.page-home .hero {
  padding: clamp(1.75rem, 5vw, 3.5rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-home .hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
}

.page-home .hero__title {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.05;
  font-size: clamp(1.95rem, 6.2vw, 4rem);
  color: var(--white);
  margin: .9rem 0 1rem;
  max-width: 22ch;
}

.page-home .hero__lead {
  color: rgba(242, 246, 247, .78);
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  max-width: 64ch;
}

/* 首屏左右对开 */
.page-home .split {
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-home .split__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  padding: clamp(1.1rem, 3.2vw, 2rem);
  background: var(--graphite);
  transition: opacity .22s ease, background .22s ease;
}

.page-home .split__panel--old {
  background: linear-gradient(180deg, rgba(107, 124, 140, .18), rgba(27, 42, 56, .96));
}

.page-home .split__panel--new {
  background: linear-gradient(180deg, var(--cyan-08), rgba(27, 42, 56, .96));
}

.page-home .split:hover .split__panel:not(:hover) {
  opacity: .4;
}

.page-home .split:focus-within .split__panel {
  opacity: 1;
}

.page-home .split:focus-within .split__panel:not(:focus-within) {
  opacity: .4;
}

.page-home .split__title {
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0;
}

.page-home .split__desc {
  margin: 0;
  color: rgba(242, 246, 247, .74);
  font-size: .95rem;
  line-height: 1.75;
}

.page-home .split__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0;
  padding: 0;
}

.page-home .split__facts li {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  padding: .28rem .5rem;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-tag);
  color: rgba(242, 246, 247, .7);
}

.page-home .split__panel--old .split__facts li {
  border-color: var(--old-35);
}

.page-home .split__link {
  margin-top: auto;
  align-self: flex-start;
}

/* 路径折线 */
.page-home .route-line {
  display: block;
  width: 100%;
  height: auto;
  margin: .3rem 0;
}

.page-home .route-line path {
  fill: none;
  stroke-width: 2;
  stroke-linecap: square;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: home-route 1.6s ease .25s forwards;
}

.page-home .route-line--old path {
  stroke: var(--old);
}

.page-home .route-line--new path {
  stroke: var(--cyan);
}

.page-home .route-line circle {
  fill: var(--coral);
}

@keyframes home-route {
  to { stroke-dashoffset: 0; }
}

/* 图像容器 */
.page-home .media-frame {
  margin: 0;
  border: 1px solid var(--grid-line);
  background: var(--indigo);
  overflow: hidden;
}

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

.page-home .media-caption {
  padding: .7rem .9rem;
  border-top: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
  line-height: 1.6;
  color: rgba(242, 246, 247, .6);
}

.page-home .hero__figure {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

/* 分区标题带 */
.page-home .section-head__main {
  min-width: 0;
}

.page-home .section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  letter-spacing: -.01em;
  line-height: 1.15;
  color: var(--white);
  margin: .4rem 0 0;
}

.page-home .section-head__note {
  margin: 0;
  max-width: 46ch;
  font-size: .88rem;
  line-height: 1.75;
  color: rgba(242, 246, 247, .6);
}

/* 三条常用路径 */
.page-home .paths__list {
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-home .path-card {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  background: var(--graphite);
  color: inherit;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-home .path-card:hover,
.page-home .path-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-home .path-card__index {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-home .path-card h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  letter-spacing: -.005em;
  color: var(--white);
  margin: 0;
}

.page-home .path-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.72;
  color: rgba(242, 246, 247, .72);
}

.page-home .path-card__steps {
  margin-top: auto;
  padding-top: .6rem;
  border-top: 1px dashed var(--grid-line);
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--cyan-mist);
}

.page-home .path-card__more {
  font-size: .82rem;
  letter-spacing: .02em;
  color: var(--coral);
}

/* 版本时间轴 */
.page-home .timeline {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-home .timeline__item {
  position: relative;
  padding-top: 1.5rem;
  border-top: 1px solid var(--grid-line);
  outline-offset: 6px;
}

.page-home .timeline__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--old);
  box-shadow: 0 0 0 3px var(--indigo);
  transition: background .18s ease;
}

.page-home .timeline__item--current::before {
  background: var(--amber);
}

.page-home .timeline__item:hover::before,
.page-home .timeline__item:focus-within::before {
  background: var(--cyan);
}

.page-home .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-home .timeline__item h3 {
  font-family: var(--font-head);
  font-size: 1.15rem;
  letter-spacing: -.005em;
  color: var(--white);
  margin: .35rem 0 .35rem;
}

.page-home .timeline__tip {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: rgba(242, 246, 247, .66);
}

.page-home .timeline__figure {
  margin-top: clamp(1.5rem, 3.5vw, 2.5rem);
}

/* 设备对照 */
.page-home .devices__grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  align-items: start;
}

.page-home .devices__text h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  letter-spacing: -.01em;
  line-height: 1.15;
  color: var(--white);
  margin: .4rem 0 .9rem;
}

.page-home .devices__text > p {
  margin: 0;
  max-width: 58ch;
  font-size: .95rem;
  line-height: 1.8;
  color: rgba(242, 246, 247, .74);
}

.page-home .dev-steps {
  position: relative;
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0 0 0 1.4rem;
  border-left: 1px solid var(--grid-line);
}

.page-home .dev-step {
  position: relative;
  padding-bottom: 1.1rem;
}

.page-home .dev-step:last-child {
  padding-bottom: 0;
}

.page-home .dev-step::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: .4rem;
  margin-left: -4.5px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
}

.page-home .dev-step strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.02rem;
  letter-spacing: .01em;
  color: var(--white);
}

.page-home .dev-step span {
  display: block;
  margin-top: .2rem;
  font-size: .88rem;
  line-height: 1.7;
  color: rgba(242, 246, 247, .66);
}

.page-home .devices__link {
  margin-top: 1.4rem;
}

.page-home .devices__figure {
  justify-self: stretch;
}

/* 内容地图索引 */
.page-home .index-list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--grid-line);
}

.page-home .index-item a {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: .3rem .9rem;
  align-items: baseline;
  padding: 1rem .35rem;
  border-bottom: 1px solid var(--grid-line);
  text-decoration: none;
  color: inherit;
  transition: background .18s ease;
}

.page-home .index-item a:hover,
.page-home .index-item a:focus-visible {
  background: var(--cyan-06);
}

.page-home .index-item__no {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  transition: color .18s ease;
}

.page-home .index-item a:hover .index-item__no,
.page-home .index-item a:focus-visible .index-item__no {
  color: var(--coral);
}

.page-home .index-item__label {
  font-family: var(--font-head);
  font-size: 1.15rem;
  letter-spacing: .02em;
  color: var(--cyan-mist);
}

.page-home .index-item__desc {
  grid-column: 2;
  font-size: .9rem;
  line-height: 1.72;
  color: rgba(242, 246, 247, .7);
}

.page-home .index-item__code {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--old);
}

/* 主路径收束 */
.page-home .closing__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: center;
  justify-content: space-between;
  margin-top: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(1.1rem, 3vw, 1.75rem);
  border: 1px solid var(--grid-line);
  background: var(--indigo);
}

.page-home .closing__copy {
  min-width: 0;
  max-width: 56ch;
}

.page-home .closing__copy h2 {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  letter-spacing: -.01em;
  color: var(--white);
  margin: .4rem 0 .5rem;
}

.page-home .closing__copy p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: rgba(242, 246, 247, .72);
}

.page-home .closing__copy .num {
  color: var(--cyan);
  font-weight: 700;
}

.page-home .closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* 平板与桌面 */
@media (min-width: 900px) {
  .page-home .split {
    grid-template-columns: 1fr 1fr;
  }

  .page-home .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }

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

@media (min-width: 820px) {
  .page-home .paths__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-home .index-item a {
    grid-template-columns: 3.2rem 11rem minmax(0, 1fr) 8rem;
    gap: .4rem 1.2rem;
  }

  .page-home .index-item__desc,
  .page-home .index-item__code {
    grid-column: auto;
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-home .timeline__tip {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .25s ease, opacity .25s ease;
  }

  .page-home .timeline__item:hover .timeline__tip,
  .page-home .timeline__item:focus-within .timeline__tip {
    max-height: 9rem;
    opacity: 1;
  }
}

/* 窄屏收口 */
@media (max-width: 480px) {
  .page-home .split__link {
    align-self: stretch;
    text-align: center;
  }

  .page-home .closing__actions {
    width: 100%;
  }

  .page-home .closing__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .route-line path {
    animation: none;
    stroke-dashoffset: 0;
  }

  .page-home .path-card,
  .page-home .split__panel,
  .page-home .timeline__tip {
    transition: none;
  }

  .page-home .path-card:hover,
  .page-home .path-card:focus-visible {
    transform: none;
  }
}