.page-about {
  background: var(--ink-950);
  color: var(--white);
  overflow-x: clip;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 42px) 0 clamp(44px, 6vw, 78px);
  background:
    radial-gradient(circle at 84% 8%, rgba(43, 227, 198, 0.16), transparent 44%),
    radial-gradient(circle at 8% 82%, rgba(36, 64, 124, 0.55), transparent 56%),
    var(--ink-950);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.14) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.45;
  pointer-events: none;
  mask-image: linear-gradient(180deg, #000 0%, transparent 82%);
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.2vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.7vw, 16.5px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__lead--sub {
  margin-top: 12px;
  color: rgba(168, 180, 212, 0.78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 32px);
}

.page-about .about-hero__figure {
  margin: 0;
  background: var(--ink-900);
  clip-path: var(--cut);
  border: 1px solid var(--line-soft);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-hero__figure figcaption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px 18px;
  background: var(--ink-900);
}

.page-about .about-hero__stats .stat__value {
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1;
}

.page-about .about-hero__stats .stat__label {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 正文纸面 ---------- */

.page-about .about-body {
  position: relative;
  background: var(--paper);
  color: var(--text-ink);
  padding: clamp(40px, 6vw, 82px) 0 clamp(56px, 8vw, 104px);
}

.page-about .about-body::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    114deg,
    rgba(19, 28, 51, 0.035) 0 1px,
    transparent 1px 28px
  );
  pointer-events: none;
}

.page-about .about-body__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

/* ---------- 年份刻度 ---------- */

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(19, 28, 51, 0.5);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  background: var(--paper-2);
  clip-path: var(--cut-sm);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.28s var(--ease), color 0.28s var(--ease);
}

.page-about .about-rail__year {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink-950);
}

.page-about .about-rail__hint {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(19, 28, 51, 0.55);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--ink-950);
}

.page-about .about-rail__link:hover .about-rail__year,
.page-about .about-rail__link:focus-visible .about-rail__year {
  color: var(--cyan);
}

.page-about .about-rail__link:hover .about-rail__hint,
.page-about .about-rail__link:focus-visible .about-rail__hint {
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */

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

.page-about .about-section {
  position: relative;
  padding-top: clamp(30px, 4vw, 46px);
}

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

.page-about .about-section + .about-section {
  margin-top: clamp(36px, 6vw, 72px);
  border-top: 1px solid rgba(19, 28, 51, 0.14);
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 74px;
  height: 3px;
  background: var(--red);
  transform: skewY(-6deg);
}

.page-about .about-section__eyebrow {
  margin: 0;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(19, 28, 51, 0.48);
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-editorial);
  font-size: clamp(22px, 3.3vw, 31px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--ink-950);
}

.page-about .about-section__lead {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(19, 28, 51, 0.78);
}

.page-about .about-section__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--white);
}

/* ---------- 历程 ---------- */

.page-about .about-era {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--ink-700), rgba(36, 64, 124, 0.08));
}

.page-about .about-era__item {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-era__dot {
  position: absolute;
  left: -26px;
  top: 9px;
  width: 10px;
  height: 10px;
  background: var(--paper);
  border: 2px solid var(--ink-700);
  transform: rotate(45deg);
  transition: border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-era__item:hover .about-era__dot,
.page-about .about-era__item:target .about-era__dot {
  background: var(--cyan);
  border-color: var(--ink-950);
}

.page-about .about-era__title {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  letter-spacing: 0.01em;
  color: var(--ink-950);
}

.page-about .about-era__year {
  display: inline-block;
  padding: 2px 9px 3px;
  background: var(--ink-950);
  clip-path: var(--cut-sm);
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--white);
}

.page-about .about-era__text {
  margin: 8px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(19, 28, 51, 0.78);
}

/* ---------- 团队 ---------- */

.page-about .about-section .filter-bar {
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .filter-btn {
  background: transparent;
  border-color: rgba(19, 28, 51, 0.22);
  color: rgba(19, 28, 51, 0.78);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--ink-950);
  border-color: var(--ink-950);
  color: var(--white);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 22px 24px;
  background: var(--paper-2);
  clip-path: var(--cut);
}

.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink-950);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(19, 28, 51, 0.76);
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-flow__step {
  background: var(--paper-2);
  clip-path: var(--cut-sm);
}

.page-about .about-flow__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-flow__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--ink-700);
}

.page-about .about-flow__step[open] .about-flow__summary::after {
  content: "–";
}

.page-about .about-flow__idx {
  flex: none;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-700);
}

.page-about .about-flow__name {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--ink-950);
}

.page-about .about-flow__time {
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--red);
  white-space: nowrap;
}

.page-about .about-flow__body {
  padding: 2px 20px 20px;
  border-top: 1px solid rgba(19, 28, 51, 0.1);
}

.page-about .about-flow__body p {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(19, 28, 51, 0.78);
}

/* ---------- 栏目标签 ---------- */

.page-about .about-cols {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-cols__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 20px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(19, 28, 51, 0.16);
}

.page-about .about-cols__tag {
  align-self: flex-start;
  padding: 3px 10px 4px;
  font-family: var(--font-label);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-950);
  background: var(--paper-2);
  clip-path: var(--cut-sm);
}

.page-about .about-cols__tag--cyan {
  background: var(--cyan);
}

.page-about .about-cols__tag--red {
  background: var(--red);
  color: var(--white);
}

.page-about .about-cols__tag--yellow {
  background: var(--yellow);
}

.page-about .about-cols__tag--paper {
  background: var(--ink-950);
  color: var(--white);
}

.page-about .about-cols__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.32;
  color: var(--ink-950);
}

.page-about .about-cols__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(19, 28, 51, 0.75);
}

/* ---------- 通用配图 ---------- */

.page-about .about-figure {
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  background: var(--paper-2);
  clip-path: var(--cut);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 12 / 8;
}

.page-about .about-figure figcaption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(19, 28, 51, 0.66);
  border-top: 1px solid rgba(19, 28, 51, 0.12);
}

/* ---------- 深色更新面板 ---------- */

.page-about .about-section--dark {
  margin-top: clamp(36px, 6vw, 72px);
  padding: clamp(26px, 4vw, 44px) clamp(20px, 3.4vw, 40px) clamp(30px, 4vw, 48px);
  background:
    radial-gradient(circle at 88% 0%, rgba(43, 227, 198, 0.14), transparent 52%),
    var(--ink-950);
  clip-path: var(--cut);
  border-top: 0;
}

.page-about .about-section--dark::before {
  display: none;
}

.page-about .about-section--dark .about-section__eyebrow {
  color: var(--cyan);
}

.page-about .about-section--dark .about-section__title {
  color: var(--white);
}

.page-about .about-section--dark .about-section__lead {
  color: var(--muted);
}

.page-about .about-timing {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-timing li {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 20px 20px;
  background: var(--ink-900);
}

.page-about .about-timing__t {
  font-family: var(--font-data);
  font-size: clamp(17px, 2.2vw, 20px);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-timing__d {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 本地社群 ---------- */

.page-about .about-local {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
  margin-top: clamp(22px, 3vw, 30px);
  padding-left: 18px;
  border-left: 3px solid var(--yellow);
}

.page-about .about-local__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(56px, 12vw, 96px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--ink-950);
}

.page-about .about-local__copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(19, 28, 51, 0.78);
}

.page-about .about-local__copy p + p {
  margin-top: 12px;
}

/* ---------- 联系 ---------- */

.page-about .about-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 30px);
  background: rgba(19, 28, 51, 0.14);
  border: 1px solid rgba(19, 28, 51, 0.14);
}

.page-about .about-reach__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
  background: var(--paper);
  min-width: 0;
}

.page-about .about-reach__label {
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(19, 28, 51, 0.5);
}

.page-about .about-reach__text {
  font-family: var(--font-data);
  font-size: 14.5px;
  letter-spacing: 0.02em;
  color: var(--ink-950);
  word-break: break-word;
}

.page-about .about-reach .copy-chip {
  align-self: flex-start;
  max-width: 100%;
  font-family: var(--font-data);
  font-size: 14.5px;
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
}

.page-about .about-reach__note {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(19, 28, 51, 0.72);
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 快捷入口 ---------- */

.page-about .about-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: clamp(40px, 6vw, 72px);
  padding-top: 22px;
  border-top: 1px solid rgba(19, 28, 51, 0.14);
}

.page-about .about-quick__link {
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-quick__link:hover,
.page-about .about-quick__link:focus-visible {
  color: var(--ink-950);
  border-bottom-color: var(--red);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-local__num {
    font-size: clamp(72px, 9vw, 104px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .about-body__inner {
    grid-template-columns: 112px minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding: 12px 14px 12px 16px;
    background: transparent;
    clip-path: none;
    border-left: 2px solid rgba(19, 28, 51, 0.18);
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(19, 28, 51, 0.05);
    border-left-color: var(--ink-950);
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-era__dot,
  .page-about .about-quick__link {
    transition: none;
  }
}