/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量兼容性回退 - 为旧版浏览器提供默认值 */
/* 这些值会被现代浏览器忽略，因为它们会使用:root中定义的CSS变量 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #1e293b;
    background-color: #f8fafc;
}

.forum-header {
    background-color: #ffffff;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.nav-link {
    color: #1e293b;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary {
    background-color: #2563eb;
    color: #ffffff;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn-secondary {
    background-color: #f8fafc;
    color: #1e293b;
    border: 1px solid #e2e8f0;
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 16px 24px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: #ffffff;
    font-family: inherit;
    color: #1e293b;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.content-center {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 32px;
    border: 1px solid #e2e8f0;
}

/* 统一UI风格指南 - CSS变量系统 */
:root {
    /* 色彩系统 */
    /* 主色调 - 蓝色主题 */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-primary-lighter: #60a5fa;
    --color-primary-dark: #1e40af;
    --color-primary-darker: #1e3a8a;
    
    /* 辅助色调 */
    --color-secondary: #64748b;
    --color-secondary-hover: #475569;
    --color-accent: #818cf8;
    --color-accent-hover: #6366f1;
    
    /* 功能色彩 */
    --color-success: #10b981;
    --color-success-hover: #059669;
    --color-error: #ef4444;
    --color-error-hover: #dc2626;
    --color-warning: #f59e0b;
    --color-warning-hover: #d97706;
    --color-info: #3b82f6;
    --color-info-hover: #2563eb;
    
    /* 文本色彩 */
    --color-text-primary: #1e293b;
    --color-text-secondary: #475569;
    --color-text-tertiary: #64748b;
    --color-text-muted: #94a3b8;
    --color-text-white: #ffffff;
    --color-text-link: #2563eb;
    --color-text-link-hover: #1d4ed8;
    
    /* 背景色彩 */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-hover: #e2e8f0;
    --color-bg-card: #ffffff;
    --color-bg-card-hover: #f8fafc;
    --color-bg-overlay: rgba(30, 41, 59, 0.8);
    
    /* 边框色彩 */
    --color-border-primary: #e2e8f0;
    --color-border-secondary: #cbd5e1;
    --color-border-tertiary: #94a3b8;
    --color-border-hover: #64748b;
    --color-border-focus: #2563eb;
    
    /* 排版系统 */
    /* 字体家族 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    
    /* 字体大小 */
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 21px;
    --font-size-2xl: 24px;
    --font-size-3xl: 28px;
    --font-size-4xl: 36px;
    
    /* 字体权重 */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* 行高 */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2.0;
    
    /* 间距系统 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* 圆角系统 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-hover: 0 15px 30px -5px rgba(0, 0, 0, 0.15), 0 5px 15px -5px rgba(0, 0, 0, 0.05);
    --shadow-inset: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    
    /* 过渡系统 */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-hover: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 旧版变量别名，确保兼容性 */
    --primary-color: var(--color-primary);
    --primary-hover: var(--color-primary-hover);
    --primary-light: var(--color-primary-light);
    --primary-lighter: var(--color-primary-lighter);
    --primary-dark: var(--color-primary-dark);
    --primary-darker: var(--color-primary-darker);
    --secondary-color: var(--color-secondary);
    --secondary-hover: var(--color-secondary-hover);
    --accent-color: var(--color-accent);
    --accent-hover: var(--color-accent-hover);
    --success-color: var(--color-success);
    --success-hover: var(--color-success-hover);
    --error-color: var(--color-error);
    --error-hover: var(--color-error-hover);
    --warning-color: var(--color-warning);
    --warning-hover: var(--color-warning-hover);
    --info-color: var(--color-info);
    --info-hover: var(--color-info-hover);
    --text-primary: var(--color-text-primary);
    --text-secondary: var(--color-text-secondary);
    --text-tertiary: var(--color-text-tertiary);
    --text-muted: var(--color-text-muted);
    --text-white: var(--color-text-white);
    --text-link: var(--color-text-link);
    --text-link-hover: var(--color-text-link-hover);
    --bg-primary: var(--color-bg-primary);
    --bg-secondary: var(--color-bg-secondary);
    --bg-tertiary: var(--color-bg-tertiary);
    --bg-hover: var(--color-bg-hover);
    --bg-card: var(--color-bg-card);
    --bg-card-hover: var(--color-bg-card-hover);
    --bg-overlay: var(--color-bg-overlay);
    --border-primary: var(--color-border-primary);
    --border-secondary: var(--color-border-secondary);
    --border-tertiary: var(--color-border-tertiary);
    --border-hover: var(--color-border-hover);
    --border-focus: var(--color-border-focus);
}

/* 基础样式重置与统一 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color var(--transition-base);
    
    /* 全局过渡效果 */
    * {
        transition: color var(--transition-base), 
                   background-color var(--transition-base), 
                   border-color var(--transition-base), 
                   transform var(--transition-base), 
                   box-shadow var(--transition-base);
    }
}

/* 容器样式统一 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    animation: fadeIn var(--transition-base);
    will-change: opacity, transform;
}

/* 动画效果统一 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes dropdownSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
        box-shadow: var(--shadow-sm);
    }
    to {
        opacity: 1;
        transform: translateY(0);
        box-shadow: var(--shadow-lg);
    }
}

@keyframes sidebarSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes sidebarSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 头部样式统一 */
.forum-header {
    background-color: var(--color-bg-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition-base);
    backdrop-filter: blur(12px);
    background-color: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-border-primary);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    width: 100%;
    flex-wrap: nowrap;
    overflow: visible;
}

.logo h1 {
    font-size: var(--font-3xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--spacing-xs);
}

.logo h1 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
    will-change: color;
}

.logo h1 a:hover {
    color: var(--primary-hover);
}

.slogan {
    font-size: var(--font-sm);
    color: var(--text-tertiary);
    margin: 0;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
    padding: 0;
    margin: 0;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: var(--font-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: color var(--transition-base), background-color var(--transition-base), transform var(--transition-base);
    position: relative;
    overflow: hidden;
    will-change: color, background-color, transform;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
    transition: width var(--transition-base);
    will-change: width;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.08);
    transform: translateY(-1px);
}

/* 导航栏搜索容器 */
.nav-search-container {
    display: flex;
    align-items: center;
    padding: 0;
    margin: 0;
    list-style: none;
}

/* 导航栏搜索功能 */
.nav-search {
    display: flex;
    align-items: center;
    margin: 0;
    flex-shrink: 0;
    min-width: 200px;
    max-width: 300px;
    width: 100%;
    padding: var(--spacing-sm) 0;
}

.search-form-inline {
    width: 100%;
}

.search-input-wrapper {
    display: flex;
    gap: 0;
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    background-color: var(--bg-primary);
    width: 100%;
    box-sizing: border-box;
}

.search-input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.search-input-small {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    font-size: var(--font-base);
    outline: none;
    color: var(--text-primary);
    border-radius: 0;
    box-shadow: none;
    transition: all var(--transition-base);
}

.search-btn-small {
    background-color: var(--primary-color);
    color: var(--text-white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    flex-shrink: 0;
}

.search-btn-small:hover {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

/* 导航栏下拉菜单 */
.nav-item-with-dropdown {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-card);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    min-width: 180px;
    padding: var(--spacing-xs) 0;
    display: none;
    border: 1px solid var(--border-primary);
    margin-top: var(--spacing-xs);
    z-index: 1001;
    opacity: 0;
    transform: translateY(-8px);
    transition: all var(--transition-base);
    pointer-events: none;
}

.nav-item-with-dropdown:hover .nav-dropdown {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.nav-dropdown .dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-xl);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-base);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav-dropdown .dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background-color: var(--primary-color);
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.nav-dropdown .dropdown-item:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    padding-left: calc(var(--spacing-xl) + 4px);
}

.nav-dropdown .dropdown-item:hover::before {
    transform: scaleY(1);
}

/* 确保导航栏稳定显示 */
/* 头部内容区域样式统一 */
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    width: 100%;
    flex-wrap: nowrap;
    overflow: visible;
    position: relative;
    height: auto;
    min-height: 80px;
}

/* 导航区域样式统一 */
.main-nav {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin: 0 var(--spacing-lg);
    position: relative;
    overflow: visible;
}

/* 导航列表样式统一 */
.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
    padding: 0;
    margin: 0;
}

.nav-list li {
    display: flex;
    align-items: center;
    position: relative;
}

/* 导航链接样式统一 */
.nav-link {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: color var(--transition-base), background-color var(--transition-base), transform var(--transition-base);
    position: relative;
    overflow: hidden;
    will-change: color, background-color, transform;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
    transition: width var(--transition-base);
    will-change: width;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.08);
    transform: translateY(-1px);
}

/* 导航栏搜索容器样式统一 */
.nav-search-container {
    display: flex;
    align-items: center;
    padding: 0;
    margin: 0;
    list-style: none;
}

/* 导航栏搜索功能样式统一 */
.nav-search {
    display: flex;
    align-items: center;
    margin: 0;
    flex-shrink: 0;
    min-width: 200px;
    max-width: 300px;
    width: 100%;
    padding: var(--spacing-sm) 0;
}

.search-form-inline {
    width: 100%;
}

.search-input-wrapper {
    display: flex;
    gap: 0;
    border: 2px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    background-color: var(--color-bg-primary);
    width: 100%;
    box-sizing: border-box;
}

.search-input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.search-input-small {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    font-size: var(--font-size-base);
    outline: none;
    color: var(--color-text-primary);
    border-radius: 0;
    box-shadow: none;
    transition: all var(--transition-base);
}

.search-btn-small {
    background-color: var(--color-primary);
    color: var(--color-text-white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    flex-shrink: 0;
}

.search-btn-small:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.05);
}

/* 导航栏下拉菜单样式统一 */
.nav-item-with-dropdown {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-bg-card);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    min-width: 180px;
    padding: var(--spacing-xs) 0;
    display: none;
    border: 1px solid var(--color-border-primary);
    margin-top: var(--spacing-xs);
    z-index: 1001;
    opacity: 0;
    transform: translateY(-8px);
    transition: all var(--transition-base);
    pointer-events: none;
}

.nav-item-with-dropdown:hover .nav-dropdown {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.nav-dropdown .dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-xl);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav-dropdown .dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.nav-dropdown .dropdown-item:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--color-primary);
    padding-left: calc(var(--spacing-xl) + 4px);
}

.nav-dropdown .dropdown-item:hover::before {
    transform: scaleY(1);
}

/* 用户信息区域样式统一 */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-shrink: 0;
}

.user-avatar img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    object-fit: cover;
    cursor: pointer;
    border: 2px solid var(--color-border-primary);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.user-avatar img:hover {
    transform: scale(1.1);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.user-menu {
    position: relative;
}

.username {
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.username:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--color-primary);
}

/* 下拉菜单样式统一 */
.dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--color-bg-card);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-lg);
    min-width: 160px;
    padding: var(--spacing-xs) 0;
    display: none;
    border: 1px solid var(--color-border-primary);
    margin-top: var(--spacing-xs);
    z-index: 1001;
    opacity: 0;
    transform: translateY(-8px);
    transition: all var(--transition-base);
    pointer-events: none;
    overflow: hidden;
}

.dropdown.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-xl);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.dropdown-item:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--color-primary);
    padding-left: calc(var(--spacing-xl) + 4px);
}

.dropdown-item:hover::before {
    transform: scaleY(1);
}

/* 按钮样式统一 */
.btn-create {
    background-color: var(--color-primary);
    color: var(--color-text-white) !important;
    transition: all var(--transition-base);
    will-change: background-color, transform, box-shadow;
    box-shadow: var(--shadow-sm);
}

.btn-create:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-create {
    background-color: var(--primary-color);
    color: var(--text-white) !important;
    transition: all var(--transition-base);
    will-change: background-color, transform, box-shadow;
    box-shadow: var(--shadow-sm);
}

.btn-create:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-avatar img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    object-fit: cover;
    cursor: pointer;
    border: 2px solid var(--border-primary);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.user-avatar img:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.user-menu {
    position: relative;
}

.username {
    font-weight: var(--font-medium);
    cursor: pointer;
    color: var(--text-primary);
    font-size: var(--font-base);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.username:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
}

.dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--bg-card);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-lg);
    min-width: 160px;
    padding: var(--spacing-xs) 0;
    display: none;
    border: 1px solid var(--border-primary);
    margin-top: var(--spacing-xs);
    z-index: 1001;
    animation: dropdownSlideIn var(--transition-base) ease-out;
}

@keyframes dropdownSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
        box-shadow: var(--shadow-sm);
    }
    to {
        opacity: 1;
        transform: translateY(0);
        box-shadow: var(--shadow-lg);
    }
}

.user-menu:hover .dropdown {
    display: block;
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-xl);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-base);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background-color: var(--primary-color);
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.dropdown-item:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    padding-left: calc(var(--spacing-xl) + 4px);
}

.dropdown-item:hover::before {
    transform: scaleY(1);
}

/* 主内容区域 */
.forum-main {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
    animation: fadeIn var(--transition-base);
}

.main-content {
    display: grid;
    grid-template-columns: 240px 1fr 240px;
    gap: var(--spacing-xl);
    animation: fadeInUp var(--transition-base) ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 通用边栏样式 */
.sidebar-left,
.sidebar-right {
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-base);
    animation: sidebarSlideIn var(--transition-base) ease-out;
}

@keyframes sidebarSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.sidebar-right {
    animation: sidebarSlideInRight var(--transition-base) ease-out;
}

@keyframes sidebarSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.sidebar-left:hover,
.sidebar-right:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.sidebar-section {
    margin-bottom: var(--spacing-2xl);
}

.sidebar-section h3 {
    font-size: var(--font-xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid rgba(37, 99, 235, 0.12);
    position: relative;
    line-height: 1.3;
    letter-spacing: -0.015em;
}

.sidebar-section h3::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
    transition: width var(--transition-base);
}

.sidebar-section:hover h3::after {
    width: 100px;
}

/* 板块列表 */
.category-list {
    list-style: none;
}

.category-item {
    margin-bottom: 8px;
}

.category-item a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.category-item a:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    transform: translateX(4px);
}

.category-icon {
    margin-right: 10px;
    font-size: 16px;
}

.category-name {
    flex: 1;
}

.category-count {
    font-size: 12px;
    color: #999;
    background-color: #f5f7fa;
    padding: 2px 8px;
    border-radius: 12px;
}

/* 最新动态 */
.activity-list {
    list-style: none;
}

.activity-item {
    padding: 10px 0;
    border-bottom: 1px solid #f0f5ff;
    font-size: 12px;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-user {
    font-weight: 500;
    color: #4A90E2;
    margin-right: 5px;
}

.activity-action {
    color: #666;
    margin-right: 5px;
}

.activity-title {
    color: #333;
    text-decoration: none;
    margin-right: 5px;
}

.activity-title:hover {
    text-decoration: underline;
}

.activity-time {
    color: #999;
    float: right;
}

/* 中间内容区域 */
.content-center {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-base);
}

.content-center:hover {
    box-shadow: var(--shadow-lg);
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-primary);
}

.content-header h2 {
    font-size: var(--font-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.content-header h2::before {
    content: '';
    display: block;
    width: 4px;
    height: 24px;
    background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

/* 按钮样式 - 现代化设计 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-weight: var(--font-medium);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--font-base);
    position: relative;
    overflow: hidden;
    will-change: transform, box-shadow, background-color;
    font-family: inherit;
    line-height: 1.5;
    min-height: 40px;
}

.btn:active {
    transform: translateY(1px);
    box-shadow: var(--shadow-sm);
}

/* 按钮点击波纹效果 - 增强视觉反馈 */
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    transform: translate(-50%, -50%) scale(0);
    transition: transform var(--transition-slow);
    pointer-events: none;
    z-index: 1;
}

.btn:active::after {
    transform: translate(-50%, -50%) scale(80);
}

/* 主按钮样式 */
.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 辅助按钮样式 */
.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-secondary);
    transform: translateY(-1px);
}

/* 链接按钮样式 */
.btn-link {
    background-color: transparent;
    color: var(--text-link);
    padding: 8px 16px;
}

.btn-link:hover {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--text-link-hover);
    transform: translateY(-1px);
}

/* 危险按钮样式 */
.btn-danger {
    background-color: var(--error-color);
    color: var(--text-white);
}

.btn-danger:hover {
    background-color: var(--error-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 帖子筛选 */
.posts-filter {
    margin-bottom: 20px;
}

.filter-select {
    padding: 8px 12px;
    border: 1px solid #e0e6ed;
    border-radius: 4px;
    background-color: #fff;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.filter-select:focus {
    outline: none;
    border-color: #4A90E2;
}

/* 帖子列表 */
.posts-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.post-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-hover);
    background-color: var(--bg-card);
    transform: translateY(0);
    will-change: box-shadow, transform, border-color;
    position: relative;
    overflow: hidden;
}

.post-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.post-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary-light);
    background-color: var(--bg-card-hover);
}

.post-item:hover::before {
    opacity: 1;
}

.post-info {
    flex: 1;
    margin-right: 20px;
}

.post-category {
    margin-bottom: 8px;
}

.post-category a {
    display: inline-block;
    padding: 4px 12px;
    background-color: #f0f5ff;
    color: #4A90E2;
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    border-radius: 12px;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    will-change: background-color, color;
}

.post-category a:hover {
    background-color: #4A90E2;
    color: #fff;
}

.post-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.4;
}

.post-title a {
    color: #333;
    text-decoration: none;
    transition: color var(--transition-fast);
    will-change: color;
}

.post-title a:hover {
    color: #4A90E2;
    text-decoration: underline;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 12px;
    color: #999;
    margin-bottom: 10px;
}

.post-author {
    display: flex;
    align-items: center;
    gap: 5px;
}

.post-author img {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
    transition: transform var(--transition-fast);
    will-change: transform;
}

.post-author img:hover {
    transform: scale(1.1);
}

.post-author a {
    color: #4A90E2;
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    will-change: color;
}

.post-author a:hover {
    text-decoration: underline;
    color: var(--primary-hover);
}

.post-excerpt {
    font-size: 13px;
    color: #666;
    line-height: 1.5;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 帖子统计 */
.post-stats {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 80px;
    text-align: center;
}

.stats-replies,
.stats-likes {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.stats-number {
    font-size: 18px;
    font-weight: 700;
    color: #4A90E2;
}

.stats-label {
    font-size: 12px;
    color: #999;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
}

.page-item {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-base);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    will-change: transform, background-color, border-color, color;
    min-width: 40px;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.page-item:hover:not(.disabled) {
    transform: translateY(-1px);
    background-color: rgba(37, 99, 235, 0.08);
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.page-item.active {
    background-color: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.page-item.disabled {
    color: var(--text-muted);
    border-color: var(--border-primary);
    cursor: not-allowed;
    background-color: var(--bg-card);
    transition: none;
}

.page-item.disabled:hover {
    color: var(--text-muted);
    border-color: var(--border-primary);
    background-color: var(--bg-card);
    transform: none;
    box-shadow: none;
}

/* 热门帖子 */
.hot-posts-list {
    list-style: none;
}

.hot-post-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid #f0f5ff;
    font-size: 13px;
    transition: transform var(--transition-fast);
    will-change: transform;
}

.hot-post-item:last-child {
    border-bottom: none;
}

.hot-post-item:hover {
    transform: translateX(4px);
}

.hot-rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--font-xs);
    font-weight: var(--font-bold);
    transition: all var(--transition-base);
    border: 1px solid var(--border-primary);
}

.hot-post-item:nth-child(1) .hot-rank,
.hot-post-item:nth-child(2) .hot-rank,
.hot-post-item:nth-child(3) .hot-rank {
    background-color: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.hot-title {
    flex: 1;
    color: var(--text-primary);
    text-decoration: none;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all var(--transition-base);
    will-change: color;
    padding: var(--spacing-xs) 0;
}

.hot-title:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.hot-replies {
    font-size: var(--font-xs);
    color: var(--text-link);
    background-color: rgba(37, 99, 235, 0.08);
    padding: 3px 8px;
    border-radius: var(--radius-full);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
}

.hot-replies:hover {
    background-color: rgba(37, 99, 235, 0.16);
    color: var(--primary-color);
}

/* 在线用户 */
.online-users {
    text-align: center;
}

.online-stats {
    margin-bottom: 15px;
}

.online-count {
    display: block;
    font-size: var(--font-2xl);
    font-weight: var(--font-bold);
    color: var(--primary-color);
    transition: all var(--transition-base);
}

.online-label {
    font-size: var(--font-sm);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

.users-avatars {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: -8px;
    margin-top: 10px;
}

.users-avatars img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #fff;
    margin-left: -8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    will-change: transform, box-shadow;
    position: relative;
    z-index: 0;
}

.users-avatars img:first-child {
    margin-left: 0;
}

.users-avatars img:hover {
    transform: scale(1.2);
    z-index: 10;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.more-users {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background-color: #f5f7fa;
    color: #999;
    border-radius: 50%;
    font-size: 11px;
    font-weight: 600;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-left: -8px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    will-change: transform, box-shadow;
}

.more-users:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    z-index: 10;
}

/* 页脚 */
.forum-footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-3xl);
    box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.05);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: var(--spacing-xl);
}

.footer-info h3 {
    font-size: var(--font-xl);
    font-weight: var(--font-bold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-info p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: var(--line-height-relaxed);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
    margin: var(--spacing-xs) 0;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-sm);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
    will-change: color, transform;
    position: relative;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

.footer-links a:hover {
    color: var(--primary-color);
    transform: translateY(-1px);
    background-color: rgba(37, 99, 235, 0.08);
}

.footer-links a:hover::after {
    width: 100%;
}

.footer-copyright {
    font-size: var(--font-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-primary);
    width: 100%;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 200px 1fr 200px;
    }
    
    .nav-list {
        gap: 20px;
    }
}

@media (max-width: 1024px) {
    .nav-search {
        max-width: 250px;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
        padding: 15px 0;
        align-items: stretch;
    }
    
    .nav-list {
        gap: 15px;
    }
    
    .main-content {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .sidebar-left,
    .sidebar-right {
        order: 2;
    }
    
    .content-center {
        order: 1;
    }
    
    .nav-toggle {
        display: block;
        cursor: pointer;
        padding: var(--spacing-sm);
        border-radius: var(--radius-md);
        transition: background-color var(--transition-fast);
        will-change: background-color;
        position: absolute;
        right: var(--spacing-lg);
        top: var(--spacing-md);
    }
    
    .nav-toggle:hover {
        background-color: var(--bg-hover);
    }
    
    .nav-toggle span {
        display: block;
        width: 25px;
        height: 3px;
        background-color: var(--text-primary);
        margin: 5px 0;
        transition: transform var(--transition-base), opacity var(--transition-base);
        border-radius: 2px;
        will-change: transform, opacity;
    }
    
    .rotate-45 {
        transform: rotate(45deg) translate(5px, 5px) !important;
    }
    
    .-rotate-45 {
        transform: rotate(-45deg) translate(5px, -5px) !important;
    }
    
    .opacity-0 {
        opacity: 0 !important;
    }
    
    .main-nav {
        display: none;
        width: 100%;
        animation: slideInDown var(--transition-base);
        margin: var(--spacing-sm) 0;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .nav-list {
        flex-direction: column;
        width: 100%;
        gap: 10px;
        align-items: center;
    }
    
    .nav-link {
        display: block;
        width: 100%;
        text-align: center;
    }
    
    /* 移动端导航栏搜索功能 */
    .nav-search {
        max-width: 100%;
        margin: var(--spacing-sm) 0;
    }
    
    .nav-item-with-dropdown {
        position: relative;
        width: 100%;
        text-align: center;
    }
    
    .nav-dropdown {
        left: 50%;
        transform: translateX(-50%) translateY(-8px);
    }
    
    .nav-item-with-dropdown:hover .nav-dropdown {
        transform: translateX(-50%) translateY(0);
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .content-center {
        padding: 15px;
    }
    
    .post-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .post-stats {
        flex-direction: row;
        justify-content: flex-start;
        gap: 20px;
        text-align: left;
    }
    
    .stats-replies,
    .stats-likes {
        flex-direction: row;
        gap: 5px;
    }
    
    .content-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}

/* 表单样式 */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    font-size: var(--font-base);
    line-height: 1.4;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-base);
    transition: all var(--transition-base);
    background-color: var(--bg-primary);
    font-family: inherit;
    color: var(--text-primary);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
    will-change: border-color, box-shadow, transform;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    transform: translateY(-1px);
}

.form-input:hover,
.form-textarea:hover,
.form-select:hover {
    border-color: var(--border-secondary);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    line-height: var(--line-height-relaxed);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
    opacity: 1;
}

/* 表单验证样式 */
.form-input:invalid,
.form-textarea:invalid,
.form-select:invalid {
    border-color: var(--error-color);
}

.form-input:invalid:focus,
.form-textarea:invalid:focus,
.form-select:invalid:focus {
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* 帖子详情页样式 */
.thread-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f5ff;
}

.thread-title {
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin-bottom: 15px;
    line-height: 1.4;
}

.thread-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 13px;
    color: #999;
}

.thread-content {
    margin-bottom: 30px;
    padding: 20px;
    background-color: #fafbfc;
    border-radius: 8px;
    line-height: 1.6;
    color: #333;
}

.thread-content p {
    margin-bottom: 15px;
}

.thread-content h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 20px 0 15px;
    color: #333;
}

.thread-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 20px 0 15px;
    color: #333;
}

.thread-content ul,
.thread-content ol {
    margin: 15px 0;
    padding-left: 25px;
}

.thread-content li {
    margin-bottom: 8px;
}

/* 评论区域 */
.comments-section {
    margin-top: 40px;
}

.comments-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
}

.comment-item {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    padding: 15px;
    background-color: #fafbfc;
    border-radius: 8px;
}

.comment-avatar {
    flex-shrink: 0;
}

.comment-avatar img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.comment-content {
    flex: 1;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.comment-author {
    font-weight: 500;
    color: #4A90E2;
    text-decoration: none;
}

.comment-author:hover {
    text-decoration: underline;
}

.comment-time {
    font-size: 12px;
    color: #999;
}

.comment-text {
    font-size: 14px;
    color: #333;
    line-height: 1.5;
    margin-bottom: 10px;
}

.comment-actions {
    display: flex;
    gap: 15px;
    font-size: 12px;
}

.comment-action {
    color: #999;
    text-decoration: none;
    cursor: pointer;
    transition: color 0.3s ease;
}

.comment-action:hover {
    color: #4A90E2;
}

/* 发布评论区域 */
.comment-form {
    margin-top: 30px;
    padding: 20px;
    background-color: #fafbfc;
    border-radius: 8px;
}

.comment-form-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

/* 发布帖子页面 */
.create-post-form {
    max-width: 800px;
    margin: 0 auto;
}

.form-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
    text-align: center;
}

/* 板块页面 */
.category-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f0f5ff;
}

.category-title {
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

.category-description {
    font-size: 14px;
    color: #666;
    margin: 0;
}

/* 用户页面 */
.user-profile {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background-color: #fafbfc;
    border-radius: 8px;
}

.user-avatar-large {
    flex-shrink: 0;
}

.user-avatar-large img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.user-info-main {
    flex: 1;
}

.user-name {
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

.user-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    font-size: 14px;
    color: #666;
}

.user-stat-item {
    display: flex;
    gap: 5px;
    align-items: center;
}

.user-stat-value {
    font-weight: 600;
    color: #4A90E2;
}

.user-bio {
    font-size: 14px;
    color: #333;
    line-height: 1.5;
    margin-bottom: 15px;
}

/* 搜索页面 */
.search-form {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    padding: 20px;
    background-color: #fafbfc;
    border-radius: 8px;
}

.search-input {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid #e0e6ed;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: #4A90E2;
}

.search-results-count {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    padding: 10px 0;
    border-bottom: 1px solid #f0f5ff;
}

/* 错误页面 */
.error-page {
    text-align: center;
    padding: 60px 20px;
}

.error-code {
    font-size: 72px;
    font-weight: 700;
    color: #4A90E2;
    margin-bottom: 20px;
}

.error-message {
    font-size: 24px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.error-description {
    font-size: 16px;
    color: #666;
    margin-bottom: 30px;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-primary);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 0.6s linear infinite;
    margin: 0 auto;
}

.loading-overlay {
    animation: fadeIn var(--transition-fast);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 添加平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 添加焦点样式优化 */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
    transition: outline-color var(--transition-base);
}

/* 自定义复选框和单选按钮样式 */
input[type="checkbox"],
input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    will-change: border-color, background-color, box-shadow;
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-white);
    vertical-align: middle;
}

input[type="checkbox"] {
    border-radius: var(--radius-sm);
}

input[type="radio"] {
    border-radius: var(--radius-full);
}

input[type="checkbox"]:checked,
input[type="radio"]:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

input[type="checkbox"]:checked::after {
    content: '✓';
    color: var(--text-white);
    font-size: 12px;
    font-weight: var(--font-bold);
    line-height: 1;
}

input[type="radio"]:checked::after {
    content: '';
    width: 8px;
    height: 8px;
    background-color: var(--text-white);
    border-radius: var(--radius-full);
}

input[type="checkbox"]:hover,
input[type="radio"]:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
}

input[type="checkbox"]:disabled,
input[type="radio"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-secondary);
}

/* 优化表单元素交互 */
.form-input,
.form-textarea,
.form-select {
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
    will-change: border-color, box-shadow, transform;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    transform: translateY(-1px);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    outline: none;
}

/* 优化链接交互 */
a {
    transition: all var(--transition-base);
    will-change: color, transform;
    position: relative;
}

a:not(.btn):not(.nav-link):not(.topic-tag):hover {
    color: var(--primary-color);
    text-decoration: underline;
    transform: translateY(-1px);
}

/* 优化按钮组交互 */
.btn-group {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.btn-group .btn {
    border-radius: var(--radius-md);
}

/* 优化加载状态 */
.loading {
    display: inline-block;
    width: 28px;
    height: 28px;
    border: 3px solid var(--border-primary);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
    box-shadow: var(--shadow-sm);
}

.loading-overlay {
    animation: fadeIn var(--transition-fast);
    background-color: var(--bg-overlay);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-text {
    color: var(--text-white);
    font-size: var(--font-lg);
    font-weight: var(--font-medium);
    margin-left: var(--spacing-lg);
}

/* 优化滑块样式 */
input[type="range"] {
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background-color: var(--border-primary);
    outline: none;
    transition: all var(--transition-base);
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background-color: var(--primary-color);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--bg-white);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background-color: var(--primary-color);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--bg-white);
}

input[type="range"]:hover {
    background-color: var(--border-secondary);
}

input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

input[type="range"]:hover::-moz-range-thumb {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

/* 优化进度条样式 */
.progress {
    width: 100%;
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    will-change: width;
    box-shadow: 0 0 10px rgba(37, 99, 235, 0.3);
}

/* 优化图片加载效果 */
img {
    transition: opacity var(--transition-base), transform var(--transition-base);
    object-fit: cover;
    will-change: opacity, transform;
}

/* 优化评论交互 */
.comment-item {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    will-change: transform, box-shadow;
}

.comment-item:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 优化头像交互 */
.user-avatar img,
.comment-avatar img {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
    will-change: transform, box-shadow;
}

.user-avatar img:hover,
.comment-avatar img:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

/* 优化分类列表交互 */
.category-item a {
    transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
    will-change: transform, background-color, color;
}

.category-item a:hover {
    transform: translateX(4px);
}

/* 简化的分类卡片样式 */
.category-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.category-icon {
    font-size: 24px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.category-card:hover .category-icon {
    background-color: rgba(37, 99, 235, 0.2);
    transform: scale(1.1);
}

.category-details h3 {
    font-size: var(--font-lg);
    font-weight: var(--font-semibold);
    margin: 0 0 var(--spacing-xs) 0;
    line-height: 1.3;
}

.category-details h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.category-details h3 a:hover {
    color: var(--primary-color);
}

.category-desc {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.4;
}

.category-stats-simple {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    font-size: var(--font-sm);
}

.category-stats-simple .stat {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
}

.category-card:hover .stat {
    background-color: rgba(37, 99, 235, 0.16);
    transform: translateY(-1px);
}

/* 简化的搜索表单样式 */
.search-section {
    margin-bottom: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.search-form-simple {
    margin-bottom: var(--spacing-lg);
    width: 100%;
    max-width: 600px;
}

.search-input-group {
    display: flex;
    gap: 0;
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    background-color: var(--bg-primary);
    width: 100%;
}

.search-input-group:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    transform: translateY(-1px);
}

.search-form-simple .search-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: transparent;
    font-size: var(--font-md);
    outline: none;
    color: var(--text-primary);
    border-radius: 0;
    box-shadow: none;
}

.search-form-simple .btn-search {
    background-color: var(--primary-color);
    color: var(--text-white);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-form-simple .btn-search:hover {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

.search-results-info {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(37, 99, 235, 0.04);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    width: 100%;
    max-width: 600px;
    text-align: center;
}

/* 简化的分页样式 */
.pagination-simple {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xl);
}

.page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--spacing-md);
    border: 1px solid var(--border-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
    cursor: pointer;
}

.page-btn:hover:not(.disabled) {
    background-color: rgba(37, 99, 235, 0.08);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.page-btn.active {
    background-color: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.page-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-secondary);
    color: var(--text-muted);
}

.page-btn.disabled:hover {
    transform: none;
    box-shadow: none;
    background-color: var(--bg-secondary);
    color: var(--text-muted);
    border-color: var(--border-primary);
}

/* 优化按钮组交互 */
.btn-group .btn {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    will-change: transform, box-shadow;
}

.btn-group .btn:hover {
    transform: translateY(-1px);
}

/* 优化下拉菜单动画 */
.dropdown {
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility 0s linear var(--transition-fast);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    will-change: opacity, transform;
}

.user-menu:hover .dropdown,
.dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
}

/* 成功/错误提示 */
.alert {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-base);
    font-weight: var(--font-medium);
    animation: slideInDown var(--transition-base);
    position: relative;
    overflow: hidden;
    will-change: opacity, transform;
    border-left: 4px solid;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.alert::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    animation: progressBar 3s ease-out forwards;
}

@keyframes progressBar {
    to {
        transform: scaleX(1);
    }
}

.alert-success {
    background-color: #ecfdf5;
    color: #065f46;
    border-left-color: var(--success-color);
}

.alert-error {
    background-color: #fef2f2;
    color: #991b1b;
    border-left-color: var(--error-color);
}

.alert-info {
    background-color: #eff6ff;
    color: #1e40af;
    border-left-color: var(--info-color);
}

.alert-warning {
    background-color: #fffbeb;
    color: #92400e;
    border-left-color: var(--warning-color);
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 登录和注册页面样式 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    position: relative;
}

.login-box {
    background-color: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    will-change: transform, box-shadow;
    position: relative;
    overflow: hidden;
}

.login-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.login-title {
    font-size: var(--font-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.login-form .form-group {
    margin-bottom: var(--spacing-md);
}

.login-form .form-label {
    display: block;
    font-weight: var(--font-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-sm);
}

.login-form .form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: var(--font-base);
    background-color: var(--bg-white);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    will-change: border-color, box-shadow;
}

.login-form .form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
    outline: none;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-sm);
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-option input[type="checkbox"] {
    margin: 0;
}

.forgot-password, .register-link, .login-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.forgot-password:hover, .register-link:hover, .login-link:hover {
    text-decoration: underline;
    color: var(--primary-dark);
}

.btn-full {
    width: 100%;
}

.login-footer {
    margin-top: var(--spacing-lg);
    text-align: center;
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

/* 管理员登录入口样式 */
.admin-login-entry {
    position: absolute;
    right: var(--spacing-lg);
    bottom: var(--spacing-lg);
    width: 100%;
    text-align: right;
}

.btn-admin-login {
    background-color: var(--primary-color);
    color: var(--text-white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    opacity: 0.8;
}

.btn-admin-login:hover {
    background-color: var(--primary-hover);
    opacity: 1;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    animation: fadeIn var(--transition-base);
}

.modal-content {
    background-color: var(--bg-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 420px;
    margin: var(--spacing-lg);
    animation: slideInUp var(--transition-base) ease-out;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
}

.modal-header h3 {
    margin: 0;
    font-size: var(--font-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-2xl);
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.modal-close:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    transform: rotate(90deg);
}

/* 管理员登录表单样式 */
.admin-login-form {
    padding: var(--spacing-xl);
}

.admin-login-form .form-group {
    margin-bottom: var(--spacing-md);
}

.admin-login-form .form-label {
    display: block;
    font-weight: var(--font-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-sm);
}

.admin-login-form .form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-base);
    background-color: var(--bg-white);
    color: var(--text-primary);
    transition: all var(--transition-base);
    will-change: border-color, box-shadow;
}

.admin-login-form .form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    outline: none;
}

/* 验证码样式 */
.captcha-group {
    margin-bottom: var(--spacing-md);
}

.captcha-row {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.captcha-input-wrapper {
    flex: 1;
}

.captcha-image-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.captcha-image {
    width: 120px;
    height: 48px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    object-fit: cover;
}

.captcha-image:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-sm);
}

.btn-refresh-captcha {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-xs);
    cursor: pointer;
    transition: all var(--transition-base);
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-refresh-captcha:hover {
    background-color: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .admin-login-entry {
        position: static;
        text-align: center;
        margin-top: var(--spacing-lg);
    }
    
    .captcha-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .captcha-image-wrapper {
        width: 100%;
        justify-content: space-between;
    }
    
    .captcha-image {
        flex: 1;
        width: auto;
    }
    
    .btn-refresh-captcha {
        white-space: nowrap;
    }
    
    .modal-content {
        margin: var(--spacing-md);
        max-width: calc(100% - var(--spacing-md) * 2);
    }
    
    .admin-login-form {
        padding: var(--spacing-md);
    }
    
    .modal-header {
        padding: var(--spacing-md);
    }
}

/* 聊天页面样式 */
.chat-main {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

/* 闲聊欢迎页面样式 */
.chat-welcome {
    width: 100%;
    max-width: 1000px;
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-3xl);
    text-align: center;
    border: 1px solid var(--border-primary);
    transition: all var(--transition-base);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.chat-welcome::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.chat-welcome:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.welcome-header h1 {
    font-size: var(--font-4xl);
    font-weight: var(--font-extrabold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    letter-spacing: -0.025em;
    transition: all var(--transition-base);
}

.welcome-header h1:hover {
    filter: brightness(1.1);
}

.welcome-subtitle {
    font-size: var(--font-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: var(--line-height-relaxed);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    font-weight: var(--font-normal);
    background-color: rgba(37, 99, 235, 0.04);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.chat-actions {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
    align-items: center;
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-lg);
    font-weight: var(--font-semibold);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    will-change: transform, box-shadow, background-color;
    border-radius: var(--radius-xl);
    min-height: 56px;
    min-width: 200px;
    justify-content: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-large::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
    z-index: -1;
}

.btn-large:hover::before {
    left: 100%;
}

.btn-large:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-large:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.btn-chat {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--text-white);
    box-shadow: var(--shadow-md);
    border: none;
}

.btn-chat:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--accent-hover));
    box-shadow: var(--shadow-lg);
}

.btn-large .btn-icon {
    font-size: var(--font-xl);
    transition: transform var(--transition-base);
}

.btn-large:hover .btn-icon {
    transform: scale(1.2) rotate(10deg);
}

/* 功能特点 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
    padding: var(--spacing-lg);
    background-color: rgba(37, 99, 235, 0.02);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.feature-item {
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-base);
    will-change: transform, box-shadow, border-color;
    border: 1px solid var(--border-primary);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.feature-item:hover::before {
    transform: scaleX(1);
}

.feature-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: var(--font-4xl);
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 96px;
    height: 96px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(129, 140, 248, 0.12));
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    margin-top: var(--spacing-xs);
    border: 2px solid rgba(37, 99, 235, 0.1);
}

.feature-item:hover .feature-icon {
    transform: scale(1.15) rotate(5deg);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.24), rgba(129, 140, 248, 0.24));
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.feature-item h3 {
    font-size: var(--font-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
    letter-spacing: -0.015em;
}

.feature-item p {
    font-size: var(--font-base);
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin: 0;
    padding: 0 var(--spacing-sm);
}

/* 热门话题 */
.trending-topics {
    margin-bottom: var(--spacing-3xl);
    background-color: rgba(37, 99, 235, 0.02);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.trending-topics h2 {
    font-size: var(--font-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    padding-bottom: var(--spacing-md);
    position: relative;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.trending-topics h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: translateX(-50%) scaleX(1);
    }
    50% {
        opacity: 0.8;
        transform: translateX(-50%) scaleX(1.1);
    }
}

.topics-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    padding: var(--spacing-lg);
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
}

.topic-tag {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: var(--font-base);
    font-weight: var(--font-semibold);
    transition: all var(--transition-base);
    will-change: transform, background-color, box-shadow, color;
    border: 2px solid var(--border-primary);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.topic-tag::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
    z-index: -1;
}

.topic-tag:hover::before {
    width: 300px;
    height: 300px;
}

.topic-tag:hover {
    color: var(--text-white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.topic-tag::after {
    content: '#';
    font-weight: var(--font-extrabold);
    font-size: var(--font-lg);
    color: var(--primary-color);
    transition: color var(--transition-base);
}

.topic-tag:hover::after {
    color: var(--text-white);
}

/* 在线用户 */
.online-section {
    margin-bottom: var(--spacing-2xl);
    background-color: rgba(37, 99, 235, 0.02);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.online-section h2 {
    font-size: var(--font-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    padding-bottom: var(--spacing-md);
    position: relative;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.online-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

.online-users-showcase {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    padding: var(--spacing-xl);
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
    min-height: 180px;
}

.user-avatar-small {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    position: relative;
    z-index: 1;
    min-width: 80px;
}

.user-avatar-small::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(37, 99, 235, 0.05);
    border-radius: var(--radius-lg);
    transform: scale(0);
    transition: transform var(--transition-base);
    z-index: -1;
}

.user-avatar-small:hover::before {
    transform: scale(1);
}

.user-avatar-small img {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 4px solid var(--bg-primary);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    will-change: transform, box-shadow, border-color;
    object-fit: cover;
    position: relative;
    z-index: 1;
}

.user-avatar-small img::after {
    content: '';
    position: absolute;
    top: -2px;
    right: -2px;
    width: 16px;
    height: 16px;
    background-color: var(--success-color);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    z-index: 2;
}

.user-avatar-small:hover img {
    transform: scale(1.25) rotate(5deg);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.user-avatar-small:hover {
    transform: translateY(-4px);
}

.username-small {
    font-size: var(--font-sm);
    color: var(--text-primary);
    font-weight: var(--font-semibold);
    text-align: center;
    line-height: 1.3;
    max-width: 100px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition-base);
}

.user-avatar-small:hover .username-small {
    color: var(--primary-color);
}

.more-users {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--text-white);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-bold);
    font-size: var(--font-base);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    will-change: transform, box-shadow;
    border: 4px solid var(--bg-primary);
    position: relative;
    overflow: hidden;
    z-index: 1;
    cursor: pointer;
}

.more-users::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
    z-index: -1;
}

.more-users:hover::before {
    width: 200px;
    height: 200px;
}

.more-users:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--primary-hover), var(--accent-hover));
}

.more-users-text {
    position: relative;
    z-index: 1;
    transition: transform var(--transition-base);
}

.more-users:hover .more-users-text {
    transform: scale(1.1);
}

/* 聊天界面样式 */
.chat-container {
    width: 100%;
    max-width: 800px;
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
    overflow: hidden;
    border: 1px solid var(--border-primary);
}

.chat-header {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(8px);
}

.chat-header h2 {
    font-size: var(--font-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chat-header h2::before {
    content: '';
    display: block;
    width: 8px;
    height: 24px;
    background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
    border-radius: 4px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    background-color: var(--bg-primary);
    background-image: radial-gradient(circle at 25px 25px, rgba(37, 99, 235, 0.03) 0%, transparent 0%),
                      radial-gradient(circle at 75px 75px, rgba(37, 99, 235, 0.02) 0%, transparent 0%);
    background-size: 100px 100px;
}

/* 滚动条美化 */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background-color: var(--bg-secondary);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-secondary);
    border-radius: 3px;
    transition: background-color var(--transition-base);
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary-color);
}

.message {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    animation: messageSlideIn var(--transition-base) ease-out;
    will-change: opacity, transform;
    max-width: 100%;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.system-message {
    justify-content: center;
    margin: var(--spacing-md) 0;
    width: 100%;
}

.system-message .message-content {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: var(--font-medium);
    border: 1px solid rgba(37, 99, 235, 0.16);
}

.user-message {
    align-self: flex-start;
    max-width: 80%;
}

.own-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.own-message .message-content {
    background-color: var(--primary-color);
    color: var(--text-white);
    border-bottom-right-radius: 4px;
}

.own-message .message-header {
    flex-direction: row-reverse;
}

.own-message .message-username {
    color: rgba(255, 255, 255, 0.9);
}

.own-message .message-time {
    color: rgba(255, 255, 255, 0.8);
}

.message-avatar {
    flex-shrink: 0;
    display: flex;
    align-items: flex-start;
}

.message-avatar img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--bg-primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.message-avatar img:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.message-content {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-width: 100%;
    text-align: left;
    position: relative;
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.user-message .message-content:hover {
    box-shadow: var(--shadow-md);
    background-color: var(--bg-hover);
}

.own-message .message-content:hover {
    box-shadow: var(--shadow-md);
    background-color: var(--primary-hover);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
    gap: var(--spacing-md);
}

.message-username {
    font-weight: var(--font-bold);
    color: var(--primary-color);
    font-size: var(--font-sm);
    line-height: 1.3;
}

.message-time {
    font-size: var(--font-xs);
    color: var(--text-muted);
    font-weight: var(--font-medium);
    white-space: nowrap;
}

.message-text {
    color: var(--text-primary);
    line-height: var(--line-height-relaxed);
    word-wrap: break-word;
    font-size: var(--font-base);
    margin: 0;
}

.own-message .message-text {
    color: var(--text-white);
}

/* 聊天输入区域 */
.chat-input-area {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-primary);
    position: relative;
}

.chat-form {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.chat-input-container {
    display: flex;
    flex: 1;
    gap: var(--spacing-sm);
    background-color: var(--bg-white);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    transition: all var(--transition-base);
    will-change: border-color, box-shadow;
    align-items: center;
    flex-wrap: wrap;
}

.chat-input-container:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.chat-input {
    flex: 1;
    border: none;
    padding: var(--spacing-md);
    font-size: var(--font-base);
    background-color: transparent;
    color: var(--text-primary);
    outline: none;
    min-height: 40px;
    resize: none;
    max-height: 120px;
    overflow-y: auto;
    line-height: var(--line-height-relaxed);
}

.chat-input::placeholder {
    color: var(--text-muted);
}

.btn-chat-submit {
    background-color: var(--primary-color);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-base);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    will-change: transform, background-color, box-shadow;
    box-shadow: var(--shadow-sm);
    min-height: 48px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.btn-chat-submit:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-chat-submit:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .chat-welcome {
        padding: var(--spacing-xl);
    }
    
    .welcome-header h1 {
        font-size: var(--font-2xl);
    }
    
    .chat-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn-large {
        justify-content: center;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .chat-container {
        height: calc(100vh - 150px);
    }
    
    .message-content {
        max-width: 85%;
    }
}

@media (max-width: 480px) {
    .chat-welcome {
        padding: var(--spacing-lg);
    }
    
    .chat-actions {
        gap: var(--spacing-md);
    }
    
    .btn-large {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-base);
    }
    
    .chat-container {
        height: calc(100vh - 120px);
    }
    
    .chat-header {
        padding: var(--spacing-md);
    }
    
    .chat-header h2 {
        font-size: var(--font-lg);
    }
    
    .chat-messages {
        padding: var(--spacing-md);
    }
    
    .chat-input-area {
        padding: var(--spacing-md);
    }
}