.page-about {
  --about-hair: rgba(201, 162, 39, 0.22);
  --about-line: rgba(201, 220, 210, 0.18);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--warm);
  background:
    radial-gradient(120% 92% at 84% 4%, rgba(201, 162, 39, 0.20), transparent 58%),
    linear-gradient(158deg, var(--green-900) 0%, var(--green-800) 52%, var(--green-700) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 66%;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--about-hair) 24%, rgba(201, 162, 39, 0) 96%);
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  padding-bottom: clamp(56px, 9vw, 112px);
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__item,
.page-about .about-hero .breadcrumb__current {
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 66px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.9;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
  margin-top: clamp(14px, 2vw, 24px);
  padding-top: 26px;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--glow);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 通用栏目标题 ---------- */
.page-about .about-head {
  display: grid;
  gap: 14px;
  max-width: 74ch;
  margin-bottom: clamp(30px, 5vw, 58px);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.16;
}

.page-about .about-head__lead {
  margin: 0;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.9;
}

.page-about .section--deep .about-head__lead,
.page-about .about-miles-section .about-head__lead {
  color: var(--mist);
}

.page-about .section--mist {
  color: var(--ink);
}

.page-about .section--mist .about-head__lead {
  color: var(--ink-muted);
}

/* ---------- 沿革时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: clamp(34px, 5vw, 60px);
  padding-left: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--green-600) 10%, var(--green-600) 90%, transparent);
  transform: skewX(-8deg);
  transform-origin: top left;
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 0;
  border: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 16px;
  width: 30px;
  height: 2px;
  background: var(--gold);
  opacity: 0.45;
  transition: opacity 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-node.is-active::before {
  opacity: 1;
  background: var(--glow);
}

.page-about .about-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 54px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--green-600);
  transition: color 0.35s var(--ease);
}

.page-about .about-node.is-active .about-node__year {
  color: var(--glow);
}

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

.page-about .about-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.2vw, 23px);
  color: var(--warm);
}

.page-about .about-node__text {
  margin: 0 0 12px;
  max-width: 64ch;
  color: var(--mist);
  line-height: 1.88;
}

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

.page-about .about-inline-link {
  color: var(--glow);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 2px;
}

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

.page-about .about-node__media {
  margin: 24px 0 0;
  max-width: 540px;
}

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

.page-about .section--deep .media__caption {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队分工切换 ---------- */
.page-about .about-tabs {
  position: relative;
}

.page-about .about-tabs__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-tabs__label {
  display: inline-block;
  padding: 11px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--green-800);
  background: var(--warm);
  border: 1px solid rgba(18, 58, 46, 0.18);
  clip-path: var(--cut-sm);
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-tabs__label:hover {
  border-color: var(--green-600);
}

.page-about .about-tabs__panels {
  padding: clamp(22px, 3vw, 38px);
  background: var(--warm);
  border-top: 3px solid var(--cinnabar);
  clip-path: var(--cut-md);
}

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

.page-about .about-tabs__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--green-900);
}

.page-about .about-tabs__text {
  margin: 0;
  max-width: 66ch;
  color: var(--ink-muted);
  line-height: 1.9;
}

.page-about .about-duties {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-duties li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 10px;
  height: 2px;
  background: var(--gold);
}

.page-about #about-tab-rules:checked ~ .about-tabs__list label[for="about-tab-rules"],
.page-about #about-tab-bank:checked ~ .about-tabs__list label[for="about-tab-bank"],
.page-about #about-tab-service:checked ~ .about-tabs__list label[for="about-tab-service"],
.page-about #about-tab-session:checked ~ .about-tabs__list label[for="about-tab-session"] {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--warm);
}

.page-about #about-tab-rules:focus-visible ~ .about-tabs__list label[for="about-tab-rules"],
.page-about #about-tab-bank:focus-visible ~ .about-tabs__list label[for="about-tab-bank"],
.page-about #about-tab-service:focus-visible ~ .about-tabs__list label[for="about-tab-service"],
.page-about #about-tab-session:focus-visible ~ .about-tabs__list label[for="about-tab-session"] {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about #about-tab-rules:checked ~ .about-tabs__panels [data-panel="rules"],
.page-about #about-tab-bank:checked ~ .about-tabs__panels [data-panel="bank"],
.page-about #about-tab-service:checked ~ .about-tabs__panels [data-panel="service"],
.page-about #about-tab-session:checked ~ .about-tabs__panels [data-panel="session"] {
  display: block;
}

/* ---------- 每月复核 ---------- */
.page-about .about-review {
  background: var(--green-900);
  color: var(--warm);
}

.page-about .about-review__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-steps {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-step__num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  color: var(--warm);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-review__figure {
  margin: 0;
}

.page-about .about-review__figure .media__caption {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 覆盖与体验点 ---------- */
.page-about .about-cover__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-cover__figure {
  margin: 0 auto;
  width: 100%;
  max-width: 420px;
}

.page-about .about-cover__plate {
  position: relative;
  aspect-ratio: 5 / 6;
  overflow: hidden;
  background: var(--green-900);
  clip-path: var(--cut-lg);
}

.page-about .about-cover__plate img {
  opacity: 0.42;
}

.page-about .about-cover__map {
  position: absolute;
  inset: 6% 12%;
  width: 76%;
  height: 88%;
}

.page-about .about-cover__cap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted);
}

.page-about .about-points {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-point {
  padding-left: 18px;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-point__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  color: var(--green-900);
}

.page-about .about-point__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-muted);
}

.page-about .about-cover__note {
  margin: clamp(24px, 3vw, 32px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-muted);
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
}

/* ---------- 赛季与里程碑 ---------- */
.page-about .about-miles-section {
  background:
    radial-gradient(110% 80% at 12% 0%, rgba(28, 84, 66, 0.55), transparent 60%),
    var(--green-900);
  color: var(--warm);
}

.page-about .about-miles {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-mile {
  padding: clamp(20px, 2.6vw, 28px);
  background: rgba(245, 241, 230, 0.05);
  border-top: 2px solid var(--green-600);
  clip-path: var(--cut-md);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-mile:hover,
.page-about .about-mile:focus-within {
  transform: translateY(-6px);
  border-top-color: var(--gold);
  background: rgba(245, 241, 230, 0.09);
}

.page-about .about-mile__tag {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-mile__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--glow);
}

.page-about .about-mile__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  color: var(--warm);
}

.page-about .about-mile__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 双出口 ---------- */
.page-about .about-exit__title {
  margin: 0 0 clamp(22px, 3vw, 34px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.2;
  color: var(--warm);
}

.page-about .about-exit__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 26px);
}

.page-about .about-exit__card {
  padding: clamp(24px, 3vw, 34px);
  background: var(--warm);
  border-top: 3px solid var(--green-600);
  clip-path: var(--cut-md);
}

.page-about .about-exit__card--accent {
  border-top-color: var(--cinnabar);
}

.page-about .about-exit__card-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.2vw, 23px);
  color: var(--green-900);
}

.page-about .about-exit__card-text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-muted);
}

.page-about .about-exit__links {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: 14px;
  line-height: 2;
  color: var(--mist);
}

.page-about .about-exit__links a {
  color: var(--glow);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 1px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 clamp(16px, 2.4vw, 32px);
  }

  .page-about .about-tabs__panels {
    min-height: 24rem;
  }

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

@media (min-width: 960px) {
  .page-about .about-node {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: clamp(24px, 3vw, 48px);
    align-items: start;
  }

  .page-about .about-node::before {
    top: 22px;
  }

  .page-about .about-node__year {
    font-size: 56px;
  }

  .page-about .about-review__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .about-cover__figure {
    margin: 0;
    max-width: 440px;
  }

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

@media (min-width: 1140px) {
  .page-about .about-miles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-node__year,
  .page-about .about-mile,
  .page-about .about-tabs__label {
    transition: none;
  }

  .page-about .about-mile:hover,
  .page-about .about-mile:focus-within {
    transform: none;
  }
}