.page-about {
  --about-rail: 138px;
  --about-scope-pad: clamp(20px, 4vw, 44px);
  --about-ink: #0a1a33;
  --about-ink-soft: #23405f;
  padding-bottom: clamp(56px, 8vw, 110px);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 2.6vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(14px, 2vw, 24px);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background: linear-gradient(158deg, rgba(5, 14, 28, 0.92) 0%, rgba(10, 26, 51, 0.72) 58%, rgba(10, 26, 51, 0) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(22, 48, 79, 0.62) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22, 48, 79, 0.62) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 92% at 84% 16%, #000 0%, transparent 66%);
  mask-image: radial-gradient(120% 92% at 84% 16%, #000 0%, transparent 66%);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  padding-block: clamp(36px, 6.5vw, 84px);
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--c-gold);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  max-width: 22ch;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, 1.1vw, 1.1rem);
  line-height: 1.9;
  color: var(--c-text);
}

.page-about .about-glance {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-s) var(--radius-s);
  overflow: hidden;
}

.page-about .about-glance__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(15px, 1.9vw, 22px) clamp(13px, 1.7vw, 20px);
  background: rgba(5, 14, 28, 0.84);
  transition: background var(--dur) var(--ease);
}

.page-about .about-glance__item:hover {
  background: rgba(22, 48, 79, 0.72);
}

.page-about .about-glance__value {
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  font-weight: 900;
  line-height: 1;
  color: var(--c-gold-bright);
}

.page-about .about-glance__unit {
  margin-left: 4px;
  font-size: 0.5em;
  font-weight: 700;
  color: var(--c-graphite);
}

.page-about .about-glance__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-graphite);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-main {
  position: relative;
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
  padding-block: clamp(42px, 6vw, 76px);
  border-top: 1px solid var(--c-line);
  scroll-margin-top: 118px;
}

.page-about .about-chapter__index {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}

.page-about .about-chapter__num {
  font-size: clamp(2rem, 3.4vw, 2.9rem);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--c-gold);
  transition: color var(--dur) var(--ease), text-shadow var(--dur) var(--ease);
}

.page-about .about-chapter__index:hover .about-chapter__num {
  color: var(--c-gold-bright);
  text-shadow: 0 0 22px rgba(242, 206, 90, 0.35);
}

.page-about .about-chapter__note {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-graphite);
  white-space: nowrap;
}

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

.page-about .about-chapter__title {
  margin: 0 0 clamp(12px, 1.6vw, 18px);
  max-width: 26ch;
  font-size: clamp(1.3rem, 2.2vw, 1.85rem);
  font-weight: 700;
  line-height: 1.32;
  color: var(--c-paper);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.88;
  color: var(--c-text);
}

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

.page-about .about-chapter__body a:not(.about-next__link) {
  color: var(--c-gold-bright);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-chapter__body a:not(.about-next__link):hover {
  color: var(--c-paper);
}

/* ---------- 01 数据卡 ---------- */
.page-about .about-facts {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 17px 17px 19px;
  background: var(--c-linen);
  border-left: 3px solid var(--c-gold);
  border-radius: var(--radius-s) var(--radius-l) var(--radius-s) var(--radius-s);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-fact:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px -22px rgba(0, 0, 0, 0.9);
}

.page-about .about-fact__value {
  font-size: clamp(1.4rem, 2.4vw, 1.85rem);
  font-weight: 900;
  line-height: 1;
  color: var(--about-ink);
}

.page-about .about-fact__unit {
  margin-left: 3px;
  font-size: 0.52em;
  font-weight: 700;
  color: #16304f;
}

.page-about .about-fact__label {
  font-size: 13.5px;
  line-height: 1.68;
  color: #16304f;
}

/* ---------- 02 服务对象 ---------- */
.page-about .about-audiences {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-audience {
  padding: clamp(17px, 2.2vw, 26px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
  background: rgba(5, 14, 28, 0.55);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-audience:hover {
  background: var(--c-linen);
  border-color: var(--c-gold);
  transform: translateY(-2px);
}

.page-about .about-audience__title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-paper);
  transition: color var(--dur) var(--ease);
}

.page-about .about-audience__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-graphite);
  transition: color var(--dur) var(--ease);
}

.page-about .about-audience:hover .about-audience__title {
  color: var(--about-ink);
}

.page-about .about-audience:hover .about-audience__desc {
  color: var(--about-ink-soft);
}

/* ---------- 03 校对流程 ---------- */
.page-about .about-chapter__split {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(16px, 2.2vw, 24px) 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--c-line);
  counter-reset: flowstep;
}

.page-about .about-flow li {
  position: relative;
  margin: 0 0 18px;
  max-width: var(--measure);
  padding-left: 0;
  font-size: 15.5px;
  line-height: 1.84;
  color: var(--c-text);
  counter-increment: flowstep;
}

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

.page-about .about-flow li::before {
  content: counter(flowstep, decimal-leading-zero);
  position: absolute;
  left: -34px;
  top: 1px;
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--c-gold);
  background: var(--c-midnight);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0;
  color: var(--c-gold);
}

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

/* ---------- 通栏图 ---------- */
.page-about .about-banner {
  margin-block: clamp(34px, 5vw, 64px);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

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

/* ---------- 05 时间线 ---------- */
.page-about .about-timeline {
  margin-top: clamp(22px, 3vw, 34px);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 24px 8px 24px 28px;
  outline: none;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--c-line);
}

.page-about .about-timeline__item:last-child::after {
  background: linear-gradient(to bottom, var(--c-line) 0%, transparent 72%);
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -5px;
  top: 30px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-cyan);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-visible .about-timeline__dot {
  background: var(--c-gold);
  border-color: var(--c-gold-bright);
  transform: scale(1.45);
}

.page-about .about-timeline__era {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .about-timeline__head {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-paper);
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__head {
  color: var(--c-gold-bright);
}

.page-about .about-timeline__desc {
  margin: 0 0 10px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.76;
  color: var(--c-text);
}

.page-about .about-timeline__more {
  position: relative;
  margin: 0;
  max-width: 34ch;
  padding-left: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-graphite);
  border-left: 2px solid var(--c-line);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-visible .about-timeline__more {
  border-left-color: var(--c-gold);
  color: var(--c-paper);
}

/* ---------- 06 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-team__group {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s) var(--radius-l) var(--radius-s) var(--radius-s);
  background: rgba(5, 14, 28, 0.5);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team__group:hover {
  border-color: var(--c-gold);
  background: rgba(22, 48, 79, 0.42);
}

.page-about .about-team__count {
  margin: 0 0 10px;
  font-size: clamp(1.9rem, 3vw, 2.5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-team__unit {
  margin-left: 4px;
  font-size: 0.42em;
  font-weight: 700;
  color: var(--c-graphite);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .about-team__desc {
  margin: 0;
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.84;
  color: var(--c-graphite);
}

/* ---------- 07 合作生态 ---------- */
.page-about .about-eco {
  position: relative;
  margin-top: clamp(16px, 2.2vw, 24px);
  padding: clamp(22px, 3.6vw, 46px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
  overflow: hidden;
}

.page-about .about-eco__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-eco__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.page-about .about-eco__content {
  position: relative;
  z-index: 1;
}

.page-about .about-eco__content p {
  max-width: 60ch;
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  font-size: 16px;
  line-height: 1.88;
  color: var(--c-text);
}

.page-about .about-eco__creds {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  background: rgba(22, 48, 79, 0.75);
  border: 1px solid rgba(22, 48, 79, 0.75);
  border-radius: var(--radius-s);
  overflow: hidden;
}

.page-about .about-eco__cred {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 16px 18px;
  background: rgba(5, 14, 28, 0.86);
}

.page-about .about-eco__cred-num {
  font-size: clamp(1.5rem, 2.4vw, 1.95rem);
  font-weight: 900;
  line-height: 1;
  color: var(--c-magenta);
}

.page-about .about-eco__cred-label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-paper);
}

/* ---------- 08 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-next__link {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-s) var(--radius-s);
  background: linear-gradient(140deg, rgba(5, 14, 28, 0.86), rgba(10, 26, 51, 0.55));
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-next__link:hover {
  border-color: var(--c-gold);
  transform: translateY(-2px);
  background: linear-gradient(140deg, rgba(22, 48, 79, 0.9), rgba(10, 26, 51, 0.6));
}

.page-about .about-next__kicker {
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--c-gold);
}

.page-about .about-next__title {
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-paper);
  transition: color var(--dur) var(--ease);
}

.page-about .about-next__link:hover .about-next__title {
  color: var(--c-gold-bright);
}

.page-about .about-next__desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-graphite);
}

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

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

@media (min-width: 820px) {
  .page-about .about-audiences {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-audience:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .about-audience:nth-child(2) {
    grid-column: 9 / span 4;
  }

  .page-about .about-audience:nth-child(3) {
    grid-column: 3 / span 10;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 3.2vw, 48px);
  }

  .page-about .about-chapter__index {
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-chapter__note {
    writing-mode: vertical-rl;
    text-orientation: upright;
    letter-spacing: 0.18em;
  }

  .page-about .about-timeline__track {
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
  }

  .page-about .about-timeline__item {
    padding: 34px 20px 0 0;
  }

  .page-about .about-timeline__item::after {
    left: 0;
    right: 0;
    top: 0;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .about-timeline__item:last-child::after {
    background: linear-gradient(to right, var(--c-line) 0%, transparent 74%);
  }

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

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

@media (min-width: 1080px) {
  .page-about .about-chapter__split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  }
}

@media (max-width: 480px) {
  .page-about .about-glance {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-chapter__index {
    gap: 10px;
  }

  .page-about .about-chapter__note {
    letter-spacing: 0.14em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fact,
  .page-about .about-audience,
  .page-about .about-next__link,
  .page-about .about-timeline__dot,
  .page-about .about-chapter__num {
    transition: none;
  }

  .page-about .about-fact:hover,
  .page-about .about-audience:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }
}