.page-about {
  --about-line: rgba(185, 138, 69, 0.35);
  --about-line-soft: rgba(214, 179, 106, 0.26);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: 32px 0 48px;
  background:
    radial-gradient(92% 68% at 88% -12%, rgba(185, 138, 69, 0.18), transparent 62%),
    linear-gradient(180deg, var(--paper) 0%, var(--cream) 100%);
  border-bottom: 1px solid var(--border);
}

.page-about .about-cover__grid {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-cover h1 {
  font-family: var(--serif);
  font-size: clamp(32px, 6.6vw, 58px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--green);
  margin: 18px 0 20px;
}

.page-about .about-cover .lede {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.9;
  color: var(--ink-mute);
  max-width: 48ch;
  margin: 0;
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .about-cover__media .media-frame {
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  background: var(--green-deep);
}

.page-about .about-cover__media figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--bar-h);
  z-index: 6;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0;
  padding: 14px 0 13px;
  background: var(--cream);
  border-bottom: 1px solid var(--border);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-mute);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--green);
  border-color: var(--bronze);
  background: rgba(185, 138, 69, 0.12);
}

.page-about .about-toc a[aria-current] {
  color: var(--green);
  border-color: var(--bronze);
  background: rgba(185, 138, 69, 0.16);
}

/* ---------- 通用章节标题 ---------- */
.page-about h2 {
  font-family: var(--serif);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.24;
  color: var(--green);
  margin: 14px 0 0;
}

.page-about .lede {
  font-size: clamp(16px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--ink-mute);
  margin: 18px 0 0;
  max-width: 62ch;
}

/* ---------- 01 缘起 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 26px;
  padding: 56px 0;
}

.page-about .about-origin__body p {
  margin: 0 0 20px;
  font-size: 17px;
  line-height: 1.95;
  color: var(--ink);
}

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

.page-about .about-quote {
  margin: 30px 0;
  padding: 22px 24px;
  border-left: 3px solid var(--bronze);
  background: var(--paper);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.78;
  color: var(--green);
}

/* ---------- 02 使命 ---------- */
.page-about .about-mission {
  padding: 60px 0;
}

.page-about .about-mission h2 {
  color: var(--cream);
}

.page-about .about-mission__lede {
  color: rgba(245, 240, 230, 0.74);
}

.page-about .about-mission__list {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-mission__item {
  padding: 24px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-mission__item h3 {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.4;
  color: var(--bronze-soft);
  margin: 0 0 10px;
}

.page-about .about-mission__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(245, 240, 230, 0.76);
}

/* ---------- 03 历程 ---------- */
.page-about .about-journey {
  padding: 56px 0;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 40px 0 0;
  padding: 0 0 0 34px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--bronze) 0%, rgba(185, 138, 69, 0.12) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 15px;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--bronze);
}

.page-about .about-phase {
  border: 1px solid var(--border);
  background: var(--paper);
  padding: 0 20px;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-phase[open] {
  background: #ffffff;
  border-color: var(--bronze);
}

.page-about .about-phase > summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  cursor: pointer;
  padding: 18px 0;
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
  color: var(--green);
  list-style: none;
}

.page-about .about-phase > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-phase > summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 18px;
  color: var(--bronze);
}

.page-about .about-phase[open] > summary::after {
  content: "–";
}

.page-about .about-phase__body {
  padding: 0 0 20px;
}

.page-about .about-phase__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.92;
  color: var(--ink-mute);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  padding: 52px 0 60px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.page-about .about-team__card {
  padding: 26px 24px 28px;
}

.page-about .about-team__num {
  display: block;
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 42px;
  line-height: 1;
  color: var(--bronze);
}

.page-about .about-team__card h3 {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.4;
  color: var(--green);
  margin: 0 0 10px;
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--ink-mute);
}

/* ---------- 05 服务网络 ---------- */
.page-about .about-network {
  padding: 56px 0;
  background:
    radial-gradient(80% 70% at 8% 0%, rgba(114, 140, 122, 0.14), transparent 60%),
    var(--paper);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.page-about .about-network__grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-network__body p {
  margin: 18px 0 0;
  font-size: 16.5px;
  line-height: 1.92;
  color: var(--ink);
  max-width: 56ch;
}

.page-about .about-network__facts {
  margin: 30px 0 0;
  display: grid;
  gap: 0;
}

.page-about .about-network__facts > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--border);
}

.page-about .about-network__facts > div:first-child {
  border-top: 1px solid var(--border);
}

.page-about .about-network__facts dt {
  font-size: 14.5px;
  color: var(--ink-mute);
}

.page-about .about-network__facts dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 16px;
  color: var(--green);
  text-align: right;
}

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

.page-about .about-network__map .media-frame {
  border: 1px solid var(--border);
  background: var(--cream);
  box-shadow: var(--shadow-card);
}

.page-about .about-network__map figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* ---------- 06 荣誉与合作 ---------- */
.page-about .about-recognition {
  padding: 56px 0;
}

.page-about .about-recognition__grid {
  display: grid;
  gap: 34px;
  margin-top: 34px;
  align-items: start;
}

.page-about .about-recognition__col h3 {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.page-about .about-recognition__col h3 + * {
  margin-top: 0;
}

.page-about .about-recognition__col h3:not(:first-child) {
  margin-top: 36px;
}

.page-about .about-honor-list,
.page-about .about-partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-honor-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-left: 3px solid var(--bronze);
}

.page-about .about-honor__year {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--bronze);
}

.page-about .about-honor__name {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
  color: var(--green);
}

.page-about .about-partner-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(205, 187, 154, 0.6);
}

.page-about .about-partner__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 24px;
  line-height: 1;
  color: var(--sage);
}

.page-about .about-partner__text {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-mute);
}

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

.page-about .about-recognition__media .media-frame {
  border: 1px solid var(--border);
  background: var(--green-deep);
  box-shadow: var(--shadow-card);
}

.page-about .about-recognition__media figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* ---------- 07 继续了解 ---------- */
.page-about .about-contact {
  padding: 60px 0 68px;
}

.page-about .about-contact h2 {
  color: var(--cream);
}

.page-about .about-contact__lede {
  color: rgba(245, 240, 230, 0.74);
}

.page-about .about-contact__mail {
  color: var(--bronze-soft);
  font-family: var(--mono);
  font-size: 0.94em;
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-all;
}

.page-about .about-contact__mail:hover {
  color: var(--amber);
}

.page-about .about-contact__links {
  display: grid;
  gap: 12px;
  margin-top: 36px;
}

.page-about .about-contact__link {
  display: block;
  padding: 20px 22px 22px;
  border: 1px solid var(--about-line-soft);
  background: rgba(6, 26, 23, 0.46);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-contact__link:hover,
.page-about .about-contact__link:focus-visible {
  border-color: var(--bronze);
  background: rgba(6, 26, 23, 0.72);
  transform: translateY(-2px);
}

.page-about .about-contact__link h3 {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.4;
  color: var(--bronze-soft);
  margin: 0 0 8px;
}

.page-about .about-contact__link p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.72);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-contact__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 880px) {
  .page-about .about-cover {
    padding: 48px 0 72px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
    gap: 62px;
  }

  .page-about .about-cover__media::before {
    content: "";
    position: absolute;
    inset: 16px -16px -16px 16px;
    border: 1px solid var(--about-line);
    pointer-events: none;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
    gap: 56px;
    padding: 84px 0;
  }

  .page-about .about-origin__aside {
    position: sticky;
    top: calc(var(--bar-h) + 76px);
    align-self: start;
  }

  .page-about .about-mission {
    padding: 84px 0;
  }

  .page-about .about-mission__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin-top: 46px;
  }

  .page-about .about-mission__item {
    padding: 6px 30px;
    border-top: 0;
    border-left: 1px solid var(--about-line-soft);
  }

  .page-about .about-mission__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-mission__item:last-child {
    padding-right: 0;
  }

  .page-about .about-journey {
    padding: 84px 0;
  }

  .page-about .about-timeline {
    margin-top: 48px;
    padding-left: 44px;
  }

  .page-about .about-timeline::before {
    left: 7px;
  }

  .page-about .about-timeline__item {
    padding-bottom: 26px;
  }

  .page-about .about-timeline__item::before {
    left: -44px;
    top: 17px;
    width: 15px;
    height: 15px;
  }

  .page-about .about-phase {
    padding: 0 28px;
  }

  .page-about .about-phase > summary {
    font-size: 20px;
    padding: 20px 0;
  }

  .page-about .about-team {
    padding: 76px 0 84px;
  }

  .page-about .about-network {
    padding: 84px 0;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 56px;
  }

  .page-about .about-recognition {
    padding: 84px 0;
  }

  .page-about .about-recognition__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 52px;
  }

  .page-about .about-contact {
    padding: 88px 0 96px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-cover__grid {
    gap: 76px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
  }
}

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

  .page-about .about-contact__link:hover,
  .page-about .about-contact__link:focus-visible {
    transform: none;
  }
}