/* 遮层样式 */
        .login-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            z-index: 10000;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .login-overlay.show {
            visibility: visible;
            opacity: 1;
        }

        /* 卡片容器 */
        .login-card {
            width: 85%;
            max-width: 360px;
            background: white;
            border-radius: 40px;
            padding: 32px 24px 28px;
            text-align: center;
            box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.2);
            transform: scale(0.9);
            transition: transform 0.25s ease;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        }
        .login-overlay.show .login-card {
            transform: scale(1);
        }

        /* 图标区域 */
        .login-icon {
            width: 70px;
            height: 70px;
            background: #eef2ff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 40px;
            color: #6c5ce7;
        }

        .login-title {
            font-size: 24px;
            font-weight: 800;
            color: #1e293b;
            margin-bottom: 12px;
        }

        .login-desc {
            font-size: 14px;
            color: #5b6e8c;
            line-height: 1.5;
            margin-bottom: 28px;
        }

        /* 按钮组 */
        .login-buttons {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .btn-login {
            background: #6c5ce7;
            border: none;
            border-radius: 60px;
            padding: 14px 0;
            font-weight: 700;
            font-size: 16px;
            color: white;
            cursor: pointer;
            transition: 0.2s;
            box-shadow: 0 4px 12px rgba(108,92,231,0.3);
        }
        .btn-login:active {
            transform: scale(0.97);
        }
        .btn-close {
            background: transparent;
            border: 1px solid #e2e8f0;
            border-radius: 60px;
            padding: 12px 0;
            font-weight: 500;
            font-size: 14px;
            color: #5b6e8c;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-close:active {
            transform: scale(0.97);
            background: #f8fafc;
        }

        /* 关闭图标（右上角）可选 */
        .close-icon {
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 24px;
            cursor: pointer;
            color: #94a3b8;
            background: transparent;
            border: none;
            padding: 8px;
            line-height: 1;
        }
        .close-icon:hover {
            color: #6c5ce7;
        }
        .login-card {
            position: relative;
        }