.page-about {
  --about-rail: 104px;
  --about-strip: rgba(36, 64, 90, .9);
  --about-deep: rgba(11, 27, 43, .84);
  background: var(--night);
  color: var(--ink);
  overflow-x: clip;
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about [id] {
  scroll-margin-top: 148px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 0 0;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--ink-dim);
}
.page-about .breadcrumbs a {
  color: var(--ink-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--flare);
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--ink-soft);
}
.page-about .crumb-sep {
  color: var(--grid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 10px;
  padding: clamp(32px, 6vw, 68px) 0 clamp(36px, 6vw, 82px);
  isolation: isolate;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  background-color: var(--night-2);
  background-image:
    linear-gradient(116deg, rgba(31, 111, 74, .46) 0%, rgba(31, 111, 74, .12) 36%, rgba(11, 27, 43, 0) 62%),
    repeating-linear-gradient(90deg, rgba(244, 247, 245, .022) 0 5px, rgba(244, 247, 245, 0) 5px 11px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(52%, 500px);
  height: 100%;
  background: linear-gradient(202deg, rgba(255, 106, 19, .18) 0%, rgba(255, 106, 19, 0) 70%);
  clip-path: polygon(32% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
  pointer-events: none;
}
.page-about .about-hero-inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
  display: grid;
  gap: clamp(22px, 4vw, 42px);
}
@media (min-width: 880px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1fr) minmax(170px, 240px);
    align-items: end;
  }
}
.page-about .about-hero-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--grass-2);
  text-transform: none;
}
.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(29px, 6.2vw, 58px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 800;
  max-width: 15em;
  color: var(--chalk);
}
.page-about .about-hero-lead {
  margin: 0 0 28px;
  max-width: 40ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--ink-soft);
}
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .about-stats .stat {
  background: var(--about-deep);
  padding: 14px 12px 16px;
  display: grid;
  gap: 5px;
  align-content: start;
}
.page-about .about-stats .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(21px, 4.2vw, 33px);
  line-height: 1;
  color: var(--chalk);
}
.page-about .about-stats .stat-label {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--ink-dim);
}
.page-about .about-hero-mark {
  display: none;
}
@media (min-width: 880px) {
  .page-about .about-hero-mark {
    display: block;
    text-align: right;
    border-right: 2px solid var(--flare);
    padding-right: 18px;
  }
}
.page-about .about-hero-year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(58px, 8vw, 112px);
  line-height: .84;
  letter-spacing: -.07em;
  color: rgba(244, 247, 245, .07);
  -webkit-text-stroke: 1px rgba(79, 179, 201, .45);
}
.page-about .about-hero-note {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-dim);
}

/* ---------- 主栅格与侧轨 ---------- */
.page-about .about-grid {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(34px, 6vw, 66px) var(--pad) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
}
@media (min-width: 960px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
}
.page-about .rail {
  align-self: start;
  min-width: 0;
}
@media (min-width: 960px) {
  .page-about .rail {
    position: sticky;
    top: 24px;
  }
}
.page-about .rail-station {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--ink-dim);
}
.page-about .rail-list,
.page-about .rail-season-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .rail-list {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .rail-list::-webkit-scrollbar {
  display: none;
}
@media (min-width: 960px) {
  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: 1px solid var(--hair);
  }
}
.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  font-size: 12.5px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--ink-dim);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
@media (min-width: 960px) {
  .page-about .rail-link {
    border-left: 0;
    margin-left: -1px;
    border-left: 2px solid transparent;
  }
}
.page-about .rail-link:hover,
.page-about .rail-link[aria-current="true"] {
  color: var(--chalk);
  border-left-color: var(--flare);
  background: rgba(255, 106, 19, .07);
}
.page-about .rail-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 10.5px;
  color: var(--flare);
  opacity: .8;
}
.page-about .rail-seasons {
  display: none;
}
@media (min-width: 960px) {
  .page-about .rail-seasons {
    display: block;
    margin-top: 26px;
    padding-top: 16px;
    border-top: 1px solid var(--hair);
  }
}
.page-about .rail-season-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.page-about .rail-year {
  display: block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--ink-dim);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .rail-year:hover {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(38px, 6vw, 68px);
  border-top: 1px solid var(--hair);
  min-width: 0;
}
.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .section-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
}
.page-about .section-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--flare);
}
.page-about .section-title {
  margin: 0;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -.01em;
  font-weight: 800;
  color: var(--chalk);
  max-width: 24em;
}
.page-about .about-intro {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-about .prose p {
  margin: 0 0 16px;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .prose a,
.page-about .about-bridge a {
  color: var(--chalk);
  text-decoration: none;
  border-bottom: 1px solid var(--flare);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease);
}
.page-about .prose a:hover,
.page-about .about-bridge a:hover {
  color: var(--flare);
}
.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 起点：图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}
@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}
.page-about .about-figure {
  margin: 0;
}
.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--hair);
  background: var(--night-2);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  filter: saturate(.92) contrast(1.04);
}
.page-about .media-frame--tall img {
  aspect-ratio: 4 / 3;
}
.page-about .media-frame--square img {
  aspect-ratio: 9 / 8;
}
.page-about .media-frame--wide img {
  aspect-ratio: 3 / 2;
}
.page-about .media-frame figcaption {
  padding: 10px 12px;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--ink-dim);
  border-top: 1px solid var(--hair);
}

/* ---------- 赛事区间 ---------- */
.page-about .range-stack {
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}
@media (min-width: 820px) {
  .page-about .range-stack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
}
.page-about .range-item {
  position: relative;
  background: var(--about-deep);
  padding: clamp(20px, 3vw, 28px) clamp(18px, 2.4vw, 26px) clamp(22px, 3vw, 30px);
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}
@media (min-width: 820px) {
  .page-about .range-item + .range-item {
    border-left: 1px solid var(--hair);
  }
  .page-about .range-item--b {
    background: rgba(13, 32, 48, .9);
  }
  .page-about .range-item--c {
    background: rgba(11, 27, 43, .94);
  }
}
.page-about .range-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}
.page-about .range-item--a::before {
  background: var(--grass);
}
.page-about .range-item--b::before {
  background: var(--grass-2);
}
.page-about .range-item--c::before {
  background: var(--flare);
}
.page-about .range-index {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--ink-dim);
}
.page-about .range-count {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--ink-dim);
}
.page-about .range-count .num {
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  color: var(--chalk);
  margin-right: 4px;
  display: inline-block;
}
.page-about .range-copy {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}
.page-about .range-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}
.page-about .range-list li {
  position: relative;
  padding-left: 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-dim);
}
.page-about .range-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 1px;
  background: var(--grid);
}

/* ---------- 团队 ---------- */
.page-about .crew-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}
@media (min-width: 860px) {
  .page-about .crew-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}
.page-about .crew-figure {
  margin: 0;
}
.page-about .crew-roles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .crew-roles li {
  background: var(--about-deep);
  padding: 12px 14px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-about .crew-num {
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1;
  color: var(--flare);
}
.page-about .crew-role {
  font-size: 13.5px;
  color: var(--ink-soft);
}
.page-about .crew-diagram {
  margin: clamp(26px, 4vw, 40px) 0 0;
}
.page-about .crew-diagram svg {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--hair);
  background: rgba(18, 41, 63, .5);
}
.page-about .crew-diagram .diagram-label {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  fill: var(--chalk);
}
.page-about .crew-diagram .diagram-sub {
  font-family: var(--font-body);
  font-size: 10.5px;
  fill: rgba(244, 247, 245, .55);
}
.page-about .crew-diagram figcaption {
  margin-top: 10px;
  font-size: 11.5px;
  color: var(--ink-dim);
}

.page-about .rhythm {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 760px) {
  .page-about .rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
}
.page-about .rhythm-step {
  position: relative;
  padding: 16px 18px 18px 0;
  border-top: 2px solid var(--grid);
  min-width: 0;
}
@media (min-width: 760px) {
  .page-about .rhythm-step {
    padding: 16px 22px 18px 16px;
  }
}
.page-about .rhythm-step--hot {
  border-top-color: var(--flare);
}
.page-about .rhythm-time {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--chalk);
}
.page-about .rhythm-step--hot .rhythm-time {
  color: var(--flare);
}
.page-about .rhythm-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ink-soft);
  max-width: 30ch;
}

/* ---------- 服务覆盖带 ---------- */
.page-about .region-band {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.6vw, 38px) clamp(18px, 3vw, 34px);
  border-left: 3px solid var(--flare);
  background: linear-gradient(97deg, rgba(31, 111, 74, .55) 0%, rgba(31, 111, 74, .2) 54%, rgba(18, 41, 63, .68) 100%);
}
.page-about .region-band::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 30%;
  background: rgba(255, 106, 19, .08);
  clip-path: polygon(48% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-about .region-headline {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}
.page-about .region-big {
  font-size: clamp(40px, 8vw, 76px);
  line-height: .86;
  color: var(--chalk);
  letter-spacing: -.03em;
}
.page-about .region-headline p {
  margin: 0;
  max-width: 26ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}
.page-about .region-cities {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(36, 64, 90, .9);
  border: 1px solid rgba(36, 64, 90, .9);
}
@media (min-width: 640px) {
  .page-about .region-cities {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}
.page-about .region-cities li {
  background: rgba(11, 27, 43, .82);
  padding: 8px 4px;
  text-align: center;
  font-size: 12.5px;
  color: var(--ink-soft);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .region-cities li:hover {
  background: rgba(47, 140, 96, .34);
  color: var(--chalk);
}
.page-about .region-foot {
  position: relative;
  z-index: 1;
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}
.page-about .region-foot .num {
  color: var(--chalk);
  font-size: 16px;
}

/* ---------- 赛季编年史 ---------- */
.page-about .season-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .season-track::before {
  content: "";
  position: absolute;
  left: 52px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--grid) 0%, rgba(36, 64, 90, .3) 100%);
  transform: skewX(-4deg);
  transform-origin: top;
}
@media (min-width: 760px) {
  .page-about .season-track::before {
    left: 80px;
  }
}
.page-about .season-node {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 0 18px;
  min-width: 0;
}
@media (min-width: 760px) {
  .page-about .season-node {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 28px;
  }
}
.page-about .season-year {
  position: relative;
  display: block;
  padding-top: 3px;
  padding-right: 14px;
  text-align: right;
  font-size: clamp(14px, 2.1vw, 18px);
  color: var(--ink-dim);
  transition: color var(--dur) var(--ease);
}
.page-about .season-year::after {
  content: "";
  position: absolute;
  right: 1px;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--night);
  border: 1px solid var(--grid);
  transform: rotate(45deg);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .season-node:hover .season-year,
.page-about .season-node[aria-current="true"] .season-year {
  color: var(--flare);
}
.page-about .season-node:hover .season-year::after {
  border-color: var(--flare);
  background: var(--flare);
}
.page-about .season-body {
  min-width: 0;
  padding-bottom: 4px;
}
.page-about .season-headline {
  margin: 0 0 8px;
  font-size: clamp(16px, 2.4vw, 20px);
  line-height: 1.4;
  font-weight: 700;
  color: var(--chalk);
}
.page-about .season-body p {
  margin: 0 0 12px;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-about .season-tags {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.page-about .tag {
  display: inline-block;
  padding: 4px 9px;
  border: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .02em;
  color: var(--ink-dim);
  background: rgba(18, 41, 63, .6);
}
.page-about .timeline-figure {
  margin: clamp(30px, 4.6vw, 46px) 0 0;
}
.page-about .about-bridge {
  margin: clamp(22px, 3vw, 30px) 0 0;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 合作接入 ---------- */
.page-about .join-grid {
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}
@media (min-width: 900px) {
  .page-about .join-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .join-item + .join-item {
    border-left: 1px solid var(--hair);
  }
}
.page-about .join-item {
  background: var(--about-deep);
  padding: clamp(20px, 3vw, 28px) clamp(18px, 2.4vw, 26px);
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}
.page-about .join-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--flare);
}
.page-about .join-title {
  margin: 0;
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.4;
  font-weight: 700;
  color: var(--chalk);
}
.page-about .join-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}
.page-about .join-flow {
  padding-top: 10px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 11.5px !important;
  color: var(--ink-dim) !important;
  letter-spacing: .02em;
}

.page-about .about-cta {
  margin-top: clamp(28px, 4vw, 42px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--hair);
  display: grid;
  gap: 16px;
}
@media (min-width: 720px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}
.page-about .about-cta-line {
  margin: 0;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.6;
  color: var(--chalk);
}
.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 520px) {
  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .region-headline {
    flex-direction: column;
    gap: 8px;
  }
  .page-about .region-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
  }
}
</main>