.page-about {
  --ab-rail: 208px;
  --ab-body: rgba(242, 246, 255, 0.82);
  --ab-anchor: calc(var(--hdr-h) + 28px);
}

/* ---------- 面包屑 ---------- */
.page-about .page-about__crumbs {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 4vw, 56px) 0 clamp(40px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -12%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle at center, rgba(31, 182, 255, 0.16), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  align-items: center;
}

.page-about .about-hero h1 {
  margin: 16px 0 20px;
  font-size: clamp(1.95rem, 1.3rem + 3.2vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 17em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, 0.94rem + 0.28vw, 1.12rem);
  line-height: 1.8;
  color: var(--ab-body);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .hero-stats__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.25rem, 0.98rem + 1.1vw, 1.75rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .hero-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__actions .btn {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
}

.page-about .about-hero__visual {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
}

.page-about .hero-graph {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .hero-graph__tip {
  filter: drop-shadow(0 0 8px rgba(255, 90, 31, 0.85));
}

.page-about .about-hero__scale {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 档案骨架 ---------- */
.page-about .archive {
  display: grid;
  gap: 36px;
  padding: clamp(40px, 5vw, 72px) 0 clamp(56px, 7vw, 104px);
}

.page-about .archive__rail {
  align-self: start;
}

.page-about .archive__rail-title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .year-index {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .year-index::-webkit-scrollbar {
  display: none;
}

.page-about .year-index > li {
  flex: 0 0 auto;
}

.page-about .year-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px 10px 12px;
  border-left: 2px solid var(--line);
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease),
    background var(--fast) var(--ease);
}

.page-about .year-index__no {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  transition: color var(--fast) var(--ease);
}

.page-about .year-index a:hover,
.page-about .year-index a:focus-visible {
  color: var(--white);
  border-left-color: var(--orange);
  background: var(--glass);
}

.page-about .year-index a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .archive__body {
  display: grid;
  gap: clamp(48px, 6vw, 84px);
  min-width: 0;
}

/* ---------- 档案区块 ---------- */
.page-about .doc {
  scroll-margin-top: var(--ab-anchor);
  min-width: 0;
}

.page-about .doc__title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0 0 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: clamp(1.35rem, 1.05rem + 1.35vw, 1.95rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .doc__idx {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .doc__lede {
  margin: 0 0 30px;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ab-body);
}

.page-about .doc__after {
  margin: 28px 0 0;
  max-width: 42em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .doc__after a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 182, 255, 0.4);
  transition: border-color var(--fast) var(--ease), color var(--fast) var(--ease);
}

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

.page-about .sub-title {
  margin: 36px 0 8px;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

/* ---------- 阶段 ---------- */
.page-about .phase {
  position: relative;
  margin-left: 2px;
  padding: 4px 0 30px 22px;
  border-left: 1px solid var(--line);
}

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

.page-about .phase::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 8px;
  width: 3px;
  height: 26px;
  background: var(--orange);
}

.page-about .phase__year {
  display: block;
  margin-bottom: 8px;
  font-size: 0.94rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .phase h3 {
  margin: 0 0 12px;
  font-size: 1.1rem;
  line-height: 1.45;
}

.page-about .phase p {
  margin: 0 0 12px;
  max-width: 42em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ab-body);
}

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

/* ---------- 图片与图注 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure .media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .figure__caption {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: 46em;
}

.page-about .team-figure {
  margin-bottom: 32px;
}

.page-about .team-figure .media {
  aspect-ratio: 5 / 2;
}

/* ---------- 团队分工 ---------- */
.page-about .team-scale {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-scale__item {
  --share: 50%;
  padding: 16px 14px;
  border-left: 2px solid var(--line);
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .team-scale__item--edit {
  --share: 50%;
}

.page-about .team-scale__item--test {
  --share: 29%;
}

.page-about .team-scale__item--log {
  --share: 21%;
}

.page-about .team-scale__item:hover,
.page-about .team-scale__item:focus-within {
  background: var(--glass);
  border-left-color: var(--orange);
}

.page-about .team-scale__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}

.page-about .team-scale__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-scale__num {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .team-scale__bar {
  display: block;
  width: var(--share);
  min-width: 12%;
  height: 6px;
  border-radius: 999px;
  background: var(--cyan);
  opacity: 0.85;
  transition: opacity var(--fast) var(--ease);
}

.page-about .team-scale__item:hover .team-scale__bar {
  opacity: 1;
}

.page-about .team-scale__desc {
  margin: 12px 0 0;
  max-width: 44em;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ab-body);
}

/* ---------- 入表流程 ---------- */
.page-about .flow {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow > li {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .flow__idx {
  padding-top: 3px;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .flow h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
  font-weight: 700;
}

.page-about .flow p {
  margin: 0;
  max-width: 46em;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--ab-body);
}

/* ---------- 联赛频道 ---------- */
.page-about .league-grid {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .league {
  padding: 22px 18px 24px;
  border-top: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: background var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .league:hover {
  background: var(--glass);
  border-left-color: var(--cyan);
}

.page-about .league__no {
  display: block;
  margin-bottom: 12px;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .league__name {
  margin: 0 0 10px;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .league p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ab-body);
}

.page-about .league-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .league-stats__item dt {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .league-stats__item dd {
  margin: 8px 0 0;
  font-size: 1.05rem;
  color: var(--white);
  letter-spacing: -0.01em;
}

/* ---------- 设备端对齐 ---------- */
.page-about .device-panel {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .device-stat {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: 0 0 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .device-stat__num {
  font-family: var(--mono);
  font-size: clamp(2.6rem, 1.9rem + 3.4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--white);
}

.page-about .device-stat__unit {
  font-size: 0.94rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .device-copy p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ab-body);
}

.page-about .inline-cta {
  display: inline-block;
  margin-top: 4px;
  padding-bottom: 3px;
  color: var(--orange);
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 1px solid rgba(255, 90, 31, 0.45);
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .inline-cta:hover,
.page-about .inline-cta:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .device-figure .media {
  aspect-ratio: 4 / 3;
}

/* ---------- 年表 ---------- */
.page-about .mile {
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
}

.page-about .mile__row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
  transition: background var(--fast) var(--ease);
}

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

.page-about .mile__row:hover {
  background: linear-gradient(90deg, var(--glass), transparent 70%);
}

.page-about .mile__year {
  font-size: 0.98rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .mile__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--ab-body);
}

.page-about .mile-figure .media {
  aspect-ratio: 4 / 1;
  border: 1px solid var(--line);
}

/* ---------- 延伸入口 ---------- */
.page-about .next-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .next-links > li {
  border-top: 1px solid var(--line);
}

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

.page-about .next-links a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 18px;
  padding: 18px 4px;
  min-height: 48px;
  color: var(--white);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: padding-left var(--fast) var(--ease), color var(--fast) var(--ease);
}

.page-about .next-links a span {
  font-size: 0.86rem;
  font-weight: 400;
  color: var(--mist);
  transition: color var(--fast) var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  padding-left: 14px;
  color: var(--cyan);
}

.page-about .next-links a:hover span,
.page-about .next-links a:focus-visible span {
  color: var(--ab-body);
}

.page-about .next-links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .league-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .mile__row {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .device-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .league-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .league:nth-child(even) {
    padding-top: 46px;
  }
}

@media (min-width: 1000px) {
  .page-about .archive {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .archive__rail {
    position: sticky;
    top: var(--ab-anchor);
  }

  .page-about .year-index {
    display: grid;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .year-index > li {
    flex: none;
  }

  .page-about .year-index a {
    white-space: normal;
    padding: 11px 12px 11px 14px;
  }
}

@media (max-width: 520px) {
  .page-about .mile-figure .media {
    aspect-ratio: 16 / 9;
  }

  .page-about .device-stat__num {
    font-size: 2.4rem;
  }
}
<<<END>>>