body {
    background-color: #fafafa;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.post-container {
    max-width: 614px;
    margin: 0 auto;
    padding: 20px 0;
}
.post-card {
    background: #fff;
    border: 1px solid #dbdbdb;
    border-radius: 8px;
    margin-bottom: 24px;
    box-shadow: 0 1px 1px rgba(0,0,0,0.04);
}
.post-header {
    padding: 14px 16px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #efefef;
}
.post-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    margin-right: 12px;
    background-color: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
}
.post-username {
    font-weight: 600;
    font-size: 14px;
    color: #262626;
}
.post-time {
    margin-left: auto;
    font-size: 12px;
    color: #8e8e8e;
}
.post-image {
    width: 100%;
    display: block;
}
.post-actions {
    padding: 6px 16px;
    font-size: 24px;
}
.post-action {
    margin-right: 16px;
    cursor: pointer;
}
.post-likes {
    padding: 0 16px;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 8px;
}
.post-caption {
    padding: 0 16px;
    font-size: 14px;
    margin-bottom: 8px;
}
.post-comments {
    padding: 0 16px 8px;
    color: #8e8e8e;
    font-size: 14px;
}
.post-date {
    padding: 0 16px 12px;
    color: #8e8e8e;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.2px;
}
.loading {
    text-align: center;
    padding: 20px;
    color: #999;
    display: none;
}
.activity-badge {
    background-color: #f0f8ff;
    color: #1e90ff;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    margin-left: 8px;
}