.page-about {
  --tl-year: 64px;
  --tl-dot: 20px;
  --tl-gap: 10px;
  background: var(--bg);
  color: var(--text);
}

.page-about [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 600ms ease-out, transform 600ms ease-out, border-color var(--transition), box-shadow var(--transition);
}

.page-about [data-reveal="in"] {
  opacity: 1;
  transform: none;
}

/* ---------- Hero 首屏 ---------- */
.page-about__hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 180px 0 88px;
  background: var(--bg);
  overflow: hidden;
}

.page-about__hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about__hero-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.14;
}

.page-about__hero .container {
  position: relative;
  z-index: 1;
}

.page-about__crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 56px;
}

.page-about__crumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about__crumb a:hover {
  color: var(--gold);
}

.page-about__crumb-current {
  color: var(--text);
}

.page-about__hero-content {
  margin-bottom: 48px;
}

.page-about__hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 24px;
}

.page-about__hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.75rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
}

.page-about__hero-accent {
  color: var(--gold);
}

.page-about__hero-lead {
  max-width: 520px;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--muted);
  margin: 0;
}

.page-about__hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.page-about__hero-index a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--line);
  padding: 8px 14px;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.page-about__hero-index a span {
  color: var(--gold);
  font-size: 0.75rem;
}

.page-about__hero-index a:hover {
  border-color: var(--line-gold);
  color: var(--gold);
  background: var(--bg-raised);
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 32px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--muted);
}

.page-about__hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about__hero-meta span::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--gold);
  flex-shrink: 0;
}

/* ---------- Origin 起点 ---------- */
.page-about__origin {
  padding: 120px 0;
  border-bottom: 1px solid var(--line);
}

.page-about__origin-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: start;
}

.page-about__origin h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  margin: 0 0 32px;
}

.page-about__origin-lead {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--gold);
  margin: 0 0 24px;
}

.page-about__origin-copy p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.95;
  color: var(--muted);
  margin: 0 0 16px;
}

.page-about__origin-copy p:last-child {
  margin-bottom: 0;
}

.page-about__origin-quote {
  margin: 0;
  padding: 36px 32px;
  background: var(--bg-raised);
  border-left: 3px solid var(--gold);
  position: relative;
}

.page-about__origin-quote-mark {
  display: block;
  font-family: var(--font-heading);
  font-size: 4.5rem;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about__origin-quote p {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
  margin: 0;
}

.page-about__origin-quote-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--muted);
  margin-top: 24px;
}

/* ---------- Timeline 时间轴 ---------- */
.page-about__timeline {
  padding: 120px 0;
  background: var(--bg-raised);
}

.page-about__timeline-head {
  max-width: 560px;
  margin-bottom: 64px;
}

.page-about__timeline-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  margin: 0 0 20px;
}

.page-about__timeline-intro {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
}

.page-about__timeline-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}

.page-about__timeline-main {
  position: relative;
}

.page-about__timeline-line {
  position: absolute;
  left: calc(var(--tl-year) + var(--tl-gap));
  transform: translateX(calc(var(--tl-dot) / 2 - 0.5px));
  top: 12px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-gold), var(--line));
}

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

.page-about__tl-item {
  display: grid;
  grid-template-columns: var(--tl-year) var(--tl-dot) 1fr;
  gap: var(--tl-gap);
  align-items: start;
  padding-bottom: 44px;
}

.page-about__tl-item:last-child {
  padding-bottom: 0;
}

.page-about__tl-year {
  font-family: var(--font-mono);
  font-size: 1.1875rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--gold);
  text-align: right;
  padding-top: 4px;
  transition: color var(--transition);
}

.page-about__tl-dot {
  width: var(--tl-dot);
  height: var(--tl-dot);
  border-radius: 50%;
  background: var(--red);
  border: 3px solid var(--bg-raised);
  margin-top: 8px;
  z-index: 1;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about__tl-content {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 18px 20px;
  transition: border-color var(--transition), background var(--transition);
}

.page-about__tl-content h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 8px;
}

.page-about__tl-content p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}

.page-about__tl-item:hover .page-about__tl-dot {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px rgba(232, 181, 74, 0.35);
}

.page-about__tl-item:hover .page-about__tl-year {
  color: var(--text);
}

.page-about__tl-item:hover .page-about__tl-content {
  border-color: var(--line-gold);
  background: var(--bg-over);
}

.page-about__timeline-figure {
  margin: 0;
}

.page-about__timeline-figure img,
.page-about__scale-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- Philosophy 理念 ---------- */
.page-about__philosophy {
  padding: 120px 0;
}

.page-about__philosophy-inner {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.page-about__philosophy h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 900;
  margin: 0 0 24px;
}

.page-about__philosophy-lead {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--gold);
  margin: 0 0 20px;
}

.page-about__philosophy-text {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.95;
  color: var(--muted);
  margin: 0 0 48px;
}

.page-about__philosophy-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  text-align: left;
}

.page-about__philosophy-list li {
  background: var(--bg-raised);
  border-top: 2px solid var(--gold);
  padding: 28px 24px;
  transition: background var(--transition), border-color var(--transition);
}

.page-about__philosophy-list li:hover {
  background: var(--bg-over);
}

.page-about__philosophy-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
  margin-bottom: 16px;
}

.page-about__philosophy-list h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 8px;
}

.page-about__philosophy-list p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}

/* ---------- Scale 规模 ---------- */
.page-about__scale {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg), var(--bg-raised));
}

.page-about__scale-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about__scale h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  margin: 0 0 20px;
}

.page-about__scale-intro {
  max-width: 440px;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 32px;
}

.page-about__scale-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about__scale-item {
  background: var(--bg);
  padding: 26px 22px;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about__scale-item[data-reveal="in"] {
  border-color: var(--line-gold);
  box-shadow: 0 0 20px rgba(232, 181, 74, 0.14);
}

.page-about__scale-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.375rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 10px;
}

.page-about__scale-num span {
  font-size: 1rem;
  color: var(--gold);
  margin-left: 2px;
}

.page-about__scale-label {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--muted);
}

.page-about__scale-honors {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about__scale-honor {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 20px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  transition: border-color var(--transition);
}

.page-about__scale-honor:hover {
  border-color: var(--line-gold);
}

.page-about__scale-honor-year {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gold);
  flex-shrink: 0;
}

.page-about__scale-honor p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text);
  margin: 0;
}

.page-about__scale-figure {
  margin: 0;
}

/* ---------- Team 团队 ---------- */
.page-about__team {
  padding: 120px 0;
}

.page-about__team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: center;
}

.page-about__team-copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  margin: 0 0 24px;
}

.page-about__team-copy p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--muted);
  margin: 0 0 16px;
}

.page-about__team-copy p:last-child {
  margin-bottom: 0;
}

.page-about__team-flow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  background: var(--bg-raised);
  padding: 24px;
  border: 1px solid var(--line);
}

.page-about__team-node {
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 22px 14px;
  text-align: center;
  transition: border-color var(--transition), background var(--transition);
}

.page-about__team-node:hover {
  border-color: var(--line-gold);
  background: var(--bg-over);
}

.page-about__team-node-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about__team-node-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.page-about__team-node-role {
  display: block;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--muted);
}

.page-about__team-loop {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--gold);
}

/* ---------- Explore 探索 ---------- */
.page-about__explore {
  padding: 72px 0 96px;
}

.page-about__explore-inner {
  text-align: center;
}

.page-about__explore-inner h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 900;
  margin: 0 0 28px;
}

.page-about__explore-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

/* ---------- Media Queries ---------- */
@media (min-width: 640px) {
  .page-about__scale-honors {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__philosophy-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (min-width: 768px) {
  .page-about {
    --tl-year: 80px;
    --tl-dot: 22px;
    --tl-gap: 14px;
  }

  .page-about__origin-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 64px;
  }

  .page-about__scale-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
  }

  .page-about__team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --tl-year: 92px;
    --tl-dot: 24px;
    --tl-gap: 16px;
  }

  .page-about__hero {
    padding-top: 200px;
    padding-bottom: 100px;
  }

  .page-about__hero-content {
    margin-bottom: 64px;
  }

  .page-about__hero-lead {
    font-size: 1.125rem;
  }

  .page-about__timeline-body {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 56px;
  }

  .page-about__timeline-figure {
    position: sticky;
    top: 120px;
  }

  .page-about__explore {
    padding-top: 88px;
  }
}