.page-about {
  --about-accent: #3D3BFF;
  --about-accent-warm: #FF6A00;
  --about-ink: #1A1A2E;
  --about-muted: #6B7280;
  --about-bg: #F7F3EB;
  --about-card-bg: #ffffff;
  --about-border: #E5E7EB;
  --about-green: #4E9F7A;
  --about-terracotta: #C9755A;
  --about-radius-lg: 28px;
  --about-radius-md: 16px;
  --about-radius-sm: 8px;
  --about-shadow-soft: 0 8px 30px rgba(26, 26, 46, .08);
  --about-shadow-strong: 0 12px 40px rgba(26, 26, 46, .16);
  --about-font-heading: "Noto Sans SC SemiBold", "微软雅黑", sans-serif;
  --about-font-mono: "Roboto Mono", Consolas, monospace;
  --about-space-section: 5rem;
}

.page-about {
  background:
    radial-gradient(ellipse 60% 40% at 90% 8%, rgba(61, 59, 255, .06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 30% at 10% 45%, rgba(255, 106, 0, .04) 0%, transparent 70%),
    var(--about-bg);
  position: relative;
  overflow: hidden;
}

.page-about .breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 2rem 0;
  font-size: .875rem;
  color: var(--about-muted);
}

.page-about .breadcrumb a {
  color: var(--about-accent);
  text-decoration: none;
  font-weight: 600;
}

.page-about .breadcrumb .sep {
  margin: 0 .5rem;
  color: var(--about-border);
}

/* ===== HERO ===== */
.about-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem 2rem;
  display: grid;
  gap: 2rem;
}

.about-hero__inner {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.about-hero__kicker {
  font-family: var(--about-font-mono);
  font-size: .8125rem;
  letter-spacing: .18em;
  color: var(--about-accent);
  text-transform: uppercase;
  margin: 0 0 1rem;
  position: relative;
  padding-left: 2.5rem;
}

.about-hero__kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2rem;
  height: 2px;
  background: var(--about-accent-warm);
}

.about-hero h1 {
  font-family: var(--about-font-heading);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.2;
  color: var(--about-ink);
  margin: 0 0 1.25rem;
  letter-spacing: -.01em;
}

.about-hero__lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--about-muted);
  max-width: 36rem;
  margin: 0;
}

.about-hero__visual {
  position: relative;
}

.about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 8% 8% auto auto;
  width: 65%;
  height: 65%;
  background: radial-gradient(circle at center, rgba(61, 59, 255, .1) 0%, transparent 65%);
  z-index: 0;
  pointer-events: none;
}

.about-hero__visual img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  border-radius: var(--about-radius-lg);
  box-shadow: var(--about-shadow-strong);
  object-fit: cover;
}

.about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  border-top: 1px solid var(--about-border);
  padding-top: 2rem;
}

.about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.about-hero__stat-num {
  font-family: var(--about-font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--about-ink);
  line-height: 1.1;
}

.about-hero__stat-num sup {
  font-size: 1rem;
  color: var(--about-accent-warm);
  margin-left: .1rem;
}

.about-hero__stat-label {
  font-size: .8125rem;
  color: var(--about-muted);
}

/* ===== SECTION BASE ===== */
.about-section {
  padding: var(--about-space-section) 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section__heading {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.section__index {
  font-family: var(--about-font-mono);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--about-accent);
  white-space: nowrap;
}

.section__heading h2 {
  font-family: var(--about-font-heading);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  color: var(--about-ink);
  margin: 0;
  line-height: 1.25;
  padding-top: .25rem;
}

/* ===== PHILOSOPHY ===== */
.about-philosophy__grid {
  display: grid;
  gap: 2rem;
}

.about-philosophy__text {
  background: var(--about-card-bg);
  border-radius: var(--about-radius-lg);
  padding: 2rem;
  box-shadow: var(--about-shadow-soft);
  border: 1px solid var(--about-border);
  position: relative;
  overflow: hidden;
}

.about-philosophy__text::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(201, 117, 90, .12) 0%, transparent 70%);
  pointer-events: none;
}

.about-philosophy__text p {
  color: var(--about-muted);
  line-height: 1.85;
  font-size: 1rem;
  margin: 0 0 1.25rem;
  position: relative;
  z-index: 1;
}

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

.about-philosophy__aside {
  position: relative;
}

.about-philosophy__card {
  background: var(--about-ink);
  border-radius: var(--about-radius-lg);
  padding: 2.25rem 2rem;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.about-philosophy__card::before {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255, 106, 0, .25);
  pointer-events: none;
}

.about-philosophy__card-tag {
  display: inline-block;
  font-family: var(--about-font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--about-accent-warm);
  text-transform: uppercase;
  border: 1px solid rgba(255, 106, 0, .4);
  border-radius: 999px;
  padding: .3rem .75rem;
  margin-bottom: 1.5rem;
}

.about-philosophy__card-quote {
  font-family: var(--about-font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 1rem;
  line-height: 1.3;
}

.about-philosophy__card-desc {
  font-size: .9375rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, .72);
  margin: 0;
}

/* ===== TIMELINE ===== */
.about-timeline {
  position: relative;
}

.about-timeline__wrap {
  position: relative;
  padding-left: 0;
  display: grid;
  gap: 0;
}

.about-timeline__rail {
  display: none;
}

.about-timeline__item {
  position: relative;
  padding: 1.5rem 0;
}

.about-timeline__node {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin-bottom: 1rem;
}

.about-timeline__node-year {
  font-family: var(--about-font-mono);
  font-size: .875rem;
  font-weight: 700;
  color: var(--about-accent-warm);
  background: rgba(255, 106, 0, .1);
  border-radius: 999px;
  padding: .3rem .8rem;
}

.about-timeline__node-ver {
  font-family: var(--about-font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--about-ink);
  line-height: 1;
}

.about-timeline__card {
  background: var(--about-card-bg);
  border-radius: var(--about-radius-md);
  padding: 1.75rem;
  border: 1px solid var(--about-border);
  box-shadow: var(--about-shadow-soft);
  transition: transform .3s ease, box-shadow .3s ease;
}

.about-timeline__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow-strong);
}

.about-timeline__card h3 {
  font-family: var(--about-font-heading);
  font-size: 1.3rem;
  color: var(--about-ink);
  margin: 0 0 .75rem;
}

.about-timeline__card p {
  color: var(--about-muted);
  line-height: 1.7;
  font-size: .9375rem;
  margin: 0 0 1rem;
}

.about-timeline__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: .5rem;
}

.about-timeline__list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: .875rem;
  color: var(--about-ink);
  line-height: 1.5;
}

.about-timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: .4rem;
  height: .4rem;
  border-radius: 50%;
  background: var(--about-accent);
}

.about-timeline__image {
  margin-top: 2.5rem;
  border-radius: var(--about-radius-lg);
  overflow: hidden;
  box-shadow: var(--about-shadow-soft);
}

.about-timeline__image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ===== COMMITMENT ===== */
.about-commitment__layout {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.about-commitment__text {
  background: var(--about-card-bg);
  border-radius: var(--about-radius-lg);
  padding: 2rem;
  border: 1px solid var(--about-border);
  box-shadow: var(--about-shadow-soft);
}

.about-commitment__text p {
  color: var(--about-muted);
  line-height: 1.8;
  margin: 0 0 1.25rem;
}

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

.about-commitment__text p strong {
  color: var(--about-ink);
}

.about-commitment__visual {
  border-radius: var(--about-radius-lg);
  overflow: hidden;
  box-shadow: var(--about-shadow-soft);
}

.about-commitment__visual img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ===== CERT ===== */
.about-cert__intro {
  background: linear-gradient(135deg, rgba(61, 59, 255, .04) 0%, rgba(255, 106, 0, .03) 100%);
  border-radius: var(--about-radius-md);
  padding: 1.75rem 2rem;
  margin-bottom: 2.5rem;
  border-left: 4px solid var(--about-accent);
}

.about-cert__intro p {
  margin: 0;
  color: var(--about-ink);
  line-height: 1.7;
  font-size: .9375rem;
}

.about-cert__grid {
  display: grid;
  gap: 1.5rem;
}

.about-cert__card {
  background: var(--about-card-bg);
  border-radius: var(--about-radius-md);
  padding: 2rem;
  border: 1px solid var(--about-border);
  box-shadow: var(--about-shadow-soft);
  transition: transform .3s ease, box-shadow .3s ease;
}

.about-cert__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow-strong);
}

.about-cert__icon {
  width: 72px;
  height: 72px;
  background: rgba(61, 59, 255, .06);
  border-radius: var(--about-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.about-cert__card h3 {
  font-family: var(--about-font-heading);
  font-size: 1.15rem;
  color: var(--about-ink);
  margin: 0 0 .75rem;
}

.about-cert__card p {
  color: var(--about-muted);
  line-height: 1.7;
  font-size: .9375rem;
  margin: 0;
}

/* ===== ECOSYSTEM ===== */
.about-ecosystem__layout {
  display: grid;
  gap: 2rem;
}

.about-ecosystem__text {
  background: var(--about-card-bg);
  border-radius: var(--about-radius-lg);
  padding: 2rem;
  border: 1px solid var(--about-border);
  box-shadow: var(--about-shadow-soft);
}

.about-ecosystem__text p {
  color: var(--about-muted);
  line-height: 1.8;
  margin: 0 0 1.25rem;
}

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

.about-ecosystem__map {
  background: var(--about-ink);
  border-radius: var(--about-radius-lg);
  padding: 2rem;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.about-ecosystem__map::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 140px;
  height: 140px;
  background: radial-gradient(circle, rgba(61, 59, 255, .3) 0%, transparent 70%);
  pointer-events: none;
}

.about-ecosystem__map-head {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-family: var(--about-font-heading);
  font-size: 1.125rem;
  margin-bottom: 2rem;
}

.about-ecosystem__map-dot {
  width: .75rem;
  height: .75rem;
  background: var(--about-green);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(78, 159, 122, .2);
}

.about-ecosystem__list {
  display: grid;
  gap: 0;
}

.about-ecosystem__row {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

.about-ecosystem__row:last-child {
  border-bottom: none;
}

.about-ecosystem__row dt {
  font-family: var(--about-font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .5);
}

.about-ecosystem__row dd {
  font-size: .9375rem;
  color: rgba(255, 255, 255, .92);
  margin: 0;
  line-height: 1.5;
}

/* ===== CTA ===== */
.about-cta {
  padding-bottom: var(--about-space-section);
}

.about-cta__inner {
  background:
    linear-gradient(135deg, var(--about-accent) 0%, #5855EE 60%, #7B78F5 100%);
  border-radius: var(--about-radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--about-shadow-strong);
}

.about-cta__inner::before {
  content: "";
  position: absolute;
  left: -40px;
  top: -40px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 24px solid rgba(255, 255, 255, .06);
  pointer-events: none;
}

.about-cta__inner::after {
  content: "";
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255, 106, 0, .25);
  pointer-events: none;
}

.about-cta__inner h2 {
  font-family: var(--about-font-heading);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  color: #fff;
  margin: 0 0 1rem;
  position: relative;
  z-index: 1;
}

.about-cta__inner p {
  color: rgba(255, 255, 255, .85);
  line-height: 1.7;
  max-width: 30rem;
  margin: 0 auto 2rem;
  position: relative;
  z-index: 1;
  font-size: .9375rem;
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.about-cta__actions .btn {
  display: inline-block;
  padding: .85rem 1.75rem;
  border-radius: 50px;
  font-family: var(--about-font-heading);
  font-size: .9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform .25s ease, box-shadow .25s ease;
  border: none;
  cursor: pointer;
}

.about-cta__actions .btn:hover {
  transform: translateY(-2px);
}

.about-cta__actions .btn-primary {
  background: #fff;
  color: var(--about-accent);
  box-shadow: 0 6px 18px rgba(0, 0, 0, .12);
}

.about-cta__actions .btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, .6);
}

.about-cta__actions .btn-accent {
  background: var(--about-accent-warm);
  color: #fff;
  box-shadow: 0 6px 18px rgba(255, 106, 0, .3);
}

/* ===== REVEAL STATE ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (min-width: 768px) {
  .about-hero__inner {
    grid-template-columns: 1.1fr .9fr;
    gap: 3rem;
  }

  .about-hero__visual {
    order: 2;
  }

  .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

  .about-philosophy__grid {
    grid-template-columns: 1.4fr .8fr;
    gap: 2.5rem;
    align-items: stretch;
  }

  .about-timeline__wrap {
    position: relative;
    padding-left: 3.5rem;
  }

  .about-timeline__rail {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--about-accent) 0%, var(--about-terracotta) 60%, var(--about-green) 100%);
    border-radius: 2px;
  }

  .about-timeline__item {
    position: relative;
  }

  .about-timeline__item::before {
    content: "";
    position: absolute;
    left: -3.5rem;
    top: 2.5rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--about-accent-warm);
    border: 3px solid var(--about-bg);
    box-shadow: 0 0 0 2px var(--about-accent-warm);
    z-index: 1;
  }

  .about-commitment__layout {
    grid-template-columns: 1.1fr .9fr;
    gap: 3rem;
  }

  .about-cert__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .about-ecosystem__layout {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: stretch;
  }

  .about-cta__inner {
    padding: 4rem 3rem;
  }
}

@media (min-width: 1024px) {
  .about-hero {
    padding: 4rem 2rem 3rem;
  }

  .about-section {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .section__heading {
    margin-bottom: 4rem;
  }

  .about-timeline__card {
    padding: 2.25rem 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-timeline__card:hover,
  .page-about .about-cert__card:hover {
    transform: none;
  }
}