.page-about {
  --about-cut: 18px;
  --about-hair: rgba(23, 59, 92, 0.9);
  --about-cyan-soft: rgba(45, 245, 196, 0.14);
  --about-orange-soft: rgba(255, 122, 47, 0.14);
  display: block;
  overflow-x: clip;
  padding-bottom: 8px;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 32px 40px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 26px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(44px, 10vw, 84px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  margin: 8px 0 0;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 42em;
}

.page-about .about-hero__text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 44em;
}

.page-about .about-hero__aside {
  border: 1px solid var(--track);
  border-top: 2px solid var(--cyan);
  background: linear-gradient(165deg, rgba(23, 59, 92, 0.55), rgba(7, 20, 39, 0.92));
  padding: 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero__aside-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--track);
  border: 1px solid var(--track);
}

.page-about .about-stat {
  background: var(--navy);
  padding: 14px 14px 13px;
}

.page-about .about-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat span {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero__aside-note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: 48px;
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--track) 24%, rgba(23, 59, 92, 0) 82%);
  opacity: 0.55;
}

.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 22px;
}

.page-about .about-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--violet);
  padding-top: 7px;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--white);
  max-width: 20em;
}

.page-about .about-copy p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--white);
  margin: 0 0 14px;
}

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

.page-about .about-copy--wide {
  max-width: 46em;
}

.page-about .about-copy--after {
  margin-top: 22px;
}

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

/* ---------- 侧栏面板 ---------- */
.page-about .about-aside {
  border: 1px solid var(--track);
  border-left: 2px solid var(--orange);
  background: linear-gradient(160deg, rgba(23, 59, 92, 0.5), rgba(12, 32, 54, 0.92));
  padding: 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-aside--honor {
  border-left-color: var(--violet);
}

.page-about .about-aside__title {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.03em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-aside--honor .about-aside__title {
  color: var(--violet);
}

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

.page-about .about-aside li {
  display: grid;
  grid-template-columns: minmax(0, 5.4em) minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--white);
}

.page-about .about-aside li b {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .about-aside--honor li b {
  color: var(--yellow);
}

.page-about .about-aside__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--track);
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--track);
  background: var(--navy);
}

.page-about .about-figure .visual-frame__media {
  overflow: hidden;
}

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

.page-about .about-figure .visual-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--track);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 52%, var(--track));
  opacity: 0.75;
}

.page-about .about-timeline > li {
  position: relative;
  padding: 0 0 20px 32px;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 3px var(--about-cyan-soft);
}

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

.page-about .about-timeline > li:last-child::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px var(--about-orange-soft);
}

.page-about .about-node {
  border: 1px solid var(--track);
  border-left: 2px solid rgba(45, 245, 196, 0.42);
  background: linear-gradient(180deg, rgba(12, 32, 54, 0.95), rgba(7, 20, 39, 0.95));
  padding: 16px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-timeline > li:last-child .about-node {
  border-left-color: var(--orange);
}

.page-about .about-node:hover {
  transform: translateX(3px);
  border-left-color: var(--cyan);
}

.page-about .about-node__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .about-timeline > li:last-child .about-node__tag {
  color: var(--orange);
}

.page-about .about-node h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .about-node p:last-child {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 双主线 ---------- */
.page-about .about-tracks {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-track {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 20px;
  background: var(--navy);
  border: 1px solid var(--track);
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--about-cut));
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--cyan);
}

.page-about .about-track--channel::before {
  background: var(--orange);
}

.page-about .about-track__kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-track--channel .about-track__kicker {
  color: var(--orange);
}

.page-about .about-track__title {
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 0;
}

.page-about .about-steps {
  list-style: none;
  counter-reset: about-step;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-steps li {
  position: relative;
  padding-left: 36px;
}

.page-about .about-steps li::before {
  counter-increment: about-step;
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--violet);
  border: 1px solid var(--track);
  border-radius: 2px;
  padding: 1px 4px;
}

.page-about .about-steps strong {
  display: block;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 3px;
}

.page-about .about-track--channel .about-steps strong {
  color: var(--orange);
}

.page-about .about-steps span {
  display: block;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 团队轮值 ---------- */
.page-about .about-shifts {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .about-shift {
  border: 1px solid var(--track);
  border-top: 2px solid var(--violet);
  background: rgba(12, 32, 54, 0.72);
  padding: 18px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .about-shift h3 {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .about-shift p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 节点网络 ---------- */
.page-about .about-nodes {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-netcard {
  border: 1px solid var(--track);
  border-left: 2px solid var(--cyan);
  background: var(--ink);
  padding: 16px 18px;
  transition: background 0.2s var(--ease), border-left-color 0.2s var(--ease);
}

.page-about .about-netcard:hover {
  background: var(--navy);
  border-left-color: var(--orange);
}

.page-about .about-netcard__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--violet);
  margin: 0 0 7px;
}

.page-about .about-netcard h3 {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .about-netcard p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promises {
  display: grid;
  gap: 1px;
  margin-top: 22px;
  background: var(--track);
  border: 1px solid var(--track);
}

.page-about .about-promise {
  background: var(--navy);
  padding: 20px 18px;
}

.page-about .about-promise h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  margin: 0 0 8px;
  line-height: 1.45;
}

.page-about .about-promise p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .about-contact-line {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta__back {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: 44px 56px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-section {
    padding-block: 72px;
  }

  .page-about .about-head {
    gap: 18px;
    margin-bottom: 28px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-tracks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-timeline {
    margin-top: 36px;
  }

  .page-about .about-timeline > li {
    padding-bottom: 24px;
  }

  .page-about .about-node {
    padding: 18px 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.62fr);
    gap: 64px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-shift,
  .page-about .about-netcard {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-shift:hover {
    transform: none;
  }
}