.page-about {
  --about-soft: rgba(27, 23, 18, .68);
  --about-hair: rgba(140, 133, 120, .26);
  --about-gap: clamp(3rem, 8vw, 6.5rem);
}

/* ===== 面包屑留白 ===== */
.page-about .breadcrumb {
  margin-top: clamp(1.25rem, 4vw, 2.25rem);
  margin-bottom: clamp(.75rem, 2vw, 1.25rem);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  display: grid;
  gap: clamp(2rem, 6vw, 3.5rem);
  padding-block: clamp(1rem, 3vw, 2rem) var(--about-gap);
}

.page-about .about-hero__title {
  margin: .75rem 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 7.2vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: .005em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  color: var(--about-soft);
}

.page-about .about-hero__figures {
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-figure {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem .75rem;
  padding: clamp(1rem, 3vw, 1.4rem) clamp(1.1rem, 3vw, 1.65rem);
  background: var(--white);
}

.page-about .about-figure:nth-child(2) {
  background: var(--ice);
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 6.5vw, 2.85rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--brand);
}

.page-about .about-figure__cap {
  font-size: .875rem;
  letter-spacing: .02em;
  color: var(--about-soft);
}

@media (min-width: 62rem) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: end;
  }
}

/* ===== 章节标题组 ===== */
.page-about .about-section {
  padding-block: 0 var(--about-gap);
}

.page-about .about-head {
  display: grid;
  gap: .5rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.25rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: .85;
  letter-spacing: -.03em;
  color: var(--brand);
  opacity: .16;
}

.page-about .about-head__lede {
  margin: 0;
  max-width: 52ch;
  color: var(--about-soft);
}

.page-about .section-title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.4vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: .005em;
  color: var(--ink);
}

.page-about .about-head--night .about-head__num {
  color: var(--cyan);
  opacity: .55;
}

/* ===== 图片与图注 ===== */
.page-about .about-figure-wide,
.page-about .about-desk,
.page-about .about-partners__figure {
  margin: 0 0 clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-figure-wide img,
.page-about .about-desk img,
.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--ice);
}

.page-about .about-figure-wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-desk img {
  aspect-ratio: 14 / 9;
}

.page-about .about-partners__figure img {
  aspect-ratio: 10 / 7;
}

.page-about .about-cap {
  margin-top: .625rem;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--about-soft);
}

/* ===== 纵向时间轴 ===== */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: .85rem;
  margin: 0;
  padding: .25rem 0 .25rem 1.75rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: calc(.75rem - 1px);
  top: 1.5rem;
  bottom: 1.5rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand), rgba(47, 224, 200, .85));
  opacity: .3;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.375rem;
  top: 1.15rem;
  width: .75rem;
  height: .75rem;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .timeline__item--now::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cream), 0 0 0 8px rgba(47, 224, 200, .22);
}

.page-about .timeline__summary {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .85rem 1.05rem;
  background: var(--white);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  cursor: pointer;
  list-style: none;
  transition: border-color .22s ease, background-color .22s ease;
}

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

.page-about .timeline__summary::marker {
  content: "";
}

.page-about .timeline__summary:hover,
.page-about .timeline__summary:focus-visible {
  border-color: var(--brand);
}

.page-about .timeline__year {
  flex: none;
  padding: .15rem .55rem;
  border-radius: var(--radius-pill);
  background: rgba(27, 76, 140, .1);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--brand);
}

.page-about .timeline__title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .timeline__more {
  position: relative;
  flex: none;
  width: .875rem;
  height: .875rem;
}

.page-about .timeline__more::before,
.page-about .timeline__more::after {
  content: "";
  position: absolute;
  background: var(--grey);
  border-radius: 2px;
  transition: transform .22s ease, opacity .22s ease;
}

.page-about .timeline__more::before {
  left: 0;
  right: 0;
  top: calc(50% - 1px);
  height: 2px;
}

.page-about .timeline__more::after {
  top: 0;
  bottom: 0;
  left: calc(50% - 1px);
  width: 2px;
}

.page-about .timeline__node[open] .timeline__more::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .timeline__body {
  margin-top: .5rem;
  padding: .95rem 1.15rem;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--brand);
  background: var(--ice);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .about-footnote {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding-left: 1.75rem;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--about-soft);
}

/* ===== 浅蓝色带：团队分工 ===== */
.page-about .about-band {
  margin-inline: clamp(.5rem, 2vw, 1.5rem);
  margin-block: 0 var(--about-gap);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  border-radius: clamp(24px, 4vw, 44px);
  background: var(--ice);
}

.page-about .about-band .about-desk {
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .crew {
  display: grid;
  gap: .875rem;
}

.page-about .crew__row {
  display: grid;
  gap: .35rem;
  padding: 1.05rem 1.2rem 1.15rem;
  border: 1px solid var(--about-hair);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius-md);
  background: var(--white);
}

.page-about .crew__row--cyan {
  border-left-color: var(--cyan-ink);
}

.page-about .crew__row--orange {
  border-left-color: var(--orange-ink);
}

.page-about .crew__row--grey {
  border-left-color: var(--grey);
}

.page-about .crew__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .2rem .75rem;
}

.page-about .crew__role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .crew__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .875rem;
  font-weight: 700;
  color: var(--brand);
}

.page-about .crew__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--about-soft);
}

@media (min-width: 56rem) {
  .page-about .crew__row {
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .crew__meta {
    flex-direction: column;
    gap: .2rem;
  }
}

/* ===== 协作生态 ===== */
.page-about .about-partners {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-partners__text .prose {
  margin: 0;
  color: var(--about-soft);
}

.page-about .about-partners__list {
  display: grid;
  gap: .9rem;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--about-soft);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .5rem;
  height: .5rem;
  border-radius: 2px;
  background: var(--brand);
}

.page-about .about-partners__list li:nth-child(2)::before {
  background: var(--cyan-ink);
}

.page-about .about-partners__list li:nth-child(3)::before {
  background: var(--orange-ink);
}

.page-about .about-partners__list strong {
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-partners__figure {
  margin-bottom: 0;
}

@media (min-width: 56rem) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }
}

/* ===== 夜场深蓝色带：三件事 ===== */
.page-about .about-deep {
  margin-inline: clamp(.5rem, 2vw, 1.5rem);
  margin-block: 0 var(--about-gap);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  border-radius: clamp(24px, 4vw, 44px);
  background: var(--night);
}

.page-about .about-deep .section-title {
  color: var(--cream);
}

.page-about .pledge {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .pledge__item {
  display: grid;
  gap: .55rem;
  align-content: start;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(244, 239, 230, .22);
}

.page-about .pledge__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .pledge__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: .01em;
  color: var(--cream);
}

.page-about .pledge__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: rgba(244, 239, 230, .78);
}

@media (min-width: 56rem) {
  .page-about .pledge {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.5rem, 4vw, 3rem);
  }
}

/* ===== 收束块 ===== */
.page-about .about-cta {
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-cta__inner {
  padding: clamp(2rem, 5vw, 3.5rem);
  border-radius: clamp(20px, 3vw, 32px);
  background: linear-gradient(140deg, var(--brand) 0%, var(--night) 100%);
}

.page-about .about-cta__eyebrow {
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: .5rem 0 .9rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1.1;
  color: var(--cream);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(244, 239, 230, .82);
}

.page-about .about-cta__actions {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-cta__actions .btn--ghost {
  color: var(--cream);
  border-color: rgba(244, 239, 230, .45);
}

.page-about .about-cta__actions .btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-cta__note {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  font-size: .875rem;
  line-height: 1.7;
  color: rgba(244, 239, 230, .7);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: .18em;
}

/* ===== 窄屏兜底 ===== */
@media (max-width: 30rem) {
  .page-about .timeline {
    padding-left: 1.4rem;
  }

  .page-about .timeline__item::before {
    left: -1.125rem;
  }

  .page-about .timeline__summary {
    flex-wrap: wrap;
    gap: .5rem;
  }

  .page-about .timeline__title {
    font-size: .9375rem;
  }

  .page-about .about-footnote {
    padding-left: 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
}