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

        body {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(145deg, #f6f9fc 0%, #e9f0f5 100%);
            padding: 20px;
        }

        /* ===== 登录卡片 ===== */
        .login-box {
            width: 100%;
            max-width: 480px;
            background: rgba(255, 255, 255, 0.75);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: 40px;
            padding: 40px 36px 44px;
            box-shadow: 0 30px 60px rgba(0, 20, 40, 0.08), 0 12px 30px rgba(0, 0, 0, 0.04), inset 0 1px 1px rgba(255, 255, 255, 0.6);
            border: 1px solid rgba(255, 255, 255, 0.5);
            transition: transform 0.25s ease, box-shadow 0.3s ease;
            position: relative;
            z-index: 1;
        }

        .header-wrap {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 32px;
        }

        .title {
            font-size: 32px;
            font-weight: 600;
            color: #1a2b48;
        }

        .tab-switch {
            display: flex;
            background: #f2f5fa;
            border-radius: 30px;
            padding: 4px;
        }

        .tab-item {
            padding: 8px 20px;
            border-radius: 30px;
            cursor: pointer;
            font-size: 15px;
            color: #666;
            transition: all 0.2s;
            user-select: none;
        }

        .tab-item.active {
            background: #fff;
            color: #1a2b48;
            font-weight: 500;
        }

        .form-item {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            font-size: 14px;
            color: #444;
            margin-bottom: 8px;
        }

        .input-wrap {
            position: relative;
        }

        .input-wrap input {
            width: 100%;
            height: 48px;
            padding: 0 16px 0 44px;
            border: 1px solid #e4e9f2;
            border-radius: 12px;
            font-size: 15px;
            outline: none;
            transition: border 0.2s;
            background: #fff;
        }

        .input-wrap input:focus {
            border-color: #234070;
        }

        .input-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: #999;
            font-size: 18px;
            pointer-events: none;
        }

        /* ===== 记住我 - Radio 样式 ===== */
        .remember-wrap {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 28px;
            padding: 6px 0 4px 0;
            margin-bottom: 6px;
        }

        .remember-wrap label {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: #444;
            cursor: pointer;
            user-select: none;
        }

        .remember-wrap input[type="radio"] {
            width: 16px;
            height: 16px;
            accent-color: #1a2b48;
            cursor: pointer;
            flex-shrink: 0;
        }

        .submit-btn {
            width: 100%;
            height: 56px;
            background: linear-gradient(90deg, #0f203a, #203b66);
            color: #fff;
            border: none;
            border-radius: 99px;
            font-size: 17px;
            font-weight: 500;
            cursor: pointer;
            margin-top: 10px;
            transition: opacity 0.25s, transform 0.15s, background 0.3s;
            position: relative;
        }

        .submit-btn:hover:not(:disabled) {
            opacity: 0.92;
        }

        .submit-btn:active:not(:disabled) {
            transform: scale(0.97);
        }

        .submit-btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none;
            background: #3d4f6b;
        }

        .link-wrap {
            display: flex;
            justify-content: space-between;
            margin-top: 24px;
            font-size: 14px;
        }

        .link-wrap a {
            color: #556b92;
            text-decoration: none;
            cursor: pointer;
            transition: color 0.2s;
        }

        .link-wrap a:hover {
            text-decoration: underline;
            color: #1a2b48;
        }

        .register-form {
            display: none;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 520px) {
            .login-box {
                padding: 28px 20px 32px;
                border-radius: 28px;
            }
            .title {
                font-size: 26px;
            }
            .tab-item {
                padding: 6px 14px;
                font-size: 14px;
            }
            .submit-btn {
                height: 50px;
                font-size: 16px;
            }
            .remember-wrap {
                gap: 18px;
                flex-wrap: wrap;
            }
        }

        @media (max-width: 400px) {
            .login-box {
                padding: 20px 14px 24px;
            }
            .title {
                font-size: 22px;
            }
            .header-wrap {
                flex-wrap: wrap;
                gap: 12px;
            }
            .tab-switch {
                margin-left: auto;
            }
            .remember-wrap {
                gap: 12px;
            }
        }