.page-about {
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 34px 44px;
  border-bottom: var(--bd) solid var(--line);
  background:
    radial-gradient(900px 400px at 84% -14%, rgba(47, 243, 208, 0.18), transparent 62%),
    linear-gradient(180deg, var(--ink-deep), var(--ink));
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(47, 243, 208, 0.055) 0 1px, transparent 1px 24px);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  font-size: 13px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2rem, 8.4vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 20ch;
}

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

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  display: flex;
  gap: 8px;
  margin-top: 30px;
  padding-block: 10px;
  border-top: var(--bd) solid var(--line);
  border-bottom: var(--bd) solid var(--line);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index a {
  flex: 0 0 auto;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color var(--t-fast) ease, background-color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-about .about-index a:hover,
.page-about .about-index a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: 56px;
  border-bottom: var(--bd) solid var(--line);
}

.page-about .about-chapter--panel {
  background:
    linear-gradient(180deg, rgba(14, 31, 26, 0.92), rgba(7, 17, 14, 0.92)),
    var(--ink);
}

.page-about .about-chapter__inner {
  display: grid;
  gap: 10px;
}

.page-about .about-chapter__head {
  position: relative;
  padding-top: 16px;
  border-top: 3px solid var(--cyan);
}

.page-about .about-chapter__head::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 64px;
  height: 3px;
  background: var(--flare);
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-size: clamp(1.5rem, 4.6vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  font-weight: 900;
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-chapter__body {
  margin-top: 22px;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.2em;
  line-height: 1.85;
}

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

.page-about .about-chapter__body a,
.page-about .about-quote a,
.page-about .prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .prose {
  max-width: 72ch;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: 30px;
  margin-top: 34px;
}

.page-about .about-roles {
  display: grid;
  gap: 18px;
}

.page-about .about-role {
  position: relative;
  padding: 22px 22px 24px 26px;
  background: var(--panel);
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow);
  transition: border-color var(--t-fast) ease, box-shadow var(--t-fast) ease, transform var(--t-fast) ease;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 5px;
  background: var(--cyan);
}

.page-about .about-role:nth-child(2)::before {
  background: var(--amber);
}

.page-about .about-role:nth-child(3)::before {
  background: var(--flare);
}

.page-about .about-role:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow-hover);
  transform: translate(-1px, -2px);
}

.page-about .about-role__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 44px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-role:nth-child(3) .about-role__count {
  color: var(--flare);
}

.page-about .about-role__name {
  margin: 12px 0 10px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team__figure {
  margin: 0;
  background: var(--panel);
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 7;
  object-fit: cover;
}

.page-about .figure__caption {
  display: block;
  padding: 12px 14px;
  border-top: var(--bd) solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 一场比赛的路 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-flow__step {
  padding: 20px 22px 22px;
  background:
    linear-gradient(180deg, rgba(47, 243, 208, 0.06), rgba(47, 243, 208, 0) 72%),
    var(--panel);
  border: var(--bd) solid var(--line);
  border-left: 6px solid var(--cyan-deep);
  box-shadow: var(--shadow);
  transition: border-color var(--t-fast) ease, box-shadow var(--t-fast) ease;
}

.page-about .about-flow__step:hover {
  border-color: var(--cyan);
  border-left-color: var(--flare);
  box-shadow: var(--shadow-hover);
}

.page-about .about-flow__title {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow__step p a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-version__figure {
  margin: 30px 0 0;
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .about-version__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

.page-about .about-timeline {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 36px 0 0;
  padding: 0 0 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--line);
}

.page-about .about-tl__node {
  position: relative;
  flex: 0 0 236px;
  margin-top: 26px;
  padding: 18px 16px 20px;
  scroll-snap-align: start;
  background: var(--panel);
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow);
  transition: border-color var(--t-fast) ease, box-shadow var(--t-fast) ease, transform var(--t-fast) ease;
}

.page-about .about-tl__node::before {
  content: "";
  position: absolute;
  top: -26px;
  left: 18px;
  width: 12px;
  height: 12px;
  background: var(--flare);
  transform: rotate(45deg);
}

.page-about .about-tl__node::after {
  content: "";
  position: absolute;
  top: -21px;
  left: 34px;
  right: -20px;
  height: 2px;
  background: var(--line);
}

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

.page-about .about-tl__node:hover,
.page-about .about-tl__node:focus-visible {
  border-color: var(--cyan);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.page-about .about-tl__node--current {
  border-color: var(--cyan);
}

.page-about .about-tl__node--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 243, 208, 0.22);
}

.page-about .about-tl__ver {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-tl__name {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.35;
}

.page-about .about-tl__peek {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  transition: color var(--t-fast) ease;
}

.page-about .about-tl__node:hover .about-tl__peek,
.page-about .about-tl__node:focus-visible .about-tl__peek {
  color: var(--paper);
}

/* ---------- 供应协作 ---------- */
.page-about .about-quote {
  margin-top: 26px;
  padding: 20px 22px;
  background: var(--panel);
  border: var(--bd) solid var(--line);
  border-left: 6px solid var(--flare);
  box-shadow: var(--shadow);
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
}

/* ---------- 服务地区 ---------- */
.page-about .about-region {
  border-top: var(--bd) solid var(--line);
  background:
    linear-gradient(110deg, rgba(255, 75, 31, 0.10) 0%, rgba(47, 243, 208, 0.09) 55%, rgba(7, 17, 14, 0) 100%),
    var(--ink);
}

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

.page-about .about-region .prose p {
  margin: 22px 0 0;
  line-height: 1.85;
}

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

.page-about .about-region__stats > .stat {
  background: var(--panel);
  padding: 18px;
}

.page-about .about-region__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-region__stats .stat--flare .stat__value {
  color: var(--flare);
}

.page-about .about-region__stats .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-region__figure {
  margin: 32px 0 0;
  border: var(--bd) solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .about-region__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  border-bottom: 0;
  background: linear-gradient(90deg, rgba(47, 243, 208, 0.10), rgba(255, 75, 31, 0.10));
}

.page-about .about-next__inner {
  display: grid;
  gap: 16px;
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 2rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding-block: 46px 58px;
  }

  .page-about .about-chapter {
    padding-block: 72px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 24px 40px;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__inner {
    grid-template-columns: minmax(0, 4.5fr) minmax(0, 7.5fr);
    gap: 24px 56px;
    align-items: start;
  }

  .page-about .about-chapter__inner--narrow {
    grid-template-columns: minmax(0, 3.2fr) minmax(0, 8.8fr);
  }

  .page-about .about-chapter__inner .about-chapter__body {
    margin-top: 0;
  }

  .page-about .about-region__top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-role:nth-child(1) {
    width: 78%;
  }

  .page-about .about-role:nth-child(2) {
    width: 92%;
    margin-left: auto;
  }

  .page-about .about-role:nth-child(3) {
    width: 100%;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-chapter {
    padding-block: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-flow__step,
  .page-about .about-tl__node,
  .page-about .about-index a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-tl__node:hover,
  .page-about .about-tl__node:focus-visible {
    transform: none;
  }
}