.page-about {
  --about-hair: rgba(217, 202, 179, 0.2);
  --about-hair-soft: rgba(217, 202, 179, 0.12);
  --about-glow: rgba(201, 162, 91, 0.16);
  --about-glass: rgba(16, 27, 51, 0.62);
  --about-body-text: rgba(242, 244, 248, 0.8);
  --about-night: linear-gradient(158deg, rgba(30, 58, 95, 0.56), rgba(11, 18, 32, 0.05) 68%);
  color: var(--paper);
}

.page-about .about-wrap {
  padding-block: 18px 84px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  margin-top: 20px;
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 7vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-body-text);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero-side {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-map {
  padding: 20px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--about-glass);
  backdrop-filter: blur(14px);
  box-shadow: inset 0 1px 0 rgba(242, 244, 248, 0.06);
}

.page-about .about-map-title {
  margin: 0 0 8px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

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

.page-about .about-map-list li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 4px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--about-hair-soft);
}

.page-about .about-map-list li:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .about-map-num {
  font-family: var(--font-index);
  font-size: 11px;
  color: var(--gold);
  padding-top: 3px;
}

.page-about .about-map-text {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 400;
  color: var(--paper);
}

.page-about .about-map-text em {
  display: block;
  margin-top: 3px;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-map-note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--about-hair-soft);
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--coral);
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ---------- 主栅格与阶段索引 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 34px;
  margin-top: 48px;
}

.page-about .about-rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--about-hair-soft);
  border-radius: 999px;
  background: rgba(16, 27, 51, 0.45);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}

.page-about .about-rail-num {
  font-family: var(--font-index);
  font-size: 10.5px;
  color: var(--gold);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--paper);
  border-color: rgba(201, 162, 91, 0.5);
}

.page-about .about-rail-link[aria-current="true"] {
  color: var(--paper);
  background: var(--about-glow);
  border-color: rgba(201, 162, 91, 0.65);
}

.page-about .about-rail-foot {
  margin: 12px 0 0;
  font-family: var(--font-body);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 22ch;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-bottom: 52px;
  scroll-margin-top: 84px;
}

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

.page-about .about-section .section-index {
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-section .section-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section .section-note {
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-figure {
  margin: 0 0 26px;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.page-about .about-figcap {
  margin: 8px 0 0;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.page-about .about-quote {
  padding: 24px 22px;
  border-radius: var(--radius);
  background: var(--cream);
  color: var(--brown);
  box-shadow: 0 18px 40px -32px rgba(0, 0, 0, 0.9);
}

.page-about .about-quote-lead {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  line-height: 1.62;
  color: var(--brown);
}

.page-about .about-quote p {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.9;
}

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

.page-about .about-aside {
  padding-left: 16px;
  border-left: 2px solid var(--coral);
}

.page-about .about-aside-label {
  margin: 0 0 8px;
  font-family: var(--font-index);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--coral);
}

.page-about .about-aside-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .about-aside-mark {
  margin: 10px 0 0;
  font-family: var(--font-index);
  font-size: 11px;
  color: var(--mist);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline {
  margin: 6px 0 0 6px;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-stage {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 91, 0.12);
}

.page-about .about-stage-num {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-stage h3 {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.14rem;
  color: var(--paper);
}

.page-about .about-stage p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.88;
  color: var(--about-body-text);
}

/* ---------- 03 团队 Bento ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  padding: 18px 18px 16px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--about-glass);
  backdrop-filter: blur(12px);
}

.page-about .about-team-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1rem;
}

.page-about .about-team-trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-team-trigger:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

.page-about .about-team-num {
  font-family: var(--font-index);
  font-size: 10.5px;
  color: var(--gold);
}

.page-about .about-team-label {
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-about .about-team-count {
  margin-left: auto;
}

.page-about .about-team-desc {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-team-list {
  margin: 0;
  padding: 0 0 0 16px;
  list-style: none;
}

.page-about .about-team-list li {
  position: relative;
  padding-left: 12px;
  margin-bottom: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--coral);
}

.page-about .about-team-list li:last-child {
  margin-bottom: 0;
}

.page-about .about-team-card .disclosure-panel {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--about-hair-soft);
}

.page-about .about-team-card .disclosure-icon {
  width: 12px;
  height: 12px;
  margin-left: 4px;
  border-right: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
  transform: rotate(45deg);
  transition: transform 200ms ease;
}

.page-about .about-team-card .disclosure-item[data-open="true"] .disclosure-icon {
  transform: rotate(-135deg);
}

/* ---------- 04 规模 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 22px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--about-hair-soft);
}

.page-about .about-stat {
  padding: 18px 16px;
  background: rgba(16, 27, 51, 0.92);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1.85rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 7px;
  font-family: var(--font-body);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-scale-notes p {
  margin: 0 0 12px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-body-text);
}

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

/* ---------- 05 伙伴 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .about-partners-lede {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-body-text);
}

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

.page-about .about-partner-list li {
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--about-hair-soft);
}

.page-about .about-partner-list p {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-honors {
  margin-top: 20px;
  padding: 18px;
  border-left: 2px solid var(--gold);
  background: var(--about-night);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-honors-title {
  margin: 0 0 8px;
  font-family: var(--font-index);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-honors-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .about-partners-figure {
  margin: 0;
}

/* ---------- 06 承诺 ---------- */
.page-about .about-promise {
  padding: 26px 22px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--about-night);
}

.page-about .about-promise-text {
  margin: 14px 0 0;
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--about-body-text);
}

.page-about .about-promise-sign {
  margin: 16px 0 0;
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--sand);
}

.page-about .about-promise-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-foot {
  display: flex;
  justify-content: flex-end;
  margin-top: 26px;
}

.page-about .about-foot .to-top {
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-team-card:nth-child(1) {
    grid-column: span 3;
  }

  .page-about .about-team-card:nth-child(2) {
    grid-column: span 3;
  }

  .page-about .about-team-card:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .about-team-card:nth-child(4) {
    grid-column: span 4;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
    align-items: end;
    gap: 40px;
    margin-top: 28px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.5fr) minmax(230px, 0.8fr);
    align-items: start;
    gap: 28px;
  }

  .page-about .about-quote {
    padding: 30px 28px;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
    align-items: start;
    gap: 30px;
  }

  .page-about .about-promise {
    padding: 34px 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-wrap {
    padding-block: 22px 104px;
  }

  .page-about .about-shell {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 48px;
    margin-top: 62px;
  }

  .page-about .about-rail-inner {
    position: sticky;
    top: 32px;
  }

  .page-about .about-rail-list {
    display: block;
  }

  .page-about .about-rail-list li {
    margin-bottom: 2px;
  }

  .page-about .about-rail-link {
    display: flex;
    width: 100%;
    padding: 8px 10px 8px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 8px 8px 0;
    background: transparent;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    background: rgba(16, 27, 51, 0.55);
  }

  .page-about .about-rail-link[aria-current="true"] {
    border-left-color: var(--gold);
    background: var(--about-glow);
  }

  .page-about .about-rail-foot {
    max-width: none;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--about-hair-soft);
  }
}