:root{--bg:#f8fafc;--card:#ffffff;--line:#e5e7eb;--muted:#6b7280;--accent:#2563eb;--ok:#16a34a;--warn:#ef4444;}
  *{box-sizing:border-box;}
  body{margin:0;background:var(--bg);color:#0f172a;font-family:"Inter","Segoe UI",system-ui,-apple-system,sans-serif;}
  .wrap{max-width:920px;margin:0 auto;padding:20px;}
  .backLink{margin-bottom:12px;}
  .backBtn{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;color:#0f172a;font-weight:700;text-decoration:none;}
  h1{margin:6px 0 14px;font-size:24px;font-weight:800;}
  .card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:0 12px 24px rgba(0,0,0,.06);}
  .controls{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px;}
  .tabs{display:flex;gap:8px;flex-wrap:wrap;margin:6px 0 12px;}
  .tab-btn{border:1px solid var(--line);background:#fff;color:#0f172a;padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700;cursor:pointer;}
  .tab-btn.active{background:#eef2ff;border-color:#c7d2fe;color:#1d4ed8;box-shadow:0 6px 14px rgba(37,99,235,.15);}
  .tab-hint{font-size:12px;color:var(--muted);margin-top:4px;}
  .controls input{padding:10px 12px;border:1px solid var(--line);border-radius:10px;flex:1;min-width:220px;}
  .controls button{padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;font-weight:700;cursor:pointer;}
  .list{display:grid;gap:10px;}
  .coupon{border:1px solid var(--line);border-radius:12px;padding:12px;background:#fff;display:grid;gap:6px;grid-template-columns:1fr;}
  @media(min-width:640px){.coupon{grid-template-columns:1fr auto;align-items:center;}}
  .coupon h3{margin:0;font-size:16px;font-weight:800;}
  .muted{color:var(--muted);font-size:13px;}
  .chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:#eef2ff;border:1px solid #c7d2fe;font-size:12px;color:#1d4ed8;font-weight:700;}
  .chip.ok{background:#dcfce7;border-color:#16a34a;color:#166534;}
  .chip.warn{background:#fee2e2;border-color:#fca5a5;color:#b91c1c;}
  .actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end;}
  .btn{border:1px solid var(--line);background:#fff;color:#0f172a;padding:8px 10px;border-radius:10px;font-weight:700;cursor:pointer;}
  .btn.primary{background:linear-gradient(135deg,#2563eb,#1d4ed8);border-color:#1d4ed8;color:#fff;}