.page-home {
  --home-rail-w: 92px;
  --home-gap: clamp(18px, 2.4vw, 32px);
  --home-radius: var(--radius-md);
  background: var(--ink);
  color: var(--paper);
  min-height: 100vh;
}

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

.page-home .home-shell {
  max-width: var(--measure);
  margin-inline: auto;
  padding: var(--gutter);
  padding-block: 20px 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--home-gap);
}

.page-home .home-body {
  min-width: 0;
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}

/* 版本轨道 */
.page-home .version-rail {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(18, 40, 61, 0.6);
  padding: 10px 12px 8px;
  min-width: 0;
}

.page-home .rail-title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-home .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-home .rail-node {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-home .rail-node:hover,
.page-home .rail-node:focus-visible {
  color: var(--teal);
  border-color: var(--track);
}

.page-home .rail-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--track);
  flex: none;
}

.page-home .rail-num {
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.04em;
}

/* 首屏 */
.page-home .hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(158deg, #12283D 0%, #0B1B2B 72%);
  padding: clamp(20px, 4vw, 44px);
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-home .hero__texture {
  position: absolute;
  inset: 0;
  opacity: 0.32;
  pointer-events: none;
}

.page-home .hero__texture img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-home .hero__grid,
.page-home .collage,
.page-home .hero-track {
  position: relative;
  z-index: 1;
}

.page-home .hero__grid {
  display: grid;
  gap: 26px;
}

.page-home .hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-home .hero__lede {
  margin: 16px 0 0;
  max-width: 34em;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

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

.page-home .hero__stamp {
  display: grid;
  gap: 12px;
  align-content: end;
}

.page-home .hero__version {
  display: block;
  font-size: clamp(62px, 15vw, 108px);
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--teal);
}

.page-home .stamp {
  position: relative;
  display: inline-block;
  justify-self: start;
}

.page-home .revision-chip {
  display: inline-block;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid rgba(232, 169, 75, 0.55);
  background: rgba(232, 169, 75, 0.12);
  color: var(--amber);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: help;
}

.page-home .revision-pop {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  z-index: 6;
  width: min(268px, 82vw);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--track);
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
}

.page-home .revision-pop p {
  margin: 0 0 6px;
}

.page-home .revision-pop p:last-child {
  margin-bottom: 0;
  color: var(--amber);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-home .revision-pop strong {
  color: var(--paper);
}

.page-home .stamp:hover .revision-pop,
.page-home .stamp:focus-within .revision-pop {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* 首屏拼贴卡 */
.page-home .collage {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-home .collage-card {
  padding: 18px 20px;
  border-radius: var(--home-radius);
  border: 1px solid var(--line-soft);
  background: rgba(18, 40, 61, 0.74);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-home .collage-card:hover {
  border-color: rgba(79, 224, 200, 0.6);
  transform: translateY(-2px);
}

.page-home .collage-card__title {
  margin: 10px 0 8px;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--paper);
}

.page-home .collage-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

/* 首屏标签轨道 */
.page-home .hero-track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 4px;
}

.page-home .hero-track__item {
  flex: none;
  scroll-snap-align: start;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.page-home .hero-track__item.is-on {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--ink);
}

/* 章节通用 */
.page-home .chapter {
  padding-block: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--line-soft);
  margin-top: clamp(20px, 4vw, 40px);
}

.page-home .chapter__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
  max-width: 46em;
}

.page-home .chapter__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(23px, 3.4vw, 33px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--paper);
}

.page-home .chapter__desc {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-home .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 四条路线 */
.page-home .path-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-home .path-card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px 18px 18px;
  border-radius: var(--home-radius);
  border: 1px solid var(--line);
  background: linear-gradient(178deg, rgba(18, 40, 61, 0.92), rgba(11, 27, 43, 0.92));
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-home .path-card:hover,
.page-home .path-card:focus-visible {
  border-color: var(--teal);
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.page-home .path-card h3 {
  margin: 4px 0 0;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 700;
}

.page-home .path-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-home .path-card__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
  opacity: 0.85;
  transition: opacity 0.2s var(--ease);
}

.page-home .path-card__go {
  margin-top: auto;
  padding-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

/* 资料库索引 */
.page-home .library {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.page-home .library__figure,
.page-home .device__figure,
.page-home .timeline-figure {
  margin: 0;
  border-radius: var(--home-radius);
  border: 1px solid var(--line-soft);
  background: var(--panel);
  overflow: hidden;
}

.page-home .library__figure img,
.page-home .device__figure img,
.page-home .timeline-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-home .library__figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-home .legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-home .legend__item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: rgba(18, 40, 61, 0.5);
}

.page-home .legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 6px;
}

.page-home .legend__dot--a { background: var(--teal); }
.page-home .legend__dot--b { background: var(--amber); }
.page-home .legend__dot--c { background: var(--sand); }
.page-home .legend__dot--d { background: var(--mint); }

.page-home .legend__item h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-home .legend__item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.72;
}

/* 换设备 */
.page-home .device {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.page-home .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-home .steps__item {
  position: relative;
  padding: 14px 16px 14px 20px;
  border-left: 1px solid var(--track);
  background: linear-gradient(90deg, rgba(30, 58, 82, 0.28), transparent 70%);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-home .steps__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--teal);
  margin-bottom: 6px;
}

.page-home .steps__item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-home .steps__item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

/* 近期改动 */
.page-home .timeline-figure {
  margin-bottom: 18px;
}

.page-home .change-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-home .change {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-home .change__ver {
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.page-home .change__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--paper);
}

.page-home .change__body p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

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

/* 服务与联络 */
.page-home .service-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-home .service-card {
  padding: 18px;
  border-radius: var(--home-radius);
  border: 1px solid var(--line-soft);
  background: rgba(18, 40, 61, 0.55);
  transition: border-color 0.24s var(--ease);
}

.page-home .service-card:hover {
  border-color: rgba(79, 224, 200, 0.55);
}

.page-home .service-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--teal);
}

.page-home .service-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-home .contact-strip {
  margin-top: 22px;
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(232, 169, 75, 0.35);
  background: linear-gradient(140deg, rgba(232, 169, 75, 0.1), rgba(18, 40, 61, 0.7) 60%);
  display: grid;
  gap: 18px;
}

.page-home .contact-strip__info p {
  margin: 0;
}

.page-home .contact-strip__line {
  margin-top: 8px !important;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 40em;
}

.page-home .contact-strip__line strong {
  color: var(--amber);
  font-size: 17px;
}

.page-home .contact-strip__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-home .contact-strip__link {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid var(--track);
  padding-bottom: 2px;
}

.page-home .contact-strip__link:hover {
  color: var(--teal);
  border-color: var(--teal);
}

/* 平板 */
@media (min-width: 700px) {
  .page-home .hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-home .hero__stamp {
    justify-items: end;
    text-align: right;
  }

  .page-home .stamp {
    justify-self: end;
  }

  .page-home .revision-pop {
    left: auto;
    right: 0;
  }

  .page-home .collage {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-home .collage-card--wide { grid-column: span 7; }
  .page-home .collage-card--mid { grid-column: span 5; margin-top: 18px; }
  .page-home .collage-card--slim { grid-column: span 8; }

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

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

  .page-home .contact-strip {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-home .contact-strip__actions {
    justify-content: flex-end;
  }
}

/* 桌面 */
@media (min-width: 960px) {
  .page-home .home-shell {
    grid-template-columns: var(--home-rail-w) minmax(0, 1fr);
    gap: 40px;
    padding-block: 32px 88px;
  }

  .page-home .version-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    background: none;
    border: 0;
    border-radius: 0;
    padding: 6px 0 0;
  }

  .page-home .rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-home .rail-node {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding: 16px 0 16px 18px;
    border-radius: 0;
    border-left: 1px solid var(--line);
    border-top: 0;
    border-right: 0;
    border-bottom: 0;
    position: relative;
    white-space: normal;
  }

  .page-home .rail-node:hover,
  .page-home .rail-node:focus-visible {
    border-left-color: var(--teal);
  }

  .page-home .rail-dot {
    position: absolute;
    left: -4px;
    top: 22px;
    width: 7px;
    height: 7px;
  }

  .page-home .rail-node:hover .rail-dot {
    background: var(--teal);
  }

  .page-home .library {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: 24px;
  }

  .page-home .device {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 28px;
  }

  .page-home .change {
    grid-template-columns: 72px minmax(0, 1fr);
  }
}

@media (min-width: 1140px) {
  .page-home .path-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-home .path-card:nth-child(2) { margin-top: 22px; }
  .page-home .path-card:nth-child(4) { margin-top: 44px; }

  .page-home .collage-card--wide { grid-column: span 6; }
  .page-home .collage-card--mid { grid-column: span 3; }
  .page-home .collage-card--slim { grid-column: span 3; margin-top: 34px; }
}

@media (max-width: 699px) {
  .page-home .revision-pop {
    position: static;
    width: auto;
    margin-top: 10px;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .page-home .hero__stamp {
    justify-items: start;
    text-align: left;
  }

  .page-home .path-card__hint {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .collage-card,
  .page-home .path-card,
  .page-home .revision-pop,
  .page-home .rail-node {
    transition-duration: 0.01ms;
  }

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