/* MD3 设计系统变量 */
        :root {
            --md-primary: #6750A4;
            --md-on-primary: #FFFFFF;
            --md-surface: #FFFFFF;
            --md-on-surface: #1C1B1F;
            --md-outline: #79747E;
            --md-error: #B3261E;
            --md-shadow-1: 0px 1px 2px 0px #0000000F;
            --md-shadow-2: 0px 1px 3px 1px #00000014;
            --md-shadow-4: 0px 2px 6px 2px #00000014;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: #F8F8F8;
            color: var(--md-on-surface);
            line-height: 1.4;
        }

        /* 顶部导航栏 - MD3风格 */
        .header {
            background-color: var(--md-surface);
            box-shadow: 0 1px 0 0 #00000014;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 56px;
            display: flex;
            align-items: center;
            padding: 0 16px;
        }

        .header-hd {
            flex: 0 0 auto;
            display: flex;
            align-items: center;
        }

        .header-btn {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 20px;
            transition: background-color 0.2s;
        }

        .header-btn:hover {
            background-color: #0000000F;
        }

        .uni-btn-icon {
            color: var(--md-primary);
            font-size: 24px;
        }

        .header-bd {
            flex: 1;
            text-align: center;
        }

        .header__title {
            font-size: 18px;
            font-weight: 500;
            color: var(--md-on-surface);
        }

        .uni-placeholder {
            height: 56px;
        }

        /* 主容器 */
        .container {
            padding: 16px;
            max-width: 600px;
            margin: 0 auto;
            padding-bottom: 80px; /* 为底部按钮留出空间 */
        }

        /* 支付方式卡片 - MD3风格 */
        .list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .item {
            background-color: var(--md-surface);
            border-radius: 8px;
            padding: 16px;
            box-shadow: var(--md-shadow-1);
            transition: box-shadow 0.2s ease;
            display: flex;
            align-items: flex-start;
            position: relative;
        }

        .item:hover {
            box-shadow: var(--md-shadow-2);
        }

        .icon {
            width: 40px;
            height: 40px;
            border-radius: 20px;
            background: linear-gradient(135deg, var(--md-primary), #8B75C9);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 16px;
            flex-shrink: 0;
            text-decoration: none;
        }

        .icon div {
            width: 24px;
            height: 24px;
            background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M20 4H4c-1.11 0-1.99.89-1.99 2L2 18c0 1.11.89 2 2 2h16c1.11 0 2-.89 2-2V6c0-1.11-.89-2-2-2zm0 14H4v-6h16v6zm0-10H4V6h16v2z"/></svg>');
            background-size: contain;
            background-repeat: no-repeat;
        }

        .card-content {
            flex: 1;
            min-width: 0;
        }

        .text {
            font-size: 16px;
            font-weight: 500;
            color: var(--md-on-surface);
            margin-bottom: 4px;
        }

        .account-info {
            font-size: 14px;
            color: #49454F;
            line-height: 1.5;
        }

        .account-info div {
            margin-bottom: 2px;
        }

        /* 操作区域 */
        .actions {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-left: 16px;
        }

        /* MD3 单选按钮 */
        .md-radio {
            width: 20px;
            height: 20px;
            border: 2px solid #9E9E9E;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
            flex-shrink: 0;
        }

        .md-radio.checked {
            border-color: var(--md-primary);
        }

        .md-radio.checked::after {
            content: '';
            width: 10px;
            height: 10px;
            background-color: var(--md-primary);
            border-radius: 50%;
        }

        /* 删除按钮 */
        .delete-btn {
            width: 40px;
            height: 40px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background-color 0.2s;
            color: #9E9E9E;
        }

        .delete-btn:hover {
            background-color: #0000000F;
            color: var(--md-error);
        }

        .delete-btn::before {
            content: '🗑️';
            font-size: 18px;
        }

        /* 底部新增按钮 - 改为文字按钮 */
        .add-button-container {
            position: fixed;
            bottom: 24px;
            left: 16px;
            right: 16px;
            z-index: 100;
            max-width: 600px;
            margin: 0 auto;
        }

        .add-button {
            display: block;
            width: 100%;
            background-color: var(--md-primary);
            color: var(--md-on-primary);
            border: none;
            border-radius: 20px;
            padding: 12px 24px;
            font-size: 16px;
            font-weight: 500;
            text-align: center;
            text-decoration: none;
            box-shadow: var(--md-shadow-2);
            transition: all 0.2s ease;
            cursor: pointer;
        }

        .add-button:hover {
            background-color: #7B61C7;
            box-shadow: var(--md-shadow-4);
        }

        /* 空状态 */
        .empty-state {
            text-align: center;
            padding: 48px 24px;
            color: var(--md-outline);
        }

        .empty-state::before {
            content: '💳';
            font-size: 48px;
            display: block;
            margin-bottom: 16px;
        }