:root {
  --bg: #0f1220;
  --card: #1a1f35;
  --text: #e8ecff;
  --accent: #5a8cff;
  --ok: #57d38c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.app { max-width: 900px; margin: 0 auto; padding: 12px; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.tabs { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin: 12px 0; }
.tabs button {
  border: 0; padding: 10px; border-radius: 8px; background: #2a3150; color: var(--text);
}
.tabs button.active { background: var(--accent); }
.tab { display: none; }
.tab.active { display: block; }
.card { background: var(--card); border-radius: 12px; padding: 12px; margin-top: 8px; }
input, select, button { width: 100%; margin: 6px 0; padding: 10px; border-radius: 8px; border: none; }
button { cursor: pointer; background: var(--accent); color: #fff; }
@media (max-width: 640px) {
  .tabs { grid-template-columns: repeat(2, 1fr); }
  h1 { font-size: 20px; }
}