.page-about {
  color: var(--color-ink);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ===== 顶部上下文条 ===== */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(138,143,152,.25);
}

.page-about .about-topbar__code {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--color-stone);
}

/* ===== 品牌宣言 ===== */
.page-about .about-declaration {
  position: relative;
  background: var(--color-deep-space);
  color: var(--color-snow);
  overflow: hidden;
}

.page-about .about-declaration__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-declaration__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
  display: block;
}

.page-about .about-declaration__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(11,31,58,.95) 0%, rgba(11,31,58,.72) 50%, rgba(26,43,76,.4) 100%);
}

.page-about .about-declaration__inner {
  position: relative;
  z-index: 1;
  padding: 3.5rem 0;
  max-width: 780px;
}

.page-about .about-declaration__inner .section-heading__eyebrow {
  color: var(--color-light-gold);
}

.page-about .about-declaration h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.5vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  margin: .75rem 0 1.25rem;
}

.page-about .about-declaration__lead {
  font-size: 1.05rem;
  line-height: 1.75;
  color: rgba(247,249,252,.85);
  margin-bottom: 2rem;
  max-width: 720px;
}

.page-about .about-declaration__meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  margin: 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid rgba(247,249,252,.15);
}

@media (min-width: 600px) {
  .page-about .about-declaration__meta {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .about-declaration__meta-item {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.page-about .about-declaration__meta-item dt {
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: rgba(247,249,252,.55);
}

.page-about .about-declaration__meta-item dd {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0;
  color: var(--color-gold);
}

/* ===== 平台使命 ===== */
.page-about .about-mission {
  padding: 3.5rem 0;
}

.page-about .about-mission__grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .page-about .about-mission__grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 3rem;
  }
}

.page-about .about-mission__lead h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin: .75rem 0 1.25rem;
}

.page-about .about-mission__lead p {
  color: var(--color-stone);
  line-height: 1.75;
}

.page-about .about-mission__principles {
  display: grid;
  gap: 1rem;
}

.page-about .about-mission__principle {
  position: relative;
  background: var(--color-snow);
  border: 1px solid rgba(138,143,152,.25);
  border-left: 3px solid var(--color-gold);
  padding: 1.5rem 1.5rem 1.5rem 3.25rem;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-mission__principle:hover {
  border-left-color: var(--color-terra);
  box-shadow: var(--shadow);
}

.page-about .about-mission__num {
  position: absolute;
  top: 1.35rem;
  left: 1.15rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .85rem;
  color: var(--color-gold);
}

.page-about .about-mission__principle h3 {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
}

.page-about .about-mission__principle p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--color-stone);
}

/* ===== 发展足迹 ===== */
.page-about .about-journey {
  background: linear-gradient(180deg, rgba(247,249,252,.6) 0%, rgba(247,249,252,.95) 100%);
  padding: 4rem 0;
}

.page-about .about-journey__layout {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

@media (min-width: 992px) {
  .page-about .about-journey__layout {
    grid-template-columns: 1.55fr 1fr;
    gap: 3rem;
    align-items: start;
  }
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-deep-space) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2rem 2.5rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--color-gold);
  border: 2px solid var(--color-deep-space);
  transform: rotate(45deg);
  box-sizing: border-box;
  transition: background-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--color-terra);
  transform: rotate(45deg) scale(1.15);
}

.page-about .about-timeline__marker {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: .08em;
  color: var(--color-gold);
  background: rgba(212,175,55,.12);
  padding: .2rem .6rem;
  margin-bottom: .5rem;
}

.page-about .about-timeline__card {
  background: var(--color-snow);
  border-left: 3px solid var(--color-gold);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 3px 14px rgba(10,14,23,.05);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-timeline__card:hover {
  border-left-color: var(--color-terra);
  box-shadow: var(--shadow);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--color-stone);
}

.page-about .about-journey__visual {
  position: relative;
  background: var(--color-deep-space);
  border: 1px solid rgba(138,143,152,.3);
  overflow: hidden;
}

.page-about .about-journey__visual img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 480px;
  max-height: 720px;
  object-fit: cover;
}

/* ===== 数据与规模 ===== */
.page-about .about-stats {
  background: linear-gradient(135deg, var(--color-deep-space) 0%, var(--color-deep-space-2) 100%);
  color: var(--color-snow);
  padding: 4.5rem 0;
}

.page-about .about-stats .section-heading__eyebrow {
  color: var(--color-light-gold);
}

.page-about .about-stats .section-heading--light h2 {
  color: var(--color-snow);
}

.page-about .about-stats__grid {
  display: grid;
  gap: 1rem;
  margin-top: 2.5rem;
}

@media (min-width: 640px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .about-stat {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.12);
  padding: 2rem 1.75rem;
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-stat:hover {
  border-color: rgba(212,175,55,.55);
  background: rgba(255,255,255,.08);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.2rem, 3vw, 3.25rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--color-gold);
  transition: color .25s var(--ease);
}

.page-about .about-stat:hover .about-stat__num {
  color: var(--color-light-gold);
}

.page-about .about-stat__label {
  display: block;
  margin-top: .75rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-snow);
}

.page-about .about-stat p {
  margin: .5rem 0 0;
  font-size: .85rem;
  line-height: 1.6;
  color: rgba(247,249,252,.7);
}

/* ===== 安全与合规 ===== */
.page-about .about-security {
  padding: 4.5rem 0;
}

.page-about .about-security__grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 992px) {
  .page-about .about-security__grid {
    grid-template-columns: .9fr 1.1fr;
    gap: 3.5rem;
    align-items: start;
  }
}

.page-about .about-security__intro h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin: .75rem 0 1rem;
}

.page-about .about-security__intro > p {
  color: var(--color-stone);
  line-height: 1.7;
}

.page-about .about-security__links {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin-top: 1.5rem;
}

.page-about .about-security__links a {
  color: var(--color-deep-space);
  font-weight: 600;
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
}

.page-about .about-security__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(1);
  transform-origin: left;
  transition: transform .25s var(--ease);
}

.page-about .about-security__links a:hover::after {
  transform: scaleX(0);
  transform-origin: right;
}

.page-about .about-security__matrix {
  display: grid;
  gap: 1rem;
}

@media (min-width: 600px) {
  .page-about .about-security__matrix {
    grid-template-columns: repeat(2, 1fr);
  }
}

.page-about .about-security__item {
  background: var(--color-snow);
  border: 1px solid rgba(138,143,152,.3);
  padding: 1.75rem 1.5rem;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-security__item:hover {
  border-color: var(--color-gold);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.page-about .about-security__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 1rem;
  background: var(--color-deep-space);
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .08em;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-about .about-security__item h3 {
  margin: 0 0 .5rem;
  font-size: 1rem;
}

.page-about .about-security__item p {
  margin: 0;
  font-size: .85rem;
  line-height: 1.6;
  color: var(--color-stone);
}

/* ===== 合作伙伴 ===== */
.page-about .about-partners {
  background: linear-gradient(180deg, rgba(247,249,252,.6) 0%, rgba(247,249,252,.9) 100%);
  padding: 4.5rem 0;
}

.page-about .about-partners__layout {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

@media (min-width: 992px) {
  .page-about .about-partners__layout {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
  }
}

.page-about .about-partners__list {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-partners__type {
  background: var(--color-snow);
  border-left: 3px solid var(--color-gold);
  padding: 1.75rem 1.5rem;
  transition: border-left-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-partners__type:hover {
  border-left-color: var(--color-moss);
  box-shadow: var(--shadow);
}

.page-about .about-partners__type h3 {
  margin: 0 0 .5rem;
  font-size: 1.05rem;
}

.page-about .about-partners__type p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--color-stone);
}

.page-about .about-partners__visual {
  background: var(--color-deep-space);
  border: 1px solid rgba(138,143,152,.3);
  overflow: hidden;
}

.page-about .about-partners__visual img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 260px;
  max-height: 420px;
  object-fit: cover;
}

/* ===== 了解更多 ===== */
.page-about .about-more {
  padding: 4.5rem 0;
}

.page-about .about-more__card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--color-snow);
  border: 1px solid rgba(138,143,152,.3);
  box-shadow: var(--shadow);
  padding: 2.5rem 2rem;
}

@media (min-width: 768px) {
  .page-about .about-more__card {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
  }
}

.page-about .about-more__card h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -.02em;
  margin: .5rem 0 0;
}

.page-about .about-more__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  flex-shrink: 0;
}