.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.14;
  letter-spacing: .01em;
  margin: 10px 0 0;
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 7vw, 84px) 0 clamp(56px, 9vw, 116px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 80% 12%, rgba(0, 229, 212, .18), transparent 48%),
    linear-gradient(rgba(169, 186, 203, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 186, 203, .07) 1px, transparent 1px);
  background-size: auto, 56px 56px, 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 86%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(30px, 5vw, 52px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.06;
  letter-spacing: .015em;
  margin: 14px 0 0;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 580px;
  font-size: clamp(16px, 1.6vw, 18px);
  color: rgba(255, 255, 255, .84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__rail {
  border-top: 1px solid rgba(0, 229, 212, .34);
  padding-top: 16px;
}

.page-about .about-hero__railkicker {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

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

.page-about .about-rail__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 10px;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(169, 186, 203, .22);
}

.page-about .about-rail__item:last-child {
  border-bottom: none;
}

.page-about .about-rail__num {
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--white);
}

.page-about .about-rail__unit {
  font-size: 14px;
  color: var(--cyan-soft);
  letter-spacing: .04em;
}

.page-about .about-rail__note {
  flex: 0 0 100%;
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--grid);
  line-height: 1.6;
}

/* ---------- 意义 ---------- */

.page-about .about-why {
  padding: clamp(56px, 9vw, 128px) 0;
  border-top: 1px solid rgba(169, 186, 203, .14);
}

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

.page-about .about-why__h {
  position: relative;
  padding-left: 20px;
}

.page-about .about-why__h::before {
  content: "";
  position: absolute;
  left: 0;
  top: .16em;
  bottom: .16em;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(0, 229, 212, 0));
}

.page-about .about-why__body p {
  margin: 0 0 18px;
  max-width: 46ch;
  color: rgba(255, 255, 255, .84);
  font-size: 16px;
}

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

.page-about .about-why__body p:first-child {
  font-size: clamp(17px, 1.9vw, 20px);
  color: var(--white);
}

/* ---------- 时间轴 ---------- */

.page-about .about-line {
  padding: clamp(56px, 9vw, 120px) 0;
  background: linear-gradient(180deg, rgba(11, 42, 71, .8), rgba(6, 26, 46, 0));
  border-top: 1px solid rgba(0, 229, 212, .18);
}

.page-about .about-line__lede {
  margin: 18px 0 0;
  max-width: 640px;
  font-size: 16px;
  color: rgba(255, 255, 255, .8);
}

.page-about .about-line__figure {
  margin: 32px 0 0;
}

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

.page-about .about-line__track {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-line__track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber), var(--cyan) 50%, rgba(0, 229, 212, .08));
}

.page-about .about-line__node {
  position: relative;
}

.page-about .about-line__item {
  border-bottom: 1px solid rgba(169, 186, 203, .16);
}

.page-about .about-line__sum {
  display: grid;
  grid-template-columns: 62px 1fr 14px;
  align-items: center;
  gap: 12px;
  padding: 18px 0 18px 26px;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .about-line__sum::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 50%;
  width: 13px;
  height: 13px;
  margin-top: -7px;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .about-line__sum::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--cyan-soft);
  border-bottom: 1px solid var(--cyan-soft);
  transform: rotate(45deg);
  transition: transform .25s ease;
  justify-self: end;
}

.page-about .about-line__item[open] > .about-line__sum::after {
  transform: rotate(-135deg);
}

.page-about .about-line__year {
  font-size: 15px;
  color: var(--amber);
  letter-spacing: .06em;
}

.page-about .about-line__title {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 600;
  color: var(--white);
  line-height: 1.5;
}

.page-about .about-line__panel {
  padding: 0 0 22px 26px;
}

.page-about .about-line__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: rgba(255, 255, 255, .78);
}

/* ---------- 流程 ---------- */

.page-about .about-flow {
  padding: clamp(56px, 9vw, 120px) 0;
}

.page-about .about-flow__lede {
  margin: 16px 0 0;
  max-width: 620px;
  font-size: 16px;
  color: rgba(255, 255, 255, .8);
}

.page-about .about-flow__body {
  display: grid;
  gap: 30px;
  margin-top: 34px;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: flow;
}

.page-about .about-flow__steps li {
  counter-increment: flow;
  position: relative;
  padding: 20px 22px 20px 64px;
  background: linear-gradient(135deg, rgba(18, 63, 94, .78), rgba(11, 42, 71, .42));
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
}

.page-about .about-flow__steps li::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 24px;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-flow__steps h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .03em;
  color: var(--white);
}

.page-about .about-flow__steps p {
  margin: 0;
  font-size: 15px;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-flow__figure {
  margin: 0;
}

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

/* ---------- 外援名额 ---------- */

.page-about .about-quota {
  padding: clamp(56px, 9vw, 120px) 0;
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-quota .eyebrow {
  color: var(--ink-3);
}

.page-about .about-quota h2 {
  color: var(--ink);
}

.page-about .about-quota p {
  color: var(--ink-3);
}

.page-about .about-quota__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-quota__lead p {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16px;
}

.page-about .about-quota__scale {
  display: flex;
  height: 46px;
  margin: 28px 0 0;
  border-left: 3px solid var(--orange);
  background: linear-gradient(90deg, rgba(255, 75, 43, .22), rgba(0, 229, 212, .2));
}

.page-about .about-quota__scale span {
  flex: 1 1 0;
  border-right: 1px solid rgba(11, 42, 71, .26);
}

.page-about .about-quota__scale span:last-child {
  border-right: none;
}

.page-about .about-quota__scaleCap {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 14px 0 0;
  font-size: 14px;
}

.page-about .about-quota__scaleCap .num {
  font-size: 22px;
  color: var(--orange);
}

.page-about .about-quota__rules {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(11, 42, 71, .22);
}

.page-about .about-quota__rules li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid rgba(11, 42, 71, .22);
  font-size: 15px;
  color: var(--ink-3);
}

.page-about .about-quota__rules .num {
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--orange);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: clamp(56px, 9vw, 120px) 0;
  background: var(--ink);
}

.page-about .about-team__lede {
  margin: 18px 0 0;
  max-width: 620px;
  font-size: 16px;
  color: rgba(255, 255, 255, .8);
}

.page-about .about-team__cards {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-team__card {
  position: relative;
  padding: 26px 22px 24px;
  background: linear-gradient(155deg, var(--ink-3), var(--ink-2) 64%);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  transition: transform .3s ease;
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 22px;
  top: 0;
  height: 2px;
  background: var(--cyan);
  opacity: .4;
  transition: opacity .3s ease;
}

.page-about .about-team__card:hover {
  transform: translateY(-5px);
}

.page-about .about-team__card:hover::before {
  opacity: 1;
}

.page-about .about-team__role {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: .05em;
  color: var(--white);
}

.page-about .about-team__desc {
  margin: 0 0 20px;
  font-size: 15px;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-team__key {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding-top: 15px;
  border-top: 1px dashed rgba(169, 186, 203, .3);
  font-size: 13.5px;
  color: var(--grid);
}

.page-about .about-team__key .num {
  font-size: 23px;
  color: var(--cyan-soft);
}

/* ---------- 服务对象 ---------- */

.page-about .about-audience {
  padding: clamp(56px, 9vw, 120px) 0;
  background: linear-gradient(180deg, rgba(11, 42, 71, .6), rgba(6, 26, 46, 0));
  border-top: 1px solid rgba(0, 229, 212, .16);
}

.page-about .about-audience__lede {
  margin: 18px 0 0;
  max-width: 640px;
  font-size: 16px;
  color: rgba(255, 255, 255, .8);
}

.page-about .about-audience__body {
  display: grid;
  gap: 30px;
  margin-top: 34px;
}

.page-about .about-audience__figure {
  margin: 0;
}

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

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

.page-about .about-audience__list li {
  position: relative;
  padding: 20px 0 20px 22px;
  border-bottom: 1px solid rgba(169, 186, 203, .18);
}

.page-about .about-audience__list li:last-child {
  border-bottom: none;
}

.page-about .about-audience__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 9px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-audience__list h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--white);
}

.page-about .about-audience__list p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  color: rgba(255, 255, 255, .76);
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  padding: clamp(48px, 7vw, 92px) 0 clamp(64px, 9vw, 120px);
}

.page-about .about-next__inner {
  display: grid;
  gap: 26px;
  padding: clamp(28px, 4vw, 52px);
  background:
    linear-gradient(120deg, rgba(0, 229, 212, .12), rgba(255, 75, 43, .1)),
    var(--ink-2);
  clip-path: polygon(24px 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%, 0 24px);
}

.page-about .about-next__copy h2 {
  margin: 0;
}

.page-about .about-next__copy p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  color: rgba(255, 255, 255, .8);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 媒体查询 ---------- */

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(248px, .72fr);
    gap: clamp(40px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-hero__rail {
    border-top: none;
    border-left: 1px solid rgba(0, 229, 212, .26);
    padding-top: 0;
    padding-left: 26px;
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
    gap: clamp(40px, 6vw, 96px);
    align-items: start;
  }

  .page-about .about-flow__body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-quota__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(280px, .82fr);
    gap: clamp(40px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-audience__body {
    grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
    max-width: 420px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-line__sum {
    grid-template-columns: 78px 1fr 14px;
    padding-left: 30px;
  }

  .page-about .about-line__panel {
    padding-left: 30px;
  }

  .page-about .about-line__track::before {
    left: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-team__card::before,
  .page-about .about-line__sum::after {
    transition: none;
  }

  .page-about .about-team__card:hover {
    transform: none;
  }
}