body {
  margin:0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Arial;
  background:#0f172a;
  color:#f8fafc;
}

.topbar {
  padding:15px 20px;
  background:#111827;
}

.logo {
  text-decoration:none;
  color:#60a5fa;
  font-weight:700;
  font-size:20px;
}

.container {
  max-width:820px;
  margin:auto;
  padding:30px 20px;
}

h1 { margin-top:0; }

.subtle { color:#94a3b8; }
.small { font-size:14px; }

.card {
  background:#1e293b;
  border:1px solid #334155;
  padding:20px;
  border-radius:14px;
  margin-bottom:18px;
}

.option-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(120px,1fr));
  gap:10px;
}

.option-grid button {
  background:#334155;
  border:1px solid #475569;
  color:#f8fafc;
  padding:14px;
  border-radius:10px;
  cursor:pointer;
  font-weight:600;
}

.option-grid button.selected {
  background:#2563eb;
  border-color:#60a5fa;
}

.primary-btn, .exit-btn {
  display:inline-block;
  margin-top:10px;
  background:#2563eb;
  color:white;
  padding:14px 20px;
  border-radius:10px;
  text-decoration:none;
  font-weight:600;
  border:none;
  cursor:pointer;
}

.primary-btn:disabled {
  background:#334155;
  color:#64748b;
}