.page-about {
  --about-rail: 208px;
  --about-scroll: 110px;
  background: var(--c-night);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: clamp(14px, 2.4vw, 22px) 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-muted);
}

.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-line);
}

.page-about .crumbs__link {
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .28s var(--ease), border-color .28s var(--ease);
}

.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  color: var(--c-green);
  border-bottom-color: var(--c-green);
}

.page-about .crumbs__item[aria-current="page"] {
  color: var(--c-green);
}

/* ---------- 首屏坐标 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 36px) clamp(34px, 6vw, 68px);
  background:
    radial-gradient(120% 88% at 86% -6%, rgba(31, 214, 138, .18), transparent 58%),
    linear-gradient(180deg, var(--c-night) 0%, var(--c-turf) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(36, 70, 60, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 70, 60, .55) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 76%);
  pointer-events: none;
}

.page-about .about-hero .about-wrap {
  position: relative;
  z-index: 1;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 34px);
  margin-top: clamp(20px, 3.4vw, 38px);
}

.page-about .zone__tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-green);
}

.page-about .zone__tag::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--c-green);
}

.page-about .hero-h1 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 5.4vw, 68px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--c-text);
  text-wrap: balance;
}

.page-about .hero-lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.5vw, 18px);
  color: var(--c-muted);
}

.page-about .hero-media,
.page-about .shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
}

.page-about .hero-media {
  aspect-ratio: 16 / 11;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

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

.page-about .hero-media img {
  filter: saturate(.92) contrast(1.06);
}

.page-about .shot__cap {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-text);
  background: rgba(5, 19, 15, .82);
  border-left: 2px solid var(--c-green);
}

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

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 0 16px 18px;
  border-bottom: 1px solid var(--c-line);
  position: relative;
}

.page-about .stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 6px;
  height: 6px;
  background: var(--c-green);
  transform: rotate(45deg);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__unit {
  font-size: .52em;
  margin-left: 2px;
  color: var(--c-mint);
}

.page-about .stat__label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-muted);
}

/* ---------- 章节刻度 ---------- */

.page-about .field-layout {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .rail {
  position: sticky;
  top: 0;
  z-index: 4;
  margin: 0 calc(var(--gut) * -1) clamp(28px, 5vw, 44px);
  padding: 10px var(--gut);
  background: linear-gradient(180deg, var(--c-night) 62%, rgba(5, 19, 15, .88));
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--c-line);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .rail__cap {
  display: none;
}

.page-about .rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--c-muted);
  text-decoration: none;
  border: 1px solid var(--c-line);
  transition: color .28s var(--ease), border-color .28s var(--ease), background-color .28s var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link:focus-visible {
  color: var(--c-green);
  border-color: var(--c-green);
  background: rgba(31, 214, 138, .09);
}

.page-about .rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-cyan);
}

/* ---------- 分区通用 ---------- */

.page-about .zone {
  padding-block: clamp(32px, 5vw, 54px);
  scroll-margin-top: var(--about-scroll);
}

.page-about .zone + .zone {
  border-top: 1px solid var(--c-line);
}

.page-about .zone__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .zone__head h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.3vw, 40px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--c-text);
}

.page-about .zone__lede {
  margin: 0;
  max-width: 58ch;
  color: var(--c-muted);
}

.page-about h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-text);
}

.page-about .zone p {
  margin: 0;
}

.page-about .shot {
  aspect-ratio: 16 / 9;
}

/* ---------- 中场：三个场景 ---------- */

.page-about .scenarios {
  display: grid;
}

.page-about .scenario {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-top: 1px solid var(--c-line);
  transition: border-color .3s var(--ease);
}

.page-about .scenario:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .scenario:hover {
  border-top-color: var(--c-green);
}

.page-about .scenario__mark {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--c-green);
}

.page-about .scenario__body p {
  max-width: 64ch;
  color: var(--c-muted);
}

/* ---------- 后场：数据来源 ---------- */

.page-about .zone--back {
  background: linear-gradient(158deg, var(--c-turf), rgba(18, 53, 43, .5) 72%);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-green);
  padding: clamp(22px, 4vw, 42px);
  margin-block: clamp(22px, 4vw, 40px);
}

.page-about .sources {
  display: grid;
  gap: 14px;
}

.page-about .source {
  padding: 16px 18px 18px;
  background: rgba(5, 19, 15, .58);
  border: 1px solid var(--c-line);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .source:hover {
  border-color: var(--c-green);
  transform: translateY(-2px);
}

.page-about .source h3 {
  font-size: clamp(16px, 1.8vw, 19px);
}

.page-about .source p {
  font-size: 15px;
  color: var(--c-muted);
}

.page-about .tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.page-about .tag--cyan {
  color: var(--c-cyan);
  border: 1px solid rgba(53, 199, 216, .45);
  background: rgba(53, 199, 216, .1);
}

.page-about .tag--green {
  color: var(--c-green);
  border: 1px solid rgba(31, 214, 138, .45);
  background: rgba(31, 214, 138, .1);
}

.page-about .tag--amber {
  color: var(--c-amber);
  border: 1px solid rgba(245, 165, 36, .45);
  background: rgba(245, 165, 36, .1);
}

.page-about .shot--back {
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .crosscheck {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .crosscheck__col {
  padding-left: 16px;
  border-left: 2px solid var(--c-cyan);
  transition: border-color .3s var(--ease);
}

.page-about .crosscheck__col:hover {
  border-left-color: var(--c-green);
}

.page-about .crosscheck__cap {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-cyan);
}

.page-about .crosscheck__txt {
  font-size: 15px;
  color: var(--c-muted);
}

/* ---------- 前场：使用体验 ---------- */

.page-about .feels {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .feel {
  position: relative;
  padding-top: clamp(16px, 2.4vw, 22px);
  border-top: 1px solid var(--c-line);
}

.page-about .feel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 42px;
  height: 2px;
  background: var(--c-cyan);
  transition: width .38s var(--ease), background-color .38s var(--ease);
}

.page-about .feel:hover::before {
  width: 96px;
  background: var(--c-green);
}

.page-about .feel p {
  color: var(--c-muted);
}

/* ---------- 边线：赛季刻度 ---------- */

.page-about .shot--line {
  aspect-ratio: 3 / 2;
  margin-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .tl {
  position: relative;
  padding: 0 0 22px 22px;
  border-left: 1px solid var(--c-line);
  transition: border-color .3s var(--ease);
}

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

.page-about .tl:hover {
  border-left-color: var(--c-green);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--c-night);
  border: 2px solid var(--c-amber);
  transform: rotate(45deg);
  transition: background-color .3s var(--ease);
}

.page-about .tl:hover::before {
  background: var(--c-amber);
}

.page-about .tl__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__title {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
}

.page-about .tl__desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 看台：团队与服务 ---------- */

.page-about .zone--stand {
  background: linear-gradient(202deg, rgba(18, 53, 43, .92), var(--c-night));
  border: 1px solid var(--c-line);
  padding: clamp(22px, 4vw, 42px);
  margin-block: clamp(22px, 4vw, 40px);
}

.page-about .stand-facts {
  display: grid;
  gap: 0;
  margin: 0 0 clamp(22px, 3.4vw, 32px);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}

.page-about .sfact {
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .sfact__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-green);
  font-variant-numeric: tabular-nums;
}

.page-about .sfact__l {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-muted);
}

.page-about .stand-body h3 {
  font-size: clamp(17px, 1.9vw, 21px);
}

.page-about .stand-list {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .stand-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  color: var(--c-muted);
}

.page-about .stand-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--c-green);
}

.page-about .stand-note {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .02em;
  color: var(--c-muted);
  padding-top: 14px;
  border-top: 1px dashed var(--c-line);
}

/* ---------- 通道：替代路径 ---------- */

.page-about .zone--gate {
  padding-bottom: 0;
}

.page-about .ways {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
}

.page-about .way {
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
  transition: border-color .3s var(--ease);
}

.page-about .way:hover {
  border-top-color: var(--c-cyan);
}

.page-about .way p {
  font-size: 15px;
  color: var(--c-muted);
}

.page-about .gate-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .gate-link {
  display: inline-flex;
  align-items: center;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  text-decoration: none;
  border: 1px solid var(--c-line);
  background: rgba(31, 214, 138, .06);
  transition: background-color .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease), transform .3s var(--ease);
}

.page-about .gate-link:hover,
.page-about .gate-link:focus-visible {
  border-color: var(--c-green);
  background: rgba(31, 214, 138, .16);
  color: var(--c-green);
  transform: translateY(-2px);
}

.page-about .gate-link--solid {
  background: var(--c-green);
  border-color: var(--c-green);
  color: var(--c-night);
}

.page-about .gate-link--solid:hover,
.page-about .gate-link--solid:focus-visible {
  background: var(--c-mint);
  border-color: var(--c-mint);
  color: var(--c-night);
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--c-line);
  }

  .page-about .stat {
    border-bottom: 0;
    padding: 18px 18px 18px 20px;
  }

  .page-about .stat + .stat {
    border-left: 1px solid var(--c-line);
  }

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

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

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

@media (min-width: 760px) {
  .page-about .sources {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .sfact {
    padding: 16px 18px;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
  }

  .page-about .sfact:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

@media (min-width: 920px) {
  .page-about .hero-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: end;
    gap: clamp(24px, 3vw, 40px);
  }

  .page-about .hero-lead {
    grid-column: 1 / span 7;
  }

  .page-about .hero-media {
    grid-column: 8 / span 5;
  }

  .page-about .hero-stats {
    grid-column: 1 / -1;
  }

  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .tl {
    padding: 30px 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--c-line);
  }

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

  .page-about .tl::before {
    left: 0;
    top: -5px;
  }

  .page-about .shot--line {
    aspect-ratio: 21 / 9;
  }
}

@media (min-width: 1060px) {
  .page-about .field-layout {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .page-about .rail {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    margin: 0;
    padding: 0 0 0 16px;
    background: none;
    backdrop-filter: none;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
    overflow: visible;
  }

  .page-about .rail__cap {
    display: block;
    margin: 0 0 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--c-muted);
  }

  .page-about .rail__list {
    display: block;
  }

  .page-about .rail__item + .rail__item {
    margin-top: 14px;
  }

  .page-about .rail__link {
    position: relative;
    display: block;
    padding: 5px 0 5px 12px;
    border: 0;
    background: none;
    white-space: normal;
  }

  .page-about .rail__link::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--c-green);
    transform: translateY(-50%);
    transition: height .32s var(--ease);
  }

  .page-about .rail__link:hover,
  .page-about .rail__link:focus-visible {
    background: none;
    color: var(--c-green);
  }

  .page-about .rail__link:hover::after,
  .page-about .rail__link:focus-visible::after {
    height: 100%;
  }

  .page-about .rail__no {
    display: block;
    margin-bottom: 2px;
    color: var(--c-cyan);
  }

  .page-about .rail__tx {
    display: block;
    font-size: 13px;
    line-height: 1.5;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}