.page-about {
  --about-rail: 216px;
  --about-gap: clamp(26px, 4vw, 54px);
  display: block;
  padding-bottom: clamp(40px, 6vw, 84px);
}

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

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--gray-300);
}

.page-about .breadcrumb__list a {
  color: var(--cyan-300);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--cyan-500);
}

.page-about .breadcrumb__sep {
  color: rgba(195, 206, 217, 0.42);
}

/* 首屏拼贴 */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(16px, 2.4vw, 28px);
  padding: clamp(28px, 4.4vw, 56px) 0 clamp(32px, 5vw, 68px);
  background:
    radial-gradient(115% 88% at 84% 4%, rgba(24, 199, 216, 0.16), transparent 58%),
    radial-gradient(78% 68% at 4% 94%, rgba(231, 168, 62, 0.11), transparent 62%);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
  align-items: center;
}

.page-about .about-hero__intro {
  min-width: 0;
}

.page-about .about-hero__intro .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-500);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(28px, 4.6vw, 46px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero h1 em {
  font-style: normal;
  background: linear-gradient(96deg, var(--cyan-300), var(--gold-300) 88%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lead {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(233, 238, 243, 0.82);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--gray-300);
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan-300);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  background: linear-gradient(152deg, var(--deep-500), var(--deep-900) 74%);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
  box-shadow: 0 22px 56px rgba(6, 26, 46, 0.55);
}

.page-about .about-hero__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05);
}

.page-about .about-hero__media .media__label {
  display: block;
  padding: 10px 4px 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gray-300);
}

/* 侧栏 + 内容双栏 */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(8px, 1.6vw, 16px);
}

.page-about .about-side {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 16px;
  background: linear-gradient(180deg, rgba(11, 42, 69, 0.72), rgba(6, 26, 46, 0.5));
}

.page-about .about-side__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gray-300);
}

.page-about .about-side__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-side__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: 4px;
  font-size: 14.5px;
  color: rgba(233, 238, 243, 0.78);
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease), transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-side__list a .mono {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--cyan-500);
}

.page-about .about-side__list a:hover,
.page-about .about-side__list a:focus-visible {
  background: rgba(24, 199, 216, 0.09);
  border-left-color: var(--cyan-500);
  color: var(--ink);
  transform: translateX(3px);
}

.page-about .about-side__note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-side__note .status {
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 4px rgba(62, 213, 152, 0.14);
  animation: about-pulse 3.4s var(--ease) infinite;
}

.page-about .about-side__note p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--gray-300);
}

@keyframes about-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.42; }
}

/* 正文区 */
.page-about .about-main {
  display: grid;
  gap: clamp(30px, 4.4vw, 62px);
  min-width: 0;
}

.page-about .about-block {
  min-width: 0;
  scroll-margin-top: 96px;
  padding-top: clamp(24px, 3.4vw, 38px);
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-block__index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-500);
}

.page-about .about-block h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(22px, 2.7vw, 31px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-block p {
  margin: 0 0 14px;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(233, 238, 243, 0.8);
}

.page-about .about-block__foot {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid var(--gold-500);
  color: rgba(233, 238, 243, 0.86) !important;
}

/* 三项原则 */
.page-about .pillars {
  display: grid;
  gap: 16px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pillar {
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--cyan-500);
}

.page-about .pillar__key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan-300);
}

.page-about .pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(233, 238, 243, 0.74);
}

/* 发展历程 */
.page-about .milestones {
  position: relative;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .milestones::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-500), rgba(231, 168, 62, 0.7) 56%, rgba(24, 199, 216, 0.14));
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--deep-900);
  border: 2px solid var(--cyan-500);
  box-shadow: 0 0 0 4px rgba(24, 199, 216, 0.12);
}

.page-about .milestone__meta {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--gold-500);
}

.page-about .milestone h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .milestone p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(233, 238, 243, 0.76);
}

.page-about .about-figure {
  margin: 24px 0 0;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(160deg, rgba(18, 59, 92, 0.5), rgba(6, 26, 46, 0.34));
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
}

.page-about .about-figure .media__label {
  display: block;
  padding: 10px 4px 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gray-300);
}

/* 覆盖与兼容 */
.page-about .coverage-grid {
  display: grid;
  gap: 20px;
  margin: 22px 0 4px;
  align-items: center;
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .stat {
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(165deg, rgba(18, 59, 92, 0.5), rgba(6, 26, 46, 0.36));
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-300);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-300);
}

.page-about .coverage-grid .about-figure {
  margin: 0;
}

/* 团队构成 */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
}

.page-about .team-card {
  --accent: var(--cyan-500);
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(168deg, rgba(18, 59, 92, 0.6), rgba(6, 26, 46, 0.46));
  clip-path: polygon(0 0, 100% 0, 100% 100%, calc(var(--cut) * 0.8) 100%, 0 calc(100% - var(--cut) * 0.8));
}

.page-about .team-card::before {
  content: "";
  display: block;
  width: 30px;
  height: 3px;
  margin-bottom: 14px;
  border-radius: 2px;
  background: var(--accent);
}

.page-about .team-card--cyan { --accent: var(--cyan-500); }
.page-about .team-card--gold { --accent: var(--gold-500); }
.page-about .team-card--ok { --accent: var(--ok); }
.page-about .team-card--dim { --accent: var(--gray-300); }

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card__tag {
  margin: 0 0 10px !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: 0.05em;
  color: var(--accent) !important;
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(233, 238, 243, 0.74);
}

.page-about .team-note {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(11, 42, 69, 0.42);
  overflow: hidden;
}

.page-about .team-note summary {
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan-300);
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-note summary::after {
  content: "+";
  float: right;
  font-family: var(--font-mono);
  color: var(--cyan-500);
}

.page-about .team-note[open] summary::after {
  content: "–";
}

.page-about .team-note summary:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: -2px;
}

.page-about .team-note p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(233, 238, 243, 0.76);
}

/* 运营基础（浅色区） */
.page-about .about-block--light {
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid rgba(6, 26, 46, 0.1);
  border-radius: 18px;
  background: linear-gradient(158deg, var(--gray-100), #ffffff 78%);
  color: var(--deep-900);
}

.page-about .about-block--light .about-block__index {
  color: #0d7f8c;
}

.page-about .about-block--light h2 {
  color: var(--deep-900);
}

.page-about .about-block--light p {
  color: rgba(6, 26, 46, 0.74);
}

.page-about .cred-grid {
  display: grid;
  gap: 16px;
  margin-top: 20px;
  grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
}

.page-about .cred {
  padding-left: 12px;
  border-left: 2px solid rgba(6, 26, 46, 0.16);
}

.page-about .cred__label {
  margin: 0 0 6px !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: 0.05em;
  color: rgba(6, 26, 46, 0.56) !important;
}

.page-about .cred__value {
  margin: 0 !important;
  font-family: var(--font-head);
  font-size: 15.5px !important;
  font-weight: 700;
  line-height: 1.5;
  color: var(--deep-900) !important;
}

/* 协作流程 */
.page-about .flow {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(170deg, rgba(18, 59, 92, 0.44), rgba(6, 26, 46, 0.34));
}

.page-about .flow__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
}

.page-about .flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(233, 238, 243, 0.72);
}

/* 末尾入口 */
.page-about .about-cta {
  margin-top: clamp(42px, 6vw, 78px);
  padding: clamp(30px, 4vw, 54px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(231, 168, 62, 0.1), rgba(24, 199, 216, 0.09) 62%, transparent),
    var(--deep-700);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.76;
  color: rgba(233, 238, 243, 0.78);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 桌面布局 */
@media (min-width: 720px) {
  .page-about .pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -8px;
    width: 12px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan-500), transparent);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.04fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: 26px;
  }

  .page-about .milestone:nth-child(even) {
    margin-left: clamp(0px, 2.6vw, 34px);
  }
}

@media (min-width: 1080px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-side__note .status {
    animation: none;
  }

  .page-about .about-side__list a {
    transition: none;
  }
}
</main>