.page-about {
  --about-card-gap: 20px;
  --about-radius: 0px;
}

.page-about .about-crumb-sep {
  margin: 0 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(40px, 6vw, 84px) 0 clamp(28px, 4vw, 48px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 6.4vw, 84px);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 18px 0 0;
  max-width: 18ch;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 26px 0 0;
  max-width: 68ch;
  color: var(--silver);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 2px solid var(--line);
}

.page-about .about-fact {
  background: var(--ink-2);
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1;
  color: var(--accent);
  font-weight: 500;
}

.page-about .about-fact__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

/* ---------- 通栏图 ---------- */

.page-about .about-banner {
  margin: 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-banner__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 7;
}

/* ---------- 双栏骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-top: clamp(56px, 8vw, 110px);
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
  margin: 0 0 14px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  counter-reset: idx;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-left: 2px solid var(--line-soft);
  color: var(--silver);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 11px;
  color: var(--line);
  transition: color 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link.is-active {
  border-left-color: var(--accent);
  color: var(--white);
  background: var(--ink-2);
}

.page-about .about-index__link:hover .mono,
.page-about .about-index__link.is-active .mono {
  color: var(--accent-soft);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-bottom: clamp(64px, 8vw, 120px);
}

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

.page-about .about-section .exhibit {
  margin-bottom: 28px;
}

.page-about .about-section__lead {
  max-width: 66ch;
  color: var(--silver);
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 32px;
}

.page-about .about-section a {
  color: var(--accent-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-section a:hover {
  color: var(--accent);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 24px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-soft) 22%, var(--line) 62%, var(--line-soft) 100%);
}

.page-about .about-stage {
  position: relative;
  margin-bottom: 26px;
}

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

.page-about .about-stage__dot {
  position: absolute;
  left: -24px;
  top: 24px;
  width: 12px;
  height: 12px;
  margin-left: -5px;
  border: 2px solid var(--line);
  background: var(--ink);
  z-index: 1;
}

.page-about .about-stage--now .about-stage__dot {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.16);
  animation: about-pulse 3s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.14); }
  50% { box-shadow: 0 0 0 10px rgba(255, 90, 31, 0.04); }
}

.page-about .about-stage__card {
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  padding: 20px 20px 22px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-stage__card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-stage__card.is-current {
  border-left: 6px solid var(--accent);
}

.page-about .about-stage__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

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

.page-about .about-stage__name {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 400;
  color: var(--white);
  margin: 0 0 10px;
  line-height: 1.1;
}

.page-about .about-stage__line {
  color: var(--silver);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 16px;
}

.page-about .about-stage__caps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

.page-about .about-stage__caps li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-stage__caps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--amber);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .about-team__lead {
  color: var(--silver);
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 26px;
  max-width: 60ch;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--line);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  background: var(--ink-2);
  padding: 18px 18px 20px;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-role:hover {
  background: var(--panel);
  box-shadow: inset 3px 0 0 var(--accent);
}

.page-about .about-role__num {
  font-size: 30px;
  line-height: 1;
  color: var(--accent);
  font-weight: 500;
  padding-top: 2px;
}

.page-about .about-role__name {
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
  margin: 0 0 6px;
}

.page-about .about-role__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
  margin: 0;
}

.page-about .about-team__figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
  padding: 10px;
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 5 / 4;
  background: var(--panel);
}

.page-about .about-team__caption {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--silver);
  padding: 12px 4px 4px;
  line-height: 1.6;
}

/* ---------- 归档数据 ---------- */

.page-about .about-archive__plates {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--line);
  margin-bottom: 30px;
}

.page-about .about-plate {
  background: var(--ink-2);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-plate .plate__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .about-plate .plate__value {
  font-size: 24px;
  color: var(--white);
}

.page-about .about-archive__figure {
  margin: 0 0 28px;
  border-left: 6px solid var(--accent);
  padding-left: 14px;
}

.page-about .about-archive__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-archive__caption {
  font-size: 12px;
  color: var(--silver);
  line-height: 1.65;
  padding-top: 10px;
  letter-spacing: 0.03em;
}

.page-about .about-archive__tail {
  color: var(--silver);
  font-size: 15px;
  line-height: 1.85;
  margin: 0;
  max-width: 64ch;
}

/* ---------- 更新节奏 ---------- */

.page-about .about-rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.page-about .about-rhythm__card {
  border: 2px solid var(--line);
  background: var(--panel);
  padding: 22px 20px 24px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-rhythm__card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-rhythm__card--big {
  background: var(--ink-2);
  border-left: 6px solid var(--accent-soft);
}

.page-about .about-rhythm__tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--amber);
  padding: 4px 10px;
  margin-bottom: 14px;
}

.page-about .about-rhythm__card--big .about-rhythm__tag {
  background: var(--accent);
  color: var(--white);
}

.page-about .about-rhythm__name {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 400;
  color: var(--white);
  margin: 0 0 10px;
  line-height: 1.15;
}

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

.page-about .about-rhythm__tail {
  color: var(--silver);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  max-width: 64ch;
}

/* ---------- 服务覆盖 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-coverage__stats {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--line);
}

.page-about .about-stat {
  background: var(--ink-2);
  padding: 18px 20px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-stat:hover {
  background: var(--panel);
  box-shadow: inset 3px 0 0 var(--accent);
}

.page-about .about-stat__num {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--white);
  font-weight: 500;
}

.page-about .about-stat__unit {
  font-size: 0.5em;
  color: var(--accent);
  margin-left: 2px;
}

.page-about .about-stat__label {
  font-size: 13px;
  color: var(--silver);
  letter-spacing: 0.04em;
  text-align: right;
}

.page-about .about-coverage__note p {
  color: var(--silver);
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 16px;
  max-width: 62ch;
}

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

/* ---------- 下一步 ---------- */

.page-about .about-next {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-next__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  border-top: 2px solid var(--line);
  padding-top: 16px;
  transition: border-color 0.3s var(--ease);
}

.page-about .about-next__item:hover {
  border-top-color: var(--accent);
}

.page-about .about-next__no {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 2px solid var(--line);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-next__item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
  margin: 2px 0 0;
}

.page-about .about-cta {
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
  padding: 24px 22px 26px;
}

.page-about .about-cta__text {
  color: var(--silver);
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 20px;
  max-width: 62ch;
}

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

/* ---------- 平板与桌面 ---------- */

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

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

  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 20px;
  }

  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 36px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-stage:nth-child(1) .about-stage__card { width: 64%; }
  .page-about .about-stage:nth-child(2) .about-stage__card { width: 76%; }
  .page-about .about-stage:nth-child(3) .about-stage__card { width: 88%; }
  .page-about .about-stage:nth-child(4) .about-stage__card { width: 100%; }

  .page-about .about-stage {
    margin-bottom: 34px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 60px;
  }

  .page-about .about-index {
    position: sticky;
    top: 104px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: 44px;
  }

  .page-about .about-stage:nth-child(1) .about-stage__card { width: 62%; }
  .page-about .about-stage:nth-child(2) .about-stage__card { width: 74%; }
  .page-about .about-stage:nth-child(3) .about-stage__card { width: 86%; }
  .page-about .about-stage:nth-child(4) .about-stage__card { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage--now .about-stage__dot {
    animation: none;
  }

  .page-about .about-stage__card,
  .page-about .about-rhythm__card,
  .page-about .about-role,
  .page-about .about-stat,
  .page-about .about-next__item {
    transition: none;
  }
}
<<<END>>>