.page-about {
  --about-line: rgba(192, 138, 74, 0.16);
  --about-line-strong: rgba(192, 138, 74, 0.34);
  --about-celadon-glow: rgba(127, 169, 155, 0.18);
  background-color: var(--ink-900);
  color: var(--ivory);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 30px);
}
.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ivory-40);
}
.page-about .crumbs__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .crumbs__list li + li::before {
  content: "/";
  color: var(--copper-45);
}
.page-about .crumbs__list a {
  color: var(--ivory-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .crumbs__list a:hover,
.page-about .crumbs__list a:focus-visible {
  color: var(--copper-lite);
  border-bottom-color: var(--copper-45);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(26px, 4vw, 56px) clamp(40px, 6vw, 88px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7vw, 78px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ivory);
}
.page-about .about-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ivory-70);
}
.page-about .about-hero__marks {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-hero__marks li {
  padding-top: 10px;
  border-top: 1px solid var(--about-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ivory-56);
}
.page-about .about-hero__marks span {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--copper);
}
.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ivory-40);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 通用章节 */
.page-about .about-split,
.page-about .op-split,
.page-about .team-split {
  display: grid;
  gap: clamp(24px, 3.6vw, 48px);
}
.page-about .about-head {
  max-width: 68ch;
}
.page-about .about-head h2 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ivory);
}
.page-about .about-head p {
  margin: 0;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.85;
  color: var(--ivory-70);
}
.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.9;
  color: var(--ivory-70);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* 引言块 */
.page-about .about-quote {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: clamp(18px, 2.6vw, 28px);
  border-left: 2px solid var(--copper);
  background: linear-gradient(90deg, var(--copper-08), rgba(192, 138, 74, 0) 72%);
}
.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.8vw, 30px);
  line-height: 1.45;
  color: var(--ivory);
}
.page-about .about-quote cite {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--copper);
}

/* 宽幅章节 */
.page-about .about-band {
  background-color: var(--ink-800);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .ritual {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 44px);
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .ritual__item {
  padding: clamp(20px, 3vw, 30px);
  background-color: var(--ink-700);
  transition: background-color var(--dur) var(--ease);
}
.page-about .ritual__item:hover {
  background-color: var(--ink-600);
}
.page-about .ritual__idx {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 8px;
  border: 1px solid var(--copper-45);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--copper-lite);
}
.page-about .ritual__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ivory);
}
.page-about .ritual__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ivory-70);
}

/* 数据铭牌 */
.page-about .plaque-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 42px);
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .plaque {
  padding: clamp(18px, 2.6vw, 26px);
  background-color: var(--ink-800);
  transition: background-color var(--dur) var(--ease);
}
.page-about .plaque:hover,
.page-about .plaque:focus-within {
  background-color: var(--ink-700);
}
.page-about .plaque__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--copper-lite);
}
.page-about .plaque__num small {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--copper);
}
.page-about .plaque__label {
  margin: 12px 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .plaque__note {
  margin: 6px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ivory-40);
}

/* 场景 */
.page-about .scene-list {
  display: grid;
  gap: 18px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .scene {
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}
.page-about .scene h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--copper-lite);
}
.page-about .scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ivory-56);
}

/* 运营流程 */
.page-about .op-steps {
  border-bottom: 1px solid var(--about-line);
}
.page-about .op-step {
  border-top: 1px solid var(--about-line);
}
.page-about .op-step summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .op-step summary::-webkit-details-marker {
  display: none;
}
.page-about .op-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--copper);
  transition: color var(--dur) var(--ease);
}
.page-about .op-step[open] summary::after {
  content: "–";
  color: var(--celadon);
}
.page-about .op-step__idx {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--copper);
}
.page-about .op-step__title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ivory);
  transition: color var(--dur) var(--ease);
}
.page-about .op-step[open] .op-step__title,
.page-about .op-step summary:hover .op-step__title {
  color: var(--copper-lite);
}
.page-about .op-step summary:focus-visible {
  outline: 1px solid var(--copper-45);
  outline-offset: 4px;
}
.page-about .op-step__body {
  margin: 0;
  padding: 0 0 20px 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ivory-70);
}

/* 配图 */
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure__caption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ivory-40);
}

/* 时间轴 */
.page-about .timeline {
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .timeline__item {
  position: relative;
  margin-left: 5px;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--about-line-strong);
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 4px;
  left: -5px;
  width: 9px;
  height: 9px;
  background-color: var(--ink-900);
  border: 1px solid var(--copper);
  transform: rotate(45deg);
}
.page-about .timeline__item:last-child::before {
  border-color: var(--celadon);
  background-color: var(--ink-900);
}
.page-about .timeline__year {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--copper);
}
.page-about .timeline__card {
  padding: clamp(16px, 2.4vw, 24px);
  border-color: var(--about-line);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .timeline__card:hover {
  border-color: var(--copper-45);
  transform: translateY(-2px);
}
.page-about .timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ivory);
}
.page-about .timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ivory-70);
}

/* 团队 */
.page-about .team-group {
  margin-bottom: 12px;
  border: 1px solid var(--about-line);
  background-color: var(--ink-800);
}
.page-about .team-group summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .team-group summary::-webkit-details-marker {
  display: none;
}
.page-about .team-group summary:focus-visible {
  outline: 1px solid var(--copper-45);
  outline-offset: 2px;
}
.page-about .team-group__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--ivory-40);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .team-group[open] .team-group__dot {
  background-color: var(--celadon);
  box-shadow: 0 0 0 4px var(--about-celadon-glow);
}
.page-about .team-group__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ivory);
}
.page-about .team-group__tag {
  margin-left: auto;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--ivory-40);
}
.page-about .team-group[open] .team-group__tag {
  color: var(--celadon);
}
.page-about .team-group p {
  margin: 0;
  padding: 0 16px 18px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ivory-70);
}
.page-about .partner-row {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .partner {
  padding-left: 16px;
  border-left: 2px solid var(--copper);
}
.page-about .partner__num {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--copper-lite);
}
.page-about .partner__text {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ivory-56);
}
.page-about .about-diagram {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin-top: 18px;
  color: var(--copper-45);
}

/* 收束 */
.page-about .about-cta {
  padding-block: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--about-line);
  background:
    radial-gradient(120% 150% at 10% 0%, var(--copper-16), rgba(192, 138, 74, 0) 58%),
    var(--ink-900);
}
.page-about .about-cta h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 48px);
  line-height: 1.2;
  color: var(--ivory);
}
.page-about .about-cta__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ivory-56);
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .about-cta__links .btn {
  flex: 0 1 auto;
}

/* 断点 */
@media (min-width: 600px) {
  .page-about .plaque-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .scene-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 28px;
  }
  .page-about .partner-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .ritual {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(32px, 4vw, 72px);
  }
  .page-about .op-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
  .page-about .team-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 4vw, 68px);
  }
  .page-about .about-hero__figure {
    position: sticky;
    top: 24px;
  }
}

@media (min-width: 1000px) {
  .page-about .plaque-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card:hover {
    transform: none;
  }
  .page-about .timeline__card,
  .page-about .plaque,
  .page-about .ritual__item,
  .page-about .team-group__dot,
  .page-about .op-step__title {
    transition: none;
  }
}