.page-home {
  --home-gap: clamp(1rem, 3vw, 2rem);
  --home-line-tick: repeating-linear-gradient(to bottom, var(--grid-blue) 0 8px, transparent 8px 20px);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

.page-home .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-home .breadcrumbs__current {
  color: var(--text);
}

.page-home .breadcrumbs__sep {
  color: var(--grid-blue);
}

/* ---------- 首屏框景 ---------- */
.page-home .hero {
  position: relative;
  padding: 1.25rem 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(57, 230, 208, 0.12), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 180, 95, 0.08), transparent 60%),
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px) 0 0 / 96px 96px,
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px) 0 0 / 96px 96px,
    var(--ink-950);
}

.page-home .tick-frame {
  position: relative;
  padding: clamp(1rem, 3.2vw, 2.75rem);
  border: 1px solid var(--line);
  background: rgba(12, 27, 42, 0.62);
  box-shadow: var(--shadow-hard);
}

.page-home .tick-frame::before,
.page-home .tick-frame::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 2px solid var(--signal-cyan);
  opacity: 0.85;
  pointer-events: none;
}

.page-home .tick-frame::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}

.page-home .tick-frame::after {
  right: -2px;
  bottom: -2px;
  border-left: 0;
  border-top: 0;
}

.page-home .hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-home .hero__title {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.35rem, 7.6vw, 5.25rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--frost);
}

.page-home .hero__lead {
  max-width: 46ch;
  margin: 0 0 1.5rem;
  font-size: var(--step-18);
  line-height: 1.75;
  color: var(--text);
}

.page-home .hero__changes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.7rem;
  margin-bottom: 1.6rem;
}

.page-home .change-hint {
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--signal-cyan);
  background: var(--surface);
}

.page-home .change-hint--amber {
  border-left-color: var(--amber);
}

.page-home .change-hint__no {
  display: block;
  margin-bottom: 0.35rem;
  font-size: var(--step-12);
  letter-spacing: 0.14em;
  color: var(--signal-cyan);
}

.page-home .change-hint--amber .change-hint__no {
  color: var(--amber);
}

.page-home .change-hint p {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.65;
  color: var(--text);
}

.page-home .hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-home .hero__figure {
  margin: 0;
  min-width: 0;
}

.page-home .hero__figure .frame-figure__media {
  aspect-ratio: 16 / 10;
}

.page-home .frame-figure__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-home .hero__stamp {
  margin: 1.5rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line-soft);
  font-size: var(--step-12);
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* ---------- 信号条 ---------- */
.page-home .signal-band {
  border-bottom: 1px solid var(--line);
  background: var(--ink-900);
}

.page-home .signal-band__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin: 0;
  padding: 1.5rem 0;
  list-style: none;
}

.page-home .signal-band__item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--grid-blue);
}

.page-home .signal-band__num {
  font-family: var(--font-display);
  font-size: var(--step-36);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal-cyan);
}

.page-home .signal-band__text {
  font-size: var(--step-14);
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 通用章节 ---------- */
.page-home .section {
  padding: clamp(2.75rem, 6vw, 5rem) 0;
}

.page-home .section-head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-home .section-head__note {
  margin: 0.75rem 0 0;
  font-size: var(--step-16);
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 新旧对照 ---------- */
.page-home .changes {
  background: var(--ink-950);
}

.page-home .changes__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-home .change-card {
  min-width: 0;
  padding: 1.25rem 1.15rem 1.4rem;
  border: 1px solid var(--line);
  background: var(--surface);
}

.page-home .change-card--new {
  border-top: 2px solid var(--signal-cyan);
}

.page-home .change-card--old {
  border-top: 2px solid var(--amber);
}

.page-home .change-card__head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.9rem;
}

.page-home .change-card__ref {
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-home .change-card__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: var(--step-24);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-home .change-card__list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-home .change-card__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.7rem;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--line-soft);
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--text);
}

.page-home .change-card__dot {
  font-size: var(--step-12);
  letter-spacing: 0.1em;
  color: var(--sage);
}

.page-home .change-card--new .change-card__dot {
  color: var(--signal-cyan);
}

.page-home .change-card--old .change-card__dot {
  color: var(--amber);
}

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

.page-home .changes__figure {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

/* ---------- 面板索引 ---------- */
.page-home .atlas {
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-home .atlas__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-home .atlas-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  height: 100%;
  padding: 1.15rem 1.1rem 1.25rem;
  border: 1px solid var(--line);
  background: var(--ink-950);
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-home .atlas-card__no {
  font-size: var(--step-12);
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-home .atlas-card__label {
  font-family: var(--font-display);
  font-size: var(--step-24);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-home .atlas-card__desc {
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--text-dim);
}

.page-home .atlas-card__meta {
  margin-top: auto;
  padding-top: 0.6rem;
  border-top: 1px solid var(--line-soft);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--signal-cyan);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-home .atlas-card:hover,
.page-home .atlas-card:focus-visible {
  border-color: var(--signal-cyan);
  background: var(--ink-800);
  transform: translateY(-2px);
}

.page-home .atlas-card:hover .atlas-card__meta,
.page-home .atlas-card:focus-visible .atlas-card__meta {
  opacity: 1;
  transform: translateY(0);
}

.page-home .atlas-card:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 3px;
}

@media (hover: none) {
  .page-home .atlas-card__meta {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 设备差异 ---------- */
.page-home .devices {
  background: var(--bg);
}

.page-home .devices__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.page-home .devices__figure {
  margin: 0;
  min-width: 0;
}

.page-home .devices__media {
  aspect-ratio: 9 / 11;
}

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

.page-home .devices__lead {
  margin: 0.75rem 0 1.5rem;
  font-size: var(--step-16);
  line-height: 1.8;
  color: var(--text);
}

.page-home .device-tabs {
  position: relative;
  border: 1px solid var(--line);
  background: var(--surface);
}

.page-home .device-tabs__input {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-home .device-tabs__bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line);
}

.page-home .device-tabs__bar label {
  display: block;
  padding: 0.8rem 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  text-align: center;
  color: var(--text-dim);
  cursor: pointer;
  border-right: 1px solid var(--line-soft);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-home .device-tabs__bar label:last-child {
  border-right: 0;
}

.page-home .device-tabs__bar label:hover {
  background: var(--ink-800);
  color: var(--text);
}

.page-home .device-tabs__panel {
  display: none;
  padding: 1.15rem 1.1rem 1.25rem;
}

.page-home .device-tabs__panel p {
  margin: 0 0 0.75rem;
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--text);
}

.page-home .device-tabs__note {
  margin: 0;
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-home #device-desk:checked ~ .device-tabs__bar label[for="device-desk"] {
  background: var(--signal-cyan);
  color: var(--ink-950);
}

.page-home #device-ios:checked ~ .device-tabs__bar label[for="device-ios"] {
  background: var(--amber);
  color: var(--ink-950);
}

.page-home #device-desk:checked ~ .device-tabs__panel--desk,
.page-home #device-ios:checked ~ .device-tabs__panel--ios {
  display: block;
}

.page-home #device-desk:focus-visible ~ .device-tabs__bar label[for="device-desk"],
.page-home #device-ios:focus-visible ~ .device-tabs__bar label[for="device-ios"] {
  outline: 2px solid var(--signal-cyan);
  outline-offset: -3px;
}

.page-home .devices__link {
  margin: 1.25rem 0 0;
}

.page-home .devices__anchor {
  font-size: var(--step-14);
  color: var(--signal-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-signal);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-home .devices__anchor:hover,
.page-home .devices__anchor:focus-visible {
  border-color: var(--signal-cyan);
  color: var(--frost);
}

/* ---------- 三步路径 ---------- */
.page-home .path {
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}

.page-home .path__steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-home .path-step {
  position: relative;
  padding: 1.15rem 1.1rem 1.3rem;
  border: 1px solid var(--line);
  background: var(--surface-raised);
}

.page-home .path-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--signal-cyan);
}

.page-home .path-step__no {
  display: block;
  font-size: var(--step-12);
  letter-spacing: 0.14em;
  color: var(--signal-cyan);
}

.page-home .path-step h3 {
  margin: 0.5rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: var(--step-24);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-home .path-step p {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-home .path__figure {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

/* ---------- 收束 ---------- */
.page-home .closing {
  border-top: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(57, 230, 208, 0.1), transparent 55%),
    var(--ink-950);
}

.page-home .closing__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  align-items: center;
}

.page-home .closing__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--frost);
}

.page-home .closing__text {
  max-width: 52ch;
  margin: 0;
  font-size: var(--step-16);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-home .closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 640px) {
  .page-home .hero__changes {
    grid-template-columns: 1fr 1fr;
  }

  .page-home .signal-band__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-home .hero {
    padding-top: 1.75rem;
  }

  .page-home .hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 2.5rem;
  }

  .page-home .changes__grid {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 0;
    align-items: stretch;
  }

  .page-home .changes__spine {
    display: block;
    position: relative;
    width: 1px;
    margin: 0 2rem;
    background: var(--line);
  }

  .page-home .changes__spine::before {
    content: "";
    position: absolute;
    inset: 0 -4px;
    background: var(--home-line-tick);
  }

  .page-home .changes__spine-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-90deg);
    padding: 0.35rem 0.6rem;
    border: 1px solid var(--line);
    background: var(--ink-950);
    font-size: var(--step-12);
    letter-spacing: 0.14em;
    white-space: nowrap;
    color: var(--text-dim);
  }

  .page-home .atlas__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-home .atlas__list > li {
    grid-column: span 3;
  }

  .page-home .atlas__list > li:nth-child(n + 3) {
    grid-column: span 2;
  }

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

  .page-home .path__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-home .closing__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .atlas-card,
  .page-home .atlas-card__meta,
  .page-home .device-tabs__bar label,
  .page-home .devices__anchor {
    transition: none;
  }
}
<<<END>>>