:root{
    --bg:#0f1724;
    --card:#0b1220;
    --accent:#ff6b6b;
    --muted:#9aa4b2;
    --glass: rgba(255,255,255,0.03);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  }
  *{box-sizing:border-box}
  html,body{height:100%;margin:0;background:linear-gradient(180deg,#071024 0%, #0f1724 100%);color:#e6eef6;-webkit-font-smoothing:antialiased}
  .app{
    max-width:900px;margin:0 auto;padding:18px;display:flex;flex-direction:column;gap:14px;min-height:100vh;
  }
  header{display:flex;align-items:center;justify-content:space-between;gap:12px}
  .brand{display:flex;gap:12px;align-items:center}
  .logo{
    width:56px;height:56px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#ff9a6b);display:flex;align-items:center;justify-content:center;font-weight:700;color:#111;
    box-shadow:0 6px 22px rgba(0,0,0,0.5);
  }
  h1{font-size:18px;margin:0}
  p.lead{margin:0;color:var(--muted);font-size:13px}
  main{display:flex;flex-direction:column;gap:12px}
  .controls{display:flex;gap:8px;flex-wrap:wrap}
  .btn{
    background:var(--card);border:1px solid rgba(255,255,255,0.04);padding:10px 12px;border-radius:10px;color:inherit;font-weight:600;cursor:pointer;
    box-shadow: 0 4px 12px rgba(2,6,23,0.6);
  }
  .mode-btn{transition:transform .12s}
  .mode-btn.active{transform:translateY(-4px);background:linear-gradient(90deg,#121826, rgba(255,255,255,0.02));border:1px solid rgba(255,255,255,0.06)}
  .big-card{background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);border-radius:16px;padding:18px;border:1px solid rgba(255,255,255,0.03);display:flex;flex-direction:column;gap:12px}
  .prompt{min-height:120px;display:flex;align-items:center;justify-content:center;text-align:center;padding:12px;border-radius:12px;font-size:18px}
  .meta{display:flex;gap:8px;align-items:center;justify-content:space-between;flex-wrap:wrap}
  .actions{display:flex;gap:8px;align-items:center}
  .btn.primary{background:linear-gradient(90deg,var(--accent),#ff9a6b);color:#111;border:none}
  .btn.ghost{background:transparent;border:1px dashed rgba(255,255,255,0.06);padding:8px 10px;font-weight:600}
  .small{font-size:13px;padding:8px 10px;border-radius:9px}
  .players{display:flex;gap:8px;align-items:center}
  input[type="text"]{background:var(--glass);border:1px solid rgba(255,255,255,0.03);padding:10px;border-radius:10px;color:inherit;outline:none}
  .player-list{display:flex;gap:8px;flex-wrap:wrap}
  .player-pill{background:rgba(255,255,255,0.03);padding:8px 10px;border-radius:999px;font-weight:600;border:1px solid rgba(255,255,255,0.02)}
  footer{margin-top:auto;color:var(--muted);font-size:13px;text-align:center;padding:14px 8px}
  /* modal */
  .modal-back{position:fixed;inset:0;background:rgba(0,0,0,0.6);display:none;align-items:center;justify-content:center;padding:18px;z-index:50}
  .modal{background:linear-gradient(180deg,#081426,#071227);padding:18px;border-radius:14px;max-width:520px;width:100%;border:1px solid rgba(255,255,255,0.04)}
  .row{display:flex;gap:8px;align-items:center}
  .muted{color:var(--muted);font-size:13px}
  /* responsiveness */
  @media (max-width:520px){
    .brand h1{font-size:16px}
    .prompt{font-size:16px}
    .logo{width:48px;height:48px}
  }
  /* small helpful UI */
  .chip{background:rgba(255,255,255,0.03);padding:6px 8px;border-radius:999px;font-size:13px;border:1px solid rgba(255,255,255,0.02)}
  .danger{background:linear-gradient(90deg,#ff6b6b,#ff9a6b);color:#111}
  .result-history{display:flex;flex-direction:column;gap:6px;max-height:160px;overflow:auto;padding-right:6px}
  .hist-item{background:rgba(255,255,255,0.02);padding:8px;border-radius:8px;font-size:13px;border:1px solid rgba(255,255,255,0.02)}