/* =====================================================
   智享科技论坛 - 主样式表
   设计理念：现代不对称UI + 圆角效果
   色彩方案：青色/蓝色系（避免紫色）
   ===================================================== */

/* CSS 变量定义 */
:root {
    /* 主题色 - 青色系 */
    --primary-color: #00D4AA;
    --primary-hover: #00B894;
    --primary-light: rgba(0, 212, 170, 0.1);
    --primary-gradient: linear-gradient(135deg, #00D4AA, #00A8E8);
    
    /* 辅助色 */
    --secondary-color: #00A8E8;
    --accent-color: #FF6B6B;
    --warning-color: #F4A100;
    --success-color: #2ECC71;
    --danger-color: #E74C3C;
    
    /* 中性色 */
    --text-primary: #1a1a2e;
    --text-secondary: #5c6b7a;
    --text-muted: #8896a4;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafb;
    --bg-tertiary: #f0f3f5;
    --border-color: #e8ecf0;
    --border-light: #f0f3f5;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12), 0 4px 8px rgba(0, 0, 0, 0.06);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15), 0 8px 16px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 20px rgba(0, 212, 170, 0.25);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    
    /* 尺寸 */
    --header-height: 64px;
    --container-width: 1280px;
}

/* 暗色主题变量 */
body.theme-dark {
    --text-primary: #e8ecf0;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --bg-primary: #13151a;
    --bg-secondary: #1a1d24;
    --bg-tertiary: #22262f;
    --border-color: #2d3340;
    --border-light: #262c38;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
}

/* 基础重置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ==================== 头部导航 ==================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all var(--transition-normal);
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 32px;
}

.logo-section {
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--text-primary);
}

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

.logo-text {
    letter-spacing: -0.02em;
}

.logo-highlight {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    margin-left: 20px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.nav-link.active {
    color: var(--primary-color);
    background: var(--primary-light);
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* 按钮样式 */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: var(--shadow-sm), 0 2px 8px rgba(0, 212, 170, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(0, 212, 170, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

/* 图标按钮 */
.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.icon-btn-wrapper {
    position: relative;
}

.notification-btn,
.message-btn {
    position: relative;
}

.badge {
    position: absolute;
    top: 4px;
    right: 4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.badge-notification {
    background: var(--accent-color);
    animation: pulse-badge 2s infinite;
}

.badge-message {
    background: var(--secondary-color);
}

@keyframes pulse-badge {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* 用户下拉菜单 */
.user-dropdown {
    position: relative;
}

.user-avatar-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px 4px 4px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-avatar-btn:hover {
    border-color: var(--primary-color);
}

.user-avatar-small {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--bg-primary);
}

.dropdown-arrow {
    font-size: 10px;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.user-dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 240px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 1100;
}

.user-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
}

.user-avatar-medium {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    object-fit: cover;
}

.dropdown-user-name {
    font-weight: 600;
    font-size: 15px;
}

.dropdown-user-level {
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 500;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0 12px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    width: 100%;
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.dropdown-item.highlight {
    color: var(--primary-color);
}

.dropdown-item.logout-item {
    color: var(--danger-color);
}

.dropdown-item.logout-item:hover {
    background: rgba(231, 76, 60, 0.08);
}

/* 主题切换按钮 */
.theme-toggle .theme-icon-light {
    display: none;
}

body.theme-dark .theme-icon-dark {
    display: none;
}

body.theme-dark .theme-icon-light {
    display: inline-block;
}

/* 移动端菜单 */
.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 20px;
}

.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 85vw;
    height: 100%;
    background: var(--bg-primary);
    padding: 24px;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
}

.mobile-menu-overlay.active .mobile-menu-content {
    transform: translateX(0);
}

.mobile-menu-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
}

.mobile-user-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 30px 0 20px;
    border-bottom: 1px solid var(--border-color);
}

.mobile-user-avatar {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    object-fit: cover;
}

.mobile-user-name {
    font-weight: 600;
    font-size: 18px;
}

.mobile-user-level {
    font-size: 13px;
    color: var(--primary-color);
}

.mobile-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    margin-top: 20px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    color: #fff;
    font-weight: 600;
    font-size: 15px;
}

.mobile-auth-buttons {
    display: flex;
    gap: 12px;
    padding: 20px 0;
}

.mobile-auth-buttons .btn-block {
    flex: 1;
    text-align: center;
    justify-content: center;
}

.mobile-nav {
    padding: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

/* ==================== 主内容区 ==================== */
.main-container {
    max-width: var(--container-width);
    margin: calc(var(--header-height) + 24px) auto 40px;
    padding: 0 24px;
    min-height: calc(100vh - var(--header-height) - 80px);
}

/* 不对称布局容器 */
.layout-asymmetric {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 28px;
    align-items: start;
}

.layout-main {
    width: 100%;
}

.layout-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 24px);
}

/* ==================== 卡片组件 ==================== */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.card-title {
    font-size: 17px;
    font-weight: 650;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

.card-footer {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

/* ==================== 帖子列表卡片 ==================== */
.post-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 18px;
}

.post-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.post-card:hover {
    border-color: rgba(0, 212, 170, 0.3);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

.post-card.pinned {
    border-left: 4px solid var(--warning-color);
}

.post-card.featured {
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(0, 212, 170, 0.03) 100%);
}

/* 帖子分类标签 */
.post-category-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    background: var(--primary-light);
    color: var(--primary-color);
}

.post-type-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    margin-left: 8px;
}

.post-type-badge.type-tech { background: rgba(0, 168, 232, 0.1); color: #00A8E8; }
.post-type-badge.type-help { background: rgba(255, 161, 0, 0.1); color: #F4A100; }
.post-type-badge.type-share { background: rgba(46, 204, 113, 0.1); color: #2ECC71; }
.post-type-badge.type-topic { background: rgba(255, 107, 107, 0.1); color: #FF6B6B; }
.post-type-badge.type-resource { background: rgba(155, 89, 182, 0.1); color: #9B59B6; }

/* 帖子标题 */
.post-title {
    font-size: 17px;
    font-weight: 650;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 8px;
    display: block;
    transition: color var(--transition-fast);
}

.post-title:hover {
    color: var(--primary-color);
}

.post-title .pin-icon {
    color: var(--warning-color);
    margin-right: 6px;
}

.post-title .featured-icon {
    color: var(--primary-color);
    margin-right: 6px;
}

.post-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

/* 帖子元信息 */
.post-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.post-author {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.post-author:hover {
    color: var(--primary-color);
}

.post-author-avatar {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.post-stats {
    display: flex;
    align-items: center;
    gap: 14px;
}

.post-stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 13px;
    transition: color var(--transition-fast);
}

.post-stat-item:hover {
    color: var(--primary-color);
}

.post-stat-item.liked {
    color: var(--accent-color);
}

.post-stat-item.collected {
    color: var(--warning-color);
}

/* 帖子封面图 */
.post-cover {
    width: 160px;
    height: 110px;
    border-radius: var(--radius-md);
    object-fit: cover;
    flex-shrink: 0;
}

/* 用户头像信息区域 */
.post-author-section {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 12px;
}

.post-author-avatar-large {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.author-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.author-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.author-meta {
    font-size: 12px;
    color: var(--text-muted);
}

/* 标签 */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-light);
    color: var(--primary-color);
}

/* ==================== 侧边栏 ==================== */
.sidebar-widget {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 20px;
    transition: all var(--transition-normal);
}

.sidebar-widget:hover {
    border-color: rgba(0, 212, 170, 0.2);
}

.widget-title {
    font-size: 15px;
    font-weight: 650;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.widget-title i {
    color: var(--primary-color);
}

/* 热门帖子侧边栏 */
.hot-post-list {
    list-style: none;
}

.hot-post-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

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

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

.hot-post-rank {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.hot-post-rank.rank-1 { background: linear-gradient(135deg, #FFD700, #FFA500); color: #fff; }
.hot-post-rank.rank-2 { background: linear-gradient(135deg, #C0C0C0, #A0A0A0); color: #fff; }
.hot-post-rank.rank-3 { background: linear-gradient(135deg, #CD7F32, #B87333); color: #fff; }

.hot-post-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--transition-fast);
}

.hot-post-title:hover {
    color: var(--primary-color);
}

/* 活跃用户 */
.active-users-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.active-user-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    width: calc(33.333% - 7px);
}

.active-user-item:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.active-user-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    object-fit: cover;
    border: 2px solid var(--border-color);
    transition: border-color var(--transition-fast);
}

.active-user-item:hover .active-user-avatar {
    border-color: var(--primary-color);
}

.active-user-name {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: center;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 分类快捷入口 */
.category-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.category-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.category-chip:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-light);
    transform: translateY(-1px);
}

/* ==================== 表单样式 ==================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

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

/* 富文本编辑器容器 */
.editor-wrapper {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.editor-wrapper:focus-within {
    border-color: var(--primary-color);
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.editor-toolbar button {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
}

.editor-toolbar button:hover {
    background: var(--bg-primary);
    color: var(--primary-color);
}

.editor-toolbar button.active {
    background: var(--primary-light);
    color: var(--primary-color);
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 6px;
}

.editor-content {
    min-height: 250px;
    padding: 16px;
    outline: none;
    font-size: 15px;
    line-height: 1.8;
}

.editor-content:empty:before {
    content: attr(data-placeholder);
    color: var(--text-muted);
}

/* ==================== 分页 ==================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 32px;
    padding: 16px 0;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.page-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-link.active {
    background: var(--primary-gradient);
    color: #fff;
    border-color: transparent;
}

.page-ellipsis {
    color: var(--text-muted);
    padding: 0 4px;
}

/* ==================== 提示框 ==================== */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 14px;
    animation: slideInDown 0.3s ease;
}

.alert-success {
    background: rgba(46, 204, 113, 0.1);
    color: #27ae60;
    border: 1px solid rgba(46, 204, 113, 0.2);
}

.alert-danger {
    background: rgba(231, 76, 60, 0.1);
    color: #c0392b;
    border: 1px solid rgba(231, 76, 60, 0.2);
}

.alert-warning {
    background: rgba(244, 161, 0, 0.1);
    color: #d68910;
    border: 1px solid rgba(244, 161, 0, 0.2);
}

.alert-info {
    background: rgba(0, 168, 232, 0.1);
    color: #2980b9;
    border: 1px solid rgba(0, 168, 232, 0.2);
}

.close-alert {
    margin-left: auto;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
    line-height: 1;
}

.close-alert:hover {
    opacity: 1;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 页脚 ==================== */
.main-footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

.footer-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 50px 24px 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section {
}

.footer-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    position: relative;
}

.footer-title::after {
    content: '';
    display: block;
    width: 30px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
    margin-top: 8px;
}

.footer-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.social-links {
    display: flex;
    gap: 10px;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 18px;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-gradient);
    color: #fff;
    transform: translateY(-3px);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.footer-links a:hover {
    color: var(--primary-color);
    transform: translateX(4px);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--border-light);
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    font-size: 13px;
    color: var(--text-muted);
}

.footer-stats {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

.footer-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.footer-stats strong {
    color: var(--primary-color);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 900;
    font-size: 18px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ==================== 登录/注册页面 ==================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.auth-page::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 70%;
    height: 140%;
    background: var(--primary-gradient);
    opacity: 0.05;
    border-radius: 50%;
    transform: rotate(-15deg);
}

.auth-container {
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 1;
}

.auth-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.auth-header {
    text-align: center;
    margin-bottom: 36px;
}

.auth-logo {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-logo svg {
    width: 100%;
    height: 100%;
}

.auth-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.auth-subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    margin-top: 8px;
}

.auth-footer {
    text-align: center;
    margin-top: 28px;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 600;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ==================== 个人主页 ==================== */
.profile-header {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 36px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}

.profile-header-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 140px;
    background: var(--primary-gradient);
    opacity: 0.1;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.profile-info {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    position: relative;
    z-index: 1;
}

.profile-avatar {
    width: 96px;
    height: 96px;
    border-radius: var(--radius-lg);
    object-fit: cover;
    border: 4px solid var(--bg-primary);
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.profile-details {
    flex: 1;
}

.profile-name {
    font-size: 24px;
    font-weight: 750;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.profile-bio {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 10px 0;
}

.profile-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}

.profile-stats-bar {
    display: flex;
    gap: 32px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
}

.profile-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile-stat-value {
    font-size: 22px;
    font-weight: 750;
    color: var(--text-primary);
}

.profile-stat-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

.profile-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
}

/* Tab 导航 */
.tab-navigation {
    display: flex;
    gap: 4px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 6px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    overflow-x: auto;
}

.tab-link {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.tab-link.active {
    background: var(--primary-gradient);
    color: #fff;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* ==================== 评论区域 ==================== */
.comment-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.comment-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.comment-item {
    display: flex;
    gap: 14px;
    padding: 18px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.comment-item:hover {
    border-color: rgba(0, 212, 170, 0.2);
}

.comment-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    object-fit: cover;
    flex-shrink: 0;
}

.comment-body {
    flex: 1;
    min-width: 0;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
    flex-wrap: wrap;
}

.comment-username {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.comment-time {
    font-size: 12px;
    color: var(--text-muted);
}

.comment-content {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.comment-actions {
    display: flex;
    gap: 16px;
    margin-top: 10px;
}

.comment-action-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.comment-action-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.comment-action-btn.liked {
    color: var(--accent-color);
}

/* 回复嵌套 */
.replies-container {
    margin-left: 54px;
    margin-top: 12px;
    padding-left: 16px;
    border-left: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.reply-item {
    display: flex;
    gap: 10px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.reply-item .comment-avatar {
    width: 28px;
    height: 28px;
}

/* 评论输入框 */
.comment-form {
    margin-top: 24px;
}

.comment-input-wrapper {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.comment-input-wrapper textarea {
    flex: 1;
    min-height: 80px;
}

/* ==================== 消息通知 ==================== */
.notification-list {
    display: flex;
    flex-direction: column;
}

.notification-item {
    display: flex;
    gap: 14px;
    padding: 16px 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.notification-item.unread {
    border-left: 4px solid var(--primary-color);
    background: rgba(0, 212, 170, 0.03);
}

.notification-item:hover {
    border-color: rgba(0, 212, 170, 0.3);
    transform: translateX(4px);
}

.notification-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
    font-size: 16px;
}

.notification-icon.type-comment { background: rgba(0, 168, 232, 0.1); color: #00A8E8; }
.notification-icon.type-like { background: rgba(255, 107, 107, 0.1); color: #FF6B6B; }
.notification-icon.type-follow { background: rgba(0, 212, 170, 0.1); color: #00D4AA; }
.notification-icon.type-system { background: rgba(155, 89, 182, 0.1); color: #9B59B6; }

.notification-content {
    flex: 1;
    min-width: 0;
}

.notification-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.notification-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

.notification-time {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ==================== 搜索页面 ==================== */
.search-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 30px;
    margin-bottom: 24px;
}

.search-form {
    display: flex;
    gap: 12px;
}

.search-input-wrapper {
    flex: 1;
    position: relative;
}

.search-input-wrapper i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-input {
    width: 100%;
    padding: 14px 16px 14px 46px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: all var(--transition-fast);
    outline: none;
}

.search-input:focus {
    border-color: var(--primary-color);
    background: var(--bg-primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.search-filters {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.filter-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-chip:hover,
.filter-chip.active {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--primary-light);
}

/* ==================== 公告横幅 ==================== */
.announcement-banner {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.08) 0%, rgba(0, 168, 232, 0.08) 100%);
    border: 1px solid rgba(0, 212, 170, 0.2);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.announcement-banner:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.announcement-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    color: #fff;
    font-size: 18px;
    flex-shrink: 0;
}

.announcement-content {
    flex: 1;
    min-width: 0;
}

.announcement-tag {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.announcement-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    background: var(--bg-tertiary);
    font-size: 42px;
    color: var(--text-muted);
}

.empty-state-title {
    font-size: 18px;
    font-weight: 650;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state-desc {
    font-size: 14px;
    color: var(--text-secondary);
    max-width: 360px;
    margin: 0 auto 24px;
}

/* ==================== 加载动画 ==================== */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

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

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .layout-asymmetric {
        grid-template-columns: 1fr;
    }

    .layout-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 16px;
    }

    .sidebar-widget {
        margin-bottom: 0;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

    .nav-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .header-actions .btn-secondary span,
    .header-actions .btn-primary span,
    .btn-publish span {
        display: none;
    }

    .main-container {
        margin-top: calc(var(--header-height) + 16px);
        padding: 0 16px;
    }

    .auth-card {
        padding: 32px 24px;
    }

    .post-card {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .post-cover {
        width: 100%;
        height: 180px;
        order: -1;
    }

    .profile-header {
        padding: 24px;
    }

    .profile-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-stats-bar {
        justify-content: center;
    }

    .profile-actions {
        align-items: center;
        flex-direction: row;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .search-form {
        flex-direction: column;
    }

    .replies-container {
        margin-left: 0;
        padding-left: 12px;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 16px;
    }

    .post-card {
        padding: 14px;
    }

    .post-title {
        font-size: 15px;
    }

    .tab-link {
        padding: 8px 14px;
        font-size: 13px;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .active-users-list {
        justify-content: center;
    }
}