:root{--primary: #1890ff;--primary-light: #40a9ff;--primary-bg: #e6f7ff;--primary-dark: #096dd9;--success: #52c41a;--danger: #ff4d4f;--warning: #fa8c16;--text: #1a1a2e;--text-secondary: #666;--text-muted: #999;--border: #e8e8e8;--bg: #f0f2f5;--card-shadow: 0 2px 16px rgba(0,0,0,.06);--card-shadow-hover: 0 8px 24px rgba(0,0,0,.1);--radius: 12px;--radius-lg: 16px;--radius-sm: 8px;--transition: .25s cubic-bezier(.4, 0, .2, 1);--spring: .4s cubic-bezier(.34, 1.56, .64, 1)}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-size:16px}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,Helvetica Neue,sans-serif;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;overflow-x:hidden}#root{height:100%}input,textarea,button,select{font-family:inherit;font-size:inherit}input:focus,textarea:focus,button:focus,select:focus{outline:none}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{box-shadow:0 0 #1890ff59}50%{box-shadow:0 0 0 12px #1890ff00}}@keyframes scoreCount{0%{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}@keyframes gradientFlow{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}@keyframes checkBounce{0%{transform:scale(0)}60%{transform:scale(1.2)}to{transform:scale(1)}}.app-container{max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg);position:relative;display:flex;flex-direction:column}.page-content{flex:1;padding-top:56px;padding-bottom:70px;padding-bottom:calc(70px + env(safe-area-inset-bottom,0px));overflow-y:auto}.page-content.no-tab{padding-bottom:24px}.header-bar{position:fixed;top:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;height:56px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);background-size:200% 200%;animation:gradientFlow 6s ease infinite;color:#fff;display:flex;align-items:center;padding:0 16px;z-index:1000;box-shadow:0 4px 20px #1890ff59;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-bar .back-btn{display:flex;align-items:center;justify-content:center;width:38px;height:38px;border:none;background:#ffffff2e;border-radius:50%;color:#fff;font-size:18px;cursor:pointer;margin-right:12px;flex-shrink:0;min-width:38px;min-height:38px;transition:all var(--transition)}.header-bar .back-btn:active{background:#ffffff59;transform:scale(.9)}.header-bar .header-title{font-size:18px;font-weight:700;flex:1;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;letter-spacing:.5px}.header-bar .header-subtitle{font-size:11px;opacity:.85;text-align:center;margin-top:-2px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;height:60px;height:calc(60px + env(safe-area-inset-bottom,0px));padding-bottom:env(safe-area-inset-bottom,0px);background:#fffffff2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);display:flex;align-items:center;border-top:1px solid rgba(0,0,0,.06);z-index:1000;box-shadow:0 -4px 20px #0000000f}.bottom-nav .nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;height:60px;border:none;background:transparent;cursor:pointer;color:var(--text-muted);text-decoration:none;min-height:44px;padding:4px 0;transition:all var(--transition);position:relative}.bottom-nav .nav-item:after{content:"";position:absolute;top:0;left:50%;transform:translate(-50%);width:20px;height:3px;border-radius:2px;background:var(--primary);opacity:0;transition:all var(--transition)}.bottom-nav .nav-item.active:after{opacity:1;width:28px}.bottom-nav .nav-item .nav-icon{font-size:22px;margin-bottom:2px;transition:transform var(--transition)}.bottom-nav .nav-item.active .nav-icon{transform:translateY(-2px)}.bottom-nav .nav-item .nav-label{font-size:11px;font-weight:500}.bottom-nav .nav-item.active{color:var(--primary);font-weight:600}.card{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--card-shadow);margin:14px 16px;overflow:hidden;transition:box-shadow var(--transition)}.card:active{box-shadow:var(--card-shadow-hover)}.card-header{padding:16px;font-size:16px;font-weight:700;color:var(--text);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px}.card-body{padding:16px}.form-group{margin-bottom:18px}.form-label{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:8px;font-weight:600}.form-input{width:100%;height:46px;padding:0 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:15px;color:var(--text);background:#f8f9fb;transition:all var(--transition);min-height:44px}.form-input:hover{border-color:#b0c4de;background:#fff}.form-input:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px #1890ff1a}.form-select{width:100%;height:46px;padding:0 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:15px;color:var(--text);background:#f8f9fb;transition:all var(--transition);min-height:44px;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer}.form-select:hover{border-color:#b0c4de}.form-select:focus{border-color:var(--primary);box-shadow:0 0 0 3px #1890ff1a}.form-textarea{width:100%;min-height:100px;padding:12px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:15px;color:var(--text);background:#f8f9fb;resize:vertical;transition:all var(--transition)}.form-textarea:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px #1890ff1a}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:46px;min-height:46px;padding:0 22px;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer;transition:all var(--transition);min-width:46px;-webkit-user-select:none;user-select:none;position:relative;overflow:hidden}.btn:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle,rgba(255,255,255,.25) 10%,transparent 70%);opacity:0;transition:opacity .3s}.btn:active:after{opacity:1}.btn:active{transform:scale(.97)}.btn-primary{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;box-shadow:0 4px 16px #1890ff4d}.btn-primary:active{background:var(--primary-dark)}.btn-primary:disabled{background:#91d5ff;box-shadow:none;cursor:not-allowed}.btn-danger{background:linear-gradient(135deg,var(--danger) 0%,#d9363e 100%);color:#fff;box-shadow:0 4px 16px #ff4d4f4d}.btn-danger:active{background:#d9363e}.btn-block{width:100%}.btn-sm{height:34px;min-height:34px;padding:0 14px;font-size:13px;min-width:34px;border-radius:6px}.btn-text{background:none;border:none;color:var(--primary);cursor:pointer;padding:0;font-size:14px;font-weight:500;transition:color var(--transition)}.list-item{display:flex;align-items:center;padding:15px 16px;border-bottom:1px solid var(--border);cursor:pointer;min-height:44px;transition:all var(--transition);text-decoration:none;color:inherit;border-radius:var(--radius-sm);margin:2px 0}.list-item:last-child{border-bottom:none}.list-item:active{background:var(--primary-bg);transform:scale(.99)}.list-item .list-item-content{flex:1;min-width:0}.list-item .list-item-title{font-size:15px;color:var(--text);margin-bottom:4px;font-weight:500}.list-item .list-item-desc{font-size:12px;color:var(--text-muted)}.list-item .list-item-arrow{color:#ccc;font-size:14px;margin-left:8px;flex-shrink:0;transition:transform var(--transition)}.list-item:active .list-item-arrow{transform:translate(3px)}.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;letter-spacing:.3px}.tag-green{background:#f6ffed;color:var(--success);border:1px solid #b7eb8f}.tag-red{background:#fff2f0;color:var(--danger);border:1px solid #ffccc7}.tag-orange{background:#fff7e6;color:var(--warning);border:1px solid #ffd591}.tag-blue{background:var(--primary-bg);color:var(--primary);border:1px solid #91d5ff}.tag-gray{background:#fafafa;color:#8c8c8c;border:1px solid var(--border)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:2000;display:flex;align-items:center;justify-content:center;animation:fadeIn .2s ease}.modal-content{background:#fff;border-radius:var(--radius-lg);width:85%;max-width:360px;overflow:hidden;animation:scaleIn var(--spring);box-shadow:0 20px 60px #00000040}.modal-header{padding:20px 16px 12px;text-align:center;font-size:17px;font-weight:700;color:var(--text)}.modal-body{padding:0 16px 16px;text-align:center;font-size:15px;color:var(--text-secondary);line-height:1.6}.modal-footer{display:flex;border-top:1px solid var(--border)}.modal-footer .btn{flex:1;border-radius:0;height:50px;min-height:50px;font-size:16px}.modal-footer .btn-cancel{background:#fff;color:var(--text-secondary);border-right:1px solid var(--border)}.modal-footer .btn-confirm{background:#fff;color:var(--primary);font-weight:700}.quick-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding:18px 16px}.quick-action-card{background:#fff;border-radius:var(--radius);padding:18px 8px;text-align:center;cursor:pointer;box-shadow:var(--card-shadow);transition:all var(--transition);min-height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:none;text-decoration:none;color:inherit;position:relative;overflow:hidden}.quick-action-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--primary-light));opacity:0;transition:opacity var(--transition)}.quick-action-card:active{transform:scale(.95)}.quick-action-card:active:before{opacity:1}.quick-action-card .action-icon{font-size:30px;margin-bottom:8px;transition:transform var(--transition)}.quick-action-card:active .action-icon{transform:scale(1.15)}.quick-action-card .action-label{font-size:13px;color:var(--text);font-weight:500}.stats-row{display:flex;padding:14px 16px;gap:10px}.stat-item{flex:1;background:#fff;border-radius:var(--radius);padding:14px 10px;text-align:center;box-shadow:var(--card-shadow);transition:all var(--transition)}.stat-item:active{transform:translateY(-2px);box-shadow:var(--card-shadow-hover)}.stat-item .stat-num{font-size:24px;font-weight:800;color:var(--primary);line-height:1.1}.stat-item .stat-label{font-size:12px;color:var(--text-muted);margin-top:4px;font-weight:500}.login-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:24px;background:linear-gradient(135deg,#e6f0fa,#c3dafe,#e0e7ff 60%,#f0e6ff);background-size:300% 300%;animation:gradientFlow 12s ease infinite}.login-card{width:100%;max-width:360px;background:#ffffffeb;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:20px;padding:36px 28px;box-shadow:0 16px 48px #0000001f;animation:slideUp .6s var(--spring);border:1px solid rgba(255,255,255,.5)}.login-logo{text-align:center;margin-bottom:28px}.login-logo .logo-icon{font-size:52px;display:inline-block;animation:scaleIn .5s var(--spring)}.login-logo .logo-title{font-size:24px;font-weight:800;color:var(--primary-dark);margin-top:10px;letter-spacing:1px}.login-logo .logo-subtitle{font-size:13px;color:var(--text-muted);margin-top:4px;font-weight:500}.welcome-header{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);background-size:200% 200%;animation:gradientFlow 6s ease infinite;color:#fff;padding:28px 20px 24px;text-align:center}.welcome-header .welcome-text{font-size:16px;opacity:.9}.welcome-header .welcome-name{font-size:24px;font-weight:800;margin-top:6px;letter-spacing:1px}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state .empty-icon{font-size:52px;margin-bottom:14px}.empty-state .empty-text{font-size:15px}.loading-spinner{display:flex;align-items:center;justify-content:center;padding:60px 20px;color:var(--text-muted);font-size:14px}.loading-spinner:before{content:"";width:24px;height:24px;margin-right:10px;border:2.5px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.exam-question{padding:20px 16px;animation:fadeInUp .3s ease}.exam-question .question-num{font-size:14px;color:var(--primary);font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:8px}.exam-question .question-stem{font-size:16px;color:var(--text);line-height:1.8;margin-bottom:20px;font-weight:400}.exam-question .question-stem img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:10px 0;box-shadow:0 2px 10px #00000014}.question-material{background:var(--primary-bg);border:1px solid #bae7ff;border-radius:var(--radius);padding:14px 16px;margin-bottom:16px}.question-material .material-label{font-weight:700;color:var(--primary);font-size:14px;margin-bottom:8px}.question-material .material-text{font-size:14px;color:var(--text-secondary);line-height:1.8;white-space:pre-wrap}.question-material .material-text img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:8px 0;box-shadow:0 2px 10px #00000014}.exam-layout{display:flex;gap:16px;padding:16px}.exam-layout-left{width:42%;flex-shrink:0;position:sticky;top:0;align-self:flex-start;max-height:75vh;overflow-y:auto}.exam-layout-right{flex:1;min-width:0}.material-panel{background:var(--primary-bg);border:1px solid #bae7ff;border-radius:var(--radius);padding:14px 16px}.material-panel-label{font-weight:700;color:var(--primary);font-size:14px;margin-bottom:8px}.material-panel-text{font-size:13px;color:var(--text-secondary);line-height:1.8;white-space:pre-wrap}.material-panel-text img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:8px 0;box-shadow:0 2px 10px #00000014}.exam-options{display:flex;flex-direction:column;gap:12px}.exam-option{display:flex;align-items:center;padding:14px 16px;border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;min-height:48px;transition:all var(--transition);background:#fafbfc}.exam-option:hover{border-color:var(--primary-light);background:#f0f7ff}.exam-option.selected{border-color:var(--primary);background:var(--primary-bg);box-shadow:0 0 0 4px #1890ff14}.exam-option.selected-correct{border-color:var(--success);background:#f6ffed}.exam-option.selected-wrong{border-color:var(--danger);background:#fff2f0}.exam-option.correct{border-color:var(--success);background:#f6ffed}.exam-option .option-label{width:32px;height:32px;border-radius:50%;border:2px solid #d9d9d9;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;margin-right:12px;flex-shrink:0;color:var(--text-secondary);transition:all var(--transition)}.exam-option.selected .option-label{background:var(--primary);border-color:var(--primary);color:#fff}.exam-option.selected-correct .option-label{background:var(--success);border-color:var(--success);color:#fff}.exam-option.selected-wrong .option-label{background:var(--danger);border-color:var(--danger);color:#fff}.exam-option .option-text{font-size:15px;color:var(--text);flex:1;line-height:1.5}.question-nav{display:flex;flex-wrap:wrap;gap:10px;padding:14px 0;justify-content:center}.question-nav-item{width:38px;height:38px;min-width:38px;min-height:38px;border-radius:50%;border:2px solid var(--border);background:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;cursor:pointer;color:var(--text-secondary);font-weight:600;transition:all var(--transition)}.question-nav-item.active{background:var(--primary);border-color:var(--primary);color:#fff;box-shadow:0 4px 14px #1890ff59;transform:scale(1.1)}.question-nav-item.answered{background:var(--primary-bg);border-color:var(--primary-light);color:var(--primary)}.exam-nav-buttons{display:flex;gap:14px;padding:14px 16px}.exam-nav-buttons .btn{flex:1}.result-score{text-align:center;padding:36px 16px 24px;background:linear-gradient(180deg,#fff,#f8fbff)}.result-score .score-number{font-size:64px;font-weight:900;line-height:1;animation:scoreCount .6s var(--spring)}.result-score .score-label{font-size:15px;color:var(--text-secondary);margin-top:8px;font-weight:600}.result-score .score-detail{font-size:13px;color:var(--text-muted);margin-top:10px}.result-question{padding:18px 0;border-bottom:1px solid var(--border)}.result-question:last-child{border-bottom:none}.result-question .result-stem{font-size:15px;color:var(--text);line-height:1.8;margin-bottom:10px}.result-question .result-stem img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:8px 0}.result-question .result-answer-info{display:flex;gap:16px;font-size:13px;margin-bottom:8px}.result-question .result-analysis{background:#f8f9fb;padding:12px 14px;border-radius:var(--radius-sm);font-size:13px;color:var(--text-secondary);line-height:1.7;margin-top:10px;border-left:3px solid var(--primary)}.wrong-group{margin:14px 0}.wrong-group .wrong-group-header{display:flex;justify-content:space-between;align-items:center;padding:16px 18px;background:#f8f9fb;border-radius:var(--radius) var(--radius) 0 0;cursor:pointer;min-height:48px;font-weight:600;font-size:15px;transition:background var(--transition)}.wrong-group .wrong-group-header:active{background:#edf0f4}.wrong-group .wrong-group-body{background:#fff;border-radius:0 0 var(--radius) var(--radius);overflow:hidden}.profile-section{padding:18px 0}.profile-section .section-title{font-size:13px;color:var(--text-muted);padding:0 16px 10px;font-weight:700;text-transform:uppercase;letter-spacing:1px}.message-toast{position:fixed;top:72px;left:50%;transform:translate(-50%);z-index:3000;padding:12px 24px;border-radius:24px;font-size:14px;color:#fff;animation:slideDown .3s ease;max-width:340px;text-align:center;font-weight:600;box-shadow:0 8px 24px #0003}.message-toast.success{background:linear-gradient(135deg,var(--success),#389e0d)}.message-toast.error{background:linear-gradient(135deg,var(--danger),#d9363e)}@media (min-width: 480px){.app-container{border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 0 0 1px var(--border),0 8px 40px #00000014;margin-top:20px;margin-bottom:20px}.header-bar,.bottom-nav{border-radius:0}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#d4d9e0;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#b0b8c4}