/* ================= 基础变量与重置 ================= */
        :root {
            --primary-color: #E24A3A; /* 温暖的暗红，类似Pho的视觉元素 */
            --secondary-color: #F8B400; /* 暖黄色点缀 */
            --bg-color: #FFFDF9; /* 柔和的米白色背景，不刺眼 */
            --text-dark: #2C2C2C;
            --text-light: #666666;
            --white: #FFFFFF;
            --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--bg-color);
            color: var(--text-dark);
            line-height: 1.6;
        }

        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }

        /* ================= 导航栏 ================= */
        header {
            background-color: var(--white);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a:hover { color: var(--primary-color); }

        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 1.5rem;
        }
		
		/* ================= BannerVedio区域 ================= */
		.banner_vedio {
			display: grid;
			place-items: center; /* 居中视频 */
			width: 100%;          /* 容器宽度为100% */
			height: 100%;        /* 容器高度为视口高度的100% */
		}

        /* ================= 主视觉 Hero 区域 ================= */
        .hero {
            max-width: 1200px;
            margin: 4rem auto;
            padding: 0 2rem;
            display: flex;
            align-items: center;
            gap: 4rem;
        }

        .hero-content { flex: 1; }
        .hero-content h1 {
            font-size: 3rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .hero-content h1 span { color: var(--primary-color); }
        .hero-content p {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 2rem;
        }

        .btn {
            display: inline-block;
            padding: 0.8rem 2rem;
            background-color: var(--primary-color);
            color: var(--white);
            border-radius: 5px;
            font-weight: 600;
            transition: background 0.3s;
        }
        .btn:hover { background-color: #c0392b; }

        .hero-image {
            flex: 1;
            text-align: center;
        }
        .hero-image img {
            width: 100%;
            max-width: 450px;
            border-radius: 20px;
            box-shadow: 15px 15px 0px var(--secondary-color);
        }

        /* ================= 内容卡片区 (视频/产品) ================= */
        .features {
            background-color: var(--white);
            padding: 5rem 2rem;
        }

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 3rem;
        }

        .cards-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }

        .card {
            background: var(--bg-color);
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            transition: transform 0.3s;
            border: 1px solid #eee;
        }
        .card:hover { transform: translateY(-10px); }
        .card h3 { margin: 1rem 0; color: var(--primary-color); }

        /* ================= 底部 Footer ================= */
        footer {
            background-color: var(--text-dark);
            color: var(--white);
            text-align: center;
            padding: 3rem 2rem;
        }
        
        .social-links {
            margin: 1.5rem 0;
            display: flex;
            justify-content: center;
            gap: 1.5rem;
        }
        
        .social-links a { color: var(--secondary-color); font-weight: bold; }

        /* ================= 响应式设计 (移动端) ================= */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: var(--white);
                padding: 1rem 0;
                box-shadow: 0 5px 10px rgba(0,0,0,0.1);
            }
            .nav-links.active { display: flex; align-items: center; }
            .hamburger { display: block; }
            
            .hero {
                flex-direction: column-reverse;
                text-align: center;
                margin: 2rem auto;
            }
            .hero-image img { box-shadow: 10px 10px 0px var(--secondary-color); }
        }