.page-about {
  --about-max: 1180px;
  --about-pad: clamp(20px, 5vw, 56px);
  --about-space: clamp(64px, 9vw, 128px);
  padding-bottom: clamp(32px, 6vw, 64px);
  color: var(--ink);
}

.page-about .crumbs {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 56px) var(--about-pad) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed), border-color var(--speed);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .crumbs__sep {
  margin: 0 .5em;
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 88px) var(--about-pad) clamp(40px, 6vw, 72px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(44px, 8.4vw, 108px);
  font-weight: 800;
  line-height: .96;
  letter-spacing: -.025em;
  margin: clamp(14px, 2.5vw, 26px) 0 clamp(24px, 4vw, 40px);
  max-width: 13ch;
}

.page-about .about-hero__lead {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.9vw, 21px);
  line-height: 1.85;
  margin: 0 0 clamp(32px, 5vw, 56px);
  max-width: 33em;
  color: var(--ink);
  opacity: .9;
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: clamp(22px, 3vw, 32px) 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 3vw, 40px);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .about-hero__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 通用区块头 ---------- */

.page-about .about-head {
  max-width: var(--about-max);
  margin: 0 auto clamp(28px, 4vw, 44px);
  padding-inline: var(--about-pad);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.2vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.018em;
  margin: 14px 0 0;
  max-width: 20ch;
}

/* ---------- 首屏配图 ---------- */

.page-about .about-figure {
  max-width: var(--about-max);
  margin: 0 auto clamp(56px, 8vw, 112px);
  padding-inline: var(--about-pad);
}

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

/* ---------- 起点 ---------- */

.page-about .about-origin {
  max-width: var(--about-max);
  margin: 0 auto var(--about-space);
  padding-inline: var(--about-pad);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-origin__main p {
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.9;
  margin: 0 0 1.3em;
  max-width: 34em;
  color: var(--ink);
  opacity: .88;
}

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

.page-about .about-origin__aside {
  border-top: 1px solid var(--line);
  padding-top: clamp(18px, 3vw, 28px);
  align-self: start;
}

.page-about .about-aside__label {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.4vw, 64px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--orange);
  margin-bottom: 16px;
}

.page-about .about-aside__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 30em;
}

/* ---------- 三条主张 ---------- */

.page-about .about-claims {
  max-width: var(--about-max);
  margin: 0 auto var(--about-space);
  padding-inline: var(--about-pad);
}

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

.page-about .claim {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: clamp(16px, 3vw, 44px);
  padding: clamp(24px, 3.4vw, 42px) 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--speed);
}

.page-about .claim__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--muted);
  padding-top: .35em;
}

.page-about .claim__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  letter-spacing: -.012em;
  line-height: 1.1;
  margin: 0 0 12px;
  color: var(--ink);
}

.page-about .claim__body p {
  margin: 0;
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.9;
  color: var(--muted);
  max-width: 42em;
}

.page-about .about-claims__figure {
  margin: clamp(40px, 5vw, 64px) 0 0;
  max-width: 480px;
}

.page-about .about-claims__figure .media-caption {
  margin-top: 12px;
}

.page-about .media-caption {
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--muted);
}

/* ---------- 档案库 ---------- */

.page-about .about-archive {
  max-width: var(--about-max);
  margin: 0 auto var(--about-space);
  padding-inline: var(--about-pad);
}

.page-about .about-archive__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(28px, 4vw, 48px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-archive__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-self: start;
}

.page-about .about-archive__num {
  font-family: var(--font-mono);
  font-size: clamp(64px, 12vw, 136px);
  line-height: .88;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-archive__unit {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-archive__sub {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-archive__text p {
  margin: 0 0 1.3em;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.9;
  max-width: 36em;
  color: var(--ink);
  opacity: .88;
}

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

.page-about .about-archive__levels {
  list-style: none;
  margin: 0;
  padding: clamp(18px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-level {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink);
  padding: 7px 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  margin: 0 0 var(--about-space);
}

.page-about .about-team__intro {
  max-width: var(--about-max);
  margin: 0 auto clamp(28px, 4vw, 44px);
  padding-inline: var(--about-pad);
}

.page-about .about-team__lead {
  margin: clamp(16px, 2vw, 24px) 0 0;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  max-width: 32em;
  color: var(--ink);
  opacity: .88;
}

.page-about .about-team__band,
.page-about .about-partners__band {
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .about-team__band .band__track,
.page-about .about-partners__band .band__track {
  display: flex;
  align-items: stretch;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: max-content;
}

.page-about .band__item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  min-width: 190px;
  padding: clamp(22px, 3vw, 34px) clamp(22px, 3vw, 38px);
  border-left: 1px solid var(--line);
}

.page-about .band__item:first-child {
  border-left: 0;
}

.page-about .band__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted);
  max-width: 15em;
}

.page-about .band__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .band__value--cyan {
  color: var(--cyan);
}

.page-about .band__value--orange {
  color: var(--orange);
}

.page-about .band__unit {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-team__roles {
  max-width: var(--about-max);
  margin: clamp(32px, 4vw, 56px) auto 0;
  padding-inline: var(--about-pad);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

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

.page-about .about-team__details {
  border-top: 1px solid var(--line);
}

.page-about .role {
  border-bottom: 1px solid var(--line);
}

.page-about .role__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  cursor: pointer;
  list-style: none;
  transition: color var(--speed);
}

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

.page-about .role__summary::marker {
  content: "";
}

.page-about .role__summary:hover,
.page-about .role__summary:focus-visible {
  color: var(--cyan);
}

.page-about .role__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 27px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.2;
}

.page-about .role__count {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2vw, 24px);
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .role[open] .role__count {
  color: var(--orange);
}

.page-about .role__body {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-size: 14.5px;
  line-height: 1.9;
  max-width: 40em;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  max-width: var(--about-max);
  margin: 0 auto var(--about-space);
  padding-inline: var(--about-pad);
}

.page-about .about-log {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 32px;
}

.page-about .about-log::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line);
}

.page-about .about-log__item {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px);
}

.page-about .about-log__item:last-child {
  padding-bottom: 0;
}

.page-about .about-log__mark {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--line);
  background: var(--bg);
  transition: background var(--speed), border-color var(--speed);
}

.page-about .about-log__item:hover .about-log__mark,
.page-about .about-log__item:focus-within .about-log__mark {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-log__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-log__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 26px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.25;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-log__body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  max-width: 40em;
  color: var(--muted);
}

/* ---------- 合作 ---------- */

.page-about .about-partners {
  max-width: var(--about-max);
  margin: 0 auto;
  padding-inline: var(--about-pad);
}

.page-about .about-partners__lead {
  margin: 0 0 clamp(28px, 4vw, 44px);
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  max-width: 34em;
  color: var(--ink);
  opacity: .88;
}

.page-about .about-partners__band {
  margin-inline: calc(-1 * var(--about-pad));
}

.page-about .about-partners__note {
  padding: clamp(26px, 3.4vw, 40px) 0 0;
}

.page-about .about-partners__note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  max-width: 42em;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(36px, 5vw, 60px);
  padding-top: clamp(26px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .about-cta__text {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .claim:nth-child(2) {
    padding-left: clamp(0px, 2vw, 26px);
  }

  .page-about .claim:nth-child(3) {
    padding-left: clamp(0px, 4vw, 52px);
  }

  .page-about .about-archive__body {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.6fr);
    align-items: start;
  }

  .page-about .about-team__roles {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-origin__aside {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: clamp(22px, 3vw, 36px);
  }

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (max-width: 519px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 22px;
  }

  .page-about .claim {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .claim__index {
    padding-top: 0;
  }

  .page-about .about-claims__figure {
    max-width: 100%;
  }

  .page-about .about-level {
    clip-path: none;
  }

  .page-about .band__item {
    min-width: 160px;
    padding: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .claim,
  .page-about .about-log__mark,
  .page-about .crumbs a,
  .page-about .role__summary {
    transition: none;
  }
}