.page-about {
  --about-grid-unit: 28px;
  --about-topline: linear-gradient(90deg, var(--clr-gold) 0%, var(--clr-red) 100%);
  background: var(--clr-deep);
  color: var(--clr-warm);
  overflow: clip;
}

/* 面包屑 */
.page-about__crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: calc(var(--header-h) + 1.5rem);
  font-size: 0.85rem;
  color: rgba(245, 247, 250, 0.55);
  letter-spacing: 0.04em;
}
.page-about__crumbs-link {
  color: rgba(245, 247, 250, 0.7);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about__crumbs-link:hover {
  color: var(--clr-cyan);
}
.page-about__crumbs-sep {
  color: var(--clr-gold);
}
.page-about__crumbs-current {
  color: var(--clr-gold);
  font-weight: 700;
}

/* 英雄区 */
.page-about__hero {
  position: relative;
  padding: 2.5rem 0 3.5rem;
  background-image:
    linear-gradient(rgba(74, 92, 107, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 92, 107, 0.18) 1px, transparent 1px);
  background-size: var(--about-grid-unit) var(--about-grid-unit);
}
.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--about-topline);
}
.page-about__hero::after {
  content: "";
  position: absolute;
  top: 4px;
  right: 0;
  width: 1px;
  height: 220px;
  background: linear-gradient(180deg, var(--clr-gold) 0%, transparent 100%);
  opacity: 0.45;
}
.page-about__hero-inner {
  display: grid;
  gap: 2.5rem;
}
.page-about__hero-eyebrow {
  color: var(--clr-gold);
}
.page-about__title {
  margin: 0.75rem 0 1.25rem;
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 13ch;
}
.page-about__lead {
  max-width: 60ch;
  font-size: 1.05rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.82);
}
.page-about__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.page-about__hero-tags .tag {
  font-size: 0.78rem;
}
.page-about__hero-metrics {
  display: grid;
  gap: 1rem;
  align-content: start;
}
.page-about__metric {
  background: linear-gradient(150deg, rgba(44, 62, 80, 0.72), rgba(11, 31, 58, 0.88));
  border-color: var(--clr-line);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
  padding: 1.25rem 1.5rem 1.4rem;
  position: relative;
}
.page-about__metric::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--clr-gold);
}
.page-about__metric--cyan::before {
  background: var(--clr-cyan);
}
.page-about__metric--red::before {
  background: var(--clr-red);
}
.page-about__metric-num {
  display: block;
  margin: 0.35rem 0 0.2rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2.5rem;
  line-height: 1;
}
.page-about__metric-num--gold {
  color: var(--clr-gold);
}
.page-about__metric-num--cyan {
  color: var(--clr-cyan);
}
.page-about__metric-num--red {
  color: var(--clr-red);
}
.page-about__metric-sub {
  font-size: 0.85rem;
  color: rgba(245, 247, 250, 0.55);
}

/* 品牌故事 */
.page-about__story-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
.page-about__story-copy p {
  line-height: 1.8;
  margin-bottom: 1rem;
  font-size: 0.98rem;
  color: rgba(245, 247, 250, 0.78);
}
.page-about__story-copy h2 {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.2;
  margin: 0.4rem 0 1.2rem;
}
.page-about__story-media {
  margin: 0;
}
.page-about__frame {
  position: relative;
  background: rgba(44, 62, 80, 0.35);
  border: 1px solid var(--clr-line);
  padding: 0.5rem;
}
.page-about__frame::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 48px;
  height: 48px;
  border-top: 3px solid var(--clr-gold);
  border-right: 3px solid var(--clr-gold);
}
.page-about__frame--cyan::before {
  border-top-color: var(--clr-cyan);
  border-right-color: var(--clr-cyan);
}
.page-about__frame--red::before {
  border-top-color: var(--clr-red);
  border-right-color: var(--clr-red);
}
.page-about__story-img,
.page-about__team-media img,
.page-about__honor-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about__story-media figcaption,
.page-about__team-media figcaption,
.page-about__honor-media figcaption {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  color: rgba(245, 247, 250, 0.5);
  letter-spacing: 0.02em;
}

/* 发展历程 + 能力快照 */
.page-about__journey-grid {
  display: grid;
  gap: 2.5rem;
}
.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--clr-gold) 0%, var(--clr-cyan) 70%, var(--clr-line) 100%);
}
.page-about__timeline-item {
  position: relative;
  padding: 0 0 2.5rem 3.5rem;
}
.page-about__timeline-item:last-child {
  padding-bottom: 0;
}
.page-about__timeline-marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-deep);
  border: 1px solid var(--clr-line);
  border-radius: 50%;
}
.page-about__timeline-marker svg {
  width: 12px;
  height: 12px;
}
.page-about__timeline-marker--current {
  border-color: var(--clr-red);
  box-shadow: 0 0 0 5px rgba(228, 54, 54, 0.15);
}
.page-about__timeline-year {
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-gold);
  letter-spacing: 0.08em;
  border-bottom: 2px solid var(--clr-gold);
  padding-bottom: 0.2rem;
  margin-bottom: 0.6rem;
}
.page-about__timeline-card h3 {
  font-size: 1.2rem;
  font-weight: 900;
  margin: 0 0 0.4rem;
}
.page-about__timeline-card p {
  margin: 0;
  color: rgba(245, 247, 250, 0.72);
  line-height: 1.7;
  font-size: 0.92rem;
}
.page-about__capability {
  background: linear-gradient(160deg, rgba(44, 62, 80, 0.4), rgba(11, 31, 58, 0.7));
  border: 1px solid var(--clr-line);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
.page-about__capability::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(138, 43, 226, 0.18), transparent 70%);
  pointer-events: none;
}
.page-about__capability-head h3 {
  font-size: 1.4rem;
  font-weight: 900;
  margin: 0.4rem 0 0.4rem;
}
.page-about__capability-desc {
  font-size: 0.88rem;
  color: rgba(245, 247, 250, 0.6);
  line-height: 1.6;
}
.page-about__trend {
  width: 100%;
  height: auto;
  display: block;
  margin: 1rem 0;
}
.page-about__trend text {
  font-family: var(--font-mono);
}
.page-about__capability-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about__capability-item {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  padding: 0.7rem 0;
  border-top: 1px solid rgba(74, 92, 107, 0.45);
}
.page-about__capability-item .tag {
  flex: 0 0 auto;
  margin-top: 0.1rem;
  font-size: 0.72rem;
}
.page-about__capability-item strong {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 0.15rem;
}
.page-about__capability-item p {
  margin: 0;
  font-size: 0.82rem;
  color: rgba(245, 247, 250, 0.58);
  line-height: 1.5;
}

/* 数据里程碑 */
.page-about__milestone-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}
.page-about__milestone-card {
  background: linear-gradient(160deg, rgba(44, 62, 80, 0.55), rgba(11, 31, 58, 0.75));
  border: 1px solid var(--clr-line);
  border-top: 3px solid var(--clr-gold);
  padding: 1.25rem 1.25rem 1.4rem;
  position: relative;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about__milestone-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 175, 55, 0.6);
}
.page-about__milestone-card:nth-child(4n+1) {
  border-top-color: var(--clr-gold);
}
.page-about__milestone-card:nth-child(4n+2) {
  border-top-color: var(--clr-cyan);
}
.page-about__milestone-card:nth-child(4n+3) {
  border-top-color: var(--clr-purple);
}
.page-about__milestone-card:nth-child(4n+4) {
  border-top-color: var(--clr-red);
}
.page-about__milestone-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(245, 247, 250, 0.4);
  letter-spacing: 0.1em;
}
.page-about__milestone-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1.1;
  margin: 0.45rem 0 0.2rem;
}
.page-about__milestone-card:nth-child(4n+1) .page-about__milestone-num {
  color: var(--clr-gold);
}
.page-about__milestone-card:nth-child(4n+2) .page-about__milestone-num {
  color: var(--clr-cyan);
}
.page-about__milestone-card:nth-child(4n+3) .page-about__milestone-num {
  color: var(--clr-purple-light);
}
.page-about__milestone-card:nth-child(4n+4) .page-about__milestone-num {
  color: var(--clr-red);
}
.page-about__milestone-card h3 {
  font-size: 0.92rem;
  font-weight: 700;
  margin: 0 0 0.3rem;
}
.page-about__milestone-card p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.55;
  color: rgba(245, 247, 250, 0.58);
}

/* 服务体系 */
.page-about__service-grid {
  display: grid;
  gap: 1.2rem;
  margin-top: 1.5rem;
}
.page-about__service-card {
  background: rgba(44, 62, 80, 0.4);
  border: 1px solid var(--clr-line);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about__service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 175, 55, 0.6);
}
.page-about__service-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.page-about__service-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--clr-gold);
  letter-spacing: 0.08em;
}
.page-about__service-card h3 {
  font-size: 1.15rem;
  font-weight: 900;
  margin: 0;
}
.page-about__service-card > p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: rgba(245, 247, 250, 0.72);
}
.page-about__service-more {
  border-top: 1px solid rgba(74, 92, 107, 0.5);
  padding-top: 0.55rem;
  margin-top: auto;
}
.page-about__service-more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--clr-cyan);
}
.page-about__service-more summary::-webkit-details-marker {
  display: none;
}
.page-about__service-more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--clr-gold);
  transition: transform var(--dur) var(--ease);
}
.page-about__service-more[open] summary::after {
  content: "−";
}
.page-about__service-more p {
  margin: 0.55rem 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(245, 247, 250, 0.6);
}

/* 团队与组织 */
.page-about__team-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
.page-about__team-lead {
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.78);
}
.page-about__team-roles {
  list-style: none;
  margin: 1.2rem 0 0;
  padding: 0;
}
.page-about__team-roles li {
  display: flex;
  gap: 0.9rem;
  padding: 0.85rem 0;
  border-top: 1px solid rgba(74, 92, 107, 0.45);
  align-items: flex-start;
}
.page-about__team-role-tag {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 0.6rem;
  border: 1px solid var(--clr-gold);
  color: var(--clr-gold);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.page-about__team-roles strong {
  font-size: 0.92rem;
}
.page-about__team-roles p {
  margin: 0.15rem 0 0;
  font-size: 0.82rem;
  line-height: 1.5;
  color: rgba(245, 247, 250, 0.58);
}
.page-about__team-note {
  margin-top: 1.2rem;
  padding: 0.9rem 1rem;
  background: rgba(212, 175, 55, 0.08);
  border-left: 3px solid var(--clr-gold);
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(245, 247, 250, 0.72);
}
.page-about__team-media {
  margin: 0;
}

/* 荣誉与认可 */
.page-about__honor-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}
.page-about__honor-media {
  margin: 0;
}
.page-about__honor-items {
  display: grid;
  gap: 1rem;
}
.page-about__honor-item {
  background: rgba(44, 62, 80, 0.35);
  border: 1px solid var(--clr-line);
  padding: 1.3rem 1.4rem;
  position: relative;
}
.page-about__honor-item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 34px;
  height: 34px;
  border-left: 3px solid var(--clr-gold);
  border-top: 3px solid var(--clr-gold);
}
.page-about__honor-item:nth-child(2)::before {
  border-left-color: var(--clr-cyan);
  border-top-color: var(--clr-cyan);
}
.page-about__honor-item:nth-child(3)::before {
  border-left-color: var(--clr-red);
  border-top-color: var(--clr-red);
}
.page-about__honor-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}
.page-about__honor-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--clr-gold);
  background: rgba(212, 175, 55, 0.1);
  padding: 0.2rem 0.5rem;
  border: 1px solid rgba(212, 175, 55, 0.5);
}
.page-about__honor-item:nth-child(2) .page-about__honor-badge {
  color: var(--clr-cyan);
  border-color: rgba(0, 229, 255, 0.45);
  background: rgba(0, 229, 255, 0.08);
}
.page-about__honor-item:nth-child(3) .page-about__honor-badge {
  color: var(--clr-red);
  border-color: rgba(228, 54, 54, 0.45);
  background: rgba(228, 54, 54, 0.08);
}
.page-about__honor-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: rgba(245, 247, 250, 0.72);
}
.page-about__honor-item h3 {
  font-size: 1.1rem;
  font-weight: 900;
  margin: 0 0 0.35rem;
}
.page-about__honor-item p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.65;
  color: rgba(245, 247, 250, 0.62);
}

/* 继续查阅 */
.page-about__browse-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}
.page-about__browse-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  background: rgba(44, 62, 80, 0.4);
  border: 1px solid var(--clr-line);
  padding: 1.4rem;
  text-decoration: none;
  color: var(--clr-warm);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about__browse-card:hover {
  border-color: var(--clr-gold);
  transform: translateY(-4px);
}
.page-about__browse-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--clr-cyan);
}
.page-about__browse-card h3 {
  font-size: 1.1rem;
  font-weight: 900;
  margin: 0;
  color: var(--clr-gold);
}
.page-about__browse-card p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(245, 247, 250, 0.65);
}
.page-about__browse-more {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--clr-cyan);
  margin-top: 0.4rem;
}

/* 响应式布局 */
@media (min-width: 640px) {
  .page-about__milestone-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about__service-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__browse-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about__hero-inner {
    grid-template-columns: 1.6fr 1fr;
    gap: 3rem;
  }
  .page-about__hero-metrics {
    padding-top: 2rem;
  }
  .page-about__story-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
  }
  .page-about__journey-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 3rem;
    align-items: start;
  }
  .page-about__service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__team-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
  }
  .page-about__honor-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 3rem;
  }
}