.page-about {
  --about-rail: 210px;
  --about-gap: clamp(1.25rem, 3vw, 2.75rem);
  --about-pad: clamp(2.25rem, 6vw, 4.5rem);
  display: block;
  background-color: var(--ng-cream);
  color: var(--ng-ink);
  font-family: var(--ng-body-font);
}

.page-about .about-crumb {
  padding-top: clamp(0.9rem, 2.4vw, 1.4rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background-color: var(--ng-cream);
  background-image: linear-gradient(180deg, rgba(47, 79, 58, 0.07) 0%, rgba(244, 239, 228, 0) 55%);
  border-bottom: 1px solid var(--ng-line);
  padding: clamp(1.4rem, 3.5vw, 2.6rem) 0 clamp(2.4rem, 5vw, 4rem);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-kicker {
  margin: 0 0 0.75rem;
  font-family: var(--ng-mono-font);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ng-orange);
}

.page-about .about-kicker--cool {
  color: var(--ng-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1rem;
  font-family: var(--ng-display-font);
  font-weight: 800;
  font-size: clamp(1.85rem, 4.8vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  max-width: 20em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.6vw, 1.12rem);
  line-height: 1.85;
  color: rgba(33, 29, 24, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.2rem, 3vw, 1.9rem);
}

.page-about .about-hero__panel {
  background-color: var(--ng-moss);
  border: 1px solid var(--ng-copper);
  box-shadow: var(--ng-shadow);
  padding: clamp(1.15rem, 3vw, 1.7rem);
}

.page-about .about-stats {
  margin: 0.9rem 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: rgba(244, 239, 228, 0.2);
  border: 1px solid rgba(244, 239, 228, 0.2);
}

.page-about .about-stats__item {
  background-color: var(--ng-moss);
  padding: 0.8rem 0.85rem;
}

.page-about .about-stats__label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: rgba(244, 239, 228, 0.7);
}

.page-about .about-stats__value {
  margin: 0.3rem 0 0;
  font-family: var(--ng-mono-font);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ng-paper);
}

.page-about .about-stats__unit {
  margin-left: 0.2rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ng-cyan);
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(1.75rem, 4vw, 3.5rem);
  }
}

/* ---------- 区块骨架 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--ng-line);
}

.page-about .about-section__head {
  max-width: 64ch;
  margin-bottom: clamp(1.4rem, 3.5vw, 2.4rem);
}

.page-about .about-index {
  display: block;
  margin-bottom: 0.65rem;
  font-family: var(--ng-mono-font);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ng-orange);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--ng-display-font);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
}

.page-about .about-h3 {
  margin: 0 0 0.5rem;
  font-family: var(--ng-display-font);
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: 0.02em;
}

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-cols__body p {
  margin: 0 0 1.05rem;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.9;
}

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

.page-about .about-quote {
  margin: 0;
  padding: 1.05rem 0 1.05rem 1.15rem;
  border-left: 3px solid var(--ng-cyan);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ng-cream-1);
}

@media (min-width: 940px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-about .about-cols--reverse {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
  .page-about .about-cols--reverse .about-cols__body {
    order: 2;
  }
  .page-about .about-cols--reverse .about-cols__aside {
    order: 1;
  }
}

/* ---------- 深色与纸白分区 ---------- */
.page-about .about-section--dark {
  background-color: var(--ng-moss);
  border-top-color: var(--ng-copper);
  color: var(--ng-cream);
}

.page-about .about-section--dark .about-h2 {
  color: var(--ng-paper);
}

.page-about .about-section--dark .about-index {
  color: var(--ng-cyan);
}

.page-about .about-section--dark .about-cols__body p {
  color: rgba(244, 239, 228, 0.86);
}

.page-about .about-section--dark .ng-btn--ghost {
  border-color: var(--ng-cream-2);
  color: var(--ng-cream);
}

.page-about .about-section--paper {
  background-color: var(--ng-paper);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-milestone {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.6rem;
  padding: clamp(1.4rem, 3vw, 2.1rem) 0;
  border-top: 1px dashed var(--ng-line-strong);
}

.page-about .about-milestone:last-child {
  border-bottom: 1px dashed var(--ng-line-strong);
}

.page-about .about-milestone__num {
  display: block;
  font-family: var(--ng-mono-font);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--ng-orange);
}

.page-about .about-milestone__stage {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--ng-display-font);
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: 0.05em;
  color: var(--ng-moss);
}

.page-about .about-milestone__body p {
  margin: 0;
  max-width: 64ch;
  line-height: 1.9;
}

@media (min-width: 860px) {
  .page-about .about-milestone {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-milestone__mark {
    position: sticky;
    top: clamp(84px, 14vh, 128px);
    align-self: start;
  }
}

/* ---------- 团队与角色 ---------- */
.page-about .about-role-list {
  list-style: none;
  margin: 1.5rem 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-role-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.3rem 0.95rem;
  align-items: baseline;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--ng-line);
}

.page-about .about-role-list__num {
  font-family: var(--ng-mono-font);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ng-orange);
}

.page-about .about-role-list__name {
  font-family: var(--ng-display-font);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.page-about .about-role-list__desc {
  grid-column: 2 / -1;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ng-gray);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--ng-line);
  background-color: var(--ng-paper);
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--ng-gray);
}

/* ---------- 资质 ---------- */
.page-about .about-certs {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
}

.page-about .about-cert {
  background-color: var(--ng-paper);
  border: 1px solid var(--ng-line);
  border-left: 4px solid var(--ng-moss);
  padding: 0.9rem 1.05rem;
  transition: border-color 0.25s var(--ng-ease), transform 0.25s var(--ng-ease);
}

.page-about .about-cert:hover,
.page-about .about-cert[open] {
  border-left-color: var(--ng-orange);
}

.page-about .about-cert summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.85rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--ng-display-font);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

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

.page-about .about-cert summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ng-mono-font);
  font-size: 1.1rem;
  color: var(--ng-orange);
}

.page-about .about-cert[open] summary::after {
  content: "−";
}

.page-about .about-cert__role {
  font-family: var(--ng-mono-font);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ng-copper);
}

.page-about .about-cert p {
  margin: 0.7rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ---------- 服务网络节点 ---------- */
.page-about .about-nodes {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.75rem;
}

.page-about .about-node {
  position: relative;
  padding: 1rem 1.1rem 1rem 2rem;
  background-color: var(--ng-paper);
  border: 1px solid var(--ng-line);
  transition: border-color 0.25s var(--ng-ease), transform 0.25s var(--ng-ease), box-shadow 0.25s var(--ng-ease);
}

.page-about .about-node__dot {
  position: absolute;
  left: 0.85rem;
  top: 1.3rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background-color: var(--ng-cyan);
  box-shadow: 0 0 0 4px rgba(25, 185, 190, 0.18);
}

.page-about .about-node__name {
  display: block;
  font-family: var(--ng-display-font);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.page-about .about-node__tip {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ng-gray);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within,
.page-about .about-node:focus-visible {
  border-color: var(--ng-orange);
  transform: translateY(-2px);
  box-shadow: var(--ng-shadow);
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .about-node__tip {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--ng-ease), opacity 0.32s var(--ng-ease), margin-top 0.32s var(--ng-ease);
  }
  .page-about .about-node:hover .about-node__tip,
  .page-about .about-node:focus-within .about-node__tip,
  .page-about .about-node:focus-visible .about-node__tip {
    max-height: 9rem;
    margin-top: 0.4rem;
    opacity: 1;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--ng-line);
  border: 1px solid var(--ng-line);
}

.page-about .about-eco__item {
  background-color: var(--ng-cream);
  padding: clamp(1.1rem, 2.4vw, 1.6rem);
}

.page-about .about-eco__tag {
  display: inline-block;
  margin-bottom: 0.85rem;
  padding: 0.22rem 0.5rem;
  font-family: var(--ng-mono-font);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ng-paper);
  background-color: var(--ng-moss);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
}

@media (min-width: 720px) {
  .page-about .about-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-about .about-eco {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-cta p {
  margin: 0.9rem 0 0;
  max-width: 56ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.85);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (min-width: 900px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }
  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}