/* ============ 品牌档案页 · page-about ============ */

.page-about {
  --about-rail-w: 176px;
  --about-card-shadow: 7px 7px 0 -1px rgba(242, 193, 78, .34);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 86% at 12% -6%, rgba(224, 27, 36, .30), transparent 62%),
    linear-gradient(180deg, var(--rb-black) 0%, var(--rb-ink) 100%);
  color: var(--rb-paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(242, 193, 78, .075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 193, 78, .075) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -30%;
  width: 46vw;
  height: 46vw;
  max-width: 520px;
  max-height: 520px;
  border: 1px solid rgba(242, 193, 78, .22);
  border-radius: 50%;
  pointer-events: none;
}

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

.page-about .about-hero .rb-breadcrumb {
  margin-bottom: 34px;
  color: var(--rb-gray);
}

.page-about .about-hero .rb-breadcrumb a {
  color: var(--rb-gray);
}

.page-about .about-hero .rb-breadcrumb a:hover,
.page-about .about-hero .rb-breadcrumb [aria-current="page"] {
  color: var(--rb-gold);
}

.page-about .about-eyebrow-light {
  color: var(--rb-gold);
  font-family: var(--rb-font-mono);
  letter-spacing: .16em;
  font-size: 12px;
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 15em;
  font-weight: 900;
  font-size: clamp(32px, 7vw, 76px);
  line-height: 1.06;
  letter-spacing: -.03em;
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 46em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(255, 253, 249, .82);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 44px 0 0;
  padding: 0;
  background: rgba(242, 193, 78, .26);
  border: 1px solid rgba(242, 193, 78, .26);
}

.page-about .about-stat {
  background: rgba(11, 13, 16, .72);
  padding: 18px 16px 16px;
}

.page-about .about-stat dt {
  font-family: var(--rb-font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--rb-gray);
  text-transform: uppercase;
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  font-family: var(--rb-font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--rb-gold);
  letter-spacing: -.01em;
}

/* ---------- 通用小标题组 ---------- */
.page-about .about-section-head {
  max-width: 68ch;
}

.page-about .about-section-head .rb-section-title {
  margin: 12px 0 0;
}

.page-about .about-section-head .rb-section-note {
  margin: 16px 0 0;
}

.page-about .about-title-light {
  color: var(--rb-paper);
}

.page-about .about-section-note-light {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 253, 249, .74);
}

.page-about .about-eyebrow-gold {
  color: var(--rb-gold);
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  margin: 0;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  background: var(--rb-cream);
}

.page-about .about-timeline__figure {
  margin: 40px 0 0;
  border: 1px solid var(--rb-paper-2);
  background: var(--rb-black);
  position: relative;
  overflow: hidden;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 620;
  object-fit: cover;
}

.page-about .about-timeline__figure .rb-media__caption {
  position: static;
  padding: 12px 14px;
  background: var(--rb-ink);
  color: var(--rb-gray);
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .about-timeline__layout {
  display: grid;
  gap: 36px;
  margin-top: 52px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--rb-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--rb-gray);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 14px;
  border: 1px solid var(--rb-paper-2);
  background: var(--rb-paper);
  color: var(--rb-ink);
  text-decoration: none;
  font-size: 14px;
  transition: border-color .2s var(--rb-ease), color .2s var(--rb-ease), background-color .2s var(--rb-ease);
}

.page-about .about-rail__num {
  font-family: var(--rb-font-mono);
  font-size: 12px;
  color: var(--rb-bronze);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--rb-red);
  background: var(--rb-paper);
  color: var(--rb-red);
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link:focus-visible .about-rail__num {
  color: var(--rb-red);
}

.page-about .about-phases {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-phase {
  position: relative;
  margin-left: 8px;
  padding-left: 30px;
  padding-bottom: 46px;
  border-left: 2px solid rgba(201, 146, 47, .38);
}

.page-about .about-phase:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-phase__node {
  position: absolute;
  left: -9px;
  top: 10px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--rb-cream);
  border: 2px solid var(--rb-bronze);
}

.page-about .about-phase__card {
  margin-right: 8px;
  padding: 24px 22px 22px;
  background: var(--rb-paper);
  border: 1px solid var(--rb-paper-2);
  box-shadow: var(--about-card-shadow);
  transition: border-color .22s var(--rb-ease), transform .22s var(--rb-ease);
}

.page-about .about-phase__card:hover {
  border-color: var(--rb-bronze);
  transform: translateY(-3px);
}

.page-about .about-phase__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--rb-gray);
  text-transform: uppercase;
}

.page-about .about-phase__num {
  display: inline-block;
  padding: 3px 9px;
  background: var(--rb-red);
  color: var(--rb-paper);
  font-weight: 700;
  letter-spacing: .08em;
}

.page-about .about-phase__title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--rb-black);
}

.page-about .about-phase__text {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: #3b3f47;
}

.page-about .about-phase__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rb-line-ink);
}

.page-about .about-phase__list li {
  position: relative;
  padding: 9px 0 9px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: #4a4f57;
  border-bottom: 1px dashed rgba(11, 13, 16, .09);
}

.page-about .about-phase__list li:last-child {
  border-bottom: 0;
}

.page-about .about-phase__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 18px;
  width: 7px;
  height: 7px;
  background: var(--rb-gold);
}

/* ---------- 三条主线 ---------- */
.page-about .about-work {
  background: var(--rb-black);
  color: var(--rb-paper);
}

.page-about .about-work__list {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-work__item {
  position: relative;
  padding: 28px 22px 26px;
  background: var(--rb-ink);
  border: 1px solid var(--rb-line);
  border-top: 3px solid var(--rb-red);
}

.page-about .about-work__num {
  margin: 0;
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--rb-gold);
}

.page-about .about-work__title {
  margin: 14px 0 0;
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.015em;
  color: var(--rb-paper);
}

.page-about .about-work__text {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 253, 249, .74);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team {
  background: var(--rb-paper);
}

.page-about .about-team__grid {
  display: grid;
  gap: 18px;
  margin-top: 44px;
}

.page-about .about-team__card {
  position: relative;
  padding: 28px 22px 24px;
  background: var(--rb-paper);
  border: 1px solid var(--rb-paper-2);
  border-left: 3px solid var(--rb-bronze);
  transition: border-color .22s var(--rb-ease), transform .22s var(--rb-ease), box-shadow .22s var(--rb-ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  border-left-color: var(--rb-red);
  border-color: rgba(201, 146, 47, .7);
  transform: translateY(-4px);
  box-shadow: 0 16px 0 -9px rgba(242, 193, 78, .55);
}

.page-about .about-team__count {
  margin: 0;
  font-family: var(--rb-font-mono);
  font-size: clamp(36px, 6vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--rb-red);
  letter-spacing: -.03em;
}

.page-about .about-team__name {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--rb-black);
}

.page-about .about-team__role {
  margin: 8px 0 0;
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--rb-gray);
}

.page-about .about-team__duties {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rb-line-ink);
}

.page-about .about-team__duties li {
  position: relative;
  padding: 9px 0 9px 18px;
  font-size: 15px;
  line-height: 1.7;
  color: #4a4f57;
}

.page-about .about-team__duties li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--rb-bronze);
}

/* ---------- 版本档案库 ---------- */
.page-about .about-archive {
  background: var(--rb-cream);
}

.page-about .about-archive__figure {
  margin: 0 0 40px;
  border: 1px solid var(--rb-paper-2);
  background: var(--rb-black);
  overflow: hidden;
}

.page-about .about-archive__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 800;
  object-fit: cover;
}

.page-about .about-archive__tabs {
  margin-top: 36px;
}

.page-about .about-archive__tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--rb-line-ink);
  padding-bottom: 0;
}

.page-about .about-archive__tab.rb-tabs__tab {
  appearance: none;
  border: 1px solid var(--rb-paper-2);
  border-bottom: 0;
  background: var(--rb-paper);
  color: #4a4f57;
  font-family: var(--rb-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  padding: 11px 18px;
  cursor: pointer;
  transition: background-color .18s var(--rb-ease), color .18s var(--rb-ease), border-color .18s var(--rb-ease);
}

.page-about .about-archive__tab.rb-tabs__tab:hover {
  border-color: var(--rb-bronze);
  color: var(--rb-red);
}

.page-about .about-archive__tab.rb-tabs__tab[aria-selected="true"] {
  background: var(--rb-black);
  border-color: var(--rb-black);
  color: var(--rb-gold);
}

.page-about .about-archive__panels {
  padding-top: 26px;
}

.page-about .about-archive__panel-title {
  margin: 0 0 18px;
  font-family: var(--rb-font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--rb-bronze);
  text-transform: uppercase;
}

.page-about .about-archive__wall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
}

.page-about .about-archive__card {
  padding: 18px 16px 20px;
  background: var(--rb-paper);
  border: 1px solid var(--rb-paper-2);
  border-left: 3px solid var(--rb-bronze);
  transition: border-color .2s var(--rb-ease), transform .2s var(--rb-ease);
}

.page-about .about-archive__card:hover {
  border-left-color: var(--rb-red);
  transform: translateY(-3px);
}

.page-about .about-archive__card--current {
  border-left-color: var(--rb-red);
  background: linear-gradient(180deg, var(--rb-paper) 0%, rgba(242, 193, 78, .14) 100%);
}

.page-about .about-archive__ver {
  margin: 0;
  font-family: var(--rb-font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--rb-black);
}

.page-about .about-archive__card--current .about-archive__ver {
  color: var(--rb-red);
}

.page-about .about-archive__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: #565b63;
}

.page-about .about-archive__foot {
  margin: 34px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--rb-line-ink);
  font-size: 15px;
  line-height: 1.85;
  color: #4a4f57;
}

.page-about .about-archive__foot a {
  color: var(--rb-red);
  text-decoration: none;
  border-bottom: 1px solid rgba(224, 27, 36, .35);
}

.page-about .about-archive__foot a:hover {
  border-bottom-color: var(--rb-red);
}

/* ---------- 服务地域 ---------- */
.page-about .about-region {
  background: var(--rb-paper);
}

.page-about .about-region__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-region__lead {
  margin: 18px 0 0;
  font-size: 17px;
  line-height: 1.85;
  color: #3b3f47;
  max-width: 34em;
}

.page-about .about-region__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--rb-line-ink);
}

.page-about .about-region__list li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rb-line-ink);
}

.page-about .about-region__key {
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--rb-bronze);
  padding-top: 3px;
}

.page-about .about-region__val {
  font-size: 15px;
  line-height: 1.8;
  color: #3b3f47;
}

.page-about .about-region__cta {
  margin: 26px 0 0;
}

.page-about .about-region__figure {
  margin: 0;
  border: 1px solid var(--rb-paper-2);
  background: var(--rb-black);
  overflow: hidden;
}

.page-about .about-region__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 900;
  object-fit: cover;
}

.page-about .about-region__figure .rb-media__caption {
  padding: 12px 14px;
  background: var(--rb-ink);
  color: var(--rb-gray);
  font-family: var(--rb-font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

/* ---------- 长期协作 ---------- */
.page-about .about-partners {
  background: var(--rb-ink);
  color: var(--rb-paper);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-partners__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rb-line);
  border: 1px solid var(--rb-line);
}

.page-about .about-partners__fact {
  background: rgba(11, 13, 16, .68);
  padding: 22px 20px;
}

.page-about .about-partners__fact-num {
  margin: 0;
  font-family: var(--rb-font-mono);
  font-size: clamp(30px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--rb-gold);
  letter-spacing: -.03em;
}

.page-about .about-partners__fact-label {
  margin: 12px 0 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--rb-paper);
}

.page-about .about-partners__fact-note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--rb-gray);
}

.page-about .about-partners__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--rb-line);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-work__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-timeline__layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--rb-header-h) + 28px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .about-region__grid {
    grid-template-columns: 7fr 5fr;
    gap: 52px;
    align-items: center;
  }

  .page-about .about-partners__grid {
    grid-template-columns: 6fr 6fr;
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-phases {
    padding-right: 8px;
  }

  .page-about .about-phase__card {
    padding: 28px 28px 26px;
  }
}

/* 尊重减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase__card,
  .page-about .about-team__card,
  .page-about .about-archive__card,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-phase__card:hover,
  .page-about .about-team__card:hover,
  .page-about .about-archive__card:hover {
    transform: none;
  }
}