:root {
  --bg: #f3f4f7;
  --card: #ffffff;
  --text: #191c24;
  --muted: #5f6573;
  --line: #dde0e7;
  --accent: #3b5bdb;
  --accent-soft: #e6ebfb;
  --on-accent: #ffffff;
  --error: #d2463a;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111318; --card: #1a1d24; --text: #e9ebf0; --muted: #9aa0ad; --line: #2c303a;
    --accent: #7c96ff; --accent-soft: #1e2540; --on-accent: #0b0d14; --error: #ff7a6b;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111318; --card: #1a1d24; --text: #e9ebf0; --muted: #9aa0ad; --line: #2c303a;
  --accent: #7c96ff; --accent-soft: #1e2540; --on-accent: #0b0d14; --error: #ff7a6b;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 640px; margin: 0 auto; padding: 40px 16px 32px; }

header { margin-bottom: 20px; }
h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; line-height: 1.1; }
h1 span { color: var(--accent); }
.tagline { margin: 8px 0 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 14px;
  box-shadow: 0 1px 2px rgb(0 0 0 / 4%), 0 8px 24px rgb(0 0 0 / 5%);
}
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

/* form */
.row { display: flex; gap: 14px; align-items: flex-end; flex-wrap: wrap; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.row .field { margin-bottom: 0; }
.grow { flex: 1; min-width: 200px; }
label, .label { font-size: 0.8rem; font-weight: 600; color: var(--muted); }
input[type="text"], textarea, select {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; width: 100%;
}
#ean-input { font-variant-numeric: tabular-nums; letter-spacing: .06em; }
textarea { resize: vertical; min-height: 80px; }
input:focus-visible, textarea:focus-visible, select:focus-visible, .btn:focus-visible, .tabs button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
.hint { margin: 10px 0 0; min-height: 1.3em; }
.hint.error { color: var(--error); }

.btn {
  font: inherit; font-weight: 600;
  border-radius: 10px; padding: 10px 14px;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
}
.btn.primary { background: var(--accent); color: var(--on-accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; filter: none; }
.actions { margin-top: 16px; }

.seg { display: flex; gap: 4px; flex-wrap: wrap; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span {
  display: inline-block; padding: 8px 12px; font-size: 0.85rem; font-weight: 500; color: var(--text);
  border: 1px solid var(--line); border-radius: 999px; cursor: pointer; user-select: none;
}
.seg input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.tabs { margin-bottom: 14px; }
.tabs button {
  font: inherit; font-weight: 600; font-size: 0.9rem; color: var(--text);
  background: transparent; border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px; cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

/* preview: always white, like the paper it ends up on */
.preview {
  margin-top: 14px; background: #fff; border-radius: 10px; border: 1px solid var(--line);
  display: grid; place-items: center; min-height: 170px; padding: 16px;
}
.preview svg { display: block; width: 100%; max-width: 320px; height: auto; }
.preview.qr svg { max-width: 240px; }
.preview:empty::before { content: "Your code will appear here"; color: #8a909c; font-size: 0.9rem; }

footer { margin-top: 18px; text-align: center; }

/* embedded in another page */
.embedded body { background: transparent; }
.embedded .wrap { max-width: none; padding: 0; }
.embedded header { display: none; }
.embedded footer { margin-bottom: 4px; }