.page-home {
  --ph-gap: clamp(1.1rem, 3vw, 2rem);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 海报层 ---------- */
.page-home .hero {
  position: relative;
  isolation: isolate;
  padding: calc(var(--header-h) + clamp(2.2rem, 6vw, 4.5rem)) var(--gutter) clamp(2.4rem, 6vw, 4rem);
  background:
    radial-gradient(120% 100% at 88% -10%, rgba(46, 92, 120, 0.55), transparent 62%),
    radial-gradient(90% 80% at -10% 110%, rgba(61, 242, 208, 0.12), transparent 62%),
    var(--ink);
}

.page-home .hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(to bottom, rgba(242, 230, 207, 0.045) 0 1px, transparent 1px 7px);
  opacity: 0.8;
}

.page-home .hero__grid {
  max-width: var(--shell);
  margin-inline: auto;
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
}

.page-home .hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 clamp(1rem, 2.5vw, 1.6rem);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-home .hero__eyebrow::before {
  content: "";
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--orange);
}

.page-home .hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.4rem, 8.4vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--paper-bright);
  text-wrap: balance;
}

.page-home .hero__mark {
  background: linear-gradient(transparent 64%, rgba(255, 107, 53, 0.42) 64%);
  padding-bottom: 0.04em;
}

.page-home .hero__lead {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 36em;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.88;
  color: rgba(242, 230, 207, 0.82);
}

.page-home .hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-home .hero__toc {
  list-style: none;
  margin: clamp(1.8rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-home .hero__toc li {
  border-bottom: 1px solid var(--line-dark);
}

.page-home .hero__toc a {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.72rem 0.1rem;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--ease), padding-left var(--ease), background-color var(--ease);
}

.page-home .hero__toc a:hover,
.page-home .hero__toc a:focus-visible {
  color: var(--cyan);
  padding-left: 0.7rem;
  background: rgba(61, 242, 208, 0.06);
}

.page-home .hero__toc-no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-home .hero__visual {
  position: relative;
  margin: 0;
}

.page-home .hero__visual .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  background: var(--ink-2);
}

.page-home .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-home .hero__chip {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line-dark);
  background: var(--ink-2);
  color: var(--paper-bright);
  white-space: nowrap;
}

.page-home .hero__chip--a {
  top: -0.75rem;
  left: 0;
}

.page-home .hero__chip--b {
  right: 0;
  bottom: 1.1rem;
  background: var(--orange);
  color: var(--ink);
  border-color: var(--ink);
}

/* ---------- 索引层与阅读层 ---------- */
.page-home .doc {
  padding: 0 var(--gutter) clamp(2rem, 6vw, 4rem);
}

.page-home .doc__inner {
  max-width: var(--shell);
  margin-inline: auto;
}

.page-home .doc__rail {
  display: none;
}

.page-home .doc__rail-label {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-home .doc__rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-dark);
}

.page-home .doc__rail-list a {
  display: block;
  padding: 0.5rem 0 0.5rem 0.9rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 0.86rem;
  color: rgba(242, 230, 207, 0.68);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.page-home .doc__rail-list a:hover,
.page-home .doc__rail-list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(61, 242, 208, 0.06);
}

.page-home .doc-section {
  padding-block: clamp(2.2rem, 5vw, 3.8rem);
  border-top: 1px solid var(--line-dark);
}

.page-home .doc-section:first-child {
  border-top: 0;
  padding-top: clamp(2.2rem, 5vw, 3rem);
}

.page-home .doc-section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(0.7rem, 2vw, 1.2rem);
  align-items: start;
  margin-bottom: clamp(1.2rem, 3vw, 1.8rem);
}

.page-home .doc-section__no {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  line-height: 1;
  padding-top: 0.16em;
  color: var(--orange);
}

.page-home .doc-section__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.8vw, 2.15rem);
  line-height: 1.3;
  color: var(--paper-bright);
  text-wrap: balance;
}

.page-home .doc-section p {
  margin: 0 0 1rem;
  max-width: 40em;
  line-height: 1.9;
  color: rgba(242, 230, 207, 0.8);
}

.page-home .doc-section p:last-child {
  margin-bottom: 0;
}

.page-home .doc-section a:not(.button) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 208, 0.45);
  transition: border-color var(--ease);
}

.page-home .doc-section a:not(.button):hover,
.page-home .doc-section a:not(.button):focus-visible {
  border-bottom-color: var(--cyan);
}

.page-home .split {
  display: grid;
  gap: var(--ph-gap);
}

.page-home .split__media {
  margin: 0;
}

.page-home .split__media .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-dark);
  background: var(--ink-2);
}

.page-home .feature-list {
  list-style: none;
  margin: 1.4rem 0;
  padding: 0;
}

.page-home .feature-list > li {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-dark);
}

.page-home .feature-list > li:last-child {
  border-bottom: 1px solid var(--line-dark);
}

.page-home .feature-list h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--paper-bright);
}

.page-home .feature-list p {
  margin: 0;
  max-width: none;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(242, 230, 207, 0.74);
}

/* 双主线卡片 */
.page-home .track-grid {
  display: grid;
  gap: 1px;
  margin: 1.6rem 0;
  border: 1px solid var(--line-dark);
  background: var(--line-dark);
}

.page-home .track {
  display: grid;
  gap: 0.5rem;
  align-content: start;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--ink-2);
  transition: transform var(--ease), background-color var(--ease);
}

.page-home .track:hover {
  transform: translateY(-3px);
}

.page-home .track__label {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-home .track h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.12rem;
  line-height: 1.4;
  color: var(--paper-bright);
}

.page-home .track p {
  margin: 0;
  max-width: none;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(242, 230, 207, 0.76);
}

.page-home .track--paper {
  background: var(--paper);
}

.page-home .track--paper h3 {
  color: var(--ink);
}

.page-home .track--paper p {
  color: rgba(8, 24, 38, 0.76);
}

.page-home .track--paper .track__label {
  color: var(--seal);
}

/* 时间轴 */
.page-home .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-home .timeline > li {
  position: relative;
  padding-top: 1rem;
  border-top: 2px solid var(--archive);
}

.page-home .timeline > li::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.page-home .timeline__time {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-home .timeline h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--paper-bright);
}

.page-home .timeline p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
}

/* 三步 */
.page-home .steps {
  list-style: none;
  margin: 1.4rem 0;
  padding: 0;
}

.page-home .steps > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(0.9rem, 3vw, 1.6rem);
  align-items: start;
  padding: clamp(1rem, 3vw, 1.4rem) 0;
  border-top: 1px solid var(--line-dark);
  transition: background-color var(--ease);
}

.page-home .steps > li:last-child {
  border-bottom: 1px solid var(--line-dark);
}

.page-home .steps > li:hover {
  background: rgba(61, 242, 208, 0.05);
}

.page-home .steps__no {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  line-height: 1;
  color: var(--orange);
}

.page-home .steps h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--paper-bright);
}

.page-home .steps p {
  margin: 0;
  font-size: 0.95rem;
}

/* 数据带 */
.page-home .stat-row {
  display: grid;
  gap: 1px;
  margin: 1.4rem 0;
  border: 1px solid var(--line-dark);
  background: var(--line-dark);
}

.page-home .stat {
  display: grid;
  gap: 0.3rem;
  padding: 1rem 1.1rem;
  background: var(--ink-2);
}

.page-home .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1;
  color: var(--cyan);
}

.page-home .stat__label {
  font-size: 0.8rem;
  color: rgba(242, 230, 207, 0.7);
}

/* 暖沙纸收尾区 */
.page-home .doc-section--paper {
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid var(--line-light);
  background: var(--paper);
  color: var(--ink);
}

.page-home .doc-section--paper .doc-section__no {
  color: var(--seal);
}

.page-home .doc-section--paper .doc-section__title {
  color: var(--ink);
}

.page-home .doc-section--paper p {
  color: rgba(8, 24, 38, 0.8);
}

.page-home .doc-section--paper a:not(.button) {
  color: var(--archive);
  border-bottom-color: rgba(46, 92, 120, 0.45);
}

.page-home .doc-section--paper a:not(.button):hover {
  border-bottom-color: var(--archive);
}

.page-home .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.4rem 0;
}

.page-home .muted-note {
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(8, 24, 38, 0.68);
}

/* 焦点 */
.page-home :focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-home .doc-section--paper :focus-visible {
  outline-color: var(--archive);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-home .stat-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-home .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem 1.6rem;
  }
}

@media (min-width: 900px) {
  .page-home .hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-home .split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-home .split--reverse {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-home .split--reverse .split__media {
    order: 2;
  }

  .page-home .track-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-home .track--paper {
    grid-column: 1 / -1;
  }

  .page-home .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-home .doc__inner {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-home .doc__rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    padding-top: clamp(2.2rem, 5vw, 3rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .track,
  .page-home .hero__toc a,
  .page-home .steps > li {
    transition: none;
  }

  .page-home .track:hover {
    transform: none;
  }
}
<<<END>>>