.page-about {
  --about-hair: rgba(18, 38, 31, .14);
  --about-tint: #EDE6DA;
  background-color: #F7F3EC;
  background-image:
    radial-gradient(90% 52% at 102% 0%, rgba(201, 162, 39, .16), rgba(201, 162, 39, 0) 62%),
    radial-gradient(70% 42% at -4% 10%, rgba(176, 106, 74, .12), rgba(176, 106, 74, 0) 70%);
  background-repeat: no-repeat;
  color: #12261F;
}

/* ── 面包屑 ─────────────────────────────── */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding-top: 7.25rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--yl-ink-soft);
}

.page-about .about-crumb a {
  color: var(--yl-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--yl-red);
  border-bottom-color: rgba(201, 162, 39, .6);
}

.page-about .about-crumb__sep {
  color: var(--yl-gold);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--yl-green);
}

/* ── 首屏 ───────────────────────────────── */
.page-about .about-hero {
  padding: 1.5rem 0 3.5rem;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
}

.page-about .about-hero__lead .eyebrow {
  margin: 0;
}

.page-about .about-hero h1 {
  margin: .55rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 10vw, 4.5rem);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--yl-green);
}

.page-about .about-hero h1 em {
  position: relative;
  font-style: normal;
  color: var(--yl-red);
}

.page-about .about-hero h1 em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .02em;
  height: .11em;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--yl-gold) 0%, rgba(201, 162, 39, 0) 92%);
}

.page-about .about-hero__lede {
  margin: 1.5rem 0 0;
  max-width: 34rem;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--yl-ink-soft);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.85rem;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.page-about .about-gem {
  margin: 0;
  border-radius: 20px;
  overflow: hidden;
  background: var(--yl-green);
  box-shadow: 0 34px 70px -48px rgba(18, 38, 31, .95);
}

.page-about .about-gem img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-hero__plate {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .45rem .9rem;
  padding: 1rem 1.15rem;
  border-radius: 16px;
  border: 1px solid rgba(201, 162, 39, .42);
  background: var(--about-tint);
}

.page-about .about-hero__plate-k {
  margin: 0;
  font-size: .78rem;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--yl-stone);
}

.page-about .about-hero__plate-v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .98rem;
  line-height: 1.6;
  text-align: right;
  white-space: nowrap;
  color: var(--yl-green);
}

/* ── 编号与通用文本 ─────────────────────── */
.page-about .about-num {
  margin: 0 0 .6rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--yl-gold-ink);
}

.page-about .about-num--light {
  color: var(--yl-gold-light);
}

.page-about .about-claim .section-title,
.page-about .about-team .section-title,
.page-about .about-standards .section-title,
.page-about .about-partners .section-title,
.page-about .about-next .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 5.4vw, 2.25rem);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0;
}

/* ── 主张声明 ───────────────────────────── */
.page-about .about-claim {
  padding: 3rem 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.6rem;
}

.page-about .about-claim__body p {
  margin: 0 0 1.05rem;
  max-width: 38rem;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--yl-ink-soft);
}

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

.page-about .about-pull {
  margin: 0 0 1.4rem;
  padding-left: 1.15rem;
  border-left: 3px solid var(--yl-clay);
  max-width: 34rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.12rem, 4.2vw, 1.42rem);
  line-height: 1.58;
  color: var(--yl-green);
}

/* ── 成长节点年表 ───────────────────────── */
.page-about .about-timeline {
  position: relative;
  padding: 3.25rem 0 3.25rem;
  overflow: hidden;
  background: var(--yl-green);
  color: var(--yl-paper);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
}

.page-about .about-timeline__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
}

.page-about .about-timeline__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(18, 38, 31, .84) 0%, rgba(18, 38, 31, .94) 55%, rgba(18, 38, 31, .99) 100%);
}

.page-about .about-timeline > .wrap {
  position: relative;
  z-index: 2;
}

.page-about .about-timeline__head {
  max-width: 34rem;
}

.page-about .about-timeline__head .section-title {
  color: var(--yl-paper);
}

.page-about .about-timeline__lede {
  margin: .95rem 0 0;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(247, 243, 236, .72);
}

.page-about .filter-bar {
  display: flex;
  gap: .5rem;
  margin-top: 1.4rem;
  padding: .2rem 0 .9rem;
  overflow-x: auto;
  scrollbar-width: none;
  overscroll-behavior-x: contain;
}

.page-about .filter-bar::-webkit-scrollbar {
  display: none;
}

.page-about .filter-chip {
  flex: 0 0 auto;
  padding: .42rem .95rem;
  border-radius: 999px;
  border: 1px solid rgba(201, 162, 39, .35);
  background: transparent;
  color: rgba(247, 243, 236, .82);
  font-family: var(--font-body);
  font-size: .82rem;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .filter-chip:hover {
  border-color: var(--yl-gold-light);
  color: var(--yl-paper);
}

.page-about .filter-chip[aria-pressed="true"] {
  background: var(--yl-red);
  border-color: var(--yl-red);
  color: #fff;
}

.page-about .filter-chip:focus-visible {
  outline: 2px solid var(--yl-neon);
  outline-offset: 2px;
}

.page-about .about-track {
  display: flex;
  gap: 1rem;
  padding: .5rem .25rem 1.3rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(201, 162, 39, .5) transparent;
}

.page-about .about-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-track::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(201, 162, 39, .5);
}

.page-about .about-node {
  flex: 0 0 79%;
  max-width: 21rem;
  scroll-snap-align: start;
  padding: 1.2rem 1.15rem 1.35rem;
  border: 1px solid rgba(201, 162, 39, .26);
  border-radius: 16px;
  background: linear-gradient(165deg, rgba(232, 199, 102, .10), rgba(247, 243, 236, .02));
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

@media (hover: hover) {
  .page-about .about-node:hover {
    transform: translateY(-2px);
    border-color: var(--yl-gold);
  }
}

.page-about .about-node__dot {
  display: block;
  width: 13px;
  height: 13px;
  margin-bottom: .85rem;
  border: 2px solid var(--yl-gold);
  border-radius: 50%;
}

.page-about .about-node--now .about-node__dot {
  border-color: var(--yl-neon);
  box-shadow: 0 0 0 5px rgba(91, 75, 224, .20), 0 0 16px 2px rgba(91, 75, 224, .55);
}

.page-about .about-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--yl-gold-light);
}

.page-about .about-node__title {
  margin: .35rem 0 .55rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.12rem;
  line-height: 1.42;
  color: var(--yl-paper);
}

.page-about .about-node__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.82;
  color: rgba(247, 243, 236, .7);
}

/* ── 团队四条线 ─────────────────────────── */
.page-about .about-team {
  padding: 3.25rem 0 3rem;
}

.page-about .about-team .section-head {
  max-width: 34rem;
}

.page-about .about-team__shot {
  margin: 1.75rem 0 2.25rem;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 60px -50px rgba(18, 38, 31, .9);
}

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

.page-about .about-team__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.65rem;
}

.page-about .about-lane {
  padding-top: 1rem;
  border-top: 2px solid var(--about-hair);
  transition: border-color .3s var(--ease);
}

.page-about .about-lane:hover {
  border-color: var(--yl-clay);
}

.page-about .about-lane__name {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.35rem;
  line-height: 1.32;
  color: var(--yl-green);
}

.page-about .about-lane__role {
  margin: 0 0 .8rem;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--yl-ink-soft);
}

.page-about .about-lane__iface {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--yl-moss);
}

/* ── 服务标准 ───────────────────────────── */
.page-about .about-standards {
  padding: 3rem 0;
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
  background: var(--about-tint);
}

.page-about .about-standards__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.85rem;
}

.page-about .about-standards__lede {
  margin: .95rem 0 0;
  max-width: 32rem;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--yl-ink-soft);
}

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

.page-about .about-std__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .25rem;
  padding: .95rem 0;
  border-top: 1px solid rgba(18, 38, 31, .12);
}

.page-about .about-std__row:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.page-about .about-std dt {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--yl-clay);
}

.page-about .about-std dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--yl-green);
}

/* ── 合作生态 ───────────────────────────── */
.page-about .about-partners {
  padding: 3rem 0;
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.6rem;
}

.page-about .about-partners__body p {
  margin: 0 0 1rem;
  max-width: 38rem;
  font-size: 1rem;
  line-height: 1.95;
  color: var(--yl-ink-soft);
}

.page-about .about-partners__list {
  margin: 1.35rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .85rem;
}

.page-about .about-partners__list li {
  position: relative;
  padding-left: 1.3rem;
  max-width: 38rem;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--yl-ink-soft);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  border: 2px solid var(--yl-gold);
}

/* ── 下一步入口 ─────────────────────────── */
.page-about .about-next {
  padding: 3rem 0 4.5rem;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-next__list {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .8rem;
}

.page-about .about-next__list a {
  display: block;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--about-hair);
  border-radius: 14px;
  background: rgba(237, 230, 218, .6);
  text-decoration: none;
  color: var(--yl-green);
  transition: border-color .3s var(--ease), transform .3s var(--ease), background-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-next__list a:hover {
  border-color: var(--yl-line-gold);
  background: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-next__list a:focus-visible {
  outline: 2px solid var(--yl-neon);
  outline-offset: 3px;
}

.page-about .about-next__key {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.14rem;
  line-height: 1.4;
}

.page-about .about-next__key::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: .95rem;
  color: var(--yl-red);
  transition: transform .3s var(--ease);
}

.page-about .about-next__list a:hover .about-next__key::after {
  transform: translateX(3px);
}

.page-about .about-next__sub {
  display: block;
  margin-top: .4rem;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--yl-ink-soft);
}

/* ── 桌面端 ─────────────────────────────── */
@media (min-width: 60rem) {
  .page-about .about-hero {
    padding: 2.25rem 0 4.75rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .84fr);
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 17rem) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-claim,
  .page-about .about-team,
  .page-about .about-partners,
  .page-about .about-next {
    padding-top: 4rem;
  }

  .page-about .about-claim {
    padding-bottom: 4rem;
  }

  .page-about .about-timeline {
    padding: 4.25rem 0 4rem;
  }

  .page-about .about-track {
    padding-bottom: 1.75rem;
  }

  .page-about .about-node {
    flex: 0 0 19rem;
    max-width: none;
  }

  .page-about .about-team__list {
    grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
    gap: 1.75rem 2.25rem;
    align-items: start;
  }

  .page-about .about-lane__name {
    font-size: 1.18rem;
  }

  .page-about .about-lane--1 .about-lane__name {
    font-size: 1.95rem;
  }

  .page-about .about-lane--4 .about-lane__name {
    font-size: 1.5rem;
  }

  .page-about .about-standards {
    padding: 4rem 0;
  }

  .page-about .about-standards__grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.3fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-std__row {
    grid-template-columns: 10rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-next {
    padding-bottom: 5.5rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-next__list a,
  .page-about .filter-chip,
  .page-about .about-next__key::after {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-next__list a:hover {
    transform: none;
  }
}