* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        :root {
            --primary: #0a0e17;
            --secondary: #131a2e;
            --accent-blue: #2563eb;
            --accent-purple: #7c3aed;
            --accent-cyan: #06b6d4;
            --text-primary: #e2e8f0;
            --text-secondary: #94a3b8;
        }
        
        body {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: var(--text-primary);
            min-height: 100vh;
            padding: 20px;
            background-attachment: fixed;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        header {
            text-align: center;
            margin-bottom: 40px;
            padding: 30px 20px;
            background: rgba(10, 14, 23, 0.8);
            border-radius: 16px;
            border: 1px solid rgba(37, 99, 235, 0.2);
            box-shadow: 0 0 40px rgba(37, 99, 235, 0.2);
            position: relative;
            overflow: hidden;
        }
        
        header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
            box-shadow: 0 0 10px var(--accent-blue);
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 15px rgba(6, 182, 212, 0.5);
        }
        
        .description {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        
        .category-tabs {
            display: flex;
            justify-content: center;
            margin-bottom: 40px;
            gap: 20px;
        }
        
        .tab {
            padding: 14px 35px;
            font-size: 1.1rem;
            background: rgba(19, 26, 46, 0.7);
            border: 1px solid rgba(37, 99, 235, 0.3);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all 0.3s ease;
            border-radius: 8px;
            font-weight: 600;
            position: relative;
            overflow: hidden;
        }
        
        .tab.active {
            background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
            color: white;
            box-shadow: 0 0 20px rgba(37, 99, 235, 0.4);
            border: 1px solid rgba(37, 99, 235, 0.5);
        }
        
        .tab:hover:not(.active) {
            background: rgba(37, 99, 235, 0.2);
            color: var(--text-primary);
        }
        
        .category {
            display: none;
            animation: fadeIn 0.5s ease;
        }
        
        .category.active {
            display: block;
        }
        
        .boxes-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
            margin-bottom: 50px;
        }
        
        .box-card {
            background: linear-gradient(145deg, rgba(19, 26, 46, 0.8), rgba(10, 14, 23, 0.8));
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            border: 1px solid rgba(37, 99, 235, 0.2);
            position: relative;
        }
        
        .box-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(130deg, rgba(37, 99, 235, 0.1), transparent);
            z-index: 1;
            pointer-events: none;
        }
        
        .box-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4), 0 0 15px rgba(37, 99, 235, 0.3);
            border: 1px solid rgba(37, 99, 235, 0.4);
        }
        
        .box-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-bottom: 1px solid rgba(37, 99, 235, 0.2);
        }
        
        .box-info {
            padding: 18px;
            position: relative;
            z-index: 2;
        }
        
        .box-name {
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        
        .box-time {
            color: var(--accent-cyan);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .countdown {
            font-weight: 600;
            color: #f87171;
        }
        
        footer {
            text-align: center;
            margin-top: 50px;
            padding: 25px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            border-top: 1px solid rgba(37, 99, 235, 0.2);
        }
        
        /* 科技感元素 */
        .tech-globe {
            position: absolute;
            width: 250px;
            height: 250px;
            right: -50px;
            top: -50px;
            opacity: 0.1;
            background: radial-gradient(circle, var(--accent-cyan) 0%, transparent 70%);
            border-radius: 50%;
            filter: blur(20px);
            z-index: 0;
        }
        
        .grid-lines {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            background-image: 
                linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
            background-size: 20px 20px;
            z-index: -1;
        }
        
        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .boxes-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            .boxes-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            h1 {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 480px) {
            .boxes-grid {
                grid-template-columns: 1fr;
            }
            
            .category-tabs {
                flex-direction: column;
                align-items: center;
            }
            
            .tab {
                width: 80%;
                margin-bottom: 10px;
            }
            
            h1 {
                font-size: 1.8rem;
            }
        }