.page-about {
  --about-cut: 18px;
  --about-rail: 200px;
  position: relative;
  display: block;
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .about-hero-grid,
.page-about .journey-grid,
.page-about .team-layout,
.page-about .coverage-grid,
.page-about .version-layout,
.page-about .partner-grid {
  min-width: 0;
}

.page-about .about-hero-grid > *,
.page-about .journey-grid > *,
.page-about .team-layout > *,
.page-about .coverage-grid > *,
.page-about .version-layout > * {
  min-width: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--bar-h) + 24px) 0 64px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 78% at 92% 0%, rgba(43, 227, 192, 0.13), transparent 58%),
    linear-gradient(160deg, rgba(12, 33, 25, 0.92) 0%, rgba(6, 19, 15, 1) 64%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: 16%;
  width: 44%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  transform: rotate(-12deg);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 30px;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-hero-lead .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero-lead h1 {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-size: var(--step-64);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero-lead .prose {
  max-width: 62ch;
}

.page-about .about-hero-lead .prose + .prose {
  margin-top: 16px;
}

.page-about .about-hero-panel {
  display: grid;
  gap: 20px;
  align-content: start;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.page-about .about-hero-panel .data-card {
  padding: 0 0 0 14px;
  border-left: 2px solid var(--cyan);
  background: none;
  border-radius: 0;
}

.page-about .data-label {
  margin: 0 0 5px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .data-value {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .data-value--cyan {
  color: var(--cyan);
}

.page-about .data-note {
  margin: 5px 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 通用章节 ---------- */

.page-about .section {
  position: relative;
  padding: 68px 0;
}

.page-about .section--band {
  background: linear-gradient(180deg, var(--ink-800) 0%, rgba(12, 33, 25, 0.58) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .section-head {
  display: grid;
  gap: 12px;
  margin-bottom: 40px;
  max-width: 78ch;
}

.page-about .section-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .section-index::after {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--cyan);
  transform: skewX(-12deg);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--step-40);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .section-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 64ch;
}

.page-about .prose {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-frame--3-2 {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame--4-3 {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 58%;
  background: linear-gradient(180deg, transparent, rgba(6, 19, 15, 0.92));
  pointer-events: none;
}

.page-about .media-caption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 14px;
  z-index: 2;
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 赛季历程 ---------- */

.page-about .journey-figure {
  margin-bottom: 48px;
}

.page-about .journey-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .season-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .season-tick {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .season-tick:hover,
.page-about .season-tick:focus-visible {
  color: var(--cyan-soft);
  border-color: var(--cyan);
  background: rgba(43, 227, 192, 0.08);
}

.page-about .tick-no {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .season-steps {
  display: grid;
  gap: 0;
}

.page-about .season-step {
  position: relative;
  padding-bottom: 38px;
  margin-bottom: 38px;
  border-bottom: 1px solid rgba(62, 92, 82, 0.5);
  scroll-margin-top: calc(var(--bar-h) + 32px);
}

.page-about .season-step:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .season-step::before {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-bottom: 18px;
  background: var(--cyan);
  transform: skewX(-12deg);
}

.page-about .season-meta {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .season-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: var(--step-28);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .season-step .prose {
  max-width: 58ch;
}

.page-about .season-steps .season-step:nth-child(even) .prose {
  max-width: 50ch;
}

/* ---------- 团队 ---------- */

.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .team-figure {
  align-self: start;
}

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

.page-about .team-card {
  position: relative;
  padding: 20px 22px;
  background: var(--ink-700);
  border-left: 2px solid var(--line);
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within,
.page-about .team-card:focus {
  border-left-color: var(--cyan);
  background: #164034;
  outline: none;
}

.page-about .team-card:focus-visible {
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .team-count {
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-role {
  margin: 0;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .team-brief {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .team-detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.45s var(--ease), opacity 0.32s var(--ease), margin-top 0.45s var(--ease);
}

.page-about .team-detail ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .team-detail li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .team-detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .team-card:hover .team-detail,
.page-about .team-card:focus-within .team-detail,
.page-about .team-card:focus .team-detail {
  max-height: 280px;
  opacity: 1;
  margin-top: 14px;
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .coverage-copy .prose + .prose {
  margin-top: 16px;
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .coverage-stats > div {
  padding: 18px 16px;
  background: var(--ink-900);
}

.page-about .coverage-stats dt {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .coverage-stats dd {
  margin: 10px 0 0;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-figure {
  align-self: center;
}

/* ---------- 版本 ---------- */

.page-about .version-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

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

.page-about .version-track li {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(62, 92, 82, 0.45);
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .version-track li:first-child {
  border-top: 1px solid rgba(62, 92, 82, 0.45);
}

.page-about .version-mark {
  align-self: start;
  margin-top: 8px;
  width: 10px;
  height: 10px;
  border: 1px solid var(--cyan);
  background: rgba(43, 227, 192, 0.12);
  transform: rotate(45deg);
}

.page-about .version-track li:first-child .version-mark {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 227, 192, 0.14);
}

.page-about .version-actions .prose {
  margin-bottom: 22px;
}

/* ---------- 三件事 ---------- */

.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .principles > li {
  position: relative;
  padding-top: 24px;
}

.page-about .principles > li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .principles > li::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 52px;
  height: 2px;
  background: var(--cyan);
  transform: skewX(-12deg);
}

.page-about .principle-num {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .principle h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: var(--step-28);
  line-height: 1.3;
  color: var(--paper);
}

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

/* ---------- 合作与荣誉 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .partner-card {
  padding: 26px 22px;
  background: linear-gradient(150deg, var(--ink-700) 0%, rgba(18, 50, 42, 0.5) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .partner-figure {
  display: block;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-card h3 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .partner-card p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .partner-note {
  margin-top: 30px;
  max-width: 68ch;
}

/* ---------- 收束 ---------- */

.page-about .about-outro {
  position: relative;
  overflow: hidden;
  padding: 62px 0 88px;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(90% 70% at 8% 100%, rgba(43, 227, 192, 0.1), transparent 62%),
    linear-gradient(160deg, rgba(12, 33, 25, 0.8) 0%, rgba(6, 19, 15, 1) 70%);
}

.page-about .about-outro::after {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0.7;
}

.page-about .about-outro .prose {
  margin-top: 18px;
  max-width: 66ch;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .section {
    padding: 80px 0;
  }

  .page-about .coverage-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .journey-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .season-rail {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0 0 0 18px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .season-tick {
    position: relative;
    padding: 9px 0;
    border: 0;
    border-radius: 0;
    background: none;
  }

  .page-about .season-tick::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 50%;
    width: 10px;
    height: 2px;
    background: var(--line);
    transform: translateY(-50%) skewX(-12deg);
    transition: width 0.3s var(--ease), background-color 0.3s var(--ease);
  }

  .page-about .season-tick:hover::before,
  .page-about .season-tick:focus-visible::before {
    width: 16px;
    background: var(--cyan);
  }

  .page-about .season-tick:hover,
  .page-about .season-tick:focus-visible {
    background: none;
    border-color: transparent;
  }

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

  .page-about .principles > li {
    padding-right: 32px;
  }

  .page-about .principles > li + li {
    padding-left: 32px;
  }
}

@media (min-width: 960px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .version-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 56px;
    align-items: start;
  }
}

@media (max-width: 899px) {
  .page-about .about-hero-panel {
    padding-left: 16px;
    gap: 16px;
  }
}

@media (hover: none) {
  .page-about .team-detail {
    max-height: none;
    opacity: 1;
    margin-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-tick,
  .page-about .team-card,
  .page-about .team-detail,
  .page-about .season-tick::before {
    transition: none;
  }
}