.page-about {
  --about-band-gap: clamp(56px, 8vw, 104px);
  --about-rail: 84px;
  background: var(--ink);
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 52px) clamp(48px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold) 35%, var(--gold-light) 55%, transparent);
  opacity: .6;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -140px;
  right: -180px;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle at center, rgba(200, 162, 74, .16), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__copy {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(29px, 5.1vw, 54px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--mist);
  max-width: 17em;
}

.page-about .about-hero .lede {
  margin-top: 20px;
  color: var(--silver);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  max-width: 44em;
}

.page-about .about-hero__text {
  margin-top: 16px;
  color: var(--steel);
  font-size: 15px;
  line-height: 1.85;
  max-width: 46em;
}

.page-about .about-hero .btn-row {
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-hero__media {
  position: relative;
  border: 1px solid var(--line-gold);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__media .media__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 宽窄交替章节 ---------- */
.page-about .about-band {
  padding-block: clamp(44px, 6.5vw, 84px);
}

.page-about .about-band + .about-band {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-band--timeline {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 45%, var(--ink) 100%);
}

.page-about .about-band__inner {
  display: grid;
  gap: clamp(28px, 4.5vw, 48px);
}

.page-about .about-band__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-band__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.6vw, 54px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold-dark);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .about-band__num {
    color: transparent;
    -webkit-text-stroke: 1px var(--gold);
  }
}

.page-about .about-band__label {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-band__head {
  max-width: 62em;
}

.page-about .about-band__head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.015em;
  color: var(--mist);
}

.page-about .about-band__head .lede {
  margin-top: 16px;
  color: var(--silver);
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.82;
  max-width: 44em;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0 0 0 28px;
  list-style: none;
  display: grid;
  gap: 30px;
  border-left: 1px solid var(--line-gold);
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__dot {
  position: absolute;
  left: -33px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(200, 162, 74, .14);
}

.page-about .timeline__dot--ruby {
  background: var(--ruby);
  box-shadow: 0 0 0 4px rgba(166, 37, 59, .18);
}

.page-about .timeline__stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--gold-light);
  text-transform: uppercase;
  padding-bottom: 4px;
  border-bottom: 2px solid rgba(200, 162, 74, .5);
  display: inline-block;
}

.page-about .timeline__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
  max-width: 30em;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(26px, 3.6vw, 40px);
}

.page-about .about-team__media .media {
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}

.page-about .about-team__media .media__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(.2) contrast(1.04);
}

.page-about .about-team__stats {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.page-about .stat {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stat__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.6vw, 52px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold-light);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--gold);
}

.page-about .stat__unit {
  margin-left: 6px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .stat__label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-team__note {
  margin-top: clamp(26px, 3.6vw, 38px);
  max-width: 62em;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--silver);
}

/* ---------- 资质徽章 ---------- */
.page-about .badges {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.page-about .badge {
  position: relative;
  padding: 26px 24px 28px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .badge::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  transition: width .4s var(--ease);
}

.page-about .badge:hover,
.page-about .badge:focus-within {
  border-color: var(--line-gold-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
}

.page-about .badge:hover::after,
.page-about .badge:focus-within::after {
  width: 100%;
}

.page-about .badge__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .badge__name {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .badge__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-creds__strip {
  margin-top: clamp(34px, 4.6vw, 52px);
  padding: clamp(22px, 3vw, 32px) clamp(20px, 3vw, 34px);
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  background: linear-gradient(100deg, rgba(200, 162, 74, .09), rgba(111, 179, 196, .05) 70%, transparent);
  border-left: 1px solid var(--line-gold-strong);
}

.page-about .about-creds__strip .figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--gold-light);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--gold);
}

.page-about .about-creds__strip .figure__label {
  display: block;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 运营原则 ---------- */
.page-about .principles {
  display: grid;
  gap: 22px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .principle {
  position: relative;
  padding: 26px 24px 28px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .principle:hover {
  border-color: var(--line-gold);
  background: var(--ink-3);
}

.page-about .principle__mark {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1;
  color: var(--gold);
  letter-spacing: .08em;
}

.page-about .principle__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.42;
  color: var(--mist);
}

.page-about .principle__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-close {
  margin-top: clamp(34px, 4.6vw, 52px);
  padding-top: clamp(26px, 3.4vw, 38px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-close__text {
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-close .btn-row {
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-band__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-band__rail {
    position: sticky;
    top: 108px;
    display: block;
    padding-bottom: 0;
    border-bottom: 0;
    align-self: start;
  }

  .page-about .about-band__label {
    display: block;
    margin-top: 12px;
    writing-mode: vertical-rl;
    letter-spacing: .3em;
  }

  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 22px;
    padding: 46px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-gold);
  }

  .page-about .timeline__item {
    padding-right: 14px;
  }

  .page-about .timeline__dot {
    left: 0;
    top: -51px;
  }

  .page-about .timeline__text {
    max-width: none;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about {
    --about-rail: 104px;
  }
}

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