.page-about {
  --about-rail: 250px;
  --about-gap: clamp(22px, 3vw, 46px);
  --about-soft: rgba(251, 250, 247, .72);
}

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

/* ---------- 首屏：档案扉页 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(38px, 6vw, 84px) 0 clamp(52px, 7vw, 96px);
  background:
    linear-gradient(158deg, #062B42 0%, var(--deep) 34%, var(--water) 82%, #0B4470 100%);
  color: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), 0 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -12%;
  width: min(720px, 82vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle, rgba(35, 227, 198, .26), rgba(35, 227, 198, 0) 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(35, 227, 198, .8), rgba(35, 227, 198, 0));
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-hero__text h1 {
  margin: 6px 0 18px;
  font-size: clamp(2.5rem, 8vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-hero__text .lede {
  max-width: 34em;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.82;
  color: rgba(251, 250, 247, .86);
}

.page-about .about-hero__meta {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(191, 239, 232, .82);
}

.page-about .about-hero__plate .plate__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(191, 239, 232, .34);
  background: rgba(8, 52, 79, .5);
}

.page-about .about-hero__plate img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.86) contrast(1.04);
}

.page-about .about-hero__plate .plate__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.68;
  color: rgba(191, 239, 232, .7);
}

/* 三项沿革数字 */
.page-about .about-facts {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(30px, 5vw, 58px) 0 0;
  padding: 1px;
  list-style: none;
  border-radius: var(--radius);
  border: 1px solid rgba(191, 239, 232, .3);
  background: rgba(191, 239, 232, .22);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.page-about .about-facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 8px;
  padding: 18px 20px;
  background: rgba(6, 37, 57, .62);
}

.page-about .about-facts__value {
  font-family: var(--font-mono);
  font-size: clamp(1.85rem, 4.4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-facts__unit {
  font-size: 13.5px;
  letter-spacing: .04em;
  color: rgba(191, 239, 232, .82);
}

.page-about .about-facts__label {
  flex: 1 1 100%;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(251, 250, 247, .66);
}

/* ---------- 叙事带公用骨架 ---------- */
.page-about .section--paper {
  background-image: radial-gradient(rgba(16, 34, 46, .045) 1px, transparent 1px);
  background-size: 15px 15px;
}

.page-about .about-arch {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-rail {
  align-self: start;
  display: grid;
  gap: 16px;
}

.page-about .about-note {
  margin: 0;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-note strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--water);
}

.page-about .about-note--deep {
  color: rgba(191, 239, 232, .78);
  border-left-color: var(--cinnabar);
}

.page-about .about-note--deep strong {
  color: var(--cinnabar);
}

.page-about .about-body > * + * {
  margin-top: clamp(16px, 2.2vw, 24px);
}

.page-about .about-body h2 {
  margin: 6px 0 0;
  font-size: clamp(1.65rem, 3.8vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--ink);
}

.page-about .about-body h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-body p {
  max-width: 42em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ink);
}

.page-about .about-sub {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hint {
  font-size: 13.5px;
  color: var(--muted);
}

/* ---------- 赛季分段条 ---------- */
.page-about .about-segs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-seg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(191, 239, 232, .34), rgba(14, 90, 138, .12));
  transition: border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-seg:nth-child(2) {
  background: linear-gradient(180deg, rgba(191, 239, 232, .26), rgba(14, 90, 138, .18));
}

.page-about .about-seg:nth-child(3) {
  background: linear-gradient(180deg, rgba(14, 90, 138, .2), rgba(8, 52, 79, .24));
}

.page-about .about-seg:nth-child(4) {
  background: linear-gradient(180deg, rgba(8, 52, 79, .3), rgba(8, 52, 79, .42));
}

.page-about .about-seg:nth-child(3) .about-seg__label,
.page-about .about-seg:nth-child(3) .about-seg__range,
.page-about .about-seg:nth-child(4) .about-seg__label,
.page-about .about-seg:nth-child(4) .about-seg__range {
  color: rgba(251, 250, 247, .95);
}

.page-about .about-seg:nth-child(3) .about-seg__meta,
.page-about .about-seg:nth-child(4) .about-seg__meta {
  color: rgba(191, 239, 232, .76);
}

.page-about .about-seg__range {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--water);
}

.page-about .about-seg__label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-seg__meta {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  opacity: .62;
  transition: opacity .2s var(--ease);
}

.page-about .about-seg:hover,
.page-about .about-seg:focus-visible {
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-seg:hover .about-seg__meta,
.page-about .about-seg:focus-visible .about-seg__meta {
  opacity: 1;
}

.page-about .about-seg:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

/* ---------- 图片容器 ---------- */
.page-about .about-plate {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-plate .plate__frame {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--paper);
}

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

.page-about .about-plate .plate__caption {
  margin-top: 11px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 三级流程台阶 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 6px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--paper);
}

.page-about .about-steps__bar {
  display: block;
  width: 6px;
  height: 48px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--water));
}

.page-about .about-steps li:nth-child(2) .about-steps__bar {
  height: 78px;
}

.page-about .about-steps li:nth-child(3) .about-steps__bar {
  height: 110px;
  background: linear-gradient(180deg, var(--water), var(--deep));
}

.page-about .about-steps__idx {
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .about-steps li p {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-steps__meta {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--water);
}

/* ---------- 折叠细则 ---------- */
.page-about .about-fold {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  overflow: hidden;
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 18px;
  cursor: pointer;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--water);
  list-style: none;
}

.page-about .about-fold summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--cyan);
  transition: transform .2s var(--ease);
}

.page-about .about-fold[open] summary::before {
  content: "–";
}

.page-about .about-fold summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .about-fold ul {
  margin: 0;
  padding: 2px 20px 20px 40px;
  display: grid;
  gap: 9px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

/* ---------- 编辑部 ---------- */
.page-about .about-editorial {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-count {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 24px;
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--deep), var(--water));
  color: var(--paper);
}

.page-about .about-count__value {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 9vw, 4.4rem);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-count__label {
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: rgba(251, 250, 247, .8);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-role {
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  border-top: 3px solid var(--water);
  background: var(--sand);
}

.page-about .about-role:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-role:nth-child(3) {
  border-top-color: var(--cinnabar);
}

.page-about .about-role__num {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
  color: var(--water);
}

.page-about .about-role p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-clock {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-clock li {
  position: relative;
  padding-top: 24px;
  border-top: 2px solid var(--line);
}

.page-about .about-clock li::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(35, 227, 198, .2);
}

.page-about .about-clock__time {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--water);
}

.page-about .about-clock p {
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

/* ---------- 服务范围（深色收束带） ---------- */
.page-about .section--deep .about-body h2 {
  color: var(--paper);
}

.page-about .section--deep .about-body p {
  color: rgba(251, 250, 247, .84);
}

.page-about .eyebrow--deep {
  color: var(--mist);
}

.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-next__card {
  display: block;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(191, 239, 232, .32);
  background: rgba(4, 28, 44, .5);
  text-decoration: none;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-next__card:hover {
  border-color: var(--cyan);
  background: rgba(4, 28, 44, .72);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-next__eyebrow {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-next__title {
  display: block;
  font-size: 15px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--paper);
}

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

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

@media (min-width: 780px) {
  .page-about .about-segs {
    flex-direction: row;
    align-items: stretch;
    min-height: 178px;
    gap: 6px;
  }

  .page-about .about-seg {
    flex: 1 1 0;
    justify-content: flex-end;
    min-width: 0;
  }

  .page-about .about-seg:nth-child(1) { flex-grow: 6; }
  .page-about .about-seg:nth-child(2) { flex-grow: 6; }
  .page-about .about-seg:nth-child(3) { flex-grow: 5; }
  .page-about .about-seg:nth-child(4) { flex-grow: 4; }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-clock {
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
  }

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

@media (min-width: 960px) {
  .page-about .about-arch {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
  }

  .page-about .about-editorial {
    grid-template-columns: 235px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-seg,
  .page-about .about-seg__meta,
  .page-about .about-next__card,
  .page-about .about-fold summary::before {
    transition: none;
  }
}