:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #5f6b7a;
  --accent: #2f6fde;
  --accent-ink: #ffffff;
  --border: #dde3ec;
  --warn: #b0561c;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141920;
    --card: #1d242e;
    --text: #e7ecf3;
    --muted: #9aa6b6;
    --accent: #6ea0ff;
    --accent-ink: #0f1622;
    --border: #2c3644;
    --warn: #f0a060;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header, main, footer { max-width: 960px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 28px; padding-bottom: 8px; }
header p { margin: 0; color: var(--muted); max-width: 80ch; }
h1 { margin: 0 0 6px; font-size: 2.1rem; letter-spacing: -0.02em; }
h2 { font-size: 1.15rem; margin: 0 0 8px; }
main { display: grid; gap: 16px; padding-bottom: 32px; }
footer { text-align: center; color: var(--muted); font-size: 0.9rem; padding-bottom: 40px; }
a { color: var(--accent); }
.muted { color: var(--muted); font-size: 0.92rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.drop {
  display: grid;
  gap: 6px;
  text-align: center;
  padding: 30px 20px;
  border: 2px dashed var(--border);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop:hover, .drop.over, .drop:focus-within { border-color: var(--accent); }
.drop.over { background: color-mix(in srgb, var(--accent) 8%, var(--card)); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.drop.loaded { border-style: solid; padding: 14px 20px; gap: 2px; }
button.link {
  font: inherit; color: var(--accent); background: none; border: 0; padding: 0;
  text-decoration: underline; cursor: pointer;
}

.settings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(108px, 1fr));
  gap: 14px 16px;
}
.field { display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; color: var(--muted); margin: 0; }
fieldset.field { border: 0; padding: 0; min-width: 0; }
fieldset.field legend { padding: 0; margin-bottom: 4px; }
input[type=number], select {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; width: 100%;
}
input:focus-visible, select:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.seg > div { display: flex; }
.seg label { display: block; }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.seg span {
  display: block; padding: 8px 14px; border: 1px solid var(--border);
  color: var(--text); background: var(--bg); cursor: pointer; user-select: none;
}
.seg label:first-of-type span { border-radius: 8px 0 0 8px; }
.seg label:last-of-type span { border-radius: 0 8px 8px 0; margin-left: -1px; }
.seg input:checked + span { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px; }
.checks { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px 22px; }
.checks label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }

.previewWrap { display: flex; justify-content: center; }
#preview { display: block; max-width: 100%; border-radius: 6px; box-shadow: 0 1px 8px rgba(0, 0, 0, 0.18); }
#summary { margin: 14px 0 0; text-align: center; color: var(--muted); }
#summary.warn { color: var(--warn); }
.actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 16px; }
#progress { text-align: center; margin: 10px 0 0; min-height: 1.4em; }
button {
  font: inherit; font-weight: 600; padding: 10px 22px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
}
button.secondary { background: transparent; color: var(--accent); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

.how ol { margin: 0; padding-left: 22px; }
.how li + li { margin-top: 6px; }

#printPages { display: none; }
@media print {
  body > :not(#printPages) { display: none !important; }
  #printPages { display: block; }
  #printPages img { display: block; break-after: page; page-break-after: always; }
}