.page-about {
  --about-rail-w: 236px;
  --about-plate-bg: #16253A;
}

.page-about .about-crumb-wrap {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(22px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 8vw, 68px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__title span {
  color: var(--pitch);
  background-image: linear-gradient(transparent 62%, rgba(56, 225, 198, .5) 62%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--paper-2);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 8;
  object-fit: cover;
}

.page-about .about-hero__media .archive-tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  background: var(--paper);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-origin__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 44px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-origin__prose p {
  margin: 0 0 16px;
  color: var(--ink);
}

.page-about .about-origin__prose p:first-child::first-letter {
  float: left;
  font-family: var(--font-display);
  font-size: 3.1em;
  line-height: .86;
  font-weight: 700;
  padding: 4px 10px 0 0;
  color: var(--pitch);
}

/* ---------- 三方协作 ---------- */
.page-about .about-crew__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: crew;
}

.page-about .about-crew__step {
  position: relative;
  padding: 24px 22px 22px;
  border-radius: var(--r-md);
  background: var(--card);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crew__step:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-crew__no {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .about-crew__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-crew__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 赛季沿革 ---------- */
.page-about .about-track {
  background: var(--paper);
}

.page-about .about-track__head {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .about-track__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-track__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-rail__head {
  margin: 0 0 10px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-rail__link {
  display: block;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hair);
  background: var(--paper-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
}

.page-about .about-timeline {
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--hair);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .about-timeline__item.timeline__item--live::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(56, 225, 198, .22);
}

.page-about .about-timeline__meta {
  margin: 0 0 6px;
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.2vw, 25px);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-sm);
  line-height: 1.82;
  color: var(--ink);
}

.page-about .about-timeline__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 14px 0 0;
}

/* ---------- 深色说明牌 ---------- */
.page-about .about-plates {
  color: var(--chalk);
}

.page-about .about-plates__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5.4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--chalk);
}

.page-about .about-plates__note {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(244, 241, 232, .7);
}

.page-about .about-plates__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .about-plate {
  position: relative;
  padding: 22px 22px 20px;
  border-radius: var(--r-md);
  background: var(--about-plate-bg);
  border: 1px solid var(--hair-dark);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-plate:hover,
.page-about .about-plate:focus {
  transform: translateY(-2px);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-plate__no {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .about-plate__front {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-plate__back {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: rgba(244, 241, 232, .74);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}

.page-about .about-plate:hover .about-plate__back,
.page-about .about-plate:focus .about-plate__back,
.page-about .about-plate:focus-within .about-plate__back {
  max-height: 8em;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 归档字段 ---------- */
.page-about .about-field {
  background: var(--paper-2);
}

.page-about .about-field__split {
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-field__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 5.2vw, 42px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-field__intro {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-field__list {
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px dashed var(--hair);
}

.page-about .about-field__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--hair);
}

.page-about .about-field__row dt {
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .about-field__row dd {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-field__media {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--card);
  box-shadow: var(--shadow-card);
}

.page-about .about-field__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-about .about-field__media .archive-tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  color: var(--chalk);
}

.page-about .about-reach__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 5.2vw, 42px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--chalk);
}

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-reach__card {
  padding: 22px 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--hair-dark);
  background: rgba(244, 241, 232, .04);
}

.page-about .about-reach__card--cyan {
  border-color: rgba(56, 225, 198, .45);
  background: rgba(56, 225, 198, .08);
}

.page-about .about-reach__card--gold {
  border-color: rgba(198, 162, 76, .45);
  background: rgba(198, 162, 76, .1);
}

.page-about .about-reach__label {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: rgba(244, 241, 232, .62);
}

.page-about .about-reach__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 12px 0 0;
}

.page-about .about-reach__stat .stat__num {
  font-family: var(--font-display);
  font-size: clamp(34px, 7vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-reach__card--gold .stat__num {
  color: var(--gold);
}

.page-about .about-reach__stat .stat__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: rgba(244, 241, 232, .74);
}

.page-about .about-reach__text {
  margin: 12px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: rgba(244, 241, 232, .84);
}

.page-about .about-reach__community {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(32px, 5vw, 56px);
  align-items: center;
}

.page-about .about-reach__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--night);
  border: 1px solid var(--hair-dark);
}

.page-about .about-reach__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 43 / 32;
  object-fit: cover;
}

.page-about .about-reach__prose {
  color: rgba(244, 241, 232, .86);
}

.page-about .about-reach__prose h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-reach__prose p {
  margin: 0 0 14px;
  font-size: var(--fs-sm);
  line-height: 1.82;
  color: rgba(244, 241, 232, .86);
}

.page-about .about-reach__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

/* ---------- 品牌自述 ---------- */
.page-about .about-voice {
  background: var(--paper);
}

.page-about .about-voice__box {
  position: relative;
  padding: clamp(28px, 5vw, 56px) clamp(22px, 4vw, 56px);
  border-radius: var(--r-lg);
  background: var(--card);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-voice__box::after {
  content: "";
  position: absolute;
  right: clamp(-40px, -3vw, -10px);
  top: -60px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(255, 138, 61, .22), rgba(255, 138, 61, 0) 68%);
  pointer-events: none;
}

.page-about .about-voice__quote {
  margin: 14px 0 0;
  max-width: 40ch;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-voice__sign {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-voice__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 回到顶部 ---------- */
.page-about .about-totop__wrap {
  padding-top: 8px;
  padding-bottom: clamp(28px, 5vw, 48px);
  background: var(--paper);
}

.page-about .about-totop {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--r-pill);
  border: 1px solid var(--hair);
  background: var(--paper-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  color: var(--ink);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-totop:hover,
.page-about .about-totop:focus-visible {
  background: var(--night);
  border-color: var(--night);
  color: var(--chalk);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

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

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

  .page-about .about-field__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }

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

  .page-about .about-reach__community {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-track__layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list li + li {
    margin-top: 6px;
  }

  .page-about .about-rail__link {
    border-radius: var(--r-sm);
    border-color: transparent;
    background: transparent;
    padding: 9px 14px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(56, 225, 198, .18);
    border-color: rgba(56, 225, 198, .5);
    color: var(--ink);
  }

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

@media (min-width: 1180px) {
  .page-about .about-field__split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__step,
  .page-about .about-plate,
  .page-about .about-rail__link,
  .page-about .about-totop {
    transition: none;
  }

  .page-about .about-plate:hover,
  .page-about .about-plate:focus,
  .page-about .about-crew__step:hover {
    transform: none;
  }
}
</main>