:root {
  --wp-bg: #ffffff; --wp-bg-soft: #f7f7f8;
  --wp-ink: #0c0d10; --wp-ink-soft: #55596a; --wp-ink-faint: #9ca1b0;
  --wp-border: rgba(17,18,22,.08); --wp-border-strong: rgba(17,18,22,.18);
  --wp-accent: #0a2a66; --wp-accent-2: #3b6cff; --wp-accent-3: #7a5cff;
  --wp-good: #0aa07b; --wp-warn: #c98500; --wp-bad: #c13a3a;
  --wp-radius: 14px;
  --wp-shadow-sm: 0 1px 2px rgba(17,18,22,.04), 0 4px 14px rgba(17,18,22,.04);
  --wp-shadow-md: 0 6px 24px rgba(17,18,22,.08), 0 2px 6px rgba(17,18,22,.04);
}
html, body {
  background: var(--wp-bg); color: var(--wp-ink);
  font-family: 'Inter','Noto Sans SC','PingFang SC','SF Pro SC',-apple-system,sans-serif;
  line-height: 1.7; scroll-behavior: smooth;
  margin: 0; padding: 0;
}
a { color: var(--wp-accent-2); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .2s; }
a:hover { border-bottom-color: currentColor; }
.layout { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; max-width: 1400px; margin: 0 auto; }
.sidebar { position: sticky; top: 0; align-self: start; height: 100vh; overflow-y: auto; padding: 40px 24px 40px 32px; border-right: 1px solid var(--wp-border); background: var(--wp-bg-soft); font-size: 13px; }
.toc-title { font-size: 11px; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--wp-ink-faint); margin: 0 0 16px; padding: 0 8px; }
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { line-height: 1.45; }
.toc li a { display: block; padding: 6px 10px; color: var(--wp-ink-soft); border-left: 2px solid transparent; border-radius: 4px; transition: background .15s, color .15s, border-left-color .15s; }
.toc-l1 a { font-weight: 600; }
.toc-l2 a { font-size: 13.5px; }
.toc-l3 a { padding-left: 24px !important; font-size: 12.5px; color: var(--wp-ink-faint); }
.toc-l4 a { padding-left: 36px !important; font-size: 12px; color: var(--wp-ink-faint); }
.sidebar-foot { margin-top: 32px; padding: 16px 8px 0; border-top: 1px solid var(--wp-border); color: var(--wp-ink-faint); font-size: 11px; line-height: 1.6; }
main.content { min-width: 0; }
article { max-width: 820px; margin: 0 auto; padding: 80px 56px 120px; }
.cover { min-height: 92vh; margin: -80px -180px 92px; padding: 92px 56px 72px; background: linear-gradient(135deg, #ffffff 0%, #f8fbff 100%); display: flex; align-items: center; border-bottom: 1px solid var(--wp-border); }
.cover-inner { width: 100%; max-width: 1220px; margin: 0 auto; }
.cover-hero-grid { display: grid; grid-template-columns: minmax(360px, .78fr) minmax(520px, 1fr); gap: 56px; align-items: center; }
.cover-book { margin: 0; }
.cover-book img { width: 100%; max-height: 720px; object-fit: contain; display: block; border-radius: 28px; box-shadow: 0 28px 80px rgba(10, 20, 40, .18); background: #061326; }
.cover-copy { min-width: 0; padding: 12px 0; }
.cover-eyebrow { font-size: 12px; letter-spacing: 0.18em; color: var(--wp-accent-2); text-transform: uppercase; margin-bottom: 28px; font-weight: 500; }
.cover-title { font-size: 50px; line-height: 1.16; letter-spacing: 0; margin: 0 0 28px; font-weight: 750; color: var(--wp-ink); text-wrap: balance; }
.cover-subtitle { font-size: 22px; font-weight: 400; color: var(--wp-ink-soft); line-height: 1.7; margin: 0 0 28px; max-width: 680px; letter-spacing: 0; }
.cover-lede { font-size: 18px; line-height: 1.75; color: var(--wp-ink-soft); margin: 0 0 38px; max-width: 660px; }
.cover-image-wrap { width: 100%; aspect-ratio: 16 / 9; overflow: hidden; border-radius: 16px; box-shadow: var(--wp-shadow-md); margin: 0 0 48px; background: #f5f5f6; }
.cover-image-wrap img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cover-pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin: 34px 0 28px; }
.cover-pillar { border-top: 2px solid rgba(17,18,22,.16); padding-top: 16px; color: var(--wp-ink-soft); font-size: 16px; line-height: 1.55; font-weight: 600; }
.cover-meta { display: flex; gap: 32px; padding: 18px 0 0; border-top: 1px solid var(--wp-border); margin-bottom: 0; }
.meta-label { font-size: 11px; letter-spacing: 0.12em; color: var(--wp-ink-faint); text-transform: uppercase; margin-right: 8px; }
.meta-value { font-size: 14px; color: var(--wp-ink); font-weight: 500; }
.cover-foot { display: flex; justify-content: flex-end; }
.press-stamp { font-size: 11px; letter-spacing: 0.4em; color: var(--wp-ink-faint); font-weight: 500; padding: 6px 14px; border: 1px solid var(--wp-border-strong); border-radius: 100px; }
h1 { display: none; }
h1.cover-title { display: block; }
h2 { font-size: 36px; line-height: 1.2; letter-spacing: 0; font-weight: 700; margin: 96px 0 24px; padding-top: 24px; border-top: 1px solid var(--wp-border); color: var(--wp-ink); }
h3 { font-size: 22px; line-height: 1.35; font-weight: 600; letter-spacing: 0; margin: 56px 0 16px; color: var(--wp-ink); }
h4 { font-size: 17px; font-weight: 600; color: var(--wp-ink); margin: 32px 0 12px; }
p { font-size: 16px; line-height: 1.85; margin: 0 0 18px; color: var(--wp-ink); }
ul, ol { font-size: 16px; line-height: 1.75; padding-left: 24px; margin: 0 0 24px; }
li { margin-bottom: 6px; }
li.cb { list-style: none; margin-left: -24px; }
code.ic { background: rgba(10,42,102,.06); color: var(--wp-accent); padding: 2px 6px; border-radius: 4px; font-family: 'JetBrains Mono','SF Mono',monospace; font-size: 14px; }
.chapter-figure { margin: 40px -56px 56px; text-align: center; }
.chapter-figure img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 14px; box-shadow: var(--wp-shadow-md); display: block; }
.chapter-figure figcaption { margin-top: 12px; font-size: 12px; color: var(--wp-ink-faint); letter-spacing: 0.05em; }
.visual-summary { display: none; }
.visual-summary-header { max-width: 720px; margin: 0 0 24px; }
.visual-summary-kicker { font-size: 12px; color: var(--wp-accent-2); font-weight: 600; margin-bottom: 8px; letter-spacing: 0; }
.visual-summary h2 { border: 0; margin: 0 0 10px; padding: 0; font-size: 28px; letter-spacing: 0; }
.visual-summary p { max-width: 680px; font-size: 15.5px; color: var(--wp-ink-soft); margin-bottom: 0; }
.visual-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.visual-card { margin: 0; background: #fff; border: 1px solid var(--wp-border); border-radius: 12px; overflow: hidden; box-shadow: var(--wp-shadow-sm); }
.visual-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; background: #f5f6fa; }
.visual-card figcaption { padding: 14px 16px 16px; font-size: 13px; line-height: 1.55; color: var(--wp-ink-soft); text-align: left; letter-spacing: 0; }
.visual-card figcaption strong { display: block; color: var(--wp-ink); font-size: 14px; margin-bottom: 4px; }
.chapter-figure.key-figure { margin: 44px -72px 60px; }
.chapter-figure.key-figure img { border-radius: 16px; }
.chapter-figure figcaption strong { display: block; color: var(--wp-ink-soft); font-size: 13px; margin-bottom: 2px; letter-spacing: 0; }
.abstract { background: linear-gradient(135deg, #fafbfd 0%, #f5f6fa 100%); border: 1px solid var(--wp-border); border-left: 3px solid var(--wp-accent-2); padding: 32px 36px; border-radius: 12px; margin-bottom: 80px; }
.abstract h2 { margin-top: 0; padding-top: 0; border: none; font-size: 22px; }
blockquote.callout { background: rgba(59,108,255,.04); border-left: 3px solid var(--wp-accent-2); margin: 32px 0; padding: 18px 24px; border-radius: 0 8px 8px 0; color: var(--wp-ink); }
blockquote.callout p { margin: 0 0 12px; font-size: 15.5px; }
blockquote.callout p:last-child { margin-bottom: 0; }
blockquote.callout strong { color: var(--wp-accent); }
.table-wrap { margin: 32px 0; overflow-x: auto; border-radius: var(--wp-radius); border: 1px solid var(--wp-border); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
thead { background: var(--wp-bg-soft); }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--wp-border); vertical-align: top; }
tr:last-child td { border-bottom: none; }
th { font-weight: 600; color: var(--wp-ink); letter-spacing: 0.02em; }
td { color: var(--wp-ink-soft); }
pre.mermaid { background: var(--wp-bg-soft); border: 1px solid var(--wp-border); border-radius: 12px; padding: 28px 24px; margin: 32px 0; font-family: inherit; text-align: center; overflow-x: auto; }
pre:not(.mermaid) { background: #0c0d10; color: #e6e8ee; padding: 16px 20px; border-radius: 10px; overflow-x: auto; font-size: 13px; margin: 24px 0; }
hr { border: none; border-top: 1px solid var(--wp-border); margin: 64px 0; }
.back-cover { margin: 96px -56px -96px; padding: 52px 56px 60px; border-top: 1px solid var(--wp-border); background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%); page-break-before: always; }
.back-cover-grid { display: grid; grid-template-columns: minmax(220px, 0.72fr) 1fr; gap: 36px; align-items: center; }
.back-cover-visual { margin: 0; }
.back-cover-visual img { width: 100%; max-height: 760px; object-fit: contain; border-radius: 18px; box-shadow: var(--wp-shadow-md); display: block; background: #fff; }
.back-cover-copy h2 { margin: 0 0 16px; padding: 0; border: 0; font-size: 30px; letter-spacing: 0; }
.back-cover-copy p { font-size: 15.5px; color: var(--wp-ink-soft); }
.back-cover-marks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 30px; }
.back-cover-mark { border-top: 2px solid var(--wp-border-strong); padding-top: 12px; font-size: 13px; color: var(--wp-ink-soft); line-height: 1.5; }
.page-foot { margin-top: 80px; padding: 32px 0; border-top: 1px solid var(--wp-border); color: var(--wp-ink-faint); font-size: 12px; line-height: 1.6; }
@media print {
  .layout { display: block; }
  .sidebar { display: none; }
  main.content, article { padding: 24px 32px !important; max-width: 100% !important; }
  .cover { min-height: auto; margin: 0 0 32px; padding: 24px 24px 20px; page-break-after: always; }
  .cover-hero-grid { grid-template-columns: .58fr 1fr; gap: 24px; align-items: center; }
  .cover-book img { max-height: 430px; border-radius: 14px; }
  .cover-title { font-size: 40px; line-height: 1.08; letter-spacing: 0; margin-bottom: 14px; }
  .cover-subtitle { font-size: 14px; line-height: 1.5; margin-bottom: 12px; }
  .cover-lede { font-size: 12.5px; line-height: 1.5; margin-bottom: 14px; }
  .cover-pillars { grid-template-columns: 1fr; gap: 8px; margin: 12px 0 12px; }
  .cover-pillar { font-size: 10.5px; padding-top: 6px; }
  .cover-eyebrow { font-size: 9px; margin-bottom: 14px; }
  .cover-meta { gap: 16px; padding-top: 10px; }
  .meta-label { font-size: 8px; }
  .meta-value { font-size: 10px; }
  .cover-image-wrap { margin-bottom: 24px; }
  h2 { page-break-before: always; font-size: 28px; margin-top: 32px; padding-top: 16px; border: none; }
  h3 { page-break-after: avoid; }
  h4 { page-break-after: avoid; }
  pre, blockquote, .chapter-figure, .visual-card, .back-cover-grid, table { page-break-inside: avoid; }
  .chapter-figure, .visual-card, .back-cover-grid { break-inside: avoid; }
  .visual-summary h2, .back-cover h2 { page-break-before: auto; }
  .visual-summary { margin: 0 0 24px !important; padding: 24px 32px 28px !important; }
  .visual-summary h2 { font-size: 24px; }
  .visual-summary p { font-size: 12.5px; line-height: 1.5; margin-bottom: 14px; }
  .visual-grid { gap: 10px; }
  .visual-card img { height: 132px; aspect-ratio: auto; object-fit: cover; }
  .visual-card figcaption { padding: 8px 12px 10px; font-size: 11.5px; line-height: 1.4; }
  .visual-card figcaption strong { font-size: 12px; }
  .abstract-placeholder + blockquote.callout { display: none; }
  .back-cover { margin: 0 !important; padding: 32px !important; border-top: 0; page-break-before: always; page-break-inside: avoid; }
  .back-cover-grid { grid-template-columns: minmax(180px, 0.62fr) 1fr; gap: 24px; }
  .back-cover-visual img { max-height: 520px; border-radius: 12px; }
  .back-cover-copy h2 { font-size: 24px; line-height: 1.2; margin-bottom: 12px; }
  .back-cover-copy p { font-size: 13px; line-height: 1.55; margin-bottom: 10px; }
  .back-cover-marks { grid-template-columns: 1fr; gap: 8px; margin-top: 16px; }
  .back-cover-mark { font-size: 12px; padding-top: 8px; }
  .page-foot { display: none; }
  pre.mermaid { padding: 16px; }
  a { color: inherit; border: none; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 11px; color: #777; }
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  article { padding: 32px 24px; }
  .cover { margin: -32px -24px 64px; padding: 48px 24px 36px; min-height: auto; }
  .cover-hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .cover-book { order: 2; }
  .cover-copy { order: 1; }
  .cover-book img { max-height: 520px; border-radius: 18px; }
  .cover-title { font-size: 44px; line-height: 1.05; letter-spacing: 0; }
  .cover-subtitle { font-size: 20px; line-height: 1.6; }
  .cover-lede { font-size: 16px; }
  .cover-pillars { grid-template-columns: 1fr; gap: 14px; }
  .cover-image-wrap { border-radius: 12px; }
  .chapter-figure { margin-left: -24px; margin-right: -24px; }
  .visual-summary { margin: -32px -24px 64px; padding: 30px 24px; }
  .chapter-figure.key-figure { margin-left: -24px; margin-right: -24px; }
  .back-cover { margin: 72px -24px -32px; padding: 36px 24px; }
  .back-cover-grid { grid-template-columns: 1fr; }
  .back-cover-marks { grid-template-columns: 1fr; }
}