*{box-sizing:border-box;margin:0;padding:0}:root{--primary: #7c4dff;--primary-light: #b388ff;--secondary: #e040fb;--secondary-light: #ff80ab;--success: #4caf50;--warning: #ff9800;--error: #f44336;--bg-gradient: linear-gradient(135deg, #e8eaf6 0%, #f3e5f5 50%, #e1f5fe 100%);--card-shadow: 0 4px 20px rgba(0, 0, 0, .08);--radius: 16px;--radius-sm: 12px}body{font-family:Nunito,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-gradient);min-height:100vh;color:#333;-webkit-font-smoothing:antialiased}.app-container{min-height:100vh;padding-bottom:80px}.main-content{padding:16px;max-width:520px;margin:0 auto}.card{background:#fff;border-radius:var(--radius);padding:20px;box-shadow:var(--card-shadow);margin-bottom:16px}.card-gradient-purple{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);color:#fff}.card-gradient-pink{background:linear-gradient(135deg,var(--secondary) 0%,var(--secondary-light) 100%);color:#fff}.header{background:#fff;padding:14px 16px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 10px #0000000d;position:sticky;top:0;z-index:50}.header-user{display:flex;align-items:center;gap:10px}.header-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:16px}.header-info{line-height:1.3}.header-name{font-weight:700;font-size:15px}.header-level{font-size:12px;color:#666}.header-score{text-align:right}.header-score-value{font-size:18px;font-weight:800;color:var(--primary)}.header-score-label{font-size:11px;color:#666}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:#fff;padding:10px 20px;display:flex;justify-content:space-around;box-shadow:0 -4px 20px #00000014;z-index:100}.nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;cursor:pointer;padding:8px 20px;border-radius:var(--radius-sm);transition:all .2s;color:#666}.nav-item:hover{background:#f5f5f5}.nav-item.active{background:#f3e5f5;color:var(--primary)}.nav-item-icon{font-size:22px}.nav-item-label{font-size:11px;font-weight:600}.btn{border:none;border-radius:var(--radius-sm);padding:14px 24px;font-size:15px;font-weight:700;cursor:pointer;transition:all .2s;font-family:inherit;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.btn:active{transform:translateY(0)}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff}.btn-secondary{background:linear-gradient(135deg,var(--secondary),var(--secondary-light));color:#fff}.btn-success{background:#c8e6c9;color:#2e7d32}.btn-warning{background:#fff9c4;color:#f57f17}.btn-error{background:#ffcdd2;color:#c62828}.btn-ghost{background:transparent;color:var(--primary)}.btn-full{width:100%}.input{width:100%;padding:14px 18px;border:2px solid #e0e0e0;border-radius:var(--radius-sm);font-size:15px;font-family:inherit;outline:none;transition:border-color .2s}.input:focus{border-color:var(--primary)}.input-group{margin-bottom:14px}.input-label{display:block;margin-bottom:6px;font-weight:600;font-size:14px;color:#555}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}.stat-card{background:#fff;border-radius:var(--radius);padding:14px;text-align:center;box-shadow:var(--card-shadow)}.stat-value{font-size:24px;font-weight:800}.stat-label{font-size:11px;color:#666;margin-top:2px}.progress-bar{height:8px;background:#e0e0e0;border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary));transition:width .3s ease}.topic-item{background:#fff;border-radius:var(--radius);padding:14px 18px;margin-bottom:10px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 10px #0000000a;transition:all .2s}.topic-item:hover{transform:translate(4px);box-shadow:0 4px 15px #00000014}.topic-name{font-weight:700;font-size:14px;color:#333}.topic-meta{font-size:11px;color:#666;margin-top:2px}.topic-progress{display:flex;align-items:center;gap:10px}.topic-progress-bar{width:50px;height:5px;background:#e0e0e0;border-radius:3px;overflow:hidden}.topic-progress-fill{height:100%;background:var(--primary);transition:width .3s}.topic-progress-fill.complete{background:var(--success)}.topic-percent{font-size:11px;color:#999;min-width:30px;text-align:right}.theme-header{font-size:13px;font-weight:700;color:var(--primary);margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid #e0e0e0}.flashcard-container{perspective:1000px;cursor:pointer;width:100%;max-width:480px;margin:0 auto}.flashcard{width:100%;height:280px;position:relative;transform-style:preserve-3d;transition:transform .6s}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:20px;padding:24px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;box-shadow:0 10px 40px #0000001a}.flashcard-front{background:linear-gradient(135deg,#e8eaf6,#c5cae9)}.flashcard-back{background:linear-gradient(135deg,#f3e5f5,#e1bee7);transform:rotateY(180deg)}.flashcard-label{font-size:12px;font-weight:600;margin-bottom:12px;text-transform:uppercase;letter-spacing:1px}.flashcard-front .flashcard-label{color:#5c6bc0}.flashcard-back .flashcard-label{color:#8e24aa}.flashcard-content{font-size:17px;line-height:1.5;color:#333}.flashcard-back .flashcard-content{font-size:26px;font-weight:700;color:#4a148c}.flashcard-hint{margin-top:20px;font-size:12px;color:#999}.response-buttons{display:flex;gap:10px;margin-top:20px}.response-buttons .btn{flex:1;padding:12px 8px;font-size:13px}.booster-banner{background:linear-gradient(135deg,gold,#ffb300);color:#333;padding:10px;text-align:center;font-weight:700}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal{background:#fff;border-radius:24px;padding:32px;text-align:center;max-width:340px;width:100%;animation:modalPop .3s ease-out}@keyframes modalPop{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.modal-icon{font-size:56px;margin-bottom:12px}.modal-title{font-size:24px;font-weight:800;margin-bottom:8px}.modal-text{color:#666;margin-bottom:24px;line-height:1.5}.auth-container{min-height:100vh;padding:20px;display:flex;flex-direction:column;align-items:center}.auth-header{text-align:center;margin-bottom:30px;padding-top:20px}.auth-title{font-size:32px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-top:16px}.auth-subtitle{color:#666;margin-top:4px}.auth-card{background:#fff;border-radius:24px;padding:32px;box-shadow:0 20px 60px #0000001a;width:100%;max-width:380px}.auth-toggle{text-align:center;margin-top:16px;color:#666}.auth-toggle-link{color:var(--primary);cursor:pointer;font-weight:600}.auth-toggle-link:hover{text-decoration:underline}.level-selector{display:flex;gap:10px;margin-bottom:16px}.level-option{flex:1;padding:14px;border:2px solid #e0e0e0;border-radius:var(--radius-sm);text-align:center;cursor:pointer;transition:all .2s}.level-option:hover{border-color:#ccc}.level-option.selected{border-color:var(--primary);background:#f3e5f5}.level-icon{font-size:24px;margin-bottom:4px}.level-name{font-weight:700;font-size:14px}.level-count{font-size:11px;color:#666}.error-message{background:#ffebee;color:#c62828;padding:12px 16px;border-radius:var(--radius-sm);margin-bottom:16px;font-size:14px}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}@keyframes glow{0%,to{box-shadow:0 0 20px #7c4dff4d}50%{box-shadow:0 0 30px #7c4dff80}}.animate-bounce{animation:bounce 2s ease-in-out infinite}.animate-pulse{animation:pulse 2s ease-in-out infinite}.animate-glow{animation:glow 2s ease-in-out infinite}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.mt-1{margin-top:4px}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-5{margin-top:20px}.mb-1{margin-bottom:4px}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-5{margin-bottom:20px}.font-bold{font-weight:700}.font-extrabold{font-weight:800}.text-sm{font-size:12px}.text-xs{font-size:11px}.text-primary{color:var(--primary)}.text-secondary{color:var(--secondary)}.text-success{color:var(--success)}.text-warning{color:var(--warning)}.text-muted{color:#666}