-warm .sp-n { color: #8a5a10; }
.sp-row.h-mild { border-left-color: #94a3b8; }
.sp-row.h-mild .sp-n { color: #52616f; }

/* ── 白話導讀（guide.js）── */
details.guide {
  border: 1px solid #cfe3d8; border-left: 4px solid var(--brand); border-radius: 10px;
  background: #f4faf7; margin: 0 0 14px; padding: 0;
}
details.guide > summary {
  cursor: pointer; list-style: none; padding: 10px 14px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-weight: 600; color: var(--brand); user-select: none;
}
details.guide > summary::-webkit-details-marker { display: none; }
details.guide > summary::after { content: "展開 ▾"; margin-left: auto; font-weight: 400; font-size: 13px; color: var(--muted); }
details.guide[open] > summary::after { content: "收合 ▴"; }
details.guide .guide-span { font-weight: 400; }
.guide-body { padding: 2px 16px 12px; font-size: 15px; line-height: 1.8; }
.guide-body p { margin: 0.6em 0; }
.guide-hook { font-weight: 600; color: var(--ink); }
.guide-h { font-weight: 700; color: var(--brand); margin: 12px 0 4px; font-size: 14.5px; }
.guide-h .muted { font-weight: 400; margin-left: 6px; }
.guide-map ul { margin: 0; padding-left: 1.3em; }
.guide-map li { margin: 3px 0; }
details.guide-q { margin: 4px 0; border: 1px solid #d5e6dc; border-radius: 8px; background: #fff; }
details.guide-q > summary { cursor: pointer; padding: 7px 12px; list-style: none; display: flex; gap: 8px; }
details.guide-q > summary::-webkit-details-marker { display: none; }
details.guide-q > summary::before { content: "Q"; font-weight: 700; color: var(--brand); flex: none; }
details.guide-q .guide-a { padding: 2px 12px 10px 30px; color: var(--ink); border-top: 1px dashed #d5e6dc; margin-top: 2px; padding-top: 8px; }
.guide-terms { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.guide-terms .guide-h { margin: 0 4px 0 0; }
.term-chip {
  padding: 3px 10px; font-size: 13.5px; border-radius: 999px;
  border: 1px solid #bcd9c9; background: #fff; color: var(--brand); cursor: pointer;
}
.term-chip:hover { background: var(--brand-soft); }
.guide-foot { margin-top: 10px; padding-top: 8px; border-top: 1px dashed #cfe3d8; }

/* 名詞底線：原文與詳解裡第一次出現的專有名詞。只用 border 不改字，畫記 offset 不受影響 */
.term { border-bottom: 1.5px dotted var(--accent); cursor: help; color: inherit; }
.term:hover { background: rgba(15, 92, 140, 0.08); }
.term-pop {
  position: absolute; z-index: 71;
  width: min(360px, calc(100vw - 24px));
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 14px; box-shadow: 0 6px 24px rgba(20, 40, 30, 0.22);
  font-size: 14.5px; line-height: 1.7;
  max-height: 70vh; overflow-y: auto; /* 內容長就捲，不對字數設硬限制 */
}
.term-pop-head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.term-pop-head > b { font-size: 16px; color: var(--brand); }
.term-pop-x { margin-left: auto; padding: 2px 8px; font-size: 13px; }
.term-pop-tag {
  display: inline-block; font-size: 11.5px; padding: 0 6px; border-radius: 4px; margin-right: 6px; vertical-align: 1px;
  background: var(--brand-soft); color: var(--brand);
}
.term-pop-ex { margin-top: 8px; padding: 8px 10px; background: #f4faf7; border-radius: 8px; }
.term-pop-quote { margin-top: 8px; padding: 8px 10px; background: var(--warn-soft); border-radius: 8px; }
.term-pop-foot { margin-top: 8px; display: flex; gap: 10px; flex-wrap: wrap; justify-content: space-between; }

.hl-term-row { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); }
.hl-term-row button { font-size: 13.5px; }