:root {
  --ink: #14324b;
  --ink-soft: #537697;
  --paper: #fffaf3;
  --line: rgba(20, 50, 75, 0.13);
  --line-strong: rgba(20, 50, 75, 0.24);
  --shadow: rgba(20, 50, 75, 0.10);
  --warm: #e99b3f;
  --warm-soft: #fff0d9;
  --sky: #dceffd;
  --sky-strong: #bdddf5;
  --coral: #da5c44;
  --mint: #dff4ee;
}

* { box-sizing: border-box; }
@page { size: A4; margin: 0; }
html, body {
  margin: 0;
  padding: 0;
  background:
    linear-gradient(180deg, #eef8ff 0%, #fff8ee 100%);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
}
body {
  print-color-adjust: exact;
  -webkit-print-color-adjust: exact;
}
.book { counter-reset: page; }
.page {
  position: relative;
  width: 210mm;
  min-height: 297mm;
  margin: 0 auto 10mm;
  padding: 15mm 16mm 17mm;
  background:
    radial-gradient(circle at top right, rgba(233,155,63,0.18), transparent 20%),
    radial-gradient(circle at left top, rgba(189,221,245,0.22), transparent 28%),
    linear-gradient(180deg, rgba(255,255,255,0.985), rgba(255,250,243,0.985));
  box-shadow: 0 20px 44px var(--shadow);
  overflow: hidden;
  page-break-after: always;
}
.page::before {
  content: "";
  position: absolute;
  inset: 7mm 7mm 8mm;
  border: 1px solid var(--line);
  border-radius: 6.5mm;
  pointer-events: none;
}
.page::selection {
  background: rgba(233,155,63,0.16);
}
.page::after {
  counter-increment: page;
  content: counter(page, decimal-leading-zero);
  position: absolute;
  right: 15mm;
  bottom: 9mm;
  font-size: 9.5pt;
  letter-spacing: 0.18em;
  color: rgba(22,54,94,0.65);
}
.cover-page, .airline-cover {
  background:
    radial-gradient(circle at top right, rgba(233,155,63,0.22), transparent 20%),
    radial-gradient(circle at left center, rgba(189,221,245,0.22), transparent 28%),
    linear-gradient(180deg, #f8fcff 0%, #fffaf3 100%);
}
.page-topline, .eyebrow, .chapter-no, .toc-no {
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.page-topline, .eyebrow {
  font-size: 9.5pt;
  color: var(--ink-soft);
}
.cover-page h1, .airline-cover h2, .page-heading h2 {
  margin: 0;
  color: var(--ink);
}
.page-watermark {
  position: absolute;
  top: 18mm;
  right: 18mm;
  font-size: 28pt;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: rgba(20, 50, 75, 0.05);
  pointer-events: none;
}
.cover-grid, .hero-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 10mm;
  align-items: start;
}
.cover-page h1 {
  margin-top: 8mm;
  font-size: 32pt;
  line-height: 1.08;
  letter-spacing: 0.03em;
}
.subtitle {
  margin: 3mm 0 5mm;
  color: #c56d1f;
  font-size: 15pt;
  font-weight: 700;
}
.cover-copy p, .hero-copy p, .caption-card p, .toc-card li, .note-card p {
  line-height: 1.82;
}
.cover-badge, .toc-card, .note-card, .caption-card, .copyright-card, .print-card {
  background: rgba(255,255,255,0.90);
  border: 1px solid var(--line);
  border-radius: 6mm;
  box-shadow: 0 10px 22px rgba(22,54,94,0.05);
  padding: 6mm;
}
.cover-image img, .hero-image img, .full-image img {
  display: block;
  width: 100%;
  border-radius: 5mm;
  border: 1px solid var(--line);
}
.cover-image img, .hero-image img {
  box-shadow: 0 12px 30px rgba(22,54,94,0.09);
}
.data-strip, .cover-points {
  display: grid;
  gap: 3mm;
}
.data-strip span, .cover-points span {
  display: block;
  padding: 3mm 4mm;
  border-left: 4px solid var(--warm);
  background: rgba(255,255,255,0.76);
}
.chapter-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5mm;
  margin: 4mm 0 4mm;
}
.chapter-chip, .role-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1.6mm 3.6mm;
  border-radius: 999px;
  font-size: 9.5pt;
  font-weight: 800;
  letter-spacing: 0.04em;
}
.chapter-chip {
  color: #fff;
  background: linear-gradient(90deg, var(--coral), var(--warm));
}
.chapter-chip-soft {
  color: var(--ink);
  background: var(--warm-soft);
}
.image-credit {
  margin-top: 3mm;
  color: var(--ink-soft);
  font-size: 9.5pt;
  text-align: center;
}
.chapter-footerline {
  display: flex;
  justify-content: space-between;
  gap: 3mm;
  margin-top: 7mm;
  padding-top: 4mm;
  border-top: 1px dashed var(--line-strong);
  color: var(--ink-soft);
  font-size: 9pt;
}
.page-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 6mm;
  margin-bottom: 5mm;
}
.heading-block {
  display: flex;
  align-items: end;
  gap: 6mm;
}
.chapter-no {
  margin: 0;
  color: var(--coral);
  font-size: 11pt;
  font-weight: 800;
}
.page-heading h2 {
  font-size: 22pt;
}
.role-badge {
  color: var(--ink);
  background: var(--mint);
  border: 1px solid rgba(20, 50, 75, 0.1);
}
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  columns: 2;
  column-gap: 10mm;
}
.toc-list li {
  break-inside: avoid;
  margin-bottom: 3.2mm;
  padding-bottom: 2.6mm;
  border-bottom: 1px dashed rgba(20, 50, 75, 0.08);
}
.toc-no {
  color: #cb6400;
  font-weight: 700;
  margin-right: 2mm;
}
.full-image {
  margin: 0;
}
.full-image img {
  max-height: 204mm;
  object-fit: contain;
  background: rgba(255,255,255,0.66);
}
.caption-card {
  margin-top: 5mm;
}
.caption-card p {
  margin: 0;
}
.copyright-grid, .extras-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8mm;
}
.copyright-title {
  margin: 0 0 4mm;
  font-size: 20pt;
}
.copyright-meta, .print-meta {
  display: grid;
  gap: 2.4mm;
  font-size: 10.5pt;
  line-height: 1.8;
}
.section-tag {
  display: inline-block;
  padding: 1.8mm 4mm;
  border-radius: 999px;
  font-size: 9pt;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(90deg, var(--ink), #3d6b93);
  margin-bottom: 4mm;
}
.page-footnote {
  display: flex;
  justify-content: space-between;
  gap: 3mm;
  margin-top: 4mm;
  color: var(--ink-soft);
  font-size: 8.8pt;
  letter-spacing: 0.04em;
}
@media print {
  html, body { background: #fff; }
  .page { margin: 0; box-shadow: none; }
}