/* ===== 品牌愿景 /mission/ ===== */
.page-about {
  --about-rail: 76px;
  --about-gap: 44px;
  --about-ink-soft: rgba(23, 22, 20, .74);
  --about-line: rgba(201, 192, 174, .6);
  --about-line-dark: rgba(201, 192, 174, .28);
}

.page-about .about-chapter,
.page-about .about-reach {
  scroll-margin-top: 92px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 56px;
  color: var(--paper);
  background:
    radial-gradient(120% 150% at 88% -10%, rgba(216, 167, 63, .20) 0%, rgba(27, 26, 23, 0) 56%),
    radial-gradient(95% 125% at 0% 110%, rgba(47, 126, 158, .18) 0%, rgba(27, 26, 23, 0) 62%),
    var(--rock);
  border-bottom: 3px solid var(--gold);
  overflow: hidden;
}

.page-about .about-hero .breadcrumbs {
  color: var(--cyan-soft);
  font-size: 13px;
}

.page-about .about-hero .breadcrumbs a {
  color: var(--gold-lit);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.page-about .about-hero__rail {
  display: none;
  margin: 0;
}

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

.page-about .about-hero__copy .display {
  margin: 0 0 18px;
}

.page-about .about-hero__copy .lead {
  max-width: 34em;
  color: rgba(245, 239, 227, .88);
  margin: 0 0 4px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-facts__item {
  margin: 0;
}

.page-about .about-facts dt {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan-soft);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--gold-lit);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-chapter__rail {
  display: none;
  margin: 0;
}

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

.page-about .about-chapter__body > p,
.page-about .about-split__text p {
  max-width: 34em;
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.85;
}

.page-about .about-chapter__body > p:last-child,
.page-about .about-split__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 章节题头 ---------- */
.page-about .about-head {
  margin: 0 0 22px;
}

.page-about .about-head__eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold-ink);
}

.page-about .about-head__title {
  margin: 0;
  padding-left: 14px;
  font-size: clamp(24px, 4.2vw, 32px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  border-left: 3px solid var(--gold);
}

.page-about .about-head--cyan .about-head__eyebrow {
  color: var(--cyan-deep);
}

.page-about .about-head--cyan .about-head__title {
  border-left-color: var(--cyan);
}

.page-about .about-head--dark .about-head__eyebrow {
  color: var(--cyan-soft);
}

.page-about .about-head--dark .about-head__title {
  color: var(--paper);
}

/* ---------- 图文错位双栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

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

.page-about .about-split__media {
  margin: 0;
}

/* ---------- 年份刻度折线 ---------- */
.page-about .era-chart {
  margin: 40px 0 -4px;
  padding: 0 8%;
}

.page-about .era-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .era-track {
  list-style: none;
  margin: 0;
  padding: 0 8%;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.page-about .era-node {
  padding: 4px 2px 6px;
  text-align: center;
  outline-offset: 4px;
}

.page-about .era-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--gold-ink);
}

.page-about .era-node__label {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .era-node__note {
  display: block;
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--about-ink-soft);
  transition: max-height .3s var(--ease), opacity .24s var(--ease), margin-top .3s var(--ease);
}

.page-about .era-node:hover .era-node__note,
.page-about .era-node:focus .era-node__note,
.page-about .era-node:focus-within .era-node__note {
  max-height: 170px;
  margin-top: 9px;
  opacity: 1;
}

/* ---------- 深色团队区块 ---------- */
.page-about .about-chapter--rock {
  background: var(--rock);
  color: var(--paper);
  border-top: 3px solid var(--gold);
  border-bottom: 3px solid var(--gold);
}

.page-about .about-chapter--rock > .shell {
  padding-top: 4px;
}

.page-about .about-chapter--rock .lead,
.page-about .about-chapter--rock .about-chapter__body > p {
  color: rgba(245, 239, 227, .86);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 30px 0 0;
}

.page-about .about-team__card {
  background: var(--rock-soft);
  border: 2px solid var(--stone);
  box-shadow: var(--shadow-hard-deep);
}

.page-about .about-team__card summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 18px 16px;
  list-style: none;
  cursor: pointer;
  border-left: 6px solid var(--gold);
}

.page-about .about-team__card summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__card summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold-lit);
}

.page-about .about-team__card[open] summary::after {
  content: "−";
}

.page-about .about-team__card summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-team__label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan-soft);
}

.page-about .about-team__name {
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__body {
  max-width: 34em;
  margin: 0;
  padding: 0 20px 20px 24px;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(245, 239, 227, .82);
}

/* ---------- 赛季阶段 ---------- */
.page-about .phase-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .phase-item {
  padding: 18px 16px 18px 18px;
  background: var(--paper-soft);
  border: 2px solid var(--stone);
  border-left: 4px solid var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .phase-item__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan-deep);
}

.page-about .phase-item__name {
  margin: 8px 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .phase-item__desc {
  max-width: 30em;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-season__media {
  margin: 32px 0 0;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 28px 0 24px;
  padding: 0;
  border-top: 2px solid var(--stone);
}

.page-about .partner-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 2px;
  border-bottom: 2px solid var(--stone);
}

.page-about .partner-list__num {
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: .02em;
  color: var(--felt);
}

.page-about .partner-list h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .partner-list p {
  max-width: 34em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-reach {
  position: relative;
  padding: 56px 0 60px;
  color: var(--paper);
  background:
    radial-gradient(110% 130% at 8% 0%, rgba(47, 126, 158, .22) 0%, rgba(27, 26, 23, 0) 60%),
    var(--rock);
  border-top: 3px solid var(--gold);
  overflow: hidden;
}

.page-about .about-reach::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--vermilion) 45%, var(--cyan) 100%);
}

.page-about .about-reach__title {
  margin: 0 0 16px;
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-reach__lead {
  max-width: 34em;
  margin: 0 0 30px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(245, 239, 227, .86);
}

.page-about .about-reach__links {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-reach__links a {
  display: block;
  padding: 18px 18px 16px;
  color: var(--paper);
  text-decoration: none;
  border: 2px solid rgba(201, 192, 174, .45);
  transition: border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-reach__links a:hover,
.page-about .about-reach__links a:focus-visible {
  border-color: var(--gold);
  background: rgba(216, 167, 63, .1);
  transform: translateY(-2px);
}

.page-about .about-reach__links a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-reach__links strong {
  display: block;
  margin-bottom: 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--gold-lit);
}

.page-about .about-reach__links span {
  font-size: 14px;
  line-height: 1.72;
  color: var(--cyan-soft);
}

.page-about .about-reach__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  padding-top: 26px;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-reach__cta p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 239, 227, .8);
}

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

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .phase-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .partner-list li {
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 26px;
    align-items: baseline;
  }

  .page-about .partner-list li > .partner-list__num {
    grid-row: 1 / span 2;
  }

  .page-about .partner-list li > h3,
  .page-about .partner-list li > p {
    grid-column: 2;
  }
}

@media (min-width: 800px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 24px 0 68px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    margin-top: 30px;
  }

  .page-about .about-hero__rail {
    display: block;
    padding: 6px 0 0 10px;
    border-left: 1px solid var(--about-line-dark);
  }

  .page-about .about-hero__rail span {
    display: block;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .24em;
    white-space: nowrap;
    color: var(--cyan-soft);
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-chapter__rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 12px;
  }

  .page-about .about-chapter__rail span {
    display: block;
    padding-left: 9px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .22em;
    white-space: nowrap;
    color: var(--moss);
    border-left: 3px solid var(--cyan);
  }

  .page-about .section--rock .about-chapter__rail span,
  .page-about .about-chapter--rock .about-chapter__rail span {
    color: var(--cyan-soft);
  }

  .page-about .phase-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 719px) {
  .page-about .era-chart {
    display: none;
  }

  .page-about .era-track {
    padding: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 10px;
    margin-top: 26px;
  }

  .page-about .era-node__note {
    max-height: none;
    margin-top: 8px;
    opacity: 1;
    text-align: left;
  }

  .page-about .era-node {
    text-align: left;
    padding-left: 10px;
    border-left: 3px solid var(--gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era-node__note,
  .page-about .about-reach__links a,
  .page-about .about-team__card summary {
    transition-duration: .01ms;
  }

  .page-about .about-reach__links a:hover,
  .page-about .about-reach__links a:focus-visible {
    transform: none;
  }
}
<<<END>>>