.page-about {
  background: var(--pitch);
  color: var(--text);
}

.page-about [id] {
  scroll-margin-top: 6rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2.2rem, 6vw, 4.4rem) clamp(1.8rem, 5vw, 3rem);
  background:
    radial-gradient(120% 95% at 84% 8%, rgba(77, 208, 255, .16), transparent 58%),
    radial-gradient(90% 80% at 6% 96%, rgba(216, 255, 62, .1), transparent 62%),
    linear-gradient(180deg, var(--pitch), var(--ink));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--signal), var(--electric), transparent);
  opacity: .6;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.8rem, 5vw, 3rem);
  align-items: end;
}

.page-about .about-hero__kicker {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-hero__title {
  margin: 0 0 1.1rem;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -.025em;
  color: var(--chalk);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lead {
  margin: 0 0 1.6rem;
  max-width: 58ch;
  font-size: clamp(1rem, 1.7vw, 1.06rem);
  line-height: 1.85;
  color: var(--text-strong);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .about-board {
  display: grid;
  gap: .85rem;
  padding: clamp(1.1rem, 3vw, 1.5rem);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--signal);
  background: linear-gradient(160deg, var(--moss), rgba(11, 13, 12, .92));
  box-shadow: var(--shadow-print);
}

.page-about .about-board__head {
  margin: 0 0 .2rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-board__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: .6rem;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-board__key {
  font-size: .88rem;
  color: var(--text);
}

.page-about .about-board__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.4vw, 1.5rem);
  font-weight: 700;
  color: var(--signal);
}

/* ---------- 横幅 ---------- */
.page-about .about-banner {
  padding-top: clamp(1.4rem, 4vw, 2.4rem);
  background: var(--ink);
}

.page-about .about-banner__media {
  border: 1px solid var(--line);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.4rem;
  margin: 0;
  padding: .95rem 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  padding-bottom: 2px;
  font-size: .875rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--electric);
}

/* ---------- 通用章节块 ---------- */
.page-about .about-section {
  position: relative;
  padding-block: clamp(2.6rem, 7vw, 4.8rem);
}

.page-about .about-section--ink {
  background: var(--ink);
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--ink-text);
}

.page-about .about-head {
  max-width: 64ch;
  margin-bottom: clamp(1.4rem, 4vw, 2.3rem);
}

.page-about .about-head__kicker {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--electric);
}

.page-about .about-head__kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
}

.page-about .about-head__title {
  margin: 0 0 .8rem;
  font-size: clamp(1.65rem, 4.4vw, 2.6rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--chalk);
}

.page-about .about-head__lead {
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.05rem);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-copy {
  max-width: 60ch;
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
}

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

/* ---------- 01 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

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

.page-about .about-paper-card {
  position: relative;
  padding: clamp(1.2rem, 3.4vw, 1.7rem);
  background: var(--paper);
  color: var(--ink-text);
  border: 1px solid rgba(11, 13, 12, .2);
  box-shadow: 6px 6px 0 rgba(11, 13, 12, .55), 12px 12px 0 rgba(245, 241, 230, .08);
}

.page-about .about-paper-card__label {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: #1a6b52;
}

.page-about .about-steps {
  margin: 0 0 .9rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .6rem;
}

.page-about .about-steps__item {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding-bottom: .55rem;
  font-size: .95rem;
  line-height: 1.6;
  border-bottom: 1px dashed rgba(11, 13, 12, .22);
}

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

.page-about .about-steps__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: #10241b;
  background: var(--signal);
  padding: .18rem .45rem;
}

.page-about .about-paper-card__note {
  margin: 0;
  font-size: .84rem;
  color: #4a5a52;
}

/* ---------- 02 四宫格 ---------- */
.page-about .about-grid-2 {
  display: grid;
  gap: clamp(.9rem, 2.6vw, 1.3rem);
}

.page-about .about-tile {
  display: grid;
  gap: .55rem;
  padding: clamp(1.1rem, 3.2vw, 1.5rem);
  background: linear-gradient(165deg, rgba(15, 43, 31, .95), rgba(6, 26, 18, .95));
  border: 1px solid var(--line);
  border-top: 3px solid var(--signal);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-tile:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-print);
  border-color: var(--line-strong);
}

.page-about .about-tile__tag {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  padding: .22rem .55rem;
  color: var(--pitch);
  background: var(--signal);
}

.page-about .about-tile__tag--score {
  color: var(--chalk);
  background: var(--score);
}

.page-about .about-tile__tag--blue {
  color: var(--pitch);
  background: var(--electric);
}

.page-about .about-tile__title {
  margin: 0;
  font-size: clamp(1.1rem, 2.4vw, 1.3rem);
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-tile__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 03 时间线 ---------- */
.page-about .about-section--paper .about-head__title {
  color: #10241b;
}

.page-about .about-section--paper .about-head__lead {
  color: #4a5a52;
}

.page-about .about-section--paper .about-head__kicker {
  color: #1a6b52;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 1px dashed var(--line-strong);
  display: grid;
  gap: clamp(1.2rem, 3.4vw, 1.8rem);
}

.page-about .about-section--paper .about-timeline {
  border-left-color: rgba(11, 13, 12, .24);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 5px);
  top: .45rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(216, 255, 62, .18);
}

.page-about .about-section--paper .about-timeline__item::before {
  background: #10241b;
  box-shadow: 0 0 0 3px rgba(16, 36, 27, .14);
}

.page-about .about-timeline__time {
  margin: 0 0 .3rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--electric);
}

.page-about .about-section--paper .about-timeline__time {
  color: #1a6b52;
}

.page-about .about-timeline__title {
  margin: 0 0 .35rem;
  font-size: clamp(1.05rem, 2.3vw, 1.22rem);
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-section--paper .about-timeline__title {
  color: #10241b;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 60ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-section--paper .about-timeline__text {
  color: #4a5a52;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
  align-items: start;
}

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

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

.page-about .about-team__body .about-head {
  margin-bottom: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-roles {
  counter-reset: role;
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .9rem;
}

.page-about .about-roles li {
  position: relative;
  padding-left: 2.4rem;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-roles li::before {
  counter-increment: role;
  content: counter(role, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .2rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--signal);
  border-bottom: 1px solid rgba(216, 255, 62, .45);
}

.page-about .about-roles strong {
  color: var(--chalk);
  margin-right: .4rem;
}

/* ---------- 05 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
  align-items: center;
}

.page-about .about-partners__body,
.page-about .about-partners__media {
  min-width: 0;
}

.page-about .about-partner-list {
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .9rem;
}

.page-about .about-partner-item {
  padding: .9rem 1rem;
  border-left: 3px solid var(--electric);
  background: rgba(15, 43, 31, .6);
}

.page-about .about-partner-item__type {
  display: block;
  margin-bottom: .3rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--electric);
}

.page-about .about-partner-item__text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .about-tag {
  padding: .38rem .75rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: var(--text-strong);
  background: rgba(216, 255, 62, .07);
  border: 1px solid var(--line-strong);
  transition: color .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-tag:hover {
  color: var(--pitch);
  background: var(--signal);
  border-color: var(--signal);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: clamp(.9rem, 2.6vw, 1.3rem);
}

.page-about .about-next__card {
  display: grid;
  gap: .55rem;
  padding: clamp(1.2rem, 3.2vw, 1.7rem);
  text-decoration: none;
  color: inherit;
  background: linear-gradient(155deg, rgba(15, 43, 31, .95), rgba(6, 26, 18, .95));
  border: 1px solid var(--line);
  border-left: 4px solid var(--signal);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-print);
  border-color: var(--line-strong);
}

.page-about .about-next__tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--electric);
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--chalk);
}

.page-about .about-next__more {
  font-size: .88rem;
  color: var(--signal);
  border-bottom: 1px solid transparent;
}

.page-about .about-next__card:hover .about-next__more {
  border-bottom-color: var(--signal);
}

.page-about .about-next__fallback {
  margin: clamp(1.4rem, 4vw, 2rem) 0 0;
  max-width: 68ch;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-next__fallback a {
  color: var(--electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 208, 255, .45);
}

.page-about .about-next__fallback a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 媒体 ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--moss);
  overflow: hidden;
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media__caption {
  padding: .75rem 1rem;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--text);
  background: rgba(11, 13, 12, .6);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .72fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tile,
  .page-about .about-next__card,
  .page-about .about-tag,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-tile:hover,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}