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

:root {
    --primary-color: #ff6b35;
    --secondary-color: #f7931e;
    --accent-color: #ffd23f;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --border-color: #e1e8ed;
    --shadow-light: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 16px rgba(0,0,0,0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

/* 导航栏样式 */
.navbar {
    background: var(--bg-primary);
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.brand-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 20px;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background-color: rgba(255, 107, 53, 0.1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.user-avatar img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.user-avatar img:hover {
    transform: scale(1.05);
}

/* 主要内容区域 */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
}

/* 侧边栏样式 */
.sidebar {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow-light);
    height: fit-content;
}

.sidebar-section {
    margin-bottom: 32px;
}

.sidebar-section h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

.circle-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.circle-item:hover {
    background-color: var(--bg-secondary);
}

.circle-item img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

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

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

.user-item img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.user-info {
    flex: 1;
}

.username {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
}

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

.follow-btn {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 6px 16px;
    border-radius: 16px;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

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

/* 内容区域样式 */
.content-area {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
}

/* 发布框样式 */
.post-composer {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.composer-header {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.composer-header img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.composer-textarea {
    flex: 1;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    resize: none;
    font-family: inherit;
    font-size: 16px;
    min-height: 80px;
    transition: var(--transition);
}

.composer-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.composer-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.composer-tools {
    display: flex;
    gap: 16px;
}

.tool-btn {
    background: transparent;
    border: none;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.tool-btn:hover {
    background-color: var(--bg-secondary);
}

.tool-btn span {
    font-size: 20px;
    display: block;
}

.btn-post {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 32px;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-post:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* 动态列表样式 */
.feed-container {
    padding: 0 24px;
}

.feed-item {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.feed-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.feed-header .user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.user-info {
    flex: 1;
}

.username {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.post-time {
    font-size: 14px;
    color: var(--text-light);
}

.feed-content {
    margin-bottom: 16px;
}

.feed-content p {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.feed-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.feed-images img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.feed-images img:hover {
    transform: scale(1.02);
}

.feed-actions {
    display: flex;
    gap: 24px;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 20px;
    transition: var(--transition);
}

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

.action-btn span {
    font-size: 16px;
    display: block;
}

.like-btn.liked {
    color: var(--primary-color);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}