*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}:root{--primary-50:#fff7ed;--primary-100:#ffedd5;--primary-200:#fed7aa;--primary-300:#fdba74;--primary-400:#fb923c;--primary-500:#f97316;--primary-600:#ea580c;--primary-700:#c2410c;--primary-gradient:linear-gradient(90deg, #ffb74d, #f97316);--primary-gradient-deep:linear-gradient(135deg, #ff9800, #f4511e);--success-50:#f0fdf4;--success-100:#dcfce7;--success-500:#22c55e;--success-600:#16a34a;--warning-50:#fffbeb;--warning-100:#fef3c7;--warning-500:#f59e0b;--warning-600:#d97706;--danger-50:#fef2f2;--danger-100:#fee2e2;--danger-500:#ef4444;--danger-600:#dc2626;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--sidebar-width:280px;--header-height:70px;--card-radius:16px;--btn-radius:12px;--shadow-sm:0 2px 8px #0000000f;--shadow-md:0 4px 16px #00000014;--shadow-lg:0 8px 32px #0000001a}body{background:var(--gray-50);color:var(--gray-800);-webkit-overflow-scrolling:touch;height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;overflow:hidden}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--gray-100);border-radius:10px}::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:10px;transition:all .3s}::-webkit-scrollbar-thumb:hover{background:var(--gray-400)}.app-container{width:100vw;height:100vh;display:flex;position:relative}.mobile-mask{z-index:998;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#00000080;display:none;position:fixed;inset:0}.mobile-mask.show{display:block}.sidebar{width:var(--sidebar-width);border-right:1px solid var(--gray-200);z-index:999;background:#fff;flex-direction:column;flex-shrink:0;padding:24px 16px;transition:transform .3s;display:flex}.sidebar-logo{cursor:pointer;align-items:center;gap:12px;padding:0 8px 32px;display:flex}.logo-icon{background:var(--primary-gradient);color:#fff;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:48px;height:48px;font-size:24px;font-weight:700;display:flex}.logo-text h2{color:var(--gray-800);font-size:20px;font-weight:700}.logo-text p{color:var(--gray-500);font-size:13px}.sidebar-nav{-webkit-overflow-scrolling:touch;flex-direction:column;flex:1;gap:4px;display:flex;overflow-y:auto}.nav-item{border-radius:var(--btn-radius);cursor:pointer;color:var(--gray-600);text-align:left;background:0 0;border:none;align-items:center;gap:12px;width:100%;min-height:48px;padding:14px 16px;font-size:15px;text-decoration:none;transition:all .3s;display:flex}.nav-item i{text-align:center;flex-shrink:0;width:24px;font-size:20px}.nav-item:hover{background:var(--primary-50);color:var(--primary-600)}.nav-item.active{background:var(--primary-50);color:var(--primary-600);font-weight:600}.sidebar-footer-card{background:var(--primary-50);border-radius:var(--card-radius);flex-shrink:0;margin-top:24px;padding:16px}.sidebar-footer-card h4{color:var(--gray-800);margin-bottom:8px;font-size:14px;font-weight:600}.sidebar-footer-card p{color:var(--gray-600);margin-bottom:12px;font-size:13px}.tag-group{flex-wrap:wrap;gap:8px;display:flex}.tag{color:var(--primary-600);background:#fff;border-radius:20px;padding:4px 10px;font-size:12px;font-weight:500}.main-container{flex-direction:column;flex:1;min-width:0;height:100vh;display:flex;overflow:hidden}.top-header{height:var(--header-height);border-bottom:1px solid var(--gray-200);background:#fff;flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:0 16px;display:flex}.mobile-menu-btn{background:var(--gray-50);cursor:pointer;border:none;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;display:none}.mobile-menu-btn i{color:var(--gray-700);font-size:20px}.header-welcome{flex:1;align-items:center;gap:12px;min-width:0;display:flex}.header-welcome h3{color:var(--gray-800);white-space:nowrap;text-overflow:ellipsis;font-size:17px;font-weight:600;overflow:hidden}.grade-tag{background:var(--primary-50);color:var(--primary-600);border-radius:20px;flex-shrink:0;padding:4px 10px;font-size:12px;font-weight:500}.header-right{flex-shrink:0;align-items:center;gap:12px;display:flex}.stats-item{cursor:pointer;border-radius:8px;align-items:center;gap:6px;min-height:40px;padding:8px 10px;transition:all .3s;display:flex}.stats-item:hover{background:var(--gray-100)}.stats-item i{color:var(--primary-500);font-size:16px}.stats-item span{color:var(--gray-700);white-space:nowrap;font-size:14px;font-weight:500}.icon-btn{background:var(--gray-50);cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;transition:all .3s;display:flex;position:relative}.icon-btn:hover{background:var(--gray-100)}.icon-btn i{color:var(--gray-600);font-size:18px}.badge-dot{background:var(--danger-500);border:2px solid #fff;border-radius:50%;width:10px;height:10px;position:absolute;top:6px;right:6px}.user-avatar{cursor:pointer;border-radius:8px;align-items:center;gap:8px;min-height:40px;padding:8px 10px;transition:all .3s;display:flex}.user-avatar:hover{background:var(--gray-100)}.avatar-img{background:var(--primary-gradient);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:14px;font-weight:700;display:flex}.user-avatar span{color:var(--gray-700);white-space:nowrap;font-size:14px;font-weight:500}.content-wrapper{-webkit-overflow-scrolling:touch;flex:1;padding:16px;overflow-y:auto}.module{display:none}.module.active{display:block}.card{border-radius:var(--card-radius);box-shadow:var(--shadow-sm);border:1px solid var(--gray-100);background:#fff;transition:all .3s}.card:hover{box-shadow:var(--shadow-md)}.welcome-banner{background:var(--primary-gradient-deep);border-radius:var(--card-radius);color:#fff;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px;padding:24px 20px;display:flex;position:relative;overflow:hidden}.welcome-banner:before{content:"";background:#ffffff1a;border-radius:50%;width:200px;height:200px;position:absolute;top:-50px;right:-50px}.welcome-banner:after{content:"";background:#ffffff14;border-radius:50%;width:150px;height:150px;position:absolute;bottom:-80px;right:100px}.banner-content{z-index:1;flex:1}.banner-content h1{margin-bottom:10px;font-size:24px;font-weight:700;line-height:1.2}.banner-content p{opacity:.9;margin-bottom:16px;font-size:14px;line-height:1.5}.banner-tags{flex-wrap:wrap;gap:10px;display:flex}.banner-tag{white-space:nowrap;background:#fff3;border-radius:20px;align-items:center;gap:6px;padding:5px 12px;font-size:12px;display:flex}.banner-score{z-index:1;text-align:center;flex-shrink:0}.score-circle{background:#fff3;border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:80px;height:80px;margin-bottom:8px;display:flex}.score-circle .score-num{font-size:28px;font-weight:700;line-height:1}.score-circle .score-text{opacity:.9;font-size:12px}.stats-grid{grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px;display:grid}.stats-card{justify-content:space-between;align-items:flex-start;padding:20px 16px;display:flex}.stats-card-info h4{color:var(--gray-500);margin-bottom:10px;font-size:13px;font-weight:500}.stats-card-info .stats-num{color:var(--gray-800);margin-bottom:6px;font-size:24px;font-weight:700;line-height:1}.stats-card-info .stats-desc{font-size:12px}.stats-desc.up{color:var(--success-600)}.stats-card-icon{border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;display:flex}.icon-blue{color:#3b82f6;background:#eff6ff}.icon-green{color:#22c55e;background:#f0fdf4}.icon-yellow{color:#f59e0b;background:#fffbeb}.icon-red{color:#ef4444;background:#fef2f2}.stats-card-icon i{font-size:20px}.two-col-grid{grid-template-columns:2fr 1fr;gap:20px;margin-bottom:20px;display:grid}.module-title{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.module-title h3{color:var(--gray-800);align-items:center;gap:6px;font-size:18px;font-weight:600;display:flex}.module-title h3 i{color:var(--primary-500);font-size:18px}.link-btn{color:var(--primary-600);cursor:pointer;white-space:nowrap;font-size:14px;font-weight:500;text-decoration:none;transition:all .3s}.link-btn:hover{color:var(--primary-700)}.weakness-card{padding:20px 16px}.weakness-list{flex-direction:column;gap:16px;margin-bottom:16px;display:flex}.weakness-item{flex-direction:column;gap:8px;display:flex}.weakness-header{justify-content:space-between;align-items:center;display:flex}.weakness-name{color:var(--gray-700);font-size:14px;font-weight:500}.weakness-score{font-size:14px;font-weight:600}.score-low{color:var(--danger-600)}.score-medium{color:var(--warning-600)}.score-high{color:var(--success-600)}.progress-bar{background:var(--gray-100);border-radius:10px;width:100%;height:6px;overflow:hidden}.progress-fill{border-radius:10px;height:100%;transition:width .6s}.progress-low{background:var(--danger-500)}.progress-medium{background:var(--warning-500)}.progress-high{background:var(--success-500)}.weakness-tip{background:var(--warning-50);border-radius:12px;align-items:flex-start;gap:8px;padding:14px;display:flex}.weakness-tip i{color:var(--warning-600);flex-shrink:0;margin-top:2px;font-size:16px}.weakness-tip p{color:var(--gray-700);font-size:13px;line-height:1.5}.record-card{padding:20px 16px}.record-list{flex-direction:column;gap:12px;display:flex}.record-item{background:var(--gray-50);border-radius:12px;padding:14px}.record-item-title{color:var(--gray-800);margin-bottom:6px;font-size:14px;font-weight:500}.record-item-footer{justify-content:space-between;align-items:center;display:flex}.record-time{color:var(--gray-500);font-size:12px}.record-tag{border-radius:20px;padding:3px 8px;font-size:11px;font-weight:500}.tag-green{background:var(--success-50);color:var(--success-600)}.tag-yellow{background:var(--warning-50);color:var(--warning-600)}.tag-gray{background:var(--gray-100);color:var(--gray-600)}.practice-grid{grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:20px;display:grid}.practice-card{cursor:pointer;justify-content:space-between;align-items:center;gap:12px;padding:20px 16px;display:flex}.practice-card:hover{transform:translateY(-2px)}.practice-info{flex:1;min-width:0}.practice-info .type-tag{background:var(--primary-50);color:var(--primary-600);border-radius:6px;margin-bottom:10px;padding:3px 8px;font-size:12px;font-weight:500;display:inline-block}.practice-info h4{color:var(--gray-800);margin-bottom:6px;font-size:16px;font-weight:600;line-height:1.3}.practice-info p{color:var(--gray-600);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:10px;font-size:13px;line-height:1.4;display:-webkit-box;overflow:hidden}.practice-meta{flex-wrap:wrap;gap:12px;display:flex}.meta-item{color:var(--gray-500);white-space:nowrap;align-items:center;gap:4px;font-size:12px;display:flex}.practice-arrow{background:var(--primary-50);width:36px;height:36px;color:var(--primary-600);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;transition:all .3s;display:flex}.practice-card:hover .practice-arrow{background:var(--primary-600);color:#fff;transform:translate(2px)}.page-header{margin-bottom:20px}.page-header h2{color:var(--gray-800);align-items:center;gap:8px;margin-bottom:6px;font-size:22px;font-weight:700;line-height:1.3;display:flex}.page-header h2 i{color:var(--primary-500);font-size:22px}.page-header p{color:var(--gray-500);font-size:14px;line-height:1.4}.page-header-top{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.header-tag-group{flex-direction:column;flex-shrink:0;align-items:flex-end;gap:4px;display:flex}.ai-tag{background:var(--primary-50);color:var(--primary-600);white-space:nowrap;border-radius:20px;align-items:center;gap:4px;padding:3px 8px;font-size:11px;font-weight:500;display:flex}.upload-area{border:2px dashed var(--gray-300);border-radius:var(--card-radius);text-align:center;cursor:pointer;background:var(--gray-50);padding:60px 20px;transition:all .3s}.upload-area:hover{border-color:var(--primary-400);background:var(--primary-50)}.upload-icon{background:var(--primary-50);border-radius:50%;justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 16px;display:flex}.upload-icon i{color:var(--primary-500);font-size:28px}.upload-area h3{color:var(--gray-800);margin-bottom:10px;font-size:18px;font-weight:600}.upload-area p{color:var(--gray-500);margin-bottom:20px;font-size:14px;line-height:1.5}.upload-tags{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.upload-tags .tag{background:var(--gray-100);color:var(--gray-600)}.upload-input{display:none}.tab-header{border-bottom:1px solid var(--gray-200);-webkit-overflow-scrolling:touch;scrollbar-width:none;margin-bottom:20px;display:flex;overflow-x:auto}.tab-header::-webkit-scrollbar{display:none}.tab-btn{color:var(--gray-500);cursor:pointer;white-space:nowrap;background:0 0;border:none;flex-shrink:0;padding:12px 24px;font-size:15px;font-weight:500;transition:all .3s;position:relative}.tab-btn.active{color:var(--primary-600)}.tab-btn.active:after{content:"";background:var(--primary-gradient);border-radius:3px 3px 0 0;width:100%;height:3px;position:absolute;bottom:-1px;left:0}.tab-content{display:none}.tab-content.active{display:block}.form-textarea{border:1px solid var(--gray-200);border-radius:var(--card-radius);resize:vertical;-webkit-appearance:none;width:100%;min-height:300px;padding:16px;font-family:inherit;font-size:15px;line-height:1.6;transition:all .3s}.form-textarea:focus{border-color:var(--primary-400);outline:none;box-shadow:0 0 0 3px #f973161a}.btn-group{flex-wrap:wrap;gap:12px;margin-top:16px;display:flex}.btn{border-radius:var(--btn-radius);cursor:pointer;border:none;justify-content:center;align-items:center;gap:6px;min-height:44px;padding:12px 24px;font-family:inherit;font-size:15px;font-weight:500;transition:all .3s;display:inline-flex}.btn-primary{background:var(--primary-gradient);color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 12px #f973164d}.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-secondary{background:var(--gray-100);color:var(--gray-700);border:1px solid var(--gray-300)}.btn-secondary:hover{background:var(--gray-200)}.btn-large{padding:14px 32px;font-size:16px}.btn-block{justify-content:center;width:100%}.practice-type-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.type-card{cursor:pointer;padding:20px 16px}.type-card:hover{transform:translateY(-2px)}.type-card-header{justify-content:space-between;align-items:flex-start;margin-bottom:12px;display:flex}.type-card-header h4{color:var(--gray-800);font-size:16px;font-weight:600}.type-count-tag{background:var(--primary-50);color:var(--primary-600);white-space:nowrap;border-radius:20px;padding:3px 8px;font-size:12px;font-weight:500}.type-mastery{align-items:center;gap:8px;margin-bottom:6px;display:flex}.type-mastery span{color:var(--gray-600);font-size:13px}.type-mastery .mastery-num{color:var(--warning-600);font-weight:600}.game-progress-banner{background:var(--primary-gradient-deep);border-radius:var(--card-radius);color:#fff;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px;padding:24px 20px;display:flex}.progress-info{flex:1}.progress-info h3{margin-bottom:12px;font-size:18px;font-weight:600}.progress-num{margin-bottom:12px;font-size:36px;font-weight:700;line-height:1}.progress-bar-large{background:#fff3;border-radius:10px;width:100%;height:8px;overflow:hidden}.progress-bar-large .progress-fill{background:#fff}.star-box{text-align:center;flex-shrink:0}.star-box i{color:gold;margin-bottom:6px;font-size:40px}.star-box .star-num{font-size:24px;font-weight:700}.game-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.game-card{text-align:center;cursor:pointer;padding:24px 16px}.game-card:hover{transform:translateY(-2px)}.game-icon{border-radius:14px;justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 12px;display:flex}.game-icon.pink{background:linear-gradient(135deg,#f472b6,#db2777)}.game-icon.blue{background:linear-gradient(135deg,#60a5fa,#2563eb)}.game-icon.orange{background:linear-gradient(135deg,#fb923c,#ea580c)}.game-icon i{color:#fff;font-size:28px}.game-card h4{color:var(--gray-800);margin-bottom:6px;font-size:16px;font-weight:600}.game-card p{color:var(--gray-500);margin-bottom:12px;font-size:13px;line-height:1.4}.game-star{color:var(--warning-600);justify-content:center;align-items:center;gap:4px;font-size:14px;font-weight:600;display:flex}.word-option{background:var(--primary-50);border:2px solid var(--primary-200);color:var(--primary-700);cursor:pointer;-webkit-user-select:none;user-select:none;border-radius:25px;padding:10px 18px;font-size:16px;font-weight:500;transition:all .25s}.word-option:hover{background:var(--primary-100);border-color:var(--primary-400);transform:scale(1.05)}.word-option.selected{opacity:.4;pointer-events:none;background:var(--gray-200);border-color:var(--gray-300);color:var(--gray-500)}.exam-card{text-align:center;padding:40px 20px}.exam-icon{background:var(--primary-50);border-radius:50%;justify-content:center;align-items:center;width:70px;height:70px;margin:0 auto 20px;display:flex}.exam-icon i{color:var(--primary-500);font-size:32px}.exam-card h3{color:var(--gray-800);margin-bottom:10px;font-size:24px;font-weight:700}.exam-card p{color:var(--gray-500);margin-bottom:32px;font-size:15px}.exam-info-grid{grid-template-columns:repeat(3,1fr);gap:16px;max-width:700px;margin:0 auto 32px;display:grid}.exam-info-item{background:var(--gray-50);border-radius:var(--card-radius);padding:20px 16px}.exam-info-item i{color:var(--primary-500);margin-bottom:10px;font-size:28px}.exam-info-item .exam-num{color:var(--gray-800);margin-bottom:6px;font-size:28px;font-weight:700}.exam-info-item p{color:var(--gray-500);margin:0;font-size:13px}.modal{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:9999;background:#00000080;justify-content:center;align-items:center;padding:16px;display:none;position:fixed;inset:0}.modal.active{display:flex}.modal-content{border-radius:var(--card-radius);width:100%;max-width:600px;max-height:90vh;box-shadow:var(--shadow-lg);-webkit-overflow-scrolling:touch;background:#fff;padding:24px 20px;overflow-y:auto}.modal-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.modal-title{color:var(--gray-800);font-size:20px;font-weight:700}.modal-close{cursor:pointer;color:var(--gray-500);background:0 0;border:none;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;padding:0;font-size:24px;transition:all .3s;display:flex}.modal-close:hover{background:var(--gray-100)}.form-group{margin-bottom:16px}.form-label{color:var(--gray-700);margin-bottom:6px;font-size:14px;font-weight:500;display:block}.form-input{border:1px solid var(--gray-300);border-radius:var(--btn-radius);-webkit-appearance:none;width:100%;min-height:44px;padding:12px 16px;font-family:inherit;font-size:15px;transition:all .3s}.form-input:focus{border-color:var(--primary-400);outline:none;box-shadow:0 0 0 3px #f973161a}.form-select{border:1px solid var(--gray-300);border-radius:var(--btn-radius);-webkit-appearance:none;background:#fff;width:100%;min-height:44px;padding:12px 16px;font-family:inherit;font-size:15px;transition:all .3s}.form-select:focus{border-color:var(--primary-400);outline:none;box-shadow:0 0 0 3px #f973161a}.form-error{color:var(--danger-600);margin-top:4px;font-size:12px;display:none}.notification{border-radius:var(--btn-radius);box-shadow:var(--shadow-lg);z-index:10000;border-left:4px solid var(--primary-500);background:#fff;max-width:calc(100vw - 32px);padding:14px 16px;transition:transform .3s;position:fixed;top:16px;right:16px;transform:translate(120%)}.notification.show{transform:translate(0)}.notification.success{border-left-color:var(--success-500)}.notification.error{border-left-color:var(--danger-500)}.notification.warning{border-left-color:var(--warning-500)}.notification-header{justify-content:space-between;align-items:start;margin-bottom:4px;display:flex}.notification-title{color:var(--gray-800);font-size:15px;font-weight:600}.notification-close{cursor:pointer;color:var(--gray-500);background:0 0;border:none;flex-shrink:0;margin-left:12px;font-size:18px;line-height:1}.notification-message{color:var(--gray-600);font-size:13px;line-height:1.5}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.result-card{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:var(--card-radius);margin-top:16px;padding:16px}.result-title{color:var(--gray-800);align-items:center;gap:6px;margin-bottom:12px;font-size:16px;font-weight:600;display:flex}.result-title i{color:var(--primary-500)}.result-content{color:var(--gray-700);font-size:14px;line-height:1.8}.result-section{margin-bottom:16px}.result-section h4{color:var(--gray-800);margin-bottom:10px;font-size:15px;font-weight:600}.result-list{padding-left:20px}.result-list li{margin-bottom:6px;font-size:14px}.grade-selector{flex-wrap:wrap;gap:10px;margin-bottom:20px;display:flex}.grade-btn{border:2px solid var(--gray-200);border-radius:var(--btn-radius);cursor:pointer;color:var(--gray-600);background:#fff;flex:1;min-width:80px;min-height:44px;padding:10px 16px;font-size:14px;font-weight:500;transition:all .3s}.grade-btn:hover{border-color:var(--primary-400);color:var(--primary-600)}.grade-btn.active{background:var(--primary-gradient);color:#fff;border-color:#0000}.question-card{margin-bottom:16px;padding:20px 16px}.question-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:12px;display:flex}.question-meta{flex-wrap:wrap;gap:8px;display:flex}.question-tag{background:var(--primary-50);color:var(--primary-600);border-radius:20px;padding:3px 8px;font-size:11px;font-weight:500}.question-year{background:var(--gray-100);color:var(--gray-600);border-radius:20px;padding:3px 8px;font-size:11px;font-weight:500}.question-text{color:var(--gray-800);margin-bottom:16px;font-size:15px;line-height:1.8}.question-text p{margin-bottom:10px}.question-options{flex-direction:column;gap:10px;margin-bottom:16px;display:flex}.option-item{border:2px solid var(--gray-200);border-radius:var(--btn-radius);cursor:pointer;min-height:44px;padding:12px 14px;font-size:14px;transition:all .3s}.option-item:hover{border-color:var(--primary-400);background:var(--primary-50)}.option-item.selected{border-color:var(--primary-500);background:var(--primary-50)}.option-item.correct{border-color:var(--success-500);background:var(--success-50)}.option-item.wrong{border-color:var(--danger-500);background:var(--danger-50)}.loading{border:2px solid var(--gray-300);border-top:2px solid var(--primary-500);border-radius:50%;width:18px;height:18px;animation:1s linear infinite spin;display:inline-block}.main-module-buttons{gap:12px;margin-bottom:16px;display:none}.main-module-btn{border-radius:var(--card-radius);cursor:pointer;border:1px solid var(--gray-200);box-shadow:var(--shadow-sm);background:#fff;flex-direction:column;flex:1;align-items:center;gap:8px;padding:16px;transition:all .3s;display:flex}.main-module-btn:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.main-module-btn:active{transform:scale(.98)}.main-module-icon{color:#fff;border-radius:14px;justify-content:center;align-items:center;width:48px;height:48px;font-size:22px;display:flex}.main-module-icon.essay-icon{background:linear-gradient(135deg,#f472b6,#db2777)}.main-module-icon.weakness-icon{background:linear-gradient(135deg,#60a5fa,#2563eb)}.main-module-text{color:var(--gray-700);font-size:14px;font-weight:600}.bottom-nav{border-top:1px solid var(--gray-200);z-index:100;height:64px;padding:0 16px;padding-bottom:env(safe-area-inset-bottom,0);background:#fff;justify-content:space-around;align-items:center;display:none;position:fixed;bottom:0;left:0;right:0}.bottom-nav-item{cursor:pointer;color:var(--gray-500);flex-direction:column;align-items:center;gap:4px;padding:8px 16px;transition:all .3s;display:flex}.bottom-nav-item i{font-size:20px}.bottom-nav-item span{font-size:11px;font-weight:500}.bottom-nav-item.active{color:var(--primary-600)}.bottom-nav-center{cursor:pointer;flex-direction:column;align-items:center;gap:4px;margin-top:-20px;display:flex}.bottom-nav-camera{background:var(--primary-gradient);border-radius:50%;justify-content:center;align-items:center;width:56px;height:56px;transition:all .3s;display:flex;box-shadow:0 4px 12px #f9731666}.bottom-nav-camera i{color:#fff;font-size:24px}.bottom-nav-center span{color:var(--gray-600);font-size:11px;font-weight:500}.bottom-nav-center:hover .bottom-nav-camera{transform:scale(1.05)}.more-menu-modal{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#00000080;justify-content:center;align-items:flex-end;display:none;position:fixed;inset:0}.more-menu-modal.active{display:flex}.more-menu-content{border-radius:var(--card-radius) var(--card-radius) 0 0;background:#fff;width:100%;max-width:500px;padding:20px;animation:.3s slideUp}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.more-menu-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.more-menu-header h3{color:var(--gray-800);font-size:18px;font-weight:600}.more-menu-close{color:var(--gray-500);cursor:pointer;background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;width:36px;height:36px;font-size:20px;transition:all .3s;display:flex}.more-menu-close:hover{background:var(--gray-100)}.more-menu-grid{grid-template-columns:repeat(4,1fr);gap:16px;display:grid}.more-menu-item{cursor:pointer;border-radius:12px;flex-direction:column;align-items:center;gap:8px;padding:12px 8px;transition:all .3s;display:flex}.more-menu-item:hover{background:var(--gray-50)}.more-menu-icon{color:#fff;border-radius:14px;justify-content:center;align-items:center;width:48px;height:48px;font-size:22px;display:flex}.more-menu-icon.reading-icon{background:linear-gradient(135deg,#22c55e,#16a34a)}.more-menu-icon.exam-icon{background:linear-gradient(135deg,#f59e0b,#d97706)}.more-menu-icon.game-icon-nav{background:linear-gradient(135deg,#8b5cf6,#7c3aed)}.more-menu-icon.config-icon{background:linear-gradient(135deg,#6b7280,#4b5563)}.more-menu-item span{color:var(--gray-700);font-size:12px;font-weight:500}@media (width<=992px){.stats-grid{grid-template-columns:repeat(2,1fr)}.two-col-grid,.practice-grid{grid-template-columns:1fr}.practice-type-grid,.game-grid,.exam-info-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){:root{--sidebar-width:280px;--header-height:60px}.sidebar{z-index:999;height:100vh;transition:transform .3s;position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.show{transform:translate(0)}.mobile-menu-btn{display:flex}.top-header{padding:0 12px}.header-welcome h3{font-size:16px}.grade-tag{padding:3px 8px;font-size:11px}.header-right{gap:8px}.stats-item,.user-avatar span{display:none}.icon-btn{width:36px;height:36px}.avatar-img{width:32px;height:32px;font-size:12px}.content-wrapper{padding:12px}.welcome-banner{text-align:center;flex-direction:column;padding:20px 16px}.banner-content h1{font-size:22px}.banner-tags{justify-content:center}.banner-score{margin-top:10px}.score-circle{width:70px;height:70px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:16px}.stats-card{padding:16px 12px}.stats-card-info .stats-num{font-size:20px}.stats-card-icon{width:36px;height:36px}.stats-card-icon i{font-size:18px}.two-col-grid{gap:16px;margin-bottom:16px}.practice-grid{gap:12px;margin-bottom:16px}.practice-card{padding:16px 12px}.tab-btn{padding:12px 18px;font-size:14px}.grade-btn{min-width:70px;padding:8px 12px;font-size:13px}.game-progress-banner{text-align:center;flex-direction:column;padding:20px 16px}.progress-num{font-size:32px}.game-grid{grid-template-columns:1fr;gap:12px}.game-card{padding:20px 16px}.exam-info-grid{grid-template-columns:1fr;gap:12px}.exam-card{padding:30px 16px}.modal{padding:12px}.modal-content{padding:20px 16px}.notification{max-width:none;left:12px;right:12px}.main-module-buttons,.bottom-nav{display:flex}.content-wrapper{padding-bottom:80px}.main-container{padding-bottom:64px}}@media (width<=480px){.stats-grid,.practice-type-grid{grid-template-columns:1fr}.banner-content h1,.page-header h2{font-size:20px}.page-header-top{flex-direction:column;align-items:flex-start}.header-tag-group{flex-direction:row;align-items:flex-start;gap:8px}.btn-group{flex-direction:column}.btn{width:100%}}