/* 
 * 布局框架 - 侧边栏、主内容区、头部
 */

/* 布局框架 */
.app-container {
    display: flex;
    height: 100vh;
    width: 100%;
    overflow-x: hidden;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 1px 0 15px rgba(0, 0, 0, 0.03);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 40;
    overflow: hidden;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar.collapsed .logo {
    display: none;
}

.sidebar.collapsed .nav-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
    margin-left: 0;
}

.sidebar-header {
    padding: 24px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    white-space: nowrap;
    transition: opacity 0.1s ease;
    transition-delay: 0.15s;
}

.logo i {
    font-size: 28px;
    color: var(--primary);
}

.logo h1 {
    font-size: 16px;
    font-weight: 700;
    color: var(--title);
    line-height: 1.2;
}

.logo p {
    font-size: 11px;
    color: var(--subtitle);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toggle-btn {
    background: transparent;
    border: none;
    color: var(--subtitle);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

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

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 0;
    width: 44px;
    height: 44px;
    margin: 0 auto;
    border-radius: var(--radius-md);
}

.sidebar.collapsed .sidebar-header {
    justify-content: center;
    padding: 16px 0;
}

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

.sidebar-nav {
    flex: 1;
    padding: 20px 12px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-divider {
    height: 1px;
    background: var(--border-color);
    margin: 12px 8px;
    opacity: 0.5;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--subtitle);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    text-align: left;
    white-space: nowrap;
}

.nav-text {
    transition: opacity 0.1s ease;
    transition-delay: 0.15s;
}

.sidebar.collapsed .nav-text {
    transition-delay: 0s;
}

.nav-item i {
    font-size: 20px;
    margin-right: 12px;
    transition: var(--transition);
}

.sidebar.collapsed .nav-item i {
    margin-right: 0;
}

.nav-item:hover {
    background: rgba(241, 245, 249, 0.6);
    color: var(--primary);
}

.nav-item.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.nav-item.active i {
    color: white;
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.main-header {
    height: 80px;
    padding: 0 12px 0 84px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: transparent;
}

@media (min-width: 768px) {
    .main-header {
        padding: 0 32px;
    }
}

.main-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--title);
    letter-spacing: -0.5px;
}

@media (min-width: 768px) {
    .main-header h2 {
        font-size: 22px;
    }
}

.main-body {
    flex: 1;
    padding: 0 12px 16px 12px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

@media (min-width: 768px) {
    .main-body {
        padding: 0 32px 32px 32px;
    }
}

/* 内容主体区域 */
.content-body {
    flex: 1;
    padding: 0 32px 32px 32px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

/* 头部操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-profile {
    display: flex;
    align-items: center;
}

/* 页面切换 */
.page {
    display: none;
}

.page.active {
    display: block;
}