*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB',sans-serif;background:#f5f6fa;color:#222;max-width:480px;margin:0 auto;min-height:100vh;-webkit-tap-highlight-color:transparent;overflow:hidden;display:flex;flex-direction:column;height:100vh}
body.dark{background:#1a1a2e;color:#ddd}
#app-content{display:flex;flex-direction:column;flex:1;min-height:0}
body.dark .top-bar,body.dark .bottom-nav{background:#16213e}
body.dark .word-card,body.dark .example-block,body.dark .stats-panel{background:#1e2a4a}
body.dark .modal-card{background:#1e2a4a;color:#ddd}
body.dark select,body.dark input{background:#2a3a5c;color:#ccc;border-color:#3a4a6c}
body.dark .btn-top{background:#2a3a5c}
body.dark .hint-text,body.dark .word-trans,body.dark .word-py,body.dark .example-py,body.dark .example-zh,body.dark .stat-label,body.dark .progress-label{color:#999}
body.dark .section-header{color:#ccc}
body.dark .pronounce-block{background:#1e2a4a}
body.dark .pronounce-item{background:#2a3a5c;color:#ccc}
body.dark .pronounce-item.py-active{background:#1e3a5e;color:#8ab4f8}
body.dark .song-item{background:#1e2a4a}
body.dark .song-item .song-title{color:#ddd}
body.dark .song-difficulty{color:#fbbf24}
body.dark .song-title-id-line{color:#aaa}
body.dark .special-card{background:#2a3a5c;color:#ccc}

/* ===== Top Bar ===== */
.top-bar{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#fff;flex-shrink:0}
.top-left{display:flex;align-items:center;gap:10px}
.logo{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;overflow:hidden}
.top-title-wrap{display:flex;flex-direction:column;line-height:1.2}
.top-title{font-size:16px;font-weight:700;color:#1a1a2e}
body.dark .top-title{color:#eee}
.top-sub{font-size:10px;color:#999}
.top-actions{display:flex;gap:6px}
.btn-top{border:none;border-radius:16px;padding:6px 14px;font-size:12px;cursor:pointer;font-weight:500}

/* ===== Bilingual small text ===== */
.section-tab small, .section-header small, .btn-action small, .nav-label small,
.ck-period-btn small, .btn-outline small, .btn-primary small, .btn-song-play small,
.btn-song-tts small, .btn-example-read small, .song-detail-back small, .ck-back-btn small,
.modal-header small, .top-title small, .hint-text small, .progress-label small,
.stat-label small, .checkin-stat-label small, .lb-dept-header small,
.checkin-detail-streak small, .checkin-today-flag small, .btn-top small,
.example-title small, .song-lyric-title small, .special-cat-title small,
.btn-practice small, .btn-speak small {
  font-size:10px; font-weight:400; opacity:0.7; display:inline;
}
body.dark .section-tab small, body.dark .section-header small, body.dark .btn-action small,
body.dark .nav-label small, body.dark .ck-period-btn small, body.dark .btn-outline small,
body.dark .btn-primary small, body.dark .btn-song-play small, body.dark .btn-song-tts small,
body.dark .btn-example-read small, body.dark .song-detail-back small, body.dark .ck-back-btn small,
body.dark .modal-header small, body.dark .top-title small, body.dark .hint-text small,
body.dark .progress-label small, body.dark .stat-label small, body.dark .checkin-stat-label small,
body.dark .lb-dept-header small, body.dark .checkin-detail-streak small,
body.dark .checkin-today-flag small, body.dark .btn-top small, body.dark .example-title small,
body.dark .song-lyric-title small, body.dark .special-cat-title small,
body.dark .btn-practice small, body.dark .btn-speak small {
  opacity:0.6;
}

/* ===== 用户信息栏 ===== */
.user-info-bar{display:flex;align-items:center;justify-content:center;padding:5px 14px;background:#f0f4ff;flex-shrink:0;font-size:13px;color:#4A90D9;font-weight:600;min-height:18px}
.user-info-bar:empty,#user-info-bar.hidden-bar{display:none}
body.dark .user-info-bar{background:#16213e;color:#8ab4f8}

/* ===== 四大板块Tab ===== */
.section-tabs{display:flex;background:#fff;padding:4px 8px;gap:4px;flex-shrink:0;border-bottom:1px solid #eee;overflow-x:auto;-webkit-overflow-scrolling:touch}
body.dark .section-tabs{background:#16213e;border-color:#2a3a5c}
.section-tab{flex:1;min-width:fit-content;text-align:center;padding:8px 6px;font-size:12px;font-weight:500;color:#888;cursor:pointer;border-radius:10px;transition:all .2s;white-space:nowrap}
.section-tab.active{background:#e8f4fd;color:#4A90D9;font-weight:700}
body.dark .section-tab{color:#888}
body.dark .section-tab.active{background:#1e3a5e;color:#8ab4f8}

/* ===== Main Scroll ===== */
.main-scroll{flex:1;overflow-y:auto;padding:0 14px;-webkit-overflow-scrolling:touch}

/* ===== Section Panel ===== */
.section-header{font-size:16px;font-weight:700;color:#1a1a2e;padding:12px 0 8px}

/* ===== 发音学习 ===== */
.pronounce-grid{display:flex;gap:10px}
.pronounce-block{background:#fff;border-radius:14px;padding:12px;margin-top:8px;box-shadow:0 2px 8px rgba(0,0,0,.04);flex:1}
.pronounce-block-title{font-size:13px;font-weight:700;color:#4A90D9;margin-bottom:8px}
.pronounce-block-title small{font-weight:400;font-size:11px;color:#999}
.pronounce-items{display:flex;flex-wrap:wrap;gap:6px}
.pronounce-item{padding:6px 10px;background:#f0f4ff;border-radius:8px;font-size:13px;cursor:pointer;transition:all .15s;user-select:none;text-align:center;min-width:36px}
.pronounce-item:hover{background:#dbeafe}
.pronounce-item:active{transform:scale(.94)}
.pronounce-item.py-active{background:#4A90D9;color:#fff;font-weight:600}
.tone-row{display:flex;gap:10px;flex-wrap:wrap}
.tone-row .pronounce-item{font-size:28px;min-width:48px;padding:8px 14px}

/* ===== 专用词汇卡片网格 ===== */
.special-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;padding:0}
.special-card{background:#fff;border-radius:14px;padding:14px 12px 10px;box-shadow:0 2px 8px rgba(0,0,0,.06);cursor:pointer;transition:transform .15s,box-shadow .15s;position:relative;text-align:center}
.special-card:active{transform:scale(.97);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.special-card-zh{font-size:18px;font-weight:700;color:#1a1a2e;margin-bottom:4px}
.special-card-trans{font-size:14px;color:#1890ff;margin-bottom:2px}
.special-card-py{font-size:12px;color:#999}
.special-card-speak{position:absolute;top:8px;right:8px;width:28px;height:28px;border-radius:50%;border:none;background:#e8f5e9;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center}

/* ===== 通用词汇卡片网格 ===== */
.vocab-card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;padding:0}
.vocab-card{background:#fff;border-radius:14px;padding:14px 12px 10px;box-shadow:0 2px 8px rgba(0,0,0,.06);cursor:pointer;transition:transform .15s,box-shadow .15s;position:relative;text-align:center}
.vocab-card:active{transform:scale(.97);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.vocab-card-zh{font-size:18px;font-weight:700;color:#1a1a2e;margin-bottom:4px}
.vocab-card-trans{font-size:14px;color:#1890ff;margin-bottom:2px}
.vocab-card-py{font-size:12px;color:#999}
.vocab-card-speak{position:absolute;top:8px;right:8px;width:28px;height:28px;border-radius:50%;border:none;background:#e8f5e9;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center}
body.dark .vocab-card{background:#2a3a5c;color:#ccc}
body.dark .vocab-card-zh{color:#ddd}
body.dark .vocab-card-py{color:#aaa}

.special-cat-title{font-size:14px;font-weight:700;color:#1a1a2e;margin-bottom:10px}
.special-cat-title .cat-count{font-size:11px;color:#999;font-weight:400}

/* 专用词汇子Tab */
.special-subtabs{display:flex;gap:8px;padding:10px 0 6px;overflow-x:auto;-webkit-overflow-scrolling:touch;flex-shrink:0;position:sticky;top:0;z-index:10;background:#f5f6fa}
.special-subtab{flex:0 0 auto;text-align:center;padding:10px 16px;font-size:13px;font-weight:600;cursor:pointer;border-radius:10px;transition:all .25s;white-space:nowrap;line-height:1.3}
.special-subtab small{font-size:10px;opacity:0.85;display:block;font-weight:400}
/* 安全环保 - 绿色 */
.special-subtab-green{background:#e8f5e9;color:#66BB6A}
.special-subtab-green.active{background:#4CAF50;color:#fff;box-shadow:0 2px 8px rgba(76,175,80,.4)}
/* 质量 - 蓝色 */
.special-subtab-blue{background:#e3f2fd;color:#64B5F6}
.special-subtab-blue.active{background:#2196F3;color:#fff;box-shadow:0 2px 8px rgba(33,150,243,.4)}
/* 设备 - 橙色 */
.special-subtab-orange{background:#fff3e0;color:#FFB74D}
.special-subtab-orange.active{background:#FF9800;color:#fff;box-shadow:0 2px 8px rgba(255,152,0,.4)}
/* 检测 - 紫色 */
.special-subtab-purple{background:#f3e5f5;color:#BA68C8}
.special-subtab-purple.active{background:#9C27B0;color:#fff;box-shadow:0 2px 8px rgba(156,39,176,.4)}
/* 生产 - 红色 */
.special-subtab-red{background:#ffebee;color:#E57373}
.special-subtab-red.active{background:#F44336;color:#fff;box-shadow:0 2px 8px rgba(244,67,54,.4)}
/* 工艺 - 青色 */
.special-subtab-cyan{background:#e0f7fa;color:#4DD0E1}
.special-subtab-cyan.active{background:#00BCD4;color:#fff;box-shadow:0 2px 8px rgba(0,188,212,.4)}
/* 深色模式 */
body.dark .special-subtabs{background:#1a1a2e}
body.dark .special-subtab-green{background:#1b3a1b;color:#81C784}
body.dark .special-subtab-green.active{background:#388E3C;color:#fff}
body.dark .special-subtab-blue{background:#132a4a;color:#64B5F6}
body.dark .special-subtab-blue.active{background:#1976D2;color:#fff}
body.dark .special-subtab-orange{background:#3a2410;color:#FFB74D}
body.dark .special-subtab-orange.active{background:#F57C00;color:#fff}
body.dark .special-subtab-purple{background:#2a1030;color:#BA68C8}
body.dark .special-subtab-purple.active{background:#7B1FA2;color:#fff}
body.dark .special-subtab-red{background:#3a1010;color:#E57373}
body.dark .special-subtab-red.active{background:#D32F2F;color:#fff}
body.dark .special-subtab-cyan{background:#103030;color:#4DD0E1}
body.dark .special-subtab-cyan.active{background:#0097A7;color:#fff}
body.dark .special-subtab small{opacity:0.75}

/* 专用词汇学习面板 */
.btn-special-back{padding:8px 16px;border:none;background:#f0f4ff;color:#4A90D9;font-size:13px;font-weight:600;border-radius:20px;cursor:pointer;margin-bottom:8px;transition:background .2s}
.btn-special-back:hover{background:#dbeafe}
.btn-special-back small{font-size:10px;opacity:0.7;display:block;font-weight:400}
body.dark .btn-special-back{background:#1e2a4a;color:#8ab4f8}
body.dark .btn-special-back:hover{background:#2a3a5c}

/* ===== 闯关板块 ===== */
.challenge-header{background:#fff;border-radius:14px;padding:14px;margin-top:8px;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.challenge-progress-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:12px;color:#999}
.challenge-progress-info span:first-child{font-weight:600;color:#1a1a2e}
.challenge-progress-text{font-size:13px;font-weight:700;color:#4A90D9}
.challenge-progress-bar-wrap{height:6px;background:#eee;border-radius:3px;overflow:hidden}
.challenge-progress-bar-fill{height:100%;background:linear-gradient(90deg,#4A90D9,#2196F3);border-radius:3px;transition:width .3s}
.challenge-header small{font-size:10px;opacity:0.7;font-weight:400}
body.dark .challenge-header{background:#1e2a4a}
body.dark .challenge-progress-info span:first-child{color:#ddd}
body.dark .challenge-progress-bar-wrap{background:#2a3a5c}

.challenge-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:12px}
.ch-level{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:8px;font-size:11px;font-weight:600;cursor:pointer;transition:all .15s;user-select:none;background:#e8e8e8;color:#888;min-width:0;overflow:hidden;padding:2px}
.ch-level:active{transform:scale(.93)}
.ch-locked{background:#e8e8e8;color:#bbb;cursor:default}
.ch-completed{background:#c8e6c9;color:#2e7d32;font-size:10px}
.ch-current{background:#2196F3;color:#fff;box-shadow:0 0 12px rgba(33,150,243,.4);font-size:13px;font-weight:700}
/* 阶段标签 */
.challenge-stage-label{text-align:center;margin-top:6px;padding:4px 12px;font-size:13px;font-weight:600;color:#1565c0;background:rgba(33,150,243,.1);border-radius:6px}
body.dark .challenge-stage-label{color:#64b5f6;background:rgba(33,150,243,.15)}
/* 填空输入 */
.ch-fill-input{width:100%;padding:12px 16px;border:2px solid #e0e0e0;border-radius:8px;font-size:18px;text-align:center;outline:none;box-sizing:border-box;transition:border-color .2s}
.ch-fill-input:focus{border-color:#2196F3}
.ch-fill-btn{width:100%;margin-top:10px}
.ch-fill-result{padding:12px 16px;border-radius:8px;text-align:center;font-size:16px;font-weight:600;margin-top:4px}
.ch-fill-correct{background:#e8f5e9;color:#2e7d32;border:1px solid #a5d6a7}
.ch-fill-wrong{background:#ffebee;color:#c62828;border:1px solid #ef9a9a}
.ch-fill-expect{margin-top:4px;font-size:14px;font-weight:400;opacity:.85}
body.dark .ch-fill-input{background:#1e2a4a;border-color:#3a4a6a;color:#e0e0e0}
body.dark .ch-fill-input:focus{border-color:#1565c0}
body.dark .ch-fill-correct{background:#1b3a1b;color:#81c784}
body.dark .ch-fill-wrong{background:#3a1b1b;color:#ef9a9a}
body.dark .ch-level{background:#2a3a5c;color:#666}
body.dark .ch-locked{background:#1e2a4a;color:#444}
body.dark .ch-completed{background:#1b5e20;color:#81c784}
body.dark .ch-current{background:#1565c0;color:#fff;box-shadow:0 0 12px rgba(21,101,192,.5)}

/* ===== 闯关答题覆盖层 ===== */
.challenge-quiz-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);z-index:2000;display:flex;align-items:center;justify-content:center;padding:20px}
.challenge-quiz-card{background:#fff;border-radius:18px;width:100%;max-width:420px;max-height:90vh;overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.2)}
body.dark .challenge-quiz-card{background:#1e2a4a}
.challenge-quiz-header{display:flex;align-items:center;padding:14px 16px;border-bottom:1px solid #eee;gap:10px}
body.dark .challenge-quiz-header{border-color:#2a3a5c}
.challenge-quiz-back{border:none;background:none;font-size:13px;color:#4A90D9;cursor:pointer;padding:4px 8px;border-radius:6px;text-align:left}
.challenge-quiz-back small{display:block;font-size:10px;opacity:.7}
.challenge-quiz-title{flex:1;text-align:center;font-size:16px;font-weight:700}
.challenge-quiz-progress{font-size:14px;font-weight:600;color:#4A90D9}
.challenge-quiz-body{padding:20px 16px}
.challenge-quiz-question{margin-bottom:16px;text-align:center}
.ch-q-label{font-size:12px;color:#999;margin-bottom:6px}
.ch-q-text{font-size:28px;font-weight:700;color:#1a1a2e}
.ch-q-sub{font-size:16px;font-weight:400;color:#888;margin-top:4px}
body.dark .ch-q-text{color:#eee}
body.dark .ch-q-sub{color:#aaa}
.challenge-quiz-speaker{text-align:center;margin-bottom:14px}
.btn-ch-speak{border:2px solid #4A90D9;background:#e8f4fd;color:#4A90D9;padding:8px 20px;border-radius:20px;font-size:14px;cursor:pointer;font-weight:600;transition:all .15s}
.btn-ch-speak:active{transform:scale(.95)}
.btn-ch-speak small{font-size:10px;opacity:.7}
body.dark .btn-ch-speak{background:#1e3a5e;border-color:#8ab4f8;color:#8ab4f8}
.challenge-quiz-options{display:flex;flex-direction:column;gap:10px}
.ch-option{padding:14px 16px;border:2px solid #e0e0e0;border-radius:12px;font-size:16px;cursor:pointer;transition:all .2s;background:#fff;text-align:left;font-weight:500}
.ch-option:hover{border-color:#4A90D9;background:#f0f7ff}
.ch-option:active{transform:scale(.97)}
.ch-option.ch-correct{background:#e8f5e9;border-color:#4CAF50;color:#2e7d32}
.ch-option.ch-wrong{background:#ffebee;border-color:#f44336;color:#c62828}
body.dark .ch-option{background:#1e2a4a;border-color:#3a4a6c;color:#ddd}
body.dark .ch-option:hover{border-color:#8ab4f8;background:#1e3a5e}
body.dark .ch-option.ch-correct{background:#1b5e20;border-color:#4CAF50;color:#81c784}
body.dark .ch-option.ch-wrong{background:#4a1a1a;border-color:#f44336;color:#ef9a9a}

.challenge-quiz-result{text-align:center;padding:30px 20px}
.ch-result-icon{font-size:56px;margin-bottom:12px}
.ch-result-text{font-size:18px;font-weight:700;margin-bottom:12px}
.ch-result-text small{font-size:12px;font-weight:400;opacity:.7}
.ch-result-stars{font-size:36px;color:#f5a623;letter-spacing:4px}
body.dark .ch-result-stars{color:#fbbf24}

/* ===== 歌曲详情覆盖层 ===== */
.song-detail-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#fff;display:flex;flex-direction:column;z-index:900;overflow:hidden}
.song-detail-header{padding:10px 16px;background:#f8faff;border-bottom:1px solid #e0e6f0;flex-shrink:0;position:relative;z-index:10}
.song-detail-back{padding:6px 14px;background:#4A90D9;color:#fff;border:none;border-radius:20px;font-size:13px;cursor:pointer;position:absolute;left:16px;top:50%;transform:translateY(-50%);z-index:20}
.song-detail-title-row{display:flex;flex-direction:column;align-items:center;gap:2px;padding:0 56px}
.song-detail-title{font-size:18px;font-weight:700;color:#333}
.song-detail-artist{font-size:13px;color:#888}
.song-detail-difficulty{font-size:13px;color:#f59e0b;letter-spacing:2px;margin-top:2px}
.song-detail-body{flex:1;padding:0;overflow-y:auto;-webkit-overflow-scrolling:touch}

/* 音频播放器栏 */
.song-audio-bar{padding:10px 16px;background:#f0f6ff;border-bottom:1px solid #dde5f3;position:sticky;top:0;z-index:5}
.song-audio-bar audio{width:100%;height:32px;outline:none;border-radius:8px;margin-bottom:6px}
.song-speed-row{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.song-speed-row .btn-song-tts{flex-shrink:0}

/* 朗读按钮 */
.btn-song-tts{background:linear-gradient(135deg,#4A90D9,#357ABD);color:#fff;border:none;padding:5px 10px;border-radius:16px;font-size:11px;font-weight:600;cursor:pointer;white-space:nowrap;transition:transform .15s}
.btn-song-tts:hover{transform:scale(1.04)}
.btn-song-tts:active{transform:scale(.97)}
.btn-song-speed{background:#e8f0fe;color:#4A90D9;border:2px solid transparent;padding:4px 7px;border-radius:14px;font-size:11px;font-weight:600;cursor:pointer;white-space:nowrap;transition:all .15s}
.btn-song-speed:hover{background:#d0e4ff}
.btn-song-speed.speed-0_5{border-color:#f59e0b;color:#d97706;background:#fef3c7}
.btn-song-speed.speed-0_75{border-color:#8b5cf6;color:#7c3aed;background:#ede9fe}
.btn-song-speed.speed-1_0{border-color:#10b981;color:#059669;background:#d1fae5}
.btn-song-speed.speed-1_25{border-color:#06b6d4;color:#0891b2;background:#cffafe}
.btn-song-speed.speed-1_5{border-color:#ef4444;color:#dc2626;background:#fee2e2}

/* 歌词区域 */
.song-lyric-container{padding:8px 16px 100px}
.song-lyric-line{padding:8px 12px;margin:4px 0;border-radius:10px;transition:all 0.3s}
.song-lyric-line.lyric-active{background:#e8f0fe;box-shadow:0 2px 8px rgba(74,144,217,.15)}
.song-lyric-line.lyric-active .lyric-zh{color:#2563eb;font-weight:700}
.song-lyric-line.lyric-active .lyric-py{color:#4A90D9}
.lyric-zh{font-size:16px;font-weight:600;color:#333;line-height:1.5}
.lyric-py{font-size:13px;color:#4A90D9;font-style:italic;line-height:1.4;margin-top:2px}
.lyric-id{font-size:13px;color:#999;line-height:1.4;margin-top:1px}

body.dark .song-audio-bar{background:rgba(30,50,80,.8);border-color:#1e2e50}
/* 歌曲列表卡片 */
.song-item{background:#fff;border-radius:14px;padding:14px 16px;margin:8px 0;box-shadow:0 2px 8px rgba(0,0,0,.04);cursor:pointer;transition:all .2s}
.song-item:hover{box-shadow:0 4px 16px rgba(0,0,0,.08)}
.song-title{font-size:15px;font-weight:700;color:#333}
.song-artist{font-size:12px;color:#999;margin-top:2px}
.song-difficulty{font-size:12px;color:#f59e0b;margin-top:3px;letter-spacing:1px}
.song-title-id-line{font-size:13px;color:#888;margin-top:2px}
.song-actions{margin-top:8px}
.btn-song-play{background:#4A90D9;color:#fff;border:none;padding:6px 18px;border-radius:16px;font-size:13px;cursor:pointer}

/* 深色模式 */
body.dark .song-detail-overlay{background:#0f1a2e}
body.dark .song-detail-header{background:rgba(22,35,62,.95);border-color:#1e2e50}
body.dark .song-detail-title{color:#ccc}
body.dark .song-detail-difficulty{color:#fbbf24}
body.dark .btn-song-tts{background:linear-gradient(135deg,#6aafe6,#4A90D9)}
body.dark .btn-song-speed{background:#1e2a4a;color:#8ab4f8}
body.dark .btn-song-speed.speed-0_5{background:#2a2010;color:#fbbf24;border-color:#f59e0b}
body.dark .btn-song-speed.speed-0_75{background:#251a3a;color:#a78bfa;border-color:#8b5cf6}
body.dark .btn-song-speed.speed-1_0{background:#1a2820;color:#6ee7b7;border-color:#10b981}
body.dark .btn-song-speed.speed-1_25{background:#1a2a30;color:#67e8f9;border-color:#06b6d4}
body.dark .btn-song-speed.speed-1_5{background:#2a1818;color:#fca5a5;border-color:#ef4444}
body.dark .song-lyric-title{background:#16233e}
body.dark .lyric-zh{color:#ccc}
body.dark .lyric-id{color:#888}
body.dark .song-lyric-line.lyric-active{background:#1a2a45}
body.dark .song-lyric-line.lyric-active .lyric-zh{color:#8ab4f8}
body.dark .song-lyric-line.lyric-active .lyric-py{color:#6aafe6}
body.dark .song-item{background:#16233e}

/* ===== Bank Selector ===== */
.bank-selector{display:flex;align-items:center;gap:8px;padding:10px 0 6px;flex-wrap:wrap}
.bank-selector select{border:1.5px solid #e5e7eb;border-radius:8px;padding:6px 10px;font-size:13px;background:#fff;color:#222;outline:none;min-width:140px}
.hint-text{font-size:11px;color:#999;line-height:1.4}

/* ===== Word Card ===== */
.word-card{background:#fff;border-radius:16px;padding:24px 20px;margin:10px 0;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.word-main-row{display:flex;align-items:center;justify-content:center;gap:12px}
.word-nav{display:flex;align-items:center;gap:4px}
.btn-prev,.btn-next{width:36px;height:36px;border-radius:50%;border:1px solid #ddd;background:#f5f5f5;font-size:20px;color:#666;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .2s}
.btn-prev:hover,.btn-next:hover{background:#e8e8e8}
.word-center{flex:1;display:flex;justify-content:center}
.word-main{font-size:36px;font-weight:700;color:#1a1a2e;cursor:pointer;user-select:none}
.btn-speak{width:40px;height:40px;border-radius:50%;border:none;background:#fee2e2;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.btn-speak:active{background:#fecaca}
.word-trans{font-size:17px;color:#666;margin-top:6px}
.word-trans.hidden{visibility:hidden}
.word-py{font-size:15px;color:#999;margin-top:4px}
.word-level-tag{display:inline-block;margin-top:8px;font-size:11px;padding:2px 10px;border-radius:10px;background:#e8f4fd;color:#4A90D9}
.word-learn-count{font-size:12px;color:#999;margin-top:4px;min-height:18px}
body.dark .word-learn-count{color:#777}

/* ===== Example ===== */
.example-block{background:#fff;border-radius:16px;padding:16px 20px;margin:10px 0;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.example-title{font-size:12px;color:#4A90D9;margin-bottom:6px;font-weight:600}
.example-id{font-size:14px;color:#1a1a2e;margin-bottom:2px;line-height:1.5}
.example-id .hl{color:#e74c3c;font-weight:700}
.example-py{font-size:12px;color:#6b7394;margin-bottom:4px;line-height:1.4;font-style:italic}
.example-zh{font-size:13px;color:#999;margin-bottom:6px;line-height:1.5}
.btn-example-read{background:none;border:none;color:#4A90D9;font-size:13px;cursor:pointer;padding:0;text-decoration:underline}

/* ===== Progress ===== */
.progress-block{padding:12px 0 4px}
.progress-label{font-size:12px;color:#999;margin-bottom:6px}
.progress-bar-wrap{height:6px;background:#e5e7eb;border-radius:3px;overflow:hidden;margin-bottom:4px}
.progress-bar-fill{height:100%;background:#4A90D9;border-radius:3px;transition:width .3s}
.progress-stat{font-size:12px;color:#999}
.progress-stat .pct{color:#4A90D9;font-weight:600}

/* ===== Play Controls ===== */
.play-controls{display:flex;align-items:center;gap:6px;padding:10px 0;flex-wrap:wrap}
.btn-play{width:36px;height:36px;border-radius:50%;border:none;background:#4A90D9;color:#fff;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.btn-play.playing{background:#e74c3c}
.play-controls select{border:1.5px solid #e5e7eb;border-radius:8px;padding:5px 8px;font-size:11px;background:#fff;color:#666;outline:none}

/* ===== Action Buttons ===== */
.action-btns{display:flex;gap:6px;padding:8px 0 12px}
.btn-action{flex:1;border:none;border-radius:14px;padding:12px 2px;font-size:12px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:3px;transition:all .15s}
.btn-action:active{transform:scale(.96)}
.btn-unknown{background:#dbeafe;color:#1d4ed8}
.btn-mastered{background:#fce7f3;color:#db2777}

/* ===== Stats Panel ===== */
.stats-panel{background:#fff;border-radius:16px;padding:16px;margin:8px 0 16px;box-shadow:0 2px 8px rgba(0,0,0,.04);position:relative}
.stat-item{margin-bottom:10px;position:relative}
.stat-item:last-child{margin-bottom:0}
.stat-val{font-size:22px;font-weight:700;color:#1a1a2e}
.stat-val.stat-unknown{color:#e74c3c}
.stat-label{font-size:12px;color:#999;margin-top:2px}
.btn-practice{position:absolute;right:0;top:50%;transform:translateY(-50%);background:#e8f4fd;color:#4A90D9;border:none;border-radius:16px;padding:8px 16px;font-size:13px;cursor:pointer;font-weight:500}
.btn-practice:active{background:#d0e8fc}

/* ===== Bottom Nav ===== */
.bottom-nav{display:flex;justify-content:space-around;background:#fff;padding:6px 10px env(safe-area-inset-bottom,6px);border-top:1px solid #eee;flex-shrink:0;gap:6px}
.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;cursor:pointer;padding:6px 0;min-width:56px;border-radius:12px;transition:all .2s;flex:1}
.nav-icon{font-size:20px;line-height:1}
.nav-label{font-size:10px;color:#999;text-align:center;line-height:1.3}

/* 激活态：文字变色 */
.nav-learn .nav-label{color:#999}
.nav-learn.active .nav-label{color:#2196F3;font-weight:600}
.nav-challenge .nav-label{color:#999}
.nav-challenge.active .nav-label{color:#FF9800;font-weight:600}
.nav-leaderboard .nav-label{color:#999}
.nav-leaderboard.active .nav-label{color:#4CAF50;font-weight:600}
.nav-profile .nav-label{color:#999}
.nav-profile.active .nav-label{color:#9C27B0;font-weight:600}

/* Dark Mode */
body.dark .nav-learn.active .nav-label{color:#64B5F6}
body.dark .nav-challenge.active .nav-label{color:#FFB74D}
body.dark .nav-leaderboard.active .nav-label{color:#81C784}
body.dark .nav-profile.active .nav-label{color:#BA68C8}

/* ===== Panel Back Button ===== */


/* 我的页面 - 个人信息卡片 */
.pf-info-card{background:#f5f7fa;border-radius:12px;padding:12px;margin-bottom:12px}
body.dark .pf-info-card{background:#1e2130}

.pf-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid #eee}
.pf-row:last-child{border-bottom:none}
body.dark .pf-row{border-bottom-color:#2a2a3a}
.pf-row-label{font-size:13px;color:#666;line-height:1.4}
body.dark .pf-row-label{color:#999}
.pf-row-value{font-size:14px;color:#222;font-weight:500;text-align:right}
body.dark .pf-row-value{color:#ddd}

/* ===== Modal ===== */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:flex-end;justify-content:center}
.modal-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.4)}
.modal-card{position:relative;background:#fff;border-radius:20px 20px 0 0;width:100%;max-width:480px;padding:24px 20px;animation:slideUp .25s ease-out;max-height:70vh;overflow-y:auto}
.modal-header{font-size:16px;font-weight:700;margin-bottom:16px;display:flex;justify-content:space-between}
.modal-close{font-size:18px;color:#999;cursor:pointer;padding:0 4px}
.modal-body{text-align:center;font-size:14px;line-height:1.8}

/* ===== Toast ===== */
.toast{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(.8);background:rgba(0,0,0,.8);color:#fff;padding:12px 24px;border-radius:12px;font-size:14px;z-index:200;pointer-events:none;opacity:0;transition:all .25s;white-space:pre-line;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,-50%) scale(1)}
.toast.toast-err{background:rgba(220,38,38,.9)}

/* ===== Common ===== */
.btn-primary{background:#4A90D9;color:#fff;border:none;border-radius:14px;font-size:15px;padding:12px 0;width:100%;cursor:pointer;font-weight:600;transition:background .15s}
.btn-primary:active{background:#357ABD}
.btn-outline{background:#fff;color:#4A90D9;border:2px solid #4A90D9;border-radius:14px;font-size:14px;padding:10px 0;cursor:pointer;font-weight:600;width:100%;transition:all .15s}
.btn-outline:active{background:#eef4fc}


/* ===== 积分榜 ===== */
.lb-rank-item{display:flex;align-items:center;padding:10px 0;border-bottom:1px solid #f0f0f0;gap:10px}
.lb-rank-num{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff;flex-shrink:0}
.lb-rank-1{background:#f5a623}
.lb-rank-2{background:#9b9b9b}
.lb-rank-3{background:#cd7f32}
.lb-rank-oth{background:#d0d5dd;color:#666}
.lb-name{flex:1;font-weight:600;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb-score{font-size:14px;font-weight:700;color:#4A90D9;flex-shrink:0}
.lb-dept-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:10px 16px;font-weight:700;font-size:14px;display:flex;justify-content:space-between}
.lb-dept-header span:last-child{font-size:12px;opacity:.8;font-weight:400}

@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}

/* ===== 登录页 ===== */
#login-container{flex:1;min-height:0;display:flex;flex-direction:column;overflow-y:auto;background:#f5f6fa;padding:20px 0}
.login-card{margin:auto}
body.dark #login-container{background:#1a1a2e}
.login-card{width:340px;max-width:90vw;background:#fff;border-radius:18px;padding:32px 28px;box-shadow:0 8px 32px rgba(0,0,0,.1)}
body.dark .login-card{background:#1e2a4a;box-shadow:0 8px 32px rgba(0,0,0,.3)}
.login-logo{width:52px;height:52px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:10px;overflow:hidden}
.login-title{font-size:20px;font-weight:700;color:#222}
.login-sub{font-size:12px;color:#999;margin-top:2px}
body.dark .login-title{color:#ddd}
.btn-primary{width:100%;padding:13px;border:none;border-radius:12px;background:#4A90D9;color:#fff;font-size:16px;font-weight:600;cursor:pointer;transition:background .2s}
.btn-primary:hover{background:#3a7bc8}
.btn-primary:active{transform:scale(.98)}
.btn-outline{padding:10px 16px;border:1px solid #4A90D9;border-radius:10px;background:transparent;color:#4A90D9;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}
.btn-outline:hover{background:#4A90D9;color:#fff}
.hint-text{color:#999;font-size:13px;text-align:center;padding:12px 0}
.ck-back-btn{padding:4px 10px;border:1px solid #ccc;border-radius:14px;background:transparent;color:#666;font-size:13px;cursor:pointer}
.ck-back-btn:active{background:#eee}
body.dark .ck-back-btn{color:#aaa;border-color:#555}
body.dark .ck-back-btn:active{background:#333}
.ck-period-btn{padding:5px 12px;border:1px solid #4A90D9;border-radius:16px;background:transparent;color:#4A90D9;font-size:13px;cursor:pointer;transition:all .15s}
.ck-period-btn:active{transform:scale(.95)}
.ck-period-btn.ck-active{background:#4A90D9;color:#fff}
body.dark .ck-period-btn{color:#8ab4f8;border-color:#8ab4f8}
body.dark .ck-period-btn.ck-active{background:#8ab4f8;color:#1a1a2e}

/* 我的页面 - 学习打卡 */
.checkin-section{background:linear-gradient(180deg,#fff,#f7faff);border-radius:16px;padding:16px;margin-bottom:12px;box-shadow:0 2px 10px rgba(74,144,217,.08);border:1px solid #eef4fc}
body.dark .checkin-section{background:linear-gradient(180deg,#1e2a4a,#17223a);border-color:#1e2e50}
.checkin-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.checkin-header-left{display:flex;align-items:center;gap:10px}
.checkin-header-icon{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#4A90D9,#357ABD);display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
body.dark .checkin-header-icon{background:linear-gradient(135deg,#6aafe6,#4A90D9)}
.checkin-header-title{font-size:14px;font-weight:700;color:#333;line-height:1.3}
body.dark .checkin-header-title{color:#ccc}
.checkin-header-title small{font-weight:400;font-size:11px;color:#999}
.checkin-summary{display:flex;gap:10px;margin-bottom:14px}
.checkin-stat{flex:1;display:flex;align-items:center;gap:10px;background:#f4f8ff;border-radius:14px;padding:12px;border:1px solid #e3edfb}
body.dark .checkin-stat{background:#1c2a48;border-color:#2a3a5e}
.checkin-stat-icon{font-size:22px;flex-shrink:0}
.checkin-stat-body{display:flex;flex-direction:column;min-width:0}
.checkin-stat-num{font-size:26px;font-weight:800;color:#4A90D9;line-height:1.1}
body.dark .checkin-stat-num{color:#8ab4f8}
.checkin-stat-label{font-size:11px;color:#888;line-height:1.35;margin-top:2px}
body.dark .checkin-stat-label{color:#9aa}
.checkin-today-flag{display:inline-flex;align-items:center;background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;font-size:11px;font-weight:700;padding:6px 12px;border-radius:20px;box-shadow:0 2px 6px rgba(34,197,94,.3);white-space:nowrap;line-height:1.25}
body.dark .checkin-today-flag{background:linear-gradient(135deg,#34d399,#22c55e);color:#052e16}
.checkin-week{display:flex;justify-content:space-between;gap:6px;margin-bottom:14px}
.checkin-day{flex:1;display:flex;flex-direction:column;align-items:center;gap:5px}
.checkin-day-dot{width:30px;height:30px;border-radius:50%;background:#eef2f8;border:2px solid #e0e6f0;display:flex;align-items:center;justify-content:center;font-size:13px;color:#fff;font-weight:700;transition:all .2s}
.checkin-day.done .checkin-day-dot{background:linear-gradient(135deg,#4A90D9,#357ABD);border-color:#4A90D9}
.checkin-day.today .checkin-day-dot{border-color:#f59e0b;box-shadow:0 0 0 3px rgba(245,158,11,.15)}
.checkin-day-label{font-size:10px;color:#999}
.checkin-day.today .checkin-day-label{color:#f59e0b;font-weight:700}
body.dark .checkin-day-dot{background:#1a2540;border-color:#2a3a5e}
body.dark .checkin-day.done .checkin-day-dot{background:linear-gradient(135deg,#6aafe6,#4A90D9);border-color:#6aafe6}
body.dark .checkin-day-label{color:#7a88a0}
.btn-checkin-toggle{width:100%;padding:9px;border:1px dashed #b8cdf0;border-radius:12px;background:#f7faff;color:#4A90D9;font-size:13px;font-weight:600;cursor:pointer;transition:all .15s}
.btn-checkin-toggle:active{background:#e8f0fe}
body.dark .btn-checkin-toggle{background:#1c2a48;border-color:#2a3a5e;color:#8ab4f8}
body.dark .btn-checkin-toggle:active{background:#22304f}
.checkin-detail{border-top:1px solid #eef1f6;margin-top:12px;padding-top:12px}
body.dark .checkin-detail{border-top-color:#26324e}
.checkin-detail-streak{text-align:center;font-size:14px;color:#666;margin-bottom:8px}
.checkin-detail-streak strong{font-size:24px;color:#4A90D9;margin:0 4px}
body.dark .checkin-detail-streak{color:#aaa}
body.dark .checkin-detail-streak strong{color:#8ab4f8}
.ck-period-row{display:flex;justify-content:center;gap:6px;margin:10px 0;flex-wrap:wrap}
.checkin-chart-wrap{position:relative;height:200px}
.admin-item{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:#f8f9fa;border-radius:10px;margin-bottom:6px;font-size:14px}
body.dark .admin-item{background:#16213e}
.admin-item .user{font-weight:600}
.admin-item .actions{display:flex;gap:6px}
.admin-item .btn-sm{padding:5px 12px;border:1px solid;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;background:transparent;transition:all .2s}
.admin-item .btn-approve{border-color:#27ae60;color:#27ae60}
.admin-item .btn-approve:hover{background:#27ae60;color:#fff}
.admin-item .btn-reject{border-color:#e74c3c;color:#e74c3c}
.admin-item .btn-reject:hover{background:#e74c3c;color:#fff}
.top-bar .btn-logout{border:1px solid #e74c3c;color:#e74c3c;background:transparent;padding:4px 10px;border-radius:6px;font-size:12px;cursor:pointer}
#reg-dept{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%23999' stroke-width='1.5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:32px}
body.dark #reg-dept{background:#16213e;color:#ddd;border-color:#444}

/* ===== 学习统计栏 ===== */
.vocab-stats{background:#f0f2f5;border-radius:14px;padding:12px;margin-top:12px}
body.dark .vocab-stats{background:#1e2a4a}
.vs-cards{display:flex;gap:8px;margin-bottom:10px}
.vs-card{flex:1;background:#fff;border-radius:10px;padding:10px 6px;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,.06)}
body.dark .vs-card{background:#2a3a5c;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.vs-num{font-size:26px;font-weight:700;color:#333;line-height:1.1}
body.dark .vs-num{color:#e0e0e0}
.vs-label{font-size:11px;color:#888;line-height:1.35;margin-top:2px}
body.dark .vs-label{color:#999}
.vs-card-mastered .vs-num{color:#27ae60}
body.dark .vs-card-mastered .vs-num{color:#2ecc71}
.vs-card-unknown .vs-num{color:#e74c3c}
body.dark .vs-card-unknown .vs-num{color:#e74c3c}
.btn-filter-center{display:block;margin:0 auto;padding:7px 24px;border:none;border-radius:8px;background:#4A90D9;color:#fff;font-size:13px;font-weight:600;cursor:pointer;line-height:1.35;transition:all .2s}
.btn-filter-center:hover{background:#3a7bc8}
body.dark .btn-filter-center{background:#3b6cb4}
body.dark .btn-filter-center:hover{background:#2d5aa0}

/* ===== 部门月度统计表 ===== */
.dept-stats-table{width:100%;border-collapse:collapse;font-size:12px;margin:4px 0}
.dept-stats-table thead th{padding:6px 4px;text-align:center;font-weight:600;line-height:1.35;border-bottom:2px solid #e0e0e0;vertical-align:bottom}
.dept-stats-table thead th small{font-weight:400;font-size:10px;color:#999}
.dept-stats-table tbody td{padding:6px 4px;text-align:center;border-bottom:1px solid #f0f0f0;line-height:1.4}
.dept-stats-table tbody td:first-child{text-align:left;font-weight:500;padding-left:8px}
.dept-month-dept{text-align:left !important;padding-left:8px !important}
.dept-month-cnt{width:36px}
.dept-month-current{background:#e3f0ff;color:#1a6dd4;border-radius:6px 6px 0 0}
#dept-month-select option{background:#fff;color:#222}

body.dark .dept-stats-table thead th{border-bottom-color:#2a2a3a}
body.dark .dept-stats-table tbody td{border-bottom-color:#1e2030;color:#ddd}
body.dark .dept-month-current{background:#1a3a5c;color:#6db3f2}
body.dark #dept-month-select{background:#1e2130;color:#ddd;border-color:#3a3a4a}
body.dark #dept-month-select option{background:#1e2130;color:#ddd}

/* ===== 登录/注册/审核表单 ===== */
.auth-tabs{display:flex;gap:8px;margin-bottom:16px}
.auth-tab{flex:1;text-align:center;padding:10px 6px;font-size:14px;font-weight:600;color:#888;cursor:pointer;border-radius:10px;transition:all .2s;line-height:1.3}
.auth-tab small{display:block;font-size:10px;font-weight:400;opacity:.7}
.auth-tab.active{background:#e8f4fd;color:#4A90D9;font-weight:700}
body.dark .auth-tab{color:#888}
body.dark .auth-tab.active{background:#1e3a5e;color:#8ab4f8}
.auth-field{margin-bottom:14px}
.auth-label{font-size:13px;font-weight:600;color:#333;margin-bottom:6px;line-height:1.3}
.auth-label small{font-size:10px;font-weight:400;color:#999;opacity:.8;margin-left:4px}
body.dark .auth-label{color:#ccc}
body.dark .auth-label small{color:#9aa}
.auth-field input,.auth-field select{width:100%;padding:11px 12px;border:1px solid #ddd;border-radius:10px;font-size:14px;color:#222;background:#fff}
.auth-field input:focus,.auth-field select:focus{outline:none;border-color:#4A90D9}
body.dark .auth-field input,body.dark .auth-field select{background:#2a3a5c;color:#ccc;border-color:#3a4a6c}
.auth-tip{color:#999;font-size:12px;text-align:center;margin-top:14px;line-height:1.5}
.auth-tip small{display:block;font-size:10px;opacity:.8}
body.dark .auth-tip{color:#9aa}
.auth-admin-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;gap:8px}
.auth-admin-title{font-size:16px;font-weight:700;color:#333;line-height:1.3}
.auth-admin-title small{display:block;font-size:11px;font-weight:400;color:#999}
body.dark .auth-admin-title{color:#ccc}
.auth-admin-logout{padding:6px 12px;font-size:12px;white-space:nowrap}
.auth-admin-logout small{font-size:9px;display:block;font-weight:400;opacity:.8}
.admin-item .btn-sm small{display:block;font-size:9px;font-weight:400;opacity:.8}
.admin-section-title{font-size:13px;font-weight:700;color:#8e6f1f;text-align:center;margin:14px 0 8px;padding-top:12px;border-top:1px dashed #e0d5b8;line-height:1.4}
.admin-section-title small{display:block;font-size:10px;font-weight:400;color:#b8a56a}
body.dark .admin-section-title{color:#d4b978;border-top-color:#3a3f5c}
body.dark .admin-section-title small{color:#8a7f5e}