:root {
    --primary-color: #1DA1F2;
    --primary-dark: #1a91da;
    --secondary-color: #657786;
    --background-color: #F5F8FA;
    --card-background: #FFFFFF;
    --text-color: #14171A;
    --border-color: #E6ECF0;
    --hover-color: #F0F2F5;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 导航栏样式 */
.navbar {
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: var(--primary-color);
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

/* 主内容区样式 */
.content-wrapper {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

/* 侧边栏样式 */
.sidebar {
    width: 260px;
    flex-shrink: 0;
}

.profile-card {
    background-color: var(--card-background);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
}

.profile-img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 10px;
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: transform 0.2s ease;
}

.profile-img:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.sidebar-menu {
    background-color: var(--card-background);
    border-radius: 15px;
    overflow: hidden;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 20px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 18px;
    border-radius: 20px;
    margin: 0 5px;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background-color: rgba(29, 161, 242, 0.1);
    color: var(--primary-color);
}

/* 主内容样式 */
.main-content {
    flex-grow: 1;
    max-width: 600px;
}

.post-box {
    background-color: var(--card-background);
    border-radius: 20px;
    padding: 18px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border: 1px solid var(--border-color);
}

.post-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    cursor: pointer;
    transition: all 0.2s ease;
}

.post-avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.post-form {
    margin-left: 15px;
    flex-grow: 1;
}

.post-form textarea {
    width: 100%;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 12px 15px;
    color: var(--text-color);
    resize: none;
    min-height: 100px;
    font-size: 15px;
    margin-bottom: 10px;
}

.post-actions {
    display: flex;
    justify-content: flex-end;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 25px;
    padding: 10px 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.article-card {
    background-color: var(--card-background);
    border-radius: 20px;
    padding: 18px;
    display: flex;
    gap: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border: 1px solid var(--border-color);
    margin-bottom: 15px;
}

.article-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.article-content {
    flex-grow: 1;
}

.article-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.article-author {
    font-weight: bold;
    margin: 0;
}

.article-date {
    color: var(--secondary-color);
    font-size: 14px;
}

.article-title {
    margin: 5px 0;
    font-size: 18px;
}

.article-body {
    margin-bottom: 10px;
    font-size: 15px;
    line-height: 1.5;
}

.article-actions {
    display: flex;
    gap: 20px;
}

.article-actions a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.article-actions a:hover {
    color: var(--primary-color);
}

/* 右侧边栏 */
.search-box {
    background-color: var(--background-color);
    border-radius: 25px;
    padding: 12px 18px;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.search-box input {
    background: transparent;
    border: none;
    color: var(--text-color);
    flex-grow: 1;
    outline: none;
    font-size: 15px;
}

.post-title {
    font-size: 22px;
    padding: 10px;
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.trending-box {
    background-color: var(--card-background);
    border-radius: 20px;
    padding: 18px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border: 1px solid var(--border-color);
}

.trending-box h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 20px;
}

.trending-topics {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.trending-topic {
    color: var(--text-color);
    text-decoration: none;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.trending-topic:last-child {
    border-bottom: none;
}

.trending-topic:hover {
    color: var(--primary-color);
}

/* 页脚样式 */
.footer {
    margin-top: 40px;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-bottom: 15px;
}

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

.footer p {
    color: var(--secondary-color);
    text-align: center;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .right-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .left-sidebar {
        display: none;
    }
    .main-content {
        max-width: 100%;
    }
}