:root {
  --fg: #111827;
  --fg-muted: #4b5563;
  --fg-faint: #9ca3af;
  --border: #e5e7eb;
  --bg: #fafafa;
  --surface: #ffffff;
  --accent: #B91C1C;
  --accent-soft: #fef2f2;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ヘッダー */
.hd { background: var(--surface); border-bottom: 1px solid var(--border); }
.hd-inner {
  max-width: 960px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.hd-logo { font-weight: 700; font-size: 15px; color: var(--fg); text-decoration: none; letter-spacing: .02em; }
.hd-nav { display: flex; gap: 16px; }
.hd-nav a { font-size: 13px; color: var(--fg-muted); text-decoration: none; }
.hd-nav a:hover { color: var(--accent); }

/* レイアウト */
.wrap { max-width: 960px; margin: 0 auto; padding: 40px 24px 64px; }
.head { margin-bottom: 28px; }
.head h1 { font-size: 24px; font-weight: 700; margin: 0 0 8px; }
.sub { font-size: 13px; color: var(--fg-muted); margin: 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 18px;
}
.card-hd { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.card-hd h2 { font-size: 16px; font-weight: 700; margin: 0; }
.step {
  display: inline-flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: 12px; font-weight: 700;
  flex-shrink: 0;
}

/* ドロップ領域 */
.drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; padding: 40px 16px; text-align: center; cursor: pointer;
  border: 2px dashed #d1d5db; border-radius: var(--radius);
  background: #fcfcfc; color: var(--fg-muted);
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop p { margin: 0; font-size: 13px; }
.drop .hint { font-size: 12px; color: var(--fg-faint); }

.note-lead { font-size: 13px; color: var(--fg-muted); margin: 0 0 16px; }

/* ツールバー */
.toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar-sp { flex: 1; }
.summary { font-size: 13px; font-weight: 600; color: var(--fg); }

/* ページ一覧 */
.pages {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: 14px;
}
.page {
  position: relative;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: #fff;
  padding: 8px;
  cursor: grab;
  transition: border-color .15s, opacity .15s, transform .12s;
}
.page:active { cursor: grabbing; }
.page.dragging { opacity: .4; }
.page.over { border-color: var(--accent); transform: scale(1.03); }
.page.excluded { opacity: .4; background: var(--bg); }
.page canvas {
  width: 100%; height: auto; display: block;
  border: 1px solid var(--border); border-radius: 4px; background: #fff;
}
.page-ph {
  width: 100%; aspect-ratio: 1 / 1.414;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg); border-radius: 4px; color: var(--fg-faint); font-size: 11px;
}
.page-meta { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-top: 8px; }
.page-no { font-size: 11px; color: var(--fg-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.page-x {
  border: none; background: none; padding: 2px 6px; cursor: pointer;
  font-size: 11px; color: var(--fg-faint); border-radius: 4px; font-family: inherit;
}
.page-x:hover { background: var(--accent-soft); color: var(--accent); }
.page.excluded .page-x { color: var(--accent); font-weight: 600; }
.page-src { font-size: 10px; color: var(--fg-faint); margin: 2px 0 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 入力 */
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; }
.filename-row { display: flex; align-items: center; gap: 6px; max-width: 340px; }
.filename-row input {
  flex: 1; height: 42px; padding: 0 12px; font-size: 14px; font-family: inherit;
  border: 1px solid var(--border); border-radius: 8px; background: #fff; color: var(--fg);
}
.filename-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(185,28,28,.1); }
.ext { font-size: 14px; color: var(--fg-muted); }

/* ボタン */
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 11px 20px; font-size: 14px; font-weight: 600; font-family: inherit;
  border-radius: 8px; cursor: pointer; border: 1.5px solid transparent;
  transition: opacity .15s, background .15s;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { opacity: .88; }
.btn-ghost { background: #fff; color: var(--fg-muted); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--fg-faint); }
.btn-sm { padding: 7px 14px; font-size: 12px; }

/* 状態表示 */
.err {
  margin: 14px 0 0; padding: 11px 14px; border-radius: 8px;
  background: #fef2f2; color: #991b1b; font-size: 13px;
}
.loading { margin: 14px 0 0; font-size: 13px; color: var(--fg-muted); }
.done {
  margin: 16px 0 0; padding: 12px 14px; border-radius: 8px;
  background: #f0fdf4; color: #166534; font-size: 13px; font-weight: 600;
}

.about { font-size: 13px; color: var(--fg-muted); margin: 0; line-height: 1.9; }

/* フッター */
.ft {
  border-top: 1px solid var(--border); background: var(--surface);
  padding: 24px; text-align: center; font-size: 12px; color: var(--fg-faint);
}
.ft p { margin: 0 0 6px; }
.copy { margin: 0; }

@media (max-width: 560px) {
  .wrap { padding: 28px 16px 48px; }
  .card { padding: 18px 16px; }
  .head h1 { font-size: 20px; }
  .pages { grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 10px; }
}