.page-about {
  --about-line: rgba(201, 211, 227, 0.16);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(40px, 7vw, 88px)) 0 clamp(38px, 5vw, 66px);
  background:
    radial-gradient(120% 80% at 84% 0%, rgba(47, 242, 200, 0.14), transparent 62%),
    radial-gradient(90% 70% at 4% 100%, rgba(255, 106, 43, 0.1), transparent 58%),
    linear-gradient(180deg, #0a1130 0%, var(--ink) 72%);
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(201, 211, 227, 0.05) 0 1px,
    transparent 1px 7px
  );
  pointer-events: none;
}

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

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 46px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--hairline-strong);
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

.page-about .hero-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .hero-title {
  font-size: clamp(2.15rem, 7vw, 5rem);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 17ch;
  color: var(--paper);
}

.page-about .hero-lede {
  margin: 20px 0 0;
  max-width: 56ch;
  color: var(--silver);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .season-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(62px, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .season-strip li {
  border-top: 1px solid var(--hairline);
  padding-top: 8px;
}

.page-about .season-strip li:last-child {
  color: var(--cyan);
  border-top-color: var(--cyan);
}

.page-about .stat-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .stat-bar li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: linear-gradient(160deg, rgba(24, 36, 76, 0.92), rgba(8, 13, 36, 0.72));
}

.page-about .stat-num {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1;
}

.page-about .stat-label {
  color: var(--muted);
}

.page-about .about-index {
  margin-top: clamp(26px, 4vw, 42px);
  padding-top: 16px;
  border-top: 1px solid var(--hairline);
}

.page-about .about-index ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  color: var(--silver);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .idx {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(52px, 8vw, 104px) 0;
}

.page-about .section-head {
  max-width: 780px;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .section-head--tight {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .section-title {
  margin: 12px 0 0;
  font-size: clamp(1.6rem, 4.2vw, 3rem);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .section-lede {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.8;
}

/* ---------- 时间线 ---------- */
.page-about .timeline-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 0 100%);
}

.page-about .about-timeline {
  counter-reset: season;
}

.page-about .tl-item {
  counter-increment: season;
  position: relative;
  border-top: 1px solid var(--about-line);
  padding: 20px 0;
  transition: background 0.25s var(--ease);
}

.page-about .tl-item:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .tl-item[open] {
  background: linear-gradient(180deg, rgba(24, 36, 76, 0.42), transparent 72%);
}

.page-about .tl-item::before {
  content: "SEASON " counter(season, decimal-leading-zero);
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .tl-summary {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 12px;
  list-style: none;
  cursor: pointer;
  outline-offset: 4px;
}

.page-about .tl-summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-season {
  color: var(--cyan);
}

.page-about .tl-mark {
  grid-column: 4;
  grid-row: 1;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--silver);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tl-mark::before {
  content: "+";
}

.page-about .tl-item[open] .tl-mark::before {
  content: "\2013";
}

.page-about .tl-item[open] .tl-mark {
  color: var(--cyan);
  border-color: rgba(47, 242, 200, 0.5);
}

.page-about .tl-title {
  grid-column: 1 / -1;
  grid-row: 2;
  font-size: clamp(1.12rem, 2.4vw, 1.55rem);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl-body {
  margin-top: 14px;
  max-width: 66ch;
  color: var(--silver);
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .tl-body p {
  margin: 0 0 10px;
}

.page-about .tl-body p:last-child {
  margin-bottom: 0;
}

.page-about .tl-body ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.page-about .tl-body li {
  margin-bottom: 6px;
}

.page-about .tl-body li::marker {
  color: var(--orange);
}

/* ---------- 内容生产 ---------- */
.page-about .about-process {
  background: linear-gradient(180deg, rgba(17, 26, 61, 0.55), transparent 76%);
}

.page-about .process-split {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .flow {
  display: grid;
  gap: 16px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  position: relative;
  padding: 2px 0 2px 18px;
  border-left: 1px solid var(--about-line);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .flow-num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .flow-step h3 {
  margin: 4px 0 6px;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .process-figure {
  margin: 0;
}

/* ---------- 版本演进 ---------- */
.page-about .version-grid {
  display: grid;
  gap: 16px;
}

.page-about .version-card {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .version-card h3 {
  margin: 10px 0 14px;
  font-size: clamp(1.08rem, 2vw, 1.42rem);
  font-weight: 500;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .version-card .label {
  color: var(--cyan);
}

.page-about .version-card--desktop .label {
  color: var(--signal);
}

.page-about .version-card ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .version-card li {
  position: relative;
  padding-left: 16px;
  font-size: 14.2px;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .version-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .version-card--desktop li::before {
  background: var(--signal);
}

.page-about .version-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 26px;
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .version-note p {
  flex: 1 1 320px;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 斜切图片带 ---------- */
.page-about .about-band {
  padding: clamp(12px, 3vw, 28px) 0;
}

.page-about .band-figure {
  position: relative;
  margin: 0;
}

.page-about .band-figure img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  filter: saturate(0.82) contrast(1.06);
}

.page-about .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 项目覆盖 ---------- */
.page-about .sport-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(178px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .sport-card {
  position: relative;
  padding: 20px 18px 22px;
  background: linear-gradient(165deg, rgba(24, 36, 76, 0.94), rgba(12, 19, 45, 0.94));
  transition: background 0.25s var(--ease);
}

.page-about .sport-card:hover {
  background: linear-gradient(165deg, rgba(31, 47, 92, 0.96), rgba(14, 22, 52, 0.96));
}

.page-about .sport-card--more {
  background: linear-gradient(165deg, rgba(47, 242, 200, 0.13), rgba(8, 13, 36, 0.92));
}

.page-about .sport-idx {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .sport-card h3 {
  margin: 8px 0 6px;
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .sport-card p {
  margin: 0;
  font-size: 13.4px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .sport-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: 18px;
  padding: clamp(18px, 3vw, 26px);
}

.page-about .sport-note p {
  flex: 1 1 340px;
  margin: 0;
  font-size: 14.2px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .team-roles {
  display: grid;
  gap: 10px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-roles li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--hairline-soft);
  font-size: 14px;
  line-height: 1.68;
  color: var(--silver);
}

.page-about .team-roles .role {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .team-duty {
  padding: clamp(20px, 3vw, 28px);
}

.page-about .team-duty dl {
  display: grid;
  gap: 16px;
  margin: 0;
}

.page-about .team-duty dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .team-duty dd {
  margin: 5px 0 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--paper);
}

/* ---------- 长期价值 ---------- */
.page-about .about-value {
  background: linear-gradient(180deg, transparent, rgba(17, 26, 61, 0.62));
}

.page-about .value-list {
  display: grid;
  gap: 1px;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .value-item {
  padding: clamp(20px, 3vw, 30px);
  background: var(--board);
}

.page-about .value-item:nth-child(2n) {
  background: var(--ink);
}

.page-about .value-kicker {
  display: block;
  margin-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .value-item h3 {
  margin: 0 0 10px;
  font-size: clamp(1.04rem, 1.9vw, 1.3rem);
  font-weight: 500;
  color: var(--paper);
}

.page-about .value-item p {
  margin: 0;
  font-size: 14.2px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(46px, 7vw, 84px) 0 clamp(56px, 8vw, 96px);
}

.page-about .cta-inner {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-l);
  background:
    linear-gradient(118deg, rgba(47, 242, 200, 0.11), rgba(8, 13, 36, 0.55) 46%, rgba(255, 106, 43, 0.13));
}

.page-about .cta-inner::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 242, 200, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .cta-inner h2 {
  position: relative;
  margin: 0;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .cta-inner p {
  position: relative;
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .cta-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .stat-bar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-split {
    grid-template-columns: minmax(0, 1fr) 190px;
    align-items: end;
  }

  .page-about .season-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .tl-item {
    padding: 26px 0 26px 210px;
  }

  .page-about .tl-item::before {
    position: absolute;
    left: 0;
    top: 32px;
    width: 170px;
    margin: 0;
  }

  .page-about .tl-item:nth-child(even) {
    padding: 26px 210px 26px 0;
  }

  .page-about .tl-item:nth-child(even)::before {
    left: auto;
    right: 0;
    text-align: right;
  }

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

  .page-about .version-note {
    grid-column: 1 / -1;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .process-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .process-figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-mark,
  .page-about .about-index a,
  .page-about .sport-card {
    transition: none;
  }

  .page-about .process-figure {
    position: static;
  }
}