.page-about {
  --about-rule: rgba(167, 167, 173, .2);
  --about-rule-strong: rgba(167, 167, 173, .42);
  --about-red-soft: rgba(200, 16, 46, .14);
  background: var(--ink);
  color: var(--bone);
  overflow-x: hidden;
}

.page-about .rh-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
  font-size: 13px;
  color: var(--silver);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 56px) 0 clamp(40px, 7vw, 92px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -18%;
  width: min(820px, 108vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 66% 36%, rgba(200, 16, 46, .34), rgba(200, 16, 46, .07) 46%, transparent 68%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: .26em 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(42px, 11vw, 104px);
  line-height: .94;
  letter-spacing: -.02em;
  color: var(--bone);
}

.page-about .about-hero__title span {
  display: block;
  margin-top: .4em;
  max-width: 24ch;
  font-size: clamp(17px, 2.4vw, 26px);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--silver);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: rgba(245, 240, 230, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--charcoal);
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.06) saturate(.92);
}

/* ---------- 本页目录 ---------- */

.page-about .about-index {
  padding: clamp(12px, 2vw, 18px) 0;
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
  background: rgba(20, 20, 26, .62);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 2px;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(245, 240, 230, .7);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--curtain);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--curtain);
}

/* ---------- 通用分区 ---------- */

.page-about .about-section {
  position: relative;
  padding: clamp(52px, 8vw, 108px) 0;
  scroll-margin-top: calc(var(--header-space) + 16px);
}

.page-about .about-section--tail {
  padding-bottom: clamp(64px, 9vw, 128px);
}

.page-about .about-section__head {
  max-width: 64ch;
}

.page-about .about-section__title {
  margin: .32em 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 46px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--bone);
}

.page-about .about-section__lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(245, 240, 230, .76);
}

/* ---------- 品牌定位 ---------- */

.page-about .about-prose {
  max-width: 66ch;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
  font-size: clamp(16px, 1.8vw, 17.5px);
  line-height: 1.85;
  color: rgba(245, 240, 230, .8);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 4.5vw, 52px);
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-fact {
  background: var(--ink);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bone);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--silver);
}

/* ---------- 用色 ---------- */

.page-about .about-ratio {
  display: flex;
  height: 14px;
  margin-top: clamp(26px, 3.4vw, 42px);
  border: 1px solid var(--about-rule);
}

.page-about .about-ratio__seg {
  height: 100%;
}

.page-about .about-ratio__seg--black {
  flex: 5.5;
  background: linear-gradient(90deg, #0A0A0C, #14141A);
}

.page-about .about-ratio__seg--red {
  flex: 1;
  background: var(--curtain);
}

.page-about .about-ratio__seg--bridge {
  flex: 1.6;
  background: linear-gradient(90deg, var(--stone), var(--sand));
}

.page-about .about-filterbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .about-palette {
  margin-top: 18px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-swatch {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-swatch__chip {
  display: block;
  width: 44px;
  height: 44px;
  border: 1px solid var(--about-rule-strong);
}

.page-about .about-swatch--ink .about-swatch__chip {
  background: var(--ink);
}

.page-about .about-swatch--charcoal .about-swatch__chip {
  background: var(--charcoal);
}

.page-about .about-swatch--curtain .about-swatch__chip {
  background: var(--curtain);
  border-color: var(--curtain);
}

.page-about .about-swatch--ember .about-swatch__chip {
  background: var(--ember);
  border-color: var(--ember);
}

.page-about .about-swatch--clay .about-swatch__chip {
  background: var(--clay);
  border-color: var(--clay);
}

.page-about .about-swatch--stone .about-swatch__chip {
  background: var(--stone);
}

.page-about .about-swatch--moss .about-swatch__chip {
  background: var(--moss);
  border-color: var(--moss);
}

.page-about .about-swatch--bone .about-swatch__chip {
  background: var(--bone);
}

.page-about .about-swatch--silver .about-swatch__chip {
  background: var(--silver);
}

.page-about .about-swatch--sand .about-swatch__chip {
  background: var(--sand);
}

.page-about .about-swatch__text {
  min-width: 0;
}

.page-about .about-swatch__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--bone);
}

.page-about .about-swatch__hex {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--silver);
}

.page-about .about-swatch__desc {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 240, 230, .74);
}

/* ---------- 发展历程 ---------- */

.page-about .about-journey {
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
  margin-top: clamp(30px, 4.5vw, 52px);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(200, 16, 46, .9), rgba(200, 16, 46, .08));
}

.page-about .about-timeline__entry {
  position: relative;
  padding-bottom: 2px;
}

.page-about .about-timeline__entry::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--curtain);
  box-shadow: 0 0 0 4px rgba(200, 16, 46, .09);
}

.page-about .about-timeline .rh-fold__item {
  margin-bottom: 10px;
  border: 1px solid var(--about-rule);
  background: var(--charcoal);
}

.page-about .about-timeline .rh-fold__item[data-open] {
  border-color: var(--about-rule-strong);
}

.page-about .about-stage__num {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--curtain);
}

.page-about .about-stage__name {
  font-size: clamp(16px, 2.1vw, 18.5px);
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-timeline .rh-fold__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(245, 240, 230, .76);
}

.page-about .about-journey__media {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--charcoal);
  overflow: hidden;
}

.page-about .about-journey__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-journey__note {
  padding: 14px 18px 16px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--silver);
}

/* ---------- 分类体系 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: center;
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .about-split__media {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--charcoal);
  overflow: hidden;
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-split__body {
  min-width: 0;
}

.page-about .about-axes {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-axes li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-rule);
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 240, 230, .76);
}

.page-about .about-axes b {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--bone);
}

.page-about .about-split__tail {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 240, 230, .8);
}

.page-about .about-split__links {
  margin-top: clamp(18px, 2.6vw, 26px);
}

/* ---------- 维护与反馈 ---------- */

.page-about .about-updates {
  position: relative;
  padding: clamp(28px, 5vw, 64px);
  border: 1px solid var(--about-rule);
  background: linear-gradient(158deg, rgba(20, 20, 26, .92), rgba(10, 10, 12, .98));
  overflow: hidden;
}

.page-about .about-updates::after {
  content: "";
  position: absolute;
  right: -100px;
  bottom: -140px;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(200, 16, 46, .28), transparent 70%);
  pointer-events: none;
}

.page-about .about-updates__head {
  position: relative;
  max-width: 64ch;
}

.page-about .about-updates__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 3.2vw, 42px);
  margin-top: clamp(26px, 3.4vw, 44px);
}

.page-about .about-updates__item h3 {
  margin: 0 0 10px;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--bone);
}

.page-about .about-updates__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(245, 240, 230, .76);
}

.page-about .about-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px !important;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--silver);
}

.page-about .about-updates__contact {
  position: relative;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--about-rule);
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  max-width: 68ch;
  padding-left: clamp(16px, 2.6vw, 28px);
  border-left: 2px solid var(--curtain);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--bone);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 240, 230, .78);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-timeline {
    padding-left: 36px;
  }

  .page-about .about-timeline::before {
    left: 6px;
  }

  .page-about .about-timeline__entry::before {
    left: -36px;
    width: 11px;
    height: 11px;
  }

  .page-about .about-swatch {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 22px;
    align-items: center;
  }

  .page-about .about-swatch__chip {
    width: 52px;
    height: 52px;
  }
}

@media (min-width: 820px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .about-split--reverse .about-split__media {
    order: -1;
  }
}

@media (min-width: 960px) {
  .page-about .about-journey {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }
}

@media (max-width: 480px) {
  .page-about .about-axes li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .about-swatch {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .about-swatch__chip {
    width: 36px;
    height: 36px;
  }
}