.page-about {
  --about-measure: 66ch;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about [id] {
  scroll-margin-top: 110px;
}

.page-about .crumbs {
  padding-top: clamp(16px, 2.4vw, 26px);
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 刊头下的长标题首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(26px, 4vw, 50px);
  padding-bottom: clamp(30px, 5vw, 66px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 74px 74px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(26px, 4vw, 46px);
  font-size: clamp(32px, 6.2vw, 76px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__title span {
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 46px);
  align-items: start;
}

.page-about .about-hero__intro {
  margin: 0 0 1.2em;
  max-width: 34em;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-hero__intro--soft {
  color: var(--muted);
  font-size: 16px;
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__chips li {
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  background: var(--panel);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 主栏与左侧索引 ---------- */

.page-about .about-shell {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(28px, 5vw, 56px);
}

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

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-rail__link {
  display: flex;
  gap: 9px;
  align-items: baseline;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-rail__link .mono {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan-deep);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  border-color: var(--line-cyan);
  background: var(--panel-soft);
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 8px 0 8px 14px;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
  }
}

/* ---------- 章节通用 ---------- */

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

.page-about .about-section {
  position: relative;
  padding-top: clamp(22px, 3.4vw, 36px);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-section + .about-section {
  margin-top: clamp(40px, 6vw, 82px);
}

.page-about .about-section::before {
  content: attr(data-index);
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-mono);
  font-size: clamp(58px, 9vw, 128px);
  font-weight: 700;
  line-height: .78;
  letter-spacing: -.04em;
  color: rgba(43, 231, 210, .07);
  pointer-events: none;
  user-select: none;
}

.page-about .about-section__head {
  position: relative;
  z-index: 1;
}

.page-about .about-section__index {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-section__lead {
  position: relative;
  z-index: 1;
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: var(--about-measure);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-section__body {
  position: relative;
  z-index: 1;
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: var(--about-measure);
}

.page-about .about-section__body p {
  margin: 0 0 1.35em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-section__body .about-muted {
  color: var(--muted);
  font-size: 15.5px;
}

.page-about .about-section__body > .about-inline-link {
  display: inline-block;
  margin-bottom: clamp(18px, 3vw, 28px);
  font-size: 14.5px;
}

/* ---------- 米白叠层旁注 ---------- */

.page-about .about-note {
  position: relative;
  max-width: 46ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 18px 20px 20px;
  background: var(--paper);
  color: #16233d;
  border: 1px solid rgba(22, 35, 61, .18);
  box-shadow: 7px 7px 0 rgba(8, 16, 34, .55);
}

.page-about .about-note::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 26px;
  height: 26px;
  background: linear-gradient(225deg, var(--bg) 0 50%, rgba(22, 35, 61, .16) 50% 100%);
}

.page-about .about-note--alt {
  background: #EDE6D8;
}

.page-about .about-note__tag {
  margin: 0 0 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: #8A6410;
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #16233d;
}

.page-about .about-note .about-inline-link {
  color: #0B6B62;
  border-bottom-color: rgba(11, 107, 98, .5);
}

/* ---------- 竖向时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 26px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
  border-left: 1px solid var(--line-cyan);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 12px;
  left: -36px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 8px;
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-timeline__card {
  padding: 16px 18px 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-soft), rgba(14, 30, 60, .32));
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-timeline__card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .about-timeline__tag {
  display: inline-block;
  margin: 0 0 10px;
}

.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 8px;
    bottom: 8px;
    left: 50%;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan), rgba(43, 231, 210, .06));
  }

  .page-about .about-timeline__item {
    width: calc(50% - 46px);
  }

  .page-about .about-timeline__item::before {
    display: none;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }
}

/* ---------- 通用图版 ---------- */

.page-about .about-figure {
  position: relative;
  z-index: 1;
  margin: clamp(26px, 4vw, 44px) 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 四步流程 ---------- */

.page-about .about-steps {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: var(--panel-soft);
}

.page-about .about-steps__no {
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-steps__title {
  margin: 9px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 覆盖数据 ---------- */

.page-about .about-reach {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-reach__cell {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--bg);
  transition: background .24s var(--ease);
}

.page-about .about-reach__cell:hover {
  background: var(--panel);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-reach__unit {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-reach__desc {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
}

@media (min-width: 720px) {
  .page-about .about-reach {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 做法清单 ---------- */

.page-about .about-principles {
  position: relative;
  z-index: 1;
  display: grid;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-principles__item:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-principles__dot {
  width: 8px;
  height: 8px;
  margin-top: 9px;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 231, 210, .14);
}

.page-about .about-principles__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-principles__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收束区 ---------- */

.page-about .about-next {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(48px, 7vw, 92px);
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line-cyan);
  background:
    linear-gradient(135deg, rgba(43, 231, 210, .10), rgba(255, 107, 44, .09) 68%, transparent);
}

.page-about .about-next__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.22;
  color: var(--ink);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--muted);
}

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

@media (min-width: 880px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-reach__cell,
  .page-about .about-rail__link,
  .page-about .about-inline-link {
    transition: none;
  }

  .page-about .about-timeline__card:hover {
    transform: none;
  }
}