.page-about {
  --about-line: rgba(39, 245, 210, 0.18);
  --about-line-strong: rgba(39, 245, 210, 0.45);
  --about-paper-line: rgba(29, 20, 16, 0.16);
  --about-paper-ink: #241a14;
  --about-paper-soft: #4a3b33;
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 26px);
  margin-bottom: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 34px);
  padding-bottom: var(--sec);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__lede {
  max-width: 66ch;
  min-width: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 6.4vw, 50px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--text);
  margin: 0.5em 0 0.55em;
  text-shadow: 0 0 28px rgba(39, 245, 210, 0.16);
}

.page-about .about-hero .lede {
  color: var(--text-soft);
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

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

.page-about .about-stats__item {
  background: var(--stand);
  padding: clamp(14px, 2.6vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-stats__label {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text-soft);
  line-height: 1.5;
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  padding: var(--sec) 0 0;
}

.page-about .tl__head {
  max-width: 64ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .tl__head h2 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.3;
  color: var(--text);
  margin: 0.45em 0 0;
}

.page-about .tl__lede {
  color: var(--text-soft);
  line-height: 1.8;
  font-size: 15px;
  margin: 14px 0 0;
}

.page-about .tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl__item {
  position: relative;
  padding-left: 46px;
  padding-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 20px;
  bottom: -4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(39, 245, 210, 0.45), rgba(39, 245, 210, 0.07));
}

.page-about .tl__item:last-child::before {
  display: none;
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 20px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(39, 245, 210, 0.08);
}

.page-about .tl__node {
  background: var(--stand);
  border: 1px solid var(--about-line);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.page-about .tl__node:hover {
  border-color: rgba(39, 245, 210, 0.42);
  transform: translateY(-2px);
}

.page-about .tl__node[open] {
  border-color: var(--about-line-strong);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
}

.page-about .tl__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: clamp(14px, 2.4vw, 20px);
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .tl__ver {
  font-family: var(--font-display);
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .tl__stage {
  font-family: var(--font-serif);
  font-size: clamp(15px, 2.3vw, 18px);
  line-height: 1.5;
  color: var(--text);
  min-width: 0;
}

.page-about .tl__hint {
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--ease);
}

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

.page-about .tl__body {
  padding: 14px clamp(14px, 2.4vw, 20px) clamp(16px, 2.6vw, 22px);
  border-top: 1px dashed rgba(39, 245, 210, 0.2);
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .tl__body p {
  margin: 0 0 10px;
}

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

.page-about .tl__body figure {
  margin: 0 0 14px;
  border: 1px solid var(--about-line);
  background: var(--night-deep);
}

.page-about .tl__body img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 纸质色带：项目与分类 ---------- */
.page-about .band--paper {
  background: var(--cream);
  color: var(--about-paper-ink);
  border: 1px solid var(--about-paper-line);
  padding: clamp(22px, 4vw, 48px);
  margin-top: var(--sec);
}

.page-about .band--paper .kicker {
  color: #b4521c;
}

.page-about .band--paper h2 {
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.2vw, 36px);
  line-height: 1.3;
  color: var(--about-paper-ink);
  margin: 0.4em 0 0;
}

.page-about .band__lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-paper-soft);
}

.page-about .cats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
  margin-top: clamp(20px, 3.4vw, 32px);
}

.page-about .cat {
  background: #fbf7ec;
  padding: clamp(16px, 2.6vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .cat__no {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: #b4521c;
}

.page-about .cat__name {
  font-size: 17px;
  font-weight: 600;
  color: var(--about-paper-ink);
  margin: 0;
  line-height: 1.4;
}

.page-about .cat__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-paper-soft);
}

/* ---------- 团队 ---------- */
.page-about .team {
  padding: var(--sec) 0;
}

.page-about .team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
}

.page-about .team__fig {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--night-deep);
}

.page-about .team__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team__fig figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-mute);
  border-top: 1px solid var(--about-line);
}

.page-about .team__body h2 {
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.2vw, 36px);
  line-height: 1.3;
  color: var(--text);
  margin: 0.45em 0 0.7em;
}

.page-about .team__body > p {
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 18px;
}

.page-about .roles {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .roles__item {
  background: var(--stand);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .roles__num {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.8vw, 36px);
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .roles__text strong {
  display: block;
  font-size: 15px;
  color: var(--text);
  margin-bottom: 4px;
}

.page-about .roles__text span {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .team__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
  border-left: 2px solid var(--orange);
  padding-left: 14px;
  margin: 0 0 18px;
}

/* ---------- 规模与节奏 ---------- */
.page-about .scale {
  border-top: 1px solid var(--about-line);
  padding-top: clamp(30px, 5vw, 56px);
  padding-bottom: var(--sec);
}

.page-about .scale__head {
  max-width: 64ch;
  margin-bottom: clamp(22px, 3.6vw, 34px);
}

.page-about .scale__head h2 {
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.2vw, 36px);
  line-height: 1.3;
  color: var(--text);
  margin: 0.45em 0 0;
}

.page-about .scale__head p {
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.8;
  margin: 14px 0 0;
}

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

.page-about .scale__fact {
  background: var(--night);
  padding: clamp(16px, 2.6vw, 24px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: 12px;
  row-gap: 8px;
  min-width: 0;
}

.page-about .scale__num {
  font-family: var(--font-display);
  font-size: clamp(34px, 6.6vw, 52px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .scale__unit {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text-soft);
}

.page-about .scale__fact p {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 收束 ---------- */
.page-about .closer {
  border-top: 1px solid var(--about-line);
  padding-top: clamp(30px, 5vw, 56px);
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-about .closer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
  align-items: start;
}

.page-about .closer__fig {
  margin: 0;
  position: relative;
  border: 1px solid var(--about-line);
  background: var(--night-deep);
}

.page-about .closer__fig::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 43, 38, 0.05), rgba(12, 43, 38, 0.55));
  pointer-events: none;
}

.page-about .closer__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .closer__body h2 {
  font-family: var(--font-serif);
  font-size: clamp(23px, 4.2vw, 36px);
  line-height: 1.3;
  color: var(--text);
  margin: 0 0 0.6em;
}

.page-about .closer__body > p {
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 20px;
}

.page-about .closer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .closer__links li {
  border-bottom: 1px solid var(--about-line);
  padding: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .closer__links a {
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.4vw, 19px);
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--ease), transform var(--ease);
  align-self: flex-start;
}

.page-about .closer__links a:hover {
  color: var(--orange);
  transform: translateX(3px);
}

.page-about .closer__links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .closer__links span {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-mute);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .tl__item {
    padding-left: 82px;
  }

  .page-about .tl__item::before {
    left: 22px;
  }

  .page-about .tl__item::after {
    left: 16px;
  }

  .page-about .tl__ver {
    font-size: 34px;
  }

  .page-about .team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

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

  .page-about .closer__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 1100px) {
  .page-about .cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__node,
  .page-about .tl__hint,
  .page-about .closer__links a {
    transition: none;
  }
}