* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", sans-serif;
        }
        /* ===== 全屏视频背景层 ===== */
        .bg-wrap{
            position: fixed;
            top:0;
            left:0;
            width:100%;
            height:100%;
            z-index:-1;
            overflow:hidden;
        }
        .bg-video{
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            min-width:100%;
            min-height:100%;
            object-fit: cover;
        }
        .bg-mask{
            position:absolute;
            width:100%;
            height:100%;
            background: rgba(0,0,0,0.25);
        }

        /* ===== 顶部导航 ===== */
        header{
            display:flex;
            justify-content: space-between;
            align-items:center;
            padding:24px 40px;
            color:#fff;
            z-index:2;
            position:relative;
        }
        .logo{
            font-size:24px;
            color:#40bfff;
            font-weight:bold;
        }
        .nav-menu a{
            color:#fff;
            text-decoration:none;
            margin-left:20px;
            font-size:16px;
        }
        .nav-menu a:hover{
            text-decoration:underline;
        }

        /* ===== 头部banner标题区域 ===== */
        .banner-title{
            text-align:center;
            padding:60px 20px;
            color:#fff;
            position:relative;
            z-index:2;
        }
        .banner-title h1{
            font-size:44px;
            margin-bottom:16px;
        }
        .banner-title p{
            font-size:17px;
            opacity:0.85;
        }

        /* ===== 主体双卡片容器（和截图布局一致，左右两卡片） ===== */
        .container{
            max-width:900px;
            margin:0 auto;
            display:grid;
            grid-template-columns: 1fr 1fr;
            gap:30px;
            padding:0 20px 60px;
            position:relative;
            z-index:2;
        }
        /* 磨砂卡片通用样式 */
        .glass-card{
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(14px);
            border:1px solid rgba(255,255,255,0.3);
            border-radius:14px;
            padding:30px;
            color:#fff;
        }
        .glass-card h2{
            font-size:24px;
            margin-bottom:24px;
        }

        /* ===== 发送消息表单 ===== */
        .form-item{
            margin-bottom:16px;
        }
        .form-item input, .form-item textarea{
            width:100%;
            padding:12px 14px;
            background:rgba(255,255,255,0.12);
            border:1px solid rgba(255,255,255,0.25);
            border-radius:10px;
            color:#fff;
            outline:none;
            font-size:15px;
        }
        .form-item input::placeholder, .form-item textarea::placeholder{
            color:rgba(255,255,255,0.6);
        }
        .form-item textarea{
            min-height:140px;
            resize:none;
        }
        .submit-btn{
            width:100%;
            padding:12px;
            border:none;
            border-radius:10px;
            background: rgba(92, 116, 240,0.65);
            backdrop-filter: blur(8px);
            color:#fff;
            font-size:16px;
            cursor:pointer;
            transition:0.3s;
        }
        .submit-btn:hover{
            background: rgba(92, 116, 240,0.85);
        }

        /* ===== 联系方式卡片 ===== */
        .contact-line{
            margin-bottom:14px;
            font-size:15px;
        }
        .social-tag-group{
            margin-top:20px;
            display:flex;
            gap:10px;
        }
        .social-tag{
            padding:6px 12px;
            background:rgba(255,255,255,0.12);
            border:1px solid rgba(255,255,255,0.25);
            border-radius:8px;
            font-size:14px;
        }

        /* 右侧悬浮小按钮（截图右上角两个圆形按钮） */
        .float-side-btn{
            position:fixed;
            right:24px;
            top:120px;
            display:flex;
            flex-direction:column;
            gap:12px;
            z-index:99;
        }
        .float-circle-btn{
            width:40px;
            height:40px;
            border-radius:50%;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(12px);
            border:1px solid rgba(255,255,255,0.3);
            color:#fff;
            display:flex;
            align-items:center;
            justify-content:center;
            cursor:pointer;
        }
        .float-avatar{
            position:fixed;
            right:16px;
            top:260px;
            width:60px;
            height:60px;
            border-radius:50%;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(12px);
            border:1px solid rgba(255,255,255,0.3);
            z-index:99;
        }