.page-about {
  --about-line: rgba(16, 17, 20, .14);
  --about-line-light: rgba(245, 241, 232, .18);
  --about-pad: clamp(2.75rem, 6vw, 5.5rem);
  --about-sticky: 5.5rem;
  background: var(--bone);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2rem, 4.5vw, 3.5rem);
  background: var(--ink);
  color: var(--bone);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -2;
  top: -28%;
  right: -18%;
  width: min(78%, 860px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, var(--milan-red), var(--milan-red-deep));
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 72%);
  opacity: .9;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--sky), var(--yellow), var(--ember));
  opacity: .8;
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(245, 241, 232, .7);
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--yellow);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--bone);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: center;
  margin-top: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .about-hero .eyebrow {
  color: var(--yellow);
}

.page-about .about-hero h1 {
  margin: .6rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  margin-top: 1.15rem;
  max-width: 34em;
  color: rgba(245, 241, 232, .82);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-hero__media {
  position: relative;
  border: 1px solid var(--about-line-light);
  background: var(--night);
  clip-path: polygon(0 4%, 100% 0, 100% 100%, 0 96%);
}

.page-about .about-hero__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__media .media-frame__caption {
  position: static;
  display: block;
  padding: .6rem .85rem;
  background: rgba(11, 12, 15, .82);
  color: rgba(245, 241, 232, .68);
  font-size: var(--fs-label);
  letter-spacing: .08em;
  line-height: 1.5;
}

/* 数据条 */
.page-about .about-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(2rem, 4.5vw, 3.25rem);
  border-top: 1px solid var(--about-line-light);
  border-left: 1px solid var(--about-line-light);
}

.page-about .about-bar__cell {
  padding: clamp(.85rem, 2vw, 1.25rem);
  border-right: 1px solid var(--about-line-light);
  border-bottom: 1px solid var(--about-line-light);
}

.page-about .about-bar__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  line-height: 1.05;
  color: var(--bone);
}

.page-about .about-bar__unit {
  font-size: .52em;
  margin-left: .12em;
  color: var(--yellow);
}

.page-about .about-bar__label {
  display: block;
  margin-top: .45rem;
  font-size: var(--fs-label);
  letter-spacing: .12em;
  color: rgba(245, 241, 232, .62);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: var(--about-pad);
}

.page-about .about-chapter--lined {
  border-top: 1px solid var(--about-line);
  background: var(--paper-white);
}

.page-about .about-chapter--night {
  background: var(--night);
  color: var(--bone);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  line-height: .88;
  letter-spacing: -.04em;
  color: var(--milan-red);
}

@supports ((-webkit-text-stroke: 1px #000)) {
  .page-about .chapter-num {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--milan-red);
  }
}

.page-about .about-chapter--night .chapter-num {
  color: var(--sky);
  -webkit-text-stroke: 0;
}

.page-about .about-chapter__index h2 {
  margin: .7rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-h2);
  line-height: 1.14;
  letter-spacing: -.015em;
  text-wrap: balance;
}

.page-about .about-chapter--night .about-chapter__index h2 {
  color: var(--bone);
}

.page-about .about-chapter__body > p {
  max-width: 40em;
  line-height: 1.85;
}

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

.page-about .about-chapter--night .about-chapter__body > p {
  color: rgba(245, 241, 232, .82);
}

.page-about .about-chapter__body .lede {
  margin-bottom: 1.35rem;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.75;
}

.page-about .about-chapter--night .about-chapter__body .lede {
  color: rgba(245, 241, 232, .9);
}

.page-about .about-subhead {
  margin: clamp(1.9rem, 4vw, 2.6rem) 0 .9rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-h3);
  letter-spacing: -.01em;
}

/* ---------- 色卡条 ---------- */
.page-about .about-swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(122px, 1fr));
  gap: .65rem;
  margin: clamp(1.6rem, 3.5vw, 2.2rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-swatch {
  padding-top: .6rem;
  border-top: 4px solid var(--swatch, var(--milan-red));
}

.page-about .about-swatch:nth-child(1) { --swatch: var(--milan-red); }
.page-about .about-swatch:nth-child(2) { --swatch: var(--ink); }
.page-about .about-swatch:nth-child(3) { --swatch: var(--sky); }
.page-about .about-swatch:nth-child(4) { --swatch: var(--teal); }
.page-about .about-swatch:nth-child(5) { --swatch: var(--yellow); }

.page-about .about-swatch__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-sm);
  letter-spacing: .04em;
}

.page-about .about-swatch__use {
  display: block;
  margin-top: .2rem;
  font-size: var(--fs-label);
  letter-spacing: .06em;
  color: var(--ridge);
}

/* ---------- 时间轴 ---------- */
.page-about .about-chronicle {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .timeline {
  display: grid;
  gap: .7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: .85rem;
  padding: .95rem 1rem;
  background: var(--bone);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--milan-red);
  border-radius: var(--radius);
  transition: transform .25s ease, box-shadow .25s ease, border-left-color .25s ease;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.35;
  letter-spacing: -.02em;
  color: var(--milan-red);
}

.page-about .timeline__body h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  line-height: 1.35;
  letter-spacing: -.005em;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--ridge);
}

@media (hover: hover) {
  .page-about .timeline__item:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 26px rgba(16, 17, 20, .13);
    border-left-color: var(--sky);
  }
}

.page-about .about-chronicle__figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-chronicle__figure .media-frame__caption {
  position: static;
  display: block;
  padding: .6rem .8rem;
  background: var(--ink);
  color: rgba(245, 241, 232, .7);
  font-size: var(--fs-label);
  letter-spacing: .06em;
  line-height: 1.55;
}

/* ---------- 数据列表 ---------- */
.page-about .data-list {
  margin: 0 0 1.4rem;
  border-top: 1px solid var(--about-line-light);
}

.page-about .data-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: .3rem 1rem;
  padding-block: .8rem;
  border-bottom: 1px solid var(--about-line-light);
}

.page-about .data-row__label {
  font-size: var(--fs-sm);
  letter-spacing: .05em;
  color: rgba(245, 241, 232, .74);
}

.page-about .data-row__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  letter-spacing: -.01em;
  color: var(--sky);
}

.page-about .about-data__figure {
  margin-top: clamp(1.5rem, 3.5vw, 2.2rem);
  border: 1px solid var(--about-line-light);
}

.page-about .about-data__figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-data__figure .media-frame__caption {
  position: static;
  display: block;
  padding: .6rem .85rem;
  background: var(--ink-soft);
  color: rgba(245, 241, 232, .7);
  font-size: var(--fs-label);
  letter-spacing: .06em;
  line-height: 1.55;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: .8rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.page-about .team-card {
  padding: 1rem 1.05rem 1.1rem;
  background: var(--paper-white);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--milan-red);
  border-radius: var(--radius);
}

.page-about .team-card:nth-child(2) { border-top-color: var(--sky); }
.page-about .team-card:nth-child(3) { border-top-color: var(--teal); }

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.85rem;
  line-height: 1;
  color: var(--ink);
}

.page-about .team-card__label {
  display: block;
  margin-top: .35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-sm);
  letter-spacing: .1em;
  color: var(--milan-red);
}

.page-about .team-card__desc {
  margin: .55rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.72;
  color: var(--ridge);
}

/* ---------- 生态与荣誉 ---------- */
.page-about .eco-list {
  display: grid;
  gap: .6rem;
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}

.page-about .eco-list__item {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .7rem .9rem;
  background: var(--paper-white);
  border-left: 3px solid var(--sky);
}

.page-about .eco-list__item:nth-child(2) { border-left-color: var(--yellow); }
.page-about .eco-list__item:nth-child(3) { border-left-color: var(--teal); }

.page-about .eco-list__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--milan-red);
}

.page-about .eco-list__label {
  font-size: var(--fs-sm);
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .honor-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  background: var(--ink);
  color: var(--bone);
  border-top: 6px solid var(--milan-red);
}

.page-about .contact-panel {
  display: grid;
  gap: .6rem;
  margin-bottom: 1.4rem;
}

.page-about .contact-panel__item {
  display: grid;
  gap: .25rem;
  padding: .85rem 1rem;
  background: rgba(245, 241, 232, .05);
  border: 1px solid var(--about-line-light);
  border-left: 3px solid var(--milan-red);
}

.page-about .contact-panel__label {
  font-size: var(--fs-label);
  letter-spacing: .14em;
  color: var(--yellow);
}

.page-about .contact-panel__value {
  font-size: clamp(.95rem, 2vw, 1.08rem);
  line-height: 1.5;
  color: var(--bone);
  word-break: break-word;
}

.page-about .contact-panel__value.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.5rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-bar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline__item {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    gap: 1.1rem;
    padding: 1.1rem 1.25rem;
  }

  .page-about .timeline__year {
    font-size: 1.3rem;
  }

  .page-about .contact-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, .42fr) minmax(0, .58fr);
    align-items: start;
  }

  .page-about .about-chapter__index {
    position: sticky;
    top: var(--about-sticky);
  }

  .page-about .about-hero h1 {
    max-width: 15em;
  }
}

@media (min-width: 1080px) {
  .page-about .about-chronicle {
    grid-template-columns: minmax(0, 1fr) minmax(0, .62fr);
    align-items: start;
  }

  .page-about .about-chronicle__figure {
    position: sticky;
    top: var(--about-sticky);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__item {
    transition: none;
  }

  .page-about .timeline__item:hover {
    transform: none;
    box-shadow: none;
  }
}