.page-home {
  --home-axis-w: 236px;
  --home-gap: clamp(24px, 3vw, 44px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  overflow-x: clip;
}

.page-home h1,
.page-home h2,
.page-home h3,
.page-home p,
.page-home ul,
.page-home ol,
.page-home dl,
.page-home dd,
.page-home figure {
  margin: 0;
  padding: 0;
}

.page-home img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-home ul,
.page-home ol {
  list-style: none;
}

/* ---------- 首屏 ---------- */
.page-home .hero {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: calc(var(--header-h) + 36px) var(--gutter) clamp(44px, 6vw, 76px);
  display: grid;
  gap: clamp(30px, 4vw, 52px);
}

.page-home .hero-copy {
  display: grid;
  gap: 22px;
  align-content: start;
  min-width: 0;
}

.page-home .hero-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-home .hero-kicker span {
  color: var(--cinnabar);
}

.page-home .hero-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(44px, 12vw, 118px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-home .hero-title em {
  font-style: normal;
  color: var(--cinnabar);
}

.page-home .hero-lede {
  max-width: 46ch;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
}

.page-home .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-home .hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-home .hero-meta div {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-home .hero-meta dd {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.page-home .hero-meta dt {
  font-size: 12px;
  color: var(--ink-soft);
}

.page-home .hero-figure {
  position: relative;
  overflow: hidden;
  background: var(--white);
  min-height: 220px;
}

.page-home .hero-figure img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

.page-home .hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.55;
  pointer-events: none;
}

.page-home .hero-note {
  display: none;
}

/* ---------- 索引轴 + 内容流 ---------- */
.page-home .scroll-shell {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(56px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-home .axis {
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  padding: 12px 0 8px;
}

.page-home .axis-summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-home .axis-summary::-webkit-details-marker {
  display: none;
}

.page-home .axis-hint {
  font-size: 11px;
  letter-spacing: 0.06em;
  opacity: 0.7;
}

.page-home .axis-list {
  display: grid;
  gap: 2px;
  margin-top: 12px;
}

.page-home .axis-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-home .axis-link:hover {
  color: var(--cinnabar);
}

.page-home .axis-link[aria-current="true"] {
  color: var(--cinnabar);
  border-left-color: var(--cinnabar);
}

.page-home .axis-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.6;
}

.page-home .flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-home .chapter {
  padding: clamp(32px, 5vw, 56px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-home .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-home .chapter-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-home .chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cinnabar);
}

.page-home .chapter-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-home .chapter-lede {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 两条主线 ---------- */
.page-home .lanes {
  display: grid;
  gap: 20px;
}

.page-home .lane {
  background: var(--white);
  border-top: 2px solid var(--ink);
  padding: 24px 22px;
}

.page-home .lane--alt {
  border-top-color: var(--cinnabar);
}

.page-home .lane-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
}

.page-home .lane h3 {
  font-family: var(--font-display);
  font-size: 21px;
  line-height: 1.4;
  margin: 10px 0 12px;
  color: var(--ink);
}

.page-home .lane p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.page-home .lane ul {
  display: grid;
  gap: 8px;
}

.page-home .lane li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-home .lane li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--celadon);
}

/* ---------- 栏目长卷 ---------- */
.page-home .home-figure {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-home .columns {
  border-top: 1px solid var(--line-strong);
}

.page-home .column-link {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: baseline;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-home .column-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  background: var(--cinnabar);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms var(--ease);
}

.page-home .column-link:hover {
  color: var(--cinnabar-deep);
}

.page-home .column-link:hover::after {
  transform: scaleX(1);
}

.page-home .column-no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
  opacity: 0.65;
}

.page-home .column-name {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
}

.page-home .column-arrow {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cinnabar);
}

.page-home .column-desc {
  grid-column: 2 / -1;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- V3 版本 ---------- */
.page-home .version {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(24px, 4vw, 48px);
}

.page-home .version::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-light) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-light) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.5;
  pointer-events: none;
}

.page-home .version-inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.page-home .version-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-home .version-num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 84px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--white);
  margin: 10px 0 0;
}

.page-home .version-note {
  margin-top: 14px;
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(247, 243, 234, 0.74);
}

.page-home .version-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-home .version-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 243, 234, 0.88);
}

.page-home .version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 12px;
  height: 1px;
  background: var(--gold);
}

.page-home .version-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-home .version-tags span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border: 1px solid rgba(199, 162, 90, 0.55);
  color: var(--gold);
}

.page-home .version-years {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(247, 243, 234, 0.6);
}

.page-home .version-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 26px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--gold);
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-home .version-link:hover {
  color: var(--gold);
}

.page-home .version-figure {
  align-self: stretch;
}

.page-home .version-figure img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
  border: 1px solid var(--line-light);
}

/* ---------- 换设备三步 ---------- */
.page-home .switch-grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.page-home .steps {
  display: grid;
  gap: 18px;
}

.page-home .step {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.page-home .step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--celadon);
}

.page-home .step-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-home .step h3 {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.4;
  margin: 8px 0 8px;
  color: var(--ink);
}

.page-home .step p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-home .compat {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-home .compat span {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
}

.page-home .switch-cta {
  margin-top: 22px;
}

.page-home .switch-figure {
  background: var(--white);
}

.page-home .switch-figure img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 服务与联系 ---------- */
.page-home .reach {
  background: var(--white);
  border-top: 3px solid var(--cinnabar);
  padding: clamp(22px, 4vw, 44px);
}

.page-home .reach-stats {
  display: grid;
  gap: 18px;
}

.page-home .reach-stat strong {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-home .reach-stat span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-home .reach-contact {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-home .reach-item {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-home .reach-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.page-home .copy-btn {
  justify-self: start;
  background: none;
  border: 0;
  border-bottom: 1px dashed var(--line-strong);
  padding: 0 0 2px;
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  word-break: break-all;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-home .copy-btn:hover {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
}

.page-home .reach-note {
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-home .reach-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 20px;
}

.page-home .reach-link {
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-home .reach-link:hover {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
}

.page-home .legal-line {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-home .lanes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-home .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-home .reach-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-home .reach-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-home .hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    padding-top: calc(var(--header-h) + 60px);
  }

  .page-home .hero-figure {
    min-height: 360px;
  }

  .page-home .hero-figure img {
    min-height: 360px;
  }

  .page-home .version-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-home .switch-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-home .scroll-shell {
    grid-template-columns: var(--home-axis-w) minmax(0, 1fr);
    gap: var(--home-gap);
  }

  .page-home .axis {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-home .axis-summary {
    cursor: default;
  }

  .page-home .axis-hint {
    display: none;
  }
}

@media (min-width: 1200px) {
  .page-home .hero-note {
    display: block;
    position: absolute;
    left: 8px;
    top: calc(var(--header-h) + 96px);
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.34em;
    color: var(--ink-soft);
    opacity: 0.6;
  }
}