.page-about {
  --about-gap: clamp(20px, 3vw, 34px);
  --about-dot: 14px;
}

/* 深色分区内的文字基准 */
.page-about .band--ink,
.page-about .band--indigo,
.page-about .band--teal {
  color: var(--oninverse);
}

.page-about .band--ink .muted,
.page-about .band--indigo .muted,
.page-about .band--teal .muted,
.page-about .band--ink .section-head__note,
.page-about .band--indigo .section-head__note,
.page-about .band--teal .section-head__note {
  color: var(--oninverse-muted);
}

.page-about .band--ink .breadcrumb__link,
.page-about .band--ink .breadcrumb__item,
.page-about .band--ink .breadcrumb__item span {
  color: var(--oninverse-muted);
}

.page-about .band--ink .breadcrumb__link:hover {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(40px, 7vw, 88px) clamp(52px, 8vw, 112px);
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 8%;
  width: 52vw;
  height: 52vw;
  max-width: 720px;
  max-height: 720px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(46, 123, 255, 0.28), rgba(46, 123, 255, 0) 62%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  margin-top: clamp(20px, 3vw, 36px);
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  color: var(--oninverse);
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(40px, 10.5vw, 112px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 34px) 0 0;
  max-width: 60ch;
  color: var(--oninverse);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px clamp(24px, 5vw, 64px);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 120px;
}

.page-about .about-hero__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .about-hero__fact-label {
  font-size: 14px;
  color: var(--oninverse-muted);
}

/* ---------- 首屏通栏图 ---------- */
.page-about .about-figure {
  padding-block: clamp(40px, 6vw, 80px);
}

.page-about .about-figure__frame {
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  margin: 0;
}

.page-about .about-figure__frame img,
.page-about .about-quality__figure img,
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 目录 ---------- */
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

@media (min-width: 760px) {
  .page-about .about-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

.page-about .about-index__list .index-list__link {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: baseline;
  gap: 4px 12px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--text-strong);
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .about-index__list .index-list__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--electric-ink);
}

.page-about .about-index__list .index-list__meta {
  grid-column: 2;
  font-size: 14px;
  color: var(--text-muted);
}

.page-about .about-index__list .index-list__link:hover,
.page-about .about-index__list .index-list__link[aria-current="true"] {
  color: var(--electric-ink);
  border-bottom-color: var(--gold);
}

/* ---------- 通用双栏 ---------- */
.page-about .about-split,
.page-about .about-quality,
.page-about .about-users,
.page-about .about-next__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-prose > .prose:first-child {
  margin-top: 0;
}

@media (min-width: 900px) {
  .page-about .about-split,
  .page-about .about-quality,
  .page-about .about-users,
  .page-about .about-next__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-split .span-7 { grid-column: 1 / span 7; }
  .page-about .about-split .span-4 { grid-column: 9 / span 4; }

  .page-about .about-quality .span-5 { grid-column: 1 / span 5; }
  .page-about .about-quality .span-6 { grid-column: 7 / span 6; }

  .page-about .about-users .span-5:first-child { grid-column: 1 / span 5; }
  .page-about .about-users .span-5:last-child { grid-column: 7 / span 5; }

  .page-about .about-next__grid .span-6 { grid-column: 1 / span 6; }
  .page-about .about-next__grid .span-5 { grid-column: 8 / span 5; }
}

/* ---------- 侧栏卡 ---------- */
.page-about .about-aside {
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--r-lg);
  align-self: start;
}

.page-about .about-aside__title {
  margin: 0 0 14px;
}

.page-about .about-aside__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-aside__list li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-strong);
}

.page-about .about-aside__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--electric);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 clamp(36px, 5vw, 64px);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

.page-about .phases {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .phases::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 22px;
  bottom: 22px;
  width: 0;
  border-left: 2px dashed rgba(242, 193, 78, 0.45);
}

.page-about .phase {
  position: relative;
  padding-left: 34px;
}

.page-about .phase::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 30px;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(242, 193, 78, 0.16);
}

.page-about .phase__year {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--gold);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .phase__body {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-lg);
  background: var(--surface);
  color: var(--text-strong);
}

.page-about .phase__body .chip {
  margin-bottom: 12px;
}

.page-about .phase__body .h3 {
  margin: 0 0 8px;
  color: var(--text-strong);
}

.page-about .phase__text {
  margin: 0 0 14px;
  color: var(--text-muted);
  line-height: 1.75;
}

.page-about .phase__body .fold summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--electric-ink);
  padding: 6px 0;
}

.page-about .phase__body .fold__body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
  padding-top: 6px;
}

@media (min-width: 900px) {
  .page-about .phases::before {
    left: 143px;
    border-left-color: rgba(242, 193, 78, 0.4);
  }

  .page-about .phase {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 24px;
    padding-left: 0;
  }

  .page-about .phase::before {
    left: 137px;
    top: 38px;
  }

  .page-about .phase__year {
    text-align: right;
    margin: 26px 0 0;
    color: var(--gold);
  }

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

  .page-about .phase__body::before {
    content: "";
    position: absolute;
    right: 100%;
    top: 46px;
    width: 11px;
    border-top: 2px dashed rgba(242, 193, 78, 0.45);
  }

  .page-about .phase:nth-child(even) .phase__body {
    margin-right: clamp(0px, 4vw, 56px);
  }
}

/* ---------- 团队 ---------- */
.page-about .roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--about-gap);
}

.page-about .role {
  padding: clamp(22px, 3vw, 32px);
  border-radius: var(--r-lg);
}

.page-about .role__no {
  display: block;
  font-size: 13px;
  color: var(--gold);
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

.page-about .role__name {
  margin: 0 0 10px;
}

.page-about .role__desc {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.8;
}

@media (min-width: 900px) {
  .page-about .roles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .role:nth-child(1) { grid-column: 1 / span 6; }
  .page-about .role:nth-child(2) { grid-column: 8 / span 5; margin-top: 42px; }
  .page-about .role:nth-child(3) { grid-column: 3 / span 6; margin-top: 8px; }
}

/* ---------- 质量 ---------- */
.page-about .about-quality__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-1);
  align-self: start;
}

/* ---------- 合作与资质 ---------- */
.page-about .about-eco {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-eco__item {
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(237, 240, 250, 0.16);
}

.page-about .about-eco__num {
  display: block;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .about-eco__item .h3 {
  margin: 0 0 10px;
  color: var(--oninverse);
}

.page-about .about-eco__item p {
  margin: 0;
  color: var(--oninverse-muted);
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-eco__cta {
  margin: clamp(28px, 4vw, 44px) 0 0;
  color: var(--oninverse-muted);
}

.page-about .about-eco__cta .link {
  color: var(--gold);
}

@media (min-width: 900px) {
  .page-about .about-eco {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-eco__item:nth-child(1) { grid-column: 1 / span 5; }
  .page-about .about-eco__item:nth-child(2) { grid-column: 6 / span 4; }
  .page-about .about-eco__item:nth-child(3) { grid-column: 10 / span 3; }
}

/* ---------- 用户 ---------- */
.page-about .statlist {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .statlist__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .statlist__row dt {
  font-size: 15px;
  color: var(--text-muted);
}

.page-about .statlist__row dd {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-users__cases .h3 {
  margin: 0 0 16px;
}

.page-about .cases {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .cases__item {
  padding-left: 18px;
  border-left: 2px solid var(--line);
  transition: border-color 200ms var(--ease);
}

.page-about .cases__item:hover {
  border-left-color: var(--gold);
}

.page-about .cases__item p {
  margin: 8px 0 0;
  color: var(--text-muted);
  line-height: 1.8;
  font-size: 15px;
}

.page-about .about-users__cases .prose {
  margin-top: 24px;
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding-block: clamp(64px, 9vw, 132px);
}

.page-about .about-next__title {
  margin: 0 0 16px;
  color: var(--oninverse);
}

.page-about .about-next__text {
  margin: 0;
  color: var(--oninverse-muted);
  line-height: 1.8;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
  align-items: flex-start;
}

@media (min-width: 900px) {
  .page-about .about-next__links {
    flex-direction: column;
    align-items: stretch;
  }
}