.page-about {
  --about-pad: clamp(40px, 7vw, 96px);
  position: relative;
  background:
    radial-gradient(circle at 86% 4%, rgba(22, 80, 58, .55), transparent 56%),
    var(--c-night);
  color: var(--ink-1);
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 3vw, 28px);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(30px, 5vw, 60px) clamp(44px, 7vw, 92px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 58ch;
  font-size: clamp(14px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__facts li {
  font-size: 12px;
  line-height: 1.55;
  color: var(--ink-3);
}

.page-about .about-hero__facts .num {
  display: block;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.05;
  color: var(--c-grass);
  margin-bottom: 4px;
}

.page-about .about-hero__cta {
  margin-top: clamp(22px, 3.5vw, 32px);
}

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

.page-about .about-board {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line-mid);
  border-radius: 22px 6px 22px 6px;
  background: linear-gradient(150deg, var(--c-pitch), var(--c-night) 78%);
}

.page-about .about-hero__caption {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-3);
  font-family: var(--font-num);
}

/* 章节索引 + 主体 */
.page-about .about-body {
  display: grid;
  gap: clamp(20px, 4vw, 32px);
  padding-bottom: var(--about-pad);
}

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

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--ink-3);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list a {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 12px;
  color: var(--ink-3);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-grass);
  border-color: var(--line-hard);
}

/* 章节通用 */
.page-about .about-sec {
  padding-block: clamp(36px, 6vw, 80px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(12px, 2.5vw, 24px);
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-sec__num {
  flex: none;
  font-size: clamp(40px, 9vw, 92px);
  line-height: .82;
  letter-spacing: -.05em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-hard);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 34px);
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--ink-1);
}

.page-about .about-sec__vert {
  display: none;
}

.page-about .about-sec__lead {
  max-width: 62ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-sec__body > p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--ink-2);
}

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

/* 图文分栏 */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  align-items: start;
}

.page-about .about-fig {
  margin: 0;
}

.page-about .about-fig--band {
  margin-top: clamp(20px, 4vw, 36px);
}

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

/* 原则大字块 */
.page-about .about-principle {
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: clamp(18px, 3vw, 32px) clamp(16px, 3vw, 28px);
  border-left: 3px solid var(--c-grass);
  background: linear-gradient(90deg, rgba(154, 211, 107, .1), transparent 72%);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.6vw, 34px);
  line-height: 1.4;
  letter-spacing: -.02em;
  color: var(--c-grass);
}

/* 团队四象限 */
.page-about .about-team__grid {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  position: relative;
  padding: clamp(16px, 2.6vw, 22px);
  background: var(--c-pitch);
  border: 1px solid var(--line-soft);
  border-radius: 4px 18px 4px 18px;
  transition: transform var(--dur-mid) var(--ease), border-color var(--dur-mid) var(--ease), background var(--dur-mid) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-hard);
  background: var(--c-board);
}

.page-about .about-role__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-grass);
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 18px);
  letter-spacing: -.01em;
  color: var(--ink-1);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-3);
}

/* 版本档案 */
.page-about .about-versions {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-color: var(--line-mid) transparent;
}

.page-about .about-versions > li {
  flex: 0 0 min(320px, 84vw);
  scroll-snap-align: start;
}

.page-about .about-version {
  position: relative;
  height: 100%;
  padding: clamp(18px, 2.6vw, 24px);
  background: linear-gradient(160deg, var(--c-pitch), var(--c-night));
  border: 1px solid var(--line-soft);
  border-radius: 18px 4px 18px 4px;
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-grass), transparent);
}

.page-about .about-version--current {
  border-color: var(--c-yellow);
  background: linear-gradient(160deg, var(--c-board), var(--c-night));
}

.page-about .about-version--current::before {
  background: linear-gradient(90deg, var(--c-yellow), transparent);
}

.page-about .about-version__num {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-grass);
}

.page-about .about-version--current .about-version__num {
  color: var(--c-yellow);
}

.page-about .about-version__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(15px, 1.8vw, 17px);
  color: var(--ink-1);
}

.page-about .about-version p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-3);
}

/* 服务信息 */
.page-about .about-meta {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-meta__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-meta__row dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--ink-3);
}

.page-about .about-meta__row dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-1);
  overflow-wrap: anywhere;
}

/* 合作方式 */
.page-about .about-coop {
  display: grid;
  gap: 12px;
}

.page-about .about-coop__card {
  display: block;
  position: relative;
  padding: clamp(16px, 2.6vw, 24px);
  background: var(--c-pitch);
  border: 1px solid var(--line-soft);
  border-radius: 4px 18px 4px 18px;
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur-mid) var(--ease), border-color var(--dur-mid) var(--ease), background var(--dur-mid) var(--ease);
}

.page-about .about-coop__card:hover,
.page-about .about-coop__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--c-grass);
  background: var(--c-board);
}

.page-about .about-coop__k {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-grass);
}

.page-about .about-coop__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 18px);
  color: var(--ink-1);
}

.page-about .about-coop__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-3);
}

.page-about .about-coop__more {
  display: block;
  margin-top: 14px;
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--c-grass);
}

/* 联系入口 */
.page-about .about-contact {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
  padding: clamp(20px, 4vw, 36px);
  background: var(--glass-pod);
  border: 1px solid var(--line-mid);
  border-radius: var(--cut-md) var(--cut-sm) var(--cut-md) var(--cut-sm);
  scroll-margin-top: 96px;
}

.page-about .about-contact__text h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.4vw, 22px);
  letter-spacing: -.01em;
  color: var(--ink-1);
}

.page-about .about-contact__text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-contact__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-contact__btn {
  justify-self: start;
}

.page-about .contact-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.75;
  color: var(--ink-3);
}

/* 断点 */
@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-split--meta {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-contact__btn {
    grid-column: 1 / -1;
  }

  .page-about .contact-note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-versions > li {
    flex: 0 0 calc((100% - 28px) / 3);
    min-width: 0;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

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

  .page-about .about-index__list a {
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 1px solid var(--line-soft);
    border-radius: 0;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--c-grass);
  }

  .page-about .about-sec__vert {
    display: block;
    margin-left: auto;
    writing-mode: vertical-rl;
    font-family: var(--font-num);
    font-size: 10px;
    letter-spacing: .34em;
    color: var(--ink-3);
  }
}

@media (min-width: 1200px) {
  .page-about .about-sec__body > p {
    font-size: 16px;
  }

  .page-about .about-role__desc,
  .page-about .about-coop__desc,
  .page-about .about-version p {
    font-size: 14px;
  }
}

@supports not ((-webkit-text-stroke: 1px #000)) {
  .page-about .about-sec__num {
    color: var(--line-hard);
    -webkit-text-stroke: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-coop__card,
  .page-about .about-index__list a {
    transition: color var(--dur-fast) linear, background-color var(--dur-fast) linear, border-color var(--dur-fast) linear;
  }

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