:root {
            /* 浅色模式变量 */
            --md-surface: #FAFAFA;
            --md-on-surface: #1D1B20;
            --md-surface-variant: #FFFFFF;
            --md-on-surface-variant: #6B6B6B;
            --md-primary: #6750A4;
            --md-primary-hover: #58429B;
            --md-on-primary: #FFFFFF;
            --md-outline: #E0E0E0;
            --md-divider: #F0F0F0;
            --md-shadow: rgba(0,0,0,0.08);
            --md-icon: #6750A4;
            --md-secondary-icon: #9E9E9E;
            --md-ripple-light: rgba(0,0,0,0.1);
            --md-ripple-button: rgba(255,255,255,0.2);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background-color: var(--md-surface);
            color: var(--md-on-surface);
            line-height: 1.5;
            scroll-behavior: smooth;
            padding-bottom: env(safe-area-inset-bottom);
        }

        /* Header 样式 */
        .md-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background-color: var(--md-surface-variant);
            border-bottom: 1px solid var(--md-outline);
            display: flex;
            align-items: center;
            padding: 0 16px;
            z-index: 1000;
        }

        .md-header__back {
            width: 40px;
            height: 40px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .md-header__back::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: var(--md-ripple-light);
            transform: translate(-50%, -50%);
            transition: width 0.3s, height 0.3s;
        }

        .md-header__back:active::after {
            width: 100%;
            height: 100%;
        }

        .md-header__back svg {
            width: 24px;
            height: 24px;
            fill: var(--md-on-surface);
        }

        .md-header__title {
            flex: 1;
            text-align: center;
            font-size: 20px;
            font-weight: 500;
            color: var(--md-on-surface);
        }

        /* 内容区域 */
        .md-content {
            padding: 80px 16px 100px;
            max-width: 600px;
            margin: 0 auto;
        }

        /* 卡片样式 */
        .md-card {
            background: var(--md-surface-variant);
            border-radius: 16px;
            padding: 0;
            margin-bottom: 16px;
            box-shadow: 0 2px 8px var(--md-shadow);
            overflow: hidden;
        }

        /* 列表项样式 */
        .md-list-item {
            height: 56px;
            padding: 0 16px;
            display: flex;
            align-items: center;
            position: relative;
            text-decoration: none;
            color: inherit;
            border-bottom: 1px solid var(--md-divider);
            cursor: pointer;
            overflow: hidden;
        }

        .md-list-item:last-child {
            border-bottom: none;
        }

        .md-list-item::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: var(--md-ripple-light);
            transform: translate(-50%, -50%);
            transition: width 0.3s, height 0.3s;
        }

        .md-list-item:active::after {
            width: 100%;
            height: 100%;
        }

        .md-list-item--readonly {
            cursor: default;
        }

        .md-list-item--readonly::after {
            display: none;
        }

        .md-list-item__icon {
            width: 24px;
            height: 24px;
            margin-right: 16px;
            flex-shrink: 0;
        }

        .md-list-item__icon svg {
            width: 100%;
            height: 100%;
            fill: var(--md-icon);
        }

        .md-list-item__content {
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .md-list-item__title {
            font-size: 16px;
            font-weight: 500;
            color: var(--md-on-surface);
        }

        .md-list-item__subtitle {
            font-size: 14px;
            color: var(--md-on-surface-variant);
            margin-top: 2px;
        }

        .md-list-item__value {
            font-size: 14px;
            color: var(--md-on-surface-variant);
            margin-right: 8px;
        }

        .md-list-item__arrow {
            width: 24px;
            height: 24px;
            flex-shrink: 0;
            margin-left: 8px;
        }

        .md-list-item__arrow svg {
            width: 100%;
            height: 100%;
            fill: var(--md-secondary-icon);
        }

        /* 退出按钮 */
        .md-logout-btn {
            position: fixed;
            bottom: calc(16px + env(safe-area-inset-bottom));
            left: 16px;
            right: 16px;
            height: 56px;
            background: var(--md-primary);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--md-on-primary);
            font-size: 16px;
            font-weight: 500;
            text-decoration: none;
            cursor: pointer;
            overflow: hidden;
            max-width: 600px;
            margin: 0 auto;
        }

        .md-logout-btn:hover {
            background: var(--md-primary-hover);
        }

        .md-logout-btn::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: var(--md-ripple-button);
            transform: translate(-50%, -50%);
            transition: width 0.3s, height 0.3s;
        }

        .md-logout-btn:active::after {
            width: 100%;
            height: 100%;
        }

        .md-logout-btn__icon {
            width: 20px;
            height: 20px;
            margin-right: 8px;
        }

        .md-logout-btn__icon svg {
            width: 100%;
            height: 100%;
            fill: var(--md-on-primary);
        }

        /* 占位符 */
        .md-placeholder {
            height: 64px;
        }