.page-about {
  --about-rail: 132px;
  --about-pad: 20px;
  background: var(--rock);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--about-pad);
  padding-right: var(--about-pad);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 112px 0 52px;
  color: var(--rock);
  background:
    radial-gradient(120% 100% at 88% -12%, rgba(46, 140, 140, 0.30), transparent 58%),
    radial-gradient(95% 88% at -12% 112%, rgba(201, 138, 60, 0.22), transparent 62%),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(201, 138, 60, 0) 72%);
}

.page-about .about-hero__shell {
  display: grid;
  gap: 38px;
}

.page-about .about-hero__intro::before {
  content: "";
  display: block;
  width: 76px;
  height: 3px;
  margin-bottom: 24px;
  border-radius: 2px;
  background: linear-gradient(90deg,
    var(--cyan) 0 25%,
    var(--rock) 25% 50%,
    var(--red) 50% 75%,
    var(--green) 75% 100%);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold-bright);
}

.page-about h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--rock);
}

.page-about h1 em {
  font-style: normal;
  color: var(--gold-bright);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 560px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(233, 237, 242, 0.86);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  border-left: 1px solid var(--line);
  padding-left: 14px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  color: rgba(233, 237, 242, 0.7);
}

/* 首屏窄栏索引 */

.page-about .about-jump {
  align-self: end;
  border: 1px solid var(--line);
  border-radius: var(--radius-cut);
  background: rgba(14, 23, 41, 0.58);
  padding: 16px 16px 8px;
}

.page-about .about-jump__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: rgba(233, 237, 242, 0.55);
}

.page-about .about-jump__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--snow);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.5;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .about-jump__item:last-child {
  border-bottom: 0;
}

.page-about .about-jump__item:hover,
.page-about .about-jump__item:focus-visible {
  color: var(--gold-bright);
  padding-left: 6px;
  outline: none;
}

.page-about .about-jump__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--gold);
  letter-spacing: 0.06em;
}

/* ---------- 通栏图 ---------- */

.page-about .about-banner {
  margin: 0;
  line-height: 0;
  background: var(--ink-deep);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  object-fit: cover;
  opacity: 0.92;
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section--snow {
  background: var(--snow);
}

.page-about .about-section--ink {
  background: var(--ink);
  color: var(--rock);
}

.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 26px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-section--ink .about-head {
  border-bottom-color: var(--line);
}

.page-about .about-head__no {
  flex: none;
  padding-top: 7px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 4.4vw, 33px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-prose {
  max-width: 700px;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-prose p {
  margin: 0 0 18px;
}

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

.page-about .about-prose--ink {
  color: rgba(233, 237, 242, 0.85);
  margin-bottom: 30px;
}

.page-about .about-em {
  color: var(--ink);
  box-shadow: inset 0 -0.6em 0 rgba(201, 138, 60, 0.26);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.06em;
  color: var(--red);
}

.page-about .about-num--light {
  color: var(--gold-bright);
}

/* ---------- 时间线 ---------- */

.page-about .about-figure {
  margin: 0 0 34px;
  border-radius: var(--radius-cut);
  overflow: hidden;
  background: var(--snow);
  border-top: 2px solid var(--gold);
  line-height: 0;
}

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

.page-about .about-figure--archive {
  margin: 26px 0 30px;
  border-top-color: var(--cyan);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(22, 35, 63, 0.18) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 34px;
}

.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--snow);
}

.page-about .about-tl__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-tl__ver {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--gold);
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-tl__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17.5px;
  line-height: 1.45;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--gray);
}

/* ---------- 对照条 ---------- */

.page-about .about-compare {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-cut);
  background: var(--rock);
  overflow: hidden;
}

.page-about .about-compare__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--snow);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-compare__hint {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--gray);
}

.page-about .about-compare__switch {
  display: flex;
  gap: 8px;
}

.page-about .about-switch {
  appearance: none;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1;
  padding: 8px 16px;
  cursor: pointer;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-switch:hover {
  border-color: var(--gold);
}

.page-about .about-switch[aria-selected="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-deep);
  font-weight: 700;
}

.page-about .about-switch:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-compare__panel {
  padding: 18px 16px;
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-col {
  padding: 16px 16px 18px;
  border-radius: var(--radius-cut);
  border: 1px solid var(--line-dark);
}

.page-about .about-col--past {
  background: var(--snow);
  border-style: dashed;
  border-color: rgba(22, 35, 63, 0.22);
}

.page-about .about-col--now {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--rock);
}

.page-about .about-col__tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-col--now .about-col__tag {
  color: var(--gold-bright);
}

.page-about .about-col h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  line-height: 1.4;
}

.page-about .about-col__row {
  margin: 0;
  padding: 9px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
  border-top: 1px solid rgba(22, 35, 63, 0.12);
}

.page-about .about-col--now .about-col__row {
  color: rgba(233, 237, 242, 0.82);
  border-top-color: var(--line);
}

.page-about .about-stack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-stack__card {
  padding: 16px;
  border-left: 3px solid var(--gray);
  background: var(--snow);
  border-radius: 0 var(--radius-cut) var(--radius-cut) 0;
}

.page-about .about-stack__card--now {
  border-left-color: var(--gold);
  background: var(--ink);
  color: var(--rock);
}

.page-about .about-stack__card h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.45;
}

.page-about .about-stack__ver {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-stack__list {
  margin: 0;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-stack__card--now .about-stack__list {
  color: rgba(233, 237, 242, 0.82);
}

/* ---------- 团队 ---------- */

.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .about-tab {
  appearance: none;
  border: 0;
  border-left: 3px solid transparent;
  border-radius: 0 4px 4px 0;
  background: rgba(233, 237, 242, 0.10);
  color: var(--snow);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14.5px;
  line-height: 1;
  padding: 12px 18px;
  cursor: pointer;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-tab:hover {
  background: rgba(233, 237, 242, 0.18);
}

.page-about .about-tab[aria-selected="true"] {
  background: var(--gold);
  border-left-color: var(--ink-deep);
  color: var(--ink-deep);
}

.page-about .about-tab:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 2px;
}

.page-about .about-tabpanel {
  max-width: 700px;
  padding: 20px 0 4px;
  border-top: 1px solid var(--line);
}

.page-about .about-tabpanel h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--gold-bright);
}

.page-about .about-tabpanel p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(233, 237, 242, 0.84);
}

.page-about .about-tabpanel__meta {
  font-size: 13px;
  color: rgba(233, 237, 242, 0.58);
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-regions {
  margin-top: 40px;
}

.page-about .about-regions__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--rock);
}

.page-about .about-regions__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-cut);
  overflow: hidden;
}

.page-about .about-region {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 15px 16px;
  background: var(--ink-deep);
}

.page-about .about-region__city {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--rock);
}

.page-about .about-region__duty {
  font-size: 13.5px;
  color: rgba(233, 237, 242, 0.66);
}

/* ---------- 资质 ---------- */

.page-about .about-cred {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-cred__item {
  padding: 18px 18px 20px;
  background: var(--rock);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-cut);
  border-top: 3px solid var(--cyan);
}

.page-about .about-cred__badge {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  border-radius: 3px;
  background: var(--cyan);
  color: #ffffff;
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.page-about .about-cred__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  line-height: 1.45;
}

.page-about .about-cred__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 年度目标 ---------- */

.page-about .about-goals {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-goal {
  display: grid;
  gap: 4px;
  padding: 15px 0 15px 16px;
  border-bottom: 1px solid var(--line-dark);
  border-left: 2px solid var(--gold);
}

.page-about .about-goal__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-goal__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
  color: var(--red);
}

.page-about .about-goal__note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  background:
    radial-gradient(100% 120% at 90% 0%, rgba(201, 138, 60, 0.20), transparent 60%),
    var(--ink-deep);
  color: var(--rock);
  padding: 48px 0 54px;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta__text h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 4.4vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 640px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(233, 237, 242, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-compare__panel {
    padding: 22px 20px;
  }
}

@media (min-width: 768px) {
  .page-about {
    --about-pad: 32px;
    --about-rail: 148px;
  }

  .page-about .about-hero {
    padding-top: 146px;
    padding-bottom: 64px;
  }

  .page-about .about-section {
    padding: 76px 0;
  }

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

  .page-about .about-region {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 18px;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }

  .page-about .about-goal {
    grid-template-columns: minmax(0, 1.15fr) 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 24px;
    padding-left: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-tl {
    padding-left: 0;
  }

  .page-about .about-tl::before {
    display: none;
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 48px;
    padding-bottom: 42px;
  }

  .page-about .about-tl__item::before {
    left: calc(var(--about-rail) + 18.5px);
    top: 10px;
  }

  .page-about .about-tl__item::after {
    content: "";
    position: absolute;
    left: calc(var(--about-rail) + 24px);
    top: 22px;
    bottom: 0;
    width: 1px;
    background: rgba(22, 35, 63, 0.18);
  }

  .page-about .about-tl__item:last-child::after {
    display: none;
  }

  .page-about .about-tl__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-right: 24px;
    text-align: right;
    justify-content: flex-start;
    margin-bottom: 0;
  }

  .page-about .about-tl__year {
    font-size: 34px;
  }

  .page-about .about-tl__body h3 {
    font-size: 19px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__shell {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: 56px;
    align-items: end;
  }

  .page-about .about-tl__year {
    font-size: 40px;
  }

  .page-about .about-goal__val {
    font-size: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__item,
  .page-about .about-switch,
  .page-about .about-tab {
    transition: none;
  }
}