:root {
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --accent: #60a5fa;
  --muted: #94a3b8;
  --btn: #1f2937;
  --btn-hover: #374151;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #0b1220, #111827);
  color: var(--text);
}

header {
  padding: 24px;
  text-align: center;
}
header h1 {
  margin: 0 0 8px;
  font-size: 28px;
  color: #fff;
}
header p {
  margin: 0;
  color: var(--muted);
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
}

.selectors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
  background: var(--card);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid #1f2937;
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
}

select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #334155;
  background: var(--btn);
  color: var(--text);
}

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: 16px;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 20px;
  color: #fff;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

button {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #334155;
  background: var(--btn);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.04s ease;
}

button:hover { background: var(--btn-hover); }
button:active { transform: scale(0.98); }

.status {
  margin-top: 16px;
  color: var(--muted);
  font-size: 14px;
}