.page-about {
  --rail-w: 104px;
  --about-gap: clamp(20px, 4vw, 36px);
  color: var(--text);
  padding-bottom: clamp(40px, 7vw, 84px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(28px, 5vw, 52px);
  padding-bottom: clamp(36px, 6vw, 68px);
  border-bottom: 2px solid var(--line);
}

.page-about .hero-ghost {
  position: absolute;
  top: -0.2em;
  right: -0.06em;
  z-index: 0;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(72px, 20vw, 240px);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 1px rgba(30, 58, 95, 0.95);
  opacity: 0.6;
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero > *:not(.hero-ghost) {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.4vw, 66px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.78;
  color: var(--text);
}

.page-about .hero-note {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 5vw, 44px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .about-stat {
  min-width: 0;
  padding: 16px 16px 18px;
  background: var(--ink-2);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stat__unit {
  margin-left: 3px;
  font-size: 0.52em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-journey {
  padding-top: clamp(36px, 6vw, 76px);
}

.page-about .journey-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .section-title {
  margin: 8px 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.5vw, 36px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.018em;
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

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

.page-about .year-rail a {
  display: block;
  padding: 9px 14px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease,
    background-color 0.2s ease, color 0.2s ease;
}

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

.page-about .year-rail a[aria-current="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .journey-banner {
  margin: clamp(22px, 4vw, 34px) 0 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .journey-banner img,
.page-about .sources-figure img,
.page-about .credits-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--orange) 0%,
    var(--cyan) 52%,
    var(--acid) 100%
  );
}

.page-about .timeline-item {
  position: relative;
  padding: clamp(18px, 3vw, 26px) clamp(18px, 3vw, 28px);
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.page-about .timeline-item:nth-child(even) {
  background: var(--ink-3);
}

.page-about .timeline-item:hover,
.page-about .timeline-item:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 26px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border: 3px solid var(--orange);
  border-radius: 50%;
  background: var(--ink);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .timeline-item:nth-child(2)::before {
  border-color: var(--cyan);
}

.page-about .timeline-item:nth-child(3)::before {
  border-color: var(--acid);
}

.page-about .timeline-item:hover::before,
.page-about .timeline-item:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline-tag {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--acid);
}

.page-about .timeline-tag .num {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--orange);
}

.page-about .timeline-item h3 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.5vw, 26px);
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.01em;
}

.page-about .timeline-item p {
  margin: 12px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .timeline-item .timeline-fact {
  margin-top: 16px;
  padding: 12px 14px;
  border-left: 3px solid var(--acid);
  background: rgba(198, 242, 78, 0.07);
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  margin-top: clamp(52px, 8vw, 100px);
  padding: clamp(38px, 6vw, 72px) 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: linear-gradient(
      180deg,
      rgba(22, 213, 200, 0.06) 0%,
      rgba(22, 213, 200, 0) 62%
    ),
    var(--ink-3);
}

.page-about .sources-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .sources-copy > p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .source-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .source-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--cyan);
  background: var(--ink-2);
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .source-list li:nth-child(2) {
  border-left-color: var(--acid);
}

.page-about .source-list li:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .source-list .num {
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .sources-figure {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
}

/* ---------- 三条产品线 ---------- */
.page-about .about-lines {
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(24px, 8vw, 104px);
}

.page-about .line-list {
  display: grid;
  gap: 18px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .line-item {
  --dy: 0px;
  position: relative;
  min-width: 0;
  padding: 26px 22px 28px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-soft);
  transform: translateY(var(--dy));
  transition: transform 0.2s ease, border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.page-about .line-item::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: -2px;
  height: 4px;
  background: var(--cyan);
  transform: scaleX(0.26);
  transform-origin: left center;
  transition: transform 0.26s ease;
}

.page-about .line-item:nth-child(2)::after {
  background: var(--acid);
}

.page-about .line-item:nth-child(3)::after {
  background: var(--orange);
}

.page-about .line-item:hover,
.page-about .line-item:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow);
  transform: translateY(calc(var(--dy) - 2px));
}

.page-about .line-item:hover::after,
.page-about .line-item:focus-within::after {
  transform: scaleX(1);
}

.page-about .line-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .line-item h3 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.36;
}

.page-about .line-item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .line-link {
  display: inline-block;
  margin-top: 16px;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .line-link:hover {
  color: var(--acid);
  border-bottom-color: var(--acid);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 2px solid var(--line);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .team-copy > p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .team-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .team-fact {
  min-width: 0;
  padding: 18px 16px;
  background: var(--ink-2);
}

.page-about .team-fact__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--cyan);
}

.page-about .team-fact__unit {
  margin-left: 3px;
  font-size: 0.5em;
  color: var(--muted);
}

.page-about .team-fact__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 资质与合作 ---------- */
.page-about .about-credits {
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 2px solid var(--line);
  background: var(--abyss);
}

.page-about .credits-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .credits-figure {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .credits-copy > p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .seal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .seal {
  min-width: 0;
  padding: 18px 16px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

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

.page-about .seal__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--line);
  color: var(--acid);
}

.page-about .seal__name {
  display: block;
  margin-top: 12px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .seal__desc {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 下一赛季 ---------- */
.page-about .about-season {
  padding-top: clamp(44px, 7vw, 84px);
}

.page-about .season-lede {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .season-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .season-item {
  min-width: 0;
  padding: 22px 18px 24px;
  background: var(--ink-2);
}

.page-about .season-item__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--acid);
}

.page-about .season-item h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.36;
}

.page-about .season-item p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .season-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(26px, 4vw, 40px);
  padding: 24px 22px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--orange);
  background: var(--ink-2);
}

.page-about .season-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .season-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .season-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .sources-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .credits-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .line-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .line-item:nth-child(2) {
    --dy: 30px;
  }

  .page-about .line-item:nth-child(3) {
    --dy: 60px;
  }
}

@media (min-width: 900px) {
  .page-about .journey-grid {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .year-rail {
    position: sticky;
    top: 130px;
    align-self: start;
  }

  .page-about .year-rail ul {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-about .year-rail a {
    text-align: center;
    letter-spacing: 0.08em;
  }

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

@media (min-width: 1040px) {
  .page-about .seal-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 420px) {
  .page-about .seal-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-stat {
    padding: 14px 12px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-rail a,
  .page-about .timeline-item,
  .page-about .timeline-item::before,
  .page-about .line-item,
  .page-about .line-item::after,
  .page-about .line-link,
  .page-about .seal {
    transition: none;
  }

  .page-about .year-rail a:hover,
  .page-about .timeline-item:hover,
  .page-about .timeline-item:focus-within,
  .page-about .line-item:hover,
  .page-about .line-item:focus-within,
  .page-about .seal:hover {
    transform: translateY(var(--dy, 0px));
  }
}
<<<END>>>