:root {
  --bg: #0f1218;
  --card: #1a2030;
  --text: #e8ecf4;
  --muted: #8b95a8;
  --accent: #5b8def;
  --border: #2a3348;
  font-family: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0 auto;
  max-width: 880px;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--text);
}
header h1 { margin: 0 0 0.25rem; font-size: 1.4rem; }
.muted { color: var(--muted); font-size: 0.9rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin: 1rem 0;
}
.card h2 { margin: 0 0 0.75rem; font-size: 1.05rem; }
label { display: block; margin: 0.5rem 0; font-size: 0.85rem; color: var(--muted); }
input, textarea, select {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.45rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #121722;
  color: var(--text);
}
.row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0.6rem; }
button {
  margin-top: 0.75rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #243049;
  color: var(--text);
  cursor: pointer;
}
button.accent { background: var(--accent); border-color: transparent; color: #fff; }
#preview { max-width: 100%; border-radius: 8px; margin-top: 0.5rem; }