.page-about {
  --about-pad: clamp(44px, 6.5vw, 84px);
  position: relative;
  padding-top: var(--header-h);
  background: var(--abyss-900);
  color: var(--paper);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 1em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about a {
  color: inherit;
}

.page-about .text-link {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(90, 169, 255, 0.4);
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .text-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.5vw, 34px) 0 clamp(40px, 6vw, 68px);
  background: linear-gradient(180deg, var(--abyss-800) 0%, var(--abyss-900) 100%);
  border-bottom: 1px solid var(--hair-soft);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--hair-faint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hair-faint) 1px, transparent 1px);
  background-size: 8.3333% 100%, 100% 104px;
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -14%;
  width: 62%;
  height: 130%;
  background: radial-gradient(closest-side, rgba(0, 229, 208, 0.16), transparent 72%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: clamp(22px, 4vw, 38px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--speed) var(--ease);
}

.page-about .breadcrumb-link:hover {
  color: var(--cyan);
}

.page-about .crumb-current {
  color: var(--paper);
}

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

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .sec-num {
  margin-right: 9px;
  color: var(--cyan);
}

.page-about .hero-title {
  margin: 0 0 18px;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.page-about .lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(234, 246, 250, 0.82);
}

.page-about .panel {
  position: relative;
  isolation: isolate;
  border: 1px solid var(--hair);
  background: linear-gradient(170deg, rgba(12, 44, 66, 0.92), rgba(7, 31, 46, 0.98));
}

.page-about .panel::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: 10px;
  left: 10px;
  right: -10px;
  bottom: -10px;
  border: 1px solid var(--hair-soft);
  background: rgba(4, 20, 31, 0.55);
  pointer-events: none;
}

.page-about .exhibit-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .exhibit-tag::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--cyan);
}

.page-about .hero-panel {
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .hero-count {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 16px 0 22px;
}

.page-about .hero-num {
  font-weight: 200;
  font-size: clamp(3.4rem, 9vw, 5.2rem);
  line-height: 0.85;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
}

.page-about .hero-unit {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .crew-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .crew-bars li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 26px;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--mist);
}

.page-about .crew-bar {
  display: block;
  height: 6px;
  background: rgba(22, 64, 90, 0.55);
}

.page-about .crew-bar i {
  display: block;
  height: 100%;
}

.page-about .crew-bars li:nth-child(1) .crew-bar i {
  width: 46%;
  background: var(--cyan);
}

.page-about .crew-bars li:nth-child(2) .crew-bar i {
  width: 23%;
  background: var(--yellow);
}

.page-about .crew-bars li:nth-child(3) .crew-bar i {
  width: 31%;
  background: var(--orange);
}

.page-about .crew-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--paper);
}

.page-about .hero-facts {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--hair-faint);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
}

.page-about .hero-facts .fact {
  min-width: 0;
}

.page-about .hero-facts dt {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .hero-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.4vw, 23px);
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.page-about .hero-facts .fact:nth-child(2) dd {
  color: var(--cyan);
}

.page-about .hero-facts .fact:nth-child(4) dd {
  color: var(--yellow);
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 10px;
  white-space: nowrap;
  font-size: 13px;
  text-decoration: none;
  color: var(--mist);
  border-bottom: 2px solid transparent;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .rail-link:hover {
  color: var(--paper);
}

.page-about .rail-link[aria-current="true"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: rgba(0, 229, 208, 0.06);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  opacity: 0.85;
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-sec {
  padding-top: clamp(34px, 5vw, 56px);
  padding-bottom: clamp(34px, 5vw, 56px);
  border-top: 1px solid var(--hair-faint);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .section-head {
  max-width: 60ch;
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

.page-about .sec-title {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 3.2vw, 2.35rem);
  line-height: 1.1;
}

.page-about .sec-lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(234, 246, 250, 0.78);
}

.page-about .sec-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(234, 246, 250, 0.7);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0 0 clamp(22px, 3.4vw, 32px);
  padding: 8px;
  border: 1px solid var(--hair);
  background: rgba(7, 31, 46, 0.8);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.05);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding: 0 4px 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  position: relative;
}

.page-about .tl-item {
  position: relative;
  padding-left: 24px;
  padding-bottom: 4px;
  border-left: 1px solid var(--hair-soft);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.14);
  transition: background var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--yellow);
  transition: color var(--speed) var(--ease);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
}

.page-about .tl-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(234, 246, 250, 0.72);
}

.page-about .tl-item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 208, 0.16);
}

.page-about .tl-item:hover .tl-year {
  color: var(--cyan);
}

/* ---------- 团队分工 ---------- */

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

.page-about .crew-card {
  --accent: var(--cyan);
  padding: clamp(18px, 2.4vw, 24px);
  margin-bottom: 10px;
}

.page-about .crew-card--design {
  --accent: var(--yellow);
}

.page-about .crew-card--product {
  --accent: var(--orange);
}

.page-about .crew-card .exhibit-tag::before {
  background: var(--accent);
}

.page-about .crew-num {
  margin: 16px 0 4px;
  font-weight: 200;
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.page-about .crew-unit {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .crew-title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
}

.page-about .crew-desc {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(234, 246, 250, 0.72);
}

.page-about .crew-details {
  padding-top: 12px;
  border-top: 1px solid var(--hair-faint);
}

.page-about .crew-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  transition: color var(--speed) var(--ease);
}

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

.page-about .crew-details summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--accent);
}

.page-about .crew-details[open] summary::after {
  content: "–";
}

.page-about .crew-details summary:hover {
  color: var(--paper);
}

.page-about .crew-details ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .crew-details li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(234, 246, 250, 0.72);
}

.page-about .crew-details li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--accent);
}

.page-about .crew-figure {
  margin-top: clamp(22px, 3.4vw, 32px);
  margin-bottom: 0;
}

/* ---------- 数据旅程 ---------- */

.page-about .journey-wrap {
  position: relative;
  margin-top: 4px;
}

.page-about .journey-line {
  display: none;
}

.page-about .journey {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .journey li {
  padding: 16px 16px 18px;
  border: 1px solid var(--hair-soft);
  background: rgba(7, 31, 46, 0.6);
}

.page-about .journey-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--cyan);
  background: var(--abyss-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .journey h3 {
  margin: 14px 0 6px;
  font-size: 14px;
  font-weight: 700;
}

.page-about .journey p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: rgba(234, 246, 250, 0.72);
}

/* ---------- 大湾区 ---------- */

.page-about .gba-grid {
  display: grid;
  gap: 24px;
}

.page-about .gba-grid .about-figure {
  margin-bottom: 0;
}

.page-about .gba-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .gba-list li {
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--hair);
}

.page-about .gba-list li:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .gba-list li:nth-child(3) {
  border-left-color: var(--yellow);
}

.page-about .gba-list li:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .gba-label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .gba-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(234, 246, 250, 0.78);
}

/* ---------- 合作生态 ---------- */

.page-about .eco-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .eco-card {
  padding: 18px 18px 20px;
  margin-bottom: 10px;
}

.page-about .eco-num {
  margin: 0;
  font-weight: 200;
  font-size: clamp(1.9rem, 4.6vw, 2.7rem);
  line-height: 1;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.page-about .eco-card:nth-child(1) .eco-num {
  color: var(--cyan);
}

.page-about .eco-card:nth-child(2) .eco-num {
  color: var(--yellow);
}

.page-about .eco-card:nth-child(3) .eco-num {
  color: var(--orange);
}

.page-about .eco-card:nth-child(4) .eco-num {
  color: var(--link);
}

.page-about .eco-label {
  margin: 12px 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .eco-text {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.72;
  color: rgba(234, 246, 250, 0.7);
}

/* ---------- 合作方向 ---------- */

.page-about .about-sec--cta {
  border-top: 1px solid var(--hair);
}

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

.page-about .cta-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 24px);
  margin-bottom: 10px;
}

.page-about .cta-card h3 {
  margin: 6px 0 0;
  font-size: 16px;
  font-weight: 700;
}

.page-about .cta-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(234, 246, 250, 0.72);
}

.page-about .cta-link {
  align-self: flex-start;
  margin-top: 6px;
  text-decoration: none;
}

.page-about .cta-note {
  margin: clamp(22px, 3.4vw, 30px) 0 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(234, 246, 250, 0.72);
}

/* ---------- 响应式 ---------- */

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

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

@media (min-width: 880px) {
  .page-about .hero-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    padding-top: 42px;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 10px;
    height: 1px;
    background: linear-gradient(90deg, rgba(0, 229, 208, 0.7), rgba(22, 64, 90, 0.9) 45%, rgba(255, 209, 102, 0.8));
  }

  .page-about .tl-item {
    border-left: 0;
    padding-left: 0;
    padding-right: 22px;
    padding-bottom: 0;
  }

  .page-about .tl-item::before {
    left: 0;
    top: -37px;
  }

  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

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

  .page-about .journey li {
    border: 0;
    background: transparent;
    padding: 0 22px 0 0;
  }

  .page-about .journey-line {
    display: block;
    position: absolute;
    left: 0;
    top: 12px;
    width: 100%;
    height: 10px;
  }

  .page-about .gba-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-link {
    padding: 8px 10px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .page-about .rail-link[aria-current="true"] {
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .tl-item::before,
  .page-about .tl-year,
  .page-about .crew-details summary {
    transition: none;
  }
}