.page-about {
  --about-rail-w: 212px;
  --about-line: rgba(122, 92, 255, 0.28);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 20px;
  padding: clamp(30px, 5vw, 58px) 0 clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--stroke-soft);
  background:
    radial-gradient(120% 160% at 88% -20%, rgba(122, 92, 255, 0.3), transparent 58%),
    radial-gradient(90% 130% at 2% 120%, rgba(53, 230, 208, 0.13), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(122, 92, 255, 0.65) 28%, rgba(53, 230, 208, 0.6) 72%, transparent);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.2vw, 60px);
  line-height: 1.12;
  letter-spacing: 0.03em;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin-top: clamp(28px, 4vw, 42px);
  padding-top: 24px;
  border-top: 1px solid var(--stroke-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--about-line);
}

.page-about .about-stat__n {
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat__l {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  padding-top: clamp(34px, 5vw, 58px);
  padding-bottom: clamp(50px, 7vw, 92px);
}

/* ---------- 左侧刻度轴 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__head {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--text-dim);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail__link {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--stroke-soft);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-dim);
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(53, 230, 208, 0.06);
}

.page-about .about-rail__num {
  font-size: 12px;
  color: var(--purple);
}

.page-about .about-rail__link:hover .about-rail__num {
  color: var(--cyan);
}

/* ---------- 章节公共 ---------- */
.page-about .about-section {
  padding-bottom: clamp(50px, 7vw, 88px);
}

.page-about .about-section + .about-section {
  padding-top: clamp(40px, 6vw, 68px);
  border-top: 1px solid var(--stroke-soft);
}

.page-about .about-section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 16px;
  align-items: start;
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .about-index {
  font-family: var(--font-display);
  font-size: clamp(46px, 7.4vw, 88px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: 0.02em;
  color: transparent;
  background: linear-gradient(180deg, var(--purple), rgba(53, 230, 208, 0.55));
  -webkit-background-clip: text;
  background-clip: text;
}

.page-about .about-section__titles {
  padding-top: 6px;
}

.page-about .about-section__titles .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.1vw, 34px);
  line-height: 1.24;
  letter-spacing: 0.03em;
}

.page-about .about-section__intro {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-section__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-prose p {
  margin: 0 0 16px;
}

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

/* ---------- 01 定位 ---------- */
.page-about .about-focus {
  border-radius: var(--radius);
  padding: 22px;
}

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

.page-about .about-focus__item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-about .about-focus__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  font-size: 12px;
  color: var(--cyan);
  background: rgba(53, 230, 208, 0.1);
  border: 1px solid rgba(53, 230, 208, 0.3);
}

.page-about .about-focus__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline-figure {
  margin: 0 0 clamp(26px, 4vw, 38px);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--purple), var(--cyan) 62%, rgba(53, 230, 208, 0));
  opacity: 0.5;
}

.page-about .about-tl-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
}

.page-about .about-tl-node {
  display: block;
  width: var(--n, 16px);
  height: var(--n, 16px);
  margin: 20px auto 0;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, #ffffff, var(--purple) 52%, rgba(122, 92, 255, 0.2) 80%);
  box-shadow: 0 0 0 4px rgba(122, 92, 255, 0.12), 0 0 20px rgba(122, 92, 255, 0.55);
}

.page-about .about-tl-item--1 { --n: 13px; }
.page-about .about-tl-item--2 { --n: 19px; }
.page-about .about-tl-item--3 { --n: 25px; }
.page-about .about-tl-item--4 { --n: 32px; }

.page-about .about-tl-item--4 .about-tl-node {
  background: radial-gradient(circle at 34% 34%, #ffffff, var(--cyan) 52%, rgba(53, 230, 208, 0.2) 80%);
  box-shadow: 0 0 0 5px rgba(53, 230, 208, 0.12), 0 0 24px rgba(53, 230, 208, 0.6);
}

.page-about .about-tl-card {
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 24px);
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.055), rgba(11, 16, 38, 0.75));
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-tl-item--3 .about-tl-card,
.page-about .about-tl-item--4 .about-tl-card {
  border-color: var(--stroke);
}

.page-about .about-tl-item--4 .about-tl-card {
  background: linear-gradient(165deg, rgba(122, 92, 255, 0.22), rgba(11, 16, 38, 0.88));
}

.page-about .about-tl-card:hover {
  transform: translateY(-2px);
}

.page-about .about-tl-meta {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-tl-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.3vw, 24px);
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.page-about .about-tl-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-tl-card p.about-tl-meta {
  color: var(--cyan);
}

/* ---------- 03 团队 ---------- */
.page-about .about-section__grid--team {
  align-items: start;
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-team__item {
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--ink-800);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-team__item--a {
  background: linear-gradient(155deg, rgba(122, 92, 255, 0.26), rgba(11, 16, 38, 0.92));
}

.page-about .about-team__item--b {
  background: linear-gradient(155deg, rgba(122, 92, 255, 0.14), rgba(11, 16, 38, 0.92));
}

.page-about .about-team__item--c {
  background: linear-gradient(155deg, rgba(53, 230, 208, 0.16), rgba(11, 16, 38, 0.92));
}

.page-about .about-team__item--d {
  background: linear-gradient(155deg, rgba(255, 61, 154, 0.14), rgba(11, 16, 38, 0.92));
}

.page-about .about-team__item:hover,
.page-about .about-team__item:focus-within {
  transform: translateY(-3px);
  border-color: var(--stroke);
  box-shadow: 0 18px 40px -24px rgba(122, 92, 255, 0.75);
}

.page-about .about-team__num {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 25px);
  letter-spacing: 0.03em;
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 04 收录流程 ---------- */
.page-about .about-process-figure {
  margin: 0 0 clamp(24px, 3.5vw, 34px);
}

.page-about .about-steps {
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.045), rgba(11, 16, 38, 0.78));
  overflow: hidden;
  transition: border-color 0.26s var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--stroke);
}

.page-about .about-step__btn {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  gap: 14px;
  align-items: center;
  width: 100%;
  padding: 18px 20px;
  background: transparent;
  border: 0;
  color: var(--text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-step__idx {
  font-size: 13px;
  color: var(--purple);
}

.page-about .about-step__name {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: 0.03em;
}

.page-about .about-step__hint {
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .about-step .disclosure__icon {
  color: var(--cyan);
}

.page-about .about-step__panel {
  padding: 0 20px 20px 20px;
}

.page-about .about-step__panel p {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-dim);
  border-left: 2px solid rgba(53, 230, 208, 0.45);
  padding-left: 14px;
}

.page-about .about-process__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-process__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 208, 0.4);
}

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

/* ---------- 05 生态 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--ink-800);
  border-top: 2px solid var(--role-accent, var(--purple));
}

.page-about .about-role--supply {
  --role-accent: rgba(122, 92, 255, 0.85);
  background: linear-gradient(180deg, rgba(122, 92, 255, 0.2), rgba(11, 16, 38, 0.92));
}

.page-about .about-role--tech {
  --role-accent: rgba(122, 92, 255, 0.5);
  background: linear-gradient(180deg, rgba(122, 92, 255, 0.09), rgba(11, 16, 38, 0.92));
}

.page-about .about-role--pay {
  --role-accent: rgba(53, 230, 208, 0.75);
  background: linear-gradient(180deg, rgba(53, 230, 208, 0.14), rgba(11, 16, 38, 0.92));
}

.page-about .about-role--care {
  --role-accent: rgba(255, 61, 154, 0.7);
  background: linear-gradient(180deg, rgba(255, 61, 154, 0.13), rgba(11, 16, 38, 0.92));
}

.page-about .about-role__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .about-role__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.3vw, 24px);
  letter-spacing: 0.03em;
}

.page-about .about-role p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-value {
  margin-top: clamp(24px, 3.5vw, 36px);
  border-radius: var(--radius);
  padding: clamp(22px, 3vw, 32px);
}

.page-about .about-value__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-value__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-value__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(53, 230, 208, 0.7);
}

.page-about .about-value__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-next {
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: 22px;
  border-top: 1px solid var(--stroke-soft);
}

.page-about .about-next__lead {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__list a {
  display: block;
  padding: 13px 16px;
  border: 1px solid var(--stroke-soft);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--stroke);
  background: rgba(53, 230, 208, 0.06);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-section__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .about-section__grid--team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 28px;
    align-items: center;
  }

  .page-about .about-team {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-team__item--a { grid-column: span 7; }
  .page-about .about-team__item--b { grid-column: span 5; }
  .page-about .about-team__item--c { grid-column: span 5; }
  .page-about .about-team__item--d { grid-column: span 7; }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 4vw, 58px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
  }

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

@media (max-width: 639px) {
  .page-about .about-step__btn {
    grid-template-columns: auto minmax(0, 1fr) auto;
    row-gap: 6px;
    padding: 16px;
  }

  .page-about .about-step__hint {
    grid-column: 2 / 4;
  }

  .page-about .about-tl-item {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-timeline::before {
    left: 14px;
  }

  .page-about .about-tl-node {
    margin-top: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-card,
  .page-about .about-team__item,
  .page-about .about-rail__link,
  .page-about .about-next__list a {
    transition: none;
  }

  .page-about .about-tl-card:hover,
  .page-about .about-team__item:hover,
  .page-about .about-team__item:focus-within {
    transform: none;
  }
}