/* ========================================
   Theme & Layout - 浅色主题与基础布局
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors - Primary */
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Colors - Semantic */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Colors - Background */
    --bg-primary: #f1f5f9;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    --bg-hover: #f1f5f9;
    
    /* Colors - Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;
    
    /* Colors - Border */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 0px;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
}

/* Layout Wrapper */
.wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar - Light Theme */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1), width var(--transition-normal);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow-x: hidden;
    /* 桌面端固定侧边栏，使其跟随页面滚动 */
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

/* 桌面端收起侧边栏 */
.sidebar.sidebar-collapsed {
    width: 0 !important;
    min-width: 0 !important;
    border-right: none !important;
    overflow: hidden !important;
}

/* 桌面端收起时内容区域扩展 */
.content.sidebar-collapsed {
    flex: 1 !important;
    width: 100% !important;
    max-width: 100% !important;
}

/* 移动端侧边栏 - 始终隐藏 */
@media (max-width: 991px) {
    .sidebar {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        height: 100vh !important;
        width: 280px !important;
        min-width: 280px !important;
        transform: translateX(-100%) !important;
        z-index: 1050 !important;
        box-shadow: var(--shadow-xl) !important;
        transition: transform var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1) !important;
    }
    
    /* 移动端激活时显示 */
    .sidebar.active {
        transform: translateX(0) !important;
    }
    
    /* 移动端收起类无效 */
    .sidebar.sidebar-collapsed {
        width: 0 !important;
        min-width: 0 !important;
        transform: translateX(-100%) !important;
    }
    
    /* 移动端内容区不受桌面端收起影响 */
    .content.sidebar-collapsed {
        flex: 1 !important;
        width: 100% !important;
    }
}

.sidebar-header {
    padding: var(--spacing-lg);
    background: var(--primary-gradient);
    color: var(--text-white);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.sidebar-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-nav {
    padding: var(--spacing-md) 0;
    flex: 1;
}

.sidebar-nav .nav-item {
    margin: var(--spacing-xs) var(--spacing-sm);
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.sidebar-nav .nav-link:hover {
    background: var(--bg-hover);
    color: var(--primary);
}

.sidebar-nav .nav-link.active {
    background: var(--primary);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.sidebar-nav .nav-link i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

/* Content Area - KEY FIX: Fill remaining space */
.content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

/* Top Navbar */
.top-navbar {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1051;
}

.top-navbar .navbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.top-navbar .navbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.user-info .badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
}

/* Main Content */
.main-content {
    padding: var(--spacing-xl);
    flex: 1;
}

/* Page Header */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-header .breadcrumb {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        height: 100vh !important;
        width: 280px !important;
        min-width: 280px !important;
        transform: translateX(-100%) !important;
    }
    
    .sidebar.active {
        transform: translateX(0) !important;
    }
    
    .sidebar.sidebar-collapsed {
        width: 0 !important;
        min-width: 0 !important;
        transform: translateX(-100%) !important;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
}