:root {
  --guide-ink: #101827;
  --guide-text: #354963;
  --guide-muted: #66768b;
  --guide-line: #d5ebf2;
  --guide-soft: #edfafd;
  --guide-accent: #08aabd;
  --guide-accent-dark: #007f91;
  --guide-warn: #fff5e8;
}

body.guide-book-page {
  background: #f4f8fa;
}

.guide-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 0;
  height: 4px;
  background: var(--guide-accent);
  transition: width .08s linear;
}

.guide-main {
  width: min(1220px, calc(100% - 32px));
  margin: 32px auto 96px;
}

.guide-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  color: var(--guide-muted);
  font-size: 14px;
}

.guide-breadcrumbs a {
  color: var(--guide-accent-dark);
}

.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: 540px;
  padding: clamp(34px, 6vw, 76px);
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 22px 60px rgba(20, 54, 78, .08);
}

.guide-kicker,
.guide-section-label,
.guide-chapter-number {
  display: inline-flex;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--guide-accent-dark);
  background: #dff8fb;
  font-size: 13px;
  font-weight: 800;
}

.guide-hero h1 {
  max-width: 820px;
  margin: 18px 0 20px;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  letter-spacing: 0;
}

.guide-subtitle {
  max-width: 780px;
  margin: 0;
  color: var(--guide-text);
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.55;
}

.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: 28px;
  color: var(--guide-muted);
  font-size: 14px;
}

.guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.guide-button,
.guide-button-secondary {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--guide-accent);
  border-radius: 999px;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.guide-button {
  color: #fff;
  background: var(--guide-accent);
}

.guide-button:hover,
.guide-button:focus {
  color: #fff;
  background: var(--guide-accent-dark);
}

.guide-button-secondary {
  color: var(--guide-ink);
  background: #fff;
}

.guide-author-visual {
  align-self: stretch;
  display: grid;
  grid-template-rows: 1fr auto;
  overflow: hidden;
  border-radius: 8px;
  background: var(--guide-soft);
}

.guide-author-visual img {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
  object-position: center 22%;
}

.guide-author-visual figcaption {
  padding: 18px;
  color: var(--guide-text);
  background: var(--guide-soft);
}

.guide-author-visual strong,
.guide-author-visual span {
  display: block;
}

.guide-author-visual span {
  margin-top: 4px;
  color: var(--guide-muted);
  font-size: 14px;
}

.guide-layout {
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  margin-top: 32px;
}

.guide-toc {
  position: sticky;
  top: 98px;
  padding: 24px;
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: #fff;
}

.guide-toc h2 {
  margin: 0 0 14px;
  font-size: 21px;
}

.guide-toc ol {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: guide-chapters;
}

.guide-toc li {
  counter-increment: guide-chapters;
}

.guide-toc a,
.guide-toc span {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 8px;
  align-items: start;
  padding: 8px 6px;
  border-radius: 6px;
  color: var(--guide-text);
  font-size: 14px;
  line-height: 1.35;
  text-decoration: none;
}

.guide-toc a::before,
.guide-toc span::before {
  content: counter(guide-chapters, decimal-leading-zero);
  color: var(--guide-accent-dark);
  font-size: 12px;
  font-weight: 800;
}

.guide-toc a {
  color: var(--guide-ink);
  background: var(--guide-soft);
  font-weight: 800;
}

.guide-toc span {
  color: #7a8797;
}

.guide-content {
  display: grid;
  gap: 24px;
}

.guide-section,
.guide-chapter-card,
.guide-link-band,
.guide-author-strip {
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: #fff;
}

.guide-section {
  padding: clamp(26px, 4vw, 46px);
}

.guide-section h2,
.guide-chapter-card h2,
.guide-link-band h2 {
  margin: 12px 0 14px;
  font-size: clamp(27px, 3.4vw, 40px);
  line-height: 1.15;
  letter-spacing: 0;
}

.guide-section p,
.guide-chapter-card p,
.guide-link-band p {
  color: var(--guide-text);
  font-size: 18px;
}

.guide-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.guide-principle {
  padding: 20px;
  border-left: 4px solid var(--guide-accent);
  background: #f7fbfc;
}

.guide-principle strong {
  display: block;
  margin-bottom: 7px;
}

.guide-principle p {
  margin: 0;
  font-size: 15px;
}

.guide-chapter-card {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 24px;
  padding: clamp(26px, 4vw, 44px);
}

.guide-chapter-card__index {
  display: grid;
  width: 78px;
  height: 78px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--guide-accent);
  font-size: 26px;
  font-weight: 800;
}

.guide-chapter-card h2 {
  margin-top: 0;
}

.guide-chapter-card p {
  margin: 0 0 20px;
}

.guide-chapter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.guide-chapter-tags span {
  padding: 6px 10px;
  border-radius: 999px;
  color: var(--guide-text);
  background: var(--guide-soft);
  font-size: 13px;
  font-weight: 700;
}

.guide-planned {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}

.guide-planned div {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  align-items: center;
  min-height: 70px;
  padding: 14px;
  border: 1px solid var(--guide-line);
  border-radius: 6px;
  background: #fbfdfe;
}

.guide-planned b {
  color: var(--guide-accent-dark);
  text-align: center;
}

.guide-planned span {
  color: var(--guide-text);
  font-weight: 700;
}

.guide-author-strip {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 22px;
}

.guide-author-strip img {
  width: 92px;
  height: 92px;
  border-radius: 8px;
  object-fit: cover;
  object-position: center 20%;
}

.guide-author-strip h2 {
  margin: 0 0 5px;
  font-size: 23px;
}

.guide-author-strip p {
  margin: 0;
  color: var(--guide-text);
}

.guide-link-band {
  padding: clamp(26px, 4vw, 44px);
  background: var(--guide-soft);
}

.guide-link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.guide-link-grid a {
  display: block;
  padding: 18px;
  border: 1px solid var(--guide-line);
  border-radius: 6px;
  color: var(--guide-ink);
  background: #fff;
  font-weight: 800;
  text-decoration: none;
}

.guide-mobile-toc {
  display: none;
}

.guide-article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 32px;
  align-items: start;
}

.guide-article__body {
  overflow: hidden;
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: #fff;
}

.guide-article__hero,
.guide-article__content {
  padding: clamp(28px, 5vw, 58px);
}

.guide-article__hero {
  background: var(--guide-soft);
}

.guide-article__hero h1 {
  max-width: 900px;
  margin: 16px 0;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.05;
  letter-spacing: 0;
}

.guide-article__lead {
  max-width: 820px;
  margin: 0;
  color: var(--guide-text);
  font-size: clamp(19px, 2vw, 23px);
}

.guide-byline {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 24px;
  color: var(--guide-text);
}

.guide-byline img {
  width: 54px;
  height: 54px;
  border-radius: 8px;
  object-fit: cover;
}

.guide-byline b,
.guide-byline span {
  display: block;
}

.guide-byline span {
  color: var(--guide-muted);
  font-size: 13px;
}

.guide-article__content h2 {
  margin: 46px 0 14px;
  font-size: clamp(27px, 3vw, 38px);
  line-height: 1.15;
}

.guide-article__content h2:first-child {
  margin-top: 0;
}

.guide-article__content h3 {
  margin: 30px 0 10px;
  font-size: 23px;
}

.guide-article__content p,
.guide-article__content li {
  color: var(--guide-text);
  font-size: 18px;
}

.guide-article__content p {
  margin: 0 0 18px;
}

.guide-article__content ul,
.guide-article__content ol {
  display: grid;
  gap: 10px;
  margin: 0 0 24px;
  padding-left: 24px;
}

.guide-note,
.guide-warning {
  margin: 28px 0;
  padding: 22px;
  border-radius: 6px;
}

.guide-note {
  border-left: 4px solid var(--guide-accent);
  background: var(--guide-soft);
}

.guide-warning {
  border-left: 4px solid #d78a25;
  background: var(--guide-warn);
}

.guide-note p,
.guide-warning p {
  margin: 0;
}

.guide-table-wrap {
  overflow-x: auto;
  margin: 24px 0 32px;
  border: 1px solid var(--guide-line);
  border-radius: 6px;
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.guide-table th,
.guide-table td {
  padding: 15px;
  border-bottom: 1px solid var(--guide-line);
  text-align: left;
  vertical-align: top;
}

.guide-table th {
  color: var(--guide-ink);
  background: var(--guide-soft);
}

.guide-table tr:last-child td {
  border-bottom: 0;
}

.guide-side {
  position: sticky;
  top: 98px;
  display: grid;
  gap: 14px;
}

.guide-side__box {
  padding: 20px;
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: #fff;
}

.guide-side__box h2 {
  margin: 0 0 12px;
  font-size: 19px;
}

.guide-side__box a {
  display: block;
  padding: 8px 0;
  color: var(--guide-text);
  font-size: 14px;
  text-decoration: none;
}

.guide-side__box a:hover {
  color: var(--guide-accent-dark);
}

.guide-chapter-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 32px;
}

.guide-chapter-nav a,
.guide-chapter-nav span {
  padding: 18px;
  border: 1px solid var(--guide-line);
  border-radius: 6px;
  color: var(--guide-ink);
  background: #fff;
  text-decoration: none;
}

.guide-chapter-nav span {
  color: var(--guide-muted);
  text-align: right;
}

@media (max-width: 980px) {
  .guide-hero,
  .guide-layout,
  .guide-article {
    grid-template-columns: 1fr;
  }

  .guide-author-visual {
    grid-template-columns: 150px 1fr;
    grid-template-rows: auto;
  }

  .guide-author-visual img {
    min-height: 170px;
  }

  .guide-toc,
  .guide-side {
    display: none;
  }

  .guide-mobile-toc {
    display: block;
    margin-top: 24px;
    border: 1px solid var(--guide-line);
    border-radius: 8px;
    background: #fff;
  }

  .guide-mobile-toc summary {
    padding: 18px;
    font-weight: 800;
    cursor: pointer;
  }

  .guide-mobile-toc .guide-toc {
    position: static;
    display: block;
    border: 0;
    border-top: 1px solid var(--guide-line);
    border-radius: 0;
  }
}

@media (max-width: 680px) {
  .guide-main {
    width: min(100% - 24px, 1220px);
    margin-top: 18px;
  }

  .guide-hero {
    min-height: 0;
    padding: 26px 20px;
  }

  .guide-hero h1 {
    font-size: 38px;
  }

  .guide-author-visual {
    grid-template-columns: 105px 1fr;
  }

  .guide-author-visual img {
    min-height: 135px;
  }

  .guide-principles,
  .guide-planned,
  .guide-link-grid,
  .guide-chapter-nav {
    grid-template-columns: 1fr;
  }

  .guide-chapter-card {
    grid-template-columns: 1fr;
  }

  .guide-chapter-card__index {
    width: 58px;
    height: 58px;
    font-size: 20px;
  }

  .guide-author-strip {
    grid-template-columns: 72px 1fr;
  }

  .guide-author-strip img {
    width: 72px;
    height: 72px;
  }

  .guide-author-strip .guide-button-secondary {
    grid-column: 1 / -1;
  }

  .guide-article__hero,
  .guide-article__content {
    padding: 26px 20px;
  }

  .guide-article__content p,
  .guide-article__content li,
  .guide-section p,
  .guide-chapter-card p,
  .guide-link-band p {
    font-size: 16px;
  }

  .guide-chapter-nav span {
    text-align: left;
  }
}

@media print {
  .site-header-clean,
  .site-footer-clean,
  .mobile-bottom-cta,
  .guide-progress,
  .guide-breadcrumbs,
  .guide-actions,
  .guide-toc,
  .guide-mobile-toc,
  .guide-side,
  .guide-chapter-nav {
    display: none !important;
  }

  body.guide-book-page {
    color: #000;
    background: #fff;
  }

  .guide-main {
    width: 100%;
    margin: 0;
  }

  .guide-hero,
  .guide-section,
  .guide-chapter-card,
  .guide-author-strip,
  .guide-link-band,
  .guide-article__body {
    border-color: #bbb;
    box-shadow: none;
  }

  .guide-article {
    display: block;
  }
}