.page-about {
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

.page-about .about-link {
  color: var(--blue);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 168, 255, .4);
  padding-bottom: 2px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}
.page-about .about-link:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  border-bottom: var(--hair);
  padding: clamp(22px, 4vw, 44px) 0 clamp(44px, 6vw, 84px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(42, 63, 92, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 63, 92, .5) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 92% at 78% 28%, #000 0%, transparent 74%);
  mask-image: radial-gradient(120% 92% at 78% 28%, #000 0%, transparent 74%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
}
.page-about .about-hero__copy {
  min-width: 0;
}
.page-about .about-hero__title {
  margin: 20px 0 0;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.16;
  font-weight: 900;
  color: var(--white);
  letter-spacing: -0.01em;
}
.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.95;
  color: var(--text);
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: var(--hair);
}
.page-about .about-hero__fact {
  min-width: 0;
}
.page-about .about-hero__fact dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--muted);
}
.page-about .about-hero__fact dd {
  margin: 8px 0 0;
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 700;
  color: var(--orange);
  word-break: break-word;
}
.page-about .about-hero__visual {
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
}
.page-about .about-hero__visual svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  border-bottom: var(--hair);
  padding: clamp(48px, 8vw, 104px) 0;
}
.page-about .about-sec--alt {
  background:
    linear-gradient(180deg, rgba(7, 20, 38, .85) 0%, rgba(11, 30, 51, 1) 100%);
}
.page-about .about-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(30px, 5vw, 56px);
  max-width: 78ch;
}
.page-about .about-head__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--cyan);
}
.page-about .about-head__title {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.32;
  font-weight: 900;
  color: var(--white);
}
.page-about .about-head__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--muted);
}
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
}
.page-about .about-lead {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 2;
  color: var(--text);
}
.page-about .about-note {
  margin: 0;
  padding: 16px 18px;
  border-left: 2px solid var(--orange);
  background: rgba(20, 41, 74, .5);
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 第一节 ---------- */
.page-about .about-pull {
  margin: 0;
  padding: 6px 0 6px 22px;
  border-left: 2px solid var(--orange);
  font-size: clamp(17px, 2.3vw, 22px);
  line-height: 1.72;
  font-weight: 700;
  color: var(--white);
  max-width: 34ch;
}
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
.page-about .about-rule {
  border-top: 2px solid var(--line);
  padding-top: 18px;
}
.page-about .about-rule__idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--blue);
}
.page-about .about-rule h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-rule p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 图表 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(30px, 5vw, 54px);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--hair);
  border-radius: 2px;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 迭代序列 ---------- */
.page-about .about-axis {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
}
.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--cyan) 58%, var(--orange) 100%);
  opacity: .55;
}
.page-about .about-axis__item {
  position: relative;
  padding-left: 30px;
  min-width: 0;
}
.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--dot, var(--cyan));
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .about-axis__item:nth-child(1) { --dot: var(--blue); }
.page-about .about-axis__item:nth-child(2) { --dot: var(--blue); }
.page-about .about-axis__item:nth-child(3) { --dot: var(--cyan); }
.page-about .about-axis__item:nth-child(4) { --dot: var(--cyan); }
.page-about .about-axis__item:nth-child(5) { --dot: var(--orange); }
.page-about .about-axis__item:hover::before,
.page-about .about-axis__item:focus-within::before {
  transform: scale(1.3);
  box-shadow: 0 0 0 6px rgba(0, 229, 255, .12);
}
.page-about .about-axis__mark {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 10px;
  border: var(--hair);
  border-radius: 2px;
  background: var(--panel);
  color: var(--white);
  font-size: 13px;
  letter-spacing: .06em;
  cursor: default;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.page-about .about-axis__mark:hover,
.page-about .about-axis__mark:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}
.page-about .about-axis__mark:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .about-axis__body {
  min-width: 0;
}
.page-about .about-axis__body h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.3vw, 21px);
  font-weight: 700;
  color: var(--white);
}
.page-about .about-axis__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
.page-about .about-crew__card {
  min-width: 0;
  padding: 22px 20px 24px;
  border: var(--hair);
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(20, 41, 74, .7) 0%, rgba(11, 30, 51, .92) 100%);
  transition: border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .about-crew__card:hover,
.page-about .about-crew__card:focus-within {
  border-color: rgba(0, 229, 255, .7);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.page-about .about-crew__card:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .about-crew__idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--muted);
}
.page-about .about-crew__name {
  margin: 12px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-crew__desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}
.page-about .about-crew__duties {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: var(--hair);
  display: grid;
  gap: 8px;
}
.page-about .about-crew__duties li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text);
}
.page-about .about-crew__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1px;
  background: var(--orange);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
.page-about .about-eco__card {
  min-width: 0;
  padding: 24px 22px 26px;
  border: var(--hair);
  border-top: 3px solid var(--accent, var(--blue));
  border-radius: 2px;
  background: var(--ink-deep);
  transition: background .25s var(--ease), border-color .25s var(--ease);
}
.page-about .about-eco__card:nth-child(1) { --accent: var(--blue); }
.page-about .about-eco__card:nth-child(2) { --accent: var(--cyan); }
.page-about .about-eco__card:nth-child(3) { --accent: var(--orange); }
.page-about .about-eco__card:hover,
.page-about .about-eco__card:focus-within {
  background: var(--panel);
  border-color: rgba(224, 228, 232, .28);
}
.page-about .about-eco__card:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .about-eco__idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--accent, var(--blue));
}
.page-about .about-eco__name {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-eco__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.95;
  color: var(--muted);
}
.page-about .about-eco__meta {
  margin: 0;
  padding-top: 12px;
  border-top: var(--hair);
  font-size: 13px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 归档方法 ---------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: var(--hair);
  border-radius: 2px;
  overflow: hidden;
}
.page-about .about-archive__col {
  min-width: 0;
  padding: 26px 22px;
  border-bottom: var(--hair);
  background: rgba(20, 41, 74, .35);
  transition: background .25s var(--ease);
}
.page-about .about-archive__col:last-child {
  border-bottom: 0;
}
.page-about .about-archive__col:hover {
  background: rgba(20, 41, 74, .7);
}
.page-about .about-archive__tag {
  margin: 0;
}
.page-about .about-archive__title {
  margin: 14px 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-archive__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}
.page-about .about-archive__link {
  margin: 0;
}

/* ---------- 年度路线 ---------- */
.page-about .about-roadmap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}
.page-about .about-roadmap__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text);
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 8px;
  height: 2px;
  background: var(--orange);
}
.page-about .about-list--dash li::before {
  background: var(--cyan);
}
.page-about .about-faq {
  border: var(--hair);
  border-radius: 2px;
  background: rgba(20, 41, 74, .35);
  padding: 16px 18px;
  transition: background .25s var(--ease);
}
.page-about .about-faq + .about-faq {
  margin-top: 12px;
}
.page-about .about-faq:hover {
  background: rgba(20, 41, 74, .68);
}
.page-about .about-faq__q {
  cursor: pointer;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--white);
  list-style: none;
}
.page-about .about-faq__q::-webkit-details-marker {
  display: none;
}
.page-about .about-faq__q::after {
  content: "＋";
  float: right;
  margin-left: 12px;
  font-family: var(--font-mono);
  color: var(--cyan);
}
.page-about .about-faq[open] .about-faq__q::after {
  content: "－";
}
.page-about .about-faq__q:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 4px;
}
.page-about .about-faq__a {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.95;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-bottom: 0;
}
.page-about .about-cta__box {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: center;
  padding: clamp(26px, 4vw, 48px);
  border: var(--hair);
  border-radius: 2px;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 107, 53, .18) 0%, transparent 58%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink-deep) 100%);
}
.page-about .about-cta__note {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--orange-soft);
}
.page-about .about-cta__title {
  margin: 0 0 14px;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.35;
  font-weight: 900;
  color: var(--white);
}
.page-about .about-cta__lead {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--text);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-axis::before {
    left: 96px;
  }
  .page-about .about-axis__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 34px;
    padding-left: 0;
  }
  .page-about .about-axis__item::before {
    left: 92px;
  }
  .page-about .about-axis__mark {
    justify-self: end;
    margin-bottom: 0;
    margin-top: 2px;
  }
}

@media (min-width: 880px) {
  .page-about .about-archive {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-archive__col {
    border-bottom: 0;
    border-right: var(--hair);
  }
  .page-about .about-archive__col:last-child {
    border-right: 0;
  }
  .page-about .about-eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-roadmap {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-head {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 12px 32px;
    align-items: start;
  }
  .page-about .about-head__note {
    grid-column: 1;
    grid-row: 1;
    padding-top: 8px;
  }
  .page-about .about-head__title,
  .page-about .about-head__lead {
    grid-column: 2;
  }
  .page-about .about-head--v .about-head__note {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    padding-top: 4px;
    align-self: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.34fr) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    justify-items: start;
  }
  .page-about .about-cta__actions {
    justify-content: flex-end;
    width: 100%;
  }
}

@media (min-width: 1180px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__card,
  .page-about .about-axis__item::before,
  .page-about .about-axis__mark,
  .page-about .about-eco__card,
  .page-about .about-archive__col,
  .page-about .about-link {
    transition: none;
  }
  .page-about .about-crew__card:hover,
  .page-about .about-crew__card:focus-within {
    transform: none;
  }
  .page-about .about-axis__item:hover::before,
  .page-about .about-axis__item:focus-within::before {
    transform: none;
  }
}