/**
 * 文件路径: /home/ubuntu/talktalk_backend/public/css/layout.css
 * 功能用途: 页面整体布局
 * 版本: v3.1
 * 描述: Discord/GitHub风格，卡片式布局
 * 修改: 修复侧边栏折叠和滚动问题
 */

#app {
    display: flex;
    flex-direction: column;
    height: 100%; /* Fallback */
    height: 100dvh; /* Modern mobile browsers */
    width: 100%;
    overflow: hidden; /* Prevent body scroll */
    position: fixed; /* Fix app container to viewport */
    top: 0;
    left: 0;
}

.page {
    display: none !important; /* Enforce hidden state */
    width: 100%;
    height: 100%;
    flex-direction: column;
}

.page.active {
    display: flex !important; /* Enforce visible state */
}

/* Header 顶部导航 */
.app-header {
    height: var(--header-height);
    background-color: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-lg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 100;
    flex-shrink: 0;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-center h2 {
    color: var(--primary-color);
    font-size: 24px;
    text-shadow: 1px 1px 0 var(--bg-secondary);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-round);
    font-weight: bold;
    color: var(--text-primary);
}

.avatar-circle {
    width: 32px;
    height: 32px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

/* 主容器：侧边栏 + 内容区 */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 90;
    border-right: 2px solid rgba(0,0,0,0.05);
    flex-shrink: 0; /* 防止被挤压 */
}

/* 侧边栏折叠状态 (桌面端) */
.sidebar.collapsed {
    margin-left: calc(var(--sidebar-width) * -1);
}

.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar h3 {
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 8px;
    padding-left: 8px;
}

.sidebar-divider {
    height: 2px;
    background-color: rgba(0,0,0,0.05);
    border-radius: 2px;
    margin: var(--spacing-xs) 0;
}

/* 侧边栏按钮样式在 buttons.css 定义 */

/* 内容区域 */
.main-content {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: transparent; /* 让背景装饰透出来 */
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
}

.content-panel {
    display: none; /* 默认隐藏所有面板 */
    width: 100%;
    height: 100%;
    max-width: 1000px; /* 限制最大宽度，防止太宽难看 */
    margin: 0 auto;
    flex-direction: column;
}

.content-panel.active {
    display: flex;
}

/* 卡片容器 */
.panel-card {
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-y: auto; /* 允许垂直滚动 */
    overflow-x: hidden;
    border: 2px solid rgba(0,0,0,0.03);
}

[data-theme="dark"] .panel-card {
    background-color: rgba(55, 71, 79, 0.7);
}

.panel-card h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 当前会话条 (移动端或折叠时显示) */
.current-session-bar {
    background-color: var(--primary-color);
    color: #fff;
    padding: 10px var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 10px rgba(255, 138, 101, 0.3);
    flex-shrink: 0;
}

.session-bar-content {
    font-family: var(--font-heading);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 移动端侧边栏遮罩 */
.sidebar-overlay {
    display: none;
}

/* 响应式调整在 responsive.css */

/* 侧边栏二级菜单 */
.sidebar-submenu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-top: 5px;
    margin-left: 15px;
    padding-left: 10px;
    border-left: 2px solid rgba(0, 0, 0, 0.1);
    max-height: 300px;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.sidebar-submenu.hidden {
    display: none;
}

.submenu-item {
    padding: 8px 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    color: var(--text-secondary);
    transition: background-color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: 8px;
}

.submenu-item:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--primary-color);
}

.submenu-item.active {
    background-color: var(--primary-color-light);
    color: var(--primary-color);
    font-weight: bold;
}

.submenu-loading {
    padding: 10px;
    color: var(--text-secondary);
    font-size: 0.8em;
    text-align: center;
}

/* 箭头旋转 */
.submenu-arrow {
    transition: transform 0.3s ease;
}

.submenu-arrow.rotate {
    transform: rotate(180deg);
}

/* 滚动条美化 */
.sidebar-submenu::-webkit-scrollbar {
    width: 4px;
}
.sidebar-submenu::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar-submenu::-webkit-scrollbar-thumb {
    background: rgba(0,0,0,0.1);
    border-radius: 2px;
}

/* View All Link */
.submenu-view-all {
    font-size: 0.8em;
    color: var(--primary-color);
    text-align: center;
    padding: 5px;
    cursor: pointer;
    margin-top: 5px;
    border-top: 1px dashed rgba(0,0,0,0.1);
}