.page-about {
  --about-text: #CBD9D2;
  --about-soft: rgba(198, 255, 61, 0.12);
  --about-orange-soft: rgba(255, 138, 42, 0.14);
  background:
    radial-gradient(120% 60% at 88% 0%, rgba(198, 255, 61, 0.10) 0%, rgba(6, 30, 24, 0) 58%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 55%, var(--ink) 100%);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.015em;
  margin: 0;
}

.page-about h1 {
  font-weight: 900;
  font-size: clamp(34px, 9vw, 86px);
  line-height: 1.02;
  margin-top: 10px;
}

.page-about h2 {
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 40px);
  line-height: 1.16;
  margin-bottom: 14px;
}

.page-about h3 {
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  margin-bottom: 6px;
}

.page-about p {
  margin: 0 0 14px;
  color: var(--about-text);
  line-height: 1.8;
}

.page-about .about-lede {
  color: var(--paper);
  font-size: 16px;
  max-width: 34em;
}

/* 面包屑 */
.page-about .page-about-crumbs {
  padding-top: 18px;
  padding-bottom: 4px;
}

.page-about .crumbs {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  color: var(--lime);
}

.page-about .crumbs-sep {
  margin: 0 8px;
  opacity: 0.6;
}

/* 首屏 */
.page-about .about-hero {
  padding: 20px 0 0;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-hero-lead {
  min-width: 0;
}

.page-about .eyebrow {
  color: var(--lime);
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.08em;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-facts {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--ink-3) 0%, var(--ink-2) 100%);
  padding: 18px;
}

.page-about .about-facts-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--lime-soft);
  margin: 0 0 12px;
}

.page-about .about-facts-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-facts-list li {
  display: grid;
  grid-template-columns: 66px 1fr;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--about-text);
  line-height: 1.6;
}

.page-about .about-facts-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-facts-list .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-hero-media {
  margin: 26px 0 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-hero-media img {
  aspect-ratio: 16 / 9;
  filter: saturate(1.05) contrast(1.02);
}

.page-about .media-caption {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--muted);
  padding: 10px 0 0;
  line-height: 1.6;
}

/* 引用块 */
.page-about .about-quote {
  padding: 34px 0 0;
}

.page-about .about-quote blockquote {
  margin: 0;
  padding: 6px 0 6px 18px;
  border-left: 3px solid var(--orange);
}

.page-about .about-quote p {
  font-family: var(--font-serif);
  font-size: clamp(20px, 4.6vw, 28px);
  line-height: 1.5;
  color: var(--paper);
  margin: 0;
}

/* 通用分栏 */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-kicker {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--orange-soft);
  margin: 0 0 10px;
}

.page-about .about-note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

/* 原则手风琴 */
.page-about .about-principles {
  padding-top: 46px;
}

.page-about .about-acc {
  border-top: 1px solid var(--line);
  padding: 0;
}

.page-about .about-acc:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-about .about-acc summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

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

.page-about .about-acc summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--lime);
  flex: none;
  margin-left: auto;
}

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

.page-about .about-acc[open] summary {
  color: var(--lime-soft);
}

.page-about .about-acc-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--orange);
  flex: none;
}

.page-about .about-acc-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--paper);
}

.page-about .about-acc-hint {
  display: none;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.page-about .about-acc-body {
  padding: 0 0 20px;
}

.page-about .about-acc-body p {
  font-size: 15px;
  max-width: 40em;
}

.page-about .about-acc-tail {
  color: var(--lime-soft) !important;
  font-family: var(--font-serif);
  font-size: 14px !important;
  margin-bottom: 0 !important;
}

/* 渐变分隔条 */
.page-about .about-divider {
  height: 1px;
  margin: 46px 0 0;
  background: linear-gradient(90deg, rgba(198, 255, 61, 0) 0%, var(--lime) 22%, var(--orange) 78%, rgba(255, 138, 42, 0) 100%);
  opacity: 0.55;
}

/* 团队 */
.page-about .about-team {
  padding-top: 46px;
}

.page-about .about-team-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-team-media {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-3);
}

.page-about .about-team-media img {
  aspect-ratio: 4 / 3;
}

.page-about .about-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps li {
  position: relative;
  padding: 14px 16px 14px 52px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.page-about .about-steps li p {
  font-size: 14px;
  margin: 0;
}

.page-about .about-step-num {
  position: absolute;
  left: 16px;
  top: 16px;
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-team-tail {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 15px;
}

/* 历程 */
.page-about .about-timeline {
  padding-top: 46px;
}

.page-about .about-timeline-head {
  margin-bottom: 20px;
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 14px;
  scrollbar-width: thin;
}

.page-about .about-rail-year {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--lime-soft);
  text-decoration: none;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--ink-2);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail-year:hover,
.page-about .about-rail-year:focus-visible {
  border-color: var(--lime);
  color: var(--ink);
  background: var(--lime);
}

.page-about .about-rail-year.is-current {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .about-timeline-media {
  margin: 6px 0 22px;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-timeline-media img {
  aspect-ratio: 12 / 5;
}

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-node {
  padding: 16px 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--ink-2);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-node:target,
.page-about .about-node:hover {
  border-left-color: var(--lime);
  background: var(--ink-3);
}

.page-about .about-node--now {
  border-left-color: var(--orange);
  background: linear-gradient(140deg, var(--ink-3) 0%, var(--ink-2) 100%);
}

.page-about .about-node-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--lime);
  margin-bottom: 8px;
}

.page-about .about-node--now .about-node-year {
  color: var(--orange-soft);
}

.page-about .about-node p {
  font-size: 14px;
  margin: 0;
}

/* 服务 */
.page-about .about-service {
  padding-top: 46px;
  padding-bottom: 64px;
}

.page-about .about-service-grid {
  display: grid;
  gap: 24px;
}

.page-about .about-service-list {
  list-style: none;
  margin: 18px 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-service-list li {
  font-size: 14px;
  color: var(--about-text);
  line-height: 1.7;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  background: var(--about-soft);
  border: 1px solid var(--line);
}

.page-about .about-service-list strong {
  color: var(--lime);
  font-weight: 700;
  margin-right: 6px;
}

.page-about .about-service-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-contact-card {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 20px;
  background: linear-gradient(155deg, var(--ink-3) 0%, var(--ink-2) 100%);
}

.page-about .about-contact-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--orange-soft);
  margin: 0 0 14px;
}

.page-about .about-contact-list {
  margin: 0 0 14px;
  display: grid;
  gap: 14px;
}

.page-about .about-contact-list dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 4px;
}

.page-about .about-contact-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact-list dd a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
}

.page-about .about-contact-note {
  font-size: 12.5px;
  color: var(--muted);
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  line-height: 1.7;
}

/* 中等屏 */
@media (min-width: 760px) {
  .page-about .about-hero-actions {
    margin-top: 26px;
  }

  .page-about .about-acc-hint {
    display: block;
    margin-left: 8px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-steps li {
    padding: 46px 16px 16px;
  }

  .page-about .about-step-num {
    top: 16px;
  }

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

  .page-about .about-node--now {
    grid-column: 1 / -1;
  }
}

/* 桌面 */
@media (min-width: 1040px) {
  .page-about .about-hero {
    padding-top: 28px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
    gap: 48px;
  }

  .page-about .about-hero-media {
    margin-top: 34px;
  }

  .page-about .about-split {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-split-aside {
    position: sticky;
    top: calc(var(--header-min) + 56px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-service-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-node--now {
    grid-column: span 2;
  }

  .page-about .about-quote {
    padding-top: 44px;
  }

  .page-about .about-principles,
  .page-about .about-team,
  .page-about .about-timeline,
  .page-about .about-service {
    padding-top: 64px;
  }

  .page-about .about-service {
    padding-bottom: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-year,
  .page-about .about-node,
  .page-about .about-acc summary {
    transition: none;
  }
}