:root {
  /* 浅色（默认）· 专业干净工具派 */
  --bg: #F7F6F3;            /* 画布 */
  --bg-soft: #F1EFEA;       /* 凹陷槽/输入底/进度底 */
  --bg-card: #FFFFFF;       /* 卡片 */
  --bg-card-hover: #FBFAF7; /* hover */
  --bg-inset: #F1EFEA;
  --border: #ECE8E1;
  --border-2: #E2DDD3;
  --text: #20242B;
  --text-dim: #6B7280;
  --text-faint: #9AA1AC;
  /* 强调：珊瑚（逆熵——只用在主操作/当前态/关键强调） */
  --accent: #EF5A36;
  --accent-2: #EF5A36;
  --accent-ink: #D2461F;
  --accent-soft: #FDE9E2;
  --grad-accent: var(--accent);
  --grad-streak: var(--accent);
  --grad-success: var(--green);
  /* 成功/进度：青绿 */
  --green: #0E9F8E;
  --green-soft: #E2F4F1;
  --amber: #E0922A;
  --red: #E0503A;
  /* 圆角阶 */
  --r-xs: 7px; --r-sm: 10px; --r-md: 13px; --r-lg: 18px; --r-full: 999px;
  --radius: 13px;
  /* 阴影 */
  --sh-1: 0 1px 2px rgba(20,20,20,.04);
  --sh-2: 0 4px 16px rgba(20,20,20,.07);
  --sh-3: 0 10px 30px rgba(20,20,20,.10);
  --shadow: var(--sh-2);
  --glow-accent: 0 0 0 2px var(--accent-soft);
  --glow-amber: 0 0 0 2px var(--accent-soft);
  --ease: cubic-bezier(.22,.61,.36,1);
  --spring: cubic-bezier(.34,1.56,.64,1);
  font-synthesis: none;
}
/* 夜间模式：冷中性 + 同一珊瑚强调 */
html[data-theme="dark"] {
  --bg: #14161A;
  --bg-soft: #23262E;
  --bg-card: #1C1F26;
  --bg-card-hover: #242832;
  --bg-inset: #23262E;
  --border: rgba(255,255,255,.08);
  --border-2: rgba(255,255,255,.15);
  --text: #E8EAED;
  --text-dim: #9AA1AC;
  --text-faint: #6B7280;
  --accent: #FF6A45;
  --accent-ink: #FF6A45;
  --accent-soft: rgba(255,106,69,.16);
  --green: #1FB6A2;
  --green-soft: rgba(31,182,162,.16);
  --amber: #E8A33C;
  --red: #F0604A;
  --sh-1: 0 1px 2px rgba(0,0,0,.3);
  --sh-2: 0 6px 20px rgba(0,0,0,.4);
  --sh-3: 0 12px 36px rgba(0,0,0,.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
/* hidden 复位：很多容器用 display:flex 会盖过 [hidden] 默认的 display:none，导致"隐藏"元素仍显示成空条 */
[hidden] { display: none !important; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  transition: background .2s, color .2s;
}

#app { max-width: 1160px; margin: 0 auto; padding: 0; }
#main { max-width: 1160px; margin: 0 auto; padding: 24px 28px 60px; }

/* ---------- 网页顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 20px;
  max-width: 1160px; margin: 0 auto; padding: 0 28px; height: 60px;
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar::before { content: ""; position: fixed; left: 0; right: 0; top: 0; height: 60px; z-index: -1;
  background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 9px; cursor: pointer; font-weight: 800; font-size: 16px; letter-spacing: -.2px; }
.brand .logo { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); display: grid; place-items: center; font-size: 16px; }
.brand .brand-name { color: var(--text); }
.tabs { display: flex; gap: 2px; }
.tab { border: 0; background: transparent; color: var(--text-dim); padding: 7px 13px; border-radius: 8px;
  cursor: pointer; font-size: 13.5px; font-weight: 600; transition: .15s; position: relative; }
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); }
.tab.active::after { content: ""; position: absolute; left: 13px; right: 13px; bottom: -19px; height: 2px; background: var(--accent); border-radius: 2px; }
.topbar-spacer { flex: 1; }
.topbar .search { display: flex; align-items: center; gap: 8px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 9px; padding: 8px 12px; width: 210px; color: var(--text-faint); }
.topbar .search input { border: 0; outline: 0; background: none; font-family: inherit; font-size: 13px; color: var(--text); width: 100%; }
.topbar .search:focus-within { border-color: var(--border-2); }

/* ---------- 视图切换 ---------- */
.view { display: none; animation: fade .25s ease; }
.view.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- 课程库：双栏（内容 + 右栏） ---------- */
.lib-grid { display: grid; grid-template-columns: minmax(0, 1fr) 296px; gap: 30px; align-items: start; }
.lib-main { min-width: 0; }
.hero { display: none; }
.lib-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 4px 0 14px; }
.lib-head h1 { font-size: 20px; font-weight: 800; letter-spacing: -.3px; }
.lib-head .lib-count { font-size: 12px; color: var(--text-faint); margin-left: auto; }
.lib-import { font-size: 12.5px; font-weight: 600; color: var(--text-dim); background: none; border: 0; cursor: pointer; }
.lib-import:hover { color: var(--accent); }

/* 右栏 */
.rail { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 78px; }
.panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); padding: 17px; box-shadow: var(--sh-1); }
.panel .ph { display: flex; align-items: center; justify-content: space-between; margin-bottom: 13px; }
.panel .ph h3 { font-size: 14px; font-weight: 700; letter-spacing: .2px; }
.panel .ph .more { font-size: 12px; font-weight: 600; color: var(--accent); cursor: pointer; }
.trend .cap { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-faint); margin-top: 8px; }
.trend .cap .val { color: var(--green); font-weight: 700; }
.trend .empty { font-size: 12px; color: var(--text-faint); line-height: 1.6; }

/* 课程包 / 学习路径 */
.pack-row { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(230px, 1fr); gap: 12px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 18px; scrollbar-width: thin; }
.pack-card { display: flex; gap: 12px; align-items: center; background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; cursor: pointer; transition: .15s; }
.pack-card:hover { background: var(--bg-card-hover); border-color: var(--border-2); }
.pack-card.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.pack-card.pack-path { border-left: 3px solid var(--accent); }
.pack-card.pack-path.active { border-left-color: var(--accent); }

.pair-bar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 10px 14px; margin-bottom: 14px; background: var(--accent-soft);
  border: 1px solid var(--accent); border-radius: var(--r-sm); font-size: 13px;
}
.pair-bar[hidden] { display: none !important; }
.pair-label { color: var(--text-faint); font-weight: 600; }
.pair-link {
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text);
  padding: 5px 11px; border-radius: 999px; cursor: pointer; font-size: 12.5px;
}
.pair-link:hover { border-color: var(--accent); color: var(--accent); }
.pair-hint { color: var(--text-faint); font-size: 12px; margin-left: auto; }

.compare-strip { margin-bottom: 10px; padding: 10px 12px; background: var(--bg-soft); border-radius: var(--r-sm); border: 1px dashed var(--border-2); }
.compare-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; }
.compare-tag { font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--text-faint); background: var(--bg-card); border: 1px solid var(--border); padding: 2px 7px; border-radius: 5px; }
.compare-en { font-size: 16px; color: var(--text-faint); text-decoration: line-through; text-decoration-color: rgba(127,127,127,.45); }
.compare-zh { font-size: 13px; color: var(--text-faint); width: 100%; padding-left: 52px; }
.compare-arrow { font-size: 12px; color: var(--accent); font-weight: 600; margin-top: 6px; }

.tip-line.tip-compare { padding: 10px 12px; background: var(--bg-soft); border-left: 3px solid var(--accent); }
.tip-line.tip-compare .tip-row { display: flex; gap: 8px; align-items: baseline; margin-bottom: 4px; font-size: 13px; }
.tip-line.tip-compare .tip-tag { font-size: 10px; font-weight: 700; padding: 2px 6px; border-radius: 4px; flex-shrink: 0; }
.tip-line.tip-compare .tip-book .tip-tag { background: rgba(127,127,127,.15); color: var(--text-faint); }
.tip-line.tip-compare .tip-native .tip-tag { background: var(--accent-soft); color: var(--accent); }
.tip-line.tip-compare .tip-book span:last-child { color: var(--text-faint); text-decoration: line-through; }
.tip-line.tip-compare .tip-native span:last-child { color: var(--text); font-weight: 500; }
.tip-line.tip-compare .tip-note { font-size: 12px; color: var(--text-faint); margin-top: 6px; padding-top: 6px; border-top: 1px solid var(--border); }
.tip-line.tip-highlight { border-left: 3px solid var(--amber); }

.en-line.native-en { position: relative; }
.pack-cover { font-size: 28px; }
.pack-info { min-width: 0; flex: 1; }
.pack-info strong { display: block; font-size: 14.5px; }
.pack-info small { display: block; color: var(--text-faint); font-size: 11.5px; margin: 3px 0 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pack-info .mini-bar { height: 5px; background: var(--bg-soft); border-radius: 999px; overflow: hidden; }
.pack-info .mini-fill { height: 100%; background: var(--green); }

.pack-banner { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; background: linear-gradient(var(--accent-soft), transparent), var(--bg-card); border: 1px solid var(--accent); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 18px; }
.pb-left { display: flex; align-items: center; gap: 12px; }
.pb-cover { font-size: 28px; }
.pb-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

.filters { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 6px; }
.filter-row { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; }
.filter-chip { border: 1px solid var(--border); background: transparent; color: var(--text-dim); padding: 6px 13px; border-radius: 999px; cursor: pointer; font-size: 12.5px; font-weight: 600; transition: .15s; }
.filter-chip:hover { color: var(--text); border-color: var(--border-2); }
.filter-chip.active { background: var(--accent-soft); border-color: transparent; color: var(--accent-ink); }
.filter-chip .cnt { opacity: .55; font-size: 11px; margin-left: 4px; }
.empty-hint { color: var(--text-faint); text-align: center; padding: 40px 0; }

/* 课程：内容前置的列表行 */
.lesson-grid { display: flex; flex-direction: column; margin-top: 6px; }
.lesson-card {
  display: grid; grid-template-columns: 36px 1fr 130px; gap: 16px; align-items: center;
  padding: 14px 10px; border-radius: 10px; cursor: pointer; position: relative;
  border-bottom: 1px solid var(--border); transition: background .12s var(--ease);
}
.lesson-card:hover { background: var(--bg-card); }
.lesson-card:hover h3 { color: var(--accent-ink); }
.lesson-card .cover { width: 36px; height: 36px; border-radius: 9px; display: grid; place-items: center;
  font-size: 11px; font-weight: 700; color: #fff; letter-spacing: .3px; }
.lesson-card .cover-emoji { display: none; }
.lesson-card .cover-level { display: none; }
.lesson-card[data-src="TED"] .cover { background: #7158E0; }
.lesson-card[data-src="Everyday"] .cover { background: #2BA497; }
.lesson-card[data-src="Drama"] .cover { background: #E0507A; }
.lesson-card[data-src="Business"] .cover { background: #3577E0; }
.lesson-card[data-src="News"] .cover { background: #E08A3C; }
.lesson-card[data-src="Podcast"] .cover { background: #1B97B8; }
.lesson-card[data-src="Science"] .cover { background: #1FA39A; }
.lesson-card[data-src="Tech"] .cover { background: #4A6CC0; }
.lesson-card[data-src="Travel"] .cover { background: #15A0A6; }
.lesson-card[data-src="Health"] .cover { background: #38A06A; }
.lesson-card[data-src="Culture"] .cover { background: #9B59B6; }
.lesson-card .card-body { min-width: 0; }
.lesson-card h3 { font-size: 14.5px; font-weight: 600; line-height: 1.3; transition: color .12s; }
.lesson-card .card-meta { display: flex; gap: 8px; font-size: 12px; color: var(--text-faint); align-items: center; margin-top: 3px; }
.lesson-card .card-meta .lv { font-size: 10.5px; font-weight: 700; color: var(--text-dim); background: var(--bg-inset); border-radius: 5px; padding: 1px 6px; }
.lesson-card .card-meta .dot { display: none; }
.lesson-card .lesson-progress { text-align: right; }
.lesson-card .mini-bar { height: 5px; background: var(--bg-inset); border-radius: var(--r-full); overflow: hidden; }
.lesson-card .mini-fill { height: 100%; background: var(--green); border-radius: inherit; transition: width .4s var(--ease); }
.lesson-card.completed .mini-fill { background: var(--accent); }
.lesson-card .mini-text { font-size: 11px; color: var(--text-faint); margin-top: 5px; font-weight: 600; }
.lesson-card.completed .mini-text { color: var(--accent-ink); }

.pill { display: inline-flex; align-items: center; font-size: 12px; padding: 3px 9px; border-radius: 999px; background: var(--bg-soft); color: var(--text-dim); border: 1px solid var(--border); }
.pill.level-A2 { color: var(--green); border-color: var(--green); }
.pill.level-B1 { color: var(--accent); border-color: var(--accent); }
.pill.level-B2 { color: var(--amber); border-color: var(--amber); }
.pill.level-C1 { color: var(--red); border-color: var(--red); }

/* ---------- 单课工具栏 ---------- */
.lesson-toolbar {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 12px 0 16px; border-bottom: 1px solid var(--border); margin-bottom: 18px;
}
.lesson-meta { flex: 1; min-width: 180px; }
.lesson-meta h2 { font-size: 20px; }
.lesson-meta .sub { color: var(--text-faint); font-size: 13px; margin-top: 3px; display: flex; gap: 8px; align-items: center; }
.toolbar-controls { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }

.speed-group { display: flex; align-items: center; gap: 4px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 999px; padding: 4px; }
.speed-group .lbl { font-size: 12px; color: var(--text-faint); padding: 0 6px; }
.speed-group button { border: 0; background: transparent; color: var(--text-dim); padding: 6px 11px; border-radius: 999px; cursor: pointer; font-size: 13px; }
.speed-group button.active { background: var(--accent); color: #fff; }

.switch { display: flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-dim); cursor: pointer; user-select: none; }
.switch input { width: 16px; height: 16px; accent-color: var(--accent); }

/* ---------- 进度条 ---------- */
.progress-bar { position: relative; height: 8px; background: var(--bg-soft); border-radius: 999px; margin-bottom: 22px; }
.progress-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--green), #4fe0b0); border-radius: 999px; transition: width .3s; }
.progress-text { position: absolute; right: 0; top: 12px; font-size: 12px; color: var(--text-faint); }

/* ---------- 句子卡片 ---------- */
.sentence-list { display: flex; flex-direction: column; gap: 14px; }
.sentence {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: 18px 18px 14px; transition: box-shadow .2s var(--ease), opacity .2s var(--ease), background .2s var(--ease);
}
/* 当前句：左蓝脊 + 提亮（克制，不整圈描边） */
.sentence.playing { background: var(--bg-card-hover); box-shadow: inset 4px 0 0 var(--accent), var(--sh-2); }
/* 已掌握：左绿脊 + 降饱和，把注意力推向未练的句 */
.sentence.mastered { box-shadow: inset 4px 0 0 var(--green); opacity: .68; }
.sentence.mastered:hover { opacity: 1; }
.sentence .idx { font-size: 12px; color: var(--text-faint); margin-bottom: 8px; }
.speaker-tag { display: inline-block; font-size: 10px; font-weight: 700; padding: 1px 6px; border-radius: 4px; background: var(--accent-soft); color: var(--accent); margin-right: 4px; }

.en-line { font-size: 19px; line-height: 1.6; }
.en-line .word { cursor: pointer; border-radius: 5px; padding: 1px 1px; transition: .1s; }
.en-line .word:hover { background: var(--accent-soft); }
.en-line .word.speaking { background: var(--accent); color: #fff; }

.zh-line { color: var(--text-dim); font-size: 15px; margin-top: 8px; line-height: 1.5; }
.zh-line.hidden { display: none; }
.tip-line { color: var(--text-dim); font-size: 13px; margin-top: 6px; line-height: 1.5; padding: 6px 10px; background: var(--card-2, rgba(127,127,127,.08)); border-radius: 8px; }

.sentence-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--border);
  background: var(--bg-soft); color: var(--text); padding: 8px 14px; border-radius: var(--r-sm);
  cursor: pointer; font-size: 13.5px; transition: transform .15s var(--ease), background .15s, border-color .15s, box-shadow .15s;
}
.btn:hover { background: var(--bg-card-hover); border-color: var(--border-2); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
/* 主操作：听 */
.btn.primary { background: var(--accent); border-color: transparent; color: #fff; padding: 9px 20px; font-weight: 600; box-shadow: var(--sh-1); }
.btn.primary:hover { transform: translateY(-1px); box-shadow: var(--glow-accent); }
.sentence.playing .act-listen { animation: playGlow 1.5s var(--ease) infinite; }
@keyframes playGlow { 0%,100% { box-shadow: 0 0 0 0 rgba(79,157,255,.5); } 50% { box-shadow: 0 0 0 8px rgba(79,157,255,0); } }
/* 次操作：录音 / 测评 */
.btn.secondary { background: var(--bg-inset); border-color: var(--border); color: var(--text); }
.btn.secondary:hover { background: var(--bg-card-hover); border-color: var(--border-2); }
/* 纯图标按钮：循环 / 更多 */
.btn.icon-only { width: 38px; height: 38px; padding: 0; justify-content: center; color: var(--text-dim); font-size: 16px; }
.btn.rec.recording { background: var(--red); border-color: var(--red); color: #fff; animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .55; } }
.btn.loop.looping { background: var(--accent); border-color: var(--accent); color: #fff; animation: pulse 1.2s infinite; }

/* 已掌握（行内常驻） */
.btn.done.on { background: var(--green-soft); border-color: transparent; color: var(--green); }
/* ⋯ 更多菜单 */
.sentence-actions .more-wrap { margin-left: auto; }
.more-wrap { position: relative; }
.more-menu { position: absolute; right: 0; top: 44px; z-index: 30; min-width: 150px;
  background: var(--bg-card-hover); border: 1px solid var(--border-2); border-radius: var(--r-sm);
  box-shadow: var(--sh-3); padding: 6px; display: flex; flex-direction: column; gap: 2px; animation: menuIn .15s var(--ease); }
.more-menu[hidden] { display: none; }
@keyframes menuIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
.more-menu .mm { display: flex; align-items: center; gap: 8px; border: 0; background: transparent; color: var(--text);
  padding: 9px 11px; border-radius: var(--r-xs); cursor: pointer; font-size: 13.5px; text-align: left; }
.more-menu .mm:hover { background: var(--bg-soft); }
.more-menu .mm.on { color: var(--green); }
.more-menu .mm.save.on { color: var(--amber); }

/* 盲跟读：模糊英文，悬停可偷看 */
.en-line.blurred .word, .en-line.blurred { filter: blur(7px); opacity: .45; transition: .15s; cursor: default; }
.en-line.blurred:hover, .en-line.blurred:hover .word,
.en-line.blurred.peek, .en-line.blurred.peek .word { filter: none; opacity: 1; }

.score-note { margin-top: 10px; font-size: 11.5px; line-height: 1.5; }

/* 键盘焦点可见 + 卡片可聚焦 */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.lesson-card:focus-visible, .pack-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* 打卡：右栏面板里的连胜 + 7 格周历 */
.streak-flame { display: flex; align-items: baseline; gap: 8px; margin-bottom: 13px; }
.streak-flame .num { font-size: 32px; font-weight: 800; letter-spacing: -1px; line-height: 1; }
.streak-flame .flame-lbl { font-size: 12.5px; color: var(--text-dim); }
.streak-flame .flame-ico { display: none; }
.streak-week { display: flex; gap: 6px; }
.day-dot { flex: 1; aspect-ratio: 1; border-radius: var(--r-xs); display: grid; place-items: center;
  font-size: 10px; font-weight: 600; background: var(--bg-inset); color: var(--text-faint); border: 1px solid transparent; transition: .2s var(--ease); }
.day-dot.done { background: var(--green); color: #fff; }
.day-dot.today { box-shadow: inset 0 0 0 2px var(--accent); color: var(--accent); }
.streak-goal-head { font-size: 11.5px; color: var(--text-dim); margin-top: 10px; }

/* 一键续练：克制横条 */
.resume-bar { display: flex; align-items: center; gap: 15px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: 15px 18px; margin-bottom: 22px; box-shadow: var(--sh-1); }
.resume-info { display: flex; align-items: center; gap: 13px; min-width: 0; flex: 1; }
.resume-info strong { color: var(--text); font-size: 15.5px; font-weight: 700; display: block; }
.resume-info .resume-kick { font-size: 11px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; color: var(--accent); margin-bottom: 2px; }
.resume-icon { font-size: 18px; width: 44px; height: 44px; display: grid; place-items: center; border-radius: var(--r-sm);
  background: var(--accent); color: #fff; flex: none; }
.resume-go { white-space: nowrap; background: var(--accent); color: #fff; border: 0; font-weight: 600;
  padding: 10px 18px; border-radius: var(--r-sm); cursor: pointer; transition: background .15s; }
.resume-go:hover { background: var(--accent-ink); }
.sentence.resume-flash { animation: resumeFlash 1.6s ease; }
@keyframes resumeFlash { 0%,100% { box-shadow: none; } 20% { box-shadow: 0 0 0 2px var(--accent); } }

/* 新手三步引导条 */
.coach-strip { position: relative; background: linear-gradient(rgba(245,177,76,.12), transparent), var(--bg-card);
  border: 1px dashed var(--amber); border-radius: var(--radius); padding: 14px 18px; margin-bottom: 14px; }
.coach-strip strong { display: block; margin-bottom: 8px; }
.coach-steps { margin: 0 0 6px 0; padding-left: 20px; display: flex; flex-direction: column; gap: 4px; font-size: 13.5px; color: var(--text-dim); }
.coach-steps b { color: var(--text); }
.coach-x { position: absolute; top: 10px; right: 12px; background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 14px; }

/* 低分自动入复习提示 */
.score-auto { margin-top: 8px; font-size: 12.5px; color: var(--accent, #8fb0ff); }

/* 庆祝 toast */
.celebrate-toast { position: fixed; left: 50%; bottom: 40px; transform: translate(-50%, 30px); opacity: 0;
  background: var(--bg-card); border: 1px solid var(--amber); color: var(--text); padding: 12px 20px; border-radius: 999px;
  font-weight: 600; box-shadow: 0 10px 40px rgba(0,0,0,.4); z-index: 9999; transition: opacity .35s, transform .35s; pointer-events: none; }
.celebrate-toast.show { opacity: 1; transform: translate(-50%, 0); }
.celebrate-toast .ct-emoji { margin-right: 4px; }
@media (prefers-reduced-motion: reduce) { .sentence.resume-flash, .celebrate-toast { animation: none; transition: opacity .2s; } }

/* 打分：重点纠正 + 操作 */
.score-focus { margin-top: 10px; font-size: 13.5px; color: var(--amber); background: rgba(245,177,76,.1); border: 1px solid rgba(245,177,76,.3); border-radius: 8px; padding: 8px 11px; }
.score-focus.ok-focus { color: var(--green); background: var(--green-soft); border-color: rgba(56,211,159,.3); }
.score-actions { margin-top: 10px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.btn.score { color: var(--text-dim); }
.btn.score:hover { border-color: var(--green); }
.btn.score.scoring { background: var(--green); border-color: var(--green); color: #06231a; animation: pulse 1s infinite; }

/* 评分结果面板 */
.score-panel { display: none; margin-top: 12px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.score-panel.show { display: block; }
.score-msg { font-size: 14px; color: var(--text-dim); display: flex; align-items: center; gap: 8px; }
.score-msg.err { color: var(--amber); }
.rec-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--green); animation: pulse 1s infinite; }
.score-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 10px; }
.score-num { font-size: 30px; font-weight: 700; line-height: 1; }
.score-num small { font-size: 13px; font-weight: 400; margin-left: 2px; }
.score-num.good, .score-grade.good { color: var(--green); }
.score-num.mid, .score-grade.mid { color: var(--amber); }
.score-num.low, .score-grade.low { color: var(--red); }
.score-grade { font-size: 14px; padding: 2px 10px; border: 1px solid currentColor; border-radius: 999px; }
.score-stat { font-size: 12.5px; color: var(--text-faint); margin-left: auto; }
.score-words { font-size: 17px; line-height: 1.9; }
.sw { padding: 1px 6px; border-radius: 5px; }
.sw.ok { background: var(--green-soft); color: var(--green); }
.sw.sub { background: rgba(245,177,76,.16); color: var(--amber); }
.sw.miss { background: rgba(255,107,107,.16); color: var(--red); text-decoration: line-through; }
.score-heard { margin-top: 10px; font-size: 13px; color: var(--text-faint); }
.score-legend { margin-top: 10px; display: flex; gap: 8px; font-size: 11px; }
.score-legend .sw { padding: 1px 8px; }

.rec-playback { margin-top: 12px; display: none; flex-direction: column; gap: 10px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; padding: 12px; }
.rec-playback.show { display: flex; }
.rec-playback audio { height: 34px; }
.wave-area { display: flex; flex-direction: column; gap: 6px; }
.wave-row { display: flex; align-items: center; gap: 10px; }
.wave-label { font-size: 11px; color: var(--green); width: 28px; flex: 0 0 28px; text-align: right; }
.wave-label.you { color: var(--accent); }
.wave { flex: 1; height: 40px; width: 100%; background: rgba(255,255,255,.02); border-radius: 6px; }
.rec-controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

/* ---------- 词级掘句 ---------- */
.word.mined { border-bottom: 2px dotted var(--amber); }
.word-pop { position: fixed; z-index: 70; display: flex; flex-direction: column; gap: 6px; width: 320px; max-width: 92vw; background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 8px; box-shadow: var(--shadow); }
.wp-head { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.wp-word { font-size: 15px; font-weight: 600; padding: 0 4px; }
.wp-btn { border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); border-radius: 8px; padding: 5px 9px; font-size: 12.5px; cursor: pointer; }
.wp-btn:hover { background: var(--bg-card-hover); }
.wp-examples { max-height: 240px; overflow-y: auto; border-top: 1px solid var(--border); padding-top: 8px; display: flex; flex-direction: column; gap: 8px; }
.wp-ex-row { cursor: pointer; padding: 6px 8px; border-radius: 8px; background: var(--bg-soft); }
.wp-ex-row:hover { background: var(--bg-card-hover); }
.wp-ex-en { font-size: 13.5px; line-height: 1.5; }
.wp-ex-en .hw, .rv-ex .hw { color: var(--amber); }
.wp-ex-zh { font-size: 12px; color: var(--text-dim); margin-top: 3px; }
.rv-ex { margin-top: 12px; display: flex; flex-direction: column; gap: 6px; }
.rv-ex-row { font-size: 14px; line-height: 1.5; cursor: pointer; padding: 6px 8px; border-radius: 8px; background: var(--bg-soft); }
.rv-ex-row:hover { background: var(--bg-card-hover); }

/* ---------- 学习进度 ---------- */
.stats-wrap { max-width: 720px; margin: 0 auto; padding: 6px 0 50px; }
.stats-wrap h1 { font-size: 26px; margin-bottom: 18px; }
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat-cell { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; text-align: center; }
.stat-num { font-size: 26px; font-weight: 700; }
.stat-num.good { color: var(--green); } .stat-num.amber { color: var(--amber); }
.stat-label { font-size: 12.5px; color: var(--text-faint); margin-top: 6px; }
.stat-section { margin-top: 26px; }
.stat-section h2 { font-size: 17px; margin-bottom: 12px; }
.day-bars { display: flex; align-items: flex-end; gap: 5px; height: 90px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.day-bar { flex: 1; height: 100%; display: flex; align-items: flex-end; }
.day-fill { width: 100%; min-height: 2px; background: linear-gradient(var(--accent), #4fe0b0); border-radius: 3px; transition: height .3s; }
.src-list { display: flex; flex-direction: column; gap: 6px; }
.src-row { display: flex; justify-content: space-between; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 9px 13px; font-size: 14px; }
.src-n { color: var(--green); }
.backup-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.err-list { display: flex; flex-wrap: wrap; gap: 8px; }
.err-chip { border: 1px solid rgba(255,107,107,.35); background: rgba(255,107,107,.08); color: var(--text); border-radius: 999px; padding: 6px 12px; font-size: 13.5px; cursor: pointer; transition: .15s; }
.err-chip:hover { background: rgba(255,107,107,.16); }
.err-chip span { color: var(--red); font-size: 12px; margin-left: 3px; }
.again-tag { color: var(--red); font-size: 11px; margin-left: 4px; background: rgba(255,107,107,.14); border-radius: 6px; padding: 1px 5px; }
@media (max-width: 520px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 复习 / SRS ---------- */
.tab { position: relative; }
.tab-badge { display: inline-flex; align-items: center; justify-content: center; min-width: 17px; height: 17px; padding: 0 4px; margin-left: 5px; font-size: 10.5px; border-radius: 999px; background: var(--amber); color: #2a1c00; font-weight: 700; vertical-align: middle; }
.btn.save { color: var(--text-dim); }
.btn.save.on { background: var(--amber); border-color: var(--amber); color: #2a1c00; }

.review-hub { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); padding: 17px; box-shadow: var(--sh-1); }
.rh-top { display: flex; align-items: baseline; gap: 9px; margin-bottom: 12px; }
.rh-num { font-size: 28px; font-weight: 800; color: var(--green); letter-spacing: -1px; line-height: 1; }
.rh-sub { font-size: 12px; color: var(--text-dim); }
.rh-go { width: 100%; background: var(--green-soft); color: var(--green); border: 0; font-weight: 700; font-size: 13.5px; border-radius: var(--r-sm); padding: 10px; cursor: pointer; }
.rh-go:disabled { opacity: .6; cursor: default; }
.rh-left { display: flex; align-items: center; gap: 12px; }
.rh-icon { font-size: 22px; }

.review-wrap { max-width: 640px; margin: 0 auto; padding: 10px 0 40px; }
.review-empty { text-align: center; padding: 60px 16px; }
.review-empty .re-icon { font-size: 48px; }
.review-empty h2 { font-size: 22px; margin: 14px 0 8px; }
.review-empty p { line-height: 1.7; }
.re-actions { display: flex; gap: 10px; justify-content: center; margin-top: 20px; }
.review-empty .primary, .review-empty .ghost { margin-top: 22px; }

.review-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.rv-progress { font-size: 13px; color: var(--text-faint); }
.review-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.rv-kind { font-size: 12px; color: var(--text-faint); margin-bottom: 14px; }
.rv-mode { font-size: 12.5px; color: var(--accent); margin-bottom: 14px; }
.rv-zh { font-size: 21px; line-height: 1.5; }
.rv-zh-sm { font-size: 14px; margin-top: 8px; }
.rv-en { font-size: 22px; line-height: 1.6; }
.rv-input { width: 100%; margin-top: 12px; background: var(--bg-soft); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 11px 13px; font-size: 16px; font-family: inherit; resize: vertical; }
.rv-input:focus { outline: none; border-color: var(--accent); }
.rv-reveal { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border); }
.rv-en-full { font-size: 21px; line-height: 1.6; }
.rv-zh-full { font-size: 15px; margin-top: 8px; }
.rv-diff { margin-top: 12px; font-size: 15px; line-height: 1.9; }
.rv-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }
.rv-grade { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 16px; }
.rv-grade button { flex-direction: column; padding: 10px 6px; font-size: 13.5px; }
.rv-grade button small { display: block; font-size: 10px; opacity: .7; margin-top: 2px; }
.grade-again { color: var(--red); border-color: rgba(255,107,107,.4); }
.grade-hard { color: var(--amber); }
.grade-good { color: var(--green); }
.grade-easy { color: var(--accent); }
.rv-grade button:hover { background: var(--bg-card-hover); }

@media (max-width: 520px) { .rv-grade { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 每课练习 ---------- */
.lesson-practice { background: linear-gradient(var(--accent-soft), transparent), var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-top: 6px; }
.lesson-practice h3 { font-size: 17px; }
.practice-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.practice-body { margin-top: 14px; }
.quiz { display: flex; flex-direction: column; gap: 6px; font-size: 14.5px; line-height: 1.6; }
.quiz-q { color: var(--text); font-weight: 600; margin-top: 6px; }
.quiz-a { color: var(--green); }
/* 本课测验 MCQ */
.quiz-q-head { font-size: 12.5px; color: var(--accent); margin-bottom: 10px; }
.quiz-prompt { font-size: 18px; line-height: 1.5; margin: 10px 0; }
.quiz-opts { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.quiz-opt { text-align: left; border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); border-radius: 10px; padding: 11px 14px; font-size: 14.5px; cursor: pointer; transition: .12s; }
.quiz-opt:hover:not(:disabled) { background: var(--bg-card-hover); border-color: var(--border-2); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.correct { background: var(--green-soft); border-color: var(--green); color: var(--green); }
.quiz-opt.wrong { background: rgba(255,107,107,.12); border-color: var(--red); color: var(--red); }
.quiz-done { text-align: center; padding: 16px; }
.qd-score { font-size: 40px; font-weight: 700; }
.qd-score small { font-size: 20px; font-weight: 400; opacity: .6; }
.qd-score.good { color: var(--green); } .qd-score.mid { color: var(--amber); } .qd-score.low { color: var(--red); }
.quiz-done-actions { display: flex; gap: 10px; justify-content: center; margin-top: 16px; flex-wrap: wrap; }

.spoiler { filter: blur(5px); cursor: pointer; transition: .15s; border-radius: 4px; }
.spoiler:hover { filter: blur(3px); }
.spoiler.reveal { filter: none; }

/* ---------- 产出训练 ---------- */
.output-wrap { max-width: 680px; margin: 0 auto; padding: 6px 0 50px; }
.output-wrap h1 { font-size: 26px; margin-bottom: 8px; }
.out-back { margin-bottom: 14px; }
.out-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 20px; }
.out-card { text-align: left; display: flex; flex-direction: column; gap: 6px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; cursor: pointer; transition: .15s; }
.out-card:hover { background: var(--bg-card-hover); border-color: var(--accent); transform: translateY(-2px); }
.oc-icon { font-size: 32px; }
.out-card strong { font-size: 17px; }
.scen-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin-top: 18px; }
.scen-chip { background: var(--bg-card); border: 1px solid var(--border); color: var(--text); border-radius: 12px; padding: 16px 12px; font-size: 14.5px; cursor: pointer; transition: .15s; }
.scen-chip:hover { background: var(--bg-card-hover); border-color: var(--accent); }
.wr-genres { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0 12px; }
.wr-genre { border: 1px solid var(--border); background: var(--bg-soft); color: var(--text-dim); padding: 7px 14px; border-radius: 999px; cursor: pointer; font-size: 13.5px; }
.wr-genre.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.wr-topic, .wr-text { width: 100%; background: var(--bg-soft); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 11px 13px; font-size: 15px; font-family: inherit; }
.wr-topic { margin-bottom: 10px; }
.wr-text { line-height: 1.6; resize: vertical; }
.wr-actions { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.wr-result { margin-top: 18px; }
.wr-feedback { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 18px; font-size: 14.5px; line-height: 1.7; }
.fb-h { font-size: 15px; color: var(--accent); margin: 14px 0 6px; }
.fb-h:first-child { margin-top: 0; }
#aiMic.listening { background: var(--red); border-color: var(--red); color: #fff; animation: pulse 1s infinite; }
#exMic.listening { background: var(--red); border-color: var(--red); color: #fff; animation: pulse 1s infinite; }

/* 考试模拟 */
.exam-pick { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 18px; }
.exam-top { display: flex; align-items: center; justify-content: space-between; margin: 14px 0; }
.exam-tag { font-size: 13px; color: var(--accent); border: 1px solid var(--accent); border-radius: 999px; padding: 4px 12px; }
.exam-clock { font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--text); }
.exam-clock.go { color: var(--green); }
.exam-clock.up { color: var(--red); }
.exam-prompt { background: var(--bg-card); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 10px; padding: 14px 16px; font-size: 16px; line-height: 1.6; margin-bottom: 8px; }
@media (max-width: 520px) { .out-cards, .exam-pick { grid-template-columns: 1fr; } }

/* ---------- 导入素材 ---------- */
.import-wrap { padding: 16px 4px; }
.import-wrap h1 { font-size: 26px; }
.import-wrap > p { color: var(--text-dim); margin: 10px 0 22px; font-size: 14.5px; line-height: 1.6; }
.muted { color: var(--text-dim); }
code { background: var(--bg-soft); padding: 2px 6px; border-radius: 6px; font-size: 13px; color: var(--accent); }

.import-form { display: flex; flex-direction: column; gap: 12px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.import-row { display: flex; gap: 12px; }
.import-row select { flex: 0 0 130px; }
.import-row input { flex: 1; }
.import-form input, .import-form select, .import-form textarea {
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 11px 13px; font-size: 14px; font-family: inherit; width: 100%;
}
.import-form textarea { resize: vertical; line-height: 1.6; }
.import-form input:focus, .import-form textarea:focus, .import-form select:focus { outline: none; border-color: var(--accent); }
.import-actions { display: flex; gap: 10px; }

.import-result { margin-top: 24px; }
.import-result-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.import-result-head h2 { font-size: 19px; }
.import-result-head > div { display: flex; gap: 10px; }
.preview-list { display: flex; flex-direction: column; gap: 8px; }
.preview-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.preview-item .pi-en { font-size: 15px; }
.preview-item .pi-meta { display: flex; gap: 8px; align-items: center; margin-top: 6px; }

.json-box { margin-top: 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.json-box summary { cursor: pointer; color: var(--text-dim); font-size: 14px; }
.json-box pre { margin-top: 12px; max-height: 360px; overflow: auto; font-size: 12.5px; color: var(--text-dim); white-space: pre-wrap; word-break: break-word; }

.ghost { border: 1px solid var(--border); background: transparent; color: var(--text-dim); padding: 8px 14px; border-radius: 10px; cursor: pointer; font-size: 14px; transition: .15s; }
.ghost:hover { color: var(--text); border-color: var(--border-2); }
.primary { border: 0; background: var(--accent); color: #fff; padding: 9px 16px; border-radius: 10px; cursor: pointer; font-size: 14px; transition: .15s; }
.primary:hover { background: #3d8bf0; }

/* ---------- 图标按钮 ---------- */
.icon-btn { border: 1px solid var(--border); background: var(--bg-soft); color: var(--text); width: 38px; height: 38px; border-radius: 10px; cursor: pointer; font-size: 16px; transition: .15s; }
.icon-btn:hover { background: var(--bg-card-hover); border-color: var(--border-2); }
#installBtn { width: auto; padding: 0 12px; font-size: 13px; color: var(--green); border-color: var(--green); }
.topbar { gap: 10px; }

/* ---------- 句子上的 AI 按钮 ---------- */
.btn.ai { color: var(--text-dim); }
.btn.ai:hover { border-color: #7a5cff; color: #c08bff; }

/* ---------- 设置弹窗 ---------- */
.modal { position: fixed; inset: 0; z-index: 60; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,.55); backdrop-filter: blur(3px); padding: 20px; }
.modal[hidden] { display: none; }
.modal-card { width: 100%; max-width: 460px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); animation: fade .2s ease; }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.modal-head h2 { font-size: 19px; }
.small { font-size: 12.5px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-top: 14px; font-size: 13px; color: var(--text-dim); }
.field input, .field select { background: var(--bg-soft); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 10px 12px; font-size: 14px; font-family: inherit; }
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }
.modal-actions { display: flex; align-items: center; gap: 10px; margin-top: 20px; }
/* onboarding 选项 */
.ob-q { margin-top: 16px; }
.ob-label { font-size: 13px; color: var(--text-dim); margin-bottom: 8px; }
.ob-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.ob-opts button { border: 1px solid var(--border); background: var(--bg-soft); color: var(--text-dim); padding: 8px 14px; border-radius: 999px; cursor: pointer; font-size: 13.5px; transition: .15s; }
.ob-opts button:hover { color: var(--text); border-color: var(--border-2); }
.ob-opts button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
#setStatus.ok { color: var(--green); }
#setStatus.err { color: var(--red); }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; padding: 0; font: inherit; text-decoration: underline; }

/* ---------- AI 导师抽屉 ---------- */
.ai-backdrop { position: fixed; inset: 0; z-index: 49; background: rgba(0,0,0,.4); }
.ai-drawer {
  position: fixed; top: 0; right: 0; height: 100vh; width: 400px; max-width: 92vw; z-index: 50;
  background: var(--bg-soft); border-left: 1px solid var(--border); box-shadow: var(--shadow);
  display: flex; flex-direction: column; transform: translateX(105%); transition: transform .25s ease;
}
.ai-drawer.open { transform: none; }
.ai-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-bottom: 1px solid var(--border); }
.ai-head strong { font-size: 16px; }
.ai-head small { display: block; font-size: 11px; margin-top: 2px; }
.ai-context { margin: 14px 18px 0; padding: 10px 12px; background: var(--accent-soft); border: 1px solid var(--accent); border-radius: 10px; font-size: 14px; line-height: 1.5; }
.ai-quick { display: flex; flex-wrap: wrap; gap: 8px; padding: 14px 18px 4px; }
.chip { border: 1px solid var(--border); background: var(--bg-card); color: var(--text-dim); padding: 6px 12px; border-radius: 999px; cursor: pointer; font-size: 12.5px; transition: .15s; }
.chip:hover { color: var(--text); border-color: #7a5cff; }
.ai-messages { flex: 1; overflow-y: auto; padding: 14px 18px; display: flex; flex-direction: column; gap: 12px; }
.ai-msg { font-size: 14px; line-height: 1.6; border-radius: 12px; padding: 11px 13px; max-width: 92%; white-space: pre-wrap; word-break: break-word; }
.ai-msg.user { align-self: flex-end; background: var(--accent); color: #fff; border-bottom-right-radius: 4px; }
.ai-msg.assistant { align-self: flex-start; background: var(--bg-card); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.ai-msg.assistant.thinking { color: var(--text-faint); font-style: italic; }
.ai-msg .speak-ex { display: inline-flex; align-items: center; gap: 4px; margin-left: 6px; font-size: 11px; color: var(--accent); cursor: pointer; border: 1px solid var(--border); border-radius: 6px; padding: 0 5px; }
.ai-input { display: flex; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--border); align-items: flex-end; }
.ai-input textarea { flex: 1; background: var(--bg-card); border: 1px solid var(--border); color: var(--text); border-radius: 10px; padding: 9px 11px; font-size: 14px; font-family: inherit; resize: none; max-height: 120px; }
.ai-input textarea:focus { outline: none; border-color: var(--accent); }
.ai-nokey { padding: 16px 18px; font-size: 13.5px; color: var(--text-dim); line-height: 1.6; }

@media (max-width: 480px) {
  .ai-drawer { width: 100vw; max-width: 100vw; }
}

/* ---------- 底栏 ---------- */
.footbar { display: flex; justify-content: space-between; align-items: center; margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-faint); flex-wrap: wrap; gap: 8px; }

/* ---------- 移动端底部导航 ---------- */
.bottom-nav { display: none; }
@media (max-width: 720px) {
  .bottom-nav {
    display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
    background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(14px);
    border-top: 1px solid var(--border); padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  }
  .bnav-item { flex: 1; position: relative; display: flex; flex-direction: column; align-items: center; gap: 2px;
    background: none; border: 0; color: var(--text-faint); cursor: pointer; padding: 6px 2px; font-size: 11px; transition: color .15s; }
  .bnav-item .bn-ico { font-size: 20px; filter: grayscale(.4); opacity: .7; transition: .15s; }
  .bnav-item.active { color: var(--accent); }
  .bnav-item.active .bn-ico { filter: none; opacity: 1; transform: translateY(-1px); }
  .bn-badge { position: absolute; top: 0; right: 50%; margin-right: -22px; min-width: 16px; height: 16px; padding: 0 4px;
    font-size: 10px; line-height: 16px; border-radius: 999px; background: var(--amber); color: #2a1c00; font-weight: 700; }
  /* 顶栏在手机上隐藏文字 tab，避免溢出；底部导航接管 */
  .topbar .tabs { display: none; }
  #main { padding-bottom: 70px; }
}

@media (max-width: 600px) {
  .hero { padding: 14px 2px 18px; }
  .hero h1 { font-size: 23px; }
  .en-line { font-size: 17px; }
  .toolbar-controls { width: 100%; justify-content: flex-start; }
  .import-row { flex-direction: column; }
  /* 触控区 ≥44px */
  .btn { min-height: 42px; }
  .sentence-actions { gap: 6px; }
}

/* ---------- 视图切换 + 进度流光（微动效） ---------- */
.view.active { animation: viewIn .3s var(--ease); }
@keyframes viewIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.progress-fill { position: relative; overflow: hidden; }
.progress-fill::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.35), transparent);
  transform: translateX(-100%); animation: shimmer 1.4s var(--ease) .2s 1; }
@keyframes shimmer { to { transform: translateX(100%); } }

/* ---------- 新 Web 布局：响应式 ---------- */
@media (max-width: 980px) {
  .lib-grid { grid-template-columns: 1fr; }
  .rail { position: static; flex-direction: row; flex-wrap: wrap; }
  .rail > .panel, .rail > .review-hub { flex: 1; min-width: 230px; }
}
@media (max-width: 720px) {
  .topbar { padding: 0 16px; gap: 12px; height: 56px; }
  .topbar::before { height: 56px; }
  .topbar .search { width: auto; flex: 1; min-width: 0; }
  #main { padding: 18px 16px 84px; }
  .lesson-card { grid-template-columns: 34px 1fr 84px; gap: 12px; }
}