.page-about {
  background: var(--ink);
  color: var(--chalk);
  --about-paper-ink: var(--brown);
  --about-step-gap: var(--sp-4);
}

.page-about .about-crumb-row {
  padding-top: var(--sp-5);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .breadcrumb a {
  color: var(--grey);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--sp-2);
  color: var(--line-strong);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--sp-5) var(--sp-7);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(ellipse at 28% 18%, #000 8%, transparent 70%);
  mask-image: radial-gradient(ellipse at 28% 18%, #000 8%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-hero-copy .h1 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(38px, 7.4vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .about-hero-copy .h1 em {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero-copy .lede {
  margin-top: var(--sp-4);
  max-width: 60ch;
  color: var(--grey);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.page-about .about-hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-3);
  margin: var(--sp-5) 0 0;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line);
}

.page-about .about-hero-figures div {
  display: flex;
  flex-direction: column-reverse;
  gap: 2px;
}

.page-about .about-hero-figures dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .about-hero-figures dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero-figure .media-frame {
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
}

.page-about .about-hero-figure figcaption {
  margin-top: var(--sp-3);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

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

/* ---------- 品牌宣言 ---------- */

.page-about .about-declaration {
  background: var(--paper);
  color: var(--about-paper-ink);
}

.page-about .about-frame {
  position: relative;
  border: 1px solid var(--brown);
  outline: 1px solid rgba(42, 31, 26, 0.28);
  outline-offset: 6px;
  padding: clamp(24px, 5vw, 56px);
}

.page-about .about-frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: clamp(24px, 5vw, 56px);
  width: 56px;
  height: 4px;
  background: var(--red);
}

.page-about .about-declaration .eyebrow {
  color: var(--red);
}

.page-about .about-declaration .h2 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1.18;
  color: var(--brown);
}

.page-about .about-declaration-cols {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
}

.page-about .about-declaration-cols p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(42, 31, 26, 0.86);
}

.page-about .about-declaration-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin: var(--sp-5) 0 0;
  padding: var(--sp-4) 0 0;
  border-top: 1px solid rgba(42, 31, 26, 0.22);
  list-style: none;
}

.page-about .about-declaration-tags li {
  padding: 6px 12px;
  border: 1px solid rgba(42, 31, 26, 0.4);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--brown);
}

/* ---------- 发展历程 ---------- */

.page-about .about-section-head {
  max-width: 720px;
}

.page-about .about-section-head .h2 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.14;
}

.page-about .about-section-lede {
  margin: var(--sp-3) 0 0;
  max-width: 58ch;
  color: var(--grey);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-timeline {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.page-about .about-years {
  display: flex;
  gap: var(--sp-3);
  overflow-x: auto;
  padding-bottom: var(--sp-2);
  scrollbar-width: thin;
}

.page-about .about-years a {
  flex: 0 0 auto;
  padding: 6px 0 6px 12px;
  border-left: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  color: var(--lime);
  border-left-color: var(--lime);
}

.page-about .about-stage {
  --stage-fg: var(--chalk);
  --stage-sub: var(--grey);
  --stage-bg: rgba(16, 23, 21, 0.72);
  --stage-accent: var(--orange);
  --stage-line: var(--line);
  margin-bottom: -1px;
  border: 1px solid var(--stage-line);
  border-left: 3px solid var(--stage-accent);
  background: var(--stage-bg);
  color: var(--stage-fg);
  transition: background 0.25s ease, color 0.25s ease;
}

.page-about .about-stage[open] {
  --stage-fg: var(--brown);
  --stage-sub: rgba(42, 31, 26, 0.72);
  --stage-bg: var(--paper);
  --stage-accent: var(--red);
  --stage-line: rgba(42, 31, 26, 0.3);
}

.page-about .about-stage summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-stage-year {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stage-accent);
}

.page-about .about-stage-title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 600;
  line-height: 1.3;
}

.page-about .about-stage-mark {
  position: relative;
  width: 16px;
  height: 16px;
}

.page-about .about-stage-mark::before,
.page-about .about-stage-mark::after {
  content: "";
  position: absolute;
  background: var(--stage-accent);
  transition: transform 0.2s ease;
}

.page-about .about-stage-mark::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
}

.page-about .about-stage-mark::after {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
}

.page-about .about-stage[open] .about-stage-mark::after {
  transform: scaleY(0);
}

.page-about .about-stage-body {
  padding: 0 var(--sp-4) var(--sp-4);
  border-top: 1px dashed var(--stage-line);
  padding-top: var(--sp-3);
}

.page-about .about-stage-body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stage-sub);
}

.page-about .about-stage-points {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-4);
  margin: var(--sp-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stage-points li {
  position: relative;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stage-sub);
}

.page-about .about-stage-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 1px;
  background: var(--stage-accent);
}

/* ---------- 内容生产 ---------- */

.page-about .about-process {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-process-top {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-process-top .h2 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.14;
}

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

.page-about .about-process-figure .media-frame {
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-process-figure figcaption {
  margin-top: var(--sp-3);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .about-steps {
  display: grid;
  gap: var(--about-step-gap);
  margin: var(--sp-6) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: about-step;
}

.page-about .about-steps li {
  position: relative;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line);
}

.page-about .about-steps li::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 30px;
  height: 1px;
  background: var(--lime);
}

.page-about .about-step-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-step-title {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .about-steps p {
  margin: var(--sp-2) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 团队与协作 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: var(--sp-5);
  align-items: start;
}

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

.page-about .about-team-figure .media-frame {
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
}

.page-about .about-team-figure figcaption {
  margin-top: var(--sp-3);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .about-team-copy .h2 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.14;
}

.page-about .about-team-copy > p {
  margin: var(--sp-3) 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-team-roster {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-3);
  margin: var(--sp-5) 0 0;
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-roster dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grey);
}

.page-about .about-team-roster dd {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team-sub {
  margin: var(--sp-5) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-team-copy .about-team-sub + p {
  margin-top: var(--sp-2);
}

/* ---------- 覆盖与认可 ---------- */

.page-about .about-coverage {
  background: var(--paper);
  color: var(--about-paper-ink);
}

.page-about .about-coverage .eyebrow {
  color: var(--red);
}

.page-about .about-coverage .h2 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(28px, 4.6vw, 46px);
  line-height: 1.14;
  color: var(--brown);
}

.page-about .about-coverage-grid {
  display: grid;
  gap: var(--sp-5);
  margin-top: var(--sp-5);
}

.page-about .about-coverage-block h3 {
  margin: 0;
  padding-bottom: var(--sp-2);
  border-bottom: 2px solid var(--brown);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--brown);
}

.page-about .about-coverage-list {
  margin: var(--sp-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coverage-list li {
  padding: var(--sp-3) 0;
  border-bottom: 1px solid rgba(42, 31, 26, 0.18);
}

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

.page-about .about-coverage-list span.mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-coverage-list p {
  margin: var(--sp-2) 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(42, 31, 26, 0.86);
}

.page-about .about-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin: var(--sp-4) 0 0;
}

.page-about .about-badge {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--brown);
  background: rgba(42, 31, 26, 0.05);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--brown);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .about-cta-inner {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-cta-inner .h2 {
  margin: var(--sp-3) 0 0;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.16;
}

.page-about .about-cta-note {
  margin: var(--sp-3) 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
}

.page-about .about-cta-back {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.page-about .about-cta-back:hover,
.page-about .about-cta-back:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--sp-4);
  }

  .page-about .about-declaration-cols {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-5);
  }

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

  .page-about .about-coverage-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-6);
  }

  .page-about .about-cta-inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
  }

  .page-about .about-team-roster {
    gap: var(--sp-4);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-block: var(--sp-6) var(--sp-7);
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: end;
    gap: var(--sp-6);
  }

  .page-about .about-hero-figure::before {
    content: "";
    position: absolute;
    inset: 12px -12px -12px 12px;
    border: 1px solid var(--orange);
    opacity: 0.5;
    pointer-events: none;
  }

  .page-about .about-timeline {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: var(--sp-6);
  }

  .page-about .about-years {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-years a {
    padding: 8px 0 8px 16px;
    font-size: 13px;
  }

  .page-about .about-process-top {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
    gap: var(--sp-6);
  }

  .page-about .about-team-grid {
    grid-template-columns: 0.82fr 1.18fr;
    gap: var(--sp-6);
  }
}

@media (min-width: 1080px) {
  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--sp-3);
  }

  .page-about .about-step-title {
    font-size: 17px;
  }
}

@media (max-width: 640px) {
  .page-about .about-hero-figure::before {
    display: none;
  }

  .page-about .about-hero-figures dd {
    font-size: 24px;
  }

  .page-about .about-team-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-2);
  }

  .page-about .about-team-roster dd {
    font-size: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-stage-mark::before,
  .page-about .about-stage-mark::after,
  .page-about .about-years a {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>