/* ============ CSS架构优化 ============ */
        /* 1. 设计系统变量 */
        :root {
            /* 主题颜色 */
            --primary-color: #1e3c72;
            --primary-light: #2a5298;
            --primary-dark: #0d1b3e;
            
            --secondary-color: #FF6B35;
            --secondary-light: #FF9A3D;
            --secondary-dark: #E5531C;
            
            --success-color: #10B981;
            --success-light: #34D399;
            --success-dark: #059669;
            
            --warning-color: #F59E0B;
            --warning-light: #FBBF24;
            --warning-dark: #D97706;
            
            --danger-color: #EF4444;
            --danger-light: #F87171;
            --danger-dark: #DC2626;
            
            --info-color: #3B82F6;
            --info-light: #60A5FA;
            --info-dark: #2563EB;
            
            /* 中性色 */
            --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;
            
            /* 背景和文字 */
            --bg-primary: #FFFFFF;
            --bg-secondary: #F8FAFC;
            --bg-tertiary: #F1F5F9;
            
            --text-primary: #1F2937;
            --text-secondary: #4B5563;
            --text-tertiary: #6B7280;
            
            /* 边框和阴影 */
            --border-color: #E5E7EB;
            --border-light: #F3F4F6;
            --border-dark: #D1D5DB;
            
            --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
            --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            
            /* 圆角 */
            --radius-xs: 4px;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --radius-2xl: 24px;
            --radius-full: 9999px;
            
            /* 间距 */
            --space-1: 0.25rem;
            --space-2: 0.5rem;
            --space-3: 0.75rem;
            --space-4: 1rem;
            --space-5: 1.25rem;
            --space-6: 1.5rem;
            --space-8: 2rem;
            --space-10: 2.5rem;
            --space-12: 3rem;
            --space-16: 4rem;
            --space-20: 5rem;
            
            /* 字体 */
            --font-sans: 'Inter', 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
            --font-mono: 'Consolas', 'Monaco', 'Cascadia Code', 'JetBrains Mono', monospace;
            
            /* 过渡 */
            --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
            
            /* 层级 */
            --z-dropdown: 1000;
            --z-sticky: 1020;
            --z-fixed: 1030;
            --z-modal-backdrop: 1040;
            --z-modal: 1050;
            --z-popover: 1060;
            --z-tooltip: 1070;
            --z-toast: 1080;
            
            /* 2. 组件变量 */
            --header-height: 70px;
            --sidebar-width: 250px;
            --modal-max-width: 800px;
            --card-min-width: 300px;
            
            /* 3. 响应式断点 */
            --breakpoint-sm: 576px;
            --breakpoint-md: 768px;
            --breakpoint-lg: 992px;
            --breakpoint-xl: 1200px;
            --breakpoint-2xl: 1536px;
                
            /* 容器宽度 */
            --container-sm: 640px;
            --container-md: 768px;
            --container-lg: 1024px;
            --container-xl: 1280px;
            --container-2xl: 1536px;
        }

        /* 深色主题变量 */
        [data-theme="dark"] {
            --bg-primary: #111827;
            --bg-secondary: #1F2937;
            --bg-tertiary: #374151;
            
            --text-primary: #F9FAFB;
            --text-secondary: #E5E7EB;
            --text-tertiary: #D1D5DB;
            
            --border-color: #374151;
            --border-light: #4B5563;
            --border-dark: #6B7280;
            
            --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
            --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
            --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

        /* CSS重置 */
        *, *::before, *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-primary);
            min-height: 100vh;
            overflow-x: hidden;
            padding-top: 70px;
            transition: background-color var(--transition-base), color var(--transition-base);
        }

        /* ============ 布局组件 ============ */
        .container {
            width: 100%;
            max-width: var(--container-2xl);
            margin: 0 auto;
            padding: 0 var(--space-4);
        }

        .grid {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-4);
            /* Grid fallback */
            display: grid;
        }

        .grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
        .grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
        .grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
        .grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
        .grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
        .grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
        .grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

        .flex {
            display: flex;
        }

        .flex-col {
            flex-direction: column;
        }

        .items-center {
            align-items: center;
        }

        .justify-between {
            justify-content: space-between;
        }

        .gap-2 { gap: var(--space-2); }
        .gap-3 { gap: var(--space-3); }
        .gap-4 { gap: var(--space-4); }
        .gap-6 { gap: var(--space-6); }
        .gap-8 { gap: var(--space-8); }





        /* ============ 导航栏 ============ */
        .navbar {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            color: white;
            padding: var(--space-3) 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: var(--z-fixed);
            box-shadow: var(--shadow-lg);
            backdrop-filter: blur(10px);
            background-color: rgba(30, 60, 114, 0.95);
            transition: all var(--transition-base);
        }

        .navbar.scrolled {
            padding: var(--space-2) 0;
            background-color: rgba(30, 60, 114, 0.98);
            box-shadow: var(--shadow-xl);
            transform: translateY(0);
        }

        .navbar:hover {
            box-shadow: var(--shadow-xl);
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: var(--space-6);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            font-size: 1.5rem;
            font-weight: 700;
            white-space: nowrap;
            cursor: pointer;
            transition: transform var(--transition-fast);
            text-decoration: none;
            color: white;
        }

        .logo:hover {
            transform: translateY(-2px);
        }

        .logo-icon {
            font-size: 2rem;
            color: var(--secondary-color);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }

        .logo-text {
            background: linear-gradient(135deg, white 0%, var(--secondary-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            flex-wrap: wrap;
            justify-content: flex-end;
            flex: 1;
            transition: all var(--transition-base);
        }

        /* 导航搜索框 */
        .nav-search {
            display: flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-full);
            padding: var(--space-1) var(--space-2);
            margin-right: var(--space-3);
            transition: all var(--transition-base);
            border: 1px solid rgba(255, 255, 255, 0.1);
            max-width: 280px;
            flex: 1;
        }

        .nav-search:hover,
        .nav-search:focus-within {
            background: rgba(255, 255, 255, 0.25);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
        }

        .nav-search-input {
            background: transparent;
            border: none;
            color: white;
            padding: var(--space-2) var(--space-3);
            font-size: 0.9rem;
            flex: 1;
            outline: none;
            transition: all var(--transition-fast);
        }

        .nav-search-input::placeholder {
            color: rgba(255, 255, 255, 0.7);
            transition: all var(--transition-fast);
        }

        .nav-search-input:focus::placeholder {
            opacity: 0.5;
        }

        .nav-search-btn {
            background: transparent;
            border: none;
            color: rgba(255, 255, 255, 0.8);
            cursor: pointer;
            padding: var(--space-2);
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-search-btn:hover {
            color: white;
            background: rgba(255, 255, 255, 0.2);
            transform: scale(1.1);
        }

        /* 主导航链接样式优化 */
        .nav-link.primary {
            background: rgba(255, 107, 53, 0.2);
            border-color: rgba(255, 107, 53, 0.3);
        }

        .nav-link.primary:hover {
            background: rgba(255, 107, 53, 0.3);
            transform: translateY(-2px);
        }

        .nav-link {
            position: relative;
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            padding: var(--space-2) var(--space-4);
            border-radius: var(--radius-md);
            transition: all var(--transition-base);
            font-size: 0.95rem;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: var(--space-2);
            cursor: pointer;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.1);
            overflow: hidden;
        }

        .nav-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
            transition: all var(--transition-base);
        }

        .nav-link:hover::before {
            left: 100%;
        }

        .nav-link:hover {
            background: rgba(255, 255, 255, 0.25);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-3px);
            color: white;
            box-shadow: var(--shadow-md);
        }

        .nav-link.active {
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
            color: white;
            border-color: transparent;
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .nav-link.active::before {
            display: none;
        }

        .nav-link-badge {
            position: absolute;
            top: -6px;
            right: -6px;
            background: var(--danger-color);
            color: white;
            font-size: 0.6rem;
            padding: 2px 6px;
            border-radius: var(--radius-full);
            min-width: 18px;
            text-align: center;
            font-weight: 600;
            animation: bounce 1s infinite;
        }

        @keyframes bounce {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-4px); }
        }

        .user-menu {
            position: relative;
            transition: all var(--transition-base);
        }

        .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-full);
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
            cursor: pointer;
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: all var(--transition-base);
            position: relative;
        }

        .user-avatar::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            border-radius: var(--radius-full);
            background: linear-gradient(45deg, var(--secondary-light), var(--secondary-color), var(--primary-color));
            z-index: -1;
            opacity: 0;
            transition: all var(--transition-base);
        }

        .user-avatar:hover::before {
            opacity: 1;
            animation: rotate 2s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .user-avatar:hover {
            transform: scale(1.15);
            border-color: var(--secondary-light);
            box-shadow: 0 0 30px rgba(255, 107, 53, 0.4);
        }

        .user-dropdown {
            position: absolute;
            top: calc(100% + 15px);
            right: 0;
            background: var(--bg-primary);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-2xl);
            min-width: 260px;
            display: none;
            z-index: var(--z-dropdown);
            border: 1px solid var(--border-color);
            overflow: hidden;
            opacity: 0;
            transform: translateY(-10px) scale(0.95);
            transition: all var(--transition-base);
        }

        .user-menu:hover .user-dropdown {
            display: block;
            opacity: 1;
            transform: translateY(0) scale(1);
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .dropdown-item {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            padding: var(--space-3) var(--space-4);
            color: var(--text-primary);
            text-decoration: none;
            transition: all var(--transition-fast);
            border-bottom: 1px solid var(--border-light);
        }

        .dropdown-item:hover {
            background: var(--bg-tertiary);
            color: var(--primary-color);
        }

        .dropdown-item i {
            width: 20px;
            text-align: center;
            color: var(--text-tertiary);
        }

        .dropdown-item:hover i {
            color: var(--primary-color);
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: var(--space-2);
            transition: transform var(--transition-fast);
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.1);
        }

        .menu-toggle:hover {
            transform: scale(1.1);
            background: rgba(255, 255, 255, 0.2);
        }

        /* ============ 浏览器组件 ============ */
        .browser-container {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            padding: var(--space-8);
            margin: var(--space-8) 0;
            box-shadow: var(--shadow-xl);
            border: 1px solid var(--border-color);
            transition: all var(--transition-base);
        }

        .browser-container:hover {
            box-shadow: var(--shadow-2xl);
        }

        .browser-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--space-6);
            padding-bottom: var(--space-4);
            border-bottom: 2px solid var(--border-color);
        }

        .browser-tabs {
            display: flex;
            gap: var(--space-2);
            margin-bottom: var(--space-4);
            overflow-x: auto;
            padding-bottom: var(--space-2);
            scrollbar-width: thin;
        }

        .browser-tabs::-webkit-scrollbar {
            height: 6px;
        }

        .browser-tabs::-webkit-scrollbar-track {
            background: var(--bg-tertiary);
            border-radius: var(--radius-full);
        }

        .browser-tabs::-webkit-scrollbar-thumb {
            background: var(--border-dark);
            border-radius: var(--radius-full);
        }

        .browser-tab {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            padding: var(--space-2) var(--space-4);
            background: var(--bg-secondary);
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            border: 1px solid var(--border-color);
            border-bottom: none;
            cursor: pointer;
            white-space: nowrap;
            transition: all var(--transition-fast);
            position: relative;
            min-width: 120px;
            max-width: 200px;
        }

        .browser-tab:hover {
            background: var(--bg-tertiary);
        }

        .browser-tab.active {
            background: var(--bg-primary);
            border-color: var(--border-dark);
            box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
            z-index: 1;
        }

        .tab-favicon {
            width: 16px;
            height: 16px;
            flex-shrink: 0;
        }

        .tab-title {
            flex: 1;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            font-size: 0.9rem;
        }

        .tab-close {
            width: 18px;
            height: 18px;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-tertiary);
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }

        .tab-close:hover {
            background: var(--danger-light);
            color: white;
        }

        .browser-controls {
            display: flex;
            gap: var(--space-3);
            margin-bottom: var(--space-6);
            flex-wrap: wrap;
            align-items: center;
        }

        .browser-url-input {
            flex: 1;
            min-width: 300px;
            padding: var(--space-3) var(--space-4);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-lg);
            font-size: 1rem;
            font-family: var(--font-sans);
            transition: all var(--transition-fast);
            background: var(--bg-secondary);
            color: var(--text-primary);
        }

        .browser-url-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.1);
            background: var(--bg-primary);
        }

        .browser-toolbar {
            display: flex;
            gap: var(--space-2);
            margin-bottom: var(--space-4);
        }

        .toolbar-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: var(--radius-md);
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .toolbar-btn:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
            transform: translateY(-1px);
        }

        .toolbar-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .browser-content {
            display: flex;
            gap: var(--space-6);
            min-height: 600px;
        }

        .browser-sidebar {
            width: 250px;
            flex-shrink: 0;
            display: flex;
            flex-direction: column;
            gap: var(--space-4);
        }

        .browser-main {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .bookmarks-panel {
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            border: 1px solid var(--border-color);
        }

        .history-panel {
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            border: 1px solid var(--border-color);
            flex: 1;
            overflow-y: auto;
        }

        .browser-iframe-container {
            flex: 1;
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            background: white;
            min-height: 600px;
            z-index: 1;
            box-shadow: var(--shadow-sm);
        }

        .browser-iframe {
            width: 100%;
            height: 100%;
            border: none;
            background: transparent;
            position: relative;
            z-index: 2;
            opacity: 1;
            transition: opacity var(--transition-fast);
        }

        .browser-iframe.loading {
            opacity: 0.3;
        }

        .iframe-loading {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(4px);
            display: none;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: var(--space-4);
            z-index: 30;
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .iframe-loading.show {
            opacity: 1;
            display: flex;
        }

        .iframe-loading.hide {
            opacity: 0;
        }

        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 3px solid var(--border-color);
            border-top-color: var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        /* ============ 卡片组件 ============ */
        .card-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: var(--space-6);
            margin: var(--space-8) 0;
            transition: all var(--transition-base);
            /* Grid fallback */
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
        }
        
        /* 增强卡片网格的响应式设计 */
        @media (max-width: var(--breakpoint-lg)) {
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
                gap: var(--space-5);
            }
        }
        
        @media (max-width: var(--breakpoint-md)) {
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
                gap: var(--space-4);
            }
        }
        
        @media (max-width: var(--breakpoint-sm)) {
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
                gap: var(--space-3);
            }
        }

        .link-card {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            box-shadow: var(--shadow-lg);
            transition: all var(--transition-base);
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .link-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-2xl);
            border-color: var(--primary-light);
        }

        .link-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-light) 100%);
        }

        .card-icon {
            font-size: 3rem;
            margin-bottom: var(--space-4);
            color: var(--primary-color);
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary-color) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .card-title {
            font-size: 1.4rem;
            font-weight: 600;
            margin-bottom: var(--space-3);
            color: var(--text-primary);
        }

        .card-description {
            color: var(--text-secondary);
            margin-bottom: var(--space-6);
            font-size: 1rem;
            line-height: 1.6;
            flex: 1;
        }

        .card-badge {
            display: inline-block;
            padding: var(--space-1) var(--space-3);
            background: var(--success-light);
            color: var(--success-dark);
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: var(--space-3);
        }

        /* ============ 按钮组件 ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-2);
            padding: var(--space-3) var(--space-6);
            border: none;
            border-radius: var(--radius-lg);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all var(--transition-fast);
            text-decoration: none;
            white-space: nowrap;
            font-family: var(--font-sans);
            position: relative;
            overflow: hidden;
        }

        .btn::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s ease;
        }

        .btn:hover::after {
            left: 100%;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
            color: white;
        }

        .btn-primary:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-primary);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover:not(:disabled) {
            background: var(--bg-tertiary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .btn-success {
            background: linear-gradient(135deg, var(--success-color) 0%, var(--success-dark) 100%);
            color: white;
        }

        .btn-warning {
            background: linear-gradient(135deg, var(--warning-color) 0%, var(--warning-dark) 100%);
            color: white;
        }

        .btn-danger {
            background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-dark) 100%);
            color: white;
        }

        .btn-info {
            background: linear-gradient(135deg, var(--info-color) 0%, var(--info-dark) 100%);
            color: white;
        }

        .btn-outline {
            background: transparent;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
        }

        .btn-outline:hover {
            background: var(--primary-color);
            color: white;
        }

        .btn-sm {
            padding: var(--space-2) var(--space-4);
            font-size: 0.85rem;
        }

        .btn-lg {
            padding: var(--space-4) var(--space-8);
            font-size: 1.1rem;
        }

        .btn-block {
            width: 100%;
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none !important;
            box-shadow: none !important;
        }

        /* ============ 模态框组件 ============ */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            z-index: var(--z-modal);
            align-items: center;
            justify-content: center;
            padding: var(--space-4);
            animation: fadeIn 0.3s ease;
            backdrop-filter: blur(4px);
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .modal-content {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            width: 100%;
            max-width: 800px;
            max-height: 90vh;
            overflow-y: auto;
            animation: slideUp 0.3s ease;
            box-shadow: var(--shadow-2xl);
            border: 1px solid var(--border-color);
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .modal-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            color: white;
            padding: var(--space-6);
            border-radius: var(--radius-xl) var(--radius-xl) 0 0;
            position: sticky;
            top: 0;
            z-index: 1;
        }

        .modal-title {
            font-size: 1.5rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        .modal-close {
            position: absolute;
            top: var(--space-4);
            right: var(--space-4);
            width: 36px;
            height: 36px;
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.1);
            color: white;
            cursor: pointer;
            transition: all var(--transition-fast);
            border: none;
            font-size: 1.5rem;
        }

        .modal-close:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: rotate(90deg);
        }

        .modal-body {
            padding: var(--space-6);
        }

        .modal-footer {
            padding: var(--space-4) var(--space-6);
            border-top: 1px solid var(--border-color);
            background: var(--bg-secondary);
            border-radius: 0 0 var(--radius-xl) var(--radius-xl);
            display: flex;
            justify-content: flex-end;
            gap: var(--space-3);
        }

        /* ============ 表单组件 ============ */
        .form-group {
            margin-bottom: var(--space-6);
        }

        .form-label {
            display: block;
            margin-bottom: var(--space-2);
            color: var(--text-primary);
            font-weight: 500;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .form-label-required::after {
            content: '*';
            color: var(--danger-color);
            margin-left: 2px;
        }

        .form-control {
            width: 100%;
            padding: var(--space-3) var(--space-4);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-lg);
            font-size: 1rem;
            font-family: var(--font-sans);
            transition: all var(--transition-fast);
            background: var(--bg-secondary);
            color: var(--text-primary);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.1);
            background: var(--bg-primary);
        }

        .form-control:hover {
            border-color: var(--border-dark);
        }

        .form-text {
            font-size: 0.85rem;
            color: var(--text-tertiary);
            margin-top: var(--space-2);
            display: block;
        }

        .form-error {
            color: var(--danger-color);
            font-size: 0.85rem;
            margin-top: var(--space-1);
            display: none;
            align-items: center;
            gap: var(--space-1);
        }

        .form-error.show {
            display: flex;
        }

        .input-group {
            display: flex;
            gap: var(--space-2);
        }

        .input-group .form-control {
            flex: 1;
        }

        .input-group .btn {
            flex-shrink: 0;
        }

        .form-select {
            appearance: none;
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
            background-position: right 0.5rem center;
            background-repeat: no-repeat;
            background-size: 1.5em 1.5em;
            padding-right: 2.5rem;
        }

        .form-check {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            cursor: pointer;
        }

        .form-check-input {
            width: 18px;
            height: 18px;
            border: 2px solid var(--border-color);
            border-radius: var(--radius-sm);
            background: var(--bg-primary);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .form-check-input:checked {
            background: var(--primary-color);
            border-color: var(--primary-color);
        }

        /* ============ 标签页组件 ============ */
        .tabs {
            display: flex;
            background: var(--bg-tertiary);
            border-radius: var(--radius-lg);
            padding: var(--space-1);
            margin-bottom: var(--space-6);
            overflow-x: auto;
            scrollbar-width: none;
        }

        .tabs::-webkit-scrollbar {
            display: none;
        }

        .tab {
            flex: 1;
            padding: var(--space-3) var(--space-4);
            text-align: center;
            cursor: pointer;
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
            color: var(--text-secondary);
            font-weight: 500;
            white-space: nowrap;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-2);
            min-width: 120px;
        }

        .tab:hover {
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-primary);
        }

        .tab.active {
            background: var(--bg-primary);
            color: var(--primary-color);
            box-shadow: var(--shadow-sm);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.3s ease;
        }

        /* ============ 表格组件 ============ */
        .table-container {
            background: var(--bg-primary);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            overflow-x: auto;
        }

        .table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        .table th {
            background: var(--bg-tertiary);
            padding: var(--space-3) var(--space-4);
            text-align: left;
            font-weight: 600;
            color: var(--text-primary);
            border-bottom: 2px solid var(--border-color);
            white-space: nowrap;
        }

        .table td {
            padding: var(--space-3) var(--space-4);
            border-bottom: 1px solid var(--border-color);
            color: var(--text-secondary);
        }

        .table tr:hover {
            background: var(--bg-tertiary);
        }

        .table tr:last-child td {
            border-bottom: none;
        }

        /* ============ 消息通知组件 ============ */
        .toast-container {
            position: fixed;
            top: 90px;
            right: 20px;
            z-index: var(--z-toast);
            display: flex;
            flex-direction: column;
            gap: var(--space-3);
            max-width: 400px;
        }

        .toast {
            background: var(--bg-primary);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            box-shadow: var(--shadow-xl);
            display: none;
            align-items: flex-start;
            gap: var(--space-3);
            animation: slideInRight 0.3s ease;
            border-left: 4px solid;
            border: 1px solid var(--border-color);
            max-width: 400px;
            min-width: 300px;
        }

        @keyframes slideInRight {
            from {
                opacity: 0;
                transform: translateX(100%);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .toast.success {
            border-left-color: var(--success-color);
        }

        .toast.error {
            border-left-color: var(--danger-color);
        }

        .toast.warning {
            border-left-color: var(--warning-color);
        }

        .toast.info {
            border-left-color: var(--info-color);
        }

        .toast-icon {
            font-size: 1.3rem;
            flex-shrink: 0;
        }

        .toast.success .toast-icon {
            color: var(--success-color);
        }

        .toast.error .toast-icon {
            color: var(--danger-color);
        }

        .toast.warning .toast-icon {
            color: var(--warning-color);
        }

        .toast.info .toast-icon {
            color: var(--info-color);
        }

        .toast-content {
            flex: 1;
        }

        .toast-title {
            font-weight: 600;
            margin-bottom: var(--space-1);
            color: var(--text-primary);
        }

        .toast-message {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        .toast-close {
            background: none;
            border: none;
            color: var(--text-tertiary);
            cursor: pointer;
            font-size: 1.2rem;
            padding: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-full);
            transition: all var(--transition-fast);
            flex-shrink: 0;
        }

        .toast-close:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }

        /* ============ 加载状态 ============ */
        .loading {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: var(--space-12);
            color: var(--text-tertiary);
            text-align: center;
        }

        .loading-spinner {
            width: 50px;
            height: 50px;
            border: 3px solid var(--border-color);
            border-top-color: var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-bottom: var(--space-4);
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .loading-text {
            font-size: 1rem;
            color: var(--text-secondary);
        }

        .skeleton {
            background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
            background-size: 200% 100%;
            animation: loading 1.5s infinite;
            border-radius: var(--radius-md);
        }

        @keyframes loading {
            0% { background-position: 200% 0; }
            100% { background-position: -200% 0; }
        }

        /* ============ 空状态 ============ */
        .empty-state {
            text-align: center;
            padding: var(--space-12) var(--space-4);
            color: var(--text-tertiary);
        }

        .empty-state-icon {
            font-size: 4rem;
            margin-bottom: var(--space-4);
            color: var(--border-color);
            opacity: 0.5;
        }

        .empty-state-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: var(--space-2);
            color: var(--text-secondary);
        }

        .empty-state-description {
            margin-bottom: var(--space-6);
            max-width: 400px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ============ 仪表盘组件 ============ */
        .dashboard {
            padding: var(--space-6);
        }

        .dashboard-header {
            margin-bottom: var(--space-8);
        }

        .dashboard-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: var(--space-2);
            color: var(--text-primary);
        }

        .dashboard-subtitle {
            color: var(--text-tertiary);
            font-size: 1.1rem;
        }

        .widget-grid {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-6);
            margin-bottom: var(--space-8);
            /* Grid fallback */
            display: grid;
            grid-template-columns: repeat(12, 1fr);
        }

        .widget {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .widget:hover {
            box-shadow: var(--shadow-xl);
            border-color: var(--primary-light);
        }

        .widget-header {
            padding: var(--space-4) var(--space-6);
            border-bottom: 1px solid var(--border-color);
            background: var(--bg-secondary);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .widget-title {
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .widget-controls {
            display: flex;
            gap: var(--space-2);
        }

        .widget-body {
            padding: var(--space-6);
        }

        .widget-footer {
            padding: var(--space-4) var(--space-6);
            border-top: 1px solid var(--border-color);
            background: var(--bg-secondary);
        }

        /* 响应式尺寸 */
        .widget-1 { grid-column: span 1; }
        .widget-2 { grid-column: span 2; }
        .widget-3 { grid-column: span 3; }
        .widget-4 { grid-column: span 4; }
        .widget-5 { grid-column: span 5; }
        .widget-6 { grid-column: span 6; }
        .widget-7 { grid-column: span 7; }
        .widget-8 { grid-column: span 8; }
        .widget-9 { grid-column: span 9; }
        .widget-10 { grid-column: span 10; }
        .widget-11 { grid-column: span 11; }
        .widget-12 { grid-column: span 12; }

        /* ============ 统计卡片 ============ */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: var(--space-6);
            margin: var(--space-8) 0;
        }

        .stat-card {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            border: 1px solid var(--border-color);
            transition: all var(--transition-base);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
            border-color: var(--primary-light);
        }

        .stat-card-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: var(--space-4);
        }

        .stat-card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: white;
        }

        .stat-card-icon.primary { background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%); }
        .stat-card-icon.success { background: linear-gradient(135deg, var(--success-color) 0%, var(--success-light) 100%); }
        .stat-card-icon.warning { background: linear-gradient(135deg, var(--warning-color) 0%, var(--warning-light) 100%); }
        .stat-card-icon.danger { background: linear-gradient(135deg, var(--danger-color) 0%, var(--danger-light) 100%); }

        .stat-card-trend {
            display: flex;
            align-items: center;
            gap: var(--space-1);
            font-size: 0.85rem;
            font-weight: 600;
        }

        .stat-card-trend.up {
            color: var(--success-color);
        }

        .stat-card-trend.down {
            color: var(--danger-color);
        }

        .stat-card-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--space-1);
        }

        .stat-card-label {
            color: var(--text-tertiary);
            font-size: 0.9rem;
        }

        .stat-card-progress {
            margin-top: var(--space-4);
        }

        .progress {
            height: 6px;
            background: var(--bg-tertiary);
            border-radius: var(--radius-full);
            overflow: hidden;
        }

        .progress-bar {
            height: 100%;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
            border-radius: var(--radius-full);
            transition: width 0.5s ease;
        }

        /* ============ AI助手组件 ============ */
        .ai-container {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 700px;
        }

        .ai-header {
            padding: var(--space-4) var(--space-6);
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            color: white;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .ai-title {
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        .ai-status {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            font-size: 0.85rem;
            opacity: 0.9;
        }

        .ai-status-dot {
            width: 8px;
            height: 8px;
            border-radius: var(--radius-full);
            background: var(--success-color);
            animation: pulse 2s infinite;
        }

        .ai-sidebar {
            width: 280px;
            background: var(--bg-secondary);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .ai-conversations {
            flex: 1;
            overflow-y: auto;
            padding: var(--space-4);
        }

        .ai-main {
            flex: 1;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .ai-messages {
            flex: 1;
            overflow-y: auto;
            padding: var(--space-6);
            display: flex;
            flex-direction: column;
            gap: var(--space-4);
        }

        .ai-input-container {
            padding: var(--space-4);
            border-top: 1px solid var(--border-color);
            background: var(--bg-primary);
        }

        .ai-input-wrapper {
            display: flex;
            gap: var(--space-3);
        }

        .ai-input {
            flex: 1;
            padding: var(--space-3) var(--space-4);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-lg);
            font-size: 1rem;
            font-family: var(--font-sans);
            resize: none;
            min-height: 60px;
            max-height: 120px;
            transition: all var(--transition-fast);
            background: var(--bg-secondary);
            color: var(--text-primary);
        }

        .ai-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.1);
            background: var(--bg-primary);
        }

        .ai-input-actions {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: var(--space-3);
        }

        .ai-input-stats {
            font-size: 0.85rem;
            color: var(--text-tertiary);
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        .ai-input-buttons {
            display: flex;
            gap: var(--space-2);
        }

        .message {
            max-width: 85%;
            padding: var(--space-4) var(--space-5);
            border-radius: var(--radius-xl);
            line-height: 1.6;
            position: relative;
            word-wrap: break-word;
            animation: messageIn 0.3s ease;
        }

        @keyframes messageIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message.user {
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
            color: white;
            align-self: flex-end;
            border-bottom-right-radius: var(--space-2);
        }

        .message.assistant {
            background: var(--bg-secondary);
            color: var(--text-primary);
            align-self: flex-start;
            border-bottom-left-radius: var(--space-2);
            border: 1px solid var(--border-color);
        }

        .message.system {
            background: var(--warning-light);
            color: var(--warning-dark);
            align-self: center;
            font-size: 0.9rem;
            text-align: center;
            max-width: 90%;
            border: 1px solid var(--warning-color);
        }

        .message-header {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            margin-bottom: var(--space-2);
            font-size: 0.9rem;
            opacity: 0.9;
        }

        .message-content {
            line-height: 1.7;
        }

        .message-content pre {
            background: rgba(0, 0, 0, 0.1);
            border-radius: var(--radius-lg);
            padding: var(--space-3);
            overflow-x: auto;
            margin: var(--space-3) 0;
        }

        .message-content code {
            background: rgba(0, 0, 0, 0.1);
            padding: 2px 6px;
            border-radius: var(--radius-sm);
            font-family: var(--font-mono);
            font-size: 0.9em;
        }

        .message-time {
            font-size: 0.75rem;
            opacity: 0.7;
            margin-top: var(--space-2);
            text-align: right;
        }

        .message-actions {
            display: flex;
            gap: var(--space-2);
            margin-top: var(--space-3);
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .message:hover .message-actions {
            opacity: 1;
        }

        /* ============ 工具组件 ============ */
        .tools-container {
            padding: var(--space-4);
        }

        .tools-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: var(--space-4);
            margin-bottom: var(--space-8);
        }

        .tool-card {
            background: var(--bg-primary);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            border: 1px solid var(--border-color);
            transition: all var(--transition-base);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: var(--space-4);
        }

        .tool-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }

        .tool-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            flex-shrink: 0;
        }

        .tool-info {
            flex: 1;
        }

        .tool-name {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--space-1);
        }

        .tool-description {
            font-size: 0.9rem;
            color: var(--text-tertiary);
            margin-bottom: var(--space-2);
        }

        .tool-meta {
            display: flex;
            gap: var(--space-3);
            font-size: 0.8rem;
            color: var(--text-tertiary);
        }

        .tool-access {
            padding: 2px 8px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--bg-tertiary);
        }

        /* ============ 计算器组件 ============ */
        .calculator {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            border: 1px solid var(--border-color);
            max-width: 600px;
            margin: 0 auto;
        }

        .calculator-display {
            background: var(--bg-secondary);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            margin-bottom: var(--space-4);
            text-align: right;
            font-size: 2rem;
            font-family: var(--font-mono);
            border: 2px solid var(--border-color);
            min-height: 80px;
            overflow-x: auto;
            word-break: break-all;
            display: flex;
            align-items: center;
            justify-content: flex-end;
        }

        .calculator-buttons {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: var(--space-2);
        }

        .calculator-btn {
            padding: var(--space-3) var(--space-2);
            font-size: 1.1rem;
            border: none;
            border-radius: var(--radius-lg);
            background: var(--bg-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
            font-weight: 500;
            color: var(--text-primary);
            font-family: var(--font-mono);
        }

        .calculator-btn:hover {
            background: var(--bg-tertiary);
            transform: translateY(-2px);
        }

        .calculator-btn.operator {
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
            color: white;
        }

        .calculator-btn.operator:hover {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
        }

        .calculator-btn.function {
            background: var(--warning-light);
            color: var(--warning-dark);
        }

        .calculator-btn.equals {
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
            color: white;
            grid-column: span 2;
        }

        .calculator-btn.equals:hover {
            background: linear-gradient(135deg, var(--secondary-light) 0%, var(--secondary-color) 100%);
        }

        .calculator-btn.memory {
            background: var(--info-light);
            color: var(--info-dark);
            font-size: 0.9rem;
        }

        /* ============ 用户体验增强 ============ */
        /* 1. 平滑滚动增强 */
        html {
            scroll-behavior: smooth;
        }
        
        /* 2. 焦点状态优化 */
        *:focus {
            outline: 2px solid var(--primary-color);
            outline-offset: 2px;
            transition: all var(--transition-fast);
        }
        
        /* 3. 无障碍访问优化 */
        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }
        
        /* 4. 拖放反馈 */
        .drag-over {
            background: var(--bg-tertiary);
            border: 2px dashed var(--primary-color);
            opacity: 0.8;
            transition: all var(--transition-base);
        }
        
        /* 5. 高级加载状态 */
        .loading-enhanced {
            position: relative;
            overflow: hidden;
        }
        
        .loading-enhanced::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            animation: shimmer 2s infinite;
        }
        
        @keyframes shimmer {
            0% { left: -100%; }
            100% { left: 100%; }
        }
        
        /* 6. 触摸设备优化 */
        @media (hover: none) and (pointer: coarse) {
            .btn, .nav-link, .tab {
                min-height: 44px;
                min-width: 44px;
            }
            
            .nav-search-input {
                font-size: 16px; /* 防止iOS缩放 */
            }
        }
        
        /* 7. 增强交互元素的视觉反馈 */
        .btn, .nav-link, .tab, .link-card, .stat-card, .app-card, .resource-card {
            transition: all var(--transition-base) ease-in-out;
        }
        
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .nav-link:hover {
            color: var(--primary-color);
            background-color: var(--bg-tertiary);
        }
        
        /* 8. 增强卡片悬浮效果 */
        .link-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-light) 100%);
            transition: all var(--transition-base);
        }
        
        .link-card:hover::before {
            height: 100%;
            opacity: 0.1;
            z-index: -1;
        }
        
        /* 9. 增强表单元素的交互体验 */
        input[type="text"], input[type="email"], input[type="password"], textarea, select {
            transition: all var(--transition-base);
            border: 1px solid var(--border-color);
            background-color: var(--bg-primary);
            color: var(--text-primary);
        }
        
        input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, textarea:focus, select:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.1);
        }
        
        /* 10. 增强模态框的视觉效果 */
        .modal-content {
            animation: modalFadeIn var(--transition-slow) ease-out;
        }
        
        @keyframes modalFadeIn {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ============ 应用商店组件 ============ */
        .app-store-container {
            padding: var(--space-4);
        }

        .app-store-header {
            margin-bottom: var(--space-8);
        }

        .app-store-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--space-4);
            margin-bottom: var(--space-6);
        }

        .app-filters {
            display: flex;
            gap: var(--space-4);
            margin-bottom: var(--space-6);
            flex-wrap: wrap;
        }

        .app-search {
            flex: 1;
            min-width: 300px;
            position: relative;
        }

        .app-search input {
            width: 100%;
            padding: var(--space-3) var(--space-4) var(--space-3) var(--space-10);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-lg);
            font-size: 1rem;
            background: var(--bg-secondary);
            color: var(--text-primary);
        }

        .app-search-icon {
            position: absolute;
            left: var(--space-4);
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-tertiary);
        }

        .app-categories {
            display: flex;
            gap: var(--space-2);
            overflow-x: auto;
            padding-bottom: var(--space-2);
            margin-bottom: var(--space-6);
            scrollbar-width: thin;
        }

        .category-btn {
            padding: var(--space-2) var(--space-4);
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-full);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }

        .category-btn:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }

        .category-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .apps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: var(--space-6);
            margin-bottom: var(--space-8);
        }

        .app-card {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            border: 1px solid var(--border-color);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
            gap: var(--space-4);
        }

        .app-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-2xl);
            border-color: var(--primary-light);
        }

        .app-card-header {
            display: flex;
            align-items: flex-start;
            gap: var(--space-4);
        }

        .app-icon {
            width: 64px;
            height: 64px;
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.8rem;
            flex-shrink: 0;
        }

        .app-info {
            flex: 1;
        }

        .app-title {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: var(--space-1);
            color: var(--text-primary);
        }

        .app-developer {
            font-size: 0.9rem;
            color: var(--text-tertiary);
            margin-bottom: var(--space-2);
        }

        .app-rating {
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .stars {
            color: var(--warning-color);
        }

        .app-rating-value {
            font-weight: 600;
            color: var(--text-primary);
        }

        .app-description {
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
            margin-bottom: var(--space-4);
        }

        .app-meta {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-3);
            margin-bottom: var(--space-4);
        }

        .app-meta-item {
            display: flex;
            align-items: center;
            gap: var(--space-1);
            font-size: 0.85rem;
            color: var(--text-tertiary);
        }

        .app-actions {
            display: flex;
            gap: var(--space-2);
        }

        /* ============ 资源中心组件 ============ */
        .resources-container {
            padding: var(--space-4);
        }

        .resources-header {
            margin-bottom: var(--space-8);
        }

        .resources-toolbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--space-6);
            flex-wrap: wrap;
            gap: var(--space-4);
        }

        .resources-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: var(--space-6);
            margin-bottom: var(--space-8);
        }

        .resource-card {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: all var(--transition-base);
        }

        .resource-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
            border-color: var(--primary-light);
        }

        .resource-thumbnail {
            width: 100%;
            height: 160px;
            background: var(--bg-tertiary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-tertiary);
            font-size: 2rem;
        }

        .resource-content {
            padding: var(--space-4);
        }

        .resource-category {
            display: inline-block;
            padding: var(--space-1) var(--space-3);
            background: var(--primary-light);
            color: white;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: var(--space-2);
        }

        .resource-title {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--space-2);
            line-height: 1.4;
        }

        .resource-description {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: var(--space-4);
            line-height: 1.5;
        }

        .resource-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: var(--text-tertiary);
        }

        /* ============ 会员中心组件 ============ */
        .membership-container {
            padding: var(--space-4);
        }

        .membership-header {
            text-align: center;
            margin-bottom: var(--space-8);
        }

        .membership-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: var(--space-2);
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .membership-subtitle {
            color: var(--text-tertiary);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        .membership-levels {
            display: flex;
            gap: var(--space-4);
            overflow-x: auto;
            padding: var(--space-4) 0;
            margin-bottom: var(--space-8);
            scrollbar-width: thin;
        }

        .level-card {
            background: var(--bg-primary);
            border-radius: var(--radius-xl);
            padding: var(--space-6);
            border: 2px solid var(--border-color);
            min-width: 280px;
            transition: all var(--transition-base);
            position: relative;
            overflow: hidden;
        }

        .level-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-xl);
        }

        .level-card.current {
            border-color: var(--secondary-color);
            box-shadow: 0 0 30px rgba(255, 107, 53, 0.2);
        }

        .level-card.premium {
            border-color: var(--warning-color);
        }

        .level-badge {
            position: absolute;
            top: 20px;
            right: -30px;
            background: var(--secondary-color);
            color: white;
            padding: var(--space-1) var(--space-8);
            transform: rotate(45deg);
            font-size: 0.75rem;
            font-weight: 600;
        }

        .level-header {
            text-align: center;
            margin-bottom: var(--space-6);
        }

        .level-icon {
            font-size: 3rem;
            margin-bottom: var(--space-4);
        }

        .level-name {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: var(--space-2);
        }

        .level-price {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: var(--space-4);
        }

        .level-price.free {
            color: var(--success-color);
        }

        .level-features {
            list-style: none;
            margin-bottom: var(--space-6);
        }

        .level-features li {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            margin-bottom: var(--space-3);
            color: var(--text-secondary);
        }

        .level-features li i {
            color: var(--success-color);
        }

        /* ============ 页脚组件 ============ */
        .footer {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
            color: white;
            padding: var(--space-12) var(--space-4);
            margin-top: var(--space-12);
            border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
        }

        .footer-content {
            max-width: var(--container-xl);
            margin: 0 auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--space-8);
            margin-bottom: var(--space-8);
        }

        .footer-section h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: var(--space-4);
            color: white;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: var(--space-2);
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: color var(--transition-fast);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .footer-links a:hover {
            color: white;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: var(--space-6);
            text-align: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }

        /* ============ 回到顶部按钮 ============ */
        .back-to-top {
            position: fixed;
            bottom: var(--space-6);
            right: var(--space-6);
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
            color: white;
            border: none;
            border-radius: var(--radius-full);
            cursor: pointer;
            display: none;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-lg);
            transition: all var(--transition-fast);
            z-index: var(--z-fixed);
        }

        .back-to-top:hover {
            transform: translateY(-4px) scale(1.1);
            box-shadow: var(--shadow-xl);
        }

        .back-to-top.show {
            display: flex;
            animation: bounceIn 0.3s ease;
        }

        @keyframes bounceIn {
            from {
                opacity: 0;
                transform: scale(0.5);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        /* ============ 分页组件 ============ */
        .pagination {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: var(--space-2);
            margin-top: var(--space-8);
        }

        .page-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .page-btn:hover {
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }

        .page-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .page-btn.disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        /* ============ 响应式设计 ============ */
        /* 基于CSS变量断点的现代响应式设计 */
        @media (max-width: 1200px) {
            .container {
                padding: 0 var(--space-4);
                max-width: var(--container-xl);
            }
            
            .widget-grid {
                grid-template-columns: repeat(6, 1fr);
            }
            
            /* 优化桌面端导航栏 */
            .nav-search {
                max-width: 280px;
            }
        }

        @media (max-width: 992px) {
            .container {
                max-width: var(--container-lg);
            }
            
            .nav-links {
                display: none;
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                bottom: 0;
                background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
                flex-direction: column;
                padding: var(--space-6) var(--space-4);
                gap: var(--space-2);
                box-shadow: var(--shadow-2xl);
                z-index: var(--z-dropdown);
                max-height: calc(100vh - var(--header-height));
                overflow-y: auto;
                backdrop-filter: blur(10px);
                animation: slideInUp 0.3s ease;
            }
            
            @keyframes slideInUp {
                from {
                    opacity: 0;
                    transform: translateY(20px);
                }
                to {
                    opacity: 1;
                    transform: translateY(0);
                }
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .menu-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
                width: 44px;
                height: 44px;
                border-radius: var(--radius-md);
                background: rgba(255, 255, 255, 0.15);
                border: 1px solid rgba(255, 255, 255, 0.2);
                color: white;
                transition: all var(--transition-base);
                cursor: pointer;
            }
            
            .menu-toggle:hover {
                background: rgba(255, 255, 255, 0.25);
                border-color: rgba(255, 255, 255, 0.3);
                transform: scale(1.05);
            }
            
            .menu-toggle.active {
                background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
                color: white;
                border-color: transparent;
                box-shadow: var(--shadow-md);
                transform: rotate(90deg);
            }
            
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
                gap: var(--space-4);
            }
            
            .browser-content {
                flex-direction: column;
                gap: var(--space-4);
            }
            
            .browser-sidebar {
                width: 100%;
                flex-direction: row;
                gap: var(--space-3);
            }
            
            .browser-sidebar > * {
                flex: 1;
                min-width: 0;
            }
            
            .ai-container {
                flex-direction: column;
                height: auto;
                min-height: 500px;
            }
            
            .ai-sidebar {
                width: 100%;
                height: 200px;
                border-right: none;
                border-bottom: 1px solid var(--border-color);
            }
            
            /* 改进平板端搜索体验 */
            .nav-links .nav-search {
                display: flex;
                margin-bottom: var(--space-4);
                max-width: 100%;
                order: -1;
            }
            
            .nav-search-input {
                flex: 1;
                font-size: 1rem;
                background: rgba(255, 255, 255, 0.9);
                color: var(--text-primary);
            }
            
            .nav-search-input::placeholder {
                color: var(--text-tertiary);
            }
            
            .nav-link {
                font-size: 1rem;
                padding: var(--space-3) var(--space-4);
                justify-content: flex-start;
                border-radius: var(--radius-md);
                background: rgba(255, 255, 255, 0.1);
                border: 1px solid rgba(255, 255, 255, 0.2);
                transition: all var(--transition-base);
                width: 100%;
                max-width: 280px;
                margin: 0 auto;
            }
            
            .nav-link:hover {
                background: rgba(255, 255, 255, 0.25);
                border-color: rgba(255, 255, 255, 0.4);
                transform: translateX(8px);
                box-shadow: var(--shadow-md);
            }
            
            .nav-link span {
                display: inline !important;
            }
        }

        @media (max-width: 768px) {
            body {
                padding-top: var(--header-height);
                font-size: 0.95rem;
            }
            
            .navbar {
                padding: var(--space-2) 0;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                z-index: var(--z-sticky);
                backdrop-filter: blur(10px);
                background: rgba(255, 255, 255, 0.95);
                box-shadow: var(--shadow-md);
            }
            
            [data-theme="dark"] .navbar {
                background: rgba(17, 24, 39, 0.95);
            }
            
            .logo-text {
                font-size: 1.1rem;
            }
            
            .container {
                max-width: 100%;
                padding: 0 var(--space-3);
            }
            
            .logo {
                font-size: 1.1rem;
                gap: var(--space-2);
            }
            
            .logo-icon {
                font-size: 1.4rem;
            }
            
            /* 移动端导航优化 */
            .nav-search {
                max-width: 180px;
                margin-right: var(--space-2);
                order: 2;
                transition: all var(--transition-base);
            }
            
            .nav-search:hover, .nav-search:focus-within {
                max-width: 220px;
                background: rgba(255, 255, 255, 0.3);
            }
            
            #guestLinks {
                order: 1;
                flex: 1;
                justify-content: flex-end;
            }
            
            .nav-link {
                font-size: 0.85rem;
                padding: var(--space-1) var(--space-2);
                gap: var(--space-1);
                transition: all var(--transition-base);
            }
            
            .nav-link:hover {
                transform: translateY(-2px);
                box-shadow: var(--shadow-sm);
            }
            
            .nav-link span {
                display: none;
            }
            
            /* 移动端菜单按钮优化 */
            .menu-toggle {
                width: 38px;
                height: 38px;
                margin-left: var(--space-1);
            }
            
            /* 移动端导航链接动画 */
            @keyframes navLinkFadeIn {
                from {
                    opacity: 0;
                    transform: translateX(-20px);
                }
                to {
                    opacity: 1;
                    transform: translateX(0);
                }
            }
            
            .nav-links.active .nav-link {
                animation: navLinkFadeIn 0.3s ease forwards;
            }
            
            .nav-links.active .nav-link:nth-child(1) { animation-delay: 0.1s; }
            .nav-links.active .nav-link:nth-child(2) { animation-delay: 0.15s; }
            .nav-links.active .nav-link:nth-child(3) { animation-delay: 0.2s; }
            .nav-links.active .nav-link:nth-child(4) { animation-delay: 0.25s; }
            .nav-links.active .nav-link:nth-child(5) { animation-delay: 0.3s; }
            
            .browser-container {
                padding: var(--space-3);
                margin: var(--space-3) 0;
                border-radius: var(--radius-lg);
            }
            
            .browser-controls {
                flex-direction: column;
                gap: var(--space-2);
            }
            
            .browser-url-input {
                min-width: 100%;
                font-size: 0.95rem;
            }
            
            .browser-iframe {
                height: 350px;
            }
            
            .modal-content {
                max-width: 95%;
                margin: var(--space-2);
            }
            
            .tabs {
                flex-wrap: wrap;
                gap: var(--space-1);
            }
            
            .tab {
                min-width: 80px;
                font-size: 0.9rem;
                padding: var(--space-2) var(--space-3);
            }
            
            .stats-grid {
                grid-template-columns: 1fr;
                gap: var(--space-3);
            }
            
            .apps-grid {
                grid-template-columns: 1fr;
                gap: var(--space-3);
            }
            
            .membership-levels {
                flex-direction: column;
                align-items: center;
                gap: var(--space-4);
            }
            
            .level-card {
                width: 100%;
                max-width: 400px;
            }
            
            .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
                gap: var(--space-6);
            }
            
            /* 改进移动端卡片布局 */
            .card-grid {
                grid-template-columns: 1fr;
                gap: var(--space-4);
            }
            
            .link-card {
                padding: var(--space-4);
            }
        }

        @media (max-width: 576px) {
            .logo {
                font-size: 0.9rem;
            }
            
            .logo-icon {
                font-size: 1.2rem;
            }
            
            /* 超小屏幕优化 */
            .nav-search {
                max-width: 140px;
            }
            
            .nav-search-input {
                font-size: 0.8rem;
                padding: var(--space-1) var(--space-2);
            }
            
            .card-grid {
                grid-template-columns: 1fr;
                gap: var(--space-3);
            }
            
            .modal-body {
                padding: var(--space-3);
            }
            
            .btn {
                padding: var(--space-2) var(--space-3);
                font-size: 0.85rem;
            }
            
            .calculator-buttons {
                grid-template-columns: repeat(4, 1fr);
                gap: var(--space-1);
            }
            
            .app-search {
                min-width: 100%;
                font-size: 0.9rem;
            }
            
            .footer {
                padding: var(--space-6) var(--space-3);
            }
            
            /* 移动端特殊优化 */
            .browser-iframe {
                height: 300px;
            }
            
            .modal-content {
                max-width: 98%;
                margin: var(--space-1);
            }
            
            .tabs {
                overflow-x: auto;
                scrollbar-width: thin;
            }
            
            .tabs::-webkit-scrollbar {
                height: 4px;
            }
        }

        @media (max-width: 375px) {
            /* 针对小屏幕手机优化 */
            .logo {
                font-size: 0.8rem;
            }
            
            .nav-search {
                max-width: 120px;
            }
            
            .browser-container {
                padding: var(--space-2);
                margin: var(--space-2) 0;
            }
            
            .modal-content {
                max-width: 100%;
                margin: 0;
                border-radius: 0;
            }
            
            .btn {
                padding: var(--space-1) var(--space-2);
                font-size: 0.8rem;
            }
            
            .nav-link {
                font-size: 0.8rem;
                padding: var(--space-1) var(--space-1);
            }
        }

        /* ============ 打印样式 ============ */
        @media print {
            .navbar,
            .footer,
            .back-to-top,
            .modal,
            .toast-container {
                display: none !important;
            }
            
            body {
                padding-top: 0;
                background: white !important;
                color: black !important;
            }
            
            .container {
                max-width: 100%;
            }
            
            a {
                color: black !important;
                text-decoration: underline;
            }
        }

        /* ============ 自定义滚动条 ============ */
        ::-webkit-scrollbar {
            width: 10px;
            height: 10px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-secondary);
            border-radius: var(--radius-full);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--border-dark);
            border-radius: var(--radius-full);
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-tertiary);
        }

        /* ============ 快捷网站 ============ */
        .quick-sites {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-4);
            margin-top: var(--space-4);
        }
        
        .quick-site:hover {
            background: var(--bg-tertiary);
            border-radius: var(--radius-lg);
            transform: translateY(-2px);
        }
        
        /* ============ 应用中心 ============ */
        .app-center-container {
            padding: var(--space-4);
        }
        
        .app-categories {
            display: flex;
            gap: var(--space-2);
            margin-bottom: var(--space-6);
            flex-wrap: wrap;
        }
        
        .category-btn {
            padding: var(--space-2) var(--space-4);
            border: 1px solid var(--border-color);
            background: var(--bg-secondary);
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all var(--transition-fast);
            font-size: 0.9rem;
        }
        
        .category-btn:hover {
            background: var(--bg-tertiary);
            border-color: var(--primary-color);
        }
        
        .category-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .app-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: var(--space-4);
        }
        
        .app-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }
        
        .app-card:hover {
            background: var(--bg-tertiary);
            border-color: var(--primary-color);
            transform: translateY(-2px);
        }
        
        .app-card.locked {
            opacity: 0.7;
            cursor: not-allowed;
        }
        
        .app-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            position: relative;
            flex-shrink: 0;
        }
        
        .app-info h4 {
            margin: 0 0 var(--space-1) 0;
            color: var(--text-primary);
            font-size: 1rem;
        }
        
        .app-info p {
            margin: 0 0 var(--space-2) 0;
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        
        .app-level {
            font-size: 0.75rem;
            color: var(--text-tertiary);
            background: var(--bg-tertiary);
            padding: 2px 6px;
            border-radius: var(--radius-sm);
        }
        
        /* ============ 资源中心 ============ */
        .resource-center-container {
            padding: var(--space-4);
        }
        
        .resource-search {
            display: flex;
            gap: var(--space-2);
            margin-bottom: var(--space-6);
        }
        
        .resource-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--space-4);
            margin-bottom: var(--space-6);
        }
        
        .resource-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: var(--space-4);
        }
        
        .resource-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: var(--space-4);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        
        .resource-card:hover {
            background: var(--bg-tertiary);
            border-color: var(--primary-color);
            transform: translateY(-2px);
        }
        
        .resource-header {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            margin-bottom: var(--space-3);
        }
        
        .resource-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        
        .resource-info h3 {
            margin: 0 0 var(--space-1) 0;
            color: var(--text-primary);
            font-size: 1.1rem;
        }
        
        .resource-info p {
            margin: 0;
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        
        .resource-meta {
            display: flex;
            gap: var(--space-3);
            margin-top: var(--space-2);
        }
        
        .resource-count {
            font-size: 0.8rem;
            color: var(--primary-color);
            font-weight: 600;
        }
        
        .resource-level {
            font-size: 0.8rem;
            color: var(--success-color);
            font-weight: 600;
        }
        
        .resource-tags {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-2);
            margin-top: var(--space-3);
        }
        
        .tag {
            font-size: 0.75rem;
            background: var(--bg-tertiary);
            color: var(--text-secondary);
            padding: 2px 8px;
            border-radius: var(--radius-sm);
        }
        
        /* ============ 实用类 ============ */
        .text-center { text-align: center; }
        .text-left { text-align: left; }
        .text-right { text-align: right; }
        
        .text-primary { color: var(--text-primary); }
        .text-secondary { color: var(--text-secondary); }
        .text-tertiary { color: var(--text-tertiary); }
        
        .bg-primary { background: var(--bg-primary); }
        .bg-secondary { background: var(--bg-secondary); }
        .bg-tertiary { background: var(--bg-tertiary); }
        
        .shadow-xs { box-shadow: var(--shadow-xs); }
        .shadow-sm { box-shadow: var(--shadow-sm); }
        .shadow-md { box-shadow: var(--shadow-md); }
        .shadow-lg { box-shadow: var(--shadow-lg); }
        .shadow-xl { box-shadow: var(--shadow-xl); }
        .shadow-2xl { box-shadow: var(--shadow-2xl); }
        
        .rounded-sm { border-radius: var(--radius-sm); }
        .rounded-md { border-radius: var(--radius-md); }
        .rounded-lg { border-radius: var(--radius-lg); }
        .rounded-xl { border-radius: var(--radius-xl); }
        .rounded-full { border-radius: var(--radius-full); }
        
        .m-0 { margin: 0; }
        .m-2 { margin: var(--space-2); }
        .m-4 { margin: var(--space-4); }
        .m-6 { margin: var(--space-6); }
        
        .mt-2 { margin-top: var(--space-2); }
        .mt-4 { margin-top: var(--space-4); }
        .mt-6 { margin-top: var(--space-6); }
        .mt-8 { margin-top: var(--space-8); }
        
        .mb-2 { margin-bottom: var(--space-2); }
        .mb-4 { margin-bottom: var(--space-4); }
        .mb-6 { margin-bottom: var(--space-6); }
        .mb-8 { margin-bottom: var(--space-8); }
        
        .p-0 { padding: 0; }
        .p-2 { padding: var(--space-2); }
        .p-4 { padding: var(--space-4); }
        .p-6 { padding: var(--space-6); }
        
        .pt-2 { padding-top: var(--space-2); }
        .pt-4 { padding-top: var(--space-4); }
        .pt-6 { padding-top: var(--space-6); }
        
        .pb-2 { padding-bottom: var(--space-2); }
        .pb-4 { padding-bottom: var(--space-4); }
        .pb-6 { padding-bottom: var(--space-6); }
        
        .hidden { display: none !important; }
        .block { display: block !important; }
        .inline-block { display: inline-block !important; }
        .flex { display: flex !important; }
        .inline-flex { display: inline-flex !important; }
        .grid { display: grid !important; }
        
        .w-full { width: 100%; }
        .w-auto { width: auto; }
        .h-full { height: 100%; }
        .h-auto { height: auto; }
        
        .flex-1 { flex: 1; }
        .flex-auto { flex: 0 0 auto; }
        
        .items-start { align-items: flex-start; }
        .items-center { align-items: center; }
        .items-end { align-items: flex-end; }
        
        .justify-start { justify-content: flex-start; }
        .justify-center { justify-content: center; }
        .justify-end { justify-content: flex-end; }
        .justify-between { justify-content: space-between; }
        .justify-around { justify-content: space-around; }
        
        .cursor-pointer { cursor: pointer; }
        .cursor-default { cursor: default; }
        .cursor-not-allowed { cursor: not-allowed; }
        
        .select-none { user-select: none; }
        .select-text { user-select: text; }
        
        .transition-fast { transition: var(--transition-fast); }
        .transition-base { transition: var(--transition-base); }
        .transition-slow { transition: var(--transition-slow); }
        
        .z-0 { z-index: 0; }
        .z-10 { z-index: 10; }
        .z-20 { z-index: 20; }
        .z-30 { z-index: 30; }
        .z-40 { z-index: 40; }
        .z-50 { z-index: 50; }
        .z-auto { z-index: auto; }