.page-about {
  --about-gap: clamp(14px, 2.4vw, 24px);
  --about-radius: 2px;
  display: block;
  padding-bottom: clamp(48px, 7vw, 88px);
}

/* ---------- 面包屑下方留白 ---------- */
.page-about .breadcrumbs {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .page-about__hero {
  display: grid;
  gap: var(--about-gap);
  padding: 22px 0 clamp(28px, 4vw, 46px);
  border-bottom: 2px dashed var(--line);
}

.page-about .page-about__hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(32px, 7.2vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .page-about__hero-copy .lede {
  margin-top: 16px;
  max-width: 46ch;
}

.page-about .page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .page-about__hero-media {
  margin: 0;
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  background: var(--steel);
}

.page-about .page-about__hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

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

.page-about .page-about__stat {
  background: linear-gradient(180deg, rgba(28, 50, 71, 0.96), rgba(11, 27, 43, 0.96));
  padding: 16px 14px;
}

.page-about .page-about__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 5vw, 36px);
  line-height: 1;
  color: var(--amber);
}

.page-about .page-about__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.45;
  color: rgba(232, 238, 243, 0.72);
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding-top: clamp(38px, 6vw, 72px);
}

.page-about .section h2 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.22;
  color: var(--paper);
}

.page-about .page-about__section-lede {
  margin-top: 14px;
  max-width: 60ch;
}

.page-about .prose p {
  margin: 0 0 14px;
  line-height: 1.78;
  color: rgba(232, 238, 243, 0.84);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .page-about__linkline {
  margin-top: 22px;
  padding: 14px 16px;
  border-left: 3px solid var(--lake);
  background: rgba(47, 167, 160, 0.08);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(232, 238, 243, 0.86);
}

.page-about .page-about__linkline a {
  color: var(--lake);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 起点 ---------- */
.page-about .page-about__origin-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .page-about__origin-note {
  border: 2px solid var(--line-strong);
  background: linear-gradient(155deg, rgba(28, 50, 71, 0.95), rgba(6, 17, 28, 0.95));
  box-shadow: var(--shadow-hard);
  padding: 20px 18px;
  align-self: start;
}

.page-about .page-about__origin-note-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lake);
}

.page-about .page-about__origin-steps {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .page-about__origin-steps li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(232, 238, 243, 0.86);
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .page-about__origin-steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .page-about__origin-steps .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--amber);
  flex: none;
}

/* ---------- 三条内容线 ---------- */
.page-about .page-about__lines {
  display: grid;
  gap: var(--about-gap);
  margin-top: 26px;
}

.page-about .page-about__line {
  position: relative;
  border: 2px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(28, 50, 71, 0.95), rgba(11, 27, 43, 0.95));
  box-shadow: var(--shadow-soft);
  padding: 22px 18px 18px;
}

.page-about .page-about__line::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--lake), var(--grass));
}

.page-about .page-about__line-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .page-about__line h3 {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 19px;
  color: var(--mist);
}

.page-about .page-about__line p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(232, 238, 243, 0.8);
}

.page-about .page-about__line-tail {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--grass) !important;
}

/* ---------- 旧版面板对照 ---------- */
.page-about .page-about__legacy {
  margin-top: clamp(38px, 6vw, 72px);
  padding: clamp(22px, 3.4vw, 40px) clamp(18px, 3vw, 34px);
  border: 2px solid rgba(124, 143, 163, 0.5);
  background:
    repeating-linear-gradient(
      135deg,
      rgba(124, 143, 163, 0.07) 0 12px,
      transparent 12px 24px
    ),
    linear-gradient(160deg, rgba(28, 50, 71, 0.72), rgba(6, 17, 28, 0.94));
  box-shadow: 8px 8px 0 rgba(6, 17, 28, 0.72);
}

.page-about .page-about__legacy-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .page-about__legacy h2 {
  color: rgba(232, 238, 243, 0.86);
}

.page-about .page-about__legacy .prose p {
  color: rgba(232, 238, 243, 0.7);
  font-weight: 300;
}

.page-about .page-about__versions {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .page-about__version {
  border-left: 3px solid var(--legacy);
  padding: 10px 0 10px 14px;
  background: rgba(124, 143, 163, 0.1);
}

.page-about .page-about__version-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--legacy);
  margin-bottom: 6px;
}

.page-about .page-about__version p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(232, 238, 243, 0.68);
  font-weight: 300;
}

.page-about .page-about__legacy-note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(232, 238, 243, 0.62);
  font-weight: 300;
}

.page-about .page-about__legacy-media {
  margin: 0;
  border: 2px solid rgba(124, 143, 163, 0.45);
  background: rgba(6, 17, 28, 0.8);
}

.page-about .page-about__legacy-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.35) brightness(0.95);
}

.page-about .page-about__legacy-media .media-frame__caption {
  color: rgba(124, 143, 163, 0.9);
  font-weight: 300;
}

/* ---------- 更新节奏 ---------- */
.page-about .page-about__rhythm-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 2px solid var(--line-strong);
}

.page-about .page-about__rhythm-item {
  display: grid;
  gap: 8px;
  padding: 18px 16px;
  background: rgba(11, 27, 43, 0.92);
  transition: background 0.25s var(--ease);
}

.page-about .page-about__rhythm-item:hover {
  background: rgba(28, 50, 71, 0.92);
}

.page-about .page-about__rhythm-time {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .page-about__rhythm-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .page-about__rhythm-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 238, 243, 0.76);
}

/* ---------- 团队 ---------- */
.page-about .page-about__team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .page-about__roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .page-about__role {
  border: 2px solid var(--line);
  border-left: 4px solid var(--grass);
  padding: 14px 16px;
  background: rgba(28, 50, 71, 0.55);
}

.page-about .page-about__role-name {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--grass);
  margin-bottom: 6px;
}

.page-about .page-about__role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 238, 243, 0.78);
}

.page-about .page-about__team-media {
  margin: 0;
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  background: var(--steel);
  align-self: start;
}

.page-about .page-about__team-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 时间线 ---------- */
.page-about .page-about__filters {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .page-about__timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .page-about__milestone {
  position: relative;
  margin-left: 8px;
  padding: 0 0 22px 22px;
  border-left: 2px solid var(--line);
}

.page-about .page-about__milestone:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .page-about__milestone::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lake);
  border: 2px solid var(--night);
  box-shadow: 0 0 0 2px rgba(47, 167, 160, 0.3);
}

.page-about .page-about__milestone details {
  border: 2px solid var(--line);
  background: rgba(28, 50, 71, 0.45);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .page-about__milestone details[open] {
  border-color: rgba(47, 167, 160, 0.62);
  background: rgba(28, 50, 71, 0.72);
}

.page-about .page-about__milestone summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .page-about__milestone summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--lake);
}

.page-about .page-about__milestone details[open] summary::after {
  content: "–";
}

.page-about .page-about__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .page-about__milestone-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .page-about__milestone-text {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line);
  padding-top: 12px;
}

.page-about .page-about__milestone-text p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(232, 238, 243, 0.78);
}

/* ---------- 下一步 ---------- */
.page-about .page-about__next {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .page-about__next-inner {
  display: grid;
  gap: 20px;
  border: 2px solid var(--line-strong);
  border-top: 5px solid var(--amber);
  background: linear-gradient(150deg, rgba(28, 50, 71, 0.95), rgba(6, 17, 28, 0.96));
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 3.4vw, 36px);
}

.page-about .page-about__next-inner h2 {
  margin-top: 12px;
}

.page-about .page-about__next-inner p {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(232, 238, 243, 0.8);
}

.page-about .page-about__next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: end;
}

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

  .page-about .page-about__stat {
    padding: 20px 18px;
  }

  .page-about .page-about__rhythm-item {
    grid-template-columns: minmax(140px, 0.32fr) minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    padding: 20px 22px;
  }

  .page-about .page-about__rhythm-time {
    font-size: 14px;
    padding-top: 2px;
  }

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

@media (min-width: 900px) {
  .page-about .page-about__hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
    padding-top: 34px;
  }

  .page-about .page-about__origin-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
  }

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

  .page-about .page-about__legacy-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    align-items: start;
  }

  .page-about .page-about__team-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .page-about__next-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .page-about__milestone summary {
    padding: 16px 20px;
  }

  .page-about .page-about__milestone-text {
    padding: 12px 20px 18px;
  }
}

@media (min-width: 1120px) {
  .page-about .page-about__timeline {
    padding-left: 8px;
  }

  .page-about .page-about__milestone-title {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .page-about__rhythm-item,
  .page-about .page-about__milestone details {
    transition: none;
  }
}
<<<END>>>