.page-home {
  --home-gap: clamp(30px, 5vw, 58px);
  --home-ink-soft: #55697a;
  --home-paper-line: #dad5c9;
  --home-coral-deep: #c2441c;
  background: var(--ink);
  color: var(--shell);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
}

/* ---------- 首屏 ---------- */
.home-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-h) + 34px);
  padding-bottom: var(--home-gap);
}

.home-hero__bg {
  position: absolute;
  right: -6%;
  bottom: -14%;
  width: min(860px, 96%);
  opacity: 0.2;
  pointer-events: none;
  z-index: 0;
}

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

.home-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 34, 57, 0.35) 0%, rgba(11, 34, 57, 0) 34%, rgba(11, 34, 57, 0.72) 100%);
}

.home-hero__inner {
  position: relative;
  z-index: 1;
}

.home-hero__kicker {
  display: inline-block;
  margin: 0 0 20px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  background: rgba(18, 49, 79, 0.62);
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--celadon);
}

.home-hero__title {
  margin: 0 0 18px;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3.45rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--shell);
}

.home-hero__lede {
  margin: 0 0 22px;
  max-width: 33em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.8);
}

.home-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--slate);
}

.home-hero__ver {
  color: var(--coral);
  font-weight: 600;
}

.home-hero__sep {
  color: var(--line);
}

/* ---------- 首屏 2x2 目录网格 ---------- */
.home-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 34px;
  background: var(--line);
  border: 1px solid var(--line);
}

.home-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 22px 20px;
  background: var(--ink);
  color: var(--shell);
  text-decoration: none;
  transition: background 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}

.home-card--state {
  background: var(--ink-2);
  box-shadow: inset 2px 0 0 var(--coral);
}

a.home-card:hover,
a.home-card:focus-visible {
  background: var(--ink-2);
  box-shadow: inset 0 0 0 1px var(--coral);
  outline: none;
}

.home-card__top {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.home-card__tag {
  padding: 1px 6px;
  border: 1px solid rgba(255, 107, 74, 0.5);
  font-family: var(--font-data);
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--coral);
  letter-spacing: 0.02em;
}

.home-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.14rem;
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--shell);
}

.home-card__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--slate);
}

.home-card__link {
  align-self: flex-start;
  margin-top: 2px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--coral);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 74, 0.45);
}

.home-card__link:hover {
  border-bottom-color: var(--coral-2);
}

.home-card__steps {
  display: grid;
  gap: 4px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  font-family: var(--font-data);
  font-size: 0.76rem;
  line-height: 1.65;
  color: var(--slate);
  transition: max-height 0.3s var(--ease-out), opacity 0.22s var(--ease-out), margin-top 0.22s var(--ease-out);
}

.home-card__step {
  display: block;
  padding-left: 12px;
  position: relative;
}

.home-card__snum {
  position: absolute;
  left: 0;
  top: 0;
  color: var(--coral-2);
  font-size: 0.7rem;
}

@media (hover: hover) and (pointer: fine) {
  a.home-card:hover .home-card__steps,
  a.home-card:focus-visible .home-card__steps {
    max-height: 170px;
    opacity: 1;
    margin-top: 6px;
  }
}

@media (hover: none) {
  .home-card__steps {
    max-height: none;
    opacity: 1;
    margin-top: 6px;
  }
}

/* ---------- 正文双栏 ---------- */
.home-body {
  padding-top: var(--home-gap);
  padding-bottom: calc(var(--home-gap) + 10px);
}

.home-rail {
  padding-bottom: 26px;
}

.home-rail__label {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.home-rail__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0 0 0 14px;
  border-left: 1px solid var(--line);
}

.home-rail__item {
  position: relative;
  padding: 0 0 18px;
}

.home-rail__item::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 0.66em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--slate);
}

.home-rail__item--now::before {
  background: var(--coral);
  box-shadow: 0 0 0 3px rgba(255, 107, 74, 0.18);
}

.home-rail__ver {
  display: block;
  font-family: var(--font-data);
  font-size: 0.78rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--coral-2);
}

.home-rail__item--now .home-rail__ver {
  color: var(--coral);
  font-weight: 600;
}

.home-rail__txt {
  display: block;
  font-size: 0.82rem;
  line-height: 1.62;
  color: var(--slate);
}

.home-rail__cta {
  display: inline-block;
  font-size: 0.8rem;
}

/* ---------- 章节 ---------- */
.home-chapter {
  padding-top: 28px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

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

.home-chapter + .home-chapter {
  padding-bottom: 4px;
}

.home-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.home-chapter__num {
  flex: none;
  font-family: var(--font-data);
  font-weight: 600;
  font-size: clamp(1.85rem, 4.2vw, 2.55rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--coral);
}

.home-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.7vw, 1.72rem);
  line-height: 1.34;
  letter-spacing: -0.015em;
  color: var(--shell);
}

.home-chapter__meta {
  display: block;
  margin-top: 5px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.home-chapter__body > p {
  margin: 0 0 20px;
  max-width: 37em;
  font-size: 0.97rem;
  line-height: 1.85;
  color: rgba(244, 241, 234, 0.82);
}

/* ---------- 改动清单 ---------- */
.home-changes {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.home-change {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--ink);
}

.home-change__num {
  padding-top: 0.3em;
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--coral);
}

.home-change__text {
  font-size: 0.92rem;
  line-height: 1.72;
  color: rgba(244, 241, 234, 0.86);
}

.home-change__text strong {
  font-weight: 600;
  color: var(--coral-2);
}

/* ---------- 图片 ---------- */
.home-figure {
  margin: 0;
}

.home-figure img,
.home-duo__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.home-figure__cap {
  margin-top: 8px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--slate);
}

/* ---------- 两栏内容块 ---------- */
.home-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-bottom: 26px;
}

.home-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.home-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 11px;
  align-items: start;
}

.home-step__n {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-top: 0.26em;
  background: var(--coral);
  color: var(--ink);
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1;
}

.home-step__t {
  font-size: 0.92rem;
  line-height: 1.72;
  color: rgba(244, 241, 234, 0.84);
}

/* ---------- 排行榜卡片带 ---------- */
.home-rank__note {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 0.73rem;
  letter-spacing: 0.05em;
  color: var(--slate);
}

.home-rank__track {
  display: flex;
  gap: 12px;
  padding-bottom: 12px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--coral) var(--ink-2);
}

.home-rank__track::-webkit-scrollbar {
  height: 4px;
}

.home-rank__track::-webkit-scrollbar-track {
  background: var(--ink-2);
}

.home-rank__track::-webkit-scrollbar-thumb {
  background: var(--coral);
}

.home-rank__card {
  flex: 0 0 min(248px, 74vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: border-color 0.2s var(--ease-out);
}

.home-rank__card:hover {
  border-color: var(--coral);
}

.home-rank__k {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.home-rank__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--shell);
}

.home-rank__desc {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.62;
  color: var(--slate);
}

/* ---------- 纸白对比区 ---------- */
.home-paper {
  margin: 0;
  padding: 24px 20px 26px;
  background: var(--paper);
  color: var(--ink);
}

.home-paper__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.home-paper__sub {
  margin: 0 0 18px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--home-coral-deep);
}

.home-dim__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--home-paper-line);
  border: 1px solid var(--home-paper-line);
}

.home-dim {
  padding: 14px 14px 16px;
  background: var(--paper);
}

.home-dim__k {
  display: block;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--home-coral-deep);
}

.home-dim__title {
  margin: 4px 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.4;
  color: var(--ink);
}

.home-dim__desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.62;
  color: var(--home-ink-soft);
}

.home-paper__foot {
  margin: 18px 0 20px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--home-ink-soft);
}

.home-paper__cta {
  display: inline-block;
  font-size: 0.82rem;
}

/* ---------- 数据事实 ---------- */
.home-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.home-fact {
  padding: 15px 16px;
  background: var(--ink);
}

.home-fact__v {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.24rem, 3.4vw, 1.5rem);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--shell);
}

.home-fact__k {
  display: block;
  margin-top: 4px;
  font-size: 0.81rem;
  line-height: 1.55;
  color: var(--slate);
}

/* ---------- 专栏与答疑 ---------- */
.home-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 4px;
}

.home-col {
  padding: 20px 18px 22px;
  background: var(--ink);
}

.home-col__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--shell);
}

.home-col__list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 7px;
}

.home-col__list li {
  position: relative;
  padding-left: 14px;
  font-size: 0.87rem;
  line-height: 1.62;
  color: rgba(244, 241, 234, 0.72);
}

.home-col__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  background: var(--celadon);
}

.home-col__link {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.79rem;
  color: var(--coral);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 74, 0.4);
}

.home-col__link:hover {
  border-bottom-color: var(--coral-2);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .home-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .home-card {
    padding: 24px 22px;
  }

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

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

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

@media (min-width: 720px) {
  .home-duo {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .home-hero__title {
    font-size: clamp(2.4rem, 5.2vw, 3.45rem);
  }

  .home-paper {
    padding: 30px 28px 32px;
  }
}

@media (min-width: 900px) {
  .home-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    padding-bottom: 0;
  }

  .home-hero {
    padding-top: calc(var(--header-h) + 56px);
  }

  .home-chapter {
    padding-top: 36px;
    margin-top: 36px;
  }

  .home-chapter__head {
    gap: 18px;
    margin-bottom: 22px;
  }
}

@media (min-width: 1100px) {
  .home-grid {
    gap: 1px;
  }

  .home-card {
    padding: 28px 26px 30px;
  }

  .home-card__title {
    font-size: 1.22rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .home-card,
  .page-home .home-card__steps,
  .page-home .home-rank__card {
    transition-duration: 0.01ms;
  }

  @media (hover: hover) and (pointer: fine) {
    a.home-card:hover .home-card__steps,
    a.home-card:focus-visible .home-card__steps {
      max-height: none;
    }
  }
}
<<<END>>>