.page-guides {
  --gd-toc-w: 236px;
  --gd-chapter-gap: var(--space-3);
  position: relative;
  background: var(--color-surface);
}

/* ---------- 首屏 ---------- */
.page-guides .gd-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) 0 var(--space-6);
}

.page-guides .gd-hero::before {
  content: "";
  position: absolute;
  top: -25%;
  left: 58%;
  width: 2px;
  height: 150%;
  transform: rotate(15deg);
  background: linear-gradient(180deg,
    transparent 0%,
    color-mix(in srgb, var(--color-contrast-accent) 70%, transparent) 42%,
    color-mix(in srgb, var(--color-contrast-accent) 24%, transparent) 62%,
    transparent 100%);
  pointer-events: none;
}

.page-guides .gd-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--color-contrast-line);
  pointer-events: none;
}

.page-guides .gd-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-6);
  align-items: center;
}

.page-guides .gd-hero-main {
  min-width: 0;
}

.page-guides .gd-hero-eyebrow {
  color: var(--color-contrast-accent);
}

.page-guides .gd-hero-title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  text-wrap: balance;
}

.page-guides .gd-hero-lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

/* 首屏三组刻度 */
.page-guides .gd-groups {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-guides .gd-grouprow {
  display: grid;
  grid-template-columns: 1.5em minmax(0, 1fr) auto;
  grid-template-areas:
    "no name count"
    "ticks ticks ticks";
  align-items: center;
  gap: 6px var(--space-2);
  padding: 12px 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  text-decoration: none;
  color: var(--color-contrast-ink);
  transition: color 160ms ease, border-color 160ms ease;
}

.page-guides .gd-groupno {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-accent);
}

.page-guides .gd-groupname {
  grid-area: name;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.page-guides .gd-groupcount {
  grid-area: count;
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.page-guides .gd-ticks {
  grid-area: ticks;
  display: flex;
  gap: 4px;
}

.page-guides .gd-ticks i {
  display: block;
  width: 22px;
  height: 3px;
  border-radius: 1px;
  background: color-mix(in srgb, var(--color-contrast-accent) 50%, var(--color-contrast-line));
  transition: background 160ms ease;
}

.page-guides .gd-grouprow:hover,
.page-guides .gd-grouprow:focus-visible {
  border-bottom-color: var(--color-contrast-accent);
}

.page-guides .gd-grouprow:hover .gd-ticks i,
.page-guides .gd-grouprow:focus-visible .gd-ticks i {
  background: var(--color-contrast-accent);
}

.page-guides .gd-grouprow:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

/* 首屏图 */
.page-guides .gd-hero-figure {
  margin: 0;
  min-width: 0;
}

.page-guides .gd-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-contrast-line);
}

.page-guides .gd-hero-figure figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ---------- 面包屑 ---------- */
.page-guides .gd-crumbs {
  padding-top: var(--space-3);
  padding-bottom: var(--space-1);
}

/* ---------- 主体骨架 ---------- */
.page-guides .gd-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  padding-top: var(--space-2);
  padding-bottom: var(--section-y-lg);
}

.page-guides .gd-doc {
  min-width: 0;
}

/* ---------- 窄屏章节条 ---------- */
.page-guides .gd-mobbar {
  position: sticky;
  top: 0;
  z-index: 4;
  margin: 0;
  padding: var(--space-1) 0 0;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-guides .gd-mobbar-list {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-1);
  width: max-content;
  min-width: 100%;
}

.page-guides .gd-mobbar-list a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 11px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-guides .gd-mobbar-list a:hover,
.page-guides .gd-mobbar-list a:focus-visible {
  color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line));
}

/* ---------- 侧边目录 ---------- */
.page-guides .gd-toc {
  display: none;
}

.page-guides .gd-toc-inner {
  padding-right: var(--space-2);
}

.page-guides .gd-toc-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-ink);
}

.page-guides .gd-toc-group {
  margin: var(--space-3) 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-guides .gd-toc-group:first-of-type {
  margin-top: 0;
}

.page-guides .gd-toc-ol {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-guides .toc-link {
  display: grid;
  grid-template-columns: 2.1em minmax(0, 1fr);
  gap: 4px;
  margin-left: calc(-1 * var(--space-2) - 1px);
  padding: 6px var(--space-1) 6px var(--space-2);
  border-left: 3px solid transparent;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.45;
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-guides .toc-link:hover,
.page-guides .toc-link:focus-visible {
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary-soft) 55%, transparent);
}

.page-guides .gd-toc-no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-guides .gd-toc-foot {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* 当前章高亮 */
.page-guides:has(#ch-01:target) .toc-link[href="#ch-01"],
.page-guides:has(#ch-02:target) .toc-link[href="#ch-02"],
.page-guides:has(#ch-03:target) .toc-link[href="#ch-03"],
.page-guides:has(#ch-04:target) .toc-link[href="#ch-04"],
.page-guides:has(#ch-05:target) .toc-link[href="#ch-05"],
.page-guides:has(#ch-06:target) .toc-link[href="#ch-06"],
.page-guides:has(#ch-07:target) .toc-link[href="#ch-07"],
.page-guides:has(#ch-08:target) .toc-link[href="#ch-08"],
.page-guides:has(#ch-09:target) .toc-link[href="#ch-09"],
.page-guides:has(#ch-10:target) .toc-link[href="#ch-10"],
.page-guides:has(#ch-11:target) .toc-link[href="#ch-11"],
.page-guides:has(#ch-12:target) .toc-link[href="#ch-12"] {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 60%, transparent);
}

.page-guides:has(#ch-01:target) .toc-link[href="#ch-01"] .gd-toc-no,
.page-guides:has(#ch-02:target) .toc-link[href="#ch-02"] .gd-toc-no,
.page-guides:has(#ch-03:target) .toc-link[href="#ch-03"] .gd-toc-no,
.page-guides:has(#ch-04:target) .toc-link[href="#ch-04"] .gd-toc-no,
.page-guides:has(#ch-05:target) .toc-link[href="#ch-05"] .gd-toc-no,
.page-guides:has(#ch-06:target) .toc-link[href="#ch-06"] .gd-toc-no,
.page-guides:has(#ch-07:target) .toc-link[href="#ch-07"] .gd-toc-no,
.page-guides:has(#ch-08:target) .toc-link[href="#ch-08"] .gd-toc-no,
.page-guides:has(#ch-09:target) .toc-link[href="#ch-09"] .gd-toc-no,
.page-guides:has(#ch-10:target) .toc-link[href="#ch-10"] .gd-toc-no,
.page-guides:has(#ch-11:target) .toc-link[href="#ch-11"] .gd-toc-no,
.page-guides:has(#ch-12:target) .toc-link[href="#ch-12"] .gd-toc-no {
  color: var(--color-accent);
}

/* ---------- 分组 ---------- */
.page-guides .gd-group {
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-group:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-guides .gd-group-head {
  padding-top: var(--space-3);
  border-top: 3px solid var(--color-primary);
  margin-bottom: var(--space-4);
  max-width: var(--measure);
}

.page-guides .gd-group-title {
  margin: var(--space-1) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

.page-guides .gd-group-lead {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 章节 ---------- */
.page-guides .gd-chapter {
  position: relative;
  padding: var(--space-3);
  margin-bottom: var(--gd-chapter-gap);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: transform 160ms ease, border-color 160ms ease;
}

.page-guides .gd-chapter:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--color-primary) 38%, var(--color-line));
}

.page-guides .gd-chapter-title {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-guides .gd-chapter-no {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-guides .gd-chapter-body p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-guides .gd-chapter-body p:last-child {
  margin-bottom: 0;
}

.page-guides .gd-chapter-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-guides .gd-chapter-body a:hover {
  color: var(--color-accent);
}

/* ---------- 要点框 ---------- */
.page-guides .gd-keybox {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary-soft);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 26%, transparent);
  border-radius: var(--radius-sm);
}

.page-guides .gd-keybox-label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-guides .gd-keybox p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink);
}

.page-guides .gd-keybox--alert {
  background: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 32%, transparent);
}

.page-guides .gd-keybox--alert .gd-keybox-label {
  color: var(--color-accent);
}

/* ---------- 字段表 ---------- */
.page-guides .gd-fields {
  margin: var(--space-3) 0 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-field-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-field-name {
  justify-self: start;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  cursor: help;
  border-bottom: var(--border-thin) dashed color-mix(in srgb, var(--color-primary) 48%, transparent);
}

.page-guides .gd-field-val {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 图 ---------- */
.page-guides .gd-figure {
  margin: var(--space-3) 0 0;
}

.page-guides .gd-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-figure figcaption {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.55;
  color: var(--color-ink-muted);
}

/* ---------- 口径提醒 ---------- */
.page-guides .gd-caveat {
  margin-top: var(--space-3);
  padding: 0 var(--space-3);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.page-guides .gd-caveat > summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-guides .gd-caveat > summary::-webkit-details-marker {
  display: none;
}

.page-guides .gd-caveat > summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: 1;
  color: var(--color-primary);
}

.page-guides .gd-caveat[open] > summary::before {
  content: "−";
  color: var(--color-accent);
}

.page-guides .gd-caveat > summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-guides .gd-caveat-body {
  margin: 0;
  padding: 0 0 var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 行内链接段 ---------- */
.page-guides .gd-inline-link {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-primary);
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink-soft);
}

.page-guides .gd-inline-link a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-guides .gd-inline-link a:hover {
  color: var(--color-accent);
}

/* ---------- 速查小结 ---------- */
.page-guides .gd-summary {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 3px solid var(--color-accent);
}

.page-guides .gd-summary-head {
  margin-bottom: var(--space-4);
  max-width: var(--measure);
}

.page-guides .gd-summary-title {
  margin: var(--space-1) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-guides .gd-summary-lead {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-guides .gd-summary-table td:first-child {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  white-space: nowrap;
}

.page-guides .gd-summary-table td:nth-child(2) {
  color: var(--color-ink);
}

.page-guides .gd-summary-table td:nth-child(3) {
  color: var(--color-ink-soft);
}

/* ---------- 延伸阅读 ---------- */
.page-guides .gd-next {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-next-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-guides .gd-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-next-list li {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-guides .gd-next-list a {
  display: grid;
  gap: 4px;
  padding: var(--space-2) 0;
  text-decoration: none;
  transition: padding-left 160ms ease;
}

.page-guides .gd-next-list a:hover,
.page-guides .gd-next-list a:focus-visible {
  padding-left: var(--space-1);
}

.page-guides .gd-next-k {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.page-guides .gd-next-list a:hover .gd-next-k,
.page-guides .gd-next-list a:focus-visible .gd-next-k {
  color: var(--color-accent);
}

.page-guides .gd-next-v {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 锚点偏移 ---------- */
.page-guides .gd-group,
.page-guides .gd-chapter,
.page-guides .gd-summary,
.page-guides .gd-next {
  scroll-margin-top: 72px;
}

/* ---------- 560px 以上 ---------- */
@media (min-width: 560px) {
  .page-guides .gd-field-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr);
    gap: var(--space-2);
    align-items: baseline;
  }

  .page-guides .gd-hero {
    padding: var(--space-8) 0;
  }

  .page-guides .gd-grouprow {
    grid-template-columns: 1.5em minmax(0, 1fr) auto auto;
    grid-template-areas: "no name ticks count";
    gap: var(--space-2);
    padding: var(--space-2) 0;
  }

  .page-guides .gd-ticks {
    grid-area: ticks;
  }

  .page-guides .gd-figure--narrow {
    max-width: 440px;
  }

  .page-guides .gd-next-list a {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
  }
}

/* ---------- 980px 以上：双栏 + 常驻目录 ---------- */
@media (min-width: 980px) {
  .page-guides .gd-shell {
    grid-template-columns: var(--gd-toc-w) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
    padding-top: var(--space-3);
  }

  .page-guides .gd-mobbar {
    display: none;
  }

  .page-guides .gd-toc {
    display: block;
    position: sticky;
    top: 92px;
    align-self: start;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .page-guides .gd-group,
  .page-guides .gd-chapter,
  .page-guides .gd-summary,
  .page-guides .gd-next {
    scroll-margin-top: 100px;
  }

  .page-guides .gd-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: var(--space-8);
    align-items: center;
  }
}

/* ---------- 动效兼容 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-guides .gd-chapter,
  .page-guides .toc-link,
  .page-guides .gd-next-list a {
    transition: none;
  }

  .page-guides .gd-chapter:hover {
    transform: none;
  }
}
<<<END>>>