:root{--bg: #f5f3ee;--surface: #ffffff;--primary: #5b8dee;--primary-dark: #3b6fd4;--accent: #f5a623;--success: #52c97a;--danger: #ff6b6b;--gold: #f5c842;--text: #1a1a2e;--text-soft: #6b7280;--border: #e5e7eb;--shadow: 0 6px 32px rgba(0,0,0,.1);--radius: 18px;--radius-sm: 12px;--font: "Segoe UI", "PingFang SC", system-ui, sans-serif;--fs: 18px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:var(--fs)}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;font-size:1rem}.app{max-width:760px;margin:0 auto;padding:28px 20px 64px}.btn{border:none;border-radius:var(--radius-sm);padding:13px 28px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .18s;font-family:inherit}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 16px #5b8dee66}.btn-secondary{background:var(--surface);color:var(--text);border:2px solid var(--border)}.btn-secondary:hover{border-color:var(--primary);color:var(--primary)}.btn-gold{background:var(--gold);color:#7a4f00}.btn-sm{padding:7px 16px;font-size:.9rem;background:var(--primary);color:#fff;border:none;border-radius:8px;cursor:pointer}.btn-ghost{background:none;border:none;cursor:pointer;color:var(--text-soft)}.icon-btn{background:none;border:none;cursor:pointer;font-size:1.3rem;padding:6px;border-radius:8px}.btn-lg{display:flex;align-items:center;justify-content:center;gap:10px;background:var(--card-bg);border:2px solid var(--card-color);border-radius:16px;padding:18px 24px;font-size:1.05rem;font-weight:700;color:var(--card-color);cursor:pointer;transition:all .18s;box-shadow:none;width:100%}.btn-lg:hover{background:var(--card-bg)!important;opacity:.85;transform:translateY(-2px)}.icon-btn:hover{background:var(--border)}.app-header{text-align:center;padding:40px 0 28px}.app-header h1{font-size:1.6rem;font-weight:800;letter-spacing:-.5px;line-height:1.2}.app-subtitle{font-size:.9rem;color:var(--text-soft);margin-top:4px}.stats-bar{display:flex;justify-content:center;gap:12px;color:var(--text-soft);font-size:1.05rem;margin-top:14px}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:36px}.mode-card{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:28px 20px;text-align:center;cursor:pointer;transition:all .22s;display:flex;flex-direction:column;align-items:center;gap:10px}.mode-card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:var(--shadow)}.mode-card.primary{background:linear-gradient(145deg,#5b8dee,#7aa3f5);color:#fff;border-color:transparent}.mode-card.primary:hover{box-shadow:0 10px 36px #5b8dee73}.mode-icon{font-size:3rem}.mode-title{font-size:1.4rem;font-weight:800}.mode-desc{font-size:1rem;opacity:.85;line-height:1.5}.level-tabs{display:flex;gap:10px;justify-content:center;margin-bottom:32px;padding:6px;background:var(--surface);border-radius:var(--radius);border:2px solid var(--border);box-shadow:0 2px 12px #0000000f}.level-tab{flex:1;padding:12px 20px;border:none;border-radius:12px;background:transparent;font-size:1.1rem;font-weight:700;color:var(--text-soft);cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:6px;position:relative}.level-tab.active{background:var(--primary);color:#fff;box-shadow:0 4px 16px #5b8dee66}.level-tab:not(.level-tab-locked):hover{background:#5b8dee1f}.level-tab-locked{opacity:.55;cursor:default}.level-lock{font-size:.85rem}.level-soon{font-size:.65rem;font-weight:700;background:var(--accent);color:#fff;border-radius:4px;padding:1px 5px;margin-left:2px}.section-title{font-size:1rem;font-weight:700;color:var(--text-soft);text-transform:uppercase;letter-spacing:1px;margin-bottom:14px}.unit-list{display:flex;flex-direction:column;gap:10px}.unit-row{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius-sm);padding:18px 20px;display:flex;align-items:center;justify-content:space-between;transition:all .18s}.unit-row:hover{border-color:var(--primary);box-shadow:0 2px 12px #5b8dee26}.unit-row.completed{border-color:var(--success);background:#f0fdf4}.unit-info{display:flex;align-items:center;gap:12px}.unit-key{background:var(--primary);color:#fff;font-size:.78rem;font-weight:800;padding:3px 10px;border-radius:6px}.unit-title{font-size:1.05rem;font-weight:600}.unit-right{display:flex;align-items:center;gap:10px}.unit-count{font-size:.95rem;color:var(--text-soft)}.badge-complete{background:var(--success);color:#fff;font-size:.78rem;font-weight:700;padding:3px 10px;border-radius:6px}.browse-header{display:flex;align-items:center;gap:14px;margin-bottom:18px}.browse-header h2{font-size:1.8rem;font-weight:800}.course-tabs{display:flex;gap:8px;margin-bottom:14px}.course-tab{flex:1;border:2px solid var(--border);background:var(--surface);border-radius:8px;padding:10px 16px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .15s}.course-tab:hover{border-color:var(--primary)}.course-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.browse-stats{text-align:center;color:var(--text-muted);margin-bottom:12px;font-size:.9rem}.unit-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.tab-btn{border:2px solid var(--border);background:var(--surface);border-radius:20px;padding:6px 16px;font-size:.95rem;cursor:pointer;transition:all .15s}.tab-btn:hover{border-color:var(--primary)}.tab-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.browse-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:12px}.word-chip{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius-sm);padding:12px 8px;text-align:center;cursor:pointer;transition:all .18s;display:flex;flex-direction:column;align-items:center;gap:6px}.word-chip:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow)}.word-chip-img{width:68px;height:68px;object-fit:contain}.word-chip-img[style*="opacity: 0.2"]{filter:grayscale(1)}.word-chip-name{font-size:.9rem;font-weight:700;word-break:break-all;line-height:1.3}.flashcard-scene{display:flex;flex-direction:column;align-items:center;gap:12px}.flashcard-meta{width:100%;display:flex;justify-content:space-between;font-size:1.05rem}.flashcard-unit{font-weight:700;color:var(--primary)}.flashcard-counter{color:var(--text-soft)}.flashcard{width:100%;max-width:480px}.flashcard-face{border-radius:18px;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:var(--shadow)}.flashcard-front{background:linear-gradient(160deg,#eef3ff,#fff)}.flashcard-img{max-width:100px;max-height:100px;width:auto;height:auto;object-fit:contain;margin-bottom:8px}.flashcard-word-row{display:flex;align-items:center;gap:10px}.flashcard-word{font-size:1.8rem;font-weight:900;letter-spacing:-.5px}.flashcard-hint{font-size:.9rem;color:var(--text-soft);margin-top:8px}.flashcard-simple{display:flex;flex-direction:column;align-items:center;padding:20px;background:#fff;border-radius:16px;box-shadow:0 4px 20px #00000014}.flashcard-simple .flashcard-img{max-width:480px;max-height:480px}.flashcard-simple .flashcard-word{font-size:2rem;font-weight:800;text-align:center;margin-top:12px}.flashcard-simple .flashcard-phonetic{font-size:1.2rem;color:var(--primary);font-style:italic;text-align:center;margin-top:4px}.flashcard-definition{font-size:1.3rem;line-height:1.7;text-align:center;margin:12px 0}.flashcard-phonetic{font-size:1.1rem;color:var(--primary);font-style:italic;margin-bottom:10px}.flashcard-controls{display:flex;gap:12px;justify-content:center}.spelling-scene{display:flex;flex-direction:column;align-items:center;gap:12px}.spelling-header{width:100%;display:flex;align-items:center;gap:12px}.spelling-title{font-size:1.1rem;font-weight:700;flex:1}.spelling-score{font-size:1.2rem;font-weight:800;color:var(--accent)}.spelling-progress-bar{width:100%;height:6px;background:var(--border);border-radius:3px;overflow:hidden}.spelling-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),#7aa3f5);border-radius:3px;transition:width .5s ease}.phase-tag{text-align:center;font-size:1.3rem;font-weight:900;color:var(--primary)}.phase-correct{color:var(--success)}.phase-wrong{color:var(--danger);animation:shake .4s}.spell-card{width:100%;max-width:520px;background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;padding:28px 24px 24px;gap:14px}.spell-card-img{max-width:240px;max-height:240px;width:auto;height:auto;object-fit:contain;margin-bottom:8px}.spell-def{font-size:1.1rem;line-height:1.5;text-align:center;max-width:460px;margin-top:4px}.spell-phonetic{font-size:1.15rem;color:var(--primary);font-style:italic}.spell-audio-btn{background:#eef3ff;color:var(--primary);border:2px solid #d0dcff;font-size:1.1rem;padding:10px 26px}.spell-audio-btn:hover{background:#dce8ff}.spell-hint{font-size:1.1rem;color:var(--accent);font-weight:700;text-align:center}.spell-actions{display:flex;gap:12px}.btn-hint{background:#fff8ee;color:#b07d00;border:2px solid #f5d67a}.btn-hint:hover{background:#fff3d6}.btn-hint:disabled{opacity:.4;cursor:not-allowed}.btn-giveup{background:#f9fafb;color:var(--text-soft);border:2px solid var(--border)}.btn-giveup:hover{border-color:var(--danger);color:var(--danger)}.syllable-group-row{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}.syllable-group{display:flex;flex-direction:column;align-items:center;gap:4px}.syllable-ipa{font-size:.9rem;color:#7a9cc6;font-style:italic;min-height:1.2em;letter-spacing:.5px}.syllable-boxes{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}.letter-box{width:58px;height:68px;border-radius:12px;border:3px solid var(--border);text-align:center;font-size:2rem;font-weight:900;font-family:Courier New,monospace;background:var(--surface);transition:border-color .15s,background .15s,color .15s;outline:none}.letter-box:focus{border-color:var(--primary);background:#eef3ff}.letter-correct{border-color:var(--success)!important;background:#d1fae5!important;color:#15803d!important}.letter-wrong{border-color:var(--danger)!important;background:#fee2e2!important;color:#b91c1c!important;animation:shake .35s}.result-screen{display:flex;justify-content:center;align-items:center;min-height:60vh}.result-card{background:var(--surface);border-radius:var(--radius);padding:48px 36px;text-align:center;box-shadow:var(--shadow);max-width:400px;width:100%}.result-title{font-size:2rem;font-weight:900;margin-bottom:20px}.result-score{font-size:4rem;font-weight:900;color:var(--primary);line-height:1}.result-bar{height:12px;background:var(--border);border-radius:6px;overflow:hidden;margin:20px 0 10px}.result-bar-fill{height:100%;background:linear-gradient(90deg,var(--success),#22d3a0);border-radius:6px;transition:width 1s ease}.result-pct{font-size:1.1rem;color:var(--text-soft);margin-bottom:28px}@keyframes shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-7px)}40%,80%{transform:translate(7px)}}.home-view{max-width:860px;margin:0 auto}.home-nav-tabs{display:flex;gap:8px;margin-bottom:28px;padding:5px;background:var(--surface);border-radius:var(--radius);border:2px solid var(--border);box-shadow:0 2px 12px #0000000f}.home-nav-tab{flex:1;padding:11px 18px;border:none;border-radius:12px;background:transparent;font-size:.95rem;font-weight:700;color:var(--text-soft);cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:6px}.home-nav-tab.active{background:var(--primary);color:#fff;box-shadow:0 4px 16px #5b8dee66}.home-nav-tab:not(.active):hover{background:#5b8dee1f;color:var(--primary)}.home-contact-info{text-align:center;font-size:.85rem;color:var(--text-soft);margin-top:40px;padding:8px;background:#5b8dee14;border-radius:8px}.home-banner{width:50%;height:auto;display:block;margin-top:24px;border-radius:12px;margin-left:auto;margin-right:auto}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}.course-card{background:var(--surface);border-radius:20px;border:2px solid var(--border);padding:24px 20px;cursor:pointer;transition:transform .18s,box-shadow .18s;display:flex;flex-direction:column;gap:10px}.course-card:hover:not(.locked){transform:translateY(-4px);box-shadow:0 8px 24px #0000001a;border-color:var(--card-color)}.course-card.locked{opacity:.7;cursor:default}.course-card-header{display:flex;align-items:center;gap:10px}.course-icon{font-size:2.4rem}.course-id{font-size:.7rem;font-weight:800;letter-spacing:1px;padding:3px 10px;border-radius:20px;background:var(--card-bg);color:var(--card-color)}.course-lock{margin-left:auto;font-size:1.2rem}.course-title{font-size:1.5rem;font-weight:800;color:var(--text);line-height:1.2}.course-subtitle{font-size:.9rem;color:var(--text-soft)}.course-units-preview{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}.unit-chip{font-size:.72rem;font-weight:700;padding:3px 9px;border-radius:6px;background:var(--card-bg);color:var(--card-color)}.unit-chip.muted{background:var(--surface);color:var(--text-soft);border:1px solid var(--border)}.course-btn{margin-top:8px;padding:10px 18px;border-radius:10px;background:var(--card-color);color:#fff;font-size:.9rem;font-weight:700;text-align:center;display:block}.course-btn.locked{background:var(--text-soft);cursor:default}.level-view{max-width:860px;margin:0 auto;padding:24px 28px}.back-btn{background:none;border:none;color:var(--primary);font-size:.95rem;font-weight:600;cursor:pointer;padding:0;margin-bottom:20px;display:flex;align-items:center;gap:4px}.back-btn:hover{text-decoration:underline}.level-banner{display:flex;align-items:center;gap:20px;background:var(--card-bg);border-radius:16px;padding:20px 22px;border:2px solid var(--card-color);margin-bottom:20px}.random-btn-wrap{margin-bottom:20px}.level-icon{font-size:3.5rem}.level-title{font-size:1.8rem;font-weight:800;color:var(--card-color)}.level-subtitle{font-size:.9rem;color:var(--text-soft);margin-top:4px}.unit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}.unit-card{background:var(--surface);border-radius:16px;border:2px solid var(--border);padding:20px 18px;display:flex;flex-direction:column;gap:8px;min-width:0;min-height:0;overflow:hidden;transition:transform .18s,box-shadow .18s}.unit-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px #00000014}.unit-card.done{border-color:var(--success)}.unit-key-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px;min-width:0;flex-shrink:0}.unit-card-key{font-size:.68rem;font-weight:800;letter-spacing:1px;padding:2px 7px;border-radius:6px;font-size:.65rem;background:var(--card-color);color:#fff}.unit-card.done .unit-card-key{background:var(--success)}.unit-title-row{padding:5px 6px;border-radius:8px;background:linear-gradient(135deg,#f8fafc,#f1f5f9);min-width:0}.unit-stars{font-size:1rem;color:#f59e0b;flex-shrink:0}.unit-card-title{font-size:1rem;font-weight:700;color:var(--text);line-height:1.3;margin:0}.unit-card-subtitle-zh{font-size:.75rem;color:var(--text-soft);font-weight:400;margin:0;line-height:1.3}.unit-card-meta{font-size:.78rem;color:var(--text-soft);margin:3px 0 4px 6px}.unit-card-actions{display:flex;gap:8px;margin-top:6px}.unit-card-actions .btn{flex:1}.unit-action-btn{display:flex;flex-direction:column;align-items:center;gap:4px;flex:1;padding:10px 8px 8px;border-radius:14px;cursor:pointer;border:1.5px solid;font-size:.78rem;font-weight:700;transition:all .18s;line-height:1.2;min-width:0}.unit-action-btn:hover{transform:translateY(-2px);box-shadow:0 4px 14px #0000001f}.unit-action-btn:active{transform:translateY(0)}.unit-action-icon{font-size:1.5rem;line-height:1}.unit-action-label{font-size:.75rem;font-weight:700}.unit-action-btn.challenge{background:linear-gradient(135deg,#dbeafe,#eff6ff);border-color:#93c5fd;color:#1d4ed8}.unit-action-btn.challenge:hover{background:linear-gradient(135deg,#bfdbfe,#dbeafe);border-color:#60a5fa;box-shadow:0 4px 16px #3b82f633}.unit-action-btn.learn{background:linear-gradient(135deg,#ede9fe,#f5f3ff);border-color:#c4b5fd;color:#6d28d9}.unit-action-btn.learn:hover{background:linear-gradient(135deg,#ddd6fe,#ede9fe);border-color:#a78bfa;box-shadow:0 4px 16px #8b5cf633}.embedded-view{margin-top:24px;background:var(--surface);border-radius:20px;border:1px solid #e5e7eb;box-shadow:0 2px 16px #0000000f;padding:24px;position:relative}.embedded-header{margin-bottom:16px;border-bottom:1px solid #e5e7eb;padding-bottom:12px}.browse-all-view{max-width:860px;margin:0 auto}.flashcard-standalone .flashcard-container{max-width:500px;margin:0 auto}@media (max-width: 520px){.app{padding:18px 14px 48px}.app-header h1{font-size:2rem}.mode-grid{grid-template-columns:1fr}.app-header-row{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:28px}.stats-card-btn{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#bfdbfe,#dbeafe);border:1.5px solid #93c5fd;border-radius:20px;padding:12px 18px;cursor:pointer;transition:all .18s;flex-shrink:0;min-width:190px}.stats-card-btn:hover{background:linear-gradient(135deg,#93c5fd,#bfdbfe);border-color:#60a5fa;transform:translateY(-2px);box-shadow:0 6px 20px #3b82f633}.stats-card-btn .stats-card-label{color:#1d4ed8;font-size:1rem;font-weight:700;line-height:1}.stats-card-btn .stats-card-arrow{color:#60a5fa;margin-left:auto;flex-shrink:0;transition:transform .18s,color .18s}.stats-card-btn:hover .stats-card-arrow{transform:translate(4px);color:#2563eb}.stats-card-btn .stats-card-icon{color:#3b82f6}.stats-card-icon{width:28px;height:28px;flex-shrink:0;color:var(--primary)}.stats-card-label{font-size:1rem;font-weight:800;color:var(--text);line-height:1}.stats-card-arrow{font-size:1.2rem;color:var(--text-soft);margin-left:auto;flex-shrink:0;transition:transform .18s,color .18s}.stats-card-btn:hover .stats-card-arrow{transform:translate(4px);color:var(--primary)}.stats-page{max-width:500px;margin:0 auto;padding:16px 16px 48px;min-height:100vh}.stats-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}.stats-title{font-size:1.5rem;font-weight:800;color:var(--text)}.stats-empty{text-align:center;padding:60px 20px;color:var(--text-soft)}.stats-empty-icon{font-size:3.5rem;margin-bottom:16px}.stats-empty h2{font-size:1.2rem;margin-bottom:8px;color:var(--text)}.stats-empty p{margin-bottom:20px}.stats-overview-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:20px}.stats-overview-grid .stat-card{background:#f0f9ff;border-radius:16px;padding:16px;display:flex;align-items:center;gap:12px;box-shadow:0 2px 8px #0000000f}.stats-overview-grid .stat-card.highlight{grid-column:span 2;justify-content:center;gap:20px;padding:20px;background:linear-gradient(135deg,#eff6ff,#dbeafe)}.stat-big-num{font-size:2rem;font-weight:800;color:var(--primary);line-height:1}.stat-max{font-size:.9rem;color:var(--text-soft);font-weight:400}.stat-info{display:flex;flex-direction:column}.stat-value{font-size:2rem;font-weight:800;color:var(--primary);line-height:1}.stat-info .stat-label{font-size:.8rem;color:var(--text-soft)}.donut-wrap{display:flex;flex-direction:column;align-items:center;gap:2px}.donut-label{font-size:.7rem;color:var(--text-soft)}.stats-section{background:#fff;border-radius:16px;padding:18px;margin-bottom:16px;box-shadow:0 2px 10px #0000000d}.stats-section-title{font-size:.9rem;font-weight:700;color:var(--text);margin-bottom:14px}.stats-section.section-trend{background:linear-gradient(180deg,#f8fafc,#fff);border:1px solid #e2e8f0}.stats-section.section-units{background:#fafdf7;border:1px solid #dcfce7}.stats-section.section-hard{background:#fff1f2;border:1px solid #ffe4e6}.bar-chart{display:block;overflow:visible;width:100%;max-width:440px;height:180px;margin:0 auto}.chart-empty{text-align:center;padding:30px;color:var(--text-soft);font-size:.9rem}.chart-legend{display:flex;gap:16px;margin-bottom:8px;justify-content:center}.legend-item{font-size:.75rem;color:var(--text-soft);display:flex;align-items:center;gap:4px}.legend-dot{width:10px;height:10px;border-radius:3px}.legend-dot.blue{background:#3b82f6}.legend-dot.green{background:#22c55e}.unit-cards-list{display:flex;flex-direction:column;gap:10px}.unit-card-expandable{background:#f8fafc;border-radius:12px;border:1px solid #e2e8f0;overflow:hidden;transition:all .2s}.unit-card-expandable:hover{border-color:#cbd5e1}.unit-card-expandable.expanded{background:#fff;border-color:var(--primary);box-shadow:0 2px 12px #3b82f61a}.unit-card-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;cursor:pointer}.unit-card-left{display:flex;align-items:center;gap:10px}.unit-key-badge{background:var(--primary);color:#fff;font-size:.7rem;font-weight:800;padding:3px 8px;border-radius:6px}.unit-title-text{font-size:.95rem;font-weight:600;color:var(--text)}.unit-card-right{display:flex;align-items:center;gap:10px}.unit-stars{font-size:.9rem}.unit-stars .star-lit{color:#f59e0b}.unit-score{font-size:.75rem;color:var(--text-soft);min-width:40px;text-align:right}.expand-icon{font-size:.7rem;color:var(--text-soft)}.unit-progress-mini{height:6px;background:#e2e8f0;border-radius:3px;display:flex;margin:0 16px;overflow:hidden}.prog-bar-segment{height:100%}.prog-bar-segment.mastered{background:#22c55e}.prog-bar-segment.learning{background:#3b82f6}.prog-bar-segment.need{background:#ef4444}.unit-progress-labels{display:flex;justify-content:space-between;padding:8px 16px 12px;font-size:.7rem}.unit-progress-labels .label{display:flex;align-items:center;gap:4px}.unit-progress-labels .label.mastered{color:#22c55e}.unit-progress-labels .label.learning{color:#3b82f6}.unit-progress-labels .label.need{color:#ef4444}.unit-card-details{padding:0 16px 16px;border-top:1px solid #e2e8f0;margin-top:4px}.detail-section{margin-top:14px}.detail-section h4{font-size:.8rem;font-weight:700;color:var(--text-soft);margin-bottom:8px}.word-tags{display:flex;flex-wrap:wrap;gap:6px}.word-tag{font-size:.75rem;padding:4px 10px;border-radius:20px;font-weight:600}.word-tag.mastered{background:#dcfce7;color:#166534}.word-tag.learning{background:#dbeafe;color:#1d4ed8}.word-tag.need{background:#fee2e2;color:#991b1b}.word-tag small{font-size:.65rem;opacity:.7;margin-left:2px}.no-words{font-size:.8rem;color:var(--text-soft);text-align:center;padding:10px}.hard-words-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.hard-word-card{background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:10px 8px;text-align:center}.hw-word{display:block;font-size:.8rem;font-weight:700;color:var(--text);margin-bottom:4px}.hw-pct{font-size:.85rem;font-weight:800}.stats-footer{display:flex;align-items:center;justify-content:space-between;padding:14px 0}.stats-footer p{font-size:.72rem;color:var(--text-soft)}.btn-giveup{background:#f9fafb;color:var(--text-soft);border:1px solid #e5e7eb;padding:6px 14px;font-size:.8rem;border-radius:8px;cursor:pointer}.btn-giveup:hover{border-color:var(--danger);color:var(--danger)}}.chop-word-area{background:#fff;border-radius:16px;padding:24px 16px;min-height:80px;width:100%;max-width:600px;display:flex;flex-direction:column;align-items:center;gap:12px;box-shadow:0 2px 12px #0000000f}.chop-word-area.shake{animation:shake .4s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-6px)}80%{transform:translate(6px)}}.chop-word-display{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:0}.chop-chunk{display:flex;align-items:center}.chop-chunk-text{font-size:3rem;font-weight:800;color:#1e293b;letter-spacing:.05em;font-family:Georgia,serif;line-height:1;-webkit-user-select:none;user-select:none}.chop-gap{width:20px;height:56px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;margin:0 2px}.chop-gap-line{width:2px;height:100%;background:#cbd5e1;border-radius:2px;transition:all .2s}.chop-gap:hover .chop-gap-line{background:#3b82f6;width:3px}.chop-gap.cut .chop-gap-line{background:#22c55e;width:3px}.chop-gap-blade{position:absolute;font-size:1.2rem;animation:blade-drop .3s ease}@keyframes blade-drop{0%{transform:translateY(-20px) rotate(-20deg);opacity:0}to{transform:translateY(0) rotate(0);opacity:1}}.chop-answer-hint{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;animation:fadeIn .3s}.chop-syl-badge{background:#fef3c7;color:#92400e;padding:4px 10px;border-radius:8px;font-weight:600;font-size:.95rem}.chop-actions{display:flex;gap:12px;align-items:center}.chop-progress-hint{font-size:.85rem;color:#94a3b8;text-align:center}.chop-correct-msg{color:#22c55e;font-weight:600}.combine-slots{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;min-height:64px;padding:16px;background:#f8fafc;border-radius:16px;border:2px dashed #e2e8f0;width:100%;max-width:600px}.combine-slots.shake{animation:shake .4s ease-in-out}.combine-slot{width:72px;height:64px;border:2px solid #e2e8f0;border-radius:12px;display:flex;align-items:center;justify-content:center;background:#fff;transition:all .2s;cursor:grab}.combine-slot.filled{border-color:#3b82f6;background:#eff6ff}.combine-slot.correct{border-color:#22c55e;background:#f0fdf4;animation:pulse .5s}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.combine-slot-text{font-size:1.6rem;font-weight:700;color:#1e293b;font-family:Georgia,serif;pointer-events:none}.combine-slot-placeholder{font-size:1.5rem;color:#cbd5e1}.combine-hint{font-size:.8rem;color:#94a3b8}.combine-pool{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;min-height:60px;padding:12px 16px;background:#fef9ee;border-radius:12px;border:2px dashed #fde68a;width:100%;max-width:600px;cursor:default}.combine-pool-label{width:100%;text-align:center;font-size:.75rem;color:#d97706;font-weight:600;text-transform:uppercase;letter-spacing:.1em}.combine-piece{background:#fff;border:2px solid #f59e0b;border-radius:10px;padding:8px 16px;font-size:1.4rem;font-weight:700;color:#92400e;cursor:grab;-webkit-user-select:none;user-select:none;box-shadow:0 2px 6px #f59e0b33;transition:all .15s;font-family:Georgia,serif}.combine-piece:hover{background:#fffbeb;transform:translateY(-2px);box-shadow:0 4px 12px #f59e0b4d}.combine-piece:active{cursor:grabbing;transform:scale(.95)}.combine-pool-empty{color:#22c55e;font-weight:600;font-size:.9rem;display:flex;align-items:center}.phonics-level-group{width:100%;margin-bottom:8px}.phonics-level-header{display:flex;align-items:center;justify-content:space-between;padding:8px 4px 6px;border-bottom:1px solid #e2e8f0;margin-bottom:8px}.phonics-level-left{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.phonics-level-badge{background:#fef3c7;color:#92400e;font-size:.75rem;font-weight:700;padding:2px 8px;border-radius:20px;white-space:nowrap}.phonics-level-name{font-weight:700;font-size:1rem;color:#1e293b}.phonics-level-name-zh{font-size:.85rem;color:#64748b}.phonics-level-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.phonics-level-progress{font-size:.8rem;color:#94a3b8;font-weight:600}.phonics-learn-scene{align-items:center!important;justify-content:flex-start!important;padding-top:24px!important;gap:16px!important}.phonics-learn-card{display:flex;flex-direction:column;align-items:center;gap:14px;background:#fff;border-radius:20px;padding:36px 40px;box-shadow:0 4px 24px #00000014;width:min(480px,90vw);max-width:480px}.phonics-phoneme-btn{width:120px;height:120px;border-radius:20px;background:linear-gradient(135deg,#fef9c3,#fef08a);border:3px solid #facc15;display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;-webkit-user-select:none;user-select:none;transition:transform .1s,box-shadow .1s;position:relative}.phonics-phoneme-btn:active{transform:scale(.95);box-shadow:0 2px 8px #0000001f}.phonics-phoneme-letter{font-size:4rem;font-weight:900;color:#1e293b;line-height:1}.phonics-phoneme-hint{font-size:.7rem;margin-top:2px;opacity:.6}.phonics-phoneme-ipa{font-size:1.4rem;font-weight:700;color:#3b82f6;letter-spacing:.04em;margin-bottom:2px}.phonics-learn-word{font-size:2.4rem;font-weight:800;color:#1e293b;cursor:pointer;letter-spacing:.05em;transition:color .15s}.phonics-learn-word:hover{color:#3b82f6}.phonics-learn-word:active{color:#1d4ed8}.phonics-learn-phonetic{font-size:1.3rem;color:#64748b;font-family:Lucida Sans Unicode,Arial Unicode MS,sans-serif;letter-spacing:.05em}.phonics-learn-rule{font-size:.9rem;color:#475569;text-align:center;max-width:380px;line-height:1.5}.phonics-learn-examples{width:100%;border-top:1px solid #e2e8f0;padding-top:14px;display:flex;flex-direction:column;align-items:center;gap:10px}.phonics-learn-examples-label{font-size:.8rem;color:#94a3b8;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.phonics-learn-example-list{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}.phonics-learn-example-btn{padding:8px 20px;border-radius:30px;border:2px solid #cbd5e1;background:#f8fafc;font-size:1.05rem;font-weight:700;color:#334155;cursor:pointer;transition:all .15s;letter-spacing:.03em}.phonics-learn-example-btn:hover{border-color:#3b82f6;background:#eff6ff;color:#1d4ed8}.phonics-learn-example-btn:active{transform:scale(.95)}.phonics-learn-nav{display:flex;align-items:center;gap:16px;width:min(480px,90vw);max-width:480px}.phonics-learn-dots{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;flex:1;max-width:280px}.phonics-learn-dot{width:8px;height:8px;border-radius:50%;background:#e2e8f0;transition:all .2s}.phonics-learn-dot.active{background:#3b82f6;width:20px;border-radius:4px}.phonics-learn-dot.done{background:#93c5fd}.phonics-learn-mainword-row{display:flex;align-items:center;gap:14px}.phonics-learn-word{display:flex;gap:4px;flex-wrap:wrap;justify-content:center}.phonics-letter-btn{display:inline-flex;align-items:center;justify-content:center;font-size:2rem;font-weight:900;color:#1e293b;background:#f1f5f9;border:2px solid #cbd5e1;border-radius:8px;padding:4px 8px;min-width:44px;cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .12s;line-height:1}.phonics-letter-btn:hover{background:#dbeafe;border-color:#3b82f6;color:#1d4ed8;transform:scale(1.08)}.phonics-letter-btn:active{transform:scale(.92);background:#bfdbfe}.phonics-word-speak-btn{width:44px;height:44px;border-radius:50%;border:2px solid #93c5fd;background:#eff6ff;font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.phonics-word-speak-btn:hover{background:#dbeafe;border-color:#3b82f6;transform:scale(1.1)}.phonics-word-speak-btn:active{transform:scale(.9)}.phonics-letter-ipa-row{display:flex;gap:4px;justify-content:center;min-height:24px}.phonics-letter-ipa{min-width:44px;text-align:center;font-size:.9rem;color:#94a3b8;padding:2px}.phonics-learn-ipa{font-size:1.4rem;font-weight:700;color:#3b82f6;letter-spacing:.08em;margin-top:-6px;height:32px;display:flex;align-items:center;justify-content:center}.phonics-syllable-btn{display:inline-flex;align-items:center;justify-content:center;font-size:1.6rem;font-weight:900;color:#1e293b;background:#f1f5f9;border:2px solid #cbd5e1;border-radius:8px;padding:4px 10px;min-width:44px;cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .12s;line-height:1}.phonics-syllable-btn:hover{background:#dbeafe;border-color:#3b82f6;color:#1d4ed8;transform:scale(1.08)}.phonics-syllable-btn:active{transform:scale(.92);background:#bfdbfe}.phonics-syllable-btn.no-audio{background:#fef9c3;border-color:#fde047;color:#854d0e}.phonics-syllable-btn.no-audio:hover{background:#fef08a;border-color:#facc15;color:#713f12}.phonics-syllable-btn.focus{background:#fef2f2;border-color:#ef4444;color:#ef4444;box-shadow:0 0 0 2px #ef444440}.phonics-syllable-btn.focus:hover{background:#fee2e2;border-color:#dc2626;color:#dc2626;transform:scale(1.08)}.phonics-syllable-btn.focus:active{animation:phonics-pulse .25s ease-out}@keyframes phonics-pulse{0%{box-shadow:0 0 #ef4444b3}to{box-shadow:0 0 0 8px #ef444400}}.phonics-learn-example-btn .ex-hl{color:#ef4444;font-weight:900}