.page-about {
  --about-gap: clamp(20px, 3.4vw, 40px);
  position: relative;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about p {
  margin: 0 0 0.9em;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 52px) 0 clamp(30px, 4.6vw, 62px);
  background:
    radial-gradient(120% 92% at 88% -12%, rgba(53, 242, 224, 0.16), transparent 58%),
    radial-gradient(90% 76% at 4% 112%, rgba(123, 97, 255, 0.15), transparent 62%),
    linear-gradient(180deg, #0a1828 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(28, 53, 80, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 53, 80, 0.32) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 82%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  background: linear-gradient(120deg, rgba(255, 122, 47, 0.2), transparent 70%);
  transform: rotate(18deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-hero__crumbs {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-about .about-hero__crumbs a {
  color: var(--mute);
  text-decoration: none;
}

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

.page-about .about-hero__sep {
  padding: 0 6px;
  color: var(--line);
}

.page-about .about-hero__kicker {
  display: inline-block;
  color: var(--cyan);
  letter-spacing: 0.18em;
  margin: 0 0 6px;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0.2em 0 0.36em;
  color: var(--paper);
  text-shadow: 0 0 38px rgba(53, 242, 224, 0.16);
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.72;
  color: rgba(242, 247, 250, 0.86);
  max-width: 60ch;
}

.page-about .about-hero__lead--sub {
  color: rgba(140, 163, 184, 0.96);
  font-size: 15px;
  margin-top: 10px;
}

.page-about .about-stats {
  list-style: none;
  margin: 1.4em 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  background: rgba(9, 22, 37, 0.9);
  padding: 12px 14px;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 23px);
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stats__cap {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--mute);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 8;
  object-fit: cover;
  filter: saturate(0.95) contrast(1.06);
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(180deg, rgba(7, 17, 31, 0.24) 0 1px, transparent 1px 4px);
  pointer-events: none;
}

.page-about .about-hero__visual-cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--cyan);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: clamp(30px, 4.6vw, 68px) 0 clamp(40px, 6vw, 84px);
}

.page-about .about-shell {
  display: grid;
  gap: clamp(22px, 3.6vw, 46px);
}

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

.page-about .about-index__title {
  margin: 0 0 10px;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .about-index__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--mute);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(53, 242, 224, 0.07);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(53, 242, 224, 0.09);
}

.page-about .about-index__link[aria-current="true"] .about-index__num {
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(24px, 3.8vw, 44px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-section__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-section__no {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 29px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-section__lead {
  font-size: clamp(15px, 1.5vw, 17px);
  color: rgba(242, 247, 250, 0.9);
  border-left: 2px solid rgba(53, 242, 224, 0.55);
  padding-left: 14px;
  margin-bottom: 16px;
}

.page-about .about-section > p {
  color: rgba(242, 247, 250, 0.78);
  max-width: 68ch;
}

/* 高亮条 */
.page-about .about-highlight {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(115deg, rgba(53, 242, 224, 0.1), rgba(12, 27, 46, 0.9) 62%);
}

.page-about .about-highlight__label {
  color: var(--cyan);
  display: block;
  margin-bottom: 6px;
}

.page-about .about-highlight__text {
  margin: 0;
  color: var(--paper);
  font-size: 15px;
}

/* 流程步骤 */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 15px 16px;
  background: linear-gradient(180deg, rgba(12, 27, 46, 0.95), rgba(9, 22, 37, 0.95));
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .about-step__title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14.5px;
  color: rgba(242, 247, 250, 0.76);
}

/* 配图 */
.page-about .about-media {
  margin: 20px 0 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-media figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 48%, var(--orange));
  opacity: 0.55;
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 24px 34px;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 224, 0.1);
}

.page-about .about-tl:nth-child(2)::before {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(123, 97, 255, 0.12);
}

.page-about .about-tl:nth-child(3)::before {
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(61, 220, 132, 0.12);
}

.page-about .about-tl:nth-child(4)::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.14);
}

.page-about .about-tl__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-tl__title {
  margin: 3px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 14.5px;
  color: rgba(242, 247, 250, 0.76);
}

.page-about .about-tl__meta {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 10px;
}

.page-about .about-team__item {
  border: 1px solid var(--line);
  background: rgba(12, 27, 46, 0.72);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-team__item[open] {
  border-color: rgba(53, 242, 224, 0.42);
  background: rgba(12, 27, 46, 0.96);
}

.page-about .about-team__sum {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .about-team__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .about-team__item[open] .about-team__sum::after {
  content: "–";
}

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

.page-about .about-team__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--mute);
  border: 1px solid var(--line);
  padding: 2px 7px;
}

.page-about .about-team__role {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.page-about .about-team__body {
  padding: 0 16px 16px;
  font-size: 14.5px;
  color: rgba(242, 247, 250, 0.78);
}

.page-about .about-team__note {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--violet);
  font-size: 13.5px;
  color: var(--mute);
}

/* 合作生态 */
.page-about .about-eco {
  display: grid;
  gap: 14px;
  margin-top: 6px;
}

.page-about .about-eco__hub {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 13px 16px;
  border: 1px solid rgba(53, 242, 224, 0.38);
  background: linear-gradient(115deg, rgba(53, 242, 224, 0.12), rgba(123, 97, 255, 0.1));
  font-size: 14.5px;
  color: rgba(242, 247, 250, 0.9);
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-eco__node {
  position: relative;
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  background: rgba(9, 22, 37, 0.86);
}

.page-about .about-eco__node::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--node, var(--cyan));
}

.page-about .about-eco__node:nth-child(1) {
  --node: var(--cyan);
}

.page-about .about-eco__node:nth-child(2) {
  --node: var(--violet);
}

.page-about .about-eco__node:nth-child(3) {
  --node: var(--orange);
}

.page-about .about-eco__node-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-eco__node-text {
  margin: 0;
  font-size: 14px;
  color: rgba(242, 247, 250, 0.76);
}

.page-about .about-eco__extra {
  margin-top: 16px;
  color: rgba(242, 247, 250, 0.78);
  font-size: 15px;
}

/* 覆盖与规模 */
.page-about .about-reach {
  display: grid;
  gap: 18px;
}

.page-about .about-reach__figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-figure {
  border: 1px solid var(--line);
  background: rgba(12, 27, 46, 0.82);
  padding: 14px;
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--mute);
}

.page-about .about-reach__text {
  font-size: 15px;
  color: rgba(242, 247, 250, 0.78);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 224, 0.4);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

/* 收尾行动区 */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(26px, 4vw, 50px);
  padding: clamp(20px, 3.4vw, 34px);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(12, 27, 46, 0.97), rgba(7, 17, 31, 0.97));
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 47, 0.24), transparent 70%);
  pointer-events: none;
}

.page-about .about-cta h2 {
  position: relative;
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 26px);
  color: var(--paper);
}

.page-about .about-cta p {
  position: relative;
  max-width: 62ch;
  color: rgba(242, 247, 250, 0.78);
  font-size: 15px;
}

.page-about .about-cta__links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .about-top {
  position: relative;
  display: inline-block;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 2px;
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-eco__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-reach {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 88px;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 0 9px 14px;
    font-size: 14px;
    white-space: normal;
    border-radius: 0;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: rgba(53, 242, 224, 0.06);
    border-left-color: var(--cyan);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }

  .page-about .about-index__link[aria-current="true"] {
    border-left-color: var(--cyan);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-team__item {
    transition: none;
  }
}