:root {
  --bg: #0b0f1a;
  --card: #12182b;
  --primary: #4da3ff;
  --text: #eaeaf0;
  --muted: #9aa4bf;
}

* {
  box-sizing: border-box;
  font-family: Inter, system-ui, sans-serif;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.header {
  background: linear-gradient(135deg, #10162f, #0b0f1a);
  padding: 32px 16px;
  text-align: center;
}

.header-inner {
  max-width: 720px;
  margin: auto;
}

.logo {
  width: 72px;
  margin-bottom: 12px;
}

.header h1 {
  margin: 8px 0;
  font-size: 1.8rem;
}

.header p {
  color: var(--muted);
}

.container {
  max-width: 900px;
  margin: 32px auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.card {
  background: var(--card);
  padding: 20px;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

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

select, button {
  width: 100%;
  padding: 12px;
  margin-bottom: 16px;
  border-radius: 10px;
  border: none;
  font-size: 1rem;
}

select {
  background: #1a2140;
  color: var(--text);
}

button {
  background: var(--primary);
  color: #000;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

pre {
  background: #0b0f1a;
  padding: 16px;
  border-radius: 10px;
  overflow-x: auto;
  color: #7dd3fc;
}

.footer {
  text-align: center;
  padding: 20px;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Desktop layout */
@media (min-width: 768px) {
  .container {
    grid-template-columns: 1fr 1fr;
  }
}