:root {
  --bg: #f7f7f5;
  --fg: #1a1a1a;
  --muted: #666;
  --card: #fff;
  --line: #ddd;
  --accent: #cd2d2f;
  --accent-2: #fcb527;
  --warn: #9a3412;
  --warn-bg: #fff7ed;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  padding: 1.25rem 1rem 3rem;
  max-width: 64rem;
  margin-inline: auto;
}
header h1 { margin: 0 0 .25rem; font-size: 1.75rem; }
.sub { margin: 0 0 1.5rem; color: var(--muted); }

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 22rem);
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 44rem) {
  main { grid-template-columns: 1fr; }
  .preview { order: -1; }
}

.controls, .preview {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: .75rem;
  padding: 1.25rem;
}
.field { margin: 0 0 1.25rem; padding: 0; border: 0; min-width: 0; }
.field:last-child { margin-bottom: 0; }
.field > span, .field > legend { display: block; font-weight: 600; margin-bottom: .4rem; padding: 0; }

input[type="url"], input[type="search"] {
  width: 100%;
  font: inherit;
  padding: .6rem .75rem;
  border: 1px solid var(--line);
  border-radius: .5rem;
  background: #fff;
}
input[type="url"]:focus, input[type="search"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* icon pickers */
.icon-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: .75rem; }
.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(3rem, 1fr));
  gap: .35rem;
  max-height: 16rem;
  overflow-y: auto;
  padding: .25rem;
  margin-top: .5rem;
  border: 1px solid var(--line);
  border-radius: .5rem;
}
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  flex: 0 0 auto;
  width: 3rem; height: 3rem;
  padding: .5rem;
  overflow: hidden;
  border: 2px solid var(--line);
  border-radius: .5rem;
  background: #fff;
  color: var(--fg);
  cursor: pointer;
}
.icon-row .icon-btn { width: 4.5rem; height: 4.5rem; padding: .6rem; }
.icon-btn svg { width: 100%; height: 100%; display: block; }
.icon-grid .icon-btn { width: auto; aspect-ratio: 1; }
.icon-btn:hover { border-color: #999; }
.icon-btn[aria-pressed="true"] { border-color: var(--accent); background: #fff5f5; }
.icon-btn.none { font-size: .85rem; color: var(--muted); }
#lucide-wrap summary { cursor: pointer; font-weight: 500; color: var(--muted); margin-bottom: .5rem; }
.file { display: inline-block; margin-top: .75rem; }
.file input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.file span { color: var(--accent); text-decoration: underline; cursor: pointer; font-size: .95rem; }
.file:focus-within span { outline: 2px solid var(--accent); }

/* colors */
.icon-btn.swatch {
  padding: 0;
  background: linear-gradient(135deg, var(--a) 50%, var(--b) 50%);
}
.icon-btn.swatch[aria-pressed="true"] { background: linear-gradient(135deg, var(--a) 50%, var(--b) 50%); }
.color-row { display: flex; flex-wrap: wrap; gap: 1rem; }
.color-row label { display: inline-flex; align-items: center; gap: .5rem; font-size: .95rem; }
.color-row input[type="color"] {
  width: 2.5rem; height: 2.5rem; padding: 0;
  border: 1px solid var(--line); border-radius: .5rem; background: none; cursor: pointer;
}
#icon-color-wrap[hidden] { display: none; }

.warn {
  margin: .75rem 0 0;
  padding: .5rem .75rem;
  font-size: .9rem;
  color: var(--warn); background: var(--warn-bg);
  border-radius: .5rem;
}

/* preview */
.qr-box {
  aspect-ratio: 1;
  display: flex; align-items: center; justify-content: center;
  background: repeating-conic-gradient(#eee 0 25%, #fff 0 50%) 0 0 / 16px 16px;
  border-radius: .5rem;
  overflow: hidden;
}
.qr-box canvas { width: 100%; height: auto; display: block; }
.qr-box .empty { color: var(--muted); font-size: .95rem; text-align: center; padding: 1rem; }
.downloads { display: flex; gap: .75rem; margin-top: 1rem; }
.downloads button {
  flex: 1;
  font: inherit; font-weight: 600;
  padding: .7rem;
  border: 0; border-radius: .5rem;
  background: var(--accent); color: #fff;
  cursor: pointer;
}
.downloads button:disabled { background: #ccc; cursor: not-allowed; }
.downloads button:not(:disabled):hover { filter: brightness(1.08); }
.check { display: flex; align-items: center; gap: .5rem; margin-top: .75rem; font-size: .95rem; }
.hint { color: var(--muted); font-size: .85rem; margin: .5rem 0 0; }

footer { margin-top: 2rem; color: var(--muted); font-size: .85rem; }
footer a { color: inherit; }