.page-about {
  --about-rail: 92px;
  --about-line-gap: clamp(32px, 6vw, 64px);
  --about-radius: 10px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  margin-bottom: 6px;
}

.page-about .breadcrumbs__list li a {
  color: var(--ice);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .breadcrumbs__list li a:hover,
.page-about .breadcrumbs__list li a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding: clamp(18px, 4vw, 38px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 7vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: 0.02em;
  margin: 12px 0 18px;
  color: #ffffff;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: var(--text);
  max-width: 60ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
}

.page-about .about-hero__facts strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__facts span {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ice);
}

/* 首屏数据面板 */
.page-about .about-hero__panel {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--about-radius);
  background:
    radial-gradient(circle at 90% 0%, rgba(62, 242, 224, 0.18), transparent 58%),
    linear-gradient(155deg, var(--grad-a), var(--grad-b));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-hero__panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-hero__row {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 10px;
  padding-bottom: 11px;
  border-bottom: 1px dashed rgba(244, 232, 208, 0.18);
  font-size: 0.85rem;
  line-height: 1.6;
}

.page-about .about-hero__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-hero__k {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.03em;
  flex: none;
}

.page-about .about-hero__v {
  color: rgba(236, 244, 250, 0.84);
  min-width: 0;
}

/* ---------- 章节跳转条 ---------- */
.page-about .about-jump {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin: 0 0 4px;
  padding: 10px 0;
  background: linear-gradient(180deg, rgba(7, 11, 20, 0.97), rgba(7, 11, 20, 0.82));
  border-bottom: 1px solid var(--line);
}

.page-about .about-jump__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-jump__link {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--ice);
  text-decoration: none;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
}

/* ---------- 纵向时间轴章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: var(--about-line-gap) 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 76px);
}

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

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-chapter__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--magenta);
  box-shadow: 0 0 0 4px rgba(255, 61, 154, 0.16);
}

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

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4.4vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin: 8px 0 14px;
  color: #ffffff;
}

.page-about .about-chapter__body > p {
  margin: 0 0 14px;
  font-size: clamp(0.94rem, 1.2vw, 1.02rem);
  line-height: 1.8;
  color: var(--text);
  max-width: 64ch;
}

/* ---------- 图文错位分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

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

.page-about .about-split__text p {
  margin: 0 0 14px;
  font-size: clamp(0.94rem, 1.2vw, 1.02rem);
  line-height: 1.8;
  color: var(--text);
  max-width: 62ch;
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--venue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure--banner img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 26px 14px 12px;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--ice);
  background: linear-gradient(180deg, rgba(7, 11, 20, 0), rgba(7, 11, 20, 0.9));
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-milestone {
  position: relative;
  padding: 30px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(165deg, var(--venue), rgba(14, 22, 38, 0.42));
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-milestone:hover,
.page-about .about-milestone:focus-within {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-milestone__tag {
  position: absolute;
  top: -12px;
  left: 16px;
  padding: 4px 10px;
  border-radius: 3px;
  background: var(--paper);
  color: var(--brown);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transform: rotate(-1.6deg);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.45);
}

.page-about .about-milestone h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: #ffffff;
}

.page-about .about-milestone p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ice);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  margin-top: 8px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-team__item {
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: rgba(14, 22, 38, 0.5);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-team__item:hover {
  border-color: var(--line-strong);
}

.page-about .about-team__item[open] {
  border-color: var(--line-strong);
  background: rgba(14, 22, 38, 0.88);
}

.page-about .about-team__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-team__summary::marker {
  content: "";
}

.page-about .about-team__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team__item[open] .about-team__summary::after {
  content: "\2212";
  color: var(--orange);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-team__role {
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #ffffff;
}

.page-about .about-team__more {
  padding: 0 16px 16px;
}

.page-about .about-team__more p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--ice);
}

/* ---------- 费用档案纸层 ---------- */
.page-about .about-archive {
  position: relative;
  margin: 22px 0 16px;
  padding: 26px 18px 20px;
  border-radius: 6px;
  background: var(--paper);
  color: var(--brown);
  box-shadow: 9px 9px 0 rgba(255, 122, 26, 0.22);
}

.page-about .about-archive__stamp {
  position: absolute;
  top: -12px;
  right: 16px;
  padding: 4px 12px;
  border: 1px solid rgba(42, 24, 16, 0.55);
  border-radius: 2px;
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--brown);
  transform: rotate(2.4deg);
}

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

.page-about .about-archive__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(42, 24, 16, 0.3);
}

.page-about .about-archive__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-archive__ver {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-archive__price {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: #a63c00;
}

.page-about .about-archive__note {
  flex-basis: 100%;
  font-size: 0.81rem;
  line-height: 1.7;
  color: rgba(42, 24, 16, 0.8);
}

.page-about .about-archive__link {
  margin: 0;
  font-size: 0.9rem;
}

.page-about .about-archive__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 242, 224, 0.4);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-archive__link a:hover,
.page-about .about-archive__link a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 合作生态节点 ---------- */
.page-about .about-net {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-net__node {
  position: relative;
  padding: 20px 16px 16px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 0 0 8px 8px;
  background: rgba(14, 22, 38, 0.52);
  transition: border-top-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-net__node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--magenta);
  box-shadow: 0 0 0 3px rgba(255, 61, 154, 0.15);
}

.page-about .about-net__node:hover {
  border-top-color: var(--orange);
  background: rgba(14, 22, 38, 0.9);
}

.page-about .about-net__type {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-net__node p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--ice);
}

.page-about .about-net__node a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 184, 200, 0.5);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-net__node a:hover,
.page-about .about-net__node a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-promise__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-promise__item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: #ffffff;
}

.page-about .about-promise__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--ice);
  max-width: 56ch;
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin: clamp(32px, 6vw, 64px) 0 clamp(28px, 5vw, 48px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line-strong);
  border-radius: var(--about-radius);
  background:
    radial-gradient(circle at 0% 0%, rgba(255, 122, 26, 0.16), transparent 55%),
    linear-gradient(140deg, var(--venue), var(--ink));
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-cta__text h2 {
  margin: 8px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: #ffffff;
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ice);
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-cta__link {
  font-size: 0.86rem;
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 184, 200, 0.45);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-milestones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .about-chapter__rail {
    position: relative;
    flex-direction: column;
    align-items: center;
    align-self: stretch;
    gap: 12px;
    padding-top: 10px;
  }

  .page-about .about-chapter__rail::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: calc(-1 * var(--about-line-gap));
    left: 50%;
    width: 1px;
    transform: translateX(-50%);
    background: linear-gradient(180deg, rgba(62, 242, 224, 0.42), rgba(62, 242, 224, 0.05));
  }

  .page-about .about-chapter:first-child .about-chapter__rail::before {
    top: 34px;
  }

  .page-about .about-chapter--last .about-chapter__rail::before {
    display: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-hero__panel {
    margin-top: 12px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: clamp(26px, 4vw, 44px);
    align-items: start;
  }

  .page-about .about-split__figure {
    margin-top: 30px;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.78fr);
  }

  .page-about .about-split--reverse .about-figure {
    margin-top: 46px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-milestone,
  .page-about .about-team__item,
  .page-about .about-net__node,
  .page-about .about-jump__link {
    transition: none;
  }

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