.page-about {
  --about-rule: rgba(23, 54, 42, 0.9);
  --about-rule-soft: rgba(23, 54, 42, 0.55);
  --about-index-w: 132px;
  --about-note-w: 116px;
  --about-ink-soft: #5A5348;
  padding-block: 1.75rem 4.5rem;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-figcap {
  margin: 0;
  padding: 0.7rem 0.95rem;
  border-top: 1px solid var(--about-rule-soft);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: 2rem;
  margin-top: 1.5rem;
}

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

.page-about .about-hero__title {
  margin: 0.5rem 0 1rem;
  font-size: clamp(2.1rem, 5.6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.5rem;
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  line-height: 1.1;
  color: var(--lime);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--panel);
  box-shadow: var(--shadow-lift);
  align-self: start;
}

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

/* ---------- 通用章节头 ---------- */

.page-about .about-section {
  margin-top: 4.5rem;
}

.page-about .about-section__head {
  max-width: 66ch;
  margin-bottom: 2rem;
}

.page-about .about-section__head h2 {
  margin: 0.4rem 0 0.8rem;
  font-size: clamp(1.6rem, 3.4vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-section__intro {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 年份索引 + 纵向叙事 ---------- */

.page-about .about-timeline__layout {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-index__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.35rem 0;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__list a .mono {
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--text);
  border-left-color: var(--lime);
}

.page-about .about-index__list a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-year {
  padding: 1.5rem 0 1.7rem;
  border-top: 1px solid var(--about-rule);
  scroll-margin-top: calc(var(--frame-top) + 28px);
}

.page-about .about-year:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-year__head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 0.55rem;
}

.page-about .about-year__num {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .about-year h3 {
  margin: 0 0 0.5rem;
  font-size: 1.02rem;
  line-height: 1.45;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-year p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

.page-about .about-timeline__notes {
  display: none;
}

/* ---------- 四组人 ---------- */

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-team__item {
  padding: 1.35rem 0 1.5rem;
  border-bottom: 1px solid var(--about-rule-soft);
  min-width: 0;
}

.page-about .about-team__count {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin: 0 0 0.55rem;
}

.page-about .about-team__count .mono {
  font-size: clamp(1.7rem, 3.4vw, 2.1rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__unit {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-team__item h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  color: var(--text);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 四道工序 ---------- */

.page-about .about-flow__layout {
  display: grid;
  gap: 2rem;
}

.page-about .about-flow__figure {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--panel);
}

.page-about .about-flow__figure img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1.1rem 1rem;
  border: 1px solid var(--about-rule);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .about-step + .about-step {
  margin-top: 0.6rem;
}

.page-about .about-step:hover {
  border-color: rgba(199, 255, 61, 0.5);
  box-shadow: var(--shadow-lift);
  transform: translateY(-1px);
}

.page-about .about-step:focus-within {
  border-color: var(--lime);
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-step__no {
  padding-top: 0.15rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--orange);
}

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

.page-about .about-step h3 {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
  color: var(--text);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 协作与认可 ---------- */

.page-about .about-partners__figure {
  margin: 0 0 1.75rem;
  border: 1px solid var(--about-rule);
  background: var(--panel);
}

.page-about .about-partners__figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.page-about .about-partners__body {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-partners__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  border-top: 1px solid var(--about-rule);
  padding-top: 1.25rem;
}

.page-about .about-partners__num {
  display: block;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-partners__label {
  display: block;
  margin-top: 0.45rem;
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-partners__honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-partners__honors li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--about-rule);
  background: var(--ink-soft);
  font-size: 0.9rem;
  color: var(--text);
}

/* ---------- 奶油纸档案块 ---------- */

.page-about .about-craft__paper {
  color: var(--paper-ink);
  background: var(--paper);
  border: 1px solid rgba(29, 26, 22, 0.16);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.3);
  padding: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-craft__eyebrow {
  color: #7A6F5E;
  margin: 0;
}

.page-about .about-craft__paper h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.5rem, 3.2vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper-ink);
}

.page-about .about-craft__list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.4rem;
}

.page-about .about-craft__list li {
  border-top: 2px solid var(--paper-ink);
  padding-top: 0.85rem;
  min-width: 0;
}

.page-about .about-craft__list h3 {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  color: var(--paper-ink);
}

.page-about .about-craft__list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 行动区 ---------- */

.page-about .about-cta {
  margin-top: 4.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-cta h2 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.5rem, 3.2vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-craft__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.75rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr) var(--about-note-w);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-timeline__index {
    position: sticky;
    top: calc(var(--frame-top) + 22px);
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    margin-top: 0.9rem;
  }

  .page-about .about-index__list a {
    padding: 0.45rem 0 0.45rem 0.6rem;
    border-left: 2px solid var(--about-rule);
  }

  .page-about .about-timeline__notes {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding-top: 0.4rem;
  }

  .page-about .about-railnote {
    margin: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 11px;
    letter-spacing: 0.16em;
    line-height: 1.6;
    color: var(--muted);
  }

  .page-about .about-partners__body {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    gap: 2.5rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-flow__layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 3rem;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-team__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-index__list a {
    transition: none;
  }

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