:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --active-bg: #eff6ff;
  --star: #f59e0b;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

/* hidden 属性必须永远生效（防止被 display:grid 等规则覆盖） */
[hidden] { display: none !important; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.muted { color: var(--muted); font-size: 13px; }

/* ===== 顶栏 ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand h1 { font-size: 20px; }
.brand-sub { font-size: 12px; color: var(--muted); }
.tabs { display: flex; gap: 8px; }
.tab-btn {
  border: 1px solid var(--border);
  background: var(--card);
  padding: 8px 22px;
  border-radius: 999px;
  font-size: 15px;
  cursor: pointer;
  color: var(--text);
}
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

main { padding: 16px; max-width: 1560px; margin: 0 auto; }

/* ===== 课文布局（三栏：目录 | 课文 | 单词） ===== */
#tab-study {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr) 300px;
  gap: 16px;
  align-items: start;
}

.book-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 12px; }
.book-tabs .book-btn {
  flex: 1;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 10px;
  padding: 8px 4px;
  text-align: center;
  cursor: pointer;
  font-size: 14px;
}
.book-tabs .book-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.book-tabs .book-btn small { display: block; font-size: 10px; opacity: .75; }

.lesson-panel {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 12px;
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 92px);
  display: flex;
  flex-direction: column;
}
.lesson-list { overflow-y: auto; flex: 1; margin-top: 4px; }
.lesson-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 9px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
}
.lesson-item:hover { background: var(--bg); }
.lesson-item.active { background: var(--active-bg); color: var(--primary-dark); font-weight: 600; }

.study-main { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.player-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.unit-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.unit-title { font-size: 17px; font-weight: 600; }
.loop-toggle { display: flex; align-items: center; gap: 5px; font-size: 13px; color: var(--muted); cursor: pointer; }

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 12px 0;
}
.ctl-btn {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 16px;
  cursor: pointer;
}
.ctl-btn.play {
  width: 52px; height: 52px;
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-size: 20px;
}
.time-label { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }

.lrc-list {
  max-height: calc(100vh - 250px);
  min-height: 200px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
  padding-top: 8px;
  scroll-behavior: smooth;
}
.lrc-empty { color: var(--muted); text-align: center; padding: 40px 0; font-size: 14px; }
.lrc-line {
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  line-height: 1.55;
}
.lrc-line:hover { background: var(--bg); }
.lrc-line.active { background: var(--active-bg); }
.lrc-line .en { font-size: 16px; }
.lrc-line.active .en { color: var(--primary-dark); font-weight: 600; }
.lrc-line .zh { font-size: 13px; color: var(--muted); }

/* 本课单词 */
.unit-words-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
/* 右栏单词卡片：跟随滚动，独立滚动区 */
#tab-study > .unit-words-card {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 92px);
  overflow-y: auto;
}
.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  margin-bottom: 10px;
}
.unit-words { display: flex; flex-wrap: wrap; gap: 8px; }
.word-chip {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 13px;
  cursor: pointer;
}
.word-chip:hover { border-color: var(--primary); color: var(--primary-dark); }
.word-chip b { font-weight: 600; }
.word-chip .pos { color: var(--muted); margin: 0 2px; }

/* ===== 单词 Tab ===== */
.words-toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 14px;
}
.sel, .search {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
  background: var(--card);
  color: var(--text);
}
.search { flex: 1; min-width: 180px; }

.words-table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: auto;
  max-height: calc(100vh - 180px);
}
.words-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.words-table th, .words-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: middle;
}
.words-table th {
  position: sticky; top: 0;
  background: var(--bg);
  font-size: 13px;
  color: var(--muted);
  z-index: 2;
}
.words-table .w { font-size: 15px; font-weight: 600; cursor: pointer; }
.words-table .w:hover { color: var(--primary-dark); }
.words-table .phon { color: var(--muted); white-space: nowrap; }
.words-table .pos { color: var(--muted); white-space: nowrap; }
.words-table .les { color: var(--muted); white-space: nowrap; font-size: 12px; }
.lesson-group th {
  background: var(--active-bg);
  color: var(--primary-dark);
  font-size: 13px;
}
.audio-btn {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 6px;
  font-size: 12px;
  padding: 3px 7px;
  cursor: pointer;
  margin-right: 4px;
}
.audio-btn:hover { border-color: var(--primary); color: var(--primary-dark); }
.audio-btn.playing { background: var(--primary); color: #fff; border-color: var(--primary); }
.star-btn {
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 16px;
  color: #d1d5db;
  transition: color .15s, transform .15s;
}
.star-btn.on {
  color: var(--star);
  text-shadow: 0 0 8px rgba(245, 158, 11, .45);
}
.star-btn.pop { animation: star-pop .35s ease; }
@keyframes star-pop {
  0% { transform: scale(1); }
  45% { transform: scale(1.7); }
  100% { transform: scale(1); }
}
.word-chip .star-btn { font-size: 12px; margin-left: 5px; color: #d1d5db; }
.word-chip .star-btn.on { color: var(--star); }

/* ===== 复习模式：收起学习入口，只留退出按钮 ===== */
body.reviewing .tab-btn { display: none; }
.review-exit {
  border: 1px solid var(--star);
  background: transparent;
  color: var(--star);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.review-exit:hover { background: var(--star); color: #fff; }

/* ===== 复习 Tab ===== */
/* 模式切换（表格 / 卡片） */
.mode-switch {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.mode-switch button {
  border: 0;
  background: var(--card);
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  color: var(--muted);
}
.mode-switch button.active { background: var(--primary); color: #fff; }

/* 表格模式 */
.rv-table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.review-table { width: 100%; }
.review-table .th-mn { text-align: left; }
.review-table .rv-mn { max-width: 460px; }
.hidden-mn {
  filter: blur(7px);
  user-select: none;
  cursor: pointer;
}
.review-table.reveal-all .hidden-mn {
  filter: none;
  user-select: auto;
  cursor: default;
}
.master-btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  border-radius: 6px;
  width: 30px;
  height: 26px;
  cursor: pointer;
  font-size: 14px;
}
.master-btn:hover {
  border-color: #10b981;
  color: #059669;
  background: #ecfdf5;
}
.rv-pager {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  margin-top: 14px;
}
.rv-pager button {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 8px;
  padding: 6px 16px;
  font-size: 13px;
  cursor: pointer;
}
.rv-pager button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary-dark); }
.rv-pager button:disabled { opacity: .4; cursor: default; }
.rv-pager span { font-size: 13px; color: var(--muted); }

.review-toolbar {
  display: flex;
  gap: 16px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 14px;
}
.badge {
  display: inline-block;
  min-width: 18px;
  padding: 0 5px;
  margin-left: 4px;
  border-radius: 9px;
  background: var(--star);
  color: #fff;
  font-size: 12px;
  line-height: 18px;
  vertical-align: 1px;
}
.review-main { display: flex; flex-direction: column; align-items: center; }
.review-card {
  width: 100%;
  max-width: 640px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 42px 28px 28px;
  text-align: center;
  box-shadow: 0 4px 24px rgba(31, 41, 55, .06);
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}
.review-card .rv-word { font-size: 40px; font-weight: 700; cursor: pointer; }
.review-card .rv-word:hover { color: var(--primary-dark); }
.review-card .rv-phon { font-size: 16px; color: var(--muted); }
.review-card .rv-phon .pos { margin-left: 6px; }
.review-card .rv-meaning { font-size: 20px; margin-top: 6px; }
.review-card .rv-meaning.hidden-mn {
  filter: blur(7px);
  user-select: none;
  cursor: pointer;
}
.review-card .rv-hint { font-size: 12px; color: var(--muted); }
.review-card .rv-btns {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
  flex-wrap: wrap;
}
.review-card .rv-btns .audio-btn { font-size: 14px; padding: 6px 14px; }
.review-card .rv-btns .action-btn {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 14px;
  cursor: pointer;
}
.review-card .rv-btns .action-btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.review-card .rv-btns .action-btn.mastered {
  background: #ecfdf5;
  border-color: #10b981;
  color: #059669;
}
.rv-nav {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-top: 18px;
}
.rv-nav button {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 8px;
  padding: 8px 18px;
  font-size: 14px;
  cursor: pointer;
}
.rv-nav button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary-dark); }
.rv-nav button:disabled { opacity: .4; cursor: default; }
.rv-empty {
  text-align: center;
  color: var(--muted);
  padding: 60px 0;
  font-size: 15px;
}

/* ===== 主题切换按钮 ===== */
.theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
  margin-left: 8px;
}
.theme-toggle:hover { color: var(--primary-dark); border-color: var(--primary); }

/* ===== 假状态栏（仅 IDE 风格显示） ===== */
.fake-statusbar {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 50;
  align-items: center;
  gap: 14px;
  padding: 3px 14px;
  font-size: 11px;
  line-height: 18px;
}

/* ==========================================================
   IDE 摸鱼主题 —— body.ide（VS Code Dark+ 风格）
   仅覆盖外观，不改变任何功能与结构
   ========================================================== */
body.ide {
  --bg: #1e1e1e;
  --card: #252526;
  --text: #d4d4d4;
  --muted: #858585;
  --border: #333333;
  --primary: #569cd6;
  --primary-dark: #9cdcfe;
  --active-bg: #2a2d2e;
  --star: #dcdcaa;
  --radius: 6px;
  padding-bottom: 24px; /* 给状态栏留位置 */
}
body.ide,
body.ide button, body.ide input, body.ide select {
  font-family: "SF Mono", Menlo, Consolas, "JetBrains Mono", "PingFang SC", "Microsoft YaHei", monospace;
}
body.ide { font-size: 13px; }

/* 顶栏 → 编辑器标题栏 */
body.ide .topbar {
  background: #323233;
  border-bottom: 1px solid #1b1b1b;
  padding: 6px 14px;
}
body.ide .brand h1 { font-size: 13px; font-weight: 400; color: #cccccc; }
body.ide .brand h1::before { content: "● "; color: #f14c4c; font-size: 10px; }
body.ide .brand-sub { display: none; }

/* Tab → 编辑器标签页 */
body.ide .tab-btn {
  border: 0;
  border-radius: 0;
  background: transparent;
  color: #969696;
  padding: 6px 16px;
  font-size: 12px;
  border-top: 1px solid transparent;
}
body.ide .tab-btn.active {
  background: var(--bg);
  color: #ffffff;
  border-top-color: #f0a30a;
}
body.ide .theme-toggle {
  border-color: #3c3c3c;
  background: transparent;
  color: #858585;
  padding: 4px 10px;
}
body.ide .badge { background: #f0a30a; color: #1e1e1e; font-size: 10px; }

/* 课程面板 → 文件树 */
body.ide .lesson-panel { background: #252526; border-color: #1b1b1b; }
body.ide .book-tabs .book-btn {
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #a9a9a9;
  font-size: 12px;
  border-radius: 4px;
}
body.ide .book-tabs .book-btn small { font-size: 9px; }
body.ide .book-tabs .book-btn.active {
  background: #094771;
  border-color: #0a64a4;
  color: #ffffff;
}
body.ide .lesson-item {
  font-size: 12px;
  color: #c5c5c5;
  border-radius: 4px;
  padding: 6px 10px;
}
body.ide .lesson-item::before { content: "» "; color: #5a5a5a; }
body.ide .lesson-item:hover { background: #2a2d2e; }
body.ide .lesson-item.active {
  background: #094771;
  color: #ffffff;
}
body.ide .lesson-item.active::before { content: "▸ "; color: #f0a30a; }

/* 播放器 */
body.ide .player-card { background: #252526; border-color: #1b1b1b; }
body.ide .unit-title { font-size: 13px; font-weight: 400; color: #e8e8e8; }
body.ide .unit-title::before { content: "/* "; color: #5a5a5a; }
body.ide .unit-title::after { content: " */"; color: #5a5a5a; }
body.ide .loop-toggle { color: #858585; font-size: 11px; }
body.ide .ctl-btn {
  border-radius: 4px;
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #cccccc;
  font-size: 13px;
}
body.ide .ctl-btn.play {
  background: #094771;
  border-color: #0a64a4;
  color: #ffffff;
}
body.ide .time-label { color: #858585; font-size: 11px; }
body.ide .time-label::before { content: "⏱ "; }

/* 字幕 → 代码行 */
body.ide .lrc-list {
  background: #1e1e1e;
  border-top: 1px solid #1b1b1b;
  counter-reset: lrc-line;
  padding: 6px 0;
}
body.ide .lrc-line {
  counter-increment: lrc-line;
  position: relative;
  padding: 4px 12px 4px 52px;
  border-radius: 0;
  border-left: 2px solid transparent;
}
body.ide .lrc-line::before {
  content: counter(lrc-line);
  position: absolute;
  left: 0;
  width: 38px;
  text-align: right;
  color: #5a5a5a;
  font-size: 11px;
  top: 5px;
}
body.ide .lrc-line .en { font-size: 13px; color: #9cdcfe; }
body.ide .lrc-line .zh { font-size: 12px; color: #6a9955; }
body.ide .lrc-line .zh::before { content: "// "; color: #524e46; }
body.ide .lrc-line:hover { background: #2a2d2e; }
body.ide .lrc-line.active {
  background: rgba(38, 79, 120, .35);
  border-left-color: #f0a30a;
}
body.ide .lrc-line.active .en { color: #ffffff; }
body.ide .lrc-empty { color: #5a5a5a; font-size: 12px; }

/* 本课单词 → 常量定义 */
body.ide .unit-words-card { background: #252526; border-color: #1b1b1b; }
body.ide .card-head { font-size: 12px; font-weight: 400; color: #9cdcfe; }
body.ide .card-head::before { content: "import { words } from './lesson';  /* "; color: #524e46; }
body.ide .card-head::after { content: " */"; color: #524e46; }
body.ide .word-chip {
  background: transparent;
  border: 1px solid #2d2d2d;
  border-radius: 4px;
  font-size: 12px;
  color: #c5c5c5;
}
body.ide .word-chip b { color: #4ec9b0; font-weight: 400; }
body.ide .word-chip .pos { color: #569cd6; }
body.ide .word-chip .mn { color: #6a9955; }
body.ide .word-chip .mn::before { content: "// "; color: #524e46; }
body.ide .word-chip:hover { border-color: #569cd6; color: #fff; }

/* 单词表 → 符号表 */
body.ide .words-toolbar { background: #252526; border-color: #1b1b1b; }
body.ide .sel, body.ide .search {
  background: #1e1e1e;
  border-color: #3c3c3c;
  color: #d4d4d4;
  font-size: 12px;
}
body.ide .words-table-wrap { background: #252526; border-color: #1b1b1b; }
body.ide .words-table { font-size: 12px; }
body.ide .words-table th {
  background: #2d2d2d;
  color: #858585;
  font-size: 11px;
  font-weight: 400;
}
body.ide .words-table td { border-bottom-color: #2a2a2a; }
body.ide .words-table .w { color: #4ec9b0; font-weight: 400; }
body.ide .words-table .w::before { content: "const "; color: #569cd6; }
body.ide .words-table .w::after { content: " ="; color: #569cd6; }
body.ide .words-table .phon { color: #ce9178; }
body.ide .words-table .phon::before { content: '"'; }
body.ide .words-table .phon::after { content: '"'; }
body.ide .words-table .pos { color: #dcdcaa; }
body.ide .words-table td:last-child { color: #6a9955; }
body.ide .words-table td:last-child::before { content: "// "; color: #524e46; }
body.ide .words-table .les { color: #5a5a5a; }
body.ide .lesson-group th {
  background: #1e1e1e;
  color: #9cdcfe;
  font-size: 11px;
}
body.ide .lesson-group th::before { content: "/* "; color: #524e46; }
body.ide .lesson-group th::after { content: " */"; color: #524e46; }
body.ide .audio-btn {
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #9cdcfe;
  border-radius: 4px;
}
body.ide .audio-btn:hover { border-color: #569cd6; color: #fff; }
body.ide .audio-btn.playing { background: #094771; border-color: #0a64a4; color: #fff; }

/* 复习卡片 → 调试监视 */
body.ide .review-toolbar { background: #252526; border-color: #1b1b1b; }
body.ide .review-exit {
  border-color: #dcdcaa;
  color: #dcdcaa;
  border-radius: 4px;
  font-size: 12px;
}
body.ide .review-exit:hover { background: #dcdcaa; color: #1e1e1e; }
body.ide .mode-switch { border-color: #3c3c3c; }
body.ide .mode-switch button { background: #2d2d2d; color: #cccccc; border-radius: 0; font-size: 12px; }
body.ide .mode-switch button.active { background: #094771; color: #fff; }
body.ide .rv-table-wrap { background: #252526; border-color: #1b1b1b; }
body.ide .rv-pager span { color: #858585; }
body.ide .rv-pager button {
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #cccccc;
  border-radius: 4px;
  font-size: 12px;
}
body.ide .master-btn {
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #cccccc;
  border-radius: 4px;
}
body.ide .master-btn:hover { background: #1e3a2a; border-color: #10b981; color: #6ee7a0; }
body.ide .review-table .rv-mn { color: #6a9955; }
body.ide .review-table .rv-mn::before { content: "// "; color: #524e46; }
body.ide .review-card {
  background: #1e1e1e;
  border-color: #1b1b1b;
  box-shadow: none;
  text-align: left;
  padding: 24px 28px;
  min-height: 220px;
}
body.ide .review-card::before {
  content: "debugger · watch";
  display: block;
  color: #5a5a5a;
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
body.ide .rv-word { font-size: 28px; color: #4ec9b0; text-align: left; }
body.ide .rv-word::before { content: "» "; color: #858585; }
body.ide .rv-word:hover { color: #4ec9b0; }
body.ide .rv-phon { color: #ce9178; text-align: left; }
body.ide .rv-phon::before { content: '"'; }
body.ide .rv-phon .pos { color: #dcdcaa; }
body.ide .rv-phon::after { content: '"'; }
body.ide .rv-meaning { color: #6a9955; text-align: left; }
body.ide .rv-meaning::before { content: "// "; color: #524e46; }
body.ide .rv-hint { text-align: left; color: #5a5a5a; font-size: 11px; }
body.ide .rv-btns { justify-content: flex-start; }
body.ide .rv-btns .action-btn {
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #cccccc;
  border-radius: 4px;
  font-size: 12px;
}
body.ide .rv-btns .action-btn.primary { background: #094771; border-color: #0a64a4; color: #fff; }
body.ide .rv-btns .action-btn.mastered { background: #1e3a2a; border-color: #10b981; color: #6ee7a0; }
body.ide .rv-nav button {
  background: #2d2d2d;
  border-color: #1b1b1b;
  color: #cccccc;
  border-radius: 4px;
  font-size: 12px;
}
body.ide .rv-empty { color: #5a5a5a; font-size: 12px; }

/* Toast → 终端输出 */
body.ide .toast {
  background: #252526;
  border: 1px solid #3c3c3c;
  color: #c5c5c5;
  font-size: 12px;
  bottom: 40px;
}
body.ide .toast::before { content: "$ "; color: #4ec9b0; }

/* 状态栏显示 */
body.ide .fake-statusbar {
  display: flex;
  background: #007acc;
  color: #ffffff;
}
body.ide .fsb-spacer { flex: 1; }
body.ide .fsb-item { opacity: .95; }

/* 滚动条 */
body.ide ::-webkit-scrollbar { width: 10px; height: 10px; }
body.ide ::-webkit-scrollbar-thumb { background: #424242; border-radius: 5px; }
body.ide ::-webkit-scrollbar-thumb:hover { background: #4f4f4f; }
body.ide ::-webkit-scrollbar-track { background: #1e1e1e; }

/* 选中文本 */
body.ide ::selection { background: #264f78; color: #fff; }
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(31, 41, 55, .92);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 99;
}

/* ===== 响应式 ===== */
@media (max-width: 1180px) {
  /* 中屏：退化为两栏，单词卡回到课文下方 */
  #tab-study { grid-template-columns: 230px minmax(0, 1fr); }
  #tab-study > .unit-words-card {
    position: static;
    max-height: none;
    overflow: visible;
    grid-column: 2;
  }
}
@media (max-width: 860px) {
  #tab-study { grid-template-columns: 1fr; }
  #tab-study > .unit-words-card { grid-column: auto; }
  .lesson-panel { position: static; max-height: none; }
  .lesson-list { max-height: 34vh; }
  .lrc-list { max-height: 46vh; }
  .brand-sub { display: none; }
}