.page-about {
  --ab-axis: 200px;
  --ab-gap: clamp(20px, 3.5vw, 48px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding: clamp(14px, 2.4vw, 24px) 0 0;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.12em;
  color: var(--mute);
}

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

.page-about .breadcrumb-link {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold);
}

.page-about .breadcrumb-current {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 6vw, 84px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: 45%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-deep));
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 7vw, 82px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title span {
  font-family: var(--font-body);
  font-weight: 700;
  color: var(--gold-hi);
  letter-spacing: -0.03em;
}

.page-about .about-hero__lede {
  max-width: 40em;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-gold);
  background: var(--felt);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: rgba(8, 19, 14, 0.86);
  border-top: 1px solid var(--line-gold);
  border-right: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.14em;
  color: var(--gold-hi);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: var(--felt);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index ol {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px clamp(14px, 2.4vw, 26px);
  border-right: 1px solid var(--line-soft);
  text-decoration: none;
  white-space: nowrap;
  color: var(--mute);
  transition: color 180ms ease, background-color 180ms ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--gold-hi);
  background: var(--lift);
}

.page-about .ix-num {
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .ix-label {
  font-size: var(--step-small);
  letter-spacing: 0.06em;
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  padding: clamp(44px, 7vw, 96px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-block--felt {
  background:
    linear-gradient(180deg, rgba(16, 37, 27, 0.96), rgba(8, 19, 14, 0.96));
}

.page-about .about-head {
  margin-bottom: clamp(28px, 4vw, 52px);
  max-width: 52em;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-node {
  position: relative;
  display: grid;
  gap: 14px;
  padding-left: 30px;
  padding-bottom: clamp(26px, 3.6vw, 46px);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(216, 168, 78, 0.16);
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-gold), var(--line-soft));
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-node:last-child::after {
  display: none;
}

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

.page-about .tl-year__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 58px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--gold-hi);
}

.page-about .tl-year__tag {
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.16em;
  padding: 3px 8px;
  border: 1px solid var(--line-soft);
  color: var(--mute);
}

.page-about .tl-year__tag--version {
  border-color: var(--line-gold);
  color: var(--gold-hi);
}

.page-about .tl-year__tag--feature {
  border-color: rgba(138, 51, 66, 0.7);
  color: #D98A96;
}

.page-about .tl-year__tag--content {
  border-color: rgba(93, 107, 103, 0.7);
  color: var(--paper);
}

.page-about .tl-card {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--felt);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .tl-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  background: linear-gradient(225deg, var(--ink) 50%, transparent 50%);
  border-left: 1px solid var(--line-soft);
  pointer-events: none;
}

.page-about .tl-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h3);
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .tl-card p {
  margin: 0;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .tl-more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .tl-more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.14em;
  color: var(--gold);
}

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

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

.page-about .tl-more[open] summary::before {
  content: "– ";
}

.page-about .tl-more summary:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 3px;
}

.page-about .tl-more p {
  margin-top: 10px;
  font-size: var(--step-small);
  line-height: 1.8;
}

/* ---------- 段位 ---------- */
.page-about .ranks-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .ranks-copy p {
  margin: 0 0 14px;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .ranks-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: var(--step-small);
  letter-spacing: 0.1em;
  color: var(--gold-hi);
}

.page-about .ranks-figure {
  margin: 0;
  border: 1px solid var(--line-gold);
  background: var(--ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .ranks-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ranks-figure figcaption,
.page-about .replay-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.1em;
  color: var(--mute);
}

.page-about .rank-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(158px, 1fr);
  gap: 14px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 4px 4px 18px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .rank-track:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 4px;
}

.page-about .rank-chip {
  position: relative;
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  background: var(--lift);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-hard-sm);
  color: var(--stone);
}

.page-about .rank-chip:nth-child(1) { color: var(--stone); }
.page-about .rank-chip:nth-child(2) { color: #8FA396; }
.page-about .rank-chip:nth-child(3) { color: var(--paper); }
.page-about .rank-chip:nth-child(4) { color: var(--gold); }
.page-about .rank-chip:nth-child(5) { color: var(--gold-hi); }
.page-about .rank-chip:nth-child(6) { color: #D98A96; }

.page-about .rank-badge {
  display: block;
  width: 54px;
  height: auto;
  margin-bottom: 12px;
}

.page-about .rank-chip__index {
  display: block;
  font-size: var(--step-micro);
  letter-spacing: 0.2em;
  color: var(--mute);
}

.page-about .rank-chip__name {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h3);
  color: var(--paper);
}

.page-about .rank-chip p {
  margin: 0;
  font-size: var(--step-small);
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 浏览器三阶段 ---------- */
.page-about .stages {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage {
  position: relative;
  padding: 22px 20px 26px;
  background: linear-gradient(180deg, rgba(26, 54, 40, 0.92), rgba(16, 37, 27, 0.92));
  border-top: 3px solid var(--gold);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stage__num {
  display: block;
  font-size: var(--step-micro);
  letter-spacing: 0.24em;
  color: var(--gold);
}

.page-about .stage__title {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h3);
  color: var(--paper);
}

.page-about .stage p {
  margin: 0;
  font-size: var(--step-small);
  line-height: 1.85;
  color: var(--mute);
}

/* ---------- 回放 ---------- */
.page-about .replay-grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}

.page-about .replay-figure {
  margin: 0;
  border: 1px solid var(--line-gold);
  background: var(--ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .replay-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 30 / 19;
  object-fit: cover;
}

.page-about .replay-copy h2 {
  margin: 10px 0 16px;
}

.page-about .replay-copy p {
  margin: 0 0 16px;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .replay-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 团队 ---------- */
.page-about .crew {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .crew li {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .crew__no {
  font-size: var(--step-micro);
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .crew__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h3);
  color: var(--paper);
}

.page-about .crew__desc {
  font-size: var(--step-small);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .stats {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: -0.02em;
  color: var(--gold-hi);
}

.page-about .stat-label {
  font-size: var(--step-small);
  color: var(--mute);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  padding: clamp(48px, 8vw, 110px) 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(216, 168, 78, 0.16), transparent 58%),
    var(--ink);
}

.page-about .about-outro__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.4vw, 54px);
  line-height: 1.15;
  color: var(--paper);
}

.page-about .about-outro__text {
  max-width: 42em;
  margin: 18px 0 0;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--mute);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 7 / 6;
  }

  .page-about .stages {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }

  .page-about .stage:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .stage:nth-child(3) {
    margin-top: 64px;
  }

  .page-about .crew li {
    grid-template-columns: 52px 170px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 22px;
  }

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

@media (min-width: 900px) {
  .page-about .ranks-grid {
    grid-template-columns: 0.95fr 1.05fr;
  }

  .page-about .replay-grid {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .replay-figure {
    margin-top: -28px;
  }

  .page-about .tl-node {
    grid-template-columns: var(--ab-axis) minmax(0, 1fr);
    column-gap: var(--ab-gap);
    padding-left: 0;
    padding-bottom: clamp(32px, 4vw, 56px);
  }

  .page-about .tl-node::before {
    left: calc(var(--ab-axis) - 9px);
    top: 22px;
  }

  .page-about .tl-node::after {
    left: calc(var(--ab-axis) - 5px);
    top: 40px;
  }

  .page-about .tl-year {
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    text-align: right;
    padding-right: 22px;
  }

  .page-about .tl-year__num {
    font-size: clamp(46px, 4.6vw, 64px);
  }

  .page-about .tl-card {
    margin-right: clamp(0px, 2vw, 28px);
  }

  .page-about .tl-node:nth-child(even) .tl-card {
    margin-right: 0;
    margin-left: clamp(0px, 2vw, 28px);
  }
}

@media (min-width: 1180px) {
  .page-about .rank-track {
    grid-auto-columns: 1fr;
    overflow-x: visible;
  }

  .page-about .about-hero__figure {
    margin-top: -18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a {
    transition: color 120ms linear;
  }
}
<<<END>>>