:root{
  --bg:#f5f7fb;
  --surface:#ffffff;
  --text:#1f2937;
  --muted:#6b7280;
  --border:#e5e7eb;
  --primary:#2563eb;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto}
.topbar{position:sticky;top:0;z-index:10;background:var(--surface);border-bottom:1px solid var(--border);display:flex;gap:12px;align-items:center;justify-content:space-between;padding:12px 16px}
.container{max-width:1100px;margin:20px auto;padding:0 16px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:14px}
.composer h2{margin:0 0 8px}
.row{margin:8px 0;display:flex;gap:8px}
.row.right{justify-content:flex-end}
input,textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:#fff}
.btn{padding:8px 12px;border:1px solid var(--border);border-radius:10px;background:#fff;cursor:pointer}
.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn:disabled{opacity:.6;cursor:not-allowed}
.feed{display:flex;flex-direction:column;gap:12px;margin-top:16px}
.post{padding:14px;border-radius:14px;border:1px solid var(--border);background:#fff}
.post .meta{display:flex;gap:10px;align-items:center;color:var(--muted);margin-bottom:6px}
.post .actions{display:flex;gap:14px;align-items:center;margin-top:10px;color:var(--muted)}
.icon{display:inline-flex;align-items:center;gap:6px;cursor:default}
.icon.btn{cursor:pointer;border:none;background:transparent;padding:6px 8px;border-radius:8px}
.icon.btn:hover{background:#f1f5f9}
.muted{color:var(--muted);margin:6px 0 0}