.page-about {
  --about-col-gap: clamp(20px, 3vw, 44px);
  background: var(--cream);
  color: var(--char);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-h2 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-stretch: 82%;
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.06;
  font-size: clamp(24px, 4.6vw, 40px);
  color: var(--ink-green);
}

.page-about .about-lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: #3b3229;
}

.page-about .about-lead--light {
  color: rgba(243, 235, 220, .82);
}

/* 首屏封面 */
.page-about .about-hero {
  padding: calc(var(--header-h) + 44px) 0 0;
  background-color: var(--ink-green);
  background-image:
    linear-gradient(rgba(192, 135, 75, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(192, 135, 75, .14) 1px, transparent 1px);
  background-size: 92px 92px;
  color: var(--cream);
  border-bottom: var(--line-copper-strong);
}

.page-about .breadcrumb {
  margin-bottom: 6px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(243, 235, 220, .64);
}

.page-about .breadcrumb__list a {
  color: var(--copper-hi);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb__list a:hover {
  border-bottom-color: var(--copper-hi);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(192, 135, 75, .7);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 24px;
}

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

.page-about .about-hero .eyebrow {
  color: var(--copper-hi);
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-stretch: 82%;
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: .98;
  font-size: clamp(34px, 8.4vw, 76px);
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(243, 235, 220, .84);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 26px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: var(--line-copper-soft);
}

.page-about .about-hero__meta .mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--copper-hi);
}

/* 图片容器 */
.page-about .media {
  margin: 0;
  border: 1px solid rgba(192, 135, 75, .5);
  background: var(--ink-deep);
}

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

.page-about .media__caption {
  padding: 10px 2px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-hero__media {
  align-self: end;
}

/* 起点 */
.page-about .about-origin {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--cream);
}

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

.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.9;
  color: #241d16;
}

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

.page-about .about-origin__aside {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .note {
  padding: 2px 0 2px 14px;
  border-left: 1px solid var(--copper);
}

.page-about .note .mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--signal);
}

.page-about .note p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: #3b3229;
}

/* 团队分工 */
.page-about .about-team {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--paper);
  border-top: var(--line-copper-soft);
  border-bottom: var(--line-copper-soft);
}

.page-about .about-team__media {
  margin: 0 0 28px;
}

.page-about .team-bar {
  display: flex;
  margin: 0 0 22px;
  min-height: 58px;
  border: var(--line-copper-strong);
}

.page-about .team-bar__seg {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  min-width: 0;
  padding: 10px;
  overflow: hidden;
  color: var(--cream);
}

.page-about .team-bar__seg--edit {
  flex: 18 1 0;
  background: var(--ink-green);
}

.page-about .team-bar__seg--test {
  flex: 8 1 0;
  background: var(--lacquer);
}

.page-about .team-bar__seg--design {
  flex: 6 1 0;
  background: var(--copper);
  color: var(--char);
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  letter-spacing: .02em;
}

.page-about .team-bar__name {
  font-size: 10px;
  letter-spacing: .12em;
  white-space: nowrap;
}

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

.page-about .team-detail {
  background: var(--cream);
  border: var(--line-copper);
}

.page-about .team-detail summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-green);
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-detail summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--signal);
}

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

.page-about .team-detail summary .mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--copper);
}

.page-about .team-detail ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0 16px 16px;
  list-style: none;
}

.page-about .team-detail li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: #2b241c;
}

.page-about .team-detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  background: var(--copper);
}

/* 四道工序 */
.page-about .about-process {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--ink-green);
  color: var(--cream);
  border-top: var(--line-copper-strong);
}

.page-about .about-process .about-h2 {
  color: var(--paper);
}

.page-about .about-process .eyebrow {
  color: var(--copper-hi);
}

.page-about .steps {
  display: grid;
  gap: 26px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  padding: 18px 0 0;
  border-top: var(--line-copper);
}

.page-about .step__plate {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 32px;
  padding: 0 6px;
  background: var(--lacquer);
  border: 1px solid var(--copper);
  color: var(--copper-hi);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
}

.page-about .step__title {
  margin: 14px 0 8px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .step__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(243, 235, 220, .8);
}

.page-about .step__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--copper-hi);
}

/* 时间轴 */
.page-about .about-timeline {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--cream);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: 36px;
}

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

.page-about .tl {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--copper) 0%, rgba(192, 135, 75, .2) 100%);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 30px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 12px;
  width: 9px;
  height: 9px;
  background: var(--cream);
  border: 1px solid var(--copper);
  transform: rotate(45deg);
  transition: background-color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .tl__item:hover::before {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .tl__year {
  display: block;
  font-family: var(--font-display);
  font-stretch: 82%;
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 34px);
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--ink-green);
  transition: color .22s var(--ease);
}

.page-about .tl__item:hover .tl__year {
  color: var(--signal);
}

.page-about .tl__title {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--char);
}

.page-about .tl__text {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.8;
  color: #3b3229;
}

.page-about .tl__out {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--copper);
}

.page-about .about-timeline__aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-timeline__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: .05em;
  color: #6b5c49;
}

/* 协作网络 */
.page-about .about-partners {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--ink-deep);
  color: var(--cream);
}

.page-about .about-partners .about-h2 {
  color: var(--paper);
}

.page-about .about-partners .eyebrow {
  color: var(--copper-hi);
}

.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(192, 135, 75, .35);
  border: 1px solid rgba(192, 135, 75, .35);
}

.page-about .stats__item {
  display: grid;
  gap: 6px;
  padding: 18px 14px;
  background: var(--ink-deep);
}

.page-about .stats__num {
  font-family: var(--font-display);
  font-stretch: 82%;
  font-weight: 800;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--copper-hi);
}

.page-about .stats__label {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: rgba(243, 235, 220, .78);
}

/* 质量底线 */
.page-about .about-quality {
  padding: clamp(52px, 8vw, 96px) 0;
  background: var(--paper);
  border-top: var(--line-copper-soft);
}

.page-about .quality {
  margin: 24px 0 0;
  padding: 0;
}

.page-about .quality__row {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-top: var(--line-copper);
}

.page-about .quality__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--signal);
}

.page-about .quality__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #241d16;
}

/* 收束 */
.page-about .about-closing {
  padding: clamp(56px, 9vw, 104px) 0;
  background: var(--ink-green);
  color: var(--cream);
  border-top: var(--line-copper-strong);
}

.page-about .about-closing__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-stretch: 82%;
  font-weight: 800;
  letter-spacing: -.02em;
  font-size: clamp(22px, 4vw, 34px);
  color: var(--paper);
}

.page-about .about-closing__text {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 235, 220, .82);
}

.page-about .about-closing__quote {
  margin: 0 0 28px;
  padding-left: 18px;
  border-left: 3px solid var(--signal);
  max-width: 24em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 3vw, 26px);
  line-height: 1.62;
  color: var(--paper);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 断点 */
@media (min-width: 720px) {
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .about-closing__actions .btn {
    min-width: 168px;
  }
}

@media (min-width: 760px) {
  .page-about .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .team-details {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 64px);
  }

  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--about-col-gap);
    align-items: end;
  }

  .page-about .about-hero__text {
    grid-column: 1 / span 7;
    padding-bottom: 62px;
  }

  .page-about .about-hero__media {
    grid-column: 8 / span 5;
  }

  .page-about .about-origin__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--about-col-gap);
  }

  .page-about .about-origin__main {
    grid-column: 1 / span 7;
  }

  .page-about .about-origin__aside {
    grid-column: 9 / span 4;
    padding-top: 56px;
  }

  .page-about .quality__row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }

  .page-about .about-closing__quote {
    margin-left: auto;
    margin-right: 6%;
    max-width: 20em;
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: var(--about-col-gap);
    align-items: start;
  }
}

@media (min-width: 1060px) {
  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .tl__year {
    transition: none;
  }
}