.page-about {
  --about-card-line: rgba(243, 239, 228, 0.16);
  background: var(--off-white);
  color: var(--graphite);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 通用区段 ---------- */
.page-about .about-sect {
  padding: clamp(42px, 7vw, 92px) 0;
}

.page-about .about-sect--time {
  background: var(--off-white);
}

.page-about .about-sect--paper {
  background: var(--paper);
}

.page-about .about-sect--ink {
  background: var(--green-700);
  color: var(--off-white);
}

.page-about .about-sect--band {
  background: var(--ink-800);
  color: var(--off-white);
}

.page-about .about-sect--end {
  background: var(--ink-900);
  color: var(--off-white);
}

.page-about .about-head {
  max-width: 720px;
  margin: 0 0 clamp(24px, 4vw, 44px);
}

.page-about .about-head--tight {
  margin-bottom: 0;
}

.page-about .about-head__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--track-deep);
}

.page-about .about-sect--ink .about-head__kicker,
.page-about .about-sect--band .about-head__kicker {
  color: var(--signal);
}

.page-about .about-head h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.2vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--graphite);
}

.page-about .about-sect--ink .about-head h2,
.page-about .about-sect--band .about-head h2 {
  color: var(--paper);
}

.page-about .about-head p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-sect--ink .about-head p,
.page-about .about-sect--band .about-head p {
  color: rgba(243, 239, 228, 0.78);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--off-white);
  padding: clamp(20px, 3.5vw, 36px) 0 clamp(38px, 6vw, 78px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -16%;
  bottom: -58%;
  width: min(680px, 82vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(71, 240, 197, 0.2), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 4vw, 40px);
  font-size: 13px;
  color: rgba(243, 239, 228, 0.6);
}

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

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--signal);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(243, 239, 228, 0.82);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 14px;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 10px;
  border-top: 2px solid var(--track-red);
}

.page-about .about-hero__stats .mono {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stats em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(243, 239, 228, 0.64);
}

.page-about .about-hero__fig {
  margin: 0;
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
  box-shadow: 0 34px 64px -46px rgba(0, 0, 0, 0.95);
}

.page-about .about-hero__fig figcaption {
  margin-top: 12px;
  padding-left: 10px;
  border-left: 2px solid var(--track-red);
  font-size: 12.5px;
  line-height: 1.62;
  color: rgba(243, 239, 228, 0.6);
}

/* ---------- 年份轨道 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: var(--sand);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--paper);
  border: 2px solid var(--track-red);
  transform: rotate(45deg);
  box-sizing: border-box;
}

.page-about .tl__details {
  background: var(--paper);
  border: 1px solid var(--sand);
  border-radius: var(--radius-m);
  padding: 4px 16px 6px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .tl__details:hover {
  border-color: var(--cyan-dark);
}

.page-about .tl__details[open] {
  border-color: var(--sand);
  box-shadow: var(--shadow-1);
}

.page-about .tl__summary {
  position: relative;
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 14px 26px 14px 0;
  list-style: none;
  cursor: pointer;
}

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

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

.page-about .tl__summary::after {
  content: "";
  position: absolute;
  right: 4px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--steel);
  border-bottom: 2px solid var(--steel);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.2s var(--ease);
}

.page-about .tl__details[open] .tl__summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

.page-about .tl__summary:focus-visible {
  outline: 3px solid var(--cyan-dark);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--track-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__details[open] .tl__year {
  color: var(--track-red);
}

.page-about .tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16.5px, 2vw, 21px);
  line-height: 1.34;
  color: var(--graphite);
}

.page-about .tl__body {
  display: grid;
  gap: 10px;
  padding: 2px 0 16px;
}

.page-about .tl__body p {
  margin: 0;
  max-width: 46rem;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  max-width: 46rem;
}

.page-about .tl__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--steel);
}

.page-about .tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 2px;
  background: var(--track-red);
}

/* ---------- 团队 ---------- */
.page-about .about-team__fig {
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .team-card {
  background: rgba(243, 239, 228, 0.06);
  border: 1px solid var(--about-card-line);
  border-radius: var(--radius-m);
  padding: 18px 16px 20px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--signal);
  background: rgba(71, 240, 197, 0.09);
  transform: translateY(-2px);
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 600;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card__num span {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: rgba(243, 239, 228, 0.6);
}

.page-about .team-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17.5px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: rgba(243, 239, 228, 0.74);
}

/* ---------- 流程 ---------- */
.page-about .flow-scroll {
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  min-width: 660px;
  height: auto;
}

.page-about .flow-svg rect {
  fill: var(--off-white);
  stroke: var(--sand);
  stroke-width: 2;
}

.page-about .flow-svg text {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  fill: var(--graphite);
}

.page-about .flow-svg .sub {
  font-size: 12.5px;
  font-weight: 400;
  fill: var(--steel);
}

.page-about .flow-svg .flow-node--hot rect {
  fill: var(--ink-900);
  stroke: var(--ink-900);
}

.page-about .flow-svg .flow-node--hot text {
  fill: var(--signal);
}

.page-about .flow-svg .flow-node--hot .sub {
  fill: rgba(243, 239, 228, 0.72);
}

.page-about .flow-svg .flow-arrow {
  fill: none;
  stroke: var(--track-red);
  stroke-width: 2;
  stroke-dasharray: 7 5;
}

.page-about .pace-grid {
  display: grid;
  gap: 12px;
}

.page-about .pace {
  background: var(--off-white);
  border: 1px solid var(--sand);
  border-left: 4px solid var(--track-red);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  padding: 18px 18px 20px;
}

.page-about .pace__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 600;
  color: var(--track-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .pace h3 {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--graphite);
}

.page-about .pace p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--steel);
}

/* ---------- 版图与档案 ---------- */
.page-about .cover-grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .cover-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .cover-stats li {
  padding: 14px 14px 16px;
  background: rgba(243, 239, 228, 0.06);
  border-left: 3px solid var(--track-red);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}

.page-about .cover-stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .cover-stats span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.62;
  color: rgba(243, 239, 228, 0.72);
}

.page-about .cover-fig {
  margin: 0;
}

.page-about .cover-fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-about .cover-fig figcaption {
  margin-top: 12px;
  padding-left: 10px;
  border-left: 2px solid var(--amber);
  font-size: 12.5px;
  line-height: 1.62;
  color: rgba(243, 239, 228, 0.6);
}

.page-about .archive {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-card-line);
}

.page-about .archive li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-card-line);
}

.page-about .archive__tag {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--amber);
}

.page-about .archive__t {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--paper);
}

.page-about .archive__d {
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(243, 239, 228, 0.7);
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 14px;
}

.page-about .partner {
  background: var(--off-white);
  border: 1px solid var(--sand);
  border-bottom: 4px solid var(--green-700);
  border-radius: var(--radius-m);
  padding: 22px 20px 24px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .partner:hover {
  border-bottom-color: var(--track-red);
  transform: translateY(-2px);
}

.page-about .partner__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan-dark);
  font-variant-numeric: tabular-nums;
}

.page-about .partner__num span {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: var(--steel);
}

.page-about .partner h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--graphite);
}

.page-about .partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--steel);
}

.page-about .open-day {
  margin-top: clamp(16px, 3vw, 26px);
  display: grid;
  gap: 12px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink-900);
  border-radius: var(--radius-m);
}

.page-about .open-day__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--signal);
}

.page-about .open-day__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(243, 239, 228, 0.82);
}

.page-about .open-day__link {
  justify-self: start;
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--track-red);
  border-radius: 999px;
  background: var(--track-red);
  color: var(--paper);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .open-day__link:hover,
.page-about .open-day__link:focus-visible {
  background: var(--track-deep);
  border-color: var(--track-deep);
}

/* ---------- 收束 ---------- */
.page-about .about-end__grid {
  display: grid;
  gap: clamp(20px, 3.5vw, 38px);
}

.page-about .about-end__grid h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-end__grid p {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(243, 239, 228, 0.76);
}

.page-about .about-end__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-end__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid rgba(243, 239, 228, 0.22);
  border-radius: var(--radius-s);
  color: var(--paper);
  font-size: 15px;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-end__links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--signal);
}

.page-about .about-end__links a:hover,
.page-about .about-end__links a:focus-visible {
  border-color: var(--signal);
  background: rgba(71, 240, 197, 0.08);
}

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

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

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .archive li {
    grid-template-columns: 104px minmax(0, 0.85fr) minmax(0, 1.9fr);
    align-items: baseline;
    gap: 18px;
  }

  .page-about .open-day {
    grid-template-columns: 112px minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .cover-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

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

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

  .page-about .flow-svg {
    min-width: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: 1.18fr 0.88fr 1.08fr 0.86fr;
    gap: 12px;
  }

  .page-about .tl__item:nth-child(even) {
    margin-left: 5%;
  }

  .page-about .tl__item:nth-child(odd) {
    margin-right: 5%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .partner,
  .page-about .tl__details,
  .page-about .tl__summary::after,
  .page-about .open-day__link,
  .page-about .about-end__links a {
    transition: none;
  }

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