.page-about {
  display: block;
  background: var(--cool);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 20px 0 44px;
  background: linear-gradient(180deg, var(--paper) 0%, var(--cool) 100%);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(45deg, rgba(22, 53, 92, .05) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(-45deg, rgba(22, 53, 92, .05) 0 1px, transparent 1px 22px);
  -webkit-mask-image: linear-gradient(100deg, #000 0%, transparent 60%);
  mask-image: linear-gradient(100deg, #000 0%, transparent 60%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}
@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
    gap: 52px;
    align-items: center;
  }
}
.page-about .about-hero__media {
  position: relative;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  padding: 10px;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.page-about .about-hero__badge {
  position: absolute;
  left: 10px;
  bottom: 10px;
  background: var(--indigo-deep);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  padding: 7px 11px;
}
.page-about .about-hero__copy .eyebrow {
  color: var(--gold);
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 6.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -.03em;
  color: var(--indigo);
  margin: 12px 0 16px;
}
.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
  max-width: 40em;
  margin: 0 0 22px;
}
.page-about .about-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-facts__item {
  background: var(--paper);
  padding: 14px 16px;
}
.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--indigo);
}
.page-about .about-facts__label {
  font-size: 12.5px;
  color: var(--gray);
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: 64px;
}
@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    column-gap: 54px;
    align-items: start;
  }
}
.page-about .about-body {
  min-width: 0;
}

/* ---------- 侧边章节索引 ---------- */
.page-about .about-rail {
  border-top: 3px solid var(--gold);
  padding-top: 14px;
  margin-bottom: 8px;
}
@media (min-width: 980px) {
  .page-about .about-rail {
    position: sticky;
    top: 92px;
    margin-bottom: 0;
  }
}
.page-about .rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gray);
  margin: 0 0 10px;
}
.page-about .rail__list {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-about .rail__list::-webkit-scrollbar {
  height: 3px;
}
.page-about .rail__list::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}
@media (min-width: 980px) {
  .page-about .rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
}
.page-about .rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--gray);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
@media (min-width: 980px) {
  .page-about .rail__link {
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding: 8px 0 8px 13px;
  }
}
.page-about .rail__link:hover {
  color: var(--indigo);
}
.page-about .rail__link.is-active,
.page-about .rail__link[aria-current="true"] {
  color: var(--indigo);
  font-weight: 700;
  border-color: var(--gold);
}
.page-about .rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--gold);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 38px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-block:first-child {
  border-top: 0;
  padding-top: 4px;
}
.page-about .about-block__head {
  margin-bottom: 24px;
  max-width: 62rem;
}
.page-about .about-block__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold);
  margin-bottom: 8px;
}
.page-about .about-block .h2 {
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--indigo);
  margin: 0;
}
.page-about .about-block__note {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}
.page-about .prose p {
  font-size: 16px;
  line-height: 1.9;
  margin: 0 0 14px;
  max-width: 44em;
  color: var(--ink);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 品牌定位 ---------- */
.page-about .about-position {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 860px) {
  .page-about .about-position {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 40px;
    align-items: start;
  }
}
.page-about .about-position__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--gold);
  background: var(--paper);
  padding: 10px 10px 0;
}
.page-about .about-position__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.page-about .about-position__figure figcaption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--gray);
  padding: 10px 2px 12px;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 28px;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 12px 12px 0;
}
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}
.page-about .about-timeline__figure figcaption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--gray);
  padding: 10px 2px 12px;
}
.page-about .about-timeline {
  border-top: 1px solid var(--line-strong);
}
.page-about .about-stage {
  border-bottom: 1px solid var(--line);
}
.page-about .about-stage__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}
.page-about .about-stage__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  background: none;
  border: 0;
  text-align: left;
  padding: 18px 0;
  cursor: pointer;
  font-family: inherit;
  color: var(--indigo);
  transition: color .16s var(--ease);
}
.page-about .about-stage__trigger:hover {
  color: var(--indigo-mid);
}
.page-about .about-stage__badge {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--indigo-deep);
  background: var(--gold-light);
  border: 1px solid var(--gold);
  padding: 4px 9px;
}
.page-about .about-stage__name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(16px, 2.1vw, 19px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.45;
}
.page-about .about-stage .accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
}
.page-about .about-stage .accordion__icon::before,
.page-about .about-stage .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.page-about .about-stage .accordion__icon::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}
.page-about .about-stage .accordion__icon::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}
.page-about .about-stage__trigger[aria-expanded="true"] .accordion__icon::after {
  opacity: 0;
  transform: rotate(90deg);
}
.page-about .about-stage__panel {
  padding: 0 0 22px;
}
@media (min-width: 700px) {
  .page-about .about-stage__panel {
    padding-left: 66px;
  }
}
.page-about .about-stage__panel p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink);
  margin: 0 0 14px;
  max-width: 44em;
}
.page-about .about-stage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .about-stage__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--gray);
}
.page-about .about-stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
}

/* ---------- 内容与栏目体系 ---------- */
.page-about .filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.page-about .filter__btn {
  font-family: inherit;
  font-size: 13.5px;
  line-height: 1.4;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--gray);
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}
.page-about .filter__btn:hover {
  border-color: var(--gold);
  color: var(--indigo);
}
.page-about .filter__btn.is-active {
  background: var(--indigo);
  border-color: var(--indigo);
  color: var(--paper);
}
.page-about .about-topics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
@media (min-width: 720px) {
  .page-about .about-topics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1180px) {
  .page-about .about-topics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-topic {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--indigo-mid);
  padding: 20px 20px 18px;
  transition: border-color .16s var(--ease);
}
.page-about .about-topic:hover {
  border-left-color: var(--gold);
}
.page-about .about-topic[hidden],
.page-about .about-topic.is-hidden {
  display: none;
}
.page-about .about-topic__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: 8px;
}
.page-about .about-topic__title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--indigo);
  margin: 0 0 8px;
}
.page-about .about-topic__text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 14px;
}
.page-about .about-topic__foot {
  margin: 0;
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 24px;
}
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1180px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-team__item {
  background: var(--paper);
  padding: 22px 20px;
}
.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: 12px;
}
.page-about .about-team__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--indigo);
  margin: 0 0 8px;
}
.page-about .about-team__desc {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--gray);
  margin: 0;
}
.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-invert);
  border: 1px solid var(--indigo);
  margin-bottom: 18px;
}
@media (min-width: 700px) {
  .page-about .about-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-cadence__item {
  background: var(--indigo);
  padding: 18px 20px;
}
.page-about .about-cadence__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold-light);
  margin-bottom: 6px;
}
.page-about .about-cadence__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .86);
}
.page-about .about-process {
  margin: 0;
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  font-size: 15px;
  line-height: 1.85;
  color: var(--gray);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-block--cover {
  position: relative;
  overflow: hidden;
  border-top: 0;
  background: var(--indigo-deep);
  color: var(--paper);
  padding: 34px 24px;
}
.page-about .about-block--cover::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 1px solid rgba(232, 200, 120, .3);
  box-shadow: 0 0 0 24px rgba(232, 200, 120, .08), 0 0 0 48px rgba(232, 200, 120, .05);
  pointer-events: none;
}
.page-about .about-block--cover .about-block__index {
  color: var(--gold-light);
}
.page-about .about-block--cover .h2 {
  color: var(--paper);
}
.page-about .about-cover__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}
@media (min-width: 720px) {
  .page-about .about-cover__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px;
  }
}
.page-about .about-cover__stat {
  border-left: 2px solid var(--gold);
  padding-left: 16px;
}
.page-about .about-cover__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--gold-light);
}
.page-about .about-cover__unit {
  font-size: 14px;
  color: rgba(255, 255, 255, .76);
  margin-left: 6px;
}
.page-about .about-cover__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .84);
}
.page-about .about-cover__note {
  position: relative;
  z-index: 1;
  margin: 24px 0 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .74);
}

/* ---------- 品牌站栏目说明 ---------- */
.page-about .about-guide {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 860px) {
  .page-about .about-guide {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 36px;
    align-items: start;
  }
}
.page-about .about-guide__intro .btn {
  margin-top: 6px;
}
.page-about .about-guide__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--gold);
}
.page-about .about-guide__steps li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--paper);
  padding: 18px 18px;
}
.page-about .about-guide__step {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--gold);
  padding-top: 2px;
}
.page-about .about-guide__step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--indigo);
  margin: 0 0 6px;
}
.page-about .about-guide__step-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 860px) {
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, .8fr);
    gap: 36px;
    align-items: start;
  }
}
.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-partners__list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--jade);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}
.page-about .about-partners__list span {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--gold);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  background: var(--indigo);
  border-top: 3px solid var(--gold);
  padding: 42px 0;
  color: var(--paper);
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
  }
}
.page-about .about-cta__title {
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.24;
  letter-spacing: -.02em;
  margin: 0 0 8px;
  color: var(--paper);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .78);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}