.page-about {
  --about-rail: 188px;
  --about-ink-soft: rgba(232, 238, 247, 0.78);
  --about-cream-soft: rgba(28, 23, 18, 0.78);
  background: var(--void);
  color: var(--white);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
  text-transform: uppercase;
}

.page-about .section-head {
  max-width: 720px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .section-head h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .section-lede {
  margin: 0;
  color: var(--about-ink-soft);
  font-size: 15.5px;
  line-height: 1.75;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 20px 0 clamp(48px, 7vw, 80px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.32;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at 70% 20%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 70% 20%, #000 0%, transparent 72%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(22px, 4vw, 36px);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grid);
}

.page-about .crumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .crumb-link {
  color: var(--grid);
  text-decoration: none;
}

.page-about .crumb-link:hover,
.page-about .crumb-link:focus-visible {
  color: var(--signal);
}

.page-about .crumb-current {
  color: var(--white);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: var(--white);
  max-width: 16ch;
}

.page-about .hero-lede {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-visual {
  display: grid;
  gap: 14px;
}

.page-about .range-plate {
  display: flex;
  align-items: baseline;
  gap: clamp(8px, 2vw, 18px);
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 0.85;
  letter-spacing: -0.045em;
}

.page-about .range-from {
  font-size: clamp(48px, 11vw, 104px);
  color: var(--white);
}

.page-about .range-arrow {
  font-size: clamp(22px, 4vw, 40px);
  color: var(--signal);
}

.page-about .range-to {
  font-size: clamp(48px, 11vw, 104px);
  color: transparent;
  -webkit-text-stroke: 1.5px var(--signal);
}

.page-about .hero-figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--console);
  aspect-ratio: 1400 / 800;
  overflow: hidden;
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 5vw, 48px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-cell {
  background: var(--void);
  padding: 16px 18px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--signal);
}

.page-about .stat-unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--white);
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grid);
}

/* 时间轴 */
.page-about .about-timeline {
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .timeline-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .year-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-about .rail-label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--grid);
  text-transform: uppercase;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--grid);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .rail-link::before {
  content: "";
  width: 16px;
  height: 1px;
  background: currentColor;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--signal);
}

.page-about .year-stream {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .year-block {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  background: var(--console);
  border: 1px solid var(--line);
  border-left: 3px solid var(--signal);
}

.page-about .year-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
}

.page-about .year-mark .num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .year-block h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.35;
  color: var(--white);
}

.page-about .year-block p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .year-tags,
.page-about .panel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ytag {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  padding: 4px 8px;
  border: 1px solid var(--line-strong);
  color: var(--grid);
}

.page-about .ytag--signal {
  border-color: var(--signal);
  color: var(--signal);
}

.page-about .ytag--green {
  border-color: var(--green);
  color: var(--green);
}

.page-about .ytag--amber {
  border-color: var(--amber);
  color: var(--amber);
}

/* 版本对照 */
.page-about .about-versions {
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .version-layout {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .tab {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--white);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .tab:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.page-about .tab[aria-selected="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--void);
}

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

.page-about .tab-panel {
  padding-top: 22px;
}

.page-about .tab-panel h3 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.3;
  color: var(--white);
}

.page-about .tab-panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .version-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--console);
}

.page-about .version-figure img {
  display: block;
  width: 100%;
}

.page-about .version-figure figcaption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--grid);
  border-top: 1px solid var(--line);
}

/* 奶油底区段 */
.page-about .band-cream {
  background: var(--cream);
  color: var(--ink);
}

.page-about .band-cream .section-head h2 {
  color: var(--ink);
}

.page-about .band-cream .section-lede {
  color: var(--about-cream-soft);
}

.page-about .about-team {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .team-intro {
  display: grid;
  gap: clamp(24px, 4vw, 36px);
}

.page-about .team-intro h2 {
  margin: 0 0 14px;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .team-intro p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-cream-soft);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid rgba(28, 23, 18, 0.18);
  background: var(--ink);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
}

.page-about .role-matrix {
  display: grid;
  gap: 1px;
  list-style: none;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  background: rgba(28, 23, 18, 0.18);
  border: 1px solid rgba(28, 23, 18, 0.18);
}

.page-about .role-card {
  background: var(--cream);
  padding: 22px;
  transition: background 0.18s ease;
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  background: #FFF9EF;
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .role-card h3 {
  margin: 8px 0;
  font-size: 17px;
  color: var(--ink);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-cream-soft);
}

/* 发布节奏 */
.page-about .about-rhythm {
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .rhythm-row {
  display: grid;
  gap: 8px;
  padding: 20px;
  background: var(--void);
}

.page-about .rhythm-time {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .rhythm-row h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--white);
}

.page-about .rhythm-row p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

.page-about .rhythm-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--grid);
}

.page-about .live-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(61, 220, 132, 0.16);
}

/* 内容习惯 */
.page-about .about-principles {
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .principle-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .principle {
  padding: 24px;
  background: var(--console);
  border-top: 2px solid transparent;
  transition: border-color 0.18s ease;
}

.page-about .principle:hover {
  border-top-color: var(--signal);
}

.page-about .p-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .principle h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  color: var(--white);
}

.page-about .principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .serve-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 24px;
  padding: 16px 20px;
  border: 1px dashed var(--line-strong);
  font-size: 14px;
  color: var(--about-ink-soft);
}

.page-about .serve-strip strong {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green);
  font-weight: 700;
}

/* 里程碑 */
.page-about .about-milestones {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .milestone-list {
  display: grid;
  gap: 10px;
}

.page-about .fold {
  border: 1px solid rgba(28, 23, 18, 0.2);
  background: #FFF9EF;
}

.page-about .fold summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  list-style: none;
}

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

.page-about .fold summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--signal);
  font-size: 16px;
}

.page-about .fold[open] summary::after {
  content: "−";
}

.page-about .fold-year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}

.page-about .fold-body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-cream-soft);
}

.page-about .recognition {
  margin-top: 28px;
  padding: 24px;
  background: var(--ink);
  color: var(--cream);
}

.page-about .recog-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .recognition p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 235, 221, 0.82);
}

.page-about .recognition p + p {
  margin-top: 10px;
}

/* 结尾引导 */
.page-about .about-cta {
  padding: clamp(40px, 7vw, 72px) 0;
  background: var(--signal);
  color: var(--ink);
}

.page-about .cta-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta .eyebrow {
  color: var(--ink);
  opacity: 0.72;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(28, 23, 18, 0.82);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta .btn {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

.page-about .about-cta .btn:hover,
.page-about .about-cta .btn:focus-visible {
  background: var(--console);
  border-color: var(--console);
  color: var(--white);
}

@media (min-width: 700px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 800px) {
  .page-about .rhythm-row {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 24px;
    padding: 24px 28px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }

  .page-about .timeline-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .rail-list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .rail-link {
    width: 100%;
  }

  .page-about .team-intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .version-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
  }

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

@media (min-width: 1040px) {
  .page-about .role-matrix {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tab,
  .page-about .role-card,
  .page-about .principle {
    transition: none;
  }
}
<<<END>>>