.page-about {
  --about-gap: clamp(48px, 8vw, 96px);
  --about-hair: rgba(36, 28, 20, 0.14);
  --about-hair-light: rgba(244, 238, 226, 0.16);
  background: var(--paper);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 26px);
}

.page-about h1,
.page-about .about-h2,
.page-about .about-h3 {
  font-family: var(--font-display);
  color: var(--text);
  letter-spacing: -0.02em;
}

.page-about .about-p {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.7vw, 17px);
  line-height: 1.75;
  color: var(--text);
  margin: 0 0 16px;
  max-width: 34em;
}

.page-about .about-inline-link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--ink-deep);
  border-bottom-color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(36px, 5vw, 64px);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -18%;
  width: min(520px, 66vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(11, 26, 43, 0.05), rgba(240, 179, 60, 0.26));
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 74%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-hero h1 {
  font-size: clamp(30px, 7vw, 62px);
  font-weight: 800;
  line-height: 1.08;
  margin: 14px 0 18px;
  max-width: 15em;
}

.page-about .about-hero-lead {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--mist-deep);
  margin: 0 0 26px;
  max-width: 32em;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-plate {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(20px, 3vw, 30px) clamp(18px, 2.6vw, 26px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-plate-label {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 18px;
}

.page-about .about-plate-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-plate-list li {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair-light);
}

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

.page-about .about-plate-num {
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 600;
  color: var(--gold-hi);
  line-height: 1;
}

.page-about .about-plate-num i {
  font-style: normal;
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--gold);
}

.page-about .about-plate-text {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 238, 226, 0.78);
}

/* ---------- 通用分区 ---------- */
.page-about .about-section {
  padding: clamp(44px, 6vw, 82px) 0;
}

.page-about .about-h2 {
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  margin: 10px 0 20px;
  max-width: 20em;
}

.page-about .about-h3 {
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 12px;
}

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

.page-about .about-statement {
  background: var(--paper-2);
  padding: clamp(24px, 3.4vw, 36px);
  border-left: 3px solid var(--gold);
}

.page-about .about-statement-kicker {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist-deep);
  margin: 0 0 14px;
}

.page-about .about-statement-text {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  max-width: 100%;
  filter: saturate(0.92) contrast(1.02);
}

.page-about .about-team-figure figcaption,
.page-about .about-timeline-figure figcaption {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-deep);
  margin-top: 10px;
}

.page-about .about-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-role {
  display: grid;
  gap: 4px;
  padding: 14px 0 14px 16px;
  border-left: 2px solid var(--about-hair);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-role:hover {
  border-left-color: var(--jade);
  background: rgba(46, 158, 126, 0.06);
}

.page-about .about-role-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-role-desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--mist-deep);
}

/* ---------- 索引体系 ---------- */
.page-about .about-index {
  background: linear-gradient(180deg, var(--paper) 0%, rgba(230, 220, 202, 0.55) 100%);
}

.page-about .about-index-head {
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-figures {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 46px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}

.page-about .about-figure {
  display: grid;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-figure-num {
  font-size: clamp(34px, 8vw, 58px);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-figure-num i {
  font-style: normal;
  font-size: 0.45em;
  color: var(--gold);
  margin-left: 2px;
}

.page-about .about-figure-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist-deep);
}

.page-about .about-index-notes {
  gap: clamp(22px, 3.4vw, 36px);
}

.page-about .about-note {
  padding: 22px 0 22px 20px;
  border-left: 3px solid var(--gold);
  background: rgba(244, 238, 226, 0.6);
}

.page-about .about-note--jade {
  border-left-color: var(--jade);
  background: rgba(46, 158, 126, 0.08);
}

.page-about .about-note .about-p {
  margin-bottom: 0;
  font-size: 15px;
}

/* ---------- 时间轴（深色段） ---------- */
.page-about .about-timeline {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(64px, 9vw, 116px) 0;
  clip-path: polygon(0 2.6%, 100% 0, 100% 97.4%, 0 100%);
  margin: clamp(20px, 4vw, 40px) 0;
}

.page-about .about-timeline h2,
.page-about .about-timeline h3 {
  color: var(--paper);
}

.page-about .about-h2--on-dark {
  color: var(--paper);
}

.page-about .about-p--on-dark {
  color: rgba(244, 238, 226, 0.76);
}

.page-about .eyebrow--on-dark {
  color: var(--gold);
}

.page-about .about-timeline-figure {
  margin: clamp(26px, 4vw, 44px) 0 clamp(30px, 4vw, 48px);
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 25 / 14;
  object-fit: cover;
  max-width: 100%;
  border: 1px solid var(--about-hair-light);
  filter: saturate(0.9);
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-stage {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--about-hair-light);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 1px solid var(--gold);
  transition: background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-stage:hover::before,
.page-about .about-stage:focus-within::before {
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(240, 179, 60, 0.18);
}

.page-about .about-stage-year {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin: 0 0 8px;
}

.page-about .about-stage-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-stage-summary {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 238, 226, 0.62);
  margin: 0;
  transition: color 0.2s var(--ease);
}

.page-about .about-stage:hover .about-stage-summary {
  color: var(--gold-hi);
}

/* ---------- 协作 ---------- */
.page-about .about-coop-banner {
  margin: 0 0 clamp(26px, 4vw, 44px);
  position: relative;
}

.page-about .about-coop-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  max-width: 100%;
  filter: saturate(0.7) contrast(1.05);
}

.page-about .about-coop-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-coop-item {
  display: grid;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-coop-item .badge {
  justify-self: start;
}

.page-about .about-coop-desc {
  font-size: 15px;
  line-height: 1.68;
  color: var(--mist-deep);
}

.page-about .about-contact {
  background: var(--paper-2);
  padding: clamp(22px, 3.2vw, 32px);
  border-top: 3px solid var(--ink);
}

.page-about .about-contact-kicker {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist-deep);
  margin: 0 0 12px;
}

.page-about .about-contact-lead {
  font-size: 15px;
}

.page-about .about-contact-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-contact-list li {
  display: grid;
  gap: 3px;
}

.page-about .about-contact-key {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist-deep);
}

.page-about .about-contact-val {
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-about .about-contact .btn {
  display: inline-block;
}

.page-about .about-totop {
  margin: clamp(30px, 4vw, 46px) 0 0;
  text-align: right;
}

.page-about .about-totop-link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
}

.page-about .about-totop-link:hover,
.page-about .about-totop-link:focus-visible {
  color: var(--ink-deep);
  border-bottom-color: var(--ink);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-index-notes {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.75fr);
  }

  .page-about .about-stages {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
    padding-top: 26px;
    position: relative;
  }

  .page-about .about-stages::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 5px;
    height: 1px;
    background: linear-gradient(90deg, rgba(244, 238, 226, 0.12), rgba(240, 179, 60, 0.5), rgba(244, 238, 226, 0.12));
  }

  .page-about .about-stage {
    padding-left: 0;
    padding-top: 8px;
    border-left: 0;
  }

  .page-about .about-stage::before {
    left: 0;
    top: -26px;
  }

  .page-about .about-coop-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .about-hero h1 {
    max-width: 13em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-stage::before,
  .page-about .about-stage-summary {
    transition: none;
  }
}