.page-about {
  --about-col: 56px;
  --about-gap: 18px;
}

@media (min-width: 860px) {
  .page-about {
    --about-col: 96px;
    --about-gap: 32px;
  }
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(44px, 7vw, 88px);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--flame) 0%, var(--flame-soft) 38%, rgba(255, 90, 31, 0) 100%);
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(20px, 3.4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 6vw, 96px);
    align-items: start;
  }
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-stretch: 88%;
  font-size: clamp(34px, 6.6vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: min(100%, 620px);
}

.page-about .about-hero__p {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 40ch;
  color: var(--slate);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__anchor {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(16px, 2.4vw, 24px) 0;
}

.page-about .about-hero__anchor-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
  text-transform: uppercase;
}

.page-about .about-hero__year {
  margin: 6px 0 0;
  font-size: clamp(58px, 13vw, 104px);
  line-height: 0.9;
  letter-spacing: 0.01em;
  color: var(--flame);
}

.page-about .about-hero__anchor-note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
  max-width: 32ch;
}

.page-about .about-hero__facts {
  margin: 20px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 14px;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--line-cool);
}

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

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
  text-align: right;
}

/* ---------- 通用章节头 ---------- */

.page-about .about-head {
  max-width: 760px;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-stretch: 88%;
  font-size: clamp(26px, 4.4vw, 50px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: inherit;
}

.page-about .section--dark .about-head h2 {
  color: var(--paper);
}

.page-about .about-head__note {
  margin: 16px 0 0;
  color: var(--slate);
  font-size: 16px;
}

.page-about .section--dark .about-head__note {
  color: var(--paper-70);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(32px, 5vw, 64px) 0 0;
  padding: 0;
}

.page-about .timeline__node {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-col) minmax(0, 1fr);
  column-gap: var(--about-gap);
  padding-bottom: clamp(34px, 6vw, 76px);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: calc(var(--about-col) + var(--about-gap) / 2);
  top: 12px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__node::after {
  content: "";
  position: absolute;
  left: calc(var(--about-col) + var(--about-gap) / 2 - 4px);
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--flame);
}

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

.page-about .timeline__node:last-child::before {
  display: none;
}

.page-about .timeline__year {
  margin: 0;
  padding-right: 6px;
  text-align: right;
  font-size: clamp(17px, 2.4vw, 26px);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .timeline__body h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.35;
  color: var(--ink);
}

.page-about .timeline__body p {
  margin: 10px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .timeline__media {
  margin: clamp(18px, 3vw, 28px) 0 0;
}

/* ---------- 团队 ---------- */

.page-about .about-team__media {
  margin: clamp(28px, 4vw, 44px) 0 clamp(28px, 4vw, 48px);
}

.page-about .about-team__media .media__cap {
  margin-top: 10px;
  font-size: 13px;
  color: var(--slate);
}

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

.page-about .crew__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name num"
    "bar  bar"
    "desc desc";
  gap: 4px 16px;
  align-items: baseline;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--line-cool);
}

.page-about .crew__row:last-child {
  border-bottom: 1px solid var(--line-cool);
}

.page-about .crew__name {
  grid-area: name;
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--ink);
}

.page-about .crew__num {
  grid-area: num;
  margin: 0;
  font-size: clamp(19px, 2.4vw, 24px);
  letter-spacing: 0.02em;
  color: var(--indigo);
}

.page-about .crew__desc {
  grid-area: desc;
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .crew__bar {
  grid-area: bar;
  position: relative;
  height: 6px;
  margin: 10px 0 6px;
  background: rgba(14, 15, 18, 0.10);
  overflow: hidden;
}

.page-about .crew__bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--flame) 0%, var(--flame-soft) 100%);
}

.page-about .crew__row[data-share="28"] .crew__bar span { width: 28%; }
.page-about .crew__row[data-share="43"] .crew__bar span { width: 43%; }
.page-about .crew__row[data-share="18"] .crew__bar span { width: 18%; }
.page-about .crew__row[data-share="11"] .crew__bar span { width: 11%; }

.page-about .crew-notes {
  display: grid;
  gap: 20px;
  margin-top: clamp(28px, 4vw, 44px);
}

@media (min-width: 640px) {
  .page-about .crew-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }
}

.page-about .crew-note {
  border-left: 2px solid var(--copper);
  padding-left: 18px;
}

.page-about .crew-note__value {
  margin: 0;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .crew-note__label {
  margin: 10px 0 0;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 服务网络 ---------- */

.page-about .about-network__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

.page-about .about-network__media .media__cap {
  margin-top: 10px;
  font-size: 13px;
  color: var(--paper-55);
}

.page-about .about-network h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-stretch: 88%;
  font-size: clamp(26px, 4.4vw, 48px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-network__p {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-70);
}

.page-about .about-dots {
  display: grid;
  grid-template-columns: repeat(13, minmax(0, 1fr));
  gap: 6px;
  width: min(100%, 420px);
  margin: clamp(24px, 3.4vw, 36px) 0 0;
}

.page-about .about-dots span {
  display: block;
  aspect-ratio: 1 / 1;
  background: rgba(243, 240, 233, 0.16);
  border: 1px solid var(--line-dark);
}

.page-about .about-dots span.is-hub {
  background: var(--flame);
  border-color: var(--flame);
}

.page-about .hubs {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

@media (min-width: 640px) {
  .page-about .hubs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

.page-about .hubs li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .hubs__city {
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  min-width: 3.4em;
}

.page-about .hubs__role {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-70);
}

/* ---------- 质检 ---------- */

.page-about .qc {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

@media (min-width: 780px) {
  .page-about .qc {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

.page-about .qc__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 168px;
  padding: clamp(16px, 2vw, 22px) clamp(12px, 1.6vw, 18px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .qc__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .qc__cell h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .qc__cell p:not(.qc__idx) {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .qc-stages {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 24px;
  counter-reset: qcs;
}

@media (min-width: 780px) {
  .page-about .qc-stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--line-cool);
  }
  .page-about .qc-stages__item {
    border-right: 1px solid var(--line-cool);
    padding-right: 24px;
    margin-right: 24px;
  }
  .page-about .qc-stages__item:last-child {
    border-right: 0;
    margin-right: 0;
    padding-right: 0;
  }
}

.page-about .qc-stages__item h3 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}

.page-about .qc-stages__item p:not(.qc-stages__idx) {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 34ch;
}

.page-about .qc-stages__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--indigo);
}

/* ---------- 合作与认可 ---------- */

.page-about .about-eco {
  background: var(--char);
  color: var(--paper);
  padding: clamp(48px, 7vw, 96px) 0;
  position: relative;
}

.page-about .about-eco::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--flame) 0%, rgba(255, 90, 31, 0) 78%);
}

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

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

.page-about .about-eco .about-head__note {
  color: var(--paper-70);
}

.page-about .eco-rail {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0 0 14px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid var(--line-dark);
}

.page-about .eco-rail:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 4px;
}

.page-about .eco-card {
  flex: 0 0 clamp(230px, 68vw, 288px);
  scroll-snap-align: start;
  padding: 22px 22px 24px 0;
  margin-right: 22px;
  border-right: 1px solid var(--line-dark);
}

.page-about .eco-card:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

.page-about .eco-card__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .eco-card h3 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .eco-card p:not(.eco-card__idx) {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-70);
}

.page-about .eco-card--award {
  border-right: 0;
}

.page-about .eco-card--award .eco-card__idx {
  color: var(--flame-soft);
}

/* ---------- 下一步 ---------- */

.page-about .next-list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .next-list__item a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "idx title"
    "idx desc";
  column-gap: 18px;
  row-gap: 6px;
  align-items: baseline;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .next-list__item a:hover {
  border-bottom-color: var(--flame);
}

.page-about .next-list__item a:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 3px;
}

.page-about .next-list__idx {
  grid-area: idx;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--copper);
  padding-top: 0.5em;
}

.page-about .next-list__title {
  grid-area: title;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .next-list__desc {
  grid-area: desc;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
  max-width: 52ch;
}

@media (min-width: 780px) {
  .page-about .next-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(32px, 5vw, 72px);
  }
  .page-about .next-list__item:nth-last-child(-n + 2) a {
    border-bottom-color: var(--line);
  }
}

/* ---------- 窄屏收口 ---------- */

@media (max-width: 420px) {
  .page-about .about-hero__facts > div {
    flex-direction: column;
    align-items: flex-start;
  }
  .page-about .about-hero__facts dd {
    text-align: left;
  }
  .page-about .qc {
    grid-template-columns: minmax(0, 1fr);
  }
}
<<<END>>>