.page-about {
  --about-line: rgba(201, 205, 210, 0.62);
  --about-hair: rgba(201, 205, 210, 0.4);
  --about-ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  background: var(--paper);
  color: var(--graphite);
  padding-bottom: 8px;
}

/* ---------- 布局骨架：移动端单列，索引横向滚动 ---------- */
.about-layout {
  display: block;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.about-index {
  position: sticky;
  top: 0;
  z-index: 5;
  margin: 0 calc(var(--gutter) * -1);
  padding: 10px var(--gutter) 8px;
  background: linear-gradient(to bottom, var(--paper) 72%, rgba(245, 241, 232, 0));
  border-bottom: 1px solid var(--about-hair);
}

.about-index__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: uppercase;
}

.about-index__list {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 4px 0;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--about-ease), border-color 0.18s var(--about-ease);
}

.about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.about-index__link:hover,
.about-index__link:focus-visible,
.about-index__link.is-current {
  color: var(--eagle-red);
  border-bottom-color: var(--gold);
}

.about-index__link.is-current .about-index__num {
  color: var(--eagle-red);
}

.about-canvas {
  min-width: 0;
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding: clamp(36px, 7vw, 76px) 0 clamp(40px, 8vw, 92px);
}

.about-hero__crumbs {
  margin-bottom: clamp(22px, 4vw, 40px);
  font-size: 13px;
  color: var(--ink-soft);
}

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

.about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--eagle-red);
}

.about-hero__title {
  margin: 0 0 26px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(38px, 9vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: var(--graphite);
  max-width: 15em;
}

.about-hero__lede {
  margin: 0;
  max-width: 38ch;
  font-size: clamp(16px, 2.4vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.about-hero__note {
  display: inline-block;
  margin: 22px 0 0;
  color: var(--gold);
}

.about-hero__frame {
  position: relative;
  overflow: hidden;
  border-radius: 10px 44px 10px 48px;
  background: var(--eagle-red-deep);
}

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

.about-hero__frame::after {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: -2%;
  height: 34%;
  background: linear-gradient(to top, rgba(92, 15, 22, 0.68), rgba(92, 15, 22, 0));
  clip-path: polygon(0 46%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.about-hero__media {
  margin: 0;
}

.about-hero__media .media__caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 章节通用 ---------- */
.about-section {
  padding: clamp(48px, 8vw, 104px) 0 clamp(44px, 7vw, 88px);
}

.about-section + .about-section {
  border-top: 1px solid var(--about-hair);
}

.about-section__head {
  position: relative;
  padding-left: 20px;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.about-section__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: linear-gradient(to bottom, var(--eagle-red), var(--gold));
  transform: skewY(-7deg);
  border-radius: 2px;
}

.about-section__index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.about-section__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--graphite);
}

.about-section__aside {
  display: block;
  margin: 14px 0 0;
  color: var(--ink-soft);
}

.about-section__body {
  min-width: 0;
}

.about-section__body + .about-section__body {
  margin-top: clamp(30px, 5vw, 52px);
}

.about-section__body .prose {
  max-width: 42ch;
}

.about-section__body .prose p {
  margin: 0 0 1.15em;
  font-size: clamp(16px, 2.2vw, 17px);
  line-height: 1.9;
  color: var(--ink-soft);
}

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

.about-subhead {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 3vw, 23px);
  letter-spacing: -0.02em;
  color: var(--graphite);
}

/* ---------- 时间线 ---------- */
.about-timeline {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-timeline__item {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--paper-warm);
  border-radius: 30px 8px 34px 8px;
}

.about-timeline__item--b {
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: 8px 32px 8px 36px;
}

.about-timeline__item--c {
  background: linear-gradient(150deg, rgba(185, 137, 58, 0.16), rgba(245, 241, 232, 0.9) 62%);
  border-radius: 34px 10px 30px 10px;
}

.about-timeline__num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--eagle-red);
}

.about-timeline__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--graphite);
}

.about-timeline__text {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.about-timeline__out {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ---------- 通用图块 ---------- */
.about-figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
}

.about-figure .media__frame {
  overflow: hidden;
  border-radius: 6px 40px 6px 40px;
  background: var(--eagle-red-deep);
}

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

.about-figure .media__caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 体量数据 ---------- */
.about-scale {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--about-line);
}

.about-scale__cell {
  padding: 26px 0 24px;
  border-bottom: 1px solid var(--about-line);
}

.about-scale__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 10vw, 66px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--eagle-red);
}

.about-scale__unit {
  margin-left: 6px;
  font-size: 0.36em;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.about-scale__label {
  display: block;
  margin-top: 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.01em;
  color: var(--graphite);
}

.about-scale__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 30ch;
}

/* ---------- 团队 ---------- */
.about-teams-wrap {
  display: grid;
  gap: 26px;
}

.about-teams-media {
  margin: 0;
}

.about-teams-media .media__frame {
  overflow: hidden;
  border-radius: 8px 36px 8px 36px;
  background: var(--graphite);
}

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

.about-teams {
  display: grid;
  gap: 16px;
}

.about-team {
  padding: 24px 22px 26px;
  background: var(--paper-warm);
  border-radius: 28px 28px 28px 6px;
  transition: transform 0.24s var(--about-ease), background-color 0.24s var(--about-ease);
}

.about-team--b {
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-radius: 6px 30px 6px 30px;
}

.about-team--c {
  background: var(--eagle-red-deep);
  border-radius: 30px 6px 30px 6px;
}

.about-team--d {
  background: linear-gradient(200deg, var(--state-blue-soft), var(--paper-warm) 76%);
  border-radius: 6px 26px 34px 6px;
}

.about-team__name {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.015em;
  color: var(--graphite);
}

.about-team--c .about-team__name {
  color: var(--paper);
}

.about-team__duty {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.about-team--c .about-team__duty {
  color: rgba(245, 241, 232, 0.86);
}

.about-team__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  opacity: 0.5;
  transition: opacity 0.24s var(--about-ease);
}

.about-team:hover .about-team__keys,
.about-team:focus-within .about-team__keys {
  opacity: 1;
}

.about-team__keys li {
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--eagle-red);
  background: rgba(142, 27, 34, 0.09);
  border-radius: 999px;
}

.about-team--c .about-team__keys li {
  color: var(--gold-bright);
  background: rgba(227, 182, 92, 0.16);
}

.about-team--d .about-team__keys li {
  color: var(--state-blue);
  background: rgba(46, 143, 166, 0.12);
}

/* ---------- 台账清单 ---------- */
.about-ledger {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.about-ledger__row {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.about-ledger__key {
  font-size: 15px;
  letter-spacing: 0.05em;
  color: var(--eagle-red);
}

.about-ledger__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 生态 ---------- */
.about-eco {
  display: grid;
  gap: 34px;
}

.about-eco__big {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(72px, 18vw, 132px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--eagle-red);
}

.about-eco__plus {
  font-size: 0.4em;
  color: var(--gold);
  vertical-align: super;
}

.about-eco__caption {
  margin: 18px 0 0;
  max-width: 34ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.about-eco__list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.about-eco__item {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-line);
}

.about-eco__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--graphite);
}

.about-eco__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.about-eco__seal {
  padding: 26px 24px 28px;
  background: var(--eagle-red-deep);
  border-radius: 8px 34px 8px 34px;
}

.about-eco__seal-title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--gold-bright);
}

.about-eco__seal-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.86);
  max-width: 44ch;
}

/* ---------- 视觉意象 ---------- */
.about-visual {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.about-visual__item {
  padding: 22px 0;
  border-bottom: 1px solid var(--about-line);
}

.about-visual__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.015em;
  color: var(--graphite);
}

.about-visual__name::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 3px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--gold);
  transform: skewX(-24deg);
}

.about-visual__desc {
  margin: 0;
  padding-left: 26px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 结尾 ---------- */
.about-close {
  margin-top: clamp(48px, 8vw, 104px);
  padding: clamp(34px, 6vw, 60px) clamp(24px, 4vw, 52px);
  background: linear-gradient(122deg, var(--eagle-red-deep), var(--eagle-red) 58%, var(--eagle-red-deep));
  border-radius: 10px 48px 10px 48px;
}

.about-close__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.about-close__text {
  margin: 0 0 28px;
  max-width: 48ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(245, 241, 232, 0.88);
}

.about-close__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.about-close__link {
  font-size: 14px;
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(227, 182, 92, 0.5);
  padding-bottom: 3px;
  transition: border-color 0.18s var(--about-ease), color 0.18s var(--about-ease);
}

.about-close__link:hover,
.about-close__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .about-scale {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 40px;
  }

  .about-scale__cell:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .about-teams {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-ledger__row {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }

  .about-eco__list {
    grid-template-columns: repeat(3, 1fr);
    column-gap: 28px;
  }

  .about-eco__item {
    border-bottom: 0;
    padding-bottom: 8px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .about-layout {
    display: grid;
    grid-template-columns: 188px minmax(0, 1fr);
    column-gap: clamp(30px, 4vw, 64px);
    align-items: start;
  }

  .about-index {
    position: sticky;
    top: 132px;
    margin: 0;
    padding: 52px 0 0;
    background: transparent;
    border-bottom: 0;
  }

  .about-index__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .about-index__list li + li {
    margin-top: 4px;
  }

  .about-index__link {
    display: flex;
    justify-content: flex-start;
    padding: 6px 0 6px 2px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding-left: 10px;
    transition: border-color 0.18s var(--about-ease), color 0.18s var(--about-ease),
      padding-left 0.18s var(--about-ease);
  }

  .about-index__link:hover,
  .about-index__link:focus-visible,
  .about-index__link.is-current {
    border-left-color: var(--gold);
    padding-left: 16px;
    color: var(--eagle-red);
  }

  .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: end;
  }

  .about-hero__media {
    transform: translateY(14px);
  }

  .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
    align-items: start;
  }

  .about-timeline__item--b {
    transform: translateY(40px);
  }

  .about-timeline__item--c {
    transform: translateY(80px);
  }

  .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 32px;
  }

  .about-scale__cell {
    border-bottom: 0;
    padding-bottom: 8px;
  }

  .about-scale__cell:first-child {
    padding-right: 18px;
  }

  .about-teams-wrap {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .about-teams {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    align-items: start;
  }

  .about-team {
    padding: 22px 18px 24px;
  }

  .about-team--b {
    margin-top: 34px;
  }

  .about-team--c {
    margin-top: 12px;
  }

  .about-team--d {
    margin-top: 52px;
  }

  .about-eco {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .about-eco__seal {
    grid-column: 1 / -1;
  }

  .about-visual {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 64px);
  }
}

/* ---------- 大屏 ---------- */
@media (min-width: 1280px) {
  .about-index {
    grid-column: 1;
  }

  .about-hero__media {
    transform: translateY(22px);
  }
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-index__link,
  .page-about .about-close__link,
  .page-about .about-team__keys {
    transition: none;
  }

  .page-about .about-timeline__item--b,
  .page-about .about-timeline__item--c,
  .page-about .about-hero__media,
  .page-about .about-team--b,
  .page-about .about-team--c,
  .page-about .about-team--d {
    transform: none;
  }
}