*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{--primary:#6366f1;--primary-dark:#4f46e5;--secondary:#ec4899;--accent:#f59e0b;--success:#10b981;--danger:#ef4444;--dark:#1f2937;--light:#f3f4f6;--text:#374151;--text-muted:#9ca3af;--safe-bottom:env(safe-area-inset-bottom,0px);--safe-top:env(safe-area-inset-top,0px);--bronze:#cd7f32;--silver:#c0c0c0;--gold:#ffd700;--platinum:#e5e4e2;--diamond:#b9f2ff}
html,body{height:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:var(--dark)}
.app-container{max-width:480px;margin:0 auto;height:100%;display:flex;flex-direction:column;background:#f8fafc;position:relative;overflow:hidden}
.app-header{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);padding:16px 20px calc(16px + var(--safe-top));color:white;flex-shrink:0}
.header-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.app-title{font-size:1.2rem;font-weight:800;display:flex;align-items:center;gap:8px}
.level-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,0.2);padding:6px 14px;border-radius:20px;font-size:0.85rem;font-weight:600;cursor:pointer;margin-bottom:8px;backdrop-filter:blur(10px)}
.xp-bar{margin-top:4px}
.xp-info{display:flex;justify-content:space-between;font-size:0.75rem;opacity:0.9;margin-bottom:4px}
.xp-progress{height:6px;background:rgba(255,255,255,0.3);border-radius:3px;overflow:hidden}
.xp-fill{height:100%;background:linear-gradient(90deg,#f59e0b,#ffd700);border-radius:3px;transition:width 0.5s ease}
.stats-bar{display:flex;background:white;padding:12px 16px;gap:8px;flex-shrink:0;border-bottom:1px solid #f3f4f6}
.stat-item{flex:1;text-align:center}
.stat-value{font-size:1.3rem;font-weight:800;color:var(--primary)}
.stat-label{font-size:0.7rem;color:var(--text-muted);margin-top:2px}
.content-area{flex:1;overflow-y:auto;padding:16px;padding-bottom:80px;-webkit-overflow-scrolling:touch}
.mode-tabs{display:flex;gap:8px;margin-bottom:16px;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch}
.mode-tab{flex-shrink:0;display:flex;align-items:center;gap:6px;padding:10px 16px;border-radius:12px;border:2px solid #e5e7eb;background:white;color:var(--text-muted);font-size:0.85rem;font-weight:600;cursor:pointer;transition:all 0.2s}
.mode-tab.active{border-color:var(--primary);background:#eef2ff;color:var(--primary)}
.mode-tab svg{width:18px;height:18px}
.flashcard-container{display:flex;justify-content:center;margin-bottom:16px}
.flashcard{width:100%;height:280px;perspective:1000px;cursor:pointer}
.flashcard-inner{position:relative;width:100%;height:100%;transition:transform 0.6s;transform-style:preserve-3d}
.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}
.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:20px;padding:32px 24px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 8px 30px rgba(99,102,241,0.15)}
.flashcard-front{background:white}
.flashcard-back{background:white;transform:rotateY(180deg)}
.word-badge{padding:4px 12px;border-radius:8px;font-size:0.75rem;font-weight:600;margin-bottom:12px}
.word-main{font-size:2.2rem;font-weight:800;color:var(--dark);margin-bottom:8px}
.word-phonetic{font-size:1rem;color:var(--text-muted);margin-bottom:12px;font-family:serif}
.word-meaning{font-size:1.6rem;font-weight:800;color:var(--primary);margin-bottom:12px}
.word-example{font-size:0.95rem;color:var(--text-muted);text-align:center;line-height:1.5;padding:0 16px;font-style:italic}
.speaker-btn{width:44px;height:44px;border-radius:50%;border:2px solid #e5e7eb;background:white;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all 0.2s}
.speaker-btn:active{transform:scale(0.9);background:#eef2ff}
.speaker-btn svg{width:22px;height:22px;color:var(--primary)}
.controls{display:flex;gap:10px;margin-top:8px}
.controls button{flex:1;padding:14px;border:none;border-radius:14px;font-size:0.95rem;font-weight:700;cursor:pointer;transition:all 0.2s}
.controls button:active{transform:scale(0.97)}
.btn-primary{background:var(--primary);color:white}
.btn-success{background:var(--success);color:white}
.btn-secondary{background:var(--light);color:var(--text)}
.spelling-container,.listening-container,.quiz-container,.speaking-container{padding:8px 0}
.speaker-btn-large{width:48px;height:48px;border-radius:50%;border:2px solid #e5e7eb;background:white;display:flex;align-items:center;justify-content:center;cursor:pointer;margin:0 auto;transition:all 0.2s}
.speaker-btn-large:active{transform:scale(0.9);background:#eef2ff}
.sub-mode-selector{display:flex;gap:8px;margin-bottom:16px;justify-content:center}
.sub-mode-btn{padding:8px 20px;border-radius:10px;border:2px solid #e5e7eb;background:white;font-size:0.85rem;font-weight:600;cursor:pointer;color:var(--text-muted);transition:all 0.2s}
.sub-mode-btn.active{border-color:var(--primary);background:#eef2ff;color:var(--primary)}
.listen-button{width:100px;height:100px;border-radius:50%;border:none;background:linear-gradient(135deg,#667eea,#764ba2);color:white;display:flex;align-items:center;justify-content:center;cursor:pointer;margin:20px auto;box-shadow:0 8px 30px rgba(102,126,234,0.4);transition:all 0.2s}
.listen-button:active{transform:scale(0.92)}
.listen-button.playing{animation:pulse 1s infinite}
@keyframes pulse{0%{transform:scale(1);box-shadow:0 8px 30px rgba(102,126,234,0.4)}50%{transform:scale(1.08);box-shadow:0 8px 40px rgba(102,126,234,0.6)}100%{transform:scale(1);box-shadow:0 8px 30px rgba(102,126,234,0.4)}}
.options-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.option-card{padding:16px;border-radius:14px;background:white;text-align:center;cursor:pointer;border:2px solid #e5e7eb;transition:all 0.2s;box-shadow:0 2px 8px rgba(0,0,0,0.04)}
.option-card:active{transform:scale(0.96);border-color:var(--primary)}
.option-card.correct{background:#d1fae5;border-color:var(--success);color:var(--success)}
.option-card.wrong{background:#fee2e2;border-color:var(--danger);color:var(--danger)}
.spelling-hint{text-align:center;margin-bottom:20px}
.spelling-phonetic{font-size:1.2rem;color:var(--text-muted);margin-bottom:6px;font-family:serif}
.spelling-meaning{font-size:1.5rem;font-weight:700;color:var(--dark);margin-bottom:12px}
.spelling-input{width:100%;padding:16px;border:3px solid #e5e7eb;border-radius:14px;font-size:1.5rem;text-align:center;font-weight:700;letter-spacing:4px;outline:none;transition:border-color 0.2s;margin-bottom:16px}
.spelling-input:focus{border-color:var(--primary)}
.spelling-input.correct{border-color:var(--success);background:#d1fae5}
.spelling-input.wrong{border-color:var(--danger);background:#fee2e2}
.spelling-actions{display:flex;gap:10px}
.hint-btn{padding:14px 20px;border-radius:14px;border:2px solid #e5e7eb;background:white;font-size:0.9rem;font-weight:600;cursor:pointer;color:var(--accent)}
.report-tabs{display:flex;gap:8px;margin-bottom:16px}
.report-tab{padding:10px 24px;border-radius:10px;border:2px solid #e5e7eb;background:white;font-size:0.85rem;font-weight:600;cursor:pointer;color:var(--text-muted);transition:all 0.2s}
.report-tab.active{border-color:var(--primary);background:#eef2ff;color:var(--primary)}
.level-progress-list{display:flex;flex-direction:column;gap:12px}
.level-progress-item{background:white;padding:16px;border-radius:16px;display:flex;align-items:center;gap:12px;box-shadow:0 2px 8px rgba(0,0,0,0.04)}
.level-icon-sm{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.3rem}
.level-info-progress{flex:1}
.level-name-row{display:flex;justify-content:space-between;margin-bottom:6px;font-size:0.9rem;font-weight:600}
.progress-bar-bg{height:8px;background:#e5e7eb;border-radius:4px;overflow:hidden}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:4px;transition:width 0.5s}
.badge-section{margin-bottom:20px}
.badge-section-title{font-size:0.95rem;font-weight:800;color:var(--dark);margin-bottom:12px}
.badge-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.badge-item{text-align:center;padding:8px 4px;border-radius:12px;cursor:pointer;transition:all 0.2s}
.badge-item.locked{opacity:0.5}
.badge-icon{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;margin:0 auto 4px;position:relative}
.badge-icon.bronze{background:linear-gradient(135deg,#cd7f32,#e8a65d)}
.badge-icon.silver{background:linear-gradient(135deg,#c0c0c0,#e8e8e8)}
.badge-icon.gold{background:linear-gradient(135deg,#ffd700,#ffed4a)}
.badge-icon.platinum{background:linear-gradient(135deg,#e5e4e2,#f5f5f5)}
.badge-icon.diamond{background:linear-gradient(135deg,#b9f2ff,#d0f7ff)}
.badge-icon.special{background:linear-gradient(135deg,#e0115f,#ff6b9d)}
.badge-lock{position:absolute;top:-4px;right:-4px;font-size:0.8rem}
.badge-name{font-size:0.6rem;color:var(--text-muted);margin-top:2px;line-height:1.2}
.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;background:white;border-top:1px solid #f3f4f6;display:flex;justify-content:space-around;padding:8px 0 calc(8px + var(--safe-bottom));z-index:1000}
.nav-btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 8px;border:none;background:none;color:var(--text-muted);font-size:0.65rem;cursor:pointer;transition:all 0.2s}
.nav-btn.active{color:var(--primary)}
.nav-btn svg{width:22px;height:22px}
.modal{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.6);z-index:2000;justify-content:center;align-items:flex-end;padding:20px;padding-bottom:calc(20px + var(--safe-bottom))}
.modal.show{display:flex}
.modal-content{background:white;border-radius:24px;padding:24px;width:100%;max-height:70vh;overflow-y:auto;animation:slideUp 0.3s ease}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
.modal-title{font-size:1.2rem;font-weight:800;margin-bottom:16px;text-align:center}
.level-grid{display:flex;flex-direction:column;gap:8px}
.level-option{display:flex;align-items:center;gap:12px;padding:14px;border-radius:14px;background:var(--light);cursor:pointer;transition:all 0.2s}
.level-option.active{border:2px solid var(--primary);background:#eef2ff}
.level-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.3rem}
.level-info h3{font-size:0.95rem;color:var(--dark)}.level-info p{font-size:0.8rem;color:var(--text-muted)}
.toast{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%) scale(0.9);background:rgba(0,0,0,0.9);color:white;padding:16px 32px;border-radius:12px;font-size:1rem;opacity:0;pointer-events:none;transition:all 0.3s;z-index:3000}
.toast.show{opacity:1;transform:translate(-50%,-50%) scale(1)}
.confetti{position:fixed;width:8px;height:8px;border-radius:50%;animation:confetti-fall 2s linear forwards;z-index:2500;pointer-events:none}
@keyframes confetti-fall{0%{transform:translateY(-20px) rotate(0deg);opacity:1}100%{transform:translateY(100vh) rotate(720deg);opacity:0}}
.badge-detail{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.8);z-index:3000;display:none;justify-content:center;align-items:center;padding:20px}
.badge-detail.show{display:flex}
.badge-detail-content{background:white;border-radius:24px;padding:32px;text-align:center;max-width:320px;width:100%}
.badge-detail-icon{width:80px;height:80px;border-radius:50%;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;font-size:2.4rem}
.badge-detail-name{font-size:1.2rem;font-weight:800;margin-bottom:8px}
.badge-detail-desc{color:var(--text-muted);font-size:0.9rem;margin-bottom:16px;line-height:1.5}
.achievement-popup{position:fixed;top:20%;left:50%;transform:translateX(-50%) translateY(-100px);background:linear-gradient(135deg,#ffd700,#ffed4a);padding:20px 32px;border-radius:20px;z-index:4000;opacity:0;pointer-events:none;transition:all 0.5s ease;text-align:center}
.achievement-popup.show{opacity:1;transform:translateX(-50%) translateY(0)}
.speaking-score-bar{display:flex;gap:8px;margin:16px 0;justify-content:center}
.score-dot{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700;border:2px solid #e5e7eb;background:white;color:var(--text-muted)}
.score-dot.active{background:var(--success);color:white;border-color:var(--success)}
.speaking-word{font-size:2rem;font-weight:800;text-align:center;color:var(--dark);margin:16px 0;letter-spacing:2px}
.mic-button{width:80px;height:80px;border-radius:50%;border:none;background:linear-gradient(135deg,var(--primary),var(--secondary));color:white;display:flex;align-items:center;justify-content:center;cursor:pointer;margin:12px auto;box-shadow:0 8px 30px rgba(99,102,241,0.4);transition:all 0.2s}
.mic-button:active{transform:scale(0.92)}
.mic-button.listening{background:linear-gradient(135deg,#ef4444,#ec4899);animation:pulse 1s infinite}
.speaking-result{text-align:center;margin:12px 0;padding:12px;border-radius:12px;font-size:1.1rem;font-weight:600}
.speaking-result.correct{background:#d1fae5;color:var(--success)}
.speaking-result.wrong{background:#fee2e2;color:var(--danger)}
.record-btn-container{text-align:center}
</style>