.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .shell {
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-top {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--grid-line);
  padding: clamp(18px, 3vw, 28px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 6% -12%, rgba(46, 158, 146, 0.17), transparent 60%),
    radial-gradient(90% 80% at 100% 0%, rgba(242, 101, 34, 0.13), transparent 58%),
    var(--paper);
}

.page-about .about-top::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(199, 211, 209, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199, 211, 209, 0.55) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.45;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
}

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

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--neutral);
}

.page-about .breadcrumb a {
  color: var(--teal-500);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .breadcrumb-sep {
  margin: 0 8px;
  color: var(--grid-line);
}

.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.6vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 16ch;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.85;
  color: var(--neutral);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 20px;
  background: var(--paper);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1;
  color: var(--navy-900);
}

.page-about .about-fact:first-child .about-fact__num {
  color: var(--orange-500);
  font-size: clamp(2.1rem, 5vw, 2.9rem);
}

.page-about .about-fact__unit {
  font-size: 0.55em;
  margin-left: 2px;
}

.page-about .about-fact__cap {
  font-size: 13px;
  line-height: 1.5;
  color: var(--neutral);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--grid-line);
}

.page-about .about-chapter:first-of-type {
  border-top: 0;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: 18px;
  padding-block: clamp(44px, 7vw, 88px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: flex-start;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: var(--grid-line);
}

.page-about .about-chapter__body h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.24;
  letter-spacing: -0.005em;
  max-width: 22ch;
}

.page-about .label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal-500);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--neutral);
}

.page-about .about-prose p {
  margin: 0 0 18px;
  max-width: 40em;
  line-height: 1.85;
}

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

/* ---------- 01 起点 ---------- */
.page-about .about-split {
  margin-top: 22px;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--navy-700);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--teal-200);
  background: var(--navy-900);
}

.page-about .about-figure--tall {
  margin-top: 26px;
}

.page-about .about-figure--tall img {
  aspect-ratio: 3 / 4;
}

/* ---------- 02 三组轮值 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-crew__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--grid-line);
}

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

.page-about .about-crew__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange-500);
  padding-top: 4px;
}

.page-about .about-crew__txt h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: 0;
}

.page-about .about-crew__txt p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--neutral);
  max-width: 40em;
}

/* ---------- 横向插片 ---------- */
.page-about .about-band {
  background: var(--navy-900);
  padding: clamp(20px, 3vw, 32px) var(--gutter);
}

.page-about .about-band__fig {
  margin: 0 auto;
  max-width: var(--shell-max);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.page-about .about-band__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.page-about .about-band__fig figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--lime-400);
  background: rgba(11, 29, 51, 0.86);
  border-top-right-radius: var(--radius-sm);
}

/* ---------- 03 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: var(--grid-line);
}

.page-about .about-tl {
  position: relative;
  padding-left: 32px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--teal-500);
}

.page-about .about-tl:nth-child(3n)::before {
  border-color: var(--orange-500);
}

.page-about .about-tl__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
}

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

.page-about .about-tl__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--neutral);
}

.page-about .about-tl__item[open] summary::after {
  content: "–";
  color: var(--orange-500);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 1rem;
  color: var(--teal-500);
}

.page-about .about-tl__title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .about-tl__desc {
  margin: 2px 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--orange-100);
  max-width: 38em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--neutral);
}

/* ---------- 04 覆盖（深色面板） ---------- */
.page-about .about-dark {
  position: relative;
  overflow: hidden;
  background: var(--navy-900);
  color: var(--teal-200);
  padding-block: clamp(46px, 7vw, 88px);
}

.page-about .about-dark::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(191, 227, 221, 0.13) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(191, 227, 221, 0.13) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-mask-image: radial-gradient(90% 80% at 80% 0%, #000, transparent 78%);
  mask-image: radial-gradient(90% 80% at 80% 0%, #000, transparent 78%);
}

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

.page-about .about-dark__head {
  display: grid;
  gap: 14px;
}

.page-about .about-dark__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: rgba(191, 227, 221, 0.34);
}

.page-about .about-dark__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.24;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-dark__lead {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(191, 227, 221, 0.85);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: rgba(191, 227, 221, 0.22);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px 22px;
  background: var(--navy-700);
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4.6vw, 2.9rem);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-metric:first-child .about-metric__num {
  color: var(--lime-400);
}

.page-about .about-metric__plus {
  color: var(--orange-500);
  font-size: 0.7em;
}

.page-about .about-metric__cap {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(191, 227, 221, 0.78);
}

.page-about .about-dark__note {
  margin-top: clamp(26px, 4vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 22px;
  align-items: flex-start;
}

.page-about .about-dark__note p {
  margin: 0;
  max-width: 44em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(191, 227, 221, 0.85);
}

/* ---------- 05 团队 ---------- */
.page-about .about-team {
  margin-top: 24px;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team__viz {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.page-about .about-donut {
  position: relative;
  width: 148px;
  height: 148px;
  flex: 0 0 auto;
}

.page-about .about-donut__ring {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: conic-gradient(
    var(--teal-500) 0% 43%,
    var(--orange-500) 43% 79%,
    var(--navy-700) 79% 100%
  );
  -webkit-mask-image: radial-gradient(circle at 50% 50%, transparent 57%, #000 58%);
  mask-image: radial-gradient(circle at 50% 50%, transparent 57%, #000 58%);
}

.page-about .about-donut__core {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.page-about .about-donut__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 2rem;
  line-height: 1;
  color: var(--navy-900);
}

.page-about .about-donut__cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--neutral);
}

.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13.5px;
  color: var(--neutral);
}

.page-about .about-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex: 0 0 auto;
}

.page-about .about-legend__dot--teal {
  background: var(--teal-500);
}

.page-about .about-legend__dot--orange {
  background: var(--orange-500);
}

.page-about .about-legend__dot--navy {
  background: var(--navy-700);
}

.page-about .about-figure--wide {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 8;
}

/* ---------- 06 认可与纠错 ---------- */
.page-about .about-trust {
  margin-top: 24px;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-trust h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
}

.page-about .about-honor {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-honor li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--grid-line);
  font-size: 0.98rem;
  line-height: 1.6;
}

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

.page-about .about-honor__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--orange-500);
  min-width: 46px;
}

.page-about .about-trust__extra {
  margin: 16px 0 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--neutral);
  max-width: 34em;
}

.page-about .about-trust__fix p {
  margin: 0 0 14px;
  max-width: 36em;
  line-height: 1.85;
  color: var(--neutral);
  font-size: 0.98rem;
}

.page-about .about-fixlist {
  margin: 0;
  padding: 0 0 0 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 36em;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-fixlist li::marker {
  font-family: var(--font-mono);
  color: var(--teal-500);
  font-weight: 700;
}

.page-about .about-quote {
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 4px 0 4px 20px;
  border-left: 4px solid var(--orange-500);
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2.3vw, 1.5rem);
  line-height: 1.55;
  color: var(--navy-900);
  max-width: 26em;
}

.page-about .about-next {
  margin-top: clamp(28px, 4vw, 44px);
  padding: 24px 20px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  background: var(--orange-100);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-next p {
  margin: 0;
  max-width: 40em;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--ink);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
  }

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

  .page-about .about-chapter__grid,
  .page-about .about-dark__head {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-chapter__num,
  .page-about .about-dark__num {
    position: sticky;
    top: 92px;
  }

  .page-about .about-split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(24px, 4vw, 48px);
    align-items: start;
  }

  .page-about .about-figure--tall {
    margin-top: 6px;
  }

  .page-about .about-crew__item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-crew__item:nth-child(2) {
    padding-left: 22px;
  }

  .page-about .about-donut {
    width: 176px;
    height: 176px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .page-about .about-team__viz {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .page-about .about-trust {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-next {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-dark__note {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .about-dark__note p {
    max-width: 34em;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero h1 {
    max-width: 14ch;
  }

  .page-about .about-chapter__grid,
  .page-about .about-dark__head {
    grid-template-columns: 168px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}