.page-about {
  --about-rail-w: 120px;
  --about-ink-soft: var(--ink-2);
}

.page-about .about-top {
  padding: 26px 0 34px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-top__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-top__kicker {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--apricot-deep);
}

.page-about .about-top h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--ink);
  font-weight: 700;
  max-width: 16em;
}

.page-about .about-top__lead {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-top__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.page-about .about-fact:nth-child(2n) {
  border-right: 0;
}

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

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-fact__value {
  font-size: 24px;
  line-height: 1.1;
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-fact__value i {
  font-style: normal;
  font-size: 12px;
  margin-left: 3px;
  color: var(--muted);
  font-weight: 400;
}

/* 品牌主张 */
.page-about .about-claim {
  padding: 40px 0 44px;
}

.page-about .about-claim__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-claim h2 {
  margin: 0 0 16px;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-claim__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 36em;
}

.page-about .about-claim__points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-claim__points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-claim__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 9px;
  background: var(--apricot);
  border-radius: 1px;
}

.page-about .about-claim__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 10px;
}

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

/* 历程 */
.page-about .about-timeline {
  padding: 40px 0 48px;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(var(--line), var(--line)) 0 0 / 100% 1px no-repeat;
}

.page-about .about-timeline__head {
  margin-bottom: 28px;
}

.page-about .about-timeline__body {
  display: grid;
  gap: 24px;
}

.page-about .about-timeline__railcap {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-timeline__raillist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__raillink {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  border-radius: var(--radius);
  transition: border-color .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-timeline__raillink:hover,
.page-about .about-timeline__raillink:focus-visible {
  border-color: var(--apricot);
  background: var(--apricot-wash);
  color: var(--apricot-deep);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  border-left: 2px solid var(--line);
  padding-left: 18px;
}

.page-about .about-stage {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  scroll-margin-top: calc(var(--statusbar-h) + 20px);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 10px;
  height: 10px;
  background: var(--apricot);
  border-radius: 0;
}

.page-about .about-stage__year {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--apricot-deep);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-stage__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 38em;
}

.page-about .about-stage__note {
  margin: 0;
  padding: 9px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mint-ink);
  background: var(--mint-wash);
  border-left: 2px solid var(--mint);
}

.page-about .about-timeline__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 10px;
}

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

/* 方法论 */
.page-about .about-method {
  padding: 44px 0 48px;
  border-top: 1px solid var(--line);
}

.page-about .about-method__figure {
  margin: 0 0 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 10px;
}

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

.page-about .about-steps {
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  border: 1px solid var(--line);
  border-top-width: 3px;
  border-top-color: var(--apricot);
  background: var(--panel);
  border-radius: var(--radius);
}

.page-about .about-step:nth-child(2) {
  border-top-color: var(--sticky);
}

.page-about .about-step:nth-child(3) {
  border-top-color: var(--mint);
}

.page-about .about-step:nth-child(4) {
  border-top-color: var(--ink);
}

.page-about .about-step__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 14px 14px 13px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .about-step__num {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-step__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.page-about .about-step__hint {
  position: relative;
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.page-about .about-step__hint::before,
.page-about .about-step__hint::after {
  content: "";
  position: absolute;
  background: var(--ink-2);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.page-about .about-step__hint::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1.5px;
}

.page-about .about-step__hint::after {
  left: 7px;
  top: 0;
  width: 1.5px;
  height: 16px;
}

.page-about .about-step[open] .about-step__hint::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-step__body {
  padding: 0 14px 16px;
  border-top: 1px solid var(--line);
  margin-top: 0;
  padding-top: 13px;
}

.page-about .about-step__body > p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-step__facts {
  margin: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-step__facts dt {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mint-ink);
}

.page-about .about-step__facts dd {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-step__facts dd:last-child {
  margin-bottom: 0;
}

/* 团队 */
.page-about .about-team {
  padding: 44px 0 48px;
  border-top: 1px solid var(--line);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  --role-color: var(--apricot);
  padding: 18px 16px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--role-color);
}

.page-about .about-role:nth-child(2) {
  --role-color: var(--ink);
}

.page-about .about-role:nth-child(3) {
  --role-color: var(--mint);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-role__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.page-about .about-role__count {
  font-size: 26px;
  line-height: 1;
  font-weight: 600;
  color: var(--role-color);
}

.page-about .about-role__count i {
  font-style: normal;
  font-size: 12px;
  margin-left: 3px;
  color: var(--muted);
  font-weight: 400;
}

.page-about .about-role__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* 行业 */
.page-about .about-industries {
  padding: 44px 0 48px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-ind {
  padding: 20px 18px 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.page-about .about-ind__cat {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--apricot-deep);
  background: var(--apricot-wash);
  border-radius: var(--radius);
}

.page-about .about-ind__title {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-ind__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* 合作与验收 */
.page-about .about-engagement {
  padding: 44px 0 48px;
  border-top: 1px solid var(--line);
}

.page-about .about-engagement__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-engagement__sub {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.005em;
}

.page-about .about-engagement__sub:not(:first-child) {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-week {
  display: grid;
  grid-template-columns: 4px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 11px 14px 11px 0;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-week__bar {
  align-self: stretch;
  background: var(--apricot);
}

.page-about .about-week:nth-child(2) .about-week__bar {
  background: var(--sticky);
}

.page-about .about-week:nth-child(3) .about-week__bar {
  background: var(--mint);
}

.page-about .about-week__name {
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-week__len {
  font-size: 14px;
  color: var(--apricot-deep);
  padding-right: 14px;
}

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

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

.page-about .about-support {
  padding: 18px 16px 20px;
  background: var(--apricot-wash);
  border-left: 3px solid var(--apricot);
}

.page-about .about-support--mint {
  background: var(--mint-wash);
  border-left-color: var(--mint);
}

.page-about .about-support__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-support__value {
  margin: 0 0 10px;
  font-size: 28px;
  line-height: 1.05;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-support__value i {
  font-style: normal;
  font-size: 13px;
  color: var(--muted);
  font-weight: 400;
}

.page-about .about-support__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

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

/* 收束 */
.page-about .about-next {
  padding: 0 0 56px;
}

.page-about .about-next__inner {
  padding: 30px 22px 32px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--apricot);
  background: var(--panel);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-next__text {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

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

.page-about .about-next__actions .btn {
  text-decoration: none;
}

/* 断点 */
@media (min-width: 700px) {
  .page-about .about-top {
    padding: 34px 0 42px;
  }

  .page-about .about-top__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

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

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 960px) {
  .page-about .about-claim {
    padding: 56px 0 60px;
  }

  .page-about .about-timeline,
  .page-about .about-method,
  .page-about .about-team,
  .page-about .about-industries,
  .page-about .about-engagement {
    padding: 60px 0 64px;
  }

  .page-about .about-timeline__body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: calc(var(--statusbar-h) + 28px);
    align-self: start;
  }

  .page-about .about-timeline__raillist {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
  }

  .page-about .about-timeline__raillink {
    display: block;
    text-align: left;
    border-color: transparent;
    background: transparent;
    padding: 7px 10px;
    border-left: 2px solid var(--line);
  }

  .page-about .about-timeline__list {
    border-left: 0;
    padding-left: 0;
    gap: 20px;
  }

  .page-about .about-stage {
    padding: 20px 22px 22px;
  }

  .page-about .about-stage::before {
    display: none;
  }

  .page-about .about-timeline__figure {
    grid-column: 1 / -1;
    max-width: 420px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }

  .page-about .about-step:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-step:nth-child(3) {
    margin-top: 12px;
  }

  .page-about .about-step:nth-child(4) {
    margin-top: 38px;
  }

  .page-about .about-engagement__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-next__inner {
    padding: 40px 36px 42px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-industries__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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