/* 自定义样式 */
        :root {
            --primary-color: #f1c40f;
            --secondary-color: #f39c12;
            --accent-color: #e67e22;
            --text-color: #333333;
            --bg-color: #f5f5f5;
            --card-bg: #ffffff;
        }
        
        body {
            font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
            color: var(--text-color);
            background-color: var(--bg-color);
            scroll-behavior: smooth;
        }
        
        .gradient-bg {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        }
        
        .card {
            background-color: var(--card-bg);
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        }
        
        .btn-primary {
            background-color: var(--accent-color);
            color: white;
            padding: 12px 24px;
            border-radius: 4px;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
        }
        
        .btn-primary:hover {
            background-color: #d35400;
            transform: translateY(-2px);
        }
        
        .btn-secondary {
            background-color: var(--primary-color);
            color: white;
            padding: 12px 24px;
            border-radius: 4px;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
        }
        
        .btn-secondary:hover {
            background-color: #f39c12;
            transform: translateY(-2px);
        }
        
        .btn-gray {
            background-color: #e0e0e0;
            color: #666666;
            padding: 12px 24px;
            border-radius: 4px;
            font-weight: bold;
            transition: background-color 0.3s ease, transform 0.3s ease;
        }
        
        .btn-gray:hover {
            background-color: #d0d0d0;
            transform: translateY(-2px);
        }
        
        .floating-btn {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: var(--accent-color);
            color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 24px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
            cursor: pointer;
            transition: transform 0.3s ease, background-color 0.3s ease;
            z-index: 1000;
        }
        
        .floating-btn:hover {
            transform: scale(1.1);
            background-color: #d35400;
        }
        
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 2000;
            justify-content: center;
            align-items: center;
        }
        
        .modal-content {
            background-color: white;
            padding: 30px;
            border-radius: 8px;
            text-align: center;
            max-width: 400px;
            width: 90%;
        }
        
        .feature-icon {
            font-size: 36px;
            color: var(--primary-color);
            margin-bottom: 16px;
        }
        
        .step-number {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            font-weight: bold;
            margin-bottom: 16px;
        }
        
        .faq-item {
            border-bottom: 1px solid #e0e0e0;
            padding: 16px 0;
        }
        
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: bold;
        }
        
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .faq-answer.active {
            max-height: 500px;
            margin-top: 16px;
        }
        
        .star-rating {
            color: #f1c40f;
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .desktop-menu {
                display: none;
            }
            
            .mobile-menu {
                display: block;
            }
            
            .hero-content {
                text-align: center;
            }
            
            .floating-btn {
                width: 50px;
                height: 50px;
                font-size: 20px;
                bottom: 20px;
                right: 20px;
            }
        }
        
        @media (min-width: 769px) {
            .desktop-menu {
                display: flex;
            }
            
            .mobile-menu {
                display: none;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .animate-fade-in {
            animation: fadeIn 0.8s ease forwards;
        }
        
        .delay-100 { animation-delay: 0.1s; }
        .delay-200 { animation-delay: 0.2s; }
        .delay-300 { animation-delay: 0.3s; }
        .delay-400 { animation-delay: 0.4s; }
        .delay-500 { animation-delay: 0.5s; }
        
        /* 特殊效果 */
        .color-transition {
            transition: background-color 2s ease;
        }
        
        .warm-gradient {
            background: linear-gradient(135deg, #f1c40f, #e67e22);
        }
        
        .cool-gradient {
            background: linear-gradient(135deg, #3498db, #2980b9);
        }
        
        .day-night-demo {
            height: 200px;
            border-radius: 8px;
            transition: background-color 2s ease;
            position: relative;
            overflow: hidden;
        }
        
        .day-mode {
            background: linear-gradient(to bottom, #3498db, #87ceeb);
        }
        
        .night-mode {
            background: linear-gradient(to bottom, #2c3e50, #34495e);
        }
        
        .sun {
            position: absolute;
            top: 30px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: #f1c40f;
            box-shadow: 0 0 30px #f1c40f;
            transition: all 2s ease;
        }
        
        .moon {
            position: absolute;
            top: 30px;
            left: 50%;
            transform: translateX(-50%);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: #bdc3c7;
            box-shadow: 0 0 20px #bdc3c7;
            opacity: 0;
            transition: all 2s ease;
        }
        
        .stars {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
            transition: opacity 2s ease;
        }
        
        .star {
            position: absolute;
            background-color: white;
            border-radius: 50%;
        }
        
        .star-1 {
            width: 2px;
            height: 2px;
            top: 20%;
            left: 20%;
        }
        
        .star-2 {
            width: 3px;
            height: 3px;
            top: 30%;
            left: 70%;
        }
        
        .star-3 {
            width: 2px;
            height: 2px;
            top: 50%;
            left: 40%;
        }
        
        .star-4 {
            width: 1px;
            height: 1px;
            top: 60%;
            left: 80%;
        }
        
        .star-5 {
            width: 2px;
            height: 2px;
            top: 70%;
            left: 30%;
        }
        
        .day-night-demo.night-mode .sun {
            opacity: 0;
            transform: translateX(-50%) translateY(100px);
        }
        
        .day-night-demo.night-mode .moon {
            opacity: 1;
        }
        
        .day-night-demo.night-mode .stars {
            opacity: 1;
        }