:root{--primary:#0d6efd;--bg:#f7f8fa;--text:#212529}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.card{box-shadow:0 .5rem 1rem rgba(0,0,0,.05);border:1px solid #eee}.feed-post{border-bottom:1px solid #eee;padding:12px 0}.feed-post .meta{color:#6c757d;font-size:.9rem}img.preview{max-width:100%;border-radius:8px;border:1px solid #eee;margin-top:6px}.btn-like.active{background:var(--primary);color:#fff}