*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif}.container{margin:0 auto;max-width:1200px;padding:20px}@media (max-width:768px){.container{padding:15px}}@media (max-width:480px){.container{padding:5px}}.nav{align-items:center;background:#fff;border-radius:10px;box-shadow:0 2px 10px #0000001a;display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;margin-bottom:30px;padding:20px}@media (max-width:768px){.nav{gap:10px;padding:15px}.nav h2{font-size:18px!important;margin-bottom:10px!important;text-align:center;width:100%}}.nav-button{align-items:center;background:#007bff;border:none;border-radius:6px;color:#fff;cursor:pointer;display:flex;flex:1 1;font-size:16px;justify-content:center;min-width:150px;padding:12px 24px;transition:background .3s}@media (max-width:768px){.nav-button{font-size:14px;min-width:100px;padding:10px 16px}}@media (max-width:480px){.nav-button{font-size:12px;min-width:80px;padding:8px 12px}}.nav-button:hover{background:#0056b3}.nav-button.active{background:#28a745}.page{background:#fff;border-radius:10px;box-shadow:0 2px 10px #0000001a;min-height:500px;padding:30px}@media (max-width:768px){.page{border-radius:8px;padding:20px}}@media (max-width:480px){.page{border-radius:6px;min-height:400px;padding:5px}}.form-group label{font-weight:700}.form-group input{border:2px solid #ddd;border-radius:6px;padding:12px;transition:border-color .3s}.form-group input:focus{border-color:#007bff}.btn{font-size:16px;padding:12px 24px;transition:all .3s}.btn-primary:hover{background:#0056b3}.btn-success:hover{background:#218838}.message{border-radius:6px;margin-bottom:20px;padding:12px}.message.success{background:#d4edda;border:1px solid #c3e6cb;color:#155724}.message.error{background:#f8d7da;border:1px solid #f5c6cb;color:#721c24}.game-grid{grid-gap:15px;border:2px solid #000;border-radius:10px;display:grid;gap:15px;grid-template-columns:repeat(4,1fr);margin:0 auto;max-width:600px;padding:10px;width:100%}@media (max-width:768px){.game-grid{gap:12px;max-width:100%}}@media (max-width:480px){.game-grid{gap:4px;grid-template-columns:repeat(4,1fr)!important;padding:5px}}.card{word-wrap:break-word;align-items:center;aspect-ratio:1;background:#fff;border:2px solid #ddd;border-radius:10px;cursor:pointer;display:flex;font-size:16px;font-weight:700;justify-content:center;min-height:100px;padding:10px;text-align:center;transition:all .3s;word-break:break-word}.nav-buttons{display:flex;gap:10px}@media (max-width:768px){.card{border-radius:8px;font-size:14px;min-height:80px;padding:8px}.nav-buttons{width:100%}}@media (max-width:480px){.card{border-radius:6px;font-size:12px;line-height:1.2;min-height:70px;padding:1px}.nav-buttons{display:flex;flex-direction:row;flex-wrap:wrap}.nav-button{min-width:48%;width:48%}}.card.selected,.card:hover{border-color:#007bff}.card.selected{background:#e3f2fd}.card.matched{background:#d4edda;border-color:#28a745;cursor:default;opacity:0}.card.wrong{animation:shake .5s;background:#f8d7da;border-color:#dc3545}.card.english{background:linear-gradient(135deg,#f8fbff,#e8f4fd);border-color:#90caf9;color:#1976d2}.card.vietnamese{background:linear-gradient(135deg,#fdf8ff,#f5e8f7);border-color:#ce93d8;color:#8e24aa}.card.english:hover{background:linear-gradient(135deg,#e8f4fd,#d0e7ff);border-color:#64b5f6;box-shadow:0 4px 15px #90caf926}.card.vietnamese:hover{background:linear-gradient(135deg,#f5e8f7,#f0d0f8);border-color:#ba68c8;box-shadow:0 4px 15px #ce93d826}.card.english.selected{background:linear-gradient(135deg,#d0e7ff,#b8e6ff);border-color:#000;color:#000}.card.vietnamese.selected{background:linear-gradient(135deg,#f0d0f8,#e8c5ed);border-color:#000;color:#000}@media (max-width:768px){.card.english{background:linear-gradient(135deg,#f8fbff,#e8f4fd);border-color:#90caf9}.card.vietnamese{background:linear-gradient(135deg,#fdf8ff,#f5e8f7);border-color:#ce93d8}}@media (max-width:480px){.card.english{background:linear-gradient(135deg,#fafcff,#f0f8ff);border-color:#81c784}.card.vietnamese{background:linear-gradient(135deg,#fef9ff,#faf0fc);border-color:#c8a6c7}}@media (max-width:768px){.card-type-legend{gap:15px!important;margin-bottom:15px!important}.legend-item{font-size:14px!important;padding:6px 12px!important}}@media (max-width:480px){.card-type-legend{align-items:center!important;flex-direction:column!important;gap:10px!important;margin-bottom:15px!important}.legend-item{font-size:13px!important;padding:5px 10px!important}}@keyframes shake{0%,20%,40%,60%,80%{transform:translateX(-5px)}10%,30%,50%,70%,90%{transform:translateX(5px)}}.stats{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;margin-bottom:20px}@media (max-width:768px){.stats{gap:15px;justify-content:space-around}}@media (max-width:480px){.stats{align-items:center;flex-direction:row;gap:10px}.pagination-info{flex-direction:column;width:100%}}.stat-item{background:#f8f9fa;border-radius:8px;min-width:120px;padding:15px;text-align:center}@media (max-width:768px){.stat-item{min-width:100px;padding:12px}}@media (max-width:480px){.stat-item{max-width:200px;min-width:80px;padding:10px;width:48%}}.stat-item h3{color:#007bff;margin-bottom:5px}.loading{color:#666}.game-complete,.loading{padding:40px;text-align:center}.game-complete h2{color:#28a745;margin-bottom:20px}.pronunciation-input-group{align-items:flex-start;display:flex;gap:8px}.pronunciation-input{border:2px solid #ddd;border-radius:6px;flex:1 1;font-size:16px;padding:12px;transition:border-color .3s;width:100%}.pronunciation-input:focus{border-color:#007bff;outline:none}.pronunciation-btn{border:none;border-radius:6px;color:#fff;font-size:14px;min-width:120px;padding:12px 16px;transition:all .3s;white-space:nowrap}@media (max-width:768px){.pronunciation-btn{font-size:13px;min-width:100px;padding:10px 14px}}@media (max-width:480px){.pronunciation-input-group{flex-direction:column;gap:10px}.pronunciation-input{font-size:14px;padding:10px}.pronunciation-btn{font-size:14px;min-width:auto;padding:12px;width:100%}}.pagination-controls{align-items:center;display:flex;gap:8px;margin:15px 0}.pagination-btn{background:#fff;border:1px solid #ddd;border-radius:6px;color:#666;cursor:pointer;font-size:13px;padding:8px 12px;transition:all .2s ease}.pagination-btn:hover:not(:disabled){background:#f8f9fa;border-color:#007bff;color:#007bff}.pagination-btn:disabled{background:#f8f9fa;cursor:not-allowed;opacity:.5}.pagination-info{color:#666;font-size:14px;margin:0 10px}.page-numbers{gap:5px;margin:0 10px}.page-number,.page-numbers{align-items:center;display:flex}.page-number{background:#fff;border:1px solid #ddd;border-radius:6px;color:#666;cursor:pointer;font-size:13px;font-weight:500;height:32px;justify-content:center;min-width:32px;padding:0;transition:all .2s ease}.page-number:hover:not(:disabled){background:#f8f9fa;border-color:#007bff;color:#007bff;transform:translateY(-1px)}.page-number.current{background:#007bff;border-color:#007bff;color:#fff;cursor:default}.page-number:disabled{cursor:not-allowed;opacity:.6}.page-ellipsis{color:#999;font-size:14px;padding:0 8px;-webkit-user-select:none;user-select:none}.btn{border:none;border-radius:6px;cursor:pointer;display:inline-block;font-size:14px;font-weight:500;padding:10px 16px;text-align:center;text-decoration:none;transition:all .2s ease}.btn:disabled{cursor:not-allowed;opacity:.6}.btn-primary{background:#007bff;color:#fff}.btn-primary:hover:not(:disabled){background:#0056b3;transform:translateY(-1px)}.btn-success{background:#28a745;color:#fff}.btn-success:hover:not(:disabled){background:#1e7e34;transform:translateY(-1px)}.btn-secondary{background:#6c757d;color:#fff}.btn-secondary:hover:not(:disabled){background:#545b62;transform:translateY(-1px)}.btn-info{background:#17a2b8;color:#fff}.btn-info:hover:not(:disabled){background:#117a8b;transform:translateY(-1px)}.btn-danger{background:#dc3545;color:#fff}.btn-danger:hover:not(:disabled){background:#c82333;transform:translateY(-1px)}.btn-warning{background:#ffc107;border-color:#ffc107;color:#212529}.btn-warning:hover:not(:disabled){background:#e0a800;border-color:#d39e00;transform:translateY(-1px)}.flashcard{transition:all .3s ease;-webkit-user-select:none;user-select:none}.flashcard:hover{box-shadow:0 6px 25px #00000026!important;transform:scale(1.02)!important}.flashcard:active{transform:scale(.98)!important}@media (max-width:768px){.flashcard{height:220px!important;max-width:350px!important;padding:15px!important;width:100%!important}.flashcard div:first-child{font-size:24px!important}}@media (max-width:480px){.flashcard{height:200px!important;max-width:300px!important;padding:12px!important;width:100%!important}.flashcard div:first-child{font-size:20px!important}}@media (max-width:768px){.page-numbers{flex-wrap:wrap;justify-content:center;margin:5px 0}.page-number{font-size:12px;height:28px;min-width:28px}}@media (max-width:480px){.page-numbers{gap:3px}.page-number{font-size:11px;height:24px;min-width:24px}.page-ellipsis{font-size:12px;padding:0 4px}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.error-message{background:#f8d7da;border:1px solid #f5c6cb;border-radius:6px;color:#721c24}.error-message,.success-message{margin:20px 0;padding:15px;text-align:center}.success-message{background:#d4edda;border:1px solid #c3e6cb;border-radius:6px;color:#155724}.vocab-card{background:#fff;border:1px solid #e9ecef;border-radius:8px;box-shadow:0 2px 4px #0000001a;margin-bottom:15px;padding:20px;transition:all .2s ease}.vocab-card:hover{box-shadow:0 4px 8px #00000026}.answer-btn{align-items:center;background:#fff;border:2px solid #e9ecef;border-radius:10px;box-shadow:0 2px 4px #0000001a;color:#333;cursor:pointer;display:flex;font-size:16px;justify-content:center;min-height:60px;padding:15px 20px;text-align:center;transition:all .3s ease}.answer-btn:hover:not(:disabled){background:#f8f9fa;border-color:#007bff;box-shadow:0 4px 12px #007bff33;transform:translateY(-2px)}.answer-btn.selected{background:#e3f2fd;border-color:#007bff;color:#1976d2;font-weight:700}.answer-btn.correct{animation:correct-bounce .6s ease;background:#d4edda;border-color:#28a745;color:#155724;font-weight:700}.answer-btn.wrong{animation:wrong-shake .6s ease;background:#f8d7da;border-color:#dc3545;color:#721c24;font-weight:700}.answer-btn.disabled{cursor:not-allowed;opacity:.6}.question-card{background:#fff;border:2px solid #007bff;border-radius:15px;box-shadow:0 4px 20px #0000001a;margin:0 auto 30px;padding:30px;transition:transform .2s ease}.question-card:hover{transform:scale(1.02)}@keyframes correct-bounce{0%,20%,60%,to{transform:translateY(0)}40%{transform:translateY(-10px)}80%{transform:translateY(-5px)}}@keyframes wrong-shake{0%,to{transform:translateX(0)}10%,30%,50%,70%,90%{transform:translateX(-5px)}20%,40%,60%,80%{transform:translateX(5px)}}@media (max-width:768px){.question-card{margin-bottom:20px;padding:20px}.answer-btn{font-size:15px;min-height:55px;padding:12px 16px}}@media (max-width:480px){.question-card{margin-bottom:15px;padding:15px}.answer-btn{font-size:14px;min-height:50px;padding:10px 12px}.stats{gap:8px}.stat-item{min-width:70px;padding:8px}}.auth-page{align-items:center;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;flex-direction:column;justify-content:center;min-height:100vh;padding:20px}.auth-header{color:#fff;margin-bottom:40px;text-align:center}.auth-header h1{font-size:2.5rem;margin-bottom:10px;text-shadow:0 2px 10px #0003}.auth-header p{font-size:1.1rem;opacity:.9}.auth-container{margin:0 auto;max-width:400px;width:100%}.auth-form{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fff;border-radius:20px;box-shadow:0 10px 40px #0000001a;padding:40px}.auth-form h2{color:#333;font-size:1.8rem;margin-bottom:30px;text-align:center}.form-group{margin-bottom:20px}.form-group label{color:#333;display:block;font-weight:500;margin-bottom:8px}.form-group input{border:2px solid #e1e5e9;border-radius:10px;font-size:16px;padding:12px 16px;transition:border-color .3s ease;width:100%}.form-group input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea1a;outline:none}.form-hint{color:#666;display:block;font-size:.9rem;margin-top:5px}.auth-button{background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:10px;color:#fff;cursor:pointer;font-size:16px;font-weight:500;margin-bottom:20px;padding:14px;transition:transform .2s ease,box-shadow .2s ease;width:100%}.auth-button:hover:not(:disabled){box-shadow:0 5px 20px #667eea4d;transform:translateY(-2px)}.auth-button:disabled{cursor:not-allowed;opacity:.6;transform:none}.auth-switch{text-align:center}.auth-switch p{color:#666;margin:0}.auth-switch-external{margin-top:20px;text-align:center}.auth-switch-external p{color:#fff;margin:0}.link-button{background:none;border:none;cursor:pointer;font-size:inherit}.link-button,a.link-button{color:#667eea;font-weight:500;text-decoration:underline}.link-button:hover:not(:disabled),a.link-button:hover{color:#764ba2}.link-button:disabled{cursor:not-allowed;opacity:.6}.error-message{background:#fff5f5;border:1px solid #fed7d7;border-radius:8px;color:#c53030;font-size:14px;margin-bottom:20px;padding:12px 16px}.loading-container{align-items:center;background:#f5f5f5;display:flex;justify-content:center;min-height:100vh}.loading-spinner{color:#667eea;font-size:1.5rem;text-align:center}.user-info{align-items:center;display:flex;gap:15px;margin-left:auto}.username{color:#333;font-size:14px;font-weight:500}.logout-button{background:#ff6b6b;border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:14px;padding:8px 16px;transition:background-color .2s ease}.logout-button:hover{background:#ff5252}.migration-container{align-items:center;display:flex;flex-direction:column;gap:5px;position:relative}.migration-button{background:#4caf50;border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:12px;font-weight:500;padding:8px 12px;transition:background-color .2s ease,transform .1s ease;white-space:nowrap}.migration-button:hover:not(:disabled){background:#45a049;transform:translateY(-1px)}.migration-button:disabled{background:#ccc;cursor:not-allowed;transform:none}.migration-message{border-radius:6px;font-size:11px;font-weight:500;left:50%;margin-top:5px;max-width:300px;padding:8px 12px;position:absolute;text-align:center;top:100%;transform:translateX(-50%);white-space:nowrap;z-index:1000}.migration-message.success{background:#d4edda;border:1px solid #c3e6cb;color:#155724}.migration-message.error{background:#f8d7da;border:1px solid #f5c6cb;color:#721c24}@media (max-width:768px){.auth-header h1{font-size:2rem}.auth-form{padding:30px 25px}.nav{flex-direction:column;gap:15px}.user-info{flex-wrap:wrap;justify-content:center;margin-left:0;width:100%}.migration-button{font-size:10px;padding:6px 8px}.migration-message{font-size:10px;max-width:250px}}@media (max-width:480px){.auth-page{padding:15px}.auth-header h1{font-size:1.8rem}.auth-form{padding:25px 20px}}
/*# sourceMappingURL=main.ebe771ba.css.map*/