.page-about {
  --about-rule: rgba(58, 63, 68, .14);
  --about-rule-dark: rgba(199, 205, 212, .2);
  --about-soft: rgba(58, 63, 68, .7);
  background: var(--paper);
  color: var(--stone);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--masthead-total) + 34px) 0 0;
  background:
    radial-gradient(120% 95% at 84% 6%, rgba(30, 58, 95, .92) 0%, rgba(11, 31, 58, 0) 62%),
    linear-gradient(168deg, var(--night) 0%, #10243c 44%, var(--grass) 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  bottom: -140px;
  height: 260px;
  border-radius: 50% 50% 0 0;
  background: linear-gradient(to bottom, rgba(107, 143, 113, .3), rgba(107, 143, 113, 0));
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-bottom: 56px;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 30px;
  color: rgba(244, 241, 232, .62);
  font-size: 13px;
}

.page-about .about-hero .breadcrumbs__link {
  color: rgba(244, 241, 232, .88);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

.page-about .about-hero .breadcrumbs__link:hover,
.page-about .about-hero .breadcrumbs__link:focus-visible {
  border-bottom-color: var(--accent);
}

.page-about .about-hero .breadcrumbs__sep {
  margin: 0 8px;
  color: rgba(244, 241, 232, .4);
}

.page-about .about-hero .eyebrow {
  color: var(--moss);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 241, 232, .82);
}

.page-about .about-hero__card {
  padding: 22px 22px 24px;
  border: 1px solid var(--about-rule-dark);
}

.page-about .about-hero__card-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 14px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  display: block;
  padding-top: 10px;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-fact__num {
  display: block;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(244, 241, 232, .62);
}

/* ---------- 通用标题与正文 ---------- */
.page-about .about-h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.008em;
  color: var(--grass);
}

.page-about .about-h2--light {
  color: var(--paper);
}

.page-about .about-h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--grass);
}

.page-about .about-prose p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-soft);
}

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

.page-about .about-link {
  color: var(--grass-2);
  text-decoration: none;
  border-bottom: 1px solid var(--moss);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--grass);
  border-bottom-color: var(--accent);
}

.page-about .about-link--strong {
  display: inline-block;
  margin-top: 12px;
  font-weight: 700;
  font-size: 15px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 40px;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  background: linear-gradient(135deg, var(--night-2), var(--moss));
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(58, 63, 68, .58);
}

.page-about .about-figure--dark .about-figure__cap {
  color: rgba(244, 241, 232, .55);
}

/* ---------- 章节间距 ---------- */
.page-about .about-origin {
  padding-top: 56px;
  padding-bottom: 64px;
}

.page-about .about-origin__grid {
  align-items: start;
}

.page-about .about-aside {
  border-left: 2px solid var(--moss);
  padding-left: 18px;
}

.page-about .about-aside__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-aside__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(58, 63, 68, .72);
}

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

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  padding-top: 60px;
  padding-bottom: 64px;
  background: var(--grass);
  color: var(--paper);
}

.page-about .about-versions__head {
  max-width: 720px;
  margin-bottom: 32px;
}

.page-about .about-versions .eyebrow {
  color: var(--moss);
}

.page-about .about-versions__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(244, 241, 232, .78);
}

.page-about .about-versions__body {
  display: grid;
  gap: 28px;
}

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

.page-about .about-rail {
  margin: 14px 0 0;
  padding: 0 0 0 16px;
  list-style: none;
  border-left: 1px solid var(--about-rule-dark);
}

.page-about .about-rail__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 9px 0;
}

.page-about .about-rail__code {
  min-width: 58px;
  font-size: 12px;
  color: var(--moss);
}

.page-about .about-rail__name {
  font-size: 14px;
  color: rgba(244, 241, 232, .86);
}

.page-about .about-rail__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(244, 241, 232, .5);
}

.page-about .ver {
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .ver:last-child {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .ver__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ver__summary:hover .ver__title,
.page-about .ver__summary:focus-visible .ver__title {
  color: var(--accent);
}

.page-about .ver__summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-about .ver__code {
  flex: 0 0 auto;
  min-width: 52px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--moss);
}

.page-about .ver__title {
  flex: 1 1 auto;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: color .2s var(--ease);
}

.page-about .ver__sign {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid var(--about-rule-dark);
  border-radius: var(--radius);
}

.page-about .ver__sign::before,
.page-about .ver__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--silver);
  transform: translate(-50%, -50%);
}

.page-about .ver__sign::before {
  width: 8px;
  height: 1px;
}

.page-about .ver__sign::after {
  width: 1px;
  height: 8px;
  transition: opacity .2s var(--ease);
}

.page-about .ver[open] .ver__sign::after {
  opacity: 0;
}

.page-about .ver[open] .ver__sign {
  border-color: var(--accent);
}

.page-about .ver[open] .ver__sign::before {
  background: var(--accent);
}

.page-about .ver[open] .ver__title {
  color: var(--paper);
}

.page-about .ver__body {
  padding: 0 0 20px;
  border-left: 2px solid rgba(107, 143, 113, .5);
  padding-left: 14px;
  margin-bottom: 6px;
}

.page-about .ver[open] .ver__body {
  border-left-color: var(--accent);
}

.page-about .ver__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 241, 232, .76);
}

.page-about .ver__body .about-link {
  color: var(--moss);
  border-bottom-color: rgba(107, 143, 113, .7);
}

.page-about .ver__body .about-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-top: 60px;
  padding-bottom: 64px;
}

.page-about .about-team__top {
  align-items: start;
  margin-bottom: 36px;
}

.page-about .about-team__media {
  margin-top: 8px;
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  background: linear-gradient(140deg, var(--night), var(--moss));
}

.page-about .about-roles {
  display: grid;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about .about-role {
  padding: 20px 20px 22px;
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--moss);
  background: rgba(255, 255, 255, .5);
  transition: border-top-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-role:hover {
  border-top-color: var(--accent);
  background: rgba(255, 255, 255, .82);
}

.page-about .about-role__idx {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-role__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--grass);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-methods {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-method {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-method__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--grass-2);
}

.page-about .about-method__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  padding-top: 60px;
  padding-bottom: 64px;
  background:
    repeating-linear-gradient(135deg, rgba(107, 143, 113, .06) 0 1px, transparent 1px 22px),
    var(--paper);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-partners__head {
  max-width: 700px;
  margin-bottom: 32px;
}

.page-about .about-partners__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-badges {
  display: grid;
  gap: 14px;
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
}

.page-about .about-badge {
  display: grid;
  grid-template-columns: 34px 1fr;
  grid-template-rows: auto auto;
  gap: 2px 12px;
  align-items: center;
  padding: 16px 16px 16px 14px;
  border: 1px solid var(--about-rule);
  background: rgba(244, 241, 232, .7);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-badge:hover {
  border-color: var(--moss);
  transform: translateY(-2px);
}

.page-about .about-badge__mark {
  grid-row: 1 / span 2;
  width: 28px;
  height: 28px;
  border: 1px solid var(--grass);
  background:
    linear-gradient(135deg, transparent 46%, var(--moss) 46% 54%, transparent 54%),
    linear-gradient(45deg, var(--night) 0 48%, transparent 48%);
  transform: rotate(45deg);
}

.page-about .about-badge__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--grass);
}

.page-about .about-badge__desc {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(58, 63, 68, .68);
}

.page-about .about-partners__bottom {
  align-items: start;
}

.page-about .about-honors {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honors li {
  position: relative;
  padding: 12px 0 12px 20px;
  border-bottom: 1px solid var(--about-rule);
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-honors li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 8px;
  background: var(--clay);
}

.page-about .about-partners__aside {
  margin-top: 28px;
  padding: 20px 20px 22px;
  border: 1px solid var(--about-rule);
  background: rgba(255, 255, 255, .6);
}

/* ---------- 合作路径 ---------- */
.page-about .about-start {
  padding-top: 60px;
  padding-bottom: 72px;
}

.page-about .about-start__lede {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-steps {
  margin: 0 0 8px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-step__idx {
  padding-top: 3px;
  font-size: 13px;
  color: var(--clay);
}

.page-about .about-step__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--grass);
}

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

.page-about .about-cta {
  display: grid;
  gap: 28px;
  margin-top: 44px;
  padding: 28px 22px 30px;
  color: var(--paper);
}

.page-about .about-cta__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--moss);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 27px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 241, 232, .76);
}

.page-about .about-contact {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-contact__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-contact__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--moss);
}

.page-about .about-contact__value {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 241, 232, .88);
  word-break: break-word;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-badges {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-contact__row {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--masthead-total) + 46px);
  }

  .page-about .about-hero__inner {
    padding-bottom: 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-origin {
    padding-top: 72px;
    padding-bottom: 84px;
  }

  .page-about .about-figure {
    margin-bottom: 52px;
  }

  .page-about .about-versions {
    padding-top: 76px;
    padding-bottom: 84px;
  }

  .page-about .about-versions__head {
    margin-bottom: 40px;
  }

  .page-about .about-versions__body {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-versions__rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--masthead-total) + 28px);
  }

  .page-about .about-team {
    padding-top: 76px;
    padding-bottom: 84px;
  }

  .page-about .about-team__top {
    margin-bottom: 48px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-bottom: 48px;
  }

  .page-about .about-methods {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .about-method {
    border-bottom: none;
    padding: 22px 0 4px;
  }

  .page-about .about-partners {
    padding-top: 76px;
    padding-bottom: 84px;
  }

  .page-about .about-badges {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-badge {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: 8px;
    padding: 22px 18px 24px;
  }

  .page-about .about-badge__mark {
    grid-row: auto;
    margin-bottom: 6px;
  }

  .page-about .about-partners__aside {
    margin-top: 0;
  }

  .page-about .about-start {
    padding-top: 76px;
    padding-bottom: 96px;
  }

  .page-about .about-step {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 56px;
    padding: 44px 48px 46px;
    margin-top: 56px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-prose p {
    font-size: 16.5px;
  }

  .page-about .about-versions__body {
    grid-template-columns: 268px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-badge,
  .page-about .ver__title,
  .page-about .about-link,
  .page-about .about-hero .breadcrumbs__link {
    transition: none;
  }

  .page-about .about-badge:hover {
    transform: none;
  }
}