.page-about {
  --about-gap: 20px;
  --about-rail-w: 132px;
}

/* ---------- 侧栏索引 ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1600px) {
  .page-about .about-rail {
    position: fixed;
    top: 116px;
    left: 20px;
    width: var(--about-rail-w);
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    z-index: 4;
  }
  .page-about .about-rail-title {
    color: var(--dim);
    font-size: 11px;
    letter-spacing: .18em;
    padding-bottom: var(--sp-2);
    border-bottom: 1px solid var(--line);
  }
  .page-about .about-rail a {
    color: var(--dim);
    font-size: 13px;
    line-height: 1.5;
    text-decoration: none;
    padding: 3px 0;
    border-left: 2px solid transparent;
    padding-left: 10px;
    transition: color .2s var(--ease), border-color .2s var(--ease);
  }
  .page-about .about-rail a:hover,
  .page-about .about-rail a:focus-visible {
    color: var(--text);
    border-left-color: var(--cyan);
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: var(--sp-5);
  padding-bottom: var(--sp-6);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: var(--sp-5);
}

.page-about .about-hero-title {
  max-width: 17ch;
  margin: var(--sp-3) 0 var(--sp-4);
}

.page-about .about-hero-lede {
  max-width: 62ch;
}

.page-about .about-hero-note {
  margin-top: var(--sp-4);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .1em;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

.page-about .about-hero-note::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  display: block;
}

/* 三栏不等宽数据卡 */
.page-about .about-stats {
  list-style: none;
  margin: var(--sp-6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: 1.35fr 1fr .85fr;
    gap: var(--sp-4);
  }
}

.page-about .about-stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  min-width: 0;
}

.page-about .about-stat:first-child {
  background: linear-gradient(150deg, var(--panel-2), var(--panel) 70%);
  border-color: rgba(0, 240, 208, .28);
}

.page-about .about-stat-num {
  color: var(--text);
  line-height: .9;
}

.page-about .about-stat:first-child .about-stat-num {
  color: var(--cyan);
}

.page-about .about-stat-label {
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.55;
}

.page-about .about-stat-sub {
  color: var(--dim);
  font-size: 13px;
  line-height: 1.65;
}

/* ---------- 主客场分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

@media (min-width: 980px) {
  .page-about .about-split {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-6);
    align-items: start;
  }
}

.page-about .about-split-text .section-title {
  margin: var(--sp-2) 0 var(--sp-4);
}

.page-about .about-split-text p {
  color: var(--dim);
  margin-bottom: var(--sp-4);
}

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

.page-about .about-versus {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
}

@media (min-width: 560px) {
  .page-about .about-versus {
    grid-template-columns: 1fr 1fr;
  }
}

.page-about .about-versus-col {
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-4);
  border: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-versus-col h3 {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 300;
  letter-spacing: .04em;
  margin: var(--sp-3) 0 var(--sp-2);
  line-height: 1;
}

.page-about .about-versus-col p {
  font-size: 14px;
  color: var(--dim);
  line-height: 1.7;
  margin-bottom: var(--sp-4);
}

.page-about .about-versus-col--home {
  background: linear-gradient(170deg, var(--orange-dark), var(--panel) 78%);
  border-color: rgba(255, 122, 26, .3);
}

.page-about .about-versus-col--home h3 {
  color: var(--orange);
}

.page-about .about-versus-col--away {
  background: linear-gradient(170deg, var(--cyan-dark), var(--panel) 78%);
  border-color: rgba(0, 240, 208, .3);
}

.page-about .about-versus-col--away h3 {
  color: var(--cyan);
}

.page-about .about-versus-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.page-about .about-versus-list li {
  font-size: 13px;
  color: var(--text);
  padding-left: 14px;
  position: relative;
  line-height: 1.6;
}

.page-about .about-versus-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.page-about .about-versus-col--home .about-versus-list li::before {
  background: var(--orange);
}

.page-about .about-versus-col--away .about-versus-list li::before {
  background: var(--cyan);
}

/* ---------- 时间线 ---------- */
.page-about .about-head {
  max-width: 62ch;
}

.page-about .about-timeline-visual {
  margin: var(--sp-5) 0 var(--sp-6);
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
  border: 1px solid var(--line);
}

.page-about .about-timeline-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(5, 7, 13, .9), rgba(5, 7, 13, .35) 55%, rgba(5, 7, 13, .92));
  pointer-events: none;
}

.page-about .about-timeline-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .8;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--cyan-deep) 50%, var(--line));
  border-radius: 2px;
}

.page-about .about-milestone {
  position: relative;
  padding-bottom: var(--sp-5);
}

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

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 240, 208, .14);
  z-index: 1;
}

.page-about .about-milestone--current::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 26, .18);
  animation: about-pulse 2s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 5px rgba(255, 122, 26, .18); }
  50% { box-shadow: 0 0 0 11px rgba(255, 122, 26, .04); }
}

.page-about .about-milestone-card {
  padding: var(--sp-4) var(--sp-4);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .about-milestone-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 240, 208, .4);
}

.page-about .about-ver {
  display: inline-block;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .12em;
  margin-bottom: var(--sp-3);
}

.page-about .about-milestone--current .about-ver {
  color: var(--orange);
}

.page-about .about-milestone-card h3 {
  font-size: 19px;
  font-weight: 500;
  line-height: 1.45;
  margin: 0 0 var(--sp-3);
  color: var(--text);
}

.page-about .about-milestone-card p {
  margin: 0;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.75;
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 0;
  }
  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }
  .page-about .about-milestone {
    width: calc(50% - 28px);
    padding-bottom: var(--sp-5);
  }
  .page-about .about-milestone:nth-child(odd) {
    margin-left: 0;
    margin-right: auto;
  }
  .page-about .about-milestone:nth-child(even) {
    margin-left: calc(50% + 28px);
    margin-right: 0;
  }
  .page-about .about-milestone:nth-child(odd)::before {
    left: auto;
    right: -34px;
  }
  .page-about .about-milestone:nth-child(even)::before {
    left: -34px;
    right: auto;
  }
}

/* ---------- 数据工艺 ---------- */
.page-about .about-craft {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

@media (min-width: 960px) {
  .page-about .about-craft {
    grid-template-columns: 1.15fr .85fr;
    gap: var(--sp-6);
    align-items: start;
  }
}

.page-about .about-craft-text .section-title {
  margin: var(--sp-2) 0 var(--sp-4);
}

.page-about .about-craft-text > p {
  color: var(--dim);
  margin-bottom: var(--sp-4);
}

.page-about .about-craft-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-about .about-craft-steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

.page-about .about-step-num {
  display: block;
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .14em;
  margin-bottom: var(--sp-2);
}

.page-about .about-step h3 {
  font-size: 15px;
  font-weight: 500;
  margin: 0 0 var(--sp-2);
  color: var(--text);
}

.page-about .about-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dim);
}

.page-about .about-craft-visual {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team-visual {
  margin: 0 0 var(--sp-5);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
}

@media (min-width: 820px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-4);
  }
}

.page-about .about-team-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-5) var(--sp-4);
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.page-about .about-team-num {
  color: var(--cyan);
  line-height: .9;
}

.page-about .about-team-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
}

.page-about .about-team-card p {
  margin: 0;
  color: var(--dim);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 覆盖能力 ---------- */
.page-about .about-coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
}

@media (min-width: 900px) {
  .page-about .about-coverage-grid {
    grid-template-columns: 1.4fr 1fr;
    gap: var(--sp-4);
    align-items: stretch;
  }
}

.page-about .about-coverage-main {
  padding: var(--sp-5) var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.page-about .about-coverage-label {
  display: block;
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .about-coverage-body {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-project-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.page-about .about-project-list li {
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: .06em;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  padding: 5px 12px;
  background: var(--void);
  white-space: nowrap;
}

.page-about .about-coverage-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
}

.page-about .about-coverage-cell {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: var(--sp-4) var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  min-width: 0;
}

.page-about .about-coverage-num {
  color: var(--orange);
  line-height: .95;
}

.page-about .about-unit {
  font-size: .42em;
  font-weight: 400;
  margin-left: 2px;
  color: var(--dim);
}

.page-about .about-coverage-cell .text-dim {
  font-size: 12px;
  line-height: 1.5;
}

.page-about .about-coverage-note {
  margin: var(--sp-4) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim);
  padding-left: var(--sp-4);
  border-left: 3px solid var(--cyan);
}

/* ---------- 资质与合作 ---------- */
.page-about .about-cred {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

@media (min-width: 960px) {
  .page-about .about-cred {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-6);
    align-items: start;
  }
}

.page-about .about-cred-text .section-title {
  margin: var(--sp-2) 0 var(--sp-4);
}

.page-about .about-cred-text p {
  color: var(--dim);
  margin-bottom: var(--sp-4);
}

.page-about .about-cred-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.page-about .about-cred-list li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r-md);
  padding: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  min-width: 0;
}

.page-about .about-cred-tag {
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .about-cred-list strong {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
}

.page-about .about-cred-list li > span:last-child {
  font-size: 13px;
  color: var(--dim);
  line-height: 1.7;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: var(--sp-7);
}

.page-about .about-next-lede {
  max-width: 56ch;
  margin-top: var(--sp-3);
}

.page-about .about-next-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

@media (min-width: 700px) {
  .page-about .about-next-links {
    grid-template-columns: 1fr 1fr;
  }
}

.page-about .about-next-link {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-5) var(--sp-4);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
  text-decoration: none;
  color: inherit;
  min-width: 0;
  transition: transform .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(0, 240, 208, .45);
  background: var(--panel-2);
}

.page-about .about-next-index {
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .about-next-link strong {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
}

.page-about .about-next-link > span:last-child {
  font-size: 13px;
  color: var(--dim);
  line-height: 1.7;
}

.page-about .about-next-foot {
  margin-top: var(--sp-5);
  font-size: 14px;
  color: var(--dim);
}

.page-about .about-next-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 208, .4);
}

.page-about .about-next-foot a:hover,
.page-about .about-next-foot a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-milestone--current::before {
    animation: none;
  }
  .page-about .about-milestone-card,
  .page-about .about-next-link {
    transition: none;
  }
}
</