.page-about {
  background-color: var(--wf-night);
  color: var(--wf-snow);
  font-family: var(--wf-font-sans);
}

.page-about .about-crumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: 1px solid var(--wf-line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  padding: 24px 0 32px;
}

.page-about .about-hero__title {
  margin: 12px 0 20px;
  font-size: clamp(32px, 6.4vw, 56px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--wf-snow);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--wf-mist);
}

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

.page-about .about-hero__meta {
  border-top: 2px solid var(--wf-lake);
  padding-top: 18px;
}

.page-about .about-hero__meta-label {
  margin: 0 0 4px;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--wf-mist);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--wf-line);
}

.page-about .about-facts__label {
  font-size: 14px;
  color: var(--wf-mist);
}

.page-about .about-facts__num {
  font-family: var(--wf-font-mono);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--wf-gold);
  white-space: nowrap;
}

.page-about .about-banner {
  position: relative;
  margin: 0 0 32px;
  border: 1px solid var(--wf-line);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: clamp(160px, 28vw, 320px);
  object-fit: cover;
  filter: saturate(0.75) contrast(1.08);
}

.page-about .about-banner__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: rgba(6, 18, 31, 0.82);
  border-top: 1px solid var(--wf-line);
  border-right: 1px solid var(--wf-line);
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--wf-mist);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-bottom: 24px;
}

.page-about .about-shell {
  display: block;
}

.page-about .about-rail {
  padding: 20px 0 4px;
  border-bottom: 1px solid var(--wf-line);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--wf-mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--wf-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--wf-ease), background-color var(--wf-ease), border-color var(--wf-ease);
}

.page-about .about-rail__link:hover {
  color: var(--wf-snow);
  background-color: var(--wf-surface);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--wf-gold);
  outline-offset: 2px;
  color: var(--wf-snow);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--wf-snow);
  border-left-color: var(--wf-gold);
  background-color: var(--wf-surface);
}

.page-about .about-rail__no {
  font-family: var(--wf-font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--wf-gold);
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  padding: 36px 0;
  border-top: 1px solid var(--wf-line);
  scroll-margin-top: 132px;
}

.page-about .about-block__no {
  margin: 0;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--wf-gold);
}

.page-about .about-block__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.26;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--wf-snow);
}

.page-about .about-block__lead {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--wf-mist);
}

.page-about .about-caption {
  margin: 10px 0 0;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  color: var(--wf-mist);
}

.page-about .about-content a {
  color: var(--wf-lake);
  text-decoration: none;
  border-bottom: 1px solid var(--wf-lake-deep);
  transition: color var(--wf-ease), border-color var(--wf-ease);
}

.page-about .about-content a:hover {
  color: var(--wf-lake-light);
  border-bottom-color: var(--wf-lake);
}

/* ---------- 01 定位 ---------- */
.page-about .about-statement {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .about-statement__big {
  margin: 0;
  padding-left: 18px;
  border-left: 3px solid var(--wf-lake);
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.55;
  font-weight: 700;
  color: var(--wf-snow);
}

.page-about .about-statement__side p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--wf-mist);
}

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

/* ---------- 02 年份轨道 ---------- */
.page-about .track {
  margin-top: 26px;
  overflow-x: auto;
  padding-bottom: 10px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .track:focus-visible {
  outline: 2px solid var(--wf-gold);
  outline-offset: 4px;
}

.page-about .track__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  min-width: max-content;
}

.page-about .track__list::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--wf-line);
}

.page-about .track__item {
  position: relative;
  flex: 0 0 224px;
  padding: 0 26px 0 0;
  scroll-snap-align: start;
}

.page-about .track__mark {
  display: block;
  width: 10px;
  height: 10px;
  margin: 6px 0 20px;
  background: var(--wf-lake-deep);
  border: 1px solid var(--wf-lake);
  position: relative;
  z-index: 1;
}

.page-about .track__item:last-child .track__mark {
  background: var(--wf-gold);
  border-color: var(--wf-gold-light);
}

.page-about .track__no {
  margin: 0;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--wf-gold-light);
}

.page-about .track__title {
  margin: 8px 0 8px;
  font-size: 16px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--wf-snow);
}

.page-about .track__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--wf-mist);
}

/* ---------- 03 团队 ---------- */
.page-about .roles {
  margin-top: 26px;
}

.page-about .roles__bar {
  display: flex;
  height: 40px;
  border: 1px solid var(--wf-line);
}

.page-about .roles__seg {
  display: block;
  height: 100%;
}

.page-about .roles__seg--data {
  flex: 8 1 0;
  background-color: var(--wf-lake-light);
}

.page-about .roles__seg--sched {
  flex: 7 1 0;
  background-color: var(--wf-lake);
}

.page-about .roles__seg--fe {
  flex: 6 1 0;
  background-color: var(--wf-lake-deep);
}

.page-about .roles__seg--cs {
  flex: 5 1 0;
  background-color: var(--wf-card-lift);
}

.page-about .roles__legend {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.page-about .roles__legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  color: var(--wf-mist);
}

.page-about .roles__swatch {
  display: block;
  width: 10px;
  height: 10px;
}

.page-about .roles__swatch--data {
  background-color: var(--wf-lake-light);
}

.page-about .roles__swatch--sched {
  background-color: var(--wf-lake);
}

.page-about .roles__swatch--fe {
  background-color: var(--wf-lake-deep);
}

.page-about .roles__swatch--cs {
  background-color: var(--wf-card-lift);
  border: 1px solid var(--wf-line);
}

.page-about .roles__body {
  display: grid;
  gap: 20px;
  margin-top: 26px;
}

.page-about .roles__cards {
  display: grid;
  gap: 12px;
}

.page-about .role-card {
  padding: 16px 18px;
  background-color: var(--wf-card);
  border: 1px solid var(--wf-line);
  cursor: default;
  transition: background-color var(--wf-ease), border-color var(--wf-ease);
}

.page-about .role-card:hover,
.page-about .role-card:focus-visible {
  background-color: var(--wf-card-lift);
  border-color: var(--wf-lake);
}

.page-about .role-card:focus-visible {
  outline: 2px solid var(--wf-gold);
  outline-offset: 2px;
}

.page-about .role-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .role-card__no,
.page-about .role-card__count {
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--wf-mist);
}

.page-about .role-card__count {
  color: var(--wf-gold);
}

.page-about .role-card__title {
  margin: 8px 0 6px;
  font-size: 20px;
  font-weight: 700;
  color: var(--wf-snow);
}

.page-about .role-card__brief {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--wf-mist);
}

.page-about .role-card__detail {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--wf-snow);
  transition: max-height var(--wf-ease), opacity var(--wf-ease), margin-top var(--wf-ease);
}

.page-about .role-card:hover .role-card__detail,
.page-about .role-card:focus-visible .role-card__detail,
.page-about .role-card:focus-within .role-card__detail {
  max-height: 140px;
  opacity: 1;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--wf-line);
}

.page-about .roles__media {
  margin: 0;
}

.page-about .roles__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--wf-line);
  filter: saturate(0.72) contrast(1.06);
}

/* ---------- 04 版本节奏 ---------- */
.page-about .version {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

.page-about .version__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--wf-line);
}

.page-about .version__item {
  padding: 16px 0;
  border-bottom: 1px solid var(--wf-line);
}

.page-about .version__step {
  margin: 0;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--wf-lake);
}

.page-about .version__title {
  margin: 8px 0 8px;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--wf-snow);
}

.page-about .version__text {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.74;
  color: var(--wf-mist);
}

.page-about .version__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--wf-line);
  overflow: hidden;
}

.page-about .version__media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 160px;
  max-height: 300px;
  object-fit: cover;
  opacity: 0.72;
}

/* ---------- 05 服务覆盖 ---------- */
.page-about .coverage {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

.page-about .coverage__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
  max-width: 420px;
  border: 1px solid var(--wf-line);
  padding: 10px;
  background-color: var(--wf-surface);
}

.page-about .coverage__dot {
  position: relative;
  aspect-ratio: 1 / 1;
  background-color: var(--wf-lake-deep);
  border: 1px solid var(--wf-line);
  transition: background-color var(--wf-ease), border-color var(--wf-ease);
}

.page-about .coverage__dot:hover {
  background-color: var(--wf-lake);
  border-color: var(--wf-lake-light);
}

.page-about .coverage__dot--home {
  background-color: var(--wf-gold);
  border-color: var(--wf-gold-light);
}

.page-about .coverage__dot::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 8px;
  background-color: var(--wf-card);
  border: 1px solid var(--wf-line);
  font-family: var(--wf-font-mono);
  font-size: 12px;
  white-space: nowrap;
  color: var(--wf-snow);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--wf-ease);
  z-index: 3;
}

.page-about .coverage__dot:hover::after {
  opacity: 1;
}

.page-about .coverage__caption {
  margin: 12px 0 0;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--wf-mist);
}

.page-about .about-info {
  margin: 0;
  border-top: 1px solid var(--wf-line);
}

.page-about .about-info__row {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--wf-line);
}

.page-about .about-info dt {
  flex: 0 0 88px;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--wf-mist);
  padding-top: 2px;
}

.page-about .about-info dd {
  margin: 0;
  flex: 1 1 200px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--wf-snow);
  word-break: break-word;
}

/* ---------- 06 工作方式 ---------- */
.page-about .principles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .principles__item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--wf-line);
}

.page-about .principles__item:last-child {
  border-bottom: 1px solid var(--wf-line);
}

.page-about .principles__no {
  flex: 0 0 auto;
  font-family: var(--wf-font-cond);
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--wf-lake-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .principles__body {
  min-width: 0;
}

.page-about .principles__title {
  margin: 0 0 8px;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--wf-snow);
}

.page-about .principles__text {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.76;
  color: var(--wf-mist);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 22px;
  margin: 8px 0 56px;
  padding: 28px 22px;
  background-color: var(--wf-surface);
  border: 1px solid var(--wf-line);
  border-left: 3px solid var(--wf-gold);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 8px;
  font-family: var(--wf-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--wf-gold);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.4;
  font-weight: 700;
  color: var(--wf-snow);
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 36em;
  font-size: 14px;
  line-height: 1.76;
  color: var(--wf-mist);
}

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

.page-about .about-cta__link {
  font-size: 14px;
  color: var(--wf-mist);
  text-decoration: none;
  border-bottom: 1px solid var(--wf-line);
  transition: color var(--wf-ease), border-color var(--wf-ease);
}

.page-about .about-cta__link:hover {
  color: var(--wf-lake-light);
  border-bottom-color: var(--wf-lake);
}

.page-about .about-cta__link:focus-visible {
  outline: 2px solid var(--wf-gold);
  outline-offset: 2px;
}

/* ---------- 中等宽度 ---------- */
@media (min-width: 680px) {
  .page-about .about-statement {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .roles__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 28px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 272px;
    gap: 56px;
    padding: 40px 0 48px;
  }

  .page-about .about-hero__meta {
    border-top-width: 2px;
  }

  .page-about .about-shell {
    display: grid;
    grid-template-columns: 192px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
    padding: 52px 0 0;
    border-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-rail__list > li {
    flex: 1 1 auto;
  }

  .page-about .about-rail__link {
    padding-right: 0;
  }

  .page-about .about-content {
    min-width: 0;
  }

  .page-about .about-block {
    padding: 52px 0;
  }

  .page-about .roles__body {
    grid-template-columns: minmax(0, 1fr) 296px;
    gap: 24px;
    align-items: start;
  }

  .page-about .version {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 36px;
    align-items: start;
  }

  .page-about .version__media img {
    min-height: 220px;
    max-height: 340px;
  }

  .page-about .coverage {
    grid-template-columns: 420px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .principles__item {
    gap: 24px;
    padding: 24px 0;
  }

  .page-about .principles__no {
    font-size: 44px;
  }
}