.page-about {
  --about-rail-w: 168px;
  background: var(--paper);
  color: var(--ink);
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(34px, 5vw, 64px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  top: -16%;
  right: -24%;
  width: 66%;
  height: 84%;
  background: var(--sun);
  opacity: .16;
  clip-path: polygon(26% 0, 100% 0, 100% 84%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__lead .breadcrumbs {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.14;
  letter-spacing: .02em;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 15em;
}

.page-about .about-hero__desc {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ink);
  margin: 0;
  max-width: 40em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(23, 21, 18, .22);
  border: var(--rule) solid var(--ink);
}

.page-about .about-hero__facts li {
  background: var(--paper);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .about-hero__fact-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.1;
  color: var(--lake);
  letter-spacing: .01em;
}

.page-about .about-hero__fact-label {
  font-family: var(--font-sans);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--slate);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  background: var(--white);
  border: var(--rule) solid var(--ink);
  padding: 9px;
  box-shadow: var(--plate-shadow);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  right: 9px;
  bottom: 44px;
  width: 46px;
  height: 46px;
  background: var(--sun);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border: 1px solid rgba(23, 21, 18, .35);
}

.page-about .about-hero__figure figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--slate);
  padding: 9px 2px 2px;
}

/* ---------- 章节骨架：左窄右宽 ---------- */

.page-about .about-block {
  display: grid;
  gap: clamp(14px, 2.6vw, 32px);
  padding-block: clamp(34px, 5vw, 64px);
  border-top: var(--rule) solid rgba(23, 21, 18, .2);
}

.page-about .about-block:first-of-type {
  border-top: var(--rule) solid var(--ink);
}

.page-about .about-rail__num {
  display: block;
  width: 62px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--sun);
  padding-bottom: 7px;
  border-bottom: var(--rule) solid var(--ink);
}

.page-about .about-rail__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--slate);
}

.page-about .about-block__body > .section-title {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.6vw, 38px);
  line-height: 1.25;
  letter-spacing: .02em;
  max-width: 18em;
}

.page-about .about-lead {
  margin: 0 0 clamp(22px, 3.2vw, 34px);
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--lake);
  max-width: 44em;
}

/* ---------- 01 四类内容 ---------- */

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

.page-about .about-work__item {
  position: relative;
  padding: 18px 0 20px 18px;
  border-top: 1px solid rgba(23, 21, 18, .2);
}

.page-about .about-work__item:last-child {
  border-bottom: 1px solid rgba(23, 21, 18, .2);
}

.page-about .about-work__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 24px;
  width: 3px;
  background: var(--sun);
}

.page-about .about-work__tag {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--copper);
}

.page-about .about-work__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.45;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-work__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(23, 21, 18, .82);
  max-width: 46em;
}

/* ---------- 02 时间线 ---------- */

.page-about .about-band {
  margin: 0 0 clamp(22px, 3vw, 32px);
  background: var(--white);
  border: var(--rule) solid var(--ink);
  padding: 8px;
  box-shadow: var(--plate-shadow);
}

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

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--sun) 0%, var(--lake-mid) 52%, rgba(31, 111, 107, .2) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 28px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--sun);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .about-timeline__item--current::before {
  background: var(--sun);
}

.page-about .about-timeline__date {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--copper);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(23, 21, 18, .8);
  max-width: 44em;
}

/* ---------- 03 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-team__figure {
  margin: 0;
  background: var(--white);
  border: var(--rule) solid var(--ink);
  padding: 8px;
  box-shadow: var(--plate-shadow);
}

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

.page-about .about-team__figure figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--slate);
  padding: 8px 2px 2px;
}

.page-about .about-team__cards {
  display: grid;
  gap: 12px;
}

.page-about .team-card {
  background: var(--white);
  border: var(--rule) solid var(--ink);
  border-left: 6px solid var(--lake-mid);
  padding: 16px 18px;
  box-shadow: var(--plate-shadow);
  transition: transform .22s var(--ease), border-left-color .22s var(--ease);
}

.page-about .team-card__title {
  margin: 0 0 4px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 16.5px;
  letter-spacing: .03em;
  color: var(--ink);
}

.page-about .team-card__role {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .team-card__more {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(23, 21, 18, .82);
}

/* ---------- 04 规模 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(23, 21, 18, .22);
  border: var(--rule) solid var(--ink);
}

.page-about .about-metrics__item {
  background: var(--white);
  padding: clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-metrics__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.1;
  color: var(--sun);
  letter-spacing: .01em;
}

.page-about .about-metrics__unit {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--lake);
}

.page-about .about-metrics__note {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 05 工作方法 ---------- */

.page-about .about-methods {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-methods__item {
  background: var(--white);
  border: var(--rule) solid var(--ink);
  border-left: 6px solid var(--sun);
  padding: 18px 20px;
  box-shadow: var(--plate-shadow);
}

.page-about .about-methods__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .03em;
  color: var(--ink);
}

.page-about .about-methods__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(23, 21, 18, .82);
}

/* ---------- 06 合作 ---------- */

.page-about .about-outro {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  background: var(--sand);
  border: var(--rule) solid var(--ink);
  padding: clamp(20px, 3.4vw, 40px);
  position: relative;
  overflow: hidden;
}

.page-about .about-outro::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 96px;
  height: 96px;
  background: var(--lake);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .about-outro__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.4vw, 24px);
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(23, 21, 18, .28);
}

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

.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--copper);
}

.page-about .about-steps__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(23, 21, 18, .85);
}

.page-about .about-outro__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(23, 21, 18, .85);
}

.page-about .about-contact-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-contact-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--slate);
  min-width: 3.5em;
}

.page-about .about-contact-list a {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid var(--copper);
  word-break: break-all;
}

.page-about .about-contact-list a:hover,
.page-about .about-contact-list a:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 交互与响应式 ---------- */

@media (hover: hover) and (min-width: 900px) {
  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: translateX(6px);
    border-left-color: var(--sun);
  }
}

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-methods {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: start;
    gap: clamp(34px, 4.5vw, 60px);
  }

  .page-about .about-hero__figure {
    transform: translateY(16px) rotate(-1.1deg);
  }

  .page-about .about-block {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(22px, 3.4vw, 52px);
  }

  .page-about .about-block__rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: start;
  }

  .page-about .about-work {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3.4vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}