* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", sans-serif;
        }

        /* ========== 全屏视频背景（和首页一致） ========== */
        .banner {
            width: 100%;
            height: 100vh;
            position: relative;
            overflow: hidden;
        }
        .bg-video {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            min-width: 100%;
            min-height: 100%;
            z-index: 1;
            object-fit: cover;
        }
        .banner-mask {
            position: absolute;
            width:100%;
            height:100%;
            background: rgba(0,0,0,0.25);
            z-index: 2;
        }

        /* ========== 顶部导航栏 ========== */
        .nav-bar {
            position: absolute;
            top:0;
            width:100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            color: #ffffff;
            z-index: 3;
        }
        .back-index-btn {
            background-color: #5c74f0;
            padding: 7px 14px;
            border-radius: 14px;
            text-decoration: none;
            color: #fff;
            font-size: 14px;
        }
        .nav-right a {
            color: #fff;
            text-decoration: none;
            margin-left: 16px;
            font-size: 15px;
            cursor: pointer;
        }
        .nav-right a:hover {
            text-decoration: underline;
        }

        /* ========== 居中磨砂登录卡片核心 ========== */
        .login-wrap{
            position:absolute;
            top:50%;
            left:50%;
            transform:translate(-50%,-50%);
            z-index:3;
            width:400px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(14px);
            border:1px solid rgba(255,255,255,0.3);
            border-radius:20px;
            padding:36px 32px;
            color:#fff;
        }
        .login-wrap h2{
            text-align:center;
            font-size:28px;
            margin-bottom:28px;
        }
        .input-item{
            margin-bottom:20px;
        }
        .input-item label{
            display:block;
            margin-bottom:8px;
            font-size:15px;
            opacity:0.9;
        }
        .input-item input{
            width:100%;
            height:46px;
            padding:0 16px;
            background:rgba(255,255,255,0.12);
            border:1px solid rgba(255,255,255,0.25);
            border-radius:12px;
            color:#fff;
            outline:none;
            font-size:16px;
        }
        .input-item input::placeholder{
            color:rgba(255,255,255,0.6);
        }
        /* 密码行：忘记密码靠右 */
        .pwd-row{
            display:flex;
            justify-content:space-between;
            align-items:center;
        }
        .forget-pwd{
            font-size:14px;
            color:#c7d3ff;
            text-decoration:none;
        }
        .forget-pwd:hover{
            text-decoration:underline;
        }
        .login-submit{
            width:100%;
            height:48px;
            border:none;
            border-radius:12px;
            background: rgba(92, 116, 240,0.65);
            backdrop-filter: blur(8px);
            color:#fff;
            font-size:17px;
            cursor:pointer;
            transition:0.3s;
            margin-top:8px;
        }
        .login-submit:hover{
            background: rgba(92, 116, 240,0.85);
        }
        .login-tip{
            text-align:center;
            margin-top:20px;
            font-size:14px;
            opacity:0.8;
        }
        .login-tip a{
            color:#c7d3ff;
            text-decoration:none;
        }
        .login-tip a:hover{
            text-decoration:underline;