.page-about {
  --about-rail-w: 236px;
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 24px 0 4px;
  font-size: 14px;
  color: var(--muted);
}
.page-about .crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .crumb a:hover {
  color: var(--ink-green);
  border-bottom-color: var(--line-strong);
}
.page-about .crumb [aria-current="page"] {
  color: var(--ink-green);
  font-weight: 700;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 18px;
  padding-bottom: 8px;
}
.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  align-items: end;
}
.page-about .about-hero__title {
  margin: 10px 0 16px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--ink-green);
  max-width: 13ch;
}
.page-about .about-hero__lede {
  margin: 0 0 24px;
  font-size: 18px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 42ch;
}
.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.page-about .about-fact {
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
}
.page-about .about-fact__n {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-green);
}
.page-about .about-fact__l {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}
.page-about .about-hero__fig {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-lift);
}
.page-about .about-hero__fig::before {
  content: "";
  display: block;
  height: 6px;
  background: linear-gradient(90deg,
    var(--spring) 0 25%,
    var(--summer) 25% 50%,
    var(--autumn) 50% 75%,
    var(--winter-ice) 75% 100%);
}
.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 8px;
  align-items: start;
}
.page-about .about-flow {
  min-width: 0;
}

/* 侧轨 */
.page-about .about-rail {
  display: grid;
  gap: 28px;
}
.page-about .about-rail__block .eyebrow {
  display: block;
  margin-bottom: 12px;
}
.page-about .rail-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
}
.page-about .rail-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    var(--spring) 0%,
    var(--summer) 36%,
    var(--autumn) 70%,
    var(--winter-ice) 100%);
}
.page-about .rail-tl__item {
  margin: 0;
}
.page-about .rail-tl__link {
  position: relative;
  display: block;
  padding: 7px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms ease;
}
.page-about .rail-tl__link::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 12px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--line-strong);
  transition: border-color 180ms ease, background 180ms ease;
}
.page-about .rail-tl__link:hover {
  color: var(--ink-green);
}
.page-about .rail-tl__link:hover::before {
  border-color: var(--ink-green);
  background: var(--spring);
}

.page-about .legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .legend__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  font-size: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--slot);
  border-radius: var(--radius);
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.page-about .legend__item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-paper);
}
.page-about .legend__item--spring { --slot: var(--spring); }
.page-about .legend__item--summer { --slot: var(--summer); }
.page-about .legend__item--autumn { --slot: var(--autumn); }
.page-about .legend__item--winter { --slot: var(--winter-ice); }
.page-about .legend__name {
  font-weight: 700;
  color: var(--ink-green);
}
.page-about .legend__desc {
  margin-left: auto;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 折叠摘要 ---------- */
.page-about .about-fold {
  margin: 0 0 26px;
  padding: 2px 20px 2px;
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-top: 4px solid var(--ink-green);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-paper);
}
.page-about .about-fold summary {
  padding: 14px 0;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-green);
}
.page-about .about-fold[open] summary {
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-fold__list {
  margin: 0 0 16px;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}
.page-about .about-fold__list li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节 ---------- */
.page-about [data-season="spring"] { --accent: var(--spring); }
.page-about [data-season="summer"] { --accent: var(--summer); }
.page-about [data-season="autumn"] { --accent: var(--autumn); }
.page-about [data-season="winter"] { --accent: var(--winter-ice); }

.page-about .about-sec {
  padding: 32px 0 10px;
  border-top: 2px solid var(--accent, var(--line-strong));
  scroll-margin-top: 24px;
}
.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}
.page-about .about-sec__num {
  flex: none;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-green);
  border: 2px solid var(--accent, var(--line-strong));
  border-radius: 999px;
}
.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink-green);
}
.page-about .prose {
  min-width: 0;
}
.page-about .prose p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 60ch;
}
.page-about .about-note {
  margin: 22px 0 6px;
  padding: 16px 18px;
  max-width: 62ch;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent, var(--line-strong));
  border-radius: 0 var(--radius) var(--radius) 0;
}
.page-about .about-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 四季卡片 ---------- */
.page-about .season-cards {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
.page-about .season-cards__item {
  padding: 16px 18px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--slot);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
}
.page-about .season-cards__item--spring { --slot: var(--spring); }
.page-about .season-cards__item--summer { --slot: var(--summer); }
.page-about .season-cards__item--autumn { --slot: var(--autumn); }
.page-about .season-cards__item--winter { --slot: var(--winter-ice); }
.page-about .season-cards__badge {
  display: inline-block;
  margin-bottom: 10px;
  padding: 1px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-green);
  border: 1px solid var(--slot);
  border-radius: 999px;
}
.page-about .season-cards__title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-green);
}
.page-about .season-cards__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 配图 ---------- */
.page-about .about-fig {
  margin: 0 0 22px;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-paper);
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  position: relative;
  margin: 24px 0 0;
  padding: 0 0 0 24px;
}
.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    var(--spring) 0%,
    var(--summer) 36%,
    var(--autumn) 70%,
    var(--winter-ice) 100%);
}
.page-about .about-tl__item {
  position: relative;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.page-about .about-tl__item:last-child {
  border-bottom: 0;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 18px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--accent, var(--line-strong));
}
.page-about .about-tl__item:nth-child(4n+1) { --accent: var(--spring); }
.page-about .about-tl__item:nth-child(4n+2) { --accent: var(--summer); }
.page-about .about-tl__item:nth-child(4n+3) { --accent: var(--autumn); }
.page-about .about-tl__item:nth-child(4n+4) { --accent: var(--winter-ice); }
.page-about .about-tl__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 5px;
}
.page-about .about-tl__when {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-green);
}
.page-about .about-tl__ver {
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.page-about .about-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  max-width: 58ch;
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}
.page-about .about-team {
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.page-about .about-team h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-green);
}
.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 服务数据 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
.page-about .about-stats li {
  padding-top: 12px;
  border-top: 3px solid var(--accent, var(--line-strong));
}
.page-about .about-stats__n {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-green);
}
.page-about .about-stats__l {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}
.page-about .about-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 26px;
  padding: 16px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
.page-about .about-contact__text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-contact__text strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink-green);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-top: 52px;
  padding-bottom: 76px;
}
.page-about .about-cta__inner {
  position: relative;
  overflow: hidden;
  padding: 42px 26px 34px;
  background: var(--ink-green);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lift);
}
.page-about .about-cta__inner::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 6px;
  background: linear-gradient(90deg,
    var(--spring) 0 25%,
    var(--summer) 25% 50%,
    var(--autumn) 50% 75%,
    var(--winter-ice) 75% 100%);
}
.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--on-dark-strong);
}
.page-about .about-cta p {
  margin: 0 0 24px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--on-dark);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 768px) {
  .page-about .season-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cta__inner {
    padding: 48px 44px 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
  }
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 64px;
  }
  .page-about .about-rail {
    position: sticky;
    top: 28px;
  }
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-fig--square img {
    max-height: 420px;
  }
}

@media (max-width: 480px) {
  .page-about .about-facts {
    grid-template-columns: 1fr;
  }
  .page-about .about-sec__head {
    flex-wrap: wrap;
    gap: 10px;
  }
  .page-about .about-contact {
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
  }
}