.page-about {
  background: var(--ink-0);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 32px) 0 clamp(44px, 6vw, 82px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(880px, 96vw);
  height: min(880px, 96vw);
  background:
    radial-gradient(circle at 36% 36%, rgba(124, 58, 237, 0.48), transparent 62%),
    radial-gradient(circle at 72% 64%, rgba(34, 211, 238, 0.22), transparent 58%);
  transform: rotate(-6deg);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mauve);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: rgba(167, 159, 199, 0.5);
}

.page-about .breadcrumb a {
  color: var(--mauve);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--star);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  align-items: center;
}

.page-about .about-hero-copy .display {
  margin: 10px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero-copy .lede {
  margin: 0 0 clamp(22px, 3vw, 30px);
  max-width: 38em;
  color: rgba(244, 242, 255, 0.84);
  font-size: clamp(1rem, 1.1vw, 1.08rem);
  line-height: 1.85;
}

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

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  gap: 12px 0;
}

.page-about .about-facts > div {
  padding-right: 20px;
  margin-right: 20px;
  border-right: 1px solid var(--line);
}

.page-about .about-facts > div:last-child {
  padding-right: 0;
  margin-right: 0;
  border-right: 0;
}

.page-about .about-facts dt {
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mauve);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-hero-media .media-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  box-shadow: 0 30px 80px -46px rgba(124, 58, 237, 0.9);
}

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

/* ---------- 正文分栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
  padding-bottom: clamp(50px, 8vw, 108px);
}

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

.page-about .rail-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--mauve);
}

.page-about .rail-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail-nav a {
  display: block;
  padding: 7px 13px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mauve);
  text-decoration: none;
  background: rgba(34, 211, 238, 0.06);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .rail-nav a:hover,
.page-about .rail-nav a:focus-visible {
  color: var(--star);
  background: rgba(124, 58, 237, 0.24);
  border-color: var(--cyan);
}

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

.page-about .about-sec {
  scroll-margin-top: 104px;
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(38px, 5vw, 70px);
  padding-top: clamp(26px, 3vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2vw, 24px);
}

.page-about .sec-num {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(1.32rem, 2.4vw, 1.85rem);
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--star);
}

.page-about .about-sec p {
  max-width: 64ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 242, 255, 0.9);
}

.page-about .about-sec p + p {
  margin-top: 14px;
}

.page-about .about-content a:not(.btn) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.45);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-content a:not(.btn):hover,
.page-about .about-content a:not(.btn):focus-visible {
  color: var(--star);
  border-bottom-color: var(--star);
}

/* ---------- 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: 7px;
  top: 12px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 72%, rgba(124, 58, 237, 0));
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .timeline-item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 16px rgba(34, 211, 238, 0.7);
}

.page-about .stage {
  padding: 16px 18px 18px;
  background: linear-gradient(160deg, rgba(25, 22, 48, 0.94), rgba(18, 16, 31, 0.94));
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .timeline-item:hover .stage {
  transform: translateX(4px);
  border-left-color: var(--cyan);
}

.page-about .stage-years {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet-soft);
}

.page-about .stage-title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--star);
}

.page-about .stage p:last-child {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 242, 255, 0.78);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .team-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-1);
}

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

.page-about .team-copy p {
  margin: 0;
}

.page-about .team-copy p + p {
  margin-top: 14px;
}

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

.page-about .role {
  padding: 18px 18px 20px;
  background: var(--ink-1);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  transform: translateY(-4px);
  border-color: rgba(34, 211, 238, 0.55);
}

.page-about .role-num {
  margin: 0;
  font-size: 28px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .role:nth-child(2) .role-num {
  color: var(--mint);
}

.page-about .role:nth-child(3) .role-num {
  color: var(--violet-soft);
}

.page-about .role-name {
  margin: 8px 0 10px;
  font-size: 1rem;
  color: var(--star);
}

.page-about .role p:last-child {
  max-width: none;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 242, 255, 0.76);
}

/* ---------- 流程 ---------- */
.page-about .process-layout {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-bottom: clamp(20px, 3vw, 28px);
}

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

.page-about .flow li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .flow li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .flow-num {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: rgba(34, 211, 238, 0.85);
}

.page-about .flow-title {
  margin: 0 0 6px;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--star);
}

.page-about .flow p {
  max-width: none;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 242, 255, 0.76);
}

.page-about .process-media {
  margin: 0;
  align-self: start;
  border: 1px solid var(--line);
  background: var(--ink-1);
}

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

.page-about .process-note {
  padding-left: 16px;
  border-left: 2px solid var(--violet);
  color: rgba(244, 242, 255, 0.84);
}

/* ---------- 服务范围 ---------- */
.page-about .cover-grid {
  display: grid;
  gap: 14px;
}

.page-about .cover-card {
  padding: 18px 18px 20px;
  background: rgba(25, 22, 48, 0.72);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(124, 58, 237, 0.7);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%);
}

.page-about .cover-card:nth-child(2) {
  border-top-color: rgba(34, 211, 238, 0.7);
}

.page-about .cover-card:nth-child(3) {
  border-top-color: rgba(74, 222, 128, 0.55);
}

.page-about .cover-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mauve);
}

.page-about .cover-value {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--cyan);
}

.page-about .cover-card p:last-child {
  max-width: none;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 242, 255, 0.76);
}

.page-about .about-strip {
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.4vw, 28px);
  background: linear-gradient(120deg, rgba(34, 211, 238, 0.1), rgba(124, 58, 237, 0.14));
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%);
}

.page-about .strip-label {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--violet-soft);
}

.page-about .about-strip .strip-body {
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 242, 255, 0.84);
}

.page-about .about-strip .strip-body + .strip-body {
  margin-top: 8px;
}

.page-about .about-strip .mono {
  color: var(--star);
  word-break: break-all;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 820px) {
  .page-about .process-layout {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(34px, 5vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .rail-nav {
    display: block;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-nav li {
    margin-left: -1px;
  }

  .page-about .rail-nav a {
    padding: 10px 0 10px 16px;
    background: none;
    border: 0;
    border-left: 1px solid transparent;
    border-radius: 0;
    font-size: 14px;
  }

  .page-about .rail-nav a:hover,
  .page-about .rail-nav a:focus-visible {
    background: none;
    color: var(--star);
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .role,
  .page-about .timeline-item::before,
  .page-about .rail-nav a {
    transition: none;
  }

  .page-about .timeline-item:hover .stage,
  .page-about .role:hover,
  .page-about .role:focus-within {
    transform: none;
  }
}