:root {
  color-scheme: dark;
  --bg: #0f1419;
  --card: #171d24;
  --text: #e7ecf1;
  --muted: #9aa7b5;
  --accent: #5fd38d;
  --border: #2a3440;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: linear-gradient(180deg, #101820, #0b1015);
  color: var(--text);
}
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}
header h1 { margin: 0 0 0.25rem; font-size: 2rem; }
header p { color: var(--muted); margin-top: 0; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-top: 1rem;
}
label {
  display: block;
  margin-bottom: 0.85rem;
  color: var(--muted);
  font-size: 0.92rem;
}
input, select, button {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1419;
  color: var(--text);
}
button {
  background: var(--accent);
  color: #06210f;
  font-weight: 600;
  cursor: pointer;
  border: none;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}
pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #0b1015;
  border-radius: 8px;
  padding: 1rem;
  overflow: auto;
}
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.preview-grid img {
  width: 100%;
  border-radius: 8px;
  background:
    linear-gradient(45deg, #222 25%, transparent 25%),
    linear-gradient(-45deg, #222 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #222 75%),
    linear-gradient(-45deg, transparent 75%, #222 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
#download-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--accent);
}