:root {
            /* --primary-color: rgba(0, 102, 255, 0.45); */
            --border-radius: 15px;
            --box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
            --primary-color: rgba(234, 234, 234, 0.45);
            --secondary-color: rgba(255, 255, 255, 0);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #fff;
            line-height: 1.6;
            position: relative;
            min-height: 100vh;
            padding-bottom: 100px; /* 为footer留出空间 */
        }

        /* 背景图片容器 */
        .bg-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -2;
            background-image: url('../images/logBJ.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.7;
        }

        /* 背景遮罩 */
        .bg-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            z-index: -1;
        }

        /* 添加背景纹理 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
        }
        
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 2rem 1rem;
            text-align: center;
            box-shadow: var(--box-shadow);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
        }
        
        .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 1rem;
        }
        
        .controls {
            display: flex;
            justify-content: space-between;
            margin-bottom: 2rem;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        .search-box {
            flex: 1;
            min-width: 300px;
        }
        
        .search-box input {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--border-radius);
            font-size: 1rem;
            box-shadow: var(--box-shadow);
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
        }

        .search-box input:focus {
            outline: none;
            background: rgba(255, 255, 255, 0.25);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
        }

        .search-box input::placeholder {
            color: rgba(255, 255, 255, 0.7);
        }
        
        .filter-buttons {
            display: flex;
            gap: 0.5rem;
        }
        
        .filter-btn {
            padding: 0.5rem 1rem;
            background-color: rgba(255, 255, 255, 0.15);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: all 0.3s ease;
            color: #fff;
            backdrop-filter: blur(10px);
        }
        
        .filter-btn.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .filter-btn:hover:not(.active) {
            background-color: rgba(255, 255, 255, 0.25);
        }
        
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }
        
        .timeline::before {
            content: '';
            position: absolute;
            left: 30px;
            top: 0;
            bottom: 0;
            width: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        
        .update-card {
            background-color: rgba(255, 255, 255, 0.15);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            margin-bottom: 2rem;
            padding: 1.5rem;
            position: relative;
            transition: transform 0.3s ease;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .update-card:hover {
            transform: translateY(-5px);
            background-color: rgba(255, 255, 255, 0.25);
        }
        
        .update-card::before {
            content: '';
            position: absolute;
            left: -40px;
            top: 24px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 4px solid rgba(255, 255, 255, 0.9);
            box-shadow: 0 0 0 2px var(--primary-color);
        }
        
        .date {
            font-size: 1.1rem;
            font-weight: bold;
            color: #fff;
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
        }
        
        .date::before {
            content: '📋';
            margin-right: 8px;
        }
        
        .content {
            padding-left: 1rem;
            border-left: 3px solid var(--light-color);
            color: rgba(255, 255, 255, 0.9);
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
        }
        
        .highlight {
            color: var(--accent-color);
            font-weight: bold;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
        }
        
        .no-results {
            text-align: center;
            padding: 2rem;
            color: rgba(255, 255, 255, 0.8);
            background: rgba(255, 255, 255, 0.15);
            border-radius: var(--border-radius);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .loading {
            text-align: center;
            padding: 2rem;
            color: rgba(255, 255, 255, 0.9);
            background: rgba(255, 255, 255, 0.15);
            border-radius: var(--border-radius);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .footer {
            text-align: center;
            padding: 20px;
            margin-top: 40px;
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.9em;
            background: rgba(255, 255, 255, 0.15);
            border-radius: 20px;
            box-shadow:
                8px 8px 16px rgba(0, 0, 0, 0.1),
                -8px -8px 16px rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 40px);
            max-width: 1200px;
        }

        .footer p {
            margin: 5px 0;
        }

        .footer a {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .footer a:hover {
            color: #fff;
            text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
        }
        
        @media (max-width: 768px) {
            .timeline::before {
                left: 20px;
            }
            
            .update-card::before {
                left: -30px;
            }
            
            .controls {
                flex-direction: column;
            }
            
            .search-box {
                min-width: 100%;
            }
            
            .footer {
                padding: 15px;
                font-size: 0.8em;
                width: calc(100% - 20px);
            }
        }