:root{--primary: #007AFF;--primary-light: #E6F3FF;--primary-dark: #0056CC;--text-primary: #000000;--text-secondary: #666666;--text-tertiary: #999999;--background: #FFFFFF;--background-secondary: #F8F9FA;--border: #E5E5E7;--success: #34C759;--error: #FF3B30;--warning: #FF9500;--shadow: 0 2px 8px rgba(0, 0, 0, .08);--shadow-hover: 0 4px 16px rgba(0, 0, 0, .12);--radius: 8px;--radius-lg: 12px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--spacing-3xl: 64px;--google-color: #DB4437;--tooltip-bg: rgba(0, 0, 0, .8)}*{margin:0;padding:0;box-sizing:border-box;-webkit-font-smoothing:antialiased}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:var(--text-primary);background:linear-gradient(var(--background),var(--background-secondary));line-height:1.6;font-size:16px;padding-top:0;padding-right:env(safe-area-inset-right);padding-bottom:env(safe-area-inset-bottom);padding-left:env(safe-area-inset-left)}.text-h1{font-size:36px;font-weight:700;line-height:1.2;margin-bottom:var(--spacing-xl)}.text-h2{font-size:28px;font-weight:600;line-height:1.3;margin-bottom:var(--spacing-lg)}.text-h3{font-size:22px;font-weight:600;line-height:1.4;margin-bottom:var(--spacing-md)}.text-lg{font-size:18px;font-weight:500;line-height:1.5}.text-base{font-size:16px;font-weight:400;line-height:1.6}.text-sm{font-size:14px;font-weight:400;line-height:1.5}.text-xs{font-size:12px;font-weight:400;line-height:1.4}.container{max-width:900px;margin:0 auto;padding:0 var(--spacing-xl)}.top-toolbar{display:flex;justify-content:space-between;align-items:center;padding:calc(var(--spacing-lg) + env(safe-area-inset-top)) var(--spacing-xl) var(--spacing-lg);background:var(--background);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.toolbar-inner{width:100%;max-width:900px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.toolbar-left{display:flex;align-items:center;gap:var(--spacing-md);min-width:0}.app-logo{font-size:20px;font-weight:700;color:var(--primary);text-decoration:none;white-space:nowrap}.lang-toggle{display:flex;align-items:center}.lang-toggle-option{padding:var(--spacing-sm);cursor:pointer;color:var(--text-secondary);transition:color .2s ease;font-size:13px;font-weight:500}.lang-toggle-option+.lang-toggle-option:before{content:"/";color:var(--border);margin-right:var(--spacing-sm);font-weight:400;pointer-events:none}.lang-toggle-option.active{color:var(--primary);font-weight:600}.lang-toggle-option:hover:not(.active){color:var(--text-primary)}.lang-switch{background:none;border:none;cursor:pointer;padding:4px 6px;border-radius:var(--radius);font-size:13px;font-weight:500;color:var(--text-secondary);transition:color .2s ease,background .2s ease}.lang-switch:hover{color:var(--primary);background:var(--background-secondary)}.question-mode-toggle{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.mode-toggle-label{font-size:14px;color:var(--text-secondary);white-space:nowrap}.mode-toggle{display:flex;gap:var(--spacing-xs);align-items:center}.mode-toggle-option{padding:var(--spacing-xs) var(--spacing-sm);cursor:pointer;color:var(--text-secondary);transition:all .2s ease;font-size:12px;white-space:nowrap;text-align:center;background:var(--background-secondary);border-radius:var(--radius);border:1px solid var(--border)}.mode-toggle-option.active{background:var(--primary)!important;color:#fff!important;border-color:var(--primary)!important;box-shadow:0 2px 6px #007bff4d!important;font-weight:500!important;transform:translateY(-1px)!important}.mode-toggle-option:hover:not(.active){background:var(--background);color:var(--text-primary);border-color:var(--primary)}.nav-swipe-hint{display:none;color:var(--primary);font-size:12px;opacity:.8;pointer-events:none;white-space:nowrap;padding:var(--spacing-sm) var(--spacing-md);animation:navSwipeHint 3s ease-in-out infinite;position:absolute;left:0;top:0;background:#ffffffe6;border-radius:var(--radius);margin:var(--spacing-xs);box-shadow:var(--shadow-sm);z-index:2}@keyframes navSwipeHint{0%,to{opacity:.8;transform:translate(0)}50%{opacity:1;transform:translate(3px)}}.header{text-align:center;padding:var(--spacing-3xl) 0 var(--spacing-2xl) 0;margin-bottom:var(--spacing-2xl)}.header-title{margin-bottom:var(--spacing-lg);font-size:42px;font-weight:700;letter-spacing:-.5px;color:var(--text-primary)}.header-subtitle{color:var(--text-secondary);font-size:18px;font-weight:400}.auth-card{background:var(--background);border-radius:var(--radius-lg);box-shadow:0 4px 16px #00000014;max-width:420px;margin:0 auto var(--spacing-2xl);padding:var(--spacing-2xl);border:1px solid var(--border)}.auth-title{text-align:center;margin-bottom:var(--spacing-xl)}.auth-tabs{display:flex;border-bottom:1px solid var(--border);margin-bottom:var(--spacing-lg)}.auth-tab{flex:1;text-align:center;padding:var(--spacing-md) var(--spacing-sm);cursor:pointer;position:relative;color:var(--text-secondary);transition:all .2s ease}.auth-tab.active{color:var(--primary);font-weight:500}.auth-tab.active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background-color:var(--primary)}.auth-content{display:none}.auth-content.active{display:block}.form-group{margin-bottom:var(--spacing-md)}.form-label{display:block;margin-bottom:var(--spacing-xs);color:var(--text-primary);font-size:14px}.form-input{width:100%;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius);border:1px solid var(--border);background:var(--background);font-size:15px;transition:all .2s ease}.form-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.social-login{margin:var(--spacing-md) 0}.social-login-title{text-align:center;position:relative;margin-bottom:var(--spacing-md)}.social-login-title:before,.social-login-title:after{content:"";position:absolute;top:50%;width:35%;height:1px;background-color:var(--border)}.social-login-title:before{left:0}.social-login-title:after{right:0}.social-buttons{display:flex;justify-content:center;gap:var(--spacing-md)}.social-button{display:flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:var(--radius);border:1px solid var(--border);background:var(--background);cursor:pointer;transition:all .2s ease}.social-button:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.social-button.google{color:var(--google-color)}.social-icon{font-size:24px}.social-button.google .social-icon{background:linear-gradient(90deg,#4285f4,#34a853,#fbbc05 66%,#ea4335);-webkit-background-clip:text;color:transparent;font-weight:700}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;font-size:16px;font-weight:500;padding:var(--spacing-lg) var(--spacing-xl);border-radius:var(--radius-lg);border:none;cursor:pointer;transition:all .2s ease;text-decoration:none;box-shadow:0 3px 12px #007bff40;min-height:48px}.btn:hover{background:var(--primary-dark);box-shadow:0 4px 16px #007bff59;transform:translateY(-2px)}.btn:active{transform:translateY(0);box-shadow:0 2px 8px #007bff33}.btn-secondary{background:var(--background);color:var(--text-primary);border:1px solid var(--border);box-shadow:0 2px 8px #0000000f}.btn-secondary:hover{background:var(--background-secondary);box-shadow:0 3px 12px #0000001a;transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--primary);border:1px solid var(--primary);box-shadow:none}.btn-ghost:hover{background:var(--primary-light);box-shadow:0 2px 8px #007bff26;transform:translateY(-1px)}.btn-sm{font-size:14px;padding:var(--spacing-md) var(--spacing-lg);min-height:40px}.btn-block{width:100%}.auth-actions{display:flex;flex-direction:column;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.auth-actions .btn-block{width:100%}@media (min-width: 480px){.auth-actions{flex-direction:row}.auth-actions .btn-block{width:auto;flex:1}}.auth-footer{text-align:center;margin-top:var(--spacing-lg);color:var(--text-tertiary)}.auth-footer a{color:var(--primary);text-decoration:none}.auth-footer a:hover{text-decoration:underline}.auth-demo{text-align:center;color:var(--text-tertiary);margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px dashed var(--border)}.main-content{display:none}.main-content.active{display:block}.user-bar{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-xl) var(--spacing-2xl);background:var(--background);border-radius:var(--radius-lg);margin-bottom:var(--spacing-2xl);box-shadow:0 2px 12px #0000000f;border:1px solid var(--border)}.user-info{display:flex;align-items:center;gap:var(--spacing-md)}.user-avatar{width:40px;height:40px;border-radius:50%;background:var(--primary);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:16px}.user-details{display:flex;flex-direction:column}.user-greeting{color:var(--text-primary);font-weight:600;font-size:16px}.user-name{color:var(--text-secondary);font-size:12px;margin-top:2px;opacity:.8}.nav-menu{display:flex;justify-content:flex-start;margin-bottom:var(--spacing-lg);overflow-x:auto;-webkit-overflow-scrolling:touch;padding:var(--spacing-sm) 0;gap:var(--spacing-md);position:relative;padding-left:var(--spacing-md);padding-right:var(--spacing-xl);background:var(--background);border-radius:var(--radius-lg);box-shadow:0 2px 6px #0000000d;scrollbar-width:none}.nav-menu::-webkit-scrollbar{display:none}@media (min-width: 769px){.nav-menu{margin-bottom:var(--spacing-2xl)}}@media (max-width: 768px){.nav-item.active:after{display:none}.nav-item.active{background:var(--primary);color:#fff;border-radius:var(--radius)}}.nav-menu:before,.nav-menu:after{content:"";position:absolute;top:0;bottom:0;width:20px;pointer-events:none;z-index:1;display:none}.nav-menu.scrollable:before,.nav-menu.scrollable:after{display:block}.nav-menu:before{left:0;background:linear-gradient(90deg,var(--background),transparent)}.nav-menu:after{right:0;background:linear-gradient(90deg,transparent,var(--background))}@keyframes scrollHint{0%,to{opacity:.6;transform:translate(-50%) scale(1)}50%{opacity:1;transform:translate(-50%) scale(1.1)}}.nav-indicator{position:absolute;bottom:0;height:2px;background:var(--primary);border-radius:1px;transition:all .3s ease;width:0;left:0}.nav-item{padding:var(--spacing-md) var(--spacing-lg);color:var(--text-secondary);cursor:pointer;white-space:nowrap;border-radius:var(--radius);transition:all .2s ease;position:relative;display:flex;align-items:center;gap:var(--spacing-sm);font-size:14px;font-weight:500;min-height:44px}.nav-item:before{content:"";width:18px;height:18px;border-radius:3px;background-size:contain;background-repeat:no-repeat;background-position:center;opacity:.7;transition:opacity .2s ease}.nav-item[data-zh=题库练习]:before{content:"□";font-size:16px;line-height:1}.nav-item[data-zh=模拟考试]:before{content:"○";font-size:16px;line-height:1}.nav-item[data-zh=错题本]:before{content:"✕";font-size:16px;line-height:1}.nav-item[data-zh=知识讲解]:before{content:"◇";font-size:16px;line-height:1}.nav-item[data-zh=搜题]:before{content:"◯";font-size:16px;line-height:1}.nav-item[data-zh=收藏]:before{content:"☆";font-size:16px;line-height:1}.nav-item[data-zh=考试历史]:before{content:"△";font-size:16px;line-height:1}.nav-item[data-zh=统计]:before{content:"◢";font-size:16px;line-height:1}.nav-item[data-zh=反馈]:before{content:"◊";font-size:16px;line-height:1}.nav-item[data-zh=我的]:before{content:"≡";font-size:16px;line-height:1}.bottom-nav{display:none;position:fixed;left:0;right:0;bottom:0;background:var(--background);border-top:1px solid var(--border);box-shadow:0 -2px 8px #0000000d;z-index:800;padding:6px 0 calc(6px + env(safe-area-inset-bottom))}.bottom-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:4px 0;color:var(--text-secondary);font-size:11px;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:opacity .1s ease,color .1s ease}.bottom-nav-item:active{opacity:.5}.bottom-nav-item .bn-icon{font-size:18px;line-height:1}.bottom-nav-item.active{color:var(--primary);font-weight:600}@media (max-width: 768px){.nav-menu{display:none}.bottom-nav{display:flex}.main-content{padding-bottom:calc(64px + env(safe-area-inset-bottom))}}.nav-item:hover{background:var(--background-secondary);transform:translateY(-1px)}.nav-item:hover:before{opacity:1}.nav-item.active{color:var(--primary);background:var(--primary-light);font-weight:600;box-shadow:0 2px 8px #007bff33;position:relative}.nav-item.active:after{display:none}.nav-item.active:before{opacity:1}.content-panel{display:none}.content-panel.active{display:block}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.section-title{text-align:center;margin-bottom:var(--spacing-2xl);padding-bottom:var(--spacing-lg);position:relative}.section-title:after{content:"";position:absolute;bottom:var(--spacing-md);left:50%;transform:translate(-50%);width:80px;height:4px;background:var(--primary);border-radius:2px}.content-section{margin-bottom:var(--spacing-3xl);padding:var(--spacing-2xl);background:var(--background);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:0 2px 12px #0000000a}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-2xl)}.exam-layout{display:flex;gap:var(--spacing-2xl);align-items:flex-start}.exam-layout .feature-grid,.exam-history{flex:1}@media (max-width: 768px){.exam-layout{flex-direction:column}}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-xl);margin-bottom:var(--spacing-2xl)}@media (max-width: 768px){.topic-grid{grid-template-columns:1fr;gap:var(--spacing-md)}}.error-topics{margin-bottom:var(--spacing-xl)}.error-topics h3{margin-bottom:var(--spacing-lg)}.sub-section-title{margin:var(--spacing-2xl) 0 var(--spacing-xl);color:var(--text-primary);font-weight:600}.feature-item{background:var(--background);border-radius:var(--radius-lg);padding:var(--spacing-lg);text-align:center;cursor:pointer;transition:all .2s ease;border:1px solid var(--border);display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:108px;box-shadow:0 2px 12px #0000000f}.feature-item:hover{transform:translateY(-4px);box-shadow:0 6px 24px #007bff1f;border-color:var(--primary)}.feature-icon{font-size:26px;margin-bottom:var(--spacing-sm);color:var(--primary);font-weight:300}.bank-selector{display:flex;flex-wrap:wrap;justify-content:center;gap:var(--spacing-sm);margin:0 0 var(--spacing-lg);padding-bottom:var(--spacing-lg);border-bottom:1px solid var(--border)}.bank-pill{padding:var(--spacing-sm) var(--spacing-lg);border-radius:999px;border:1px solid var(--border);background:var(--background);color:var(--text-primary);font-size:14px;cursor:pointer;transition:all .2s ease}.bank-pill:hover{border-color:var(--primary)}.bank-pill.active{background:var(--primary);border-color:var(--primary);color:#fff}.topic-card{background:var(--background);border-radius:var(--radius-lg);padding:var(--spacing-2xl);cursor:pointer;transition:all .2s ease;box-shadow:0 2px 12px #0000000f;display:flex;flex-direction:column;border:1px solid var(--border);min-height:200px}.topic-card:hover{transform:translateY(-4px);box-shadow:0 6px 24px #007bff1f;border-color:var(--primary)}.topic-icon{font-size:32px;margin-bottom:var(--spacing-md)}.topic-title{font-weight:600;margin-bottom:var(--spacing-md)}.topic-progress{margin-top:auto;padding-top:var(--spacing-md)}.progress-text{display:flex;justify-content:space-between;margin-bottom:var(--spacing-xs);font-size:14px;color:var(--text-secondary)}.progress-bar{height:6px;background:#0000001a;border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:3px}.overall-progress-card{background:var(--background);border-radius:var(--radius-lg);padding:var(--spacing-2xl);margin-bottom:var(--spacing-xl);color:var(--text-primary);box-shadow:0 3px 16px #00000014;border:1px solid var(--border)}.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);position:relative}.progress-title{font-size:20px;font-weight:600;margin:0;color:var(--text-primary)}.progress-percentage{font-size:32px;font-weight:700;color:var(--primary)}.progress-bar-container{margin-bottom:var(--spacing-xl)}.progress-bar-bg{height:12px;background:#0000000f;border-radius:6px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--primary);border-radius:6px;transition:width .4s ease}.progress-stats{display:flex;justify-content:space-around;align-items:center}@media (max-width: 768px){.progress-stats{flex-wrap:wrap;gap:var(--spacing-md)}.overall-progress-card{padding:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.progress-header{flex-direction:column;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.progress-percentage{font-size:24px}}.stat-group{display:flex;flex-direction:column;align-items:center;text-align:center}.stat-number{font-size:20px;font-weight:600;line-height:1}.stat-text{font-size:14px;opacity:.9;margin-top:4px}.stat-divider{color:var(--text-secondary);font-size:18px}.history-item{background:var(--background);border-radius:var(--radius);padding:var(--spacing-lg);margin-bottom:var(--spacing-md);border:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.history-info{flex:1}.history-score{font-size:24px;font-weight:600;color:var(--primary)}.history-details{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-xs);font-size:14px;color:var(--text-secondary)}.history-errors{color:var(--error);cursor:pointer;text-decoration:underline}.history-errors:hover{color:var(--error-dark)}.feature-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--primary)}.feature-icon{width:24px;height:24px;margin-bottom:var(--spacing-md);color:var(--primary);font-size:24px}.feature-title{margin-bottom:var(--spacing-xs);font-weight:500}.feature-desc{color:var(--text-tertiary)}.question-page{position:fixed;top:0;left:0;right:0;bottom:0;background:var(--background);z-index:900;padding:var(--spacing-lg);padding-top:env(safe-area-inset-top);padding-right:calc(var(--spacing-lg) + env(safe-area-inset-right));padding-bottom:calc(var(--spacing-lg) + env(safe-area-inset-bottom));padding-left:calc(var(--spacing-lg) + env(safe-area-inset-left));display:flex;flex-direction:column;overflow-y:auto;overscroll-behavior-y:contain;transform:translateY(100%);transition:transform .3s ease;box-sizing:border-box}.question-numbers-container{margin:0 calc(-1 * var(--spacing-lg)) var(--spacing-md);padding:0 var(--spacing-lg);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;position:relative;display:block!important;background:var(--background-secondary)}.question-numbers-container::-webkit-scrollbar{display:none}.question-numbers{display:flex!important;flex-wrap:nowrap;gap:8px;padding:var(--spacing-sm) 0;justify-content:flex-start;width:auto}.question-number-item{min-width:36px;height:36px;display:flex!important;align-items:center;justify-content:center;border-radius:var(--radius);background:var(--background);font-size:14px;font-weight:500;cursor:pointer;flex-shrink:0;border:1px solid var(--border)}.question-number-item.current{border:2px solid var(--primary);font-weight:700}.question-number-item.correct{background:var(--success);color:#fff;border-color:var(--success)}.question-number-item.wrong{background:var(--error);color:#fff;border-color:var(--error)}.question-number-item.ellipsis{background:transparent;border:none;color:var(--text-secondary);font-weight:400}.question-page.active{transform:translateY(0)}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);padding-top:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--background);z-index:20}.question-back{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--text-secondary);cursor:pointer;background:transparent;border:none;padding:var(--spacing-sm);font-size:14px}.question-back>span:first-child{font-size:16px;line-height:1}.subpage-back{margin-bottom:var(--spacing-sm)}.question-progress{font-weight:500;color:var(--text-secondary)}.question-actions{display:flex;align-items:center;gap:var(--spacing-md)}.question-fav{display:flex;align-items:center;gap:4px;color:var(--text-secondary);cursor:pointer;background:transparent;border:none;padding:var(--spacing-sm);font-size:14px}.question-fav:hover,.question-fav.is-fav{color:var(--primary)}.question-remove:hover{color:#e5484d}.question-fav-icon{font-size:16px;line-height:1}#questionFavBtn.is-fav .question-fav-icon{color:var(--primary)}.question-content{flex:1;display:flex;flex-direction:column;margin-bottom:var(--spacing-xl)}.question-card{background:var(--background);border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-lg);box-shadow:var(--shadow);border:1px solid var(--border);animation:slideUp .15s ease}@keyframes slideUp{0%{transform:translateY(16px);opacity:0}to{transform:translateY(0);opacity:1}}.question-number{color:var(--text-secondary);margin-bottom:var(--spacing-md)}.question-text{margin-bottom:var(--spacing-xl);line-height:1.7}.answer-result{margin-top:var(--spacing-xl);padding:var(--spacing-lg);border-radius:var(--radius);border-left:4px solid;display:none;animation:slideDown .18s ease}.answer-result.correct{background:#34c7591a;border-left-color:var(--success)}.answer-result.wrong{background:#ff3b301a;border-left-color:var(--error)}.result-status{font-weight:600;margin-bottom:var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-sm)}.result-status.correct{color:var(--success)}.result-status.wrong{color:var(--error)}.result-explanation{color:var(--text-secondary);line-height:1.6}@keyframes slideDown{0%{transform:translateY(-10px);opacity:0;max-height:0}to{transform:translateY(0);opacity:1;max-height:200px}}.bilingual-text{margin-bottom:var(--spacing-xl)}.bilingual-text .primary{margin-bottom:var(--spacing-sm);line-height:1.7;font-weight:500}.bilingual-text .secondary{color:var(--text-secondary);line-height:1.7;font-size:.9em;font-style:italic}.clickable-word{position:relative;border-bottom:2px dashed var(--primary);cursor:pointer;display:inline-block;color:var(--primary)}.word-tooltip{position:absolute;bottom:100%;left:50%;transform:translate(-50%);background:var(--tooltip-bg);color:#fff;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius);font-size:14px;white-space:nowrap;pointer-events:none;opacity:0;transition:opacity .2s ease;z-index:10;margin-bottom:var(--spacing-xs)}.word-tooltip:after{content:"";position:absolute;top:100%;left:50%;transform:translate(-50%);border-width:5px;border-style:solid;border-color:var(--tooltip-bg) transparent transparent transparent}.clickable-word:hover .word-tooltip{opacity:1}.question-numbers-panel{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--background);border-radius:var(--radius-lg);box-shadow:0 10px 30px #0003;border:1px solid var(--border);max-width:400px;width:90%;max-height:500px;z-index:1000;display:none;flex-direction:column}.question-numbers-panel.active{display:flex}.panel-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-lg);border-bottom:1px solid var(--border);font-weight:600}.panel-close{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-secondary);padding:0;width:30px;height:30px;display:flex;align-items:center;justify-content:center}.panel-close:hover{color:var(--text-primary)}.panel-content{padding:var(--spacing-lg);flex:1;overflow-y:auto}.question-numbers-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.question-number-btn{position:relative;width:40px;height:40px;border:2px solid var(--border);background:var(--background);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;cursor:pointer;font-weight:600;transition:all .2s ease}.question-number-btn:hover{border-color:var(--primary);color:var(--primary)}.question-number-btn.current{background:var(--primary);color:#fff;border-color:var(--primary)}.question-number-btn.correct{background:var(--success-light);border-color:var(--success);color:var(--success)}.question-number-btn.wrong{background:#ffebee;border-color:#f44336;color:#f44336}.question-number-btn.favorite:after{content:"★";position:absolute;bottom:-2px;right:-2px;font-size:12px;color:gold}.panel-legend{display:flex;flex-direction:column;gap:var(--spacing-sm)}.legend-item{display:flex;align-items:center;gap:var(--spacing-sm);font-size:14px;color:var(--text-secondary)}.legend-dot{width:16px;height:16px;border-radius:4px;border:2px solid}.legend-dot.current{background:var(--primary);border-color:var(--primary)}.legend-dot.correct{background:var(--success-light);border-color:var(--success)}.legend-dot.wrong{background:#ffebee;border-color:#f44336}.legend-dot.unanswered{background:var(--background);border-color:var(--border)}.legend-dot.favorite{background:var(--background);border-color:gold;position:relative}.legend-dot.favorite:after{content:"★";position:absolute;bottom:-6px;right:-6px;font-size:12px;color:gold}.question-image{width:100%;max-width:400px;margin:0 auto var(--spacing-xl);display:block;border-radius:var(--radius)}.option-list{margin-bottom:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-md)}.option-item{display:flex;align-items:flex-start;padding:var(--spacing-md);border-radius:var(--radius);cursor:pointer;transition:all .2s ease;background:var(--background-secondary);border:1px solid transparent}.option-item:hover{background:#f0f0f5}.option-item.selected{background:var(--primary-light);border-color:var(--primary)}.option-item.correct{background:#34c7591a;border-color:var(--success)}.option-item.wrong{background:#ff3b301a;border-color:var(--error)}.option-input{margin-right:var(--spacing-md);margin-top:2px}.option-text{flex:1;line-height:1.5}.option-bilingual{display:flex;flex-direction:column;flex:1}.option-bilingual .primary{margin-bottom:var(--spacing-xs);font-weight:500}.option-bilingual .secondary{font-size:14px;color:var(--text-secondary);font-style:italic}.button-group{display:flex;justify-content:center;gap:var(--spacing-md);flex-wrap:wrap;margin-top:var(--spacing-xl)}.question-page .button-group{position:sticky;bottom:0;z-index:50;background:var(--background);padding:var(--spacing-md) 0;padding-bottom:calc(var(--spacing-md) + env(safe-area-inset-bottom))}.question-page.with-sticky-buttons{padding-bottom:0}.question-page.with-sticky-buttons .question-content{margin-bottom:0}.search-container{position:relative;margin-bottom:var(--spacing-xl)}.search-input{width:100%;padding:var(--spacing-md) var(--spacing-md) var(--spacing-md) 48px;border-radius:var(--radius);border:1px solid var(--border);background:var(--background-secondary);font-size:16px}.search-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.search-icon{position:absolute;left:var(--spacing-md);top:50%;transform:translateY(-50%);color:var(--text-tertiary);width:20px;height:20px}.empty-state{text-align:center;padding:var(--spacing-3xl) 0;color:var(--text-secondary)}.empty-icon{font-size:48px;margin-bottom:var(--spacing-md);color:var(--text-tertiary)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:var(--spacing-lg)}.stat-item{background:var(--background);border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;border:1px solid var(--border)}.stat-value{font-size:28px;font-weight:600;color:var(--primary);margin-bottom:var(--spacing-xs)}.stat-label{color:var(--text-secondary)}.exam-status{display:flex;align-items:center;gap:var(--spacing-md)}.exam-timer{background:var(--error);color:#fff;padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius);font-weight:600;box-shadow:var(--shadow)}.feedback-textarea{width:100%;height:120px;padding:var(--spacing-md);border-radius:var(--radius);border:1px solid var(--border);background:var(--background);margin-bottom:var(--spacing-lg);resize:vertical;font-family:inherit;font-size:16px}.feedback-textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.knowledge-content{padding:var(--spacing-lg)}.knowledge-content h3{color:var(--primary);margin-bottom:var(--spacing-md);font-size:18px;font-weight:600}.knowledge-content p{margin-bottom:var(--spacing-md);line-height:1.6;color:var(--text-primary)}.knowledge-content ul{margin-bottom:var(--spacing-md);padding-left:var(--spacing-lg)}.knowledge-content li{margin-bottom:var(--spacing-xs);line-height:1.5}.dialog{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000;opacity:0;visibility:hidden}.dialog.active{opacity:1;visibility:visible}.dialog-content{background:var(--background);border-radius:var(--radius-lg);padding:var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);max-width:85%;width:320px;box-shadow:0 10px 25px #00000026;border:none}.dialog-buttons{display:flex;justify-content:space-around;margin-top:var(--spacing-xl);border-top:1px solid var(--border);padding-top:var(--spacing-lg)}.dialog-button{background:none;border:none;padding:var(--spacing-md) var(--spacing-lg);font-size:16px;font-weight:500;cursor:pointer;border-radius:var(--radius-lg);transition:background .2s;flex:1;text-align:center;white-space:nowrap}.dialog-button.primary{color:var(--primary)}.dialog-button.secondary{color:var(--text-secondary)}.dialog-button:hover{background:var(--background-secondary)}.dialog-title{margin-bottom:var(--spacing-md);text-align:center;font-size:18px;font-weight:600}.dialog-message{margin-bottom:var(--spacing-md);text-align:center;color:var(--text-secondary);line-height:1.6;font-size:16px}@media (max-width: 768px){body{-webkit-tap-highlight-color:transparent}.container{padding:0}.header{padding:var(--spacing-2xl) var(--spacing-lg)}.header-title{font-size:28px}.feature-grid{grid-template-columns:1fr 1fr;gap:var(--spacing-md);padding:0 var(--spacing-md)}.topic-grid{grid-template-columns:1fr;gap:var(--spacing-lg);padding:0 var(--spacing-md)}.overall-progress-card{padding:var(--spacing-lg);margin:0 var(--spacing-md) var(--spacing-lg);border-radius:var(--radius)}.content-section{padding:var(--spacing-lg);border-radius:0;border-left:none;border-right:none}.user-bar{padding:var(--spacing-lg);margin:var(--spacing-md);border-radius:var(--radius)}.auth-card{padding:var(--spacing-lg);margin:var(--spacing-md);border-radius:var(--radius);max-width:none}.dialog-content{width:280px;border-radius:var(--radius)}.question-page{border-radius:0}.progress-stats{flex-wrap:wrap;gap:var(--spacing-sm)}.stat-group{flex:1;min-width:60px}.stat-divider{display:none}.button-group{flex-direction:column}.button-group .btn{width:100%}.stats-grid{grid-template-columns:repeat(2,1fr);gap:var(--spacing-md)}.nav-menu{justify-content:flex-start;padding-left:var(--spacing-md);padding-right:var(--spacing-md);background:var(--background);border-radius:var(--radius-lg);box-shadow:0 2px 6px #0000000d}.auth-card{margin:var(--spacing-lg) auto;padding:var(--spacing-lg)}}.backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;z-index:900;opacity:0;visibility:hidden}.backdrop.active{opacity:1;visibility:visible}.loading-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0000004d;z-index:1200;display:flex;justify-content:center;align-items:center;opacity:0;visibility:hidden;transition:opacity .2s ease}.loading-overlay.active{opacity:1;visibility:visible}.loading-spinner{width:40px;height:40px;border:4px solid #fff;border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.pdf-canvas-container{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:var(--spacing-md)}.pdf-page-canvas{width:100%;margin-bottom:var(--spacing-md);box-shadow:var(--shadow);border:1px solid var(--border)}.site-footer{text-align:center;padding:var(--spacing-xl) 0 var(--spacing-lg);font-size:13px;color:var(--text-secondary)}body.logged-in .site-footer{display:none}.site-footer a{color:var(--text-secondary);text-decoration:none}.site-footer a:hover{color:var(--primary)}.site-footer-sep{margin:0 var(--spacing-sm)}.toolbar-right{display:flex;align-items:center;gap:var(--spacing-md)}.toolbar-user{display:none;position:relative;align-items:center}body.logged-in .toolbar-user{display:flex}.user-chip{display:flex;align-items:center;gap:var(--spacing-sm);background:none;border:none;cursor:pointer;padding:4px 6px;border-radius:var(--radius);transition:background .2s ease}.user-chip:hover{background:var(--background-secondary)}.user-chip-caret{font-size:10px;color:var(--text-secondary)}.user-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:180px;background:var(--background);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 8px 24px #0000001f;padding:6px;display:none;z-index:200}.user-menu.open{display:block}.user-menu-item{display:block;width:100%;text-align:left;background:none;border:none;padding:10px 12px;border-radius:var(--radius);font-size:14px;color:var(--text-primary);cursor:pointer;transition:background .2s ease}.user-menu-item:hover{background:var(--background-secondary)}.user-menu-item.danger{color:#e5484d}.user-menu-divider{height:1px;background:var(--border);margin:6px 4px}.toolbar-avatar{width:22px;height:22px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;flex-shrink:0}.toolbar-username{font-size:13px;color:var(--text-primary);max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.toolbar-link{border:none;background:none;padding:var(--spacing-sm);font-size:13px;color:var(--text-secondary);cursor:pointer;transition:color .2s ease}.toolbar-link:hover{color:var(--primary)}@media (max-width: 480px){.toolbar-username{display:none}}body.logged-in .header{display:none}.page-head{margin-bottom:var(--spacing-xl)}.page-head-title{font-size:26px;font-weight:700;margin-bottom:var(--spacing-xs)}.page-head-sub{color:var(--text-secondary);font-size:14px}#errors{padding-left:16px;padding-right:16px}.error-summary{background:var(--background);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 3px 16px #00000014;padding:var(--spacing-xl);margin-bottom:var(--spacing-xl)}.error-summary-top{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-lg);margin-bottom:var(--spacing-md)}.error-summary .btn{box-shadow:none;min-height:44px;padding:10px 20px;font-size:15px;gap:6px}.error-summary-label{color:var(--primary);font-size:13px;font-weight:500;margin-bottom:2px}.error-summary-count{font-size:15px;color:var(--text-secondary)}.error-summary-count strong{font-size:34px;font-weight:700;color:var(--text-primary);margin-right:4px}.error-summary-meta{font-size:13px;color:var(--text-secondary);margin-top:4px}.error-ring{flex-shrink:0}.error-summary .btn{box-shadow:none}.section-row{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:var(--spacing-md)}.section-meta{font-size:13px;color:var(--text-secondary)}.link-danger{background:none;border:none;cursor:pointer;font-size:13px;color:#e5484d;padding:0}.link-danger:hover{text-decoration:underline}#errorByTopicSection{margin-bottom:var(--spacing-xl)}#errorTopicGrid{display:flex;flex-direction:column;gap:var(--spacing-sm)}.topic-row{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);background:var(--background);border:1px solid var(--border);border-radius:var(--radius-lg);cursor:pointer;transition:border-color .2s ease,background .2s ease}.topic-row:hover{border-color:var(--primary);background:var(--background-secondary)}.topic-row-icon{flex-shrink:0;width:36px;height:36px;border-radius:var(--radius);background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:18px}.topic-row-name{flex:1;min-width:0;font-size:15px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-count{flex-shrink:0;min-width:26px;height:24px;padding:0 8px;border-radius:999px;background:var(--primary-light);color:var(--primary);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center}.topic-row-chevron{flex-shrink:0;color:var(--text-tertiary);font-size:20px;line-height:1}.mistake-card{background:var(--background);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-md)}.mistake-meta{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.mistake-tag{font-size:12px;font-weight:500;color:var(--primary);background:var(--primary-light);padding:2px 10px;border-radius:999px}.mistake-id{font-size:12px;color:var(--text-tertiary)}.mistake-q{font-size:15px;line-height:1.6;margin-bottom:var(--spacing-md)}.mistake-actions{display:flex;gap:var(--spacing-sm)}.mistake-actions .btn{box-shadow:none;min-height:36px;padding:7px 16px;font-size:13px;border-radius:var(--radius)}.settings-row{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-lg);padding:var(--spacing-lg);background:var(--background);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 2px 12px #0000000f}.settings-row .settings-label{font-size:15px;font-weight:500;color:var(--text-primary)}.settings-row .settings-hint{font-size:13px;color:var(--text-secondary);margin-top:2px}.btn-danger{background:var(--background);color:#e5484d;border:1px solid #e5484d;box-shadow:none;flex-shrink:0}.btn-danger:hover{background:#e5484d;color:#fff}.narrow-form{max-width:560px;margin:0 auto}.hdrop{position:relative;display:flex;align-items:center}.hdrop-trigger{display:flex;align-items:center;gap:4px;background:none;border:none;cursor:pointer;padding:4px 6px;border-radius:var(--radius);font-size:13px;font-weight:500;color:var(--text-secondary);max-width:160px;transition:color .2s ease,background .2s ease}.hdrop-trigger:hover{color:var(--primary);background:var(--background-secondary)}.hdrop-trigger>span:first-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.hdrop-caret{font-size:10px;color:var(--text-secondary);flex-shrink:0}.hdrop-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:180px;background:var(--background);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 8px 24px #0000001f;padding:6px;display:none;z-index:200}.hdrop-menu-right{left:auto;right:0}.hdrop-menu.open{display:block}.hdrop-item{display:block;width:100%;text-align:left;background:none;border:none;padding:10px 12px;border-radius:var(--radius);font-size:14px;color:var(--text-primary);cursor:pointer;transition:background .2s ease}.hdrop-item:hover{background:var(--background-secondary)}.hdrop-item.active{color:var(--primary);font-weight:600}@media (max-width: 480px){.app-logo{font-size:16px}.app-logo .brand-name{display:none}.hdrop-trigger{max-width:96px}#bankSwitchTrigger{max-width:132px}}.error-controls{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.seg{display:inline-flex;background:var(--background-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:2px}.seg-btn{border:none;background:none;cursor:pointer;padding:6px 14px;border-radius:6px;font-size:13px;color:var(--text-secondary);transition:all .2s ease}.seg-btn.active{background:var(--background);color:var(--primary);font-weight:600;box-shadow:0 1px 3px #00000014}.switch-row{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--text-secondary);cursor:pointer}.switch-row input{width:16px;height:16px;accent-color:var(--primary);cursor:pointer}.mistake-badge{font-size:12px;font-weight:500;color:#16794c;background:#e1f5ee;padding:2px 8px;border-radius:999px}.mistake-card.mastered{opacity:.7}#bankSwitchMenu{min-width:220px}.bank-item{display:flex;flex-direction:column;align-items:stretch;gap:2px}.bank-item-top{display:flex;align-items:center;gap:var(--spacing-sm)}.bank-item-name{font-size:14px;color:var(--text-primary)}.bank-item.active .bank-item-name{color:var(--primary);font-weight:600}.bank-item-cat{font-size:12px;color:var(--text-tertiary)}.bank-item.soon{opacity:.7}.bank-item-soon{margin-left:auto;flex-shrink:0;font-size:11px;color:var(--text-secondary);background:var(--background-secondary);border:1px solid var(--border);padding:1px 8px;border-radius:999px}.seo-intro{max-width:640px;margin:0 auto var(--spacing-2xl);padding:0 var(--spacing-md);text-align:center}body.logged-in .seo-intro{display:none}.seo-intro-title{font-size:20px;font-weight:600;margin-bottom:var(--spacing-md)}.seo-intro-text{color:var(--text-secondary);font-size:15px;line-height:1.7;margin-bottom:var(--spacing-lg)}.topic-card,.option-item,.topic-row,.hdrop-item,.hdrop-trigger,.user-menu-item,.feature-item,.seg-btn,.social-button,.question-back,.question-fav,.lang-switch,.bank-item,.user-chip{-webkit-tap-highlight-color:transparent}.topic-card:active,.option-item:active,.topic-row:active,.hdrop-item:active,.hdrop-trigger:active,.user-menu-item:active,.feature-item:active,.seg-btn:active,.social-button:active,.question-back:active,.question-fav:active,.lang-switch:active,.bank-item:active,.user-chip:active{opacity:.55}