.page-about {
  --about-dot: 12px;
  --about-sec-gap: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(28px, 4vw, 46px);
}

.page-about .about-hero__label {
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
  margin: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5.2vw, 62px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--warm-50);
  margin: 16px 0 0;
  max-width: 17em;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--gray-400);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-500);
  border: 2px solid var(--ink-500);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-fact {
  background: var(--ink-850);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__key {
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
  color: var(--gray-400);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  margin-top: var(--about-sec-gap);
  padding-top: clamp(30px, 4.6vw, 56px);
  border-top: 1px solid var(--ink-500);
}

.page-about .about-sec__head {
  max-width: 42em;
}

.page-about .about-sec__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.005em;
  color: var(--warm-50);
  margin: 12px 0 0;
}

.page-about .about-sec__lead {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--gray-400);
}

.page-about .about-sec__note {
  margin: 26px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-400);
  padding-left: 16px;
  border-left: 3px solid var(--cyan-400);
}

/* ---------- 图片框 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-cover__figure {
  margin: 28px 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0 0 0 32px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--ink-500);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 40px);
}

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

.page-about .timeline__dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: var(--about-dot);
  height: var(--about-dot);
  background: var(--cyan-400);
  box-sizing: border-box;
  border: 2px solid var(--ink-950);
}

.page-about .timeline__item--done .timeline__dot {
  background: var(--orange-500);
}

.page-about .timeline__item--current .timeline__dot {
  background: var(--cyan-400);
  box-shadow: 0 0 0 5px rgba(51, 225, 242, 0.16);
}

.page-about .timeline__phase {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gray-400);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__item--current .timeline__phase {
  color: var(--cyan-400);
}

.page-about .timeline__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-h3);
  line-height: 1.2;
  color: var(--warm-50);
  margin: 8px 0 0;
}

.page-about .timeline__text {
  margin: 10px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-400);
}

/* ---------- 版本日志 ---------- */
.page-about .log-intro {
  margin-top: clamp(24px, 3.4vw, 38px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .log-intro__text {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--gray-400);
}

.page-about .log-intro__figure {
  margin: 0;
}

.page-about .filter-bar {
  margin: clamp(26px, 3.4vw, 38px) 0 0;
  flex-wrap: wrap;
}

.page-about .log-list {
  margin-top: 20px;
}

.page-about .log-item {
  background: var(--ink-850);
  border: 2px solid var(--ink-500);
  box-shadow: var(--shadow-hard-sm);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}

.page-about .log-item:last-child {
  margin-bottom: 0;
}

.page-about .log-item__head {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 18px 18px 46px;
  cursor: pointer;
  list-style: none;
}

.page-about .log-item__head::-webkit-details-marker {
  display: none;
}

.page-about .log-item__head::before {
  content: "+";
  position: absolute;
  left: 16px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .log-item[open] .log-item__head::before {
  content: "\2212";
}

.page-about .log-item__ver {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
  font-variant-numeric: tabular-nums;
}

.page-about .log-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .log-item__sum {
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--warm-50);
}

.page-about .log-item__body {
  border-top: 1px solid var(--ink-500);
  padding: 18px 18px 22px 46px;
}

.page-about .log-item__body ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .log-item__body li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-400);
}

.page-about .log-item__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background: var(--orange-500);
}

/* ---------- 覆盖数据 ---------- */
.page-about .stat-grid {
  list-style: none;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-500);
  border: 2px solid var(--ink-500);
  box-shadow: var(--shadow-hard);
}

.page-about .stat-grid__cell {
  background: var(--ink-700);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  min-width: 0;
}

.page-about .stat-grid__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.page-about .stat-grid__num em {
  font-style: normal;
  font-size: 0.5em;
  color: var(--orange-200);
  margin-left: 2px;
}

.page-about .stat-grid__key {
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--gray-400);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  margin-top: clamp(24px, 3.4vw, 38px);
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .team-split__text {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--gray-400);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink-500);
}

.page-about .team-list__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ink-500);
}

.page-about .team-list__key {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .team-list__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--warm-50);
}

/* ---------- 里程碑 ---------- */
.page-about .mile-wrap {
  margin-top: clamp(24px, 3.4vw, 38px);
  overflow-x: auto;
  border: 2px solid var(--ink-500);
  box-shadow: var(--shadow-hard-sm);
  background: var(--ink-850);
}

.page-about .mile-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .mile-table th,
.page-about .mile-table td {
  text-align: left;
  padding: 16px 18px;
  border-bottom: 1px solid var(--ink-500);
  line-height: 1.7;
  vertical-align: top;
}

.page-about .mile-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--ink-700);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-200);
}

.page-about .mile-table tbody th {
  width: 34%;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 16px;
  color: var(--warm-50);
  background: var(--ink-850);
}

.page-about .mile-table tbody td {
  color: var(--gray-400);
}

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

.page-about .mile-table tbody tr:hover th,
.page-about .mile-table tbody tr:hover td {
  background: var(--ink-700);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: var(--about-sec-gap);
  border: 2px solid var(--ink-500);
  background:
    linear-gradient(135deg, rgba(51, 225, 242, 0.12) 0%, rgba(6, 11, 22, 0) 46%),
    linear-gradient(315deg, rgba(255, 122, 26, 0.14) 0%, rgba(6, 11, 22, 0) 52%),
    var(--ink-850);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__inner {
  padding: clamp(26px, 4.4vw, 52px);
}

.page-about .about-cta__label {
  margin: 0;
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .about-cta__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.06;
  color: var(--warm-50);
  margin: 12px 0 0;
  max-width: 16em;
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--gray-400);
}

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

.page-about .about-cta__actions .btn {
  flex: 0 0 auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .log-item__head {
    flex-direction: row;
    align-items: center;
    gap: 22px;
    padding: 20px 22px 20px 52px;
  }

  .page-about .log-item__head::before {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
  }

  .page-about .log-item__ver {
    flex: 0 0 auto;
  }

  .page-about .log-item__tags {
    flex: 0 0 auto;
  }

  .page-about .log-item__sum {
    flex: 1 1 auto;
  }

  .page-about .log-item__body {
    padding: 18px 22px 24px 52px;
  }
}

@media (min-width: 900px) {
  .page-about .log-intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .team-list {
    border-top: 2px solid var(--ink-500);
  }

  .page-about .timeline {
    padding-left: 44px;
  }

  .page-about .timeline::before {
    left: 5px;
  }

  .page-about .timeline__dot {
    left: -44px;
  }

  .page-about .timeline__item {
    padding-bottom: 44px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 56px;
  }

  .page-about .timeline__content {
    display: grid;
    grid-template-columns: minmax(0, 14em) minmax(0, 1fr);
    gap: 4px 32px;
    align-items: start;
  }

  .page-about .timeline__phase {
    grid-column: 1;
    padding-top: 4px;
  }

  .page-about .timeline__title {
    grid-column: 2;
    margin-top: 0;
  }

  .page-about .timeline__text {
    grid-column: 2;
    margin-top: 8px;
  }
}
<<<END>>>