.page-about {
  --about-line: rgba(42, 74, 107, .5);
  --about-line-soft: rgba(42, 74, 107, .3);
  --about-block-gap: clamp(52px, 8vw, 104px);
  --about-col-gap: clamp(24px, 4vw, 56px);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  padding-bottom: var(--dock-space);
  background-color: var(--deep-sea);
  background-image:
    linear-gradient(rgba(42, 74, 107, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 74, 107, .14) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  line-height: 1.25;
}

.page-about p {
  margin: 0;
}

.page-about a {
  color: inherit;
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 4vw, 40px) 0 clamp(36px, 5vw, 68px);
}

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

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-family: var(--font-editorial);
  font-size: 14px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-hero__eyebrow::after {
  content: "";
  width: 64px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .about-hero h1 {
  max-width: 16em;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 58px);
  letter-spacing: -.015em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin-top: 20px;
  font-size: clamp(16px, 1.9vw, 18px);
  color: var(--steel);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  align-self: start;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .about-hero__stats > div {
  background: var(--deep-sea);
  padding: 16px 18px;
}

.page-about .about-hero__stats dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .about-hero__stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.1;
  color: var(--cyan);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: rgba(10, 26, 47, .94);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-toc__list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px;
  font-size: 14px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--steel);
  border-right: 1px solid var(--about-line-soft);
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--mist);
  background: rgba(0, 229, 255, .09);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

/* ---------- 通用区块骨架 ---------- */
.page-about .about-block {
  padding: var(--about-block-gap) 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-block:last-of-type {
  border-bottom: 0;
}

.page-about .about-block__grid {
  display: grid;
  gap: var(--about-col-gap);
}

.page-about .about-block__head {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-block__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--coral);
}

.page-about .about-block h2 {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 34px);
  color: var(--mist);
}

.page-about .about-block__body {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-lead {
  max-width: 62ch;
  font-size: clamp(16px, 1.8vw, 19px);
  color: var(--mist);
}

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

/* ---------- 使用者卡片 ---------- */
.page-about .role-list {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role-card {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(180deg, rgba(20, 47, 79, .85), rgba(13, 36, 64, .85));
  border: 1px solid var(--about-line);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), transform .2s var(--ease);
}

.page-about .role-card::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px dashed rgba(42, 74, 107, .5);
  pointer-events: none;
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.page-about .role-card__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--deep-sea);
  background: var(--cyan);
}

.page-about .role-card--alt .role-card__tag {
  background: var(--coral);
  color: var(--paper);
}

.page-about .role-card h3 {
  margin-bottom: 10px;
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .role-card p {
  font-size: 15px;
  color: var(--steel);
}

/* ---------- 更新节奏 ---------- */
.page-about .pace-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .pace-list li {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .pace-list__time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--green);
}

.page-about .pace-list h3 {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .pace-list p {
  font-size: 15px;
  color: var(--steel);
}

/* ---------- 团队与质量 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .team-copy {
  display: grid;
  gap: 20px;
}

.page-about .quality-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .quality-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 20px;
  background: var(--deep-sea);
}

.page-about .quality-list__num {
  flex: 0 0 auto;
  min-width: 4.5ch;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 600;
  color: var(--cyan);
}

.page-about .quality-list h3 {
  margin-bottom: 6px;
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .quality-list p {
  font-size: 14px;
  color: var(--steel);
}

.page-about .team-note {
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 14px;
  color: var(--steel);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 24px;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--blueprint) 55%, transparent);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 15px;
  height: 15px;
  box-sizing: border-box;
  background: var(--deep-sea);
  border: 1px solid var(--blueprint);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-timeline__card {
  max-width: 720px;
  padding: 18px 20px;
  background: rgba(13, 36, 64, .72);
  border: 1px solid var(--about-line-soft);
  border-left: 2px solid var(--blueprint);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-within .about-timeline__card {
  border-left-color: var(--cyan);
  background: rgba(20, 47, 79, .8);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-about .about-timeline__stage {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--coral);
}

.page-about .about-timeline h3 {
  margin-bottom: 8px;
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-timeline p {
  font-size: 15px;
  color: var(--steel);
}

.page-about .about-timeline__extra {
  display: block;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--green);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .eco-card {
  padding: 22px 20px;
  background: var(--deep-sea);
  transition: background-color .2s var(--ease);
}

.page-about .eco-card:hover {
  background: var(--ink-blue);
}

.page-about .eco-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .eco-card h3 {
  margin: 10px 0 6px;
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .eco-card p {
  font-size: 14px;
  color: var(--steel);
}

.page-about .eco-award {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: var(--paper);
  border: 1px solid #C9D8E6;
}

.page-about .eco-award__label {
  flex: 0 0 auto;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--paper);
  background: var(--deep-sea);
}

.page-about .eco-award p {
  font-size: 15px;
  font-weight: 600;
  color: var(--deep-sea);
}

/* ---------- 服务节点与联系 ---------- */
.page-about .nodes-layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .nodes-copy {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .contact-panel {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--about-line-soft);
  border: 1px solid var(--line-strong);
}

.page-about .contact-panel__row {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: linear-gradient(180deg, rgba(20, 47, 79, .8), rgba(10, 26, 47, .9));
}

.page-about .contact-panel__row dt {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
}

.page-about .contact-panel__row dd {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
}

.page-about .contact-panel__value {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--mist);
  word-break: break-all;
}

.page-about .contact-panel__note {
  font-size: 14px;
  color: var(--steel);
}

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

.page-about .copy-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--about-line);
  padding: 4px 10px;
  cursor: pointer;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease);
}

.page-about .copy-btn:hover {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, .1);
}

.page-about .copy-btn.is-done {
  color: var(--deep-sea);
  background: var(--green);
  border-color: var(--green);
}

.page-about .back-top {
  margin: 40px auto 0;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .role-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-block__grid {
    grid-template-columns: minmax(200px, 260px) minmax(0, 1fr);
  }

  .page-about .about-block__head {
    position: sticky;
    top: calc(var(--header-h) + 72px);
    align-self: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .nodes-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

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

  .page-about .pace-list li {
    padding: 24px 22px;
    border-bottom: 0;
    border-left: 1px solid var(--about-line-soft);
  }

  .page-about .pace-list li:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 48px);
    row-gap: 44px;
    align-items: start;
  }

  .page-about .about-hero__copy {
    grid-column: 1 / span 7;
  }

  .page-about .about-hero__figure {
    grid-column: 9 / span 4;
    margin-top: 48px;
  }

  .page-about .about-hero__stats {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .role-list {
    grid-template-columns: 1.15fr 1fr 1fr;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .about-timeline__card,
  .page-about .eco-card,
  .page-about .copy-btn,
  .page-about .about-toc__list a {
    transition: none;
  }

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