.page-home {
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏封面 ---------- */
.page-home .cover {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px) var(--gutter) clamp(46px, 7vw, 96px);
  border-bottom: 1px solid var(--rule);
}

.page-home .cover::before,
.page-home .cover::after {
  content: "";
  position: absolute;
  inset: -12% -6%;
  z-index: -2;
  pointer-events: none;
}

.page-home .cover::before {
  background:
    radial-gradient(120% 80% at 6% 0%, rgba(0, 229, 255, .22), transparent 62%),
    linear-gradient(180deg, rgba(23, 26, 43, .92), rgba(11, 14, 20, .1) 72%);
  clip-path: polygon(0 0, 55% 0, 41% 100%, 0 100%);
}

.page-home .cover::after {
  background:
    radial-gradient(120% 80% at 94% 8%, rgba(255, 45, 149, .18), transparent 60%),
    linear-gradient(200deg, rgba(23, 26, 43, .8), transparent 70%);
  clip-path: polygon(55% 0, 100% 0, 100% 100%, 41% 100%);
}

.page-home .cover__ridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 46%;
  z-index: -1;
  opacity: .06;
  background: var(--text);
  pointer-events: none;
  clip-path: polygon(0 100%, 6% 64%, 13% 80%, 22% 42%, 30% 68%, 40% 32%, 50% 60%, 62% 36%, 72% 64%, 82% 44%, 91% 72%, 100% 54%, 100% 100%);
}

.page-home .cover__inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-home .cover__context {
  margin: 0;
  font-size: var(--fs-6);
  letter-spacing: .1em;
  color: var(--gray);
  text-transform: none;
}

.page-home .cover__title {
  margin: .48em 0 .42em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.25rem, 1.05rem + 5.6vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -.03em;
}

.page-home .cover__title-a {
  color: var(--cyan);
  text-shadow: 0 0 42px rgba(0, 229, 255, .38);
}

.page-home .cover__title-b {
  color: var(--magenta);
  text-shadow: 0 0 42px rgba(255, 45, 149, .32);
}

.page-home .cover__title-comma {
  color: var(--gray);
}

.page-home .cover__title-tail {
  display: block;
  margin-top: .2em;
  font-size: .46em;
  letter-spacing: .04em;
  color: rgba(232, 237, 245, .44);
  text-shadow: none;
}

.page-home .cover__lede {
  max-width: 46ch;
  margin: 0;
}

.page-home .cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* 版本切换浮层 */
.page-home .cover__deck {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--panel);
  border: 1px solid var(--rule-strong);
  box-shadow: 0 26px 64px rgba(0, 0, 0, .5);
}

.page-home .cover__deck-art {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .2;
  pointer-events: none;
}

.page-home .cover__deck-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-home .cover__deck-facts {
  display: grid;
  gap: 14px;
  margin: 18px 0 22px;
}

.page-home .cover__deck-facts dt {
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--gray);
}

.page-home .cover__deck-facts dd {
  margin: 5px 0 0;
  font-size: var(--fs-6);
  line-height: 1.72;
  color: var(--text);
}

/* ---------- 章节跳转带 ---------- */
.page-home .chapter-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding: 12px var(--gutter);
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(90deg, rgba(0, 229, 255, .07), rgba(255, 45, 149, .07));
}

.page-home .chapter-jump .toc__title {
  margin: 0;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--gray);
}

.page-home .chapter-jump .toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-home .chapter-jump .toc__list a {
  display: inline-block;
  padding: 4px 0;
  font-size: var(--fs-6);
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-home .chapter-jump .toc__list a:hover,
.page-home .chapter-jump .toc__list a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.page-home .chapter-jump .toc__list a[aria-current="true"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- 通用分区 ---------- */
.page-home .section {
  position: relative;
  padding: clamp(44px, 7vw, 88px) var(--gutter);
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: 96px;
}

.page-home .section .shell {
  position: relative;
}

/* ---------- 分类索引 ---------- */
.page-home .index-art {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  margin: clamp(20px, 3vw, 32px) 0 0;
  border: 1px solid var(--rule);
  object-fit: cover;
  opacity: .82;
}

.page-home .index-wall {
  display: grid;
  gap: 22px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-home .index-group {
  --group-c: var(--cyan);
  display: grid;
  gap: 2px;
  padding-top: 12px;
  border-top: 1px solid var(--rule-strong);
}

.page-home .index-group:nth-child(2) { --group-c: var(--magenta); }
.page-home .index-group:nth-child(3) { --group-c: var(--amber); }
.page-home .index-group:nth-child(4) { --group-c: var(--lime); }

.page-home .index-group__label {
  margin: 0 0 6px;
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--group-c);
}

.page-home .index-card {
  display: block;
  padding: 12px 0 12px 12px;
  border-left: 2px solid var(--rule);
  color: var(--text);
  text-decoration: none;
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}

.page-home .index-card:hover,
.page-home .index-card:focus-visible {
  border-left-color: var(--group-c);
  background: rgba(232, 237, 245, .045);
  transform: translateX(2px);
  outline: none;
}

.page-home .index-card__title {
  display: block;
  font-size: var(--fs-5);
  font-weight: 700;
  letter-spacing: -.005em;
}

.page-home .index-card__text {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-6);
  line-height: 1.66;
  color: var(--gray);
}

.page-home .index-card__more {
  display: block;
  margin-top: 6px;
  font-size: .78rem;
  line-height: 1.66;
  color: rgba(232, 237, 245, .58);
}

/* ---------- 版本节奏 ---------- */
.page-home .section--cadence {
  background:
    linear-gradient(180deg, rgba(14, 59, 62, .88), rgba(14, 59, 62, .3)),
    var(--ink);
}

.page-home .cadence {
  position: relative;
  overflow: hidden;
  margin-top: clamp(22px, 4vw, 38px);
  padding: 10px;
  background: rgba(11, 14, 20, .72);
  border: 1px solid var(--rule);
}

.page-home .cadence__art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  pointer-events: none;
}

.page-home .cadence__svg {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
}

.page-home .cadence__notes {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-home .fold {
  background: rgba(11, 14, 20, .62);
  border: 1px solid var(--rule);
  padding: 0 14px;
  transition: border-color .18s ease;
}

.page-home .fold[open] {
  border-color: var(--rule-strong);
}

.page-home .fold__sum {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: baseline;
  padding: 13px 0;
  font-size: var(--fs-6);
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

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

.page-home .fold__sum .mono {
  color: var(--lime);
  font-size: .78rem;
  letter-spacing: .06em;
}

.page-home .fold__body {
  padding-bottom: 14px;
  font-size: var(--fs-6);
  line-height: 1.75;
  color: var(--gray);
}

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

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

/* ---------- 上手三步 ---------- */
.page-home .start {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-home .steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 4px;
}

.page-home .step {
  display: grid;
  gap: 4px 16px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

.page-home .step__idx {
  margin: 0;
  font-size: var(--fs-3);
  letter-spacing: .06em;
  color: var(--accent);
  line-height: 1;
}

.page-home .step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.3;
}

.page-home .step__body p {
  margin: 0;
  font-size: var(--fs-5);
  line-height: 1.78;
  color: var(--gray);
}

.page-home .step__body a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 237, 245, .28);
}

.page-home .step__body a:hover,
.page-home .step__body a:focus-visible {
  border-bottom-color: var(--accent);
}

.page-home .start__aside {
  padding: 20px;
  border-left: 3px solid var(--magenta);
  background: rgba(255, 45, 149, .06);
}

.page-home .start__aside-title {
  margin: 0 0 14px;
  font-size: var(--fs-6);
  letter-spacing: .08em;
  color: var(--gray);
  font-weight: 600;
}

.page-home .timing {
  display: grid;
  gap: 12px;
  margin: 0 0 16px;
}

.page-home .timing dt {
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--gray);
}

.page-home .timing dd {
  margin: 3px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  color: var(--text);
}

.page-home .start__aside-note {
  margin: 0;
  font-size: var(--fs-6);
  line-height: 1.7;
  color: var(--gray);
}

.page-home .start__aside-note a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 0, .4);
}

/* ---------- 规模数据 ---------- */
.page-home .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-home .stat {
  padding: 18px 14px;
  background: var(--ink);
}

.page-home .stat__num {
  margin: 0;
  font-size: clamp(1.45rem, 1.1rem + 1.5vw, 2.1rem);
  letter-spacing: -.01em;
  color: var(--text);
  line-height: 1.1;
}

.page-home .stat__num span {
  font-size: .52em;
  letter-spacing: 0;
  color: var(--gray);
  margin-left: 2px;
}

.page-home .stat:nth-child(1) .stat__num { color: var(--cyan); }
.page-home .stat:nth-child(4) .stat__num { color: var(--magenta); }
.page-home .stat:nth-child(7) .stat__num { color: var(--amber); }

.page-home .stat__label {
  margin: 7px 0 0;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--gray);
}

.page-home .eco {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 18px 20px;
  border-left: 3px solid var(--lime);
  background: rgba(182, 255, 59, .05);
}

.page-home .eco__title {
  margin: 0 0 8px;
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--lime);
}

.page-home .eco p {
  margin: 0;
  font-size: var(--fs-5);
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 旧版档案 ---------- */
.page-home .section--archive {
  overflow: hidden;
  border-bottom: none;
}

.page-home .archive__art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .17;
  pointer-events: none;
}

.page-home .archive__inner {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-home .archive__title {
  margin: .28em 0 .5em;
  font-family: var(--font-display);
  font-size: var(--fs-2);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-home .archive__lead p {
  margin: 0 0 14px;
  font-size: var(--fs-5);
  line-height: 1.82;
  color: var(--gray);
}

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

.page-home .archive__aside {
  padding: 20px;
  border: 1px solid rgba(255, 179, 0, .34);
  background: rgba(255, 179, 0, .06);
}

.page-home .archive__aside-label {
  margin: 0 0 14px;
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--amber);
}

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

.page-home .archive__list li {
  padding-left: 12px;
  border-left: 1px solid rgba(255, 179, 0, .4);
  font-size: var(--fs-6);
  line-height: 1.7;
  color: var(--text);
}

.page-home .archive__list .mono {
  display: block;
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--amber);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-home .step {
    grid-template-columns: 62px minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 720px) {
  .page-home .index-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 30px;
  }

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

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

  .page-home .index-card__more {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .22s ease, opacity .18s ease, margin-top .22s ease;
  }

  .page-home .index-card:hover .index-card__more,
  .page-home .index-card:focus-visible .index-card__more {
    max-height: 7em;
    margin-top: 6px;
    opacity: 1;
  }
}

@media (min-width: 900px) {
  .page-home .cover__inner {
    grid-template-columns: minmax(0, 1.28fr) minmax(310px, .72fr);
    align-items: end;
  }

  .page-home .cover__deck {
    margin-top: clamp(40px, 8vw, 96px);
  }

  .page-home .start {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, .72fr);
    align-items: start;
  }

  .page-home .archive__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-home .index-wall {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-home .cover__title {
    max-width: 15ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .index-card,
  .page-home .index-card__more,
  .page-home .fold,
  .page-home .chapter-jump .toc__list a {
    transition: none;
  }
}
<<<END>>>