.page-about {
  --about-gold: var(--gold);
  --about-gold-hi: var(--gold-hi);
  --about-line: var(--line);
  --about-ink: var(--ink);
  --about-ivory: var(--ivory);
  --about-shell: var(--shell);
  --about-radius: var(--radius);
  background: var(--ink);
  color: var(--ivory);
}

.page-about .prose {
  max-width: var(--measure);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 64px) 0 clamp(40px, 7vw, 88px);
  background:
    radial-gradient(120% 80% at 88% -10%, rgba(212, 175, 55, 0.16), transparent 62%),
    radial-gradient(90% 70% at 10% 110%, rgba(15, 123, 108, 0.12), transparent 60%),
    linear-gradient(168deg, #141414 0%, #1a1a1a 52%, #101010 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(118deg, rgba(212, 175, 55, 0.06) 0 1px, transparent 1px 22px);
  pointer-events: none;
}

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

.page-about .crumbs {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist-lt);
}

.page-about .crumbs a {
  color: var(--mist-lt);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--gold-hi);
}

.page-about .crumbs__sep {
  margin: 0 8px;
  color: var(--gold-dark);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
  align-items: center;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--jade-lt);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 64px);
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--ivory);
  text-shadow: 0 1px 0 rgba(212, 175, 55, 0.35);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: clamp(64px, 22vw, 148px);
  height: 3px;
  margin-top: 22px;
  background: var(--gold-foil);
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--mist-lt);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist-lt);
}

.page-about .about-hero__fact-num {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--gold-hi);
  margin-right: 6px;
}

.page-about .about-hero__shard {
  position: relative;
  min-height: 120px;
  border-radius: 2px;
  background:
    linear-gradient(135deg, rgba(212, 175, 55, 0.22), rgba(140, 107, 31, 0.05) 70%);
  clip-path: polygon(0 0, 100% 0, 100% 82%, 18% 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 12px;
  padding: 20px;
}

.page-about .about-hero__shard-line {
  display: block;
  height: 2px;
  background: var(--gold-foil);
}

.page-about .about-hero__shard-line--short {
  width: 46%;
}

.page-about .about-hero__media {
  margin: clamp(30px, 5vw, 48px) 0 0;
  border: 1px solid var(--about-line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--ink-deep);
}

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

.page-about .about-hero__media .media-frame__caption {
  padding: 12px 18px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist-lt);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 通用章节 ---------- */
.page-about .section-block {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .section-head {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--gold);
  padding-top: 4px;
}

.page-about .section-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.3;
  color: var(--ivory);
}

.page-about .section-note {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist-lt);
}

/* ---------- 我们是谁 ---------- */
.page-about .about-intro {
  background: linear-gradient(180deg, #101010 0%, #171717 100%);
}

.page-about .about-intro__body p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.95;
  color: #ded9cc;
}

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

/* ---------- 版本演进时间线 ---------- */
.page-about .about-timeline {
  background: var(--ink);
}

.page-about .about-timeline__layout {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-timeline__figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-deep);
  max-height: 420px;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 420px;
  object-fit: cover;
  object-position: center 30%;
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-hi), var(--gold) 40%, rgba(212, 175, 55, 0.15) 100%);
}

.page-about .tl-node {
  position: relative;
  padding: 6px 0 26px;
}

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

.page-about .tl-node__dot {
  position: absolute;
  left: -30px;
  top: 12px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--gold);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .tl-node--current .tl-node__dot {
  background: var(--gold-foil);
  border-color: var(--gold-hi);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.16);
}

.page-about .tl-node__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .tl-node__card {
  padding: 14px 16px;
  border-left: 2px solid var(--line-soft);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.028), transparent 72%);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
}

.page-about .tl-node--current .tl-node__card {
  border-left-color: transparent;
  border: 1px solid var(--about-line);
  border-radius: var(--about-radius);
  background:
    linear-gradient(135deg, rgba(212, 175, 55, 0.14), rgba(20, 20, 20, 0.5) 68%);
}

.page-about .tl-node__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--jade-lt);
}

.page-about .tl-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.45;
  color: var(--ivory);
}

.page-about .tl-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-lt);
}

.page-about .about-timeline__notes {
  margin-top: 30px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: var(--ink-deep);
}

.page-about .about-timeline__notes summary {
  cursor: pointer;
  padding: 16px 20px;
  font-size: 14px;
  color: var(--gold-hi);
  letter-spacing: 0.04em;
  list-style: none;
}

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

.page-about .about-timeline__notes summary::after {
  content: "＋";
  float: right;
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .about-timeline__notes[open] summary::after {
  content: "－";
}

.page-about .about-timeline__notes-body {
  padding: 0 20px 20px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist-lt);
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

.page-about .about-timeline__notes-body p {
  margin: 0 0 12px;
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, #171717 0%, #101010 100%);
}

.page-about .about-team__grid {
  display: grid;
  gap: 20px;
}

.page-about .team-card {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(245, 241, 230, 0.045), rgba(20, 20, 20, 0.28));
  transition: transform 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: -30px;
  right: -22px;
  width: 76px;
  height: 130px;
  background: linear-gradient(150deg, rgba(212, 175, 55, 0.2), transparent 76%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .team-card:hover {
  transform: translateY(-6px);
  border-color: var(--about-line);
}

.page-about .team-card__count {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--gold);
}

.page-about .team-card__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ivory);
}

.page-about .team-card__desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-lt);
}

.page-about .team-card__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card__keys li {
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--jade-lt);
  border: 1px solid rgba(53, 180, 156, 0.4);
  border-radius: 999px;
  opacity: 0.72;
  transition: opacity 200ms var(--ease), background-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .team-card__keys li:first-child {
  background: var(--jade);
  border-color: var(--jade);
  color: var(--ivory);
  opacity: 1;
}

.page-about .team-card:hover .team-card__keys li {
  opacity: 1;
  background: var(--jade);
  border-color: var(--jade);
  color: var(--ivory);
}

.page-about .about-team__note {
  margin-top: 30px;
  padding: 22px clamp(18px, 3vw, 30px);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
  background: linear-gradient(120deg, rgba(212, 175, 55, 0.09), transparent 72%);
}

.page-about .about-team__note p {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.9;
  color: #ded9cc;
}

/* ---------- 频道与内容规模 ---------- */
.page-about .about-scale {
  background: var(--ink-deep);
}

.page-about .about-scale__layout {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-scale__text p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--mist-lt);
}

.page-about .about-scale__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin: 26px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--mist-lt);
}

.page-about .about-scale__facts .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.2;
  color: var(--gold-hi);
}

.page-about .about-scale__figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: #131313;
}

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

.page-about .about-scale__figure .media-frame__caption {
  padding: 12px 16px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-lt);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 三件事 ---------- */
.page-about .about-care {
  background: linear-gradient(180deg, #101010 0%, #171717 100%);
}

.page-about .about-care__grid {
  display: grid;
  gap: 18px;
}

.page-about .care-item {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  background: rgba(245, 241, 230, 0.03);
}

.page-about .care-item__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--gold);
}

.page-about .care-item__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ivory);
}

.page-about .care-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist-lt);
}

/* ---------- 页尾金属横带 ---------- */
.page-about .about-finale {
  position: relative;
  padding: clamp(40px, 6vw, 66px) 0;
  background: var(--gold-foil);
  background-image: var(--gold-foil);
  color: var(--ink-deep);
}

.page-about .about-finale::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(102deg, rgba(26, 26, 26, 0.08) 0 1px, transparent 1px 16px);
  pointer-events: none;
}

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

.page-about .about-finale__lead {
  margin: 0 0 26px;
  max-width: 44em;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.85;
  font-weight: 500;
  color: #1c1a12;
}

.page-about .about-finale__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-finale .btn {
  border-radius: 999px;
  padding: 11px 22px;
}

.page-about .about-finale__ghost {
  color: #1c1a12;
  border-color: rgba(26, 26, 26, 0.5);
  background: transparent;
}

.page-about .about-finale__ghost:hover {
  background: rgba(26, 26, 26, 0.1);
  color: #1c1a12;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-card--mid {
    margin-top: 26px;
  }

  .page-about .team-card--low {
    margin-top: 52px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
  }

  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__figure {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    max-height: 560px;
  }

  .page-about .about-timeline__figure img {
    max-height: 560px;
  }

  .page-about .about-timeline__list {
    padding-left: 96px;
  }

  .page-about .about-timeline__list::before {
    left: 52px;
  }

  .page-about .tl-node {
    padding-bottom: 44px;
  }

  .page-about .tl-node__dot {
    left: 45px;
    top: 16px;
  }

  .page-about .tl-node__no {
    position: absolute;
    left: 0;
    top: 10px;
    margin: 0;
    font-size: 16px;
  }

  .page-about .tl-node__card {
    padding: 18px 22px;
  }

  .page-about .about-scale__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 52px;
  }

  .page-about .about-scale__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-card__keys li {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}