.gv-osw{
  --c-text:#111827;--c-muted:#6b7280;--c-primary:#2563eb;--c-danger:#dc2626;--c-border:#e5e7eb;--c-bg:#fff;
  background:var(--c-bg);color:var(--c-text);
  border:1px solid var(--c-border);
  /* khung bo to & rộng hơn */
  border-radius:24px;
  padding:28px;
  max-width:860px;
  margin:28px auto;
  box-shadow:0 10px 32px rgba(0,0,0,.06);
  font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;
}

.gv-osw__display{
  font-variant-numeric:tabular-nums;
  font-size:44px;
  font-weight:800;
  text-align:center;
  padding:20px 14px;
  border:1px dashed var(--c-border);
  border-radius:16px;
  margin-bottom:16px;
  letter-spacing:1px;
  user-select:none;
}

.gv-osw__controls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:16px}
.gv-osw__btn{border:1px solid var(--c-border);background:#f8fafc;padding:10px 16px;border-radius:12px;font-weight:600;cursor:pointer}
.gv-osw__btn:disabled{opacity:.5;cursor:not-allowed}
.gv-osw__btn--primary{background:#eff6ff;border-color:#bfdbfe;color:#1d4ed8}
.gv-osw__btn--danger{background:#fef2f2;border-color:#fecaca;color:#b91c1c}
.gv-osw__btn--outline{background:#fff;border-color:#94a3b8;color:#0f172a}

.gv-osw__advanced{border-top:1px dashed var(--c-border);margin-top:14px;padding-top:10px}
.gv-osw__summary{cursor:pointer;font-weight:700}
.gv-osw__settings{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin-top:8px}
.gv-osw__select,.gv-osw__range{padding:8px 10px;border:1px solid var(--c-border);border-radius:10px;background:#fff}

.gv-osw__laps{margin-top:10px}
.gv-osw__laps table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.gv-osw__laps th,.gv-osw__laps td{padding:8px 10px;border-bottom:1px solid var(--c-border);text-align:left}
.gv-osw__laps th{background:#f9fafb}

/* History */
.gv-osw__history{margin-top:18px}
.gv-osw__h3{margin:0 0 8px;font-size:18px}
.gv-osw__history-tablewrap{overflow:auto;border:1px solid var(--c-border);border-radius:14px}
.gv-osw__table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.gv-osw__table th,.gv-osw__table td{padding:10px 12px;border-bottom:1px solid var(--c-border);white-space:nowrap}
.gv-osw__table thead th{background:#f8fafc;color:#374151;text-align:left;font-weight:700}
.gv-osw__table tbody tr:last-child td{border-bottom:none}
.gv-osw__rowdel{cursor:pointer;font-weight:700;opacity:.6}
.gv-osw__rowdel:hover{opacity:1}

.gv-osw__history-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:flex-start;margin-top:12px}

@media (max-width:480px){
  .gv-osw{padding:18px;border-radius:18px;max-width:100%}
  .gv-osw__display{font-size:36px}
}