.page-about {
  --about-rail: 48px;
  --about-grid-gap: 14px;
  --about-pad: 44px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 38px;
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(53, 224, 200, .10) 0%, rgba(7, 19, 15, 0) 62%),
    linear-gradient(180deg, rgba(16, 36, 27, .55) 0%, rgba(7, 19, 15, 0) 100%);
  border-bottom: 1px solid var(--ky-line);
}

.page-about .about-hero__split {
  display: grid;
  gap: 32px;
  margin-top: 22px;
  align-items: center;
}

.page-about .about-hero__title {
  margin: 12px 0 16px;
  font-size: clamp(27px, 7.2vw, 50px);
  line-height: 1.14;
  letter-spacing: -.025em;
  font-weight: 700;
  color: var(--ky-text);
}

.page-about .about-hero__lead .ky-lede {
  max-width: 60ch;
  color: var(--ky-muted);
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 16px;
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--ky-line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-fact__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ky-muted);
  letter-spacing: .02em;
}

.page-about .about-fact__value {
  margin: 0;
  font-size: 18px;
  line-height: 1.2;
  color: var(--ky-text);
  font-weight: 600;
}

.page-about .about-fact__value .ky-num {
  color: var(--ky-yellow);
  font-size: 24px;
  letter-spacing: -.02em;
}

.page-about .about-hero__board {
  max-width: 340px;
  width: 100%;
  margin: 0 auto;
}

.page-about .about-hero__board svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 编号章节 ---------- */
.page-about .about-chapter {
  padding: 42px 0;
  border-bottom: 1px solid var(--ky-line);
  scroll-margin-top: 96px;
}

.page-about .about-chapter--last {
  border-bottom: 0;
  padding-bottom: 64px;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-grid-gap);
  align-items: start;
}

.page-about .about-chapter__rail {
  position: relative;
  padding-top: 6px;
  min-height: 60px;
}

.page-about .about-chapter__no {
  display: block;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -.03em;
  color: rgba(255, 201, 60, .62);
  transition: color .3s var(--ky-ease), text-shadow .3s var(--ky-ease);
}

.page-about .about-chapter.is-visible .about-chapter__no {
  color: var(--ky-yellow);
  text-shadow: 0 0 18px rgba(255, 201, 60, .32);
}

.page-about .about-chapter__rail::after {
  content: "";
  position: absolute;
  left: 0;
  top: 40px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 200, .55) 0%, rgba(53, 224, 200, 0) 92%);
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-size: clamp(20px, 4.4vw, 28px);
  line-height: 1.3;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--ky-text);
}

.page-about .about-chapter__body p {
  margin: 0 0 15px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ky-text);
  opacity: .86;
}

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

.page-about .about-chapter__body strong {
  color: var(--ky-cyan-bright);
  font-weight: 600;
  opacity: 1;
}

.page-about .about-link {
  color: var(--ky-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, .42);
  transition: color .16s var(--ky-ease), border-color .16s var(--ky-ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--ky-cyan-bright);
  border-bottom-color: var(--ky-cyan-bright);
  outline: none;
}

.page-about .about-link:focus-visible {
  box-shadow: 0 0 0 2px rgba(53, 224, 200, .45);
  border-radius: 2px;
}

/* ---------- 来源处理链路 ---------- */
.page-about .about-chain {
  display: grid;
  gap: 0;
  margin: 26px 0 24px;
  border-top: 1px solid var(--ky-line);
}

.page-about .about-chain__step {
  position: relative;
  padding: 18px 0 18px 34px;
  border-bottom: 1px solid var(--ky-line);
}

.page-about .about-chain__step::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 22px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ky-cyan);
}

.page-about .about-chain__step::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 33px;
  bottom: -1px;
  width: 1px;
  background: var(--ky-line);
}

.page-about .about-chain__step:last-child::after {
  display: none;
}

.page-about .about-chain__no {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ky-yellow);
  margin-bottom: 6px;
}

.page-about .about-chain__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ky-text);
  letter-spacing: -.01em;
}

.page-about .about-chain__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ky-muted);
  opacity: 1;
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  margin: 28px 0 0;
}

.page-about .about-media .ky-media {
  position: relative;
  overflow: hidden;
}

.page-about .about-media .ky-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.86) brightness(.82) contrast(1.06);
}

.page-about .about-media .ky-media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ky-muted);
}

.page-about .about-media--square .ky-media {
  max-width: 420px;
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 22px 0 24px;
  padding: 0;
  border-top: 1px solid var(--ky-line);
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--ky-line);
  transition: background-color .16s var(--ky-ease);
}

.page-about .about-roles li:hover {
  background: rgba(53, 224, 200, .045);
}

.page-about .about-roles__count {
  font-family: var(--ky-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--ky-yellow);
  letter-spacing: -.02em;
}

.page-about .about-roles__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ky-text);
  opacity: .86;
}

.page-about .about-roles__text strong {
  color: var(--ky-text);
  opacity: 1;
  font-weight: 600;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
}

.page-about .about-timeline__rail {
  margin-bottom: 4px;
}

.page-about .about-timeline__rail svg {
  display: block;
  width: 100%;
  height: 12px;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 16px 0 16px 24px;
  border-bottom: 1px solid var(--ky-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ky-cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 200, .12);
  transition: background-color .16s var(--ky-ease), box-shadow .16s var(--ky-ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--ky-cyan-bright);
  box-shadow: 0 0 0 6px rgba(123, 243, 228, .18);
}

.page-about .about-timeline__year {
  margin: 0 0 4px;
  font-size: 20px;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--ky-yellow);
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ky-text);
}

.page-about .about-timeline__note {
  margin: 7px 0 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--ky-muted);
  overflow: hidden;
  transition: max-height .28s var(--ky-ease), opacity .22s var(--ky-ease);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-timeline__note {
    max-height: 0;
    opacity: 0;
  }
  .page-about .about-timeline__item:hover .about-timeline__note,
  .page-about .about-timeline__item:focus-within .about-timeline__note {
    max-height: 120px;
    opacity: 1;
  }
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 0;
  margin: 24px 0 24px;
  border-top: 1px solid var(--ky-line);
}

.page-about .about-reach__col {
  padding: 16px 0;
  border-bottom: 1px solid var(--ky-line);
}

.page-about .about-reach__title {
  margin: 0 0 7px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ky-cyan-bright);
  letter-spacing: -.01em;
}

.page-about .about-reach__col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ky-muted);
  opacity: 1;
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners {
  margin: 24px 0 8px;
}

.page-about .about-partners .ky-card {
  background: linear-gradient(160deg, rgba(16, 36, 27, .9) 0%, rgba(7, 19, 15, .9) 100%);
}

.page-about .about-partners__no {
  font-size: 30px;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ky-yellow);
}

.page-about .about-partners .ky-card__meta {
  color: var(--ky-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-about .about-award {
  margin: 20px 0 0;
  padding: 16px 0 0 16px;
  border-left: 2px solid var(--ky-red);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ky-text);
  opacity: .88;
}

/* ---------- 长期标准 ---------- */
.page-about .about-standards {
  list-style: none;
  margin: 22px 0 26px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-standards__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: rgba(16, 36, 27, .45);
  transition: border-color .16s var(--ky-ease), transform .16s var(--ky-ease);
}

.page-about .about-standards__item:hover {
  border-color: rgba(53, 224, 200, .55);
  transform: translateY(-2px);
}

.page-about .about-standards__key {
  font-family: var(--ky-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--ky-cyan);
}

.page-about .about-standards__val {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ky-text);
  opacity: .86;
}

.page-about .about-close {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--ky-line);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ky-text);
  opacity: .9;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about {
    --about-rail: 62px;
    --about-grid-gap: 22px;
  }

  .page-about .about-chapter__no {
    font-size: 32px;
  }

  .page-about .about-roles li {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .about-standards__item {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
    padding: 16px 18px;
  }

  .page-about .about-chain {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    border-top: 0;
  }

  .page-about .about-chain__step {
    padding: 20px 0 0;
    border-bottom: 0;
    border-top: 1px solid var(--ky-line);
  }

  .page-about .about-chain__step::before {
    left: 0;
    top: -4px;
  }

  .page-about .about-chain__step::after {
    left: 3px;
    top: 5px;
    bottom: auto;
    width: calc(100% + 18px);
    height: 1px;
    background: linear-gradient(90deg, var(--ky-line) 0%, rgba(30, 58, 47, 0) 100%);
  }

  .page-about .about-chain__step:last-child::after {
    display: none;
  }

  .page-about .about-reach {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    border-top: 0;
  }

  .page-about .about-reach__col {
    padding: 18px 0 0;
    border-bottom: 0;
    border-top: 1px solid var(--ky-line);
  }
}

@media (min-width: 880px) {
  .page-about {
    --about-rail: 104px;
    --about-grid-gap: 40px;
  }

  .page-about .about-hero {
    padding: 30px 0 56px;
  }

  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 56px;
  }

  .page-about .about-hero__board {
    max-width: 400px;
    margin: 0 0 0 auto;
  }

  .page-about .about-chapter {
    padding: 58px 0;
  }

  .page-about .about-chapter__no {
    font-size: 44px;
  }

  .page-about .about-chapter__rail {
    padding-top: 10px;
  }

  .page-about .about-chapter__rail::after {
    top: 60px;
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-timeline__item {
    padding: 22px 0 0;
    border-bottom: 0;
    border-top: 1px solid var(--ky-line);
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -5px;
  }

  .page-about .about-media--square .ky-media {
    max-width: 460px;
  }

  .page-about .about-media--square {
    margin-top: 36px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__facts {
    gap: 22px;
  }

  .page-about .about-chapter__body p {
    font-size: 15.5px;
  }
}