.page-about {
  --about-rail: 236px;
  --about-rule: 1px solid var(--line);
  background: var(--abyss);
  color: var(--mist);
  font-family: var(--font-body);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .breadcrumb {
  padding: 18px 0 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px) 0 clamp(34px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -12%;
  left: -12%;
  height: 72%;
  background: linear-gradient(150deg, rgba(10, 30, 51, 0.96) 0%, rgba(4, 18, 31, 0) 64%);
  clip-path: polygon(0 0, 100% 0, 100% 76%, 0 100%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: -12%;
  left: -12%;
  height: 72%;
  background-image:
    repeating-linear-gradient(90deg, rgba(28, 58, 85, 0.55) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(28, 58, 85, 0.32) 0 1px, transparent 1px 96px);
  clip-path: polygon(0 0, 100% 0, 100% 76%, 0 100%);
  opacity: 0.65;
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(40px, 8.6vw, 86px);
  line-height: 0.97;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 20px 0 0;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__lead--sm {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

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

/* ---------- 首屏数据窗格 ---------- */
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--line);
  align-self: stretch;
}

.page-about .about-stat {
  min-width: 0;
  padding: 15px 14px 17px;
  background: var(--panel);
}

.page-about .about-stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .about-stat dd {
  margin: 9px 0 0;
  min-width: 0;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 4.4vw, 32px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--cyan-soft);
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-stat__note {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--slate);
}

/* ---------- 主体两栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  padding-bottom: clamp(48px, 8vw, 92px);
}

.page-about .about-rail,
.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */
.page-about .toc {
  border: var(--about-rule);
  background: var(--panel);
  padding: 12px 14px 14px;
}

.page-about .toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

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

.page-about .toc__link {
  display: block;
  padding: 7px 12px;
  white-space: nowrap;
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

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

.page-about .toc__link[aria-current="true"] {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(30px, 5vw, 58px) 0;
  border-top: var(--about-rule);
}

.page-about .about-section:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section .section-head__title {
  color: var(--white);
}

.page-about .about-prose {
  max-width: 68ch;
  margin-top: 18px;
}

.page-about .about-prose p {
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .about-prose p:first-child {
  font-size: 18px;
  line-height: 1.75;
  color: var(--white);
}

.page-about .about-icp {
  font-family: var(--font-mono);
  font-size: 0.94em;
  color: var(--cyan-soft);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.45);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
}

.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: var(--about-rule);
  background: var(--stand);
}

.page-about .about-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(34, 211, 238, 0.06) 0 1px, transparent 1px 4px);
  pointer-events: none;
}

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

.page-about .about-media--wide {
  aspect-ratio: 16 / 9;
}

.page-about .about-media--tall {
  aspect-ratio: 10 / 7;
}

.page-about .about-media--band {
  aspect-ratio: 2 / 1;
}

.page-about .about-media__cap {
  margin: 10px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 团队角色（技能树式连线） ---------- */
.page-about .about-roles {
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0 0 0 24px;
  list-style: none;
}

.page-about .about-role {
  position: relative;
  padding: 0 0 24px;
}

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

.page-about .about-role::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: -6px;
  left: -19px;
  width: 1px;
  background: var(--line);
}

.page-about .about-role:last-child::before {
  display: none;
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  top: 6px;
  left: -24px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: var(--abyss);
}

.page-about .about-role__title {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--cyan-soft);
}

.page-about .about-role__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0 0 0 24px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 10px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 55%, rgba(28, 58, 85, 0) 100%);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 28px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -24px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: var(--abyss);
  box-shadow: 0 0 0 4px var(--abyss);
}

.page-about .about-node:first-child::before {
  background: var(--cyan);
}

.page-about .about-node__ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-node__desc {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 合作标签矩阵 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags li {
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-tags li:nth-child(-n + 2) {
  border-color: var(--cyan);
  color: var(--cyan-soft);
}

/* ---------- 荣誉 ---------- */
.page-about .about-award {
  position: relative;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--coral);
  background:
    linear-gradient(135deg, rgba(255, 107, 74, 0.14) 0%, rgba(255, 107, 74, 0) 58%),
    var(--panel);
}

.page-about .about-award__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--coral);
}

.page-about .about-award__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.25;
  color: var(--white);
}

.page-about .about-award__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 生产环节 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-step {
  padding: 20px 18px 22px;
  background: var(--stand);
}

.page-about .about-step__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--coral);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(34, 211, 238, 0.1) 0%, rgba(34, 211, 238, 0) 62%),
    var(--panel);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
  }

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

  .page-about .about-roles {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 40px);
    padding-left: 24px;
  }

  .page-about .about-role:nth-last-child(2)::before {
    bottom: 6px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(30px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    align-self: stretch;
  }

  .page-about .about-rail .toc {
    position: sticky;
    top: 96px;
    padding: 16px 18px 18px;
  }

  .page-about .toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .toc__link {
    padding: 9px 0 9px 14px;
    white-space: normal;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    color: var(--slate);
  }

  .page-about .toc__link:hover,
  .page-about .toc__link:focus-visible {
    color: var(--cyan-soft);
    border-left-color: var(--line);
    background: transparent;
  }

  .page-about .toc__link[aria-current="true"] {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: transparent;
    font-weight: 600;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc__link {
    transition: none;
  }
}