.page-about {
  --about-pad: clamp(46px, 6.5vw, 92px);
  --about-gap: clamp(20px, 3vw, 38px);
  --about-hair: rgba(199, 210, 224, 0.16);
  --about-hair-soft: rgba(199, 210, 224, 0.08);
  --about-text-soft: rgba(199, 210, 224, 0.84);
  background: var(--c-deep);
  color: var(--c-mist);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about .about-kicker {
  font-family: var(--font-head);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 var(--about-pad);
  background:
    radial-gradient(760px 380px at 88% -8%, rgba(255, 107, 26, 0.22), transparent 68%),
    radial-gradient(640px 340px at 2% 108%, rgba(31, 163, 122, 0.16), transparent 70%),
    linear-gradient(168deg, var(--c-deep) 0%, var(--c-navy) 58%, var(--c-navy-2) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% auto -20%;
  height: 128%;
  background-image:
    linear-gradient(to right, var(--about-hair-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-hair-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 88%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 340px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .about-kicker::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 107, 26, 0.55), transparent);
}

.page-about .about-kicker--hero {
  color: var(--c-orange-soft);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 5.6vw, 56px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: #fff;
  max-width: 16ch;
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.9;
  color: var(--about-text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__stats div {
  min-width: 0;
}

.page-about .about-hero__stats dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-silver);
  opacity: 0.72;
}

.page-about .about-hero__stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1;
  color: var(--c-orange-soft);
}

.page-about .about-hero__stats .num {
  font-family: var(--font-mono);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  padding: 16px 16px 8px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-1);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 8px;
  border-radius: 8px;
  border-bottom: 1px solid var(--about-hair-soft);
  font-size: 14px;
  color: var(--c-silver);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease;
}

.page-about .about-index__list li:last-child .about-index__link {
  border-bottom: 0;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: #fff;
  background: rgba(127, 211, 232, 0.08);
}

.page-about .about-index__link[data-active="true"] {
  color: var(--c-orange-soft);
  background: rgba(255, 107, 26, 0.1);
}

.page-about .about-index__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-orange);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-section__head {
  max-width: 780px;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-section__head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-section__lede {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--about-text-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--glass-2);
}

.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-figure .media-frame__caption {
  padding: 10px 16px 12px;
  border-top: 1px solid var(--about-hair);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-silver);
}

/* ---------- 时间轴 ---------- */
.page-about .about-section--timeline {
  background: var(--c-navy);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  display: grid;
  gap: 0;
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 22px 0 24px 28px;
  border-left: 1px solid var(--about-hair);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 28px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-navy);
  border: 2px solid var(--c-orange);
  box-sizing: content-box;
}

.page-about .timeline__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .timeline__year .num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-orange);
}

.page-about .timeline__stage {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-silver);
  opacity: 0.72;
}

.page-about .timeline__body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.42;
  color: #fff;
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-text-soft);
}

/* ---------- 版本对照（雾白区） ---------- */
.page-about .about-section--versions {
  background: var(--c-mist);
  color: var(--c-ink);
}

.page-about .about-section--versions .about-kicker {
  color: #d1540f;
}

.page-about .about-section--versions .about-section__head h2 {
  color: var(--c-ink);
}

.page-about .about-section--versions .about-section__lede {
  color: #3f4f66;
}

.page-about .versions-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-diff {
  border: 1px solid rgba(11, 27, 51, 0.12);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(11, 27, 51, 0.1);
}

.page-about .diff-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .diff-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .diff-table caption {
  padding: 16px 18px 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: #64758c;
}

.page-about .diff-table th,
.page-about .diff-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
}

.page-about .diff-table thead th {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #64758c;
  border-bottom: 1px solid rgba(11, 27, 51, 0.16);
  white-space: nowrap;
}

.page-about .diff-table tbody th {
  font-weight: 600;
  color: var(--c-ink);
  border-bottom: 1px solid rgba(11, 27, 51, 0.09);
  white-space: nowrap;
}

.page-about .diff-table tbody td {
  color: #4a5b72;
  border-bottom: 1px solid rgba(11, 27, 51, 0.09);
}

.page-about .diff-table tbody tr:last-child th,
.page-about .diff-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .diff-table tbody tr:nth-child(odd) {
  background: rgba(244, 247, 251, 0.7);
}

.page-about .diff-table td:last-child {
  white-space: nowrap;
}

.page-about .about-section--versions .tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

.page-about .about-section--versions .tag--orange {
  background: rgba(255, 107, 26, 0.14);
  color: #b2460a;
}

.page-about .about-section--versions .tag--green {
  background: rgba(31, 163, 122, 0.14);
  color: #14724f;
}

.page-about .version-side h3 {
  margin: 0 0 16px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .version-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: vs;
}

.page-about .version-steps li {
  position: relative;
  padding: 14px 16px 14px 50px;
  border: 1px solid rgba(11, 27, 51, 0.12);
  border-radius: var(--radius-sm);
  background: #fff;
  font-size: 14px;
  line-height: 1.75;
  color: #26364c;
}

.page-about .version-steps li::before {
  counter-increment: vs;
  content: counter(vs, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #d1540f;
}

.page-about .version-note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid rgba(127, 211, 232, 0.6);
  font-size: 13.5px;
  line-height: 1.8;
  color: #4a5b72;
}

/* ---------- 数据团队 ---------- */
.page-about .about-section--team {
  background: linear-gradient(180deg, var(--c-navy) 0%, var(--c-navy-2) 100%);
}

.page-about .team-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .team-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-flow li {
  padding: 16px 18px;
  border-left: 2px solid var(--c-green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(31, 163, 122, 0.09);
}

.page-about .team-flow .num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-green-soft);
}

.page-about .team-flow strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.page-about .team-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-section--partners {
  background: var(--c-deep);
}

.page-about .partner-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-figure--partners {
  margin-bottom: 0;
}

.page-about .about-figure--partners .media-frame__img {
  aspect-ratio: 12 / 7;
}

.page-about .partner-cards {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.page-about .partner-card {
  padding: 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--glass-2);
}

.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-orange-soft);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

/* ---------- 会员社区 ---------- */
.page-about .about-section--community {
  background: var(--c-navy-2);
}

.page-about .community-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.page-about .community-card {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  border-top: 2px solid var(--c-cyan);
  border-radius: var(--radius-sm) var(--radius-sm) var(--radius) var(--radius);
  background: rgba(11, 27, 51, 0.55);
}

.page-about .community-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.page-about .community-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

/* ---------- 里程碑 ---------- */
.page-about .about-section--milestones {
  background: var(--c-navy);
}

.page-about .milestones {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .milestones li {
  display: grid;
  gap: 4px;
  padding-top: 14px;
  border-top: 2px solid var(--c-orange);
}

.page-about .milestones__v {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}

.page-about .milestones strong {
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
}

.page-about .milestones__y {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-silver);
  opacity: 0.72;
}

.page-about .milestones__next {
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  max-width: 72ch;
  padding: 18px 20px;
  border: 1px dashed var(--line-cyan);
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-text-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-section--close {
  background: linear-gradient(118deg, var(--c-orange) 0%, #ff8a46 46%, var(--c-orange-soft) 100%);
  color: var(--c-deep);
}

.page-about .about-close__inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-close__inner h2 {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.25;
  color: var(--c-deep);
}

.page-about .about-close__text {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(6, 16, 31, 0.82);
}

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

.page-about .close-link {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid rgba(6, 16, 31, 0.45);
  background: var(--c-deep);
  color: #fff;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease;
}

.page-about .close-link:hover,
.page-about .close-link:focus-visible {
  background: #0d2038;
  transform: translateY(-2px);
}

.page-about .close-link--ghost {
  background: rgba(255, 255, 255, 0.2);
  color: var(--c-deep);
  border-color: rgba(6, 16, 31, 0.3);
}

.page-about .close-link--ghost:hover,
.page-about .close-link--ghost:focus-visible {
  background: rgba(255, 255, 255, 0.36);
}

.page-about a:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .milestones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .timeline__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    padding-left: 34px;
    align-items: start;
  }

  .page-about .timeline__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .timeline__item::before {
    left: -6px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    gap: clamp(32px, 4.5vw, 64px);
  }

  .page-about .versions-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

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

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

  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }
}

@media (min-width: 1180px) {
  .page-about .milestones {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-about .about-hero__stats {
    gap: 10px;
  }

  .page-about .about-hero__stats dt {
    font-size: 11px;
    letter-spacing: 0.08em;
  }

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

  .page-about .diff-table {
    min-width: 480px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>