.page-about {
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 28px;
  padding-bottom: 56px;
}

.page-about .about-crumb {
  padding-top: 18px;
  padding-bottom: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-100);
  border-bottom: 2px solid var(--ink-900);
  padding: 28px 0 40px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -70px;
  width: 300px;
  height: 300px;
  background: var(--signal-orange);
  transform: rotate(17deg);
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -130px;
  left: -50px;
  width: 230px;
  height: 230px;
  background: var(--cyan-glow);
  transform: rotate(-11deg);
  opacity: 0.1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  letter-spacing: 0.12em;
  color: var(--signal-orange);
  border-bottom: 2px solid var(--signal-orange);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-size: 32px;
  line-height: 42px;
  font-weight: 900;
  letter-spacing: -0.4px;
  color: var(--paper-000);
}

.page-about .about-hero__lead {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 28px;
  color: var(--paper-100);
  opacity: 0.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding-top: 18px;
  border-top: 2px solid var(--ink-600);
}

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

.page-about .about-fact dt {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 18px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 15px;
  line-height: 24px;
  font-weight: 700;
  color: var(--paper-000);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 2px solid var(--ink-600);
  background: var(--ink-800);
}

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

.page-about .about-hero__figure .media-frame__caption {
  padding: 10px 12px;
  font-size: 13px;
  line-height: 20px;
  background: var(--ink-800);
  color: var(--steel-400);
  border-top: 2px solid var(--ink-600);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 56px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 40px;
    align-items: end;
  }
  .page-about .about-hero h1 {
    font-size: 44px;
    line-height: 56px;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  margin-top: 34px;
}

.page-about .about-layout {
  display: grid;
  gap: 28px;
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }
}

.page-about .about-rail {
  background: var(--paper-000);
  border: 2px solid var(--ink-900);
  box-shadow: 4px 4px 0 var(--ink-900);
  padding: 14px 16px;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 18px;
  letter-spacing: 0.14em;
  color: var(--ink-600);
  border-bottom: 2px solid var(--ink-900);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  color: var(--ink-900);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-rail__link:hover {
  color: var(--signal-orange);
}

.page-about .about-rail__link[data-current="true"] {
  color: var(--signal-orange);
  font-weight: 700;
  border-bottom-color: var(--signal-orange);
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    display: block;
    overflow: visible;
  }
  .page-about .about-rail__link {
    padding: 7px 0 7px 12px;
    white-space: normal;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }
  .page-about .about-rail__link[data-current="true"] {
    border-left-color: var(--signal-orange);
  }
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: 30px 0;
  border-top: 2px solid var(--ink-600);
}

.page-about .about-main > .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.page-about .about-sec__eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  letter-spacing: 0.1em;
  color: var(--ink-600);
  border-bottom: 2px solid var(--ink-900);
}

.page-about .about-sec h2 {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 36px;
  font-weight: 900;
  letter-spacing: -0.2px;
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 28px;
  color: var(--ink-700);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 28px;
  color: var(--ink-700);
}

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

@media (min-width: 768px) {
  .page-about .about-sec {
    padding: 40px 0;
  }
  .page-about .about-sec h2 {
    font-size: 30px;
    line-height: 40px;
  }
}

/* ---------- 定位要点 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-points li {
  padding: 14px 16px;
  background: var(--paper-000);
  border: 2px solid var(--ink-900);
  box-shadow: 4px 4px 0 var(--ink-900);
  font-size: 15px;
  line-height: 26px;
  color: var(--ink-700);
}

.page-about .about-points strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 18px;
  letter-spacing: 0.12em;
  color: var(--signal-orange);
}

@media (min-width: 768px) {
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-figure {
  margin: 22px 0 28px;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 63px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--ink-600);
  transform: translateX(-1px);
}

.page-about .about-stage {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 63px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper-000);
  border: 2px solid var(--ink-900);
  transform: translateX(-50%);
  z-index: 1;
}

.page-about .about-stage__year {
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 22px;
  font-weight: 600;
  color: var(--ink-600);
  text-align: right;
}

.page-about .about-stage__card {
  padding: 16px 18px;
  background: var(--paper-000);
  border: 2px solid var(--ink-900);
  box-shadow: 4px 4px 0 var(--ink-900);
}

.page-about .about-stage__no {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 18px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
}

.page-about .about-stage__card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 28px;
  font-weight: 700;
}

.page-about .about-stage__card p {
  margin: 0;
  font-size: 15px;
  line-height: 26px;
  color: var(--ink-700);
}

.page-about .about-stage--now .about-stage__card {
  box-shadow: 6px 6px 0 var(--signal-orange);
}

.page-about .about-stage--now::before {
  background: var(--signal-orange);
  border-color: var(--ink-900);
}

.page-about .about-stage--now .about-stage__no {
  color: var(--signal-orange);
}

@media (min-width: 768px) {
  .page-about .about-timeline {
    gap: 24px;
  }
  .page-about .about-stage {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 26px;
  }
  .page-about .about-timeline::before {
    left: 91px;
  }
  .page-about .about-stage::before {
    left: 91px;
  }
  .page-about .about-stage__year {
    font-size: 16px;
    line-height: 26px;
    padding-top: 18px;
  }
  .page-about .about-stage__card {
    padding: 20px 22px;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .about-team-figure {
  margin: 20px 0 26px;
}

.page-about .team-chart {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-row {
  min-width: 0;
  padding-top: 12px;
  border-top: 2px solid var(--ink-900);
}

.page-about .team-row__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 8px;
}

.page-about .team-row__name {
  font-size: 17px;
  line-height: 26px;
  font-weight: 700;
}

.page-about .team-row__num {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 22px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .team-row__track {
  height: 14px;
  margin-bottom: 10px;
  background: var(--paper-000);
  border: 2px solid var(--ink-900);
  overflow: hidden;
}

.page-about .team-row__fill {
  display: block;
  height: 100%;
  background: var(--ink-700);
}

.page-about .team-row__fill--orange {
  background: var(--signal-orange);
}

.page-about .team-row__fill--cyan {
  background: var(--cyan-glow);
}

.page-about .team-row__fill--amber {
  background: var(--amber-index);
}

.page-about .team-row__desc {
  margin: 0;
  font-size: 15px;
  line-height: 26px;
  color: var(--ink-700);
}

@media (min-width: 768px) {
  .page-about .team-chart {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 32px;
  }
}

/* ---------- 访问结构 ---------- */
.page-about .reach-meter {
  display: flex;
  gap: 3px;
  height: 64px;
  margin: 22px 0 14px;
  padding: 4px;
  background: var(--paper-000);
  border: 2px solid var(--ink-900);
  box-shadow: 4px 4px 0 var(--ink-900);
}

.page-about .reach-block {
  display: block;
  height: 100%;
}

.page-about .reach-block--hot {
  flex: 11.5 1 0;
  background: var(--signal-orange);
}

.page-about .reach-block--rest {
  flex: 54 1 0;
  background: var(--ink-700);
}

.page-about .reach-legend {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 22px;
  color: var(--ink-700);
}

.page-about .reach-legend li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.page-about .reach-swatch {
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-top: 4px;
  border: 2px solid var(--ink-900);
}

.page-about .reach-swatch--hot {
  background: var(--signal-orange);
}

.page-about .reach-swatch--rest {
  background: var(--ink-700);
}

.page-about .about-reach-copy p:first-child {
  margin-top: 0;
}

/* ---------- 内容标准 ---------- */
.page-about .std-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .std-item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 2px solid var(--ink-600);
}

.page-about .std-item:first-child {
  border-top: 2px solid var(--ink-600);
}

.page-about .std-item__name {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 18px;
  line-height: 28px;
  font-weight: 900;
  color: var(--ink-900);
}

.page-about .std-item__name::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  background: var(--signal-orange);
}

.page-about .std-item:nth-child(2) .std-item__name::before {
  background: var(--cyan-glow);
}

.page-about .std-item:nth-child(3) .std-item__name::before {
  background: var(--amber-index);
}

.page-about .std-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 26px;
  color: var(--ink-700);
}

@media (min-width: 768px) {
  .page-about .std-item {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
  .page-about .std-item__name {
    padding-top: 1px;
  }
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 40px;
  padding: 26px 20px;
  background: var(--ink-800);
  border: 2px solid var(--ink-900);
  box-shadow: 6px 6px 0 var(--ink-900);
  color: var(--paper-100);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 200px;
  height: 200px;
  background: var(--signal-orange);
  transform: rotate(20deg);
  opacity: 0.18;
  pointer-events: none;
}

.page-about .about-cta h2 {
  position: relative;
  z-index: 1;
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 32px;
  font-weight: 900;
  color: var(--paper-000);
}

.page-about .about-cta p {
  position: relative;
  z-index: 1;
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 26px;
  color: var(--paper-100);
  opacity: 0.86;
}

.page-about .about-cta__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
}

.page-about .about-cta__link {
  font-size: 15px;
  line-height: 24px;
  font-weight: 600;
  color: var(--paper-100);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--cyan-glow);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-cta__link:hover {
  color: var(--cyan-glow);
}

@media (min-width: 768px) {
  .page-about .about-cta {
    margin-top: 52px;
    padding: 34px 32px;
  }
  .page-about .about-cta h2 {
    font-size: 26px;
    line-height: 36px;
  }
}