.page-about {
  background: var(--nd-ink);
  color: var(--nd-snow);
  overflow-x: hidden;
}

.page-about h2 {
  font-family: var(--nd-display);
  font-weight: 300;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.16;
  letter-spacing: .01em;
  margin: 10px 0 16px;
  color: var(--nd-snow);
}

.page-about h3 {
  font-family: var(--nd-body);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.4;
  margin: 0 0 8px;
  color: var(--nd-snow);
}

.page-about p {
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 248, 251, .8);
  margin: 0 0 14px;
}

.page-about section[id] {
  scroll-margin-top: 92px;
}

.page-about .about-inline {
  color: var(--nd-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 199, 193, .5);
  padding-bottom: 1px;
}

.page-about .about-inline:hover,
.page-about .about-inline:focus-visible {
  border-bottom-color: var(--nd-cyan);
  background: rgba(22, 199, 193, .1);
}

.page-about .about-inline--dark {
  color: #0B3D66;
  border-bottom-color: rgba(11, 61, 102, .5);
}

.page-about .about-inline--dark:hover,
.page-about .about-inline--dark:focus-visible {
  background: rgba(11, 61, 102, .08);
  border-bottom-color: #0B3D66;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--nd-line);
  background:
    radial-gradient(120% 90% at 85% 0%, rgba(22, 199, 193, .16) 0%, transparent 55%),
    linear-gradient(180deg, #04121F 0%, #061A2B 100%);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.85);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: 24px;
  padding-bottom: 32px;
}

.page-about .about-hero__mark {
  font-family: var(--nd-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--nd-cyan);
  margin: 26px 0 14px;
  max-width: none;
}

.page-about h1 {
  font-family: var(--nd-display);
  font-weight: 300;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.04;
  letter-spacing: .005em;
  margin: 0 0 18px;
  max-width: 15ch;
  color: var(--nd-snow);
}

.page-about .about-hero__lede {
  font-size: 16px;
  line-height: 1.85;
  max-width: 60ch;
  color: rgba(244, 248, 251, .84);
  margin-bottom: 32px;
}

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

.page-about .about-stat {
  padding: 16px 14px 18px;
  border-right: 1px solid var(--nd-line-soft);
  border-bottom: 1px solid var(--nd-line-soft);
  background: rgba(6, 26, 43, .55);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 500;
  line-height: 1;
  color: var(--nd-snow);
  margin-bottom: 10px;
}

.page-about .about-stat__num.nd-num--cyan {
  color: var(--nd-cyan);
}

.page-about .about-stat__label {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--nd-mist);
}

/* ---------- 页内索引 ---------- */
.page-about .about-jump {
  border-bottom: 1px solid var(--nd-line);
  background: #04121F;
}

.page-about .about-jump__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 12px;
  padding-bottom: 12px;
  scrollbar-width: none;
}

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

.page-about .about-jump__link {
  flex: 0 0 auto;
  font-family: var(--nd-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--nd-mist);
  text-decoration: none;
  padding: 7px 12px;
  border: 1px solid var(--nd-line-soft);
  white-space: nowrap;
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--nd-ink);
  background: var(--nd-cyan);
  border-color: var(--nd-cyan);
}

/* ---------- 章节纵向刻度 ---------- */
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-chapter__mark {
  position: relative;
  padding-left: 22px;
}

.page-about .about-chapter__mark::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: -22px;
  width: 1px;
  background: var(--nd-line);
}

.page-about .about-chapter__mark::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--nd-cyan);
}

.page-about .about-year {
  display: block;
  font-size: clamp(36px, 9vw, 62px);
  font-weight: 300;
  line-height: .95;
  letter-spacing: .01em;
  color: var(--nd-snow);
}

.page-about .about-chapter__tag {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--nd-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--nd-cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, #061A2B 0%, #0B3D66 120%);
  border-top: 1px solid var(--nd-line-soft);
  border-bottom: 1px solid var(--nd-line-soft);
}

.page-about .about-team__head {
  max-width: 60ch;
  margin-bottom: 30px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

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

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--nd-line);
  background: #0B3D66;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--nd-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--nd-mist);
}

.page-about .about-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-crew__item {
  padding: 18px 0 20px;
  border-top: 1px solid var(--nd-line);
  transition: background .18s ease, border-color .18s ease, padding-left .18s ease;
}

.page-about .about-crew__item:hover,
.page-about .about-crew__item:focus-within {
  border-top-color: var(--nd-cyan);
  background: rgba(22, 199, 193, .06);
  padding-left: 12px;
}

.page-about .about-crew__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--nd-cyan);
  margin-bottom: 8px;
}

.page-about .about-crew__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 248, 251, .76);
  max-width: 52ch;
}

/* ---------- 每周节奏 ---------- */
.page-about .about-cadence {
  background-color: #04121F;
  background-image:
    linear-gradient(to right, rgba(55, 84, 107, .28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(55, 84, 107, .2) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
}

.page-about .about-cadence__head {
  max-width: 58ch;
  margin-bottom: 28px;
}

.page-about .about-cadence__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--nd-line);
}

.page-about .about-cadence__row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0 18px 20px;
  border-bottom: 1px solid var(--nd-line-soft);
}

.page-about .about-cadence__row::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 22px;
  width: 7px;
  height: 7px;
  background: var(--nd-ink);
  border: 1px solid var(--nd-cyan);
}

.page-about .about-cadence__day {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--nd-cyan);
}

.page-about .about-cadence__body h3 {
  margin-bottom: 6px;
}

.page-about .about-cadence__body p {
  margin: 0;
  font-size: 14.5px;
  color: rgba(244, 248, 251, .76);
}

/* ---------- 归档（浅色区） ---------- */
.page-about .about-archive {
  background: var(--nd-snow);
  color: var(--nd-ink);
}

.page-about .about-archive h2 {
  color: var(--nd-ink);
}

.page-about .about-archive p {
  color: rgba(6, 26, 43, .8);
}

.page-about .about-eyebrow--dark {
  color: #6E1F35;
}

.page-about .about-archive__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-archive__head {
  max-width: 62ch;
}

.page-about .about-ruler {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: end;
  gap: 3px;
  height: 54px;
  border-bottom: 1px solid rgba(11, 61, 102, .35);
  padding-bottom: 2px;
}

.page-about .about-ruler span {
  display: block;
  height: 34%;
  background: linear-gradient(180deg, #16C7C1 0%, rgba(11, 61, 102, .5) 100%);
}

.page-about .about-ruler span:nth-child(3n) { height: 68%; }
.page-about .about-ruler span:nth-child(4n) { height: 100%; background: linear-gradient(180deg, #0B3D66 0%, #3B2A6B 100%); }
.page-about .about-ruler span:nth-child(7n) { height: 52%; }

.page-about .about-archive__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  border-top: 1px solid rgba(11, 61, 102, .28);
}

.page-about .about-archive__fact {
  padding: 14px 0 16px;
  border-bottom: 1px solid rgba(11, 61, 102, .18);
}

.page-about .about-archive__fact dt {
  font-family: var(--nd-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: #0B3D66;
  margin-bottom: 6px;
}

.page-about .about-archive__fact dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(6, 26, 43, .78);
}

.page-about .about-archive__more {
  margin: 0;
  font-size: 14.5px;
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(59, 42, 107, .55) 0%, transparent 60%),
    linear-gradient(180deg, #061A2B 0%, #04121F 100%);
}

.page-about .about-versions__head {
  max-width: 58ch;
  margin-bottom: 26px;
}

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

.page-about .about-vtabs .nd-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--nd-line);
  margin-bottom: 20px;
}

.page-about .about-vtabs .nd-tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 1px solid transparent;
  color: var(--nd-mist);
  font-family: var(--nd-mono);
  font-size: 14px;
  letter-spacing: .16em;
  padding: 12px 20px 12px 0;
  margin-right: 12px;
  cursor: pointer;
  transition: color .16s ease, border-color .16s ease;
}

.page-about .about-vtabs .nd-tab:hover,
.page-about .about-vtabs .nd-tab:focus-visible {
  color: var(--nd-snow);
  border-bottom-color: var(--nd-line);
}

.page-about .about-vtabs .nd-tab[aria-selected="true"] {
  color: var(--nd-cyan);
  border-bottom-color: var(--nd-cyan);
}

.page-about .about-vpanel {
  border-left: 1px solid var(--nd-line);
  padding: 4px 0 4px 18px;
}

.page-about .about-vpanel h3 {
  font-family: var(--nd-display);
  font-weight: 400;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: .02em;
  margin-bottom: 10px;
}

.page-about .about-vpanel p {
  font-size: 15px;
  max-width: 62ch;
}

.page-about .about-vpanel__more {
  margin: 18px 0 0;
}

/* ---------- 适合谁 ---------- */
.page-about .about-audience__head {
  max-width: 56ch;
  margin-bottom: 26px;
}

.page-about .about-audience__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--nd-line-soft);
  border: 1px solid var(--nd-line-soft);
}

.page-about .about-audience__item {
  background: #061A2B;
  padding: 20px 18px 22px;
}

.page-about .about-audience__item h3 {
  margin: 12px 0 8px;
  font-size: 16.5px;
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 14.5px;
  color: rgba(244, 248, 251, .76);
}

/* ---------- 联系 ---------- */
.page-about .about-reach {
  border-top: 1px solid var(--nd-line);
  background: linear-gradient(120deg, #0B3D66 0%, #3B2A6B 140%);
}

.page-about .about-reach__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .about-reach__text p {
  color: rgba(244, 248, 251, .84);
  margin-bottom: 0;
}

.page-about .about-reach__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-reach__actions .nd-btn {
  text-align: center;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__inner {
    padding-top: 28px;
    padding-bottom: 44px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-crew {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 28px;
  }

  .page-about .about-archive__facts {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 32px;
  }

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

  .page-about .about-reach__actions {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (min-width: 960px) {
  .page-about .about-chapter__grid {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 32px;
    row-gap: 0;
  }

  .page-about .about-chapter__mark {
    grid-column: 1 / span 2;
  }

  .page-about .about-chapter__body {
    grid-column: 4 / span 6;
  }

  .page-about .about-chapter__mark::before {
    bottom: 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-cadence__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    padding-left: 26px;
  }

  .page-about .about-cadence__day {
    padding-top: 2px;
  }

  .page-about .about-archive__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-archive__head {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-ruler {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .about-archive__facts {
    grid-column: 2;
    grid-row: 1 / span 2;
    grid-template-columns: 1fr;
  }

  .page-about .about-archive__more {
    grid-column: 1 / -1;
    grid-row: 3;
    margin-top: 6px;
  }

  .page-about .about-audience__list {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-reach__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-reach__actions {
    flex-direction: column;
    justify-content: center;
  }

  .page-about .about-vtabs .nd-tablist {
    gap: 4px;
  }
}

@media (min-width: 1180px) {
  .page-about h1 {
    font-size: 82px;
  }

  .page-about .about-chapter__body {
    grid-column: 4 / span 7;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__item,
  .page-about .about-vtabs .nd-tab {
    transition: none;
  }
}