.page-about {
  --about-pad: clamp(1.25rem, 4vw, 2.5rem);
  --about-gap: clamp(1.5rem, 4vw, 3rem);
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: .5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(1rem, 3vw, 2rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 70%;
  background: linear-gradient(112deg, transparent 34%, rgba(212, 175, 55, .10) 50%, transparent 66%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-hero__aside {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.page-about .about-hero__code {
  color: var(--gold);
  font-size: .78rem;
  letter-spacing: .22em;
}

.page-about .about-hero__rule {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .about-hero h1 {
  margin: .5rem 0 0;
  font-size: clamp(2rem, 7vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: .02em;
  font-weight: 900;
  color: var(--frost);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin-top: 1rem;
  max-width: 52ch;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__media {
  margin-top: clamp(1.75rem, 5vw, 3rem);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-hero__lane {
  margin-top: 1.25rem;
  height: 4px;
  background-image: repeating-linear-gradient(90deg, var(--gold) 0 16px, transparent 16px 32px);
  opacity: .35;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-origin__stamp {
  margin-top: .75rem;
  color: var(--gold-light);
  font-size: .78rem;
  letter-spacing: .08em;
  border-left: 2px solid var(--line-strong);
  padding-left: .75rem;
}

.page-about .about-origin__main p {
  color: var(--silver);
  max-width: 62ch;
}

.page-about .about-origin__main p + p {
  margin-top: 1rem;
}

.page-about .about-origin__legend {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .about-origin__legend-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
  padding: .65rem .9rem;
  border: 1px solid var(--line-soft);
  background: var(--panel-2);
  color: var(--silver);
  font-size: .92rem;
}

/* ---------- 历程 ---------- */
.page-about .about-track__list {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
}

.page-about .about-track__item {
  position: relative;
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0 1.35rem 0;
  border-top: 1px solid var(--line);
  outline: none;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

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

.page-about .about-track__num {
  color: var(--gold);
  font-size: .82rem;
  letter-spacing: .16em;
  padding-top: .35rem;
}

.page-about .about-track__meta {
  margin: 0;
  color: var(--slate);
  font-size: .76rem;
  letter-spacing: .12em;
}

.page-about .about-track__title {
  margin: .35rem 0 0;
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  font-weight: 800;
  color: var(--frost);
  letter-spacing: .01em;
}

.page-about .about-track__text {
  margin: .6rem 0 0;
  color: var(--silver);
  max-width: 62ch;
}

.page-about .about-track__detail {
  margin: 0;
  color: var(--gold-light);
  font-size: .9rem;
  max-width: 62ch;
}

.page-about .about-track__item:hover,
.page-about .about-track__item:focus-visible {
  background: linear-gradient(90deg, rgba(212, 175, 55, .08), transparent 72%);
  border-top-color: var(--line-strong);
}

.page-about .about-track__item:focus-visible {
  box-shadow: inset 3px 0 0 var(--gold);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-track__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .3s ease, opacity .3s ease, margin .3s ease;
  }
  .page-about .about-track__item:hover .about-track__detail,
  .page-about .about-track__item:focus-visible .about-track__detail {
    max-height: 12rem;
    opacity: 1;
    margin-top: .6rem;
  }
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__band {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.1rem, 3vw, 1.75rem);
  border: 2px solid var(--line);
  background: linear-gradient(140deg, var(--panel), var(--panel-2));
  box-shadow: var(--shadow-gold);
}

.page-about .about-reach__band-label {
  margin: 0 0 .35rem;
  color: var(--gold);
  font-size: .78rem;
  letter-spacing: .16em;
}

.page-about .about-reach__axis {
  height: 5px;
  background-image: repeating-linear-gradient(90deg, var(--gold) 0 18px, transparent 18px 36px);
  opacity: .45;
  margin-bottom: 1.1rem;
}

.page-about .about-reach__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.page-about .about-reach__node {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .55rem .85rem;
  border: 1px solid var(--line);
  background: var(--ink-deep);
  color: var(--silver);
  font-size: .9rem;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-reach__node:hover {
  border-color: var(--line-strong);
  color: var(--frost);
}

.page-about .about-reach__node--base {
  border-color: var(--line-strong);
  background: linear-gradient(135deg, rgba(212, 175, 55, .18), rgba(212, 175, 55, .04));
  color: var(--gold-light);
}

.page-about .about-reach__code {
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .about-reach__name {
  font-weight: 700;
}

.page-about .about-reach__tag {
  font-style: normal;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--gold-light);
  border-left: 1px solid var(--line-strong);
  padding-left: .5rem;
}

.page-about .about-reach__node--more {
  border-style: dashed;
}

.page-about .about-reach__notes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-reach__note {
  padding-left: 1rem;
  border-left: 2px solid var(--line);
  transition: border-color var(--ease);
}

.page-about .about-reach__note:hover {
  border-left-color: var(--gold);
}

.page-about .about-reach__note-title {
  margin: 0 0 .4rem;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--frost);
}

.page-about .about-reach__note p {
  margin: 0;
  color: var(--silver);
  font-size: .95rem;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-team__media {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line-soft);
  transition: border-color var(--ease);
}

.page-about .about-team__row:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-team__row:hover {
  border-bottom-color: var(--line-strong);
}

.page-about .about-team__name {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--frost);
  letter-spacing: .02em;
}

.page-about .about-team__desc {
  margin: .45rem 0 0;
  color: var(--silver);
  font-size: .95rem;
  max-width: 56ch;
}

.page-about .about-team__figure {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: .3rem;
}

.page-about .about-team__num {
  font-size: clamp(2rem, 6vw, 2.6rem);
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-team__unit {
  font-size: .85rem;
  color: var(--slate);
  letter-spacing: .1em;
}

.page-about .about-team__row--plain .about-team__num {
  color: var(--gold-light);
}

/* ---------- 资质 ---------- */
.page-about .about-cred__plate {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(1.25rem, 3vw, 2rem);
  padding: var(--about-pad);
  border: 2px solid var(--line-strong);
  background: linear-gradient(135deg, var(--panel-2), var(--panel));
  box-shadow: var(--shadow-hard);
}

.page-about .about-cred__label {
  margin: 0;
  color: var(--slate);
  font-size: .76rem;
  letter-spacing: .18em;
}

.page-about .about-cred__value {
  margin: .4rem 0 0;
  font-size: clamp(1.15rem, 4vw, 1.6rem);
  color: var(--gold);
  letter-spacing: .06em;
  word-break: break-all;
}

.page-about .about-cred__note {
  margin: 1rem 0 0;
  color: var(--silver);
  font-size: .95rem;
  max-width: 60ch;
}

.page-about .about-cred__list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: .6rem;
}

.page-about .about-cred__list li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--silver);
  font-size: .95rem;
}

.page-about .about-cred__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6em;
  width: .55rem;
  height: 2px;
  background: var(--gold);
}

.page-about .about-cred__media {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-deep);
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  padding: clamp(1.5rem, 5vw, 2.75rem);
  border: 2px solid var(--line);
  background: linear-gradient(120deg, var(--panel-2), var(--ink));
  box-shadow: var(--shadow-hard);
}

.page-about .about-next h2 {
  margin: .35rem 0 0;
}

.page-about .about-next__lead {
  margin: .85rem 0 0;
  color: var(--silver);
  max-width: 58ch;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-reach__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team__row {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.5rem;
  }
  .page-about .about-team__figure {
    justify-content: flex-end;
    min-width: 5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(64px, .18fr) minmax(0, 1.82fr);
    gap: 2.5rem;
    align-items: start;
  }
  .page-about .about-hero__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding-top: .75rem;
    height: 100%;
  }
  .page-about .about-hero__rule {
    width: 2px;
    flex: 1;
    min-height: 4rem;
    background: linear-gradient(180deg, var(--gold), transparent);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    gap: 3.5rem;
  }

  .page-about .about-track__item {
    grid-template-columns: 4.5rem 1fr;
    gap: 1.75rem;
    padding: 1.75rem 0;
  }
  .page-about .about-track__list {
    margin-left: clamp(0rem, 6vw, 5rem);
  }

  .page-about .about-reach__notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 3.5rem;
  }

  .page-about .about-cred__plate {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item,
  .page-about .about-track__detail,
  .page-about .about-reach__node,
  .page-about .about-team__row,
  .page-about .about-reach__note {
    transition: none;
  }
}