/* ============ 页面作用域变量 ============ */
.page-about {
  --about-y: clamp(52px, 8vw, 108px);
  --about-gap: clamp(24px, 4vw, 52px);
}

/* ============ 面包屑 ============ */
.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: 0;
  font-size: 13px;
}

/* ============ 首屏声明区 ============ */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 62px) 0 clamp(34px, 6vw, 70px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  right: -22%;
  top: -46%;
  width: 68vw;
  height: 68vw;
  max-width: 640px;
  max-height: 640px;
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-masthead-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-eyebrow {
  margin: 0 0 16px;
}

.page-about .about-h1 {
  margin: 0;
  font-size: clamp(32px, 6.6vw, 68px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--bone);
  max-width: 17em;
}

.page-about .about-lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 40em;
  color: var(--mist);
}

/* ---- 目录 ---- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

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

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: var(--bone);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.4;
  transition: color 200ms var(--ease), padding-left 200ms var(--ease);
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--gold);
  padding-left: 8px;
}

.page-about .about-index-list .mono {
  font-size: 12px;
  color: var(--gold-deep);
  letter-spacing: 0.06em;
}

/* ============ 首屏通栏图 ============ */
.page-about .about-band {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

.page-about .about-band-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(190px, 34vw, 420px);
  object-fit: cover;
  opacity: 0.82;
  filter: saturate(0.85) contrast(1.06);
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(10, 26, 22, 0.9) 0%, rgba(10, 26, 22, 0.22) 52%, rgba(10, 26, 22, 0.78) 100%);
}

/* ============ 通用章节 ============ */
.page-about .about-section {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--tight {
  padding-top: clamp(46px, 6.5vw, 84px);
  padding-bottom: clamp(46px, 6.5vw, 84px);
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-kicker::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.page-about .about-kicker-no {
  color: var(--gold);
  font-size: 13px;
}

.page-about .about-title {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 22em;
  color: var(--bone);
}

.page-about .about-head {
  max-width: 46em;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .about-head-lede {
  margin: 0;
  color: var(--mist);
}

.page-about .about-inline-links {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-inline-links a {
  color: var(--aqua);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, 0.35);
}

.page-about .about-inline-links a:hover,
.page-about .about-inline-links a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold-deep);
}

.page-about .about-narrow {
  max-width: 860px;
}

/* ============ 01 品牌起点：7/5 分栏 ============ */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .about-split-main .prose + .prose {
  margin-top: 1.1em;
}

.page-about .about-split-aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-fact {
  background: var(--panel);
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  position: relative;
  overflow: hidden;
}

.page-about .about-fact::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--gold) 0%, var(--gold-deep) 100%);
  opacity: 0.7;
}

.page-about .about-fact-num {
  font-size: clamp(30px, 4.4vw, 42px);
  line-height: 1;
  font-weight: 500;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about .about-fact-unit {
  font-size: 14px;
  color: var(--gold-deep);
}

.page-about .about-fact-label {
  flex: 1 0 100%;
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ============ 02 记录三步 ============ */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-step {
  background: var(--panel-2);
  padding: clamp(22px, 3vw, 34px);
  position: relative;
  transition: background 220ms var(--ease);
}

.page-about .about-step:hover {
  background: var(--panel);
}

.page-about .about-step-no {
  display: inline-block;
  margin-bottom: 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--aqua);
}

.page-about .about-step-title {
  margin: 0 0 10px;
  color: var(--bone);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ============ 03 团队 ============ */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
  margin-bottom: clamp(34px, 5vw, 58px);
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .about-team-caption {
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-team-copy .prose + .prose {
  margin-top: 1.1em;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-role {
  background: var(--panel);
  padding: clamp(20px, 2.6vw, 28px);
  min-height: 220px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: var(--glass-strong);
}

.page-about .about-role-no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-deep);
}

.page-about .about-role-title {
  margin: 0;
  color: var(--bone);
}

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

.page-about .about-role-tag {
  margin-top: auto;
  align-self: flex-start;
  padding: 5px 10px;
  border: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--aqua);
}

/* ============ 04 版本迭代 ============ */
.page-about .about-versions-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-spine {
  position: relative;
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.page-about .about-version {
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  left: calc(-22px - 5px);
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--panel-2);
  border: 1px solid var(--gold-deep);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-version[open]::before,
.page-about .about-version:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(232, 176, 75, 0.14);
}

.page-about .about-version-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-version-head:focus-visible {
  outline: 1px solid var(--aqua);
  outline-offset: 4px;
}

.page-about .about-version-no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-version-name {
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  color: var(--bone);
  letter-spacing: -0.01em;
}

.page-about .about-version-toggle {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .about-version-toggle::before,
.page-about .about-version-toggle::after {
  content: "";
  position: absolute;
  background: var(--mist);
  transition: transform 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-version-toggle::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .about-version-toggle::after {
  left: 6px;
  top: 0;
  width: 1px;
  height: 14px;
}

.page-about .about-version[open] .about-version-toggle::after {
  transform: scaleY(0);
}

.page-about .about-version[open] .about-version-toggle::before {
  background: var(--gold);
}

.page-about .about-version-body {
  padding: 0 0 22px;
  max-width: 40em;
}

.page-about .about-version-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-versions-aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-versions-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel-2);
  overflow: hidden;
}

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

.page-about .about-versions-note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold-deep);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-aside-link {
  align-self: flex-start;
}

/* ============ 05 合作生态 ============ */
.page-about .about-eco-list {
  list-style: none;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 18px 4px;
  background: var(--ink);
}

.page-about .about-eco-key {
  font-size: 12px;
  color: var(--gold-deep);
  letter-spacing: 0.12em;
}

.page-about .about-eco-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-eco-list strong {
  color: var(--bone);
  font-weight: 700;
}

/* ============ 06 品牌主张 ============ */
.page-about .about-cta {
  border-bottom: none;
}

.page-about .about-cta-inner {
  position: relative;
  padding: clamp(40px, 6vw, 76px) clamp(22px, 4vw, 56px);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 88% 12%, rgba(232, 176, 75, 0.12) 0%, rgba(232, 176, 75, 0) 58%),
    linear-gradient(160deg, var(--panel) 0%, var(--panel-2) 100%);
  overflow: hidden;
}

.page-about .about-cta-inner::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -110px;
  width: 240px;
  height: 240px;
  border: 1px solid var(--gold-deep);
  border-radius: 50%;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-cta-title {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 20em;
  color: var(--bone);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 38em;
  color: var(--mist);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 3.6vw, 40px);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .about-split-aside {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-masthead-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(230px, 0.72fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-split-aside {
    grid-template-columns: 1fr;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-team-figure img {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-versions-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(34px, 5vw, 68px);
  }
}

@media (min-width: 1060px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-step {
    padding: clamp(26px, 2.6vw, 36px);
  }

  .page-about .about-role {
    min-height: 260px;
  }
}
<<<END>>>