/* 
 * 移动端适配与响应式样式
 */

/* 响应式设计 */
@media (max-width: 640px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    /* 邮件页操作按钮统一为正方形 */
    .flex.flex-wrap.gap-2>.btn {
        width: 44px;
        height: 44px;
        padding: 0;
        border-radius: var(--radius-md);
    }
}

/* ===== 移动端侧边栏适配 ===== */

/* 移动端触发按钮 - 默认隐藏 */
.mobile-sidebar-toggle {
    display: none;
    position: fixed;
    top: 18px;
    left: 14px;
    z-index: 999;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    color: var(--subtitle);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

.mobile-sidebar-toggle:hover {
    color: var(--primary);
    background: var(--secondary);
}

/* 遮罩层 - 默认隐藏 */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* 移动端媒体查询 */
@media (max-width: 768px) {

    /* 显示移动端触发按钮 */
    .mobile-sidebar-toggle {
        display: flex;
    }

    /* 侧边栏默认隐藏，改为固定定位悬浮 */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: 260px;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1000;
        box-shadow: none;
    }

    /* 侧边栏打开状态 */
    .sidebar.mobile-open {
        transform: translateX(0);
        box-shadow: 4px 0 30px rgba(0, 0, 0, 0.12);
    }

    /* 移动端不需要 collapsed 状态 */
    .sidebar.collapsed {
        width: 260px;
    }

    .sidebar.collapsed .logo {
        display: flex;
        opacity: 1;
    }

    .sidebar.collapsed .nav-text {
        opacity: 1;
        width: auto;
        margin-left: 0;
    }

    .sidebar.collapsed .nav-item {
        justify-content: flex-start;
        padding: 12px 16px;
        width: 100%;
        height: auto;
        margin: 0;
    }

    .sidebar.collapsed .nav-item i {
        margin-right: 12px;
    }

    .sidebar.collapsed .sidebar-header {
        justify-content: space-between;
        padding: 24px 20px;
    }

    .sidebar.collapsed .toggle-btn {
        margin: 0;
    }

    /* 主内容区在移动端占据全宽 */
    .main-content {
        width: 100%;
    }
}