.page-about {
  --about-rail-x: clamp(14px, 2.2vw, 34px);
  --about-rail-w: 60px;
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(92px, 13vw, 150px) var(--gutter) clamp(56px, 8vw, 104px);
  color: var(--text);
}

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

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-top: clamp(8px, 2vw, 24px);
  padding-bottom: clamp(40px, 6vw, 78px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-copy {
  min-width: 0;
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 80px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
  max-width: 15em;
  background: linear-gradient(96deg, var(--text) 32%, var(--gold-hi) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .lede {
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-hero-plate {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px 22px;
  box-shadow:
    6px 6px 0 -1px rgba(30, 33, 38, 0.9),
    12px 12px 0 -2px rgba(20, 22, 26, 0.9),
    18px 18px 0 -3px rgba(124, 74, 18, 0.35);
}

.page-about .about-plate-list {
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-plate-list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-plate-list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-plate-list dt {
  color: var(--muted);
  font-size: 13.5px;
  letter-spacing: 0.02em;
}

.page-about .about-plate-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold-hi);
  letter-spacing: 0.02em;
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-top: clamp(48px, 7.5vw, 102px);
  padding-bottom: clamp(40px, 6.5vw, 86px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 3.3vw, 43px);
  line-height: 1.22;
  letter-spacing: -0.012em;
  margin: 0 0 18px;
}

.page-about .about-intro {
  max-width: 68ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.85;
}

/* ---------- 时间轴 ---------- */

.page-about .about-banner {
  margin: 0 0 clamp(28px, 4vw, 48px);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-track {
  list-style: none;
  position: relative;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1.5px;
  background: linear-gradient(
    180deg,
    var(--gold-deep) 0%,
    var(--gold) 20%,
    var(--gold) 76%,
    rgba(227, 155, 60, 0.06) 100%
  );
}

.page-about .about-node {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px) 40px;
  transition: transform 0.2s var(--ease);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  background: var(--gold);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .about-node:hover::before,
.page-about .about-node:focus::before {
  background: var(--gold-hi);
}

.page-about .about-node:hover,
.page-about .about-node:focus {
  transform: translateX(3px);
  outline: none;
}

.page-about .about-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 7px;
}

.page-about .about-node-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18.5px, 2.1vw, 24px);
  line-height: 1.35;
  margin: 0 0 8px;
}

.page-about .about-node-body p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.82;
}

/* ---------- 维护团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: minmax(48px, auto) minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  background: var(--ink-2);
  padding: 16px 18px;
}

.page-about .about-role-key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-hi);
  white-space: nowrap;
}

.page-about .about-role-body h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
}

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

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

/* ---------- 校订流程 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .about-step {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px 24px;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20px;
  width: 34px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-step:hover {
  transform: translateY(-3px);
  border-color: var(--gold);
}

.page-about .about-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .about-step h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}

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

/* ---------- 覆盖范围与分段切换 ---------- */

.page-about .about-tabs {
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-tab {
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.02em;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-tab:hover {
  color: var(--text);
  border-color: var(--gold);
}

.page-about .about-tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .about-panel {
  margin-top: 14px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .about-panel h3 {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  margin: 0 0 10px;
}

.page-about .about-panel p {
  margin: 0 0 10px;
  max-width: 66ch;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-panel-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  color: var(--text);
  font-size: 14px;
}

/* ---------- 规模数字 ---------- */

.page-about .about-scale {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
}

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

.page-about .about-stats {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-stat {
  padding-left: 16px;
  border-left: 2px solid var(--line);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--gold);
}

.page-about .about-stat-num {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(29px, 4.2vw, 45px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--gold-hi);
}

.page-about .about-stat-label {
  margin: 0 0 4px;
  font-size: 15px;
  color: var(--text);
}

.page-about .about-stat-note {
  margin: 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 反馈与下一步 ---------- */

.page-about .about-feedback {
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(227, 155, 60, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink-2), var(--ink));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 4.6vw, 56px);
  margin-top: clamp(48px, 7.5vw, 96px);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-links {
  margin: 20px 0 0;
  max-width: 70ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}

.page-about .about-links a {
  color: var(--gold-hi);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 显现动效 ---------- */

.page-about [data-reveal].will-reveal {
  opacity: 0;
  transform: translateY(8px);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-roles li {
    padding: 18px 22px;
  }
}

@media (min-width: 660px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) minmax(238px, 296px);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }

  .page-about .about-scale {
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-team-figure {
    position: sticky;
    top: clamp(88px, 12vh, 140px);
  }
}

@media (min-width: 820px) {
  .page-about .about-node {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: 44px;
    padding-left: 0;
    padding-bottom: clamp(38px, 4.4vw, 58px);
  }

  .page-about .about-track::before {
    left: 109px;
  }

  .page-about .about-node::before {
    left: 102px;
    top: 3px;
  }

  .page-about .about-year {
    text-align: right;
    margin-bottom: 0;
  }

  .page-about .about-node:hover,
  .page-about .about-node:focus {
    transform: translateX(4px);
  }
}

@media (min-width: 1040px) {
  .page-about {
    padding-left: calc(var(--gutter) + var(--about-rail-w));
  }

  .page-about .about-rail {
    display: flex;
    flex-direction: column;
    gap: 22px;
    position: fixed;
    left: var(--about-rail-x);
    top: 50%;
    transform: translateY(-50%);
    z-index: 4;
    pointer-events: none;
  }

  .page-about .about-rail-item {
    display: flex;
    align-items: center;
    gap: 9px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--muted);
    transition: color 0.2s var(--ease);
  }

  .page-about .about-rail-item[aria-current="true"] {
    color: var(--gold-hi);
  }

  .page-about .about-rail-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--line);
    transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
  }

  .page-about .about-rail-item[aria-current="true"] .about-rail-dot {
    background: var(--gold);
    box-shadow: 0 0 0 4px rgba(227, 155, 60, 0.16);
  }

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

  .page-about .about-step:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .about-step:nth-child(3) {
    margin-top: 40px;
  }

  .page-about .about-step:nth-child(4) {
    margin-top: 60px;
  }

  .page-about .about-flow {
    padding-bottom: clamp(86px, 10vw, 150px);
  }
}

@media (max-width: 480px) {
  .page-about .about-hero-plate {
    box-shadow:
      4px 4px 0 -1px rgba(30, 33, 38, 0.9),
      8px 8px 0 -2px rgba(124, 74, 18, 0.32);
  }

  .page-about .about-roles li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-step,
  .page-about .about-stat,
  .page-about .about-tab,
  .page-about [data-reveal].will-reveal,
  .page-about [data-reveal].is-visible {
    transition: none;
    transform: none;
    opacity: 1;
  }
}
<<<END>>>