.page-about {
  --about-card: #fffdf8;
  --about-line: rgba(185, 130, 69, 0.28);
  --about-line-strong: rgba(185, 130, 69, 0.55);
  --about-ink-line: rgba(201, 216, 226, 0.18);
  background: var(--paper);
  color: var(--ink-text);
}

.page-about .about-top {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 44px) 0 clamp(38px, 6vw, 78px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink-950);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 56ch;
  color: var(--ink-700);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__index {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__index-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 14px;
  border-left: 2px solid var(--about-line-strong);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--ink-900);
}

.page-about .about-num__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: linear-gradient(150deg, var(--ink-900), var(--ink-700));
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__media .media__caption {
  padding: 12px 18px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-200);
}

/* ---------- 快速了解 ---------- */
.page-about .about-map {
  border-top: var(--hair);
  border-bottom: var(--hair);
  background: rgba(233, 201, 161, 0.14);
}

.page-about .about-map__inner {
  padding: clamp(16px, 2.6vw, 24px) 0;
}

.page-about .about-map__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-map__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 16px 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-line);
  background: rgba(255, 253, 248, 0.72);
  color: var(--ink-700);
  font-size: 14px;
  text-decoration: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-map__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .about-map__link:hover {
  background: var(--copper-light);
  border-color: var(--about-line-strong);
  transform: translateY(-2px);
}

.page-about .about-map__link:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

/* ---------- 区块通用 ---------- */
.page-about .about-block {
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-rail__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink-950);
}

.page-about .about-rail__text {
  margin: 16px 0 0;
  color: var(--slate);
  line-height: 1.85;
  max-width: 34ch;
}

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.page-about .about-principle {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background: var(--about-card);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-principle:hover,
.page-about .about-principle:focus-within {
  transform: translateY(-2px);
  border-color: var(--about-line-strong);
  background: #fffefb;
  box-shadow: var(--shadow-soft);
}

.page-about .about-principle__dot {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(240, 90, 60, 0.14);
}

.page-about .about-principle__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 24px);
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .about-principle__text {
  margin: 10px 0 0;
  line-height: 1.85;
  color: var(--ink-text);
}

.page-about .about-principle__case {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-principle__case-label {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--celadon);
}

/* ---------- 发展阶段（墨蓝块） ---------- */
.page-about .about-stages {
  background: var(--ink-900);
  color: var(--mist-200);
  position: relative;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--copper), var(--coral) 62%, transparent);
}

.page-about .about-eyebrow--onink {
  color: var(--copper-light);
}

.page-about .about-stages__head {
  max-width: 60ch;
}

.page-about .about-stages__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-stages__text {
  margin: 14px 0 0;
  color: var(--mist-200);
  line-height: 1.85;
}

.page-about .about-stages__media {
  margin: clamp(26px, 4vw, 40px) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-ink-line);
}

.page-about .about-stages__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-stages__media .media__caption {
  padding: 10px 16px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist-200);
  opacity: 0.75;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  display: grid;
  gap: 12px;
  padding: 22px 16px;
  border-top: 1px solid var(--about-ink-line);
  border-radius: var(--radius-md);
  transition: background var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  background: rgba(201, 216, 226, 0.07);
}

.page-about .about-timeline__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--copper);
  padding-left: 12px;
  border-left: 2px solid var(--copper);
  align-self: start;
}

.page-about .about-timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  line-height: 1.85;
  color: var(--mist-200);
}

.page-about .about-timeline__list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-timeline__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-200);
}

.page-about .about-timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--celadon);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-950));
}

.page-about .about-team__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__media .media__caption {
  padding: 10px 16px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-200);
}

.page-about .about-team__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(27px, 4.2vw, 40px);
  line-height: 1.2;
  color: var(--ink-950);
}

.page-about .about-team__text {
  margin: 14px 0 0;
  line-height: 1.85;
  color: var(--ink-text);
  max-width: 60ch;
}

.page-about .about-team__roster {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__member {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-line);
  background: var(--about-card);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-team__member:hover {
  border-color: var(--about-line-strong);
  transform: translateY(-2px);
}

.page-about .about-team__count {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  color: var(--copper);
}

.page-about .about-team__role {
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .about-team__duty {
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-team__note {
  margin: 22px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--celadon);
  background: rgba(111, 165, 148, 0.1);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 内容与版本 ---------- */
.page-about .about-gov__head {
  max-width: 62ch;
}

.page-about .about-gov__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.22;
  color: var(--ink-950);
}

.page-about .about-gov__text {
  margin: 14px 0 0;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-gov__grid {
  display: grid;
  gap: 12px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-gov__cell {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-line);
  background: var(--about-card);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-gov__cell:hover {
  border-color: var(--about-line-strong);
  background: rgba(233, 201, 161, 0.22);
}

.page-about .about-gov__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--copper);
}

.page-about .about-gov__cell-title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  color: var(--ink-900);
}

.page-about .about-gov__cell p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-archive {
  margin-top: clamp(24px, 3.4vw, 36px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background: rgba(255, 253, 248, 0.7);
  overflow: hidden;
}

.page-about .about-archive__label {
  margin: 0;
  padding: 14px 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  background: rgba(201, 216, 226, 0.26);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-archive__item + .about-archive__item {
  border-top: 1px solid var(--about-line);
}

.page-about .about-archive__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
  list-style: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-archive__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-archive__summary:hover {
  background: rgba(233, 201, 161, 0.28);
}

.page-about .about-archive__summary:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: -2px;
}

.page-about .about-archive__sign {
  flex: none;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--copper);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-archive__item[open] .about-archive__sign {
  transform: rotate(45deg);
}

.page-about .about-archive__panel {
  padding: 0 20px 18px;
}

.page-about .about-archive__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 会馆体验 ---------- */
.page-about .about-exp {
  background: linear-gradient(180deg, rgba(201, 216, 226, 0.24), rgba(247, 244, 236, 0));
}

.page-about .about-exp__head {
  max-width: 60ch;
}

.page-about .about-exp__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.22;
  color: var(--ink-950);
}

.page-about .about-exp__text {
  margin: 14px 0 0;
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .about-exp__list {
  display: grid;
  gap: 14px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-exp__item {
  padding: 20px 22px 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background: var(--about-card);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-exp__item:hover {
  border-color: var(--about-line-strong);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.page-about .about-exp__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-exp__item-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-exp__item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-text);
}

.page-about .about-exp__link {
  margin: clamp(24px, 3.4vw, 32px) 0 0;
}

/* ---------- 结尾通道 ---------- */
.page-about .about-cta {
  background: var(--ink-950);
  color: var(--mist-200);
  padding: clamp(40px, 5.6vw, 72px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 4vw, 36px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-cta__text p {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.85;
  color: var(--mist-200);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-cta__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 6px;
}

.page-about .about-cta__mail {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--copper-light);
  word-break: break-all;
}

.page-about .about-cta .copy-btn {
  border: 1px solid var(--about-ink-line);
  background: rgba(201, 216, 226, 0.08);
  color: var(--mist-200);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-cta .copy-btn:hover {
  background: rgba(233, 201, 161, 0.2);
  border-color: var(--copper);
  color: var(--paper);
}

.page-about .about-cta .copy-btn:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-about .about-cta .copy-btn[data-copied="true"] {
  border-color: var(--celadon);
  color: var(--celadon);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-timeline__item {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }

  .page-about .about-hero__media {
    margin-top: 6px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-team__media {
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-principles {
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__link,
  .page-about .about-principle,
  .page-about .about-team__member,
  .page-about .about-gov__cell,
  .page-about .about-exp__item,
  .page-about .about-archive__sign,
  .page-about .about-timeline__item {
    transition-duration: 1ms;
  }

  .page-about .about-map__link:hover,
  .page-about .about-principle:hover,
  .page-about .about-principle:focus-within,
  .page-about .about-team__member:hover,
  .page-about .about-exp__item:hover {
    transform: none;
  }
}