/* ===== 品牌文化 · page-about ===== */

.page-about {
  --about-rail: 188px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-pad-x: clamp(16px, 4vw, 56px);
  background: var(--c-cream);
  color: var(--c-ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  background: var(--grad-orange);
  border-bottom: 1px solid var(--c-line);
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 6vw, 72px);
}

.page-about .about-hero .breadcrumbs {
  margin: 0 0 20px;
  font-size: 13px;
  color: var(--c-gray);
}

.page-about .about-hero__frame {
  position: relative;
  background: rgba(255, 255, 255, .64);
  border: 1px solid var(--c-copper-soft);
  padding: clamp(20px, 4vw, 46px) clamp(16px, 4vw, 50px) clamp(22px, 4vw, 44px);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  border: 1px solid var(--c-copper);
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-copper);
  margin-bottom: 14px;
}

.page-about .about-hero__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(26px, 4.8vw, 46px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--c-green);
  margin: 0 0 18px;
  max-width: 20em;
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.78;
  color: var(--c-ink);
  max-width: 36em;
  margin: 0 0 22px;
}

.page-about .about-hero__scale {
  height: 9px;
  border-top: 1px solid var(--c-copper-soft);
  background-image: repeating-linear-gradient(90deg, var(--c-copper-soft) 0 1px, transparent 1px 14px);
  margin: 0 0 22px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .about-fact {
  background: var(--c-paper);
  padding: 14px 15px 16px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--c-orange-dk);
}

.page-about .about-fact__unit {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: .46em;
  letter-spacing: .02em;
  margin-left: .16em;
  color: var(--c-gray);
  vertical-align: .16em;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--c-gray);
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(36px, 6vw, 76px);
}

/* ---------- 年份轨道 ---------- */

.page-about .year-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-copper);
  margin: 0 0 10px;
}

.page-about .year-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  padding: 8px 12px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-gray);
  text-decoration: none;
  font-size: 13px;
  line-height: 1;
  white-space: nowrap;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}

.page-about .year-rail__link:focus-visible {
  outline: 2px solid var(--c-copper);
  outline-offset: 2px;
}

.page-about .year-rail__year {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-orange-dk);
  letter-spacing: .04em;
}

.page-about .year-rail__tag {
  display: none;
  font-size: 12px;
  color: var(--c-gray);
}

/* ---------- 章节通用 ---------- */

.page-about .chapter {
  scroll-margin-top: calc(var(--topline-h) + 24px);
}

.page-about .chapter + .chapter {
  margin-top: clamp(30px, 4.5vw, 52px);
  padding-top: clamp(30px, 4.5vw, 52px);
  border-top: 1px solid var(--c-green-lt);
}

.page-about .chapter__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-copper);
  margin-bottom: 12px;
}

.page-about .chapter__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.28;
  color: var(--c-green);
  margin: 0 0 16px;
  max-width: 26em;
}

.page-about .chapter__lead {
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--c-ink);
  max-width: 34em;
  margin: 0 0 20px;
}

.page-about .chapter__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  max-width: 34em;
}

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

.page-about .chapter__text a {
  color: var(--c-orange-dk);
  text-decoration: underline;
  text-decoration-color: var(--c-copper-soft);
  text-underline-offset: 3px;
}

.page-about .chapter__text a:hover,
.page-about .chapter__text a:focus-visible {
  text-decoration-color: var(--c-orange);
}

.page-about .chapter__split {
  display: grid;
  gap: 22px;
}

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

.page-about .chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-paper);
}

.page-about .chapter__figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--c-copper-soft);
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-gray);
  max-width: 30em;
}

.page-about .takeaway {
  margin: 20px 0 0;
  padding: 12px 16px;
  background: var(--c-green-soft);
  border-left: 2px solid var(--c-orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-green);
  max-width: 34em;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--c-copper-soft);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 26px;
  scroll-margin-top: calc(var(--topline-h) + 28px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--c-paper);
  border: 1px solid var(--c-copper);
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .timeline__item:target::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--c-copper);
  margin-bottom: 5px;
}

.page-about .timeline__item:target .timeline__year {
  color: var(--c-orange-dk);
}

.page-about .timeline__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17.5px;
  line-height: 1.4;
  color: var(--c-green);
  margin: 0 0 7px;
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-ink);
  max-width: 34em;
}

/* ---------- 三条做法 ---------- */

.page-about .method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .method {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 20px 18px;
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .method:hover,
.page-about .method:focus-within {
  transform: translateY(-2px);
  border-color: var(--c-copper);
  box-shadow: 0 6px 0 -4px var(--c-copper-soft);
}

.page-about .method__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-copper);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .method__title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.42;
  color: var(--c-green);
  margin: 0 0 10px;
}

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

.page-about .method__text a {
  color: var(--c-orange-dk);
  text-decoration: underline;
  text-decoration-color: var(--c-copper-soft);
  text-underline-offset: 3px;
}

.page-about .method__text a:hover,
.page-about .method__text a:focus-visible {
  text-decoration-color: var(--c-orange);
}

/* ---------- 团队数据 ---------- */

.page-about .stat-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.page-about .stat {
  border-top: 2px solid var(--c-green);
  padding-top: 13px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--c-orange-dk);
}

.page-about .stat__unit {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: .36em;
  letter-spacing: .02em;
  margin-left: .2em;
  color: var(--c-gray);
  vertical-align: .28em;
}

.page-about .stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-gray);
}

/* ---------- 覆盖 ---------- */

.page-about .chapter__figure--wide {
  margin: 0 0 22px;
}

.page-about .chapter__figure--wide img {
  aspect-ratio: 3 / 2;
}

/* ---------- 协作 ---------- */

.page-about .partner-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .partner-list li {
  padding: 7px 13px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-paper);
  color: var(--c-green);
  font-size: 13.5px;
  line-height: 1.5;
}

.page-about .partner-list .num {
  font-family: var(--font-mono);
  color: var(--c-orange-dk);
  margin-right: .14em;
}

/* ---------- 下一步 ---------- */

.page-about .about-next-wrap {
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-next {
  background: var(--c-green);
  color: var(--c-cream);
  border-top: 3px solid var(--c-orange);
  padding: clamp(24px, 4vw, 40px);
}

.page-about .about-next__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.32;
  color: var(--c-cream);
  margin: 0 0 20px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__list a {
  display: block;
  padding: 12px 14px;
  color: var(--c-cream);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.6;
  border: 1px solid rgba(251, 246, 238, .26);
  border-radius: var(--radius);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--c-orange-lt);
  background: rgba(251, 246, 238, .08);
}

.page-about .about-next__list a:focus-visible {
  outline: 2px solid var(--c-orange-lt);
  outline-offset: 2px;
}

/* ---------- 中等屏幕 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .stat-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 22px;
  }
}

@media (min-width: 820px) {
  .page-about .chapter__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 30%);
    column-gap: clamp(20px, 3.4vw, 44px);
    align-items: start;
  }

  .page-about .chapter__split--flip {
    grid-template-columns: minmax(0, 34%) minmax(0, 1fr);
  }

  .page-about .chapter__split--flip .chapter__figure {
    order: -1;
  }

  .page-about .chapter__figure--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面：左侧年份轨道 ---------- */

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .year-rail {
    position: sticky;
    top: calc(var(--topline-h) + 28px);
    align-self: start;
  }

  .page-about .year-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--c-copper-soft);
  }

  .page-about .year-rail__link {
    display: block;
    flex: initial;
    position: relative;
    padding: 13px 0 13px 24px;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
  }

  .page-about .year-rail__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 20px;
    width: 12px;
    height: 1px;
    background: var(--c-copper);
    transition: width .18s var(--ease), background .18s var(--ease);
  }

  .page-about .year-rail__link:hover,
  .page-about .year-rail__link:focus-visible {
    color: var(--c-ink);
    background: transparent;
  }

  .page-about .year-rail__link:hover::before,
  .page-about .year-rail__link:focus-visible::before {
    width: 20px;
    background: var(--c-orange);
  }

  .page-about .year-rail__year {
    display: block;
    font-size: 15px;
  }

  .page-about .year-rail__tag {
    display: block;
    margin-top: 3px;
  }

  .page-about .method-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
<<<END>>>