:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #5b6475;
  --line: #d5d9e0;
  --accent: #2f6fde;
  --accent-text: #ffffff;
  --drop: #eef3fd;
  --error: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --card: #1d2128;
    --text: #e6e9ef;
    --muted: #9aa3b2;
    --line: #353b45;
    --accent: #6b9cf0;
    --accent-text: #0d1320;
    --drop: #1f2a3d;
    --error: #f2b8b5;
  }
}

* { box-sizing: border-box; }

/* Elements given a display below would otherwise ignore the hidden attribute. */
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: grid;
  place-items: start center;
  padding: 48px 16px;
}

main {
  width: 100%;
  max-width: 600px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
}

@media (max-width: 480px) {
  body { padding: 16px; }
  main { padding: 20px 16px; }
}

h1 { font-size: 1.5rem; margin: 0 0 4px; }
h2 { font-size: 1.05rem; margin: 0; }
.lede { color: var(--muted); margin: 0 0 20px; }

.drop {
  display: block;
  position: relative;
  border: 2px dashed var(--line);
  border-radius: 10px;
  padding: 32px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over, .drop:focus-within { border-color: var(--accent); background: var(--drop); }
.drop strong { color: var(--accent); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.has-pages .drop { padding: 16px; }
.hint { display: block; color: var(--muted); font-size: .875rem; margin-top: 6px; }

.pages { margin-top: 20px; }
.pages[hidden] { display: none; }
.pages-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.count { color: var(--muted); font-weight: normal; }
.link {
  border: none;
  background: none;
  color: var(--accent);
  font: inherit;
  font-size: .875rem;
  cursor: pointer;
  padding: 4px;
}

.list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }
.page {
  display: grid;
  grid-template-columns: auto 56px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  cursor: grab;
}
.page.dragging { opacity: .4; }
.page.drop-before { box-shadow: 0 -3px 0 var(--accent); }
.page.drop-after { box-shadow: 0 3px 0 var(--accent); }
.grip { color: var(--muted); font-size: 1.1rem; line-height: 1; user-select: none; }
.thumb {
  width: 56px;
  height: 56px;
  object-fit: contain;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.info { min-width: 0; display: grid; }
.name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.meta { color: var(--muted); font-size: .8125rem; }
.controls { display: flex; gap: 4px; }
.icon {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
}
.icon:disabled { opacity: .35; cursor: default; }
.icon:focus-visible, .link:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

#status { min-height: 1.5em; margin: 16px 0 0; color: var(--muted); }
#status.error { color: var(--error); }

.result { margin-top: 8px; display: grid; gap: 12px; }
.result[hidden] { display: none; }
.details { color: var(--muted); font-size: .875rem; margin: 0; text-align: center; }
.actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 16px; }
.result .actions { margin-top: 0; }

.button {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent);
  cursor: pointer;
}
.primary { background: var(--accent); color: var(--accent-text); }
.secondary { background: transparent; color: var(--accent); }
.button:disabled { opacity: .5; cursor: not-allowed; }
.button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

footer { color: var(--muted); font-size: .8125rem; margin-top: 24px; }
footer a { color: inherit; }