.page-about {
  --about-radius: 20px;
  --about-gap: clamp(18px, 3vw, 30px);
  --about-y: clamp(52px, 7vw, 96px);
  position: relative;
  background: linear-gradient(180deg, #0B2E26 0%, #08211C 42%, #061914 100%);
  color: var(--text);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 0;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: clamp(16px, 3vw, 28px) 0 0;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--gold-2);
}

/* ---------- 通用文本链接 ---------- */
.page-about .text-link {
  color: var(--gold-2);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .text-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 章节头 ---------- */
.page-about .section {
  padding: var(--about-y) 0;
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .section-title {
  flex: 1 1 auto;
  margin: 0;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.015em;
}

.page-about .section-anno {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--char);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(30px, 5vw, 64px) 0 clamp(44px, 6vw, 84px);
}

.page-about .hero-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-2);
}

.page-about .hero-kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-size: clamp(30px, 6vw, 56px);
  font-weight: 900;
  line-height: 1.13;
  letter-spacing: -.018em;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  margin: 0 0 clamp(24px, 4vw, 36px);
  font-size: clamp(16px, 1.8vw, 17.5px);
  line-height: 1.85;
  color: rgba(230, 237, 233, .88);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

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

.page-about .hero-stat .stat-value {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-about .stat-unit {
  margin-left: 3px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .06em;
}

.page-about .hero-stat .stat-label {
  display: block;
  margin: 0 0 8px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .hero-media .media-frame {
  aspect-ratio: 4 / 3;
}

.page-about .hero-media .media-frame img {
  height: 100%;
}

.page-about .hero-media-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 1px solid var(--line);
  padding-left: 12px;
}

/* ---------- 01 业务 ---------- */
.page-about .what-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .what-text p {
  margin: 0 0 1.1em;
  font-size: clamp(16px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(230, 237, 233, .88);
}

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

.page-about .what-facts {
  padding: clamp(20px, 3vw, 28px);
  background: rgba(28, 36, 34, .72);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
}

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

.page-about .fact-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1;
  color: var(--gold-2);
}

.page-about .fact-txt {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 02 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .team-intro {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role {
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--line-soft);
  transition: border-color .2s ease;
}

.page-about .role:first-child {
  border-top-color: var(--line);
}

.page-about .role:hover {
  border-top-color: var(--cyan);
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .role-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .role-name {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .role-count {
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .role-count .stat-value {
  font-size: clamp(20px, 2.6vw, 26px);
}

.page-about .role-count .stat-unit {
  font-size: 12px;
  color: var(--muted);
}

.page-about .role-bar {
  height: 6px;
  margin: 14px 0 16px;
  border-radius: 3px;
  background: var(--panel);
  overflow: hidden;
}

.page-about .role-bar-fill {
  display: block;
  width: var(--bar, 50%);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(47, 243, 208, .28), var(--cyan));
  transition: width .3s ease;
}

.page-about .role-text {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(230, 237, 233, .84);
}

.page-about .role-meta {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gold-2);
}

/* ---------- 03 流程 ---------- */
.page-about .flow-banner img {
  aspect-ratio: 2 / 1;
}

.page-about .flow-steps {
  display: grid;
  gap: var(--about-gap);
  margin: var(--about-gap) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  padding: 22px 20px 24px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .flow-step:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .flow-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .flow-name {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .flow-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow-foot {
  display: grid;
  gap: var(--about-gap);
  margin-top: var(--about-gap);
}

.page-about .flow-note {
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(160deg, rgba(42, 44, 90, .5), rgba(28, 36, 34, .9));
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
}

.page-about .flow-note-title {
  margin: 0 0 14px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  color: var(--gold-2);
}

.page-about .flow-note p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(230, 237, 233, .86);
}

.page-about .flow-note-list {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .flow-note-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .flow-note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .flow-note-tail {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
  color: var(--gold-2);
}

/* ---------- 04 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(201, 164, 76, .12));
}

.page-about .tl-node {
  position: relative;
  padding-bottom: clamp(10px, 2vw, 18px);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 164, 76, .14);
  transition: background .2s ease, box-shadow .2s ease;
}

.page-about .tl-node--now::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 243, 208, .18);
}

.page-about .tl-node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 243, 208, .2);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 30px);
  letter-spacing: .06em;
  color: var(--gold-2);
  line-height: 1;
  margin-bottom: 6px;
}

.page-about .details {
  border-top: 1px solid var(--line-soft);
}

.page-about .details summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  transition: color .2s ease;
}

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

.page-about .details summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--gold);
  transition: transform .2s ease, color .2s ease;
}

.page-about .details[open] summary {
  color: var(--gold-2);
}

.page-about .details[open] summary::after {
  transform: rotate(45deg);
  color: var(--cyan);
}

.page-about .details-body {
  padding: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .details-body p {
  margin: 0;
}

/* ---------- 05 伙伴 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .partner-card {
  padding: clamp(20px, 3vw, 28px);
  background: rgba(28, 36, 34, .7);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .partner-card--alt {
  background: linear-gradient(150deg, rgba(110, 31, 53, .34), rgba(16, 19, 18, .92));
}

.page-about .partner-card:hover {
  border-color: var(--coral);
  transform: translateY(-2px);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .partner-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.45;
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 06 联系 ---------- */
.page-about .reach-grid {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .reach-path {
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold);
  border-radius: 14px;
  transition: border-left-color .2s ease;
}

.page-about .reach-path:hover {
  border-left-color: var(--cyan);
}

.page-about .reach-path h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
}

.page-about .reach-path p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .reach-contact {
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(170deg, rgba(11, 46, 38, .9), rgba(16, 19, 18, .95));
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
}

.page-about .reach-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .reach-mail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .reach-mail a {
  font-family: var(--font-mono);
  font-size: clamp(14px, 2vw, 17px);
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

.page-about .reach-mail a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .copy-chip {
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-2);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color .2s ease, color .2s ease;
}

.page-about .copy-chip:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .reach-note {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(230, 237, 233, .86);
}

.page-about .reach-extra {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .what-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: 4fr 8fr;
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .team-aside {
    position: sticky;
    top: clamp(72px, 10vh, 120px);
  }

  .page-about .flow-foot {
    grid-template-columns: 5fr 7fr;
    align-items: stretch;
  }

  .page-about .flow-art img {
    height: 100%;
  }

  .page-about .reach-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .flow-steps {
    grid-template-columns: 1.15fr .95fr .95fr 1.15fr;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-bar-fill,
  .page-about .flow-step,
  .page-about .partner-card,
  .page-about .details summary::after {
    transition: none;
  }

  .page-about .flow-step:hover,
  .page-about .partner-card:hover {
    transform: none;
  }
}

.page-about {
  --bar: 1rem;
}