.page-about {
  --about-index-w: 190px;
  --about-rule: clamp(32px, 5vw, 68px);
}

.page-about .about-top {
  padding-top: clamp(88px, 12vw, 132px);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--muted);
  display: flex;
  gap: 8px;
  align-items: center;
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 2px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--green);
  border-color: var(--green);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--text);
}

/* ---------- 首屏 ---------- */

.page-about .story-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(24px, 4vw, 44px);
  overflow: hidden;
}

.page-about .story-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 84% 6%, rgba(107, 255, 158, .09), transparent 44%),
    radial-gradient(circle at 8% 92%, rgba(226, 58, 46, .13), transparent 50%);
}

.page-about .story-hero__inner {
  position: relative;
}

.page-about .story-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 8vw, 86px);
  line-height: .97;
  letter-spacing: .01em;
  color: var(--text);
  margin: 14px 0 0;
  max-width: 14ch;
}

.page-about .story-hero__lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 62ch;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .hero-stat {
  background: var(--ink-900);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .hero-stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .hero-stat__label {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .story-hero__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .story-hero__figure .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .story-hero__figure .media__caption {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  padding: 10px 2px 0;
}

.page-about .story-hero__rail {
  margin-top: clamp(18px, 2.4vw, 28px);
  opacity: .85;
}

.page-about .story-hero__rail svg {
  width: 100%;
  height: 40px;
  display: block;
}

.page-about .story-hero__rail .pulse__base {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .story-hero__rail .pulse__glow {
  fill: none;
  stroke: var(--green-deep);
  stroke-width: 7;
  opacity: .45;
  stroke-linecap: round;
}

.page-about .story-hero__rail .pulse__peak {
  fill: none;
  stroke: var(--green);
  stroke-width: 2;
  stroke-linecap: round;
}

/* ---------- 主体分栏 ---------- */

.page-about .story-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(14px, 2.5vw, 28px) 0 clamp(56px, 8vw, 104px);
}

.page-about .story-index__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 10px;
}

.page-about .story-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .story-index__item {
  flex: 0 0 auto;
}

.page-about .story-index__item a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line-soft);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .story-index__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--dim);
  transition: color 200ms var(--ease);
}

.page-about .story-index__item a:hover,
.page-about .story-index__item a:focus-visible {
  color: var(--text);
  border-color: var(--green);
  background: rgba(107, 255, 158, .06);
}

.page-about .story-index__item a:hover .story-index__year,
.page-about .story-index__item a:focus-visible .story-index__year {
  color: var(--green);
}

/* ---------- 正文区块 ---------- */

.page-about .story-content {
  min-width: 0;
}

.page-about .story-section {
  padding: var(--about-rule) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 140px;
}

.page-about .story-content > .story-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .story-section__head {
  position: relative;
  padding-left: 18px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .story-section__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 6px;
  background: linear-gradient(180deg, var(--red), var(--red-deep));
  clip-path: polygon(0 0, 100% 8px, 100% 100%, 0 calc(100% - 8px));
}

.page-about .story-section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.06;
  letter-spacing: .015em;
  color: var(--text);
  margin: 8px 0 0;
  max-width: 22ch;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .story-text {
  font-size: 17px;
  line-height: 1.78;
  color: var(--text);
  max-width: 66ch;
  margin: 0 0 16px;
}

.page-about .story-text:last-child {
  margin-bottom: 0;
}

.page-about .pull-quote {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 18px 20px 18px 22px;
  background: var(--ink-800);
  border-left: 3px solid var(--green);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .pull-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.4;
  color: var(--text);
  max-width: 30ch;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--red), var(--green-deep) 45%, var(--line));
  opacity: .7;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 34px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--ink-700);
  border: 2px solid var(--green);
  clip-path: polygon(0 4px, 4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--green);
  margin: 0 0 6px;
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.25;
  color: var(--text);
  margin: 0 0 8px;
}

.page-about .timeline__item .story-text {
  margin-bottom: 0;
  font-size: 16px;
}

/* ---------- 大号数字 ---------- */

.page-about .bignum {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 20px 0 0;
  border-top: 1px dashed var(--line-soft);
}

.page-about .bignum__value {
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 72px);
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--amber);
}

.page-about .bignum__unit {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  color: var(--text);
}

.page-about .bignum__note {
  flex: 1 1 220px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .flow__item {
  background: var(--ink-900);
  padding: 18px 18px 20px;
  position: relative;
}

.page-about .flow__item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 38px;
  height: 2px;
  background: var(--red);
  opacity: .8;
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber);
  display: block;
  margin-bottom: 8px;
}

.page-about .flow__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  color: var(--text);
  margin: 0 0 8px;
}

.page-about .flow__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

/* ---------- 团队 ---------- */

.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .team-layout__figure {
  margin: 0;
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .team-layout__figure .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .team-layout__figure .media__caption {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  padding: 10px 2px 0;
}

.page-about .chips {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 6px 12px;
  border: 1px solid currentColor;
  clip-path: polygon(0 6px, 6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.page-about .tag--red {
  color: var(--red);
}

.page-about .tag--green {
  color: var(--green);
}

.page-about .tag--amber {
  color: var(--amber);
}

/* ---------- 视觉来处 ---------- */

.page-about #visual .media {
  margin: clamp(22px, 3vw, 34px) 0 0;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about #visual .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about #visual .media__caption {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  padding: 10px 2px 0;
}

/* ---------- 折叠面板 ---------- */

.page-about .accordion {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .accordion__item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: transparent;
  border: 0;
  padding: 18px 4px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  letter-spacing: .015em;
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .accordion__trigger:hover,
.page-about .accordion__trigger:focus-visible {
  color: var(--green);
  background: rgba(107, 255, 158, .05);
  outline: none;
}

.page-about .accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line);
  clip-path: polygon(0 5px, 5px 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .accordion__icon::before,
.page-about .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: transform 240ms var(--ease), background-color 200ms var(--ease), opacity 200ms var(--ease);
}

.page-about .accordion__icon::before {
  left: 4px;
  right: 4px;
  top: 8px;
  height: 1px;
}

.page-about .accordion__icon::after {
  top: 4px;
  bottom: 4px;
  left: 8px;
  width: 1px;
}

.page-about .accordion__trigger[aria-expanded="true"] {
  color: var(--green);
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__icon {
  border-color: var(--green);
  background: rgba(107, 255, 158, .1);
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__icon::before {
  background: var(--green);
}

.page-about .accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .accordion__panel {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 280ms var(--ease), opacity 240ms var(--ease);
  opacity: 1;
}

.page-about .accordion__panel[data-open="false"] {
  grid-template-rows: 0fr;
  opacity: 0;
}

.page-about .accordion__panel-inner {
  overflow: hidden;
}

.page-about .accordion__panel-inner .story-text {
  font-size: 16px;
  color: var(--muted);
  padding: 0 4px 20px;
  margin: 0;
}

/* ---------- 收尾 ---------- */

.page-about .story-cta {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-800);
  border-left: 3px solid var(--red);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .story-cta__text {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 52ch;
}

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

/* ---------- 显现动效 ---------- */

.page-about .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

.page-about .reveal--2 {
  transform: translateY(12px);
}

.page-about .reveal--3 {
  transform: translateY(8px);
}

.page-about .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */

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

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: clamp(28px, 4vw, 52px);
  }

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

@media (min-width: 980px) {
  .page-about .story-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .story-index {
    position: sticky;
    top: 128px;
  }

  .page-about .story-index__list {
    display: block;
    overflow: visible;
  }

  .page-about .story-index__item a {
    padding: 9px 0;
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    background: transparent;
    white-space: normal;
  }

  .page-about .story-index__item a:hover,
  .page-about .story-index__item a:focus-visible {
    background: transparent;
    color: var(--text);
    border-bottom-color: var(--green);
  }

  .page-about .hero-stats {
    max-width: 760px;
  }

  .page-about .story-section {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .page-about .story-section__body {
    padding-right: clamp(0px, 3vw, 48px);
  }
}

@media (max-width: 560px) {
  .page-about .hero-stats {
    grid-template-columns: 1fr;
    gap: 1px;
  }

  .page-about .hero-stat {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
  }

  .page-about .hero-stat__value {
    font-size: 30px;
  }

  .page-about .story-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .accordion__panel {
    transition: none;
  }
}