* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1677ff;
    --primary-bg: #e6f4ff;
    --bg-gray: #f5f7fa;
    --bg-white: #ffffff;
    --text-primary: #1d2129;
    --text-secondary: #4e5969;
    --text-tertiary: #86909c;
    --border-color: #e5e6eb;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --nav-item-height: 40px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--bg-gray);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 24px;
    min-height: calc(100vh - 140px);
}

.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-dropdown {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: background 0.2s;
}

.user-dropdown:hover {
    background: var(--bg-gray);
}

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

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 160px;
    padding: 8px 0;
    display: none;
    z-index: 1000;
    margin-top: 4px;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.2s;
}

.dropdown-menu a:hover {
    background: var(--bg-gray);
}

.btn {
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #4096ff;
}

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

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

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

.sidebar-section {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-sm);
}

.sidebar-section h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.15s;
    height: var(--nav-item-height);
}

.nav-item:hover {
    background: var(--bg-gray);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-bg);
    color: var(--primary-color);
    font-weight: 500;
}

.tag-cloud {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.tag-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.15s;
}

.tag-item:hover {
    background: var(--bg-gray);
    color: var(--text-primary);
}

.tag-name {
    font-weight: 400;
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.user-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: background 0.15s;
}

.user-item:hover {
    background: var(--bg-gray);
}

.user-info {
    flex: 1;
    min-width: 0;
}

.username {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.user-role {
    font-size: 12px;
    color: var(--text-tertiary);
}

.main-content {
    min-height: 100%;
}

.content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.posts-feed {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.post-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.post-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.post-card:hover {
    box-shadow: var(--shadow-md);
}

.post-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.post-author-avatar-link {
    display: inline-block;
    text-decoration: none;
    flex-shrink: 0;
}

.post-meta-info {
    flex: 1;
    min-width: 0;
}

.post-author {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    display: block;
}

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

.post-time {
    font-size: 13px;
    color: var(--text-tertiary);
}

.post-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.post-thumbnail-link {
    display: block;
    text-decoration: none;
    margin: 12px 0;
}

.post-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    background: var(--bg-gray);
}

.post-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.post-stats {
    display: flex;
    gap: 24px;
    color: var(--text-tertiary);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
}

.icon-like::before {
    content: '👍';
}

.icon-comment::before {
    content: '💬';
}

.icon-eye::before {
    content: '👁';
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 14px;
}

.footer {
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: 48px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 13px;
}

.footer-content a {
    color: var(--text-secondary);
    text-decoration: none;
}

.post-images {
    margin: 20px 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.post-image-link {
    display: block;
    text-decoration: none;
}

.post-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    background: var(--bg-gray);
    cursor: pointer;
    transition: transform 0.2s;
}

.post-image:hover {
    transform: scale(1.02);
}

.post-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.post-thumbnail-small-link {
    display: block;
    text-decoration: none;
    margin: 10px 0;
}

.post-thumbnail-small {
    width: 100%;
    max-height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    background: var(--bg-gray);
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
        padding: 16px;
    }
    
    .sidebar {
        order: 2;
    }
    
    .main-content {
        order: 1;
    }
    
    .header-content {
        padding: 0 16px;
    }
    
    .post-card {
        padding: 16px;
    }
}