/**
 * 导航组件样式
 * 桌面端：顶部标签导航
 * 移动端：底部 Tab Bar
 */

/* ==================== 桌面端 Header ==================== */
.page-header {
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    transition: background-color var(--transition-normal);
    border-bottom: 1px solid var(--border-color);
}

.page-header-content {
    height: var(--header-height);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.page-header-title {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    letter-spacing: var(--letter-spacing-tight);
    text-decoration: none;
    flex-shrink: 0;
}

.page-header-title:hover {
    color: var(--text-primary);
}

/* ==================== 桌面端导航标签 ==================== */
.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex: 1;
    justify-content: center;
}

.nav-tab {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
    letter-spacing: var(--letter-spacing-wide);
}

.nav-tab:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.nav-tab-active,
.nav-tab-active:hover {
    color: var(--color-primary);
    background-color: transparent;
}

.nav-tab-active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 16px;
    right: 16px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 1px;
}

/* 导航角标 */
.nav-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    color: #fff;
    background: var(--color-danger);
    border-radius: 9px;
    line-height: 1;
}

/* ==================== 右侧操作区 ==================== */
.page-header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
    margin-left: auto;
}

/* 用户头像链接 */
.nav-user {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.nav-user:hover {
    background-color: var(--bg-tertiary);
}

.nav-user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 14px;
    font-weight: var(--font-weight-bold);
    flex-shrink: 0;
}

.nav-user-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

/* 主题切换按钮 */
.theme-toggle {
    padding: 8px !important;
    min-width: 36px;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.theme-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ==================== 移动端底部 Tab Bar ==================== */
.mobile-tab-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    z-index: var(--z-header);
    padding: 0 4px;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

[data-theme="dark"] .mobile-tab-bar {
    background: rgba(17, 17, 20, 0.9);
}

.mobile-tab-item {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    text-decoration: none;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
    padding: 6px 0;
    -webkit-tap-highlight-color: transparent;
}

.mobile-tab-item:active {
    opacity: 0.7;
}

.mobile-tab-active,
.mobile-tab-active:active {
    color: var(--color-primary);
}

.mobile-tab-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
}

.mobile-tab-icon svg {
    width: 22px;
    height: 22px;
}

.mobile-tab-label {
    font-size: 10px;
    font-weight: var(--font-weight-medium);
    line-height: 1;
    letter-spacing: 0;
}

/* 移动端角标 */
.mobile-tab-badge {
    position: absolute;
    top: 2px;
    right: 50%;
    margin-right: -20px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    font-size: 9px;
    font-weight: var(--font-weight-bold);
    color: #fff;
    background: var(--color-danger);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

/* ==================== 移动端 Header 适配 ==================== */
@media (max-width: 768px) {
    .page-header {
        padding: 10px 16px !important;
    }

    .page-header-content {
        gap: 8px;
    }

    /* 隐藏桌面端导航 */
    .main-nav {
        display: none;
    }

    /* 显示移动端标题（如果 data-mobile-title 存在） */
    .page-header-title::after {
        content: attr(data-mobile-title);
        display: none;
    }

    .page-header-title {
        font-size: 18px !important;
        font-weight: 600;
        flex: 1;
        min-width: 0;
    }

    /* 隐藏桌面端用户名，只显示头像 */
    .nav-user-name {
        display: none;
    }

    .nav-user {
        padding: 4px;
    }

    /* 隐藏键盘快捷键按钮 */
    .page-header-actions .btn-ghost:first-child {
        display: none;
    }

    /* 显示底部 Tab Bar */
    .mobile-tab-bar {
        display: flex;
    }

    /* 页面主体为底部 Tab Bar 留出空间 */
    .page-main {
        padding-bottom: 70px;
    }
}

/* ==================== 桌面端隐藏 Tab Bar ==================== */
@media (min-width: 769px) {
    .mobile-tab-bar {
        display: none !important;
    }
}