/* ===== 首页 · 专题封面 ===== */
.page-home {
  --home-hair: 1px solid var(--orbit);
}

/* --- 首屏：4/8 非对称封面 --- */
.page-home .home-cover {
  padding: 34px 0 0;
}

.page-home .home-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-home .home-rail {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: var(--home-hair);
}

.page-home .home-rail__block {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-home .home-rail__lead {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.75;
  color: var(--mist-soft);
  max-width: 26em;
}

.page-home .home-rail__paths {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-home .home-rail__paths a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-left: 1px solid var(--orbit);
  color: var(--mist);
  text-decoration: none;
  font-size: var(--fs-aux);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-home .home-rail__paths a .mono {
  font-size: var(--fs-tiny);
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-home .home-rail__paths a:hover,
.page-home .home-rail__paths a:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background-color: rgba(53, 224, 208, .07);
  transform: translateX(3px);
}

.page-home .home-rail__paths a[aria-current] {
  color: var(--paper);
  border-left-color: var(--gold);
  background-color: rgba(138, 92, 246, .10);
}

.page-home .home-rail__back {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-home .home-rail__back-node {
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan);
  display: inline-block;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-home .home-rail__back:hover {
  color: var(--cyan);
}

.page-home .home-rail__back:hover .home-rail__back-node {
  background-color: var(--cyan);
  box-shadow: 0 0 10px rgba(53, 224, 208, .55);
}

.page-home .home-cover__main {
  display: flex;
  flex-direction: column;
  padding-bottom: 46px;
}

.page-home .home-cover__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  margin-bottom: 22px;
}

.page-home .home-cover__meta .eyebrow {
  margin: 0;
}

.page-home .home-cover__index {
  font-size: var(--fs-tiny);
  letter-spacing: .08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-home .home-cover__index:hover {
  border-bottom-color: var(--cyan);
}

/* 版本徽标 */
.page-home .home-badge {
  position: relative;
  display: inline-block;
}

.page-home .home-badge > summary {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 14px;
  border: 1px solid var(--gold);
  background-color: rgba(232, 196, 106, .07);
  color: var(--gold);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-home .home-badge > summary::-webkit-details-marker {
  display: none;
}

.page-home .home-badge > summary:hover,
.page-home .home-badge[open] > summary {
  background-color: rgba(232, 196, 106, .18);
  box-shadow: inset 0 0 0 1px rgba(232, 196, 106, .35);
}

.page-home .home-badge__label {
  font-size: var(--fs-tiny);
  letter-spacing: .1em;
}

.page-home .home-badge__num {
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: .04em;
}

.page-home .home-badge__panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 20;
  width: min(330px, 82vw);
  padding: 16px 18px;
  background-color: var(--nebula);
  border: 1px solid var(--orbit);
  border-left: 2px solid var(--gold);
}

.page-home .home-badge__panel-title {
  margin: 0 0 8px;
  font-size: var(--fs-tiny);
  letter-spacing: .06em;
  color: var(--gold);
}

.page-home .home-badge__panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-home .home-badge__panel li {
  font-size: var(--fs-tiny);
  line-height: 1.7;
  color: var(--mist);
  padding-left: 12px;
  position: relative;
}

.page-home .home-badge__panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 5px;
  height: 1px;
  background-color: var(--cyan);
}

/* 首屏标题与导语 */
.page-home .home-cover h1 {
  margin: 0 0 20px;
  font-family: var(--font-title);
  font-size: clamp(30px, 6.2vw, var(--fs-xl));
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--paper);
  max-width: 18em;
}

.page-home .home-cover__lede {
  margin: 0 0 26px;
  font-family: var(--font-serif);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--mist);
  max-width: 38em;
}

.page-home .home-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.page-home .home-cover__figure {
  margin: 0;
}

.page-home .home-cover__figure .figure__frame {
  aspect-ratio: 16 / 10;
}

/* --- 三步入口 --- */
.page-home .home-steps {
  padding: 52px 0 58px;
  background-color: var(--nebula);
  border-top: var(--home-hair);
  border-bottom: var(--home-hair);
}

.page-home .home-steps__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-home .home-steps__aside h2 {
  margin: 10px 0 14px;
  font-family: var(--font-title);
  font-size: clamp(24px, 4.4vw, var(--fs-md));
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-home .home-steps__text {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.85;
  color: var(--mist);
  max-width: 30em;
}

.page-home .home-steps__track {
  display: block;
  width: 100%;
  height: 4px;
  margin-bottom: -1px;
}

.page-home .home-steps__track line {
  stroke: var(--orbit);
  stroke-width: 2;
}

.page-home .home-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-home .home-step {
  position: relative;
  padding: 22px 0 26px;
  border-top: var(--home-hair);
}

.page-home .home-step__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 9px;
  text-decoration: none;
}

.page-home .home-step__link::after {
  content: "";
  position: absolute;
  left: 0;
  top: -23px;
  width: 30px;
  height: 2px;
  background-color: var(--cyan);
  transition: width var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-home .home-step:hover .home-step__link::after {
  width: 100%;
  background-color: var(--violet);
}

.page-home .home-step__num {
  font-size: var(--fs-tiny);
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-home .home-step__name {
  font-family: var(--font-title);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-home .home-step__desc {
  font-size: var(--fs-aux);
  line-height: 1.78;
  color: var(--mist);
  opacity: .72;
  transition: opacity var(--dur) var(--ease);
}

.page-home .home-step__go {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: .06em;
  color: var(--cyan);
  transition: color var(--dur) var(--ease);
}

.page-home .home-step:hover .home-step__name,
.page-home .home-step__link:focus-visible .home-step__name {
  color: var(--cyan);
}

.page-home .home-step:hover .home-step__desc {
  opacity: 1;
}

.page-home .home-steps__figure {
  margin: 34px 0 0;
}

.page-home .home-steps__figure .figure__frame {
  aspect-ratio: 1200 / 560;
}

/* --- 本月版本 --- */
.page-home .home-release {
  padding: 56px 0 60px;
}

.page-home .home-release__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-home .home-release__figure {
  margin: 0;
}

.page-home .home-release__figure .figure__frame {
  aspect-ratio: 10 / 7.6;
}

.page-home .home-release__stamp {
  display: inline-block;
  margin: 14px 0 0;
  padding: 6px 12px;
  border: 1px solid var(--gold);
  background-color: rgba(232, 196, 106, .07);
  font-size: var(--fs-tiny);
  letter-spacing: .1em;
  color: var(--gold);
}

.page-home .home-release__body h2 {
  margin: 10px 0 14px;
  font-family: var(--font-title);
  font-size: clamp(24px, 4.4vw, var(--fs-md));
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-home .home-release__intro {
  margin: 0 0 26px;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--mist);
  max-width: 36em;
}

.page-home .home-release__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  border-top: var(--home-hair);
}

.page-home .home-release__item {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: var(--home-hair);
}

.page-home .home-release__idx {
  font-size: var(--fs-tiny);
  letter-spacing: .1em;
  color: var(--violet);
  padding-top: 4px;
}

.page-home .home-release__item-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-size: var(--fs-body);
  font-weight: 700;
  color: var(--paper);
}

.page-home .home-release__item-body p {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.75;
  color: var(--mist);
}

/* --- 资料库与历史版本 --- */
.page-home .home-archive {
  padding: 56px 0 60px;
  background-color: var(--nebula);
  border-top: var(--home-hair);
  border-bottom: var(--home-hair);
}

.page-home .home-archive__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-bottom: 30px;
}

.page-home .home-archive__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-title);
  font-size: clamp(24px, 4.4vw, var(--fs-md));
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-home .home-archive__intro {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.85;
  color: var(--mist);
  max-width: 40em;
}

.page-home .home-archive__figure {
  margin: 0 0 30px;
}

.page-home .home-archive__figure .figure__frame {
  aspect-ratio: 21 / 9;
}

.page-home .home-archive__months {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  background-color: var(--pine);
  border: var(--home-hair);
}

.page-home .home-month {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding: 14px;
  border-bottom: var(--home-hair);
  position: relative;
}

.page-home .home-month:last-child {
  border-bottom: 0;
}

.page-home .home-month:first-child::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 22px;
  margin-top: -11px;
  background-color: var(--gold);
}

.page-home .home-month__label {
  min-width: 80px;
  font-size: var(--fs-tiny);
  letter-spacing: .1em;
  color: var(--mist);
}

.page-home .home-month__ver {
  min-width: 76px;
  font-size: var(--fs-aux);
  color: var(--cyan);
}

.page-home .home-month__count {
  min-width: 112px;
  font-size: var(--fs-aux);
  color: var(--paper);
}

.page-home .home-month__focus {
  flex: 1 1 200px;
  font-size: var(--fs-tiny);
  line-height: 1.7;
  color: var(--mist-soft);
}

.page-home .home-archive__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* --- 品牌与联系条 --- */
.page-home .home-identity {
  padding: 56px 0 72px;
}

.page-home .home-identity__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-home .home-identity__body h2 {
  margin: 10px 0 18px;
  font-family: var(--font-title);
  font-size: clamp(24px, 4.4vw, var(--fs-md));
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-home .home-identity__body p {
  margin: 0 0 16px;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--mist);
  max-width: 36em;
}

.page-home .home-identity__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-home .home-identity__panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
}

.page-home .home-identity__panel-title {
  margin: 0;
  font-size: var(--fs-tiny);
  letter-spacing: .12em;
  color: var(--gold);
}

.page-home .home-identity__panel p {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.8;
  color: var(--mist);
}

/* --- 响应式 --- */
@media (min-width: 640px) {
  .page-home .home-archive__head {
    grid-template-columns: 5fr 7fr;
    gap: 36px;
    align-items: start;
  }

  .page-home .home-steps__list {
    grid-template-columns: 1.1fr 1fr 1.2fr;
    column-gap: 28px;
  }

  .page-home .home-step:nth-child(1) {
    border-top-color: var(--cyan);
  }
}

@media (min-width: 900px) {
  .page-home .home-cover {
    padding-top: 48px;
  }

  .page-home .home-cover__grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 0;
    align-items: start;
  }

  .page-home .home-rail {
    grid-column: 1 / span 4;
    padding: 0 34px 0 0;
    border-right: var(--home-hair);
    border-bottom: 0;
    min-height: 100%;
  }

  .page-home .home-cover__main {
    grid-column: 5 / span 8;
    padding-left: 44px;
  }

  .page-home .home-cover__figure {
    margin-top: 4px;
  }

  .page-home .home-steps {
    padding: 72px 0 78px;
  }

  .page-home .home-steps__grid {
    grid-template-columns: 3fr 9fr;
    gap: 0;
  }

  .page-home .home-steps__aside {
    padding-right: 34px;
    border-right: var(--home-hair);
  }

  .page-home .home-steps__main {
    padding-left: 44px;
  }

  .page-home .home-release {
    padding: 76px 0 82px;
  }

  .page-home .home-release__grid {
    grid-template-columns: 5fr 7fr;
    column-gap: 52px;
    align-items: start;
  }

  .page-home .home-archive {
    padding: 76px 0 82px;
  }

  .page-home .home-identity {
    padding: 76px 0 92px;
  }

  .page-home .home-identity__grid {
    grid-template-columns: 7fr 5fr;
    column-gap: 52px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .home-rail__paths a,
  .page-home .home-step__link::after,
  .page-home .home-badge > summary,
  .page-home .home-rail__back,
  .page-home .home-rail__back-node,
  .page-home .home-step__desc,
  .page-home .home-step__name,
  .page-home .home-cover__index {
    transition: none;
  }

  .page-home .home-rail__paths a:hover,
  .page-home .home-rail__paths a:focus-visible {
    transform: none;
  }
}