.page-about {
  --about-rail: 128px;
  --about-shell-pad: clamp(18px, 4vw, 52px);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: 20px;
  padding-bottom: 4px;
}

.page-about .about-crumb-wrap .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--haze);
}

.page-about .about-crumb-wrap .breadcrumb a {
  color: var(--blue);
  text-decoration: none;
}

.page-about .about-crumb-wrap .breadcrumb a:hover,
.page-about .about-crumb-wrap .breadcrumb a:focus-visible {
  color: var(--green);
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(48px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -14%;
  width: 52vw;
  height: 52vw;
  max-width: 640px;
  max-height: 640px;
  background: radial-gradient(circle at 40% 40%, rgba(21, 145, 106, .16), rgba(21, 145, 106, 0) 68%);
  border-radius: 46% 54% 62% 38% / 52% 44% 56% 48%;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .about-hero__media {
  order: 2;
  margin: 0;
  position: relative;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: auto -10px -12px auto;
  width: 46%;
  height: 42%;
  background: var(--gold-soft);
  border-radius: 40% 60% 52% 48% / 56% 44% 60% 40%;
  z-index: -1;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 28px 20px 32px 22px;
  box-shadow: var(--shadow-2);
}

.page-about .about-hero__copy {
  order: 1;
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--green-900);
  background: var(--gold-soft);
  border-radius: 10px 6px 10px 6px;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--green-900);
}

.page-about .about-hero__lead {
  margin: 0 0 16px;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 2.4vw, 17px);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-hero__lead--soft {
  color: var(--haze);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 2px solid var(--gold);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 86px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--green);
}

.page-about .about-fact__lbl {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--haze);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(48px, 7vw, 84px) 0;
}

.page-about .about-head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-head .section-head__title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-head .section-head__num {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--green);
}

.page-about .about-head .section-head__note {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--haze);
}

/* ---------- 01 时间线 ---------- */
.page-about .about-chapter--timeline {
  background: linear-gradient(180deg, var(--paper) 0%, rgba(21, 145, 106, .07) 100%);
}

.page-about .tl {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 22px 0 24px;
  border-top: 2px solid var(--gold);
  cursor: default;
  transition: background-color .3s var(--ease);
}

.page-about .tl__item:last-child {
  border-bottom: 2px solid var(--gold);
}

.page-about .tl__item:focus-visible,
.page-about .role:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
  box-shadow: 0 0 0 2px var(--ink);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--green);
}

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

.page-about .tl__title {
  margin: 0 0 8px;
  display: inline-block;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  border-bottom: 2px dashed transparent;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .tl__desc {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .tl__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--haze);
  transition: max-height .38s var(--ease), opacity .28s var(--ease), margin-top .3s var(--ease);
}

.page-about .tl__item:hover,
.page-about .tl__item:focus {
  background-color: rgba(247, 215, 155, .34);
}

.page-about .tl__item:hover .tl__title,
.page-about .tl__item:focus .tl__title {
  color: var(--green-900);
  border-bottom-color: var(--gold);
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus .tl__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 02 岗位 ---------- */
.page-about .roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .role {
  position: relative;
  padding: 26px 22px 28px;
  background: var(--white);
  border-radius: var(--r-card);
  border-top: 4px solid var(--green-500);
  box-shadow: var(--shadow-1);
  transition: transform .28s var(--ease), background-color .28s var(--ease), border-color .28s var(--ease);
}

.page-about .role:nth-child(even) {
  border-top-color: var(--blue);
}

.page-about .role:first-child {
  border-top-color: var(--gold);
  background: linear-gradient(160deg, rgba(247, 215, 155, .38), var(--white) 62%);
}

.page-about .role:hover,
.page-about .role:focus {
  transform: translateY(-4px);
  background: var(--gold-soft);
  border-top-color: var(--green-900);
}

.page-about .role__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 46px;
  line-height: 1;
  color: var(--green);
}

.page-about .role__mark {
  display: block;
  width: 30px;
  height: 8px;
  margin-bottom: 4px;
  background: var(--gold);
  border-radius: 8px 4px 8px 4px;
}

.page-about .role__name {
  margin: 10px 0 10px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--haze);
}

/* ---------- 03 流程 ---------- */
.page-about .about-chapter--flow {
  position: relative;
  background: var(--green-900);
  color: var(--paper);
  overflow: hidden;
}

.page-about .about-chapter--flow .about-head .section-head__title {
  color: var(--white);
}

.page-about .about-chapter--flow .about-head .section-head__num {
  color: var(--gold);
}

.page-about .about-chapter--flow .about-head .section-head__note {
  color: rgba(245, 242, 234, .74);
}

.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  position: relative;
  padding: 24px 22px 26px;
  background: rgba(245, 242, 234, .06);
  border-radius: var(--r-soft);
  border-left: 4px solid var(--gold);
  transition: background-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .flow__item:hover {
  background: rgba(247, 215, 155, .16);
  transform: translateY(-3px);
}

.page-about .flow__n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  border-radius: 12px 8px 14px 8px;
}

.page-about .flow__name {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.32;
  color: var(--white);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: rgba(245, 242, 234, .8);
}

.page-about .about-flow__figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: 22px 16px 24px 16px;
  filter: saturate(.92) contrast(1.04);
}

/* ---------- 04 本地小组 ---------- */
.page-about .about-local__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-local__text {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-local__list {
  margin: 22px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 2px solid var(--gold);
}

.page-about .about-local__list li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 12px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-local__dot {
  position: absolute;
  left: 0;
  top: .58em;
  width: 9px;
  height: 9px;
  background: var(--green-500);
  border-radius: 3px 1px 3px 1px;
}

.page-about .about-local__media {
  position: relative;
  margin: 0;
}

.page-about .about-local__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 24px 18px 28px 20px;
  box-shadow: var(--shadow-2);
}

.page-about .about-local__media::before {
  content: "";
  position: absolute;
  top: -14px;
  left: -14px;
  width: 44%;
  height: 40%;
  background: rgba(44, 127, 184, .2);
  border-radius: 48% 52% 40% 60% / 58% 42% 58% 42%;
  z-index: -1;
}

/* ---------- 05 合作网络 ---------- */
.page-about .about-chapter--partner {
  background: linear-gradient(180deg, rgba(232, 163, 61, .12) 0%, var(--paper) 62%);
}

.page-about .partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .partner {
  padding: 26px 22px 28px;
  background: var(--white);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-1);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .partner:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .partner--lead {
  background: var(--green);
  border-left: 6px solid var(--gold);
}

.page-about .partner--lead .partner__num,
.page-about .partner--lead .partner__name {
  color: var(--white);
}

.page-about .partner--lead .partner__desc {
  color: rgba(245, 242, 234, .82);
}

.page-about .partner__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 46px;
  line-height: 1;
  color: var(--green);
}

.page-about .partner__name {
  margin: 12px 0 10px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .partner__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--haze);
}

/* ---------- 06 使用状况 ---------- */
.page-about .figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .fig {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 18px 24px;
  background: var(--white);
  border-radius: var(--r-soft);
  border-bottom: 3px solid var(--blue);
}

.page-about .fig:nth-child(2) {
  border-bottom-color: var(--gold);
}

.page-about .fig:nth-child(3) {
  border-bottom-color: var(--green-500);
}

.page-about .fig__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  color: var(--ink);
}

.page-about .fig__unit {
  margin-left: 3px;
  font-size: .5em;
  font-weight: 500;
  color: var(--haze);
}

.page-about .fig__label {
  font-size: 13.5px;
  letter-spacing: .03em;
  color: var(--haze);
}

.page-about .about-scale__note {
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.76;
  color: var(--ink);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: clamp(48px, 7vw, 86px) 0 clamp(56px, 8vw, 96px);
  background: var(--green-900);
  color: var(--paper);
}

.page-about .about-close__head {
  margin: 0 0 20px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-close__sub {
  margin: 0 0 28px;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(245, 242, 234, .78);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-close__actions .btn--line {
  border-color: rgba(245, 242, 234, .5);
  color: var(--paper);
}

.page-about .about-close__actions .btn--line:hover {
  background: var(--gold-soft);
  border-color: var(--gold);
  color: var(--ink);
}

/* ---------- 响应式：窄屏防溢出 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero__facts {
    gap: 12px 20px;
  }

  .page-about .about-fact {
    min-width: 74px;
  }

  .page-about .about-fact__num {
    font-size: 28px;
  }

  .page-about .tl__year {
    font-size: 24px;
  }

  .page-about .role__num,
  .page-about .partner__num {
    font-size: 36px;
  }

  .page-about .about-close__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

/* ---------- 响应式：平板 ---------- */
@media (min-width: 720px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .role:first-child {
    grid-column: 1 / -1;
  }

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

  .page-about .partner--lead {
    grid-column: 1 / -1;
  }

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

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 0.84fr) minmax(0, 1fr);
    gap: clamp(30px, 4.6vw, 70px);
    align-items: center;
  }

  .page-about .about-hero__media {
    order: 1;
    margin-top: 14px;
  }

  .page-about .about-hero__media::after {
    inset: auto -32px -22px auto;
  }

  .page-about .about-hero__copy {
    order: 2;
    padding-top: 8px;
  }

  .page-about .tl__item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 40px;
    padding: 30px 24px 32px 16px;
    border-radius: 6px;
  }

  .page-about .tl__item:last-child {
    border-bottom: 2px solid var(--gold);
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
  }

  .page-about .about-local__media {
    margin-top: 34px;
  }

  .page-about .about-chapter--partner .partners {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .partner--lead {
    grid-column: auto;
    padding: 34px 28px 36px;
  }
}

/* ---------- 响应式：宽屏流程横向排布 ---------- */
@media (min-width: 960px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .flow__item {
    padding: 26px 20px 30px;
  }

  .page-about .flow__item::after {
    content: "→";
    position: absolute;
    top: 34px;
    right: -15px;
    font-family: var(--font-mono);
    font-size: 18px;
    color: var(--gold);
    z-index: 2;
  }

  .page-about .flow__item:last-child::after {
    display: none;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item,
  .page-about .tl__more,
  .page-about .tl__title,
  .page-about .role,
  .page-about .flow__item,
  .page-about .partner {
    transition: none;
  }

  .page-about .role:hover,
  .page-about .role:focus,
  .page-about .flow__item:hover,
  .page-about .partner:hover {
    transform: none;
  }
}