/* ================= 首页 · 框景首屏与版本对照 ================= */

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

.page-home .section {
  padding: 68px 0;
}

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

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

@media (min-width: 900px) {
  .page-home .section {
    padding: 104px 0;
  }
}

/* ---------- 首屏框景 ---------- */

.page-home .hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 84px 16px 56px;
  background: var(--ink);
}

.page-home .hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-home .hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-home .hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(120% 78% at 84% 10%, rgba(140, 29, 44, 0.36), transparent 62%),
    linear-gradient(180deg, rgba(16, 14, 13, 0.78) 0%, rgba(16, 14, 13, 0.9) 56%, var(--ink) 100%);
}

.page-home .hero__frame {
  position: relative;
  max-width: var(--wrap-wide);
  margin: 0 auto;
  border: 2px solid var(--line-gold);
  box-shadow: 0 30px 90px rgba(78, 15, 25, 0.45);
}

.page-home .hero__frame::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid var(--line-stone);
  pointer-events: none;
}

.page-home .hero__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, rgba(201, 162, 39, 0.28) 0 1.5px, transparent 1.7px);
  background-size: 30px 30px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 48%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 48%);
  opacity: 0.75;
}

.page-home .hero__body {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 38px;
  padding: 38px 20px 34px;
}

.page-home .kicker {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-home .hero__title {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(32px, 5.4vw, 62px);
  line-height: 1.17;
  letter-spacing: 0.02em;
  color: var(--porcelain);
}

.page-home .hero__title em {
  font-style: normal;
  color: var(--gold-light);
}

.page-home .hero__lead {
  margin: 0 0 30px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.86;
  color: rgba(245, 241, 234, 0.78);
}

.page-home .hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
}

.page-home .hero__rail {
  border-top: 1px solid var(--line-gold);
  padding-top: 20px;
}

.page-home .hero__rail-title {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-home .vstat {
  margin: 0 0 18px;
}

.page-home .vstat__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-stone);
}

.page-home .vstat__row dt {
  font-size: 13px;
  color: var(--stone);
}

.page-home .vstat__row dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-home .vstat__num {
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--porcelain);
}

.page-home .vstat__unit {
  font-size: 12px;
  color: var(--stone);
}

.page-home .hero__rail-note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-home .hero {
    padding: 118px 32px 86px;
  }
  .page-home .hero__body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    padding: 60px 52px 54px;
  }
  .page-home .hero__lead {
    font-size: 17px;
  }
  .page-home .hero__rail {
    border-top: 0;
    border-left: 1px solid var(--line-gold);
    padding: 4px 0 0 28px;
  }
}

/* ---------- 章节标题 ---------- */

.page-home .section-head {
  max-width: 72ch;
  margin-bottom: 40px;
}

.page-home .section-head__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-home .section-head__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.24;
  letter-spacing: 0.02em;
  color: var(--porcelain);
}

.page-home .section-head__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 234, 0.68);
}

/* ---------- 门开四栏 ---------- */

.page-home .gateways__grid {
  display: grid;
  gap: 32px;
}

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

.page-home .gateways__item {
  position: relative;
  padding: 20px 0 20px 28px;
  border-top: 1px solid var(--line-stone);
}

.page-home .gateways__item:last-child {
  border-bottom: 1px solid var(--line-stone);
}

.page-home .gateways__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 27px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--gold);
  background: rgba(201, 162, 39, 0.14);
}

.page-home .gateways__title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.32;
}

.page-home .gateways__title a {
  color: var(--porcelain);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}

.page-home .gateways__title a:hover,
.page-home .gateways__title a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}

.page-home .gateways__text {
  margin: 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(245, 241, 234, 0.66);
}

@media (min-width: 900px) {
  .page-home .gateways__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }
}

/* ---------- 版本状态面板 ---------- */

.page-home .vboard__switch {
  display: inline-flex;
  border: 1px solid var(--line-gold);
  margin-bottom: 26px;
}

.page-home .vboard__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--stone);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  padding: 11px 20px;
  cursor: pointer;
  transition: background 0.2s ease-out, color 0.2s ease-out;
}

.page-home .vboard__btn + .vboard__btn {
  border-left: 1px solid var(--line-gold);
}

.page-home .vboard__btn:hover {
  color: var(--gold-light);
}

.page-home .vboard__btn[aria-pressed="true"] {
  background: var(--red);
  color: var(--porcelain);
}

.page-home .vboard__btn[aria-pressed="true"]:hover {
  color: var(--porcelain);
}

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

.page-home .vboard__cells {
  display: grid;
  gap: 1px;
  background: var(--line-stone);
  border: 1px solid var(--line-stone);
}

.page-home .vboard__cell {
  background: var(--ink-2);
  padding: 24px 22px 26px;
}

.page-home .vboard__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-home .vboard__value {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 26px;
  line-height: 1.24;
  color: var(--porcelain);
}

.page-home .vboard__value.mono {
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.07em;
  color: var(--gold-light);
}

.page-home .vboard__value--sm {
  font-size: 19px;
  line-height: 1.4;
}

.page-home .vboard__meta {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(245, 241, 234, 0.6);
}

@media (min-width: 560px) {
  .page-home .vboard__cells {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-home .vboard__board {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 30px;
    align-items: start;
  }
}

/* ---------- 差异卡片 ---------- */

.page-home .diff__grid {
  display: grid;
  gap: 20px;
}

.page-home .diff__card {
  border-left: 2px solid var(--red);
  border-top: 1px solid var(--line-stone);
  border-right: 1px solid var(--line-stone);
  border-bottom: 1px solid var(--line-stone);
  background: var(--ink-2);
  padding: 22px 22px 24px;
}

.page-home .diff__card .card__label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--jade-light);
}

.page-home .diff__card .card__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 21px;
  color: var(--porcelain);
}

.page-home .diff__card .card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(245, 241, 234, 0.68);
}

.page-home .diff__more {
  margin: 32px 0 0;
}

@media (min-width: 780px) {
  .page-home .diff__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 30px;
    align-items: start;
  }
  .page-home .diff__card:nth-child(2),
  .page-home .diff__card:nth-child(4) {
    margin-top: 36px;
  }
  .page-home .diff__more {
    margin-top: 66px;
  }
}

/* ---------- 资料与清单 ---------- */

.page-home .files__inner {
  display: grid;
  gap: 34px;
}

.page-home .lead {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 234, 0.72);
}

.page-home .steps {
  list-style: none;
  margin: 30px 0 34px;
  padding: 0;
}

.page-home .steps__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line-stone);
}

.page-home .steps__item:last-child {
  border-bottom: 1px solid var(--line-stone);
}

.page-home .steps__no {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 4px;
}

.page-home .steps__title {
  margin: 0 0 5px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 16.5px;
  color: var(--porcelain);
}

.page-home .steps__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(245, 241, 234, 0.62);
}

@media (min-width: 940px) {
  .page-home .files__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }
}

/* ---------- 三条路线 ---------- */

.page-home .routes__grid {
  display: grid;
  gap: 20px;
}

.page-home .route {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 24px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line-stone);
  border-top: 2px solid var(--red);
  text-decoration: none;
  color: inherit;
  transition: background 0.22s ease-out, border-color 0.22s ease-out, transform 0.22s ease-out;
}

.page-home .route:hover,
.page-home .route:focus-visible {
  background: #221c18;
  border-top-color: var(--gold);
  transform: translateY(-4px);
}

.page-home .route__kicker {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-home .route__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.36;
  color: var(--porcelain);
}

.page-home .route__text {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(245, 241, 234, 0.66);
}

.page-home .route__go {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--jade-light);
}

@media (min-width: 880px) {
  .page-home .routes__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: end;
  }
  .page-home .route--a {
    min-height: 232px;
  }
  .page-home .route--b {
    min-height: 320px;
  }
  .page-home .route--c {
    min-height: 196px;
  }
}

/* ---------- 近况短栏 ---------- */

.page-home .brief {
  padding: 46px 0 42px;
  background: linear-gradient(96deg, var(--red-deep) 0%, var(--ink-2) 54%, var(--ink) 100%);
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

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

.page-home .brief__no {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-home .brief__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(245, 241, 234, 0.82);
}

.page-home .brief__more {
  margin: 32px 0 0;
  font-size: 13.5px;
}

.page-home .brief__more a {
  color: var(--jade-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 166, 149, 0.4);
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}

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

@media (min-width: 820px) {
  .page-home .brief__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-home .brief__item {
    padding: 0 30px;
    border-left: 1px solid rgba(201, 162, 39, 0.28);
  }
  .page-home .brief__item:first-child {
    padding-left: 0;
    border-left: 0;
  }
  .page-home .brief__item:last-child {
    padding-right: 0;
  }
}

/* ---------- 右侧刻度目录 ---------- */

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

.page-home .rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

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

.page-home .rail__item {
  position: relative;
}

.page-home .rail__link {
  position: relative;
  display: block;
  padding: 8px 0 8px 14px;
  font-size: 12.5px;
  color: var(--stone);
  text-decoration: none;
  border-left: 1px solid var(--line-stone);
  transition: color 0.2s ease-out, border-color 0.2s ease-out;
}

.page-home .rail__link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  bottom: 100%;
  width: 2px;
  background: var(--gold);
  transition: bottom 0.3s ease-out;
}

.page-home .rail__link:hover,
.page-home .rail__link:focus-visible {
  color: var(--porcelain);
}

.page-home .rail__link.is-current {
  color: var(--gold-light);
  border-left-color: var(--gold);
}

.page-home .rail__link.is-current::before {
  bottom: 0;
}

@media (min-width: 1440px) {
  .page-home .rail {
    display: block;
    position: fixed;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    width: 140px;
    z-index: 16;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-home .route,
  .page-home .rail__link::before,
  .page-home .vboard__btn {
    transition: none;
  }
  .page-home .route:hover,
  .page-home .route:focus-visible {
    transform: none;
  }
}