.page-about {
  --glass-bg: rgba(18, 26, 42, .68);
  --glass-border: rgba(34, 48, 73, .55);
  --story-section-pad: clamp(56px, 9vw, 112px) 0;
}

.page-about .breadcrumb {
  margin-bottom: 24px;
}

.page-about .story-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
  background: linear-gradient(180deg, #0A0E17 0%, #0D1322 55%, #121A2A 100%);
}

.page-about .story-hero::before {
  content: "CN";
  position: absolute;
  right: -2rem;
  bottom: -1.5rem;
  font-family: var(--heading);
  font-size: clamp(120px, 28vw, 320px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--blue);
  opacity: .06;
  pointer-events: none;
  z-index: 0;
}

.page-about .story-hero::after {
  content: "";
  position: absolute;
  top: -140px;
  right: -80px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(0, 163, 255, .18), transparent 70%);
  pointer-events: none;
}

.page-about .story-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 920px;
}

.page-about .story-hero__title {
  font-family: var(--heading);
  font-size: clamp(30px, 5.5vw, 62px);
  line-height: 1.1;
  margin: 16px 0 24px;
  text-wrap: balance;
  color: var(--text);
}

.page-about .story-hero__lead {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.75;
  color: var(--muted);
  max-width: 680px;
  margin-bottom: 28px;
}

.page-about .story-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .story-section {
  padding: var(--story-section-pad);
}

.page-about .story-section--origin {
  background: linear-gradient(180deg, #0A0E17 0%, #0D1322 100%);
}

.page-about .story-section--method {
  background: linear-gradient(180deg, #0D1322 0%, #12101F 100%);
}

.page-about .story-section--apple {
  background: linear-gradient(180deg, #12101F 0%, #161226 100%);
}

.page-about .story-section--round {
  background: linear-gradient(180deg, #161226 0%, #0F1424 100%);
}

.page-about .story-section--principles {
  background: linear-gradient(180deg, #0F1424 0%, #0A0E17 100%);
}

.page-about .section-head__title {
  font-family: var(--heading);
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.15;
  margin: 10px 0 12px;
  color: var(--text);
}

.page-about .section-head__desc {
  max-width: 640px;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 0;
}

.page-about .story-timeline__banner {
  margin-top: 40px;
  border-radius: 24px;
  overflow: hidden;
}

.page-about .story-timeline {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .story-timeline__side {
  display: none;
}

.page-about .story-timeline__track {
  position: relative;
  margin-left: 18px;
}

.page-about .story-timeline__track::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--line) 0%, var(--blue) 65%, var(--green) 100%);
  opacity: .4;
}

.page-about .timeline-node {
  position: relative;
  padding-left: 34px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .timeline-node:last-child {
  margin-bottom: 0;
}

.page-about .timeline-node__dot {
  position: absolute;
  left: -8px;
  top: 8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 3px solid var(--blue);
  box-shadow: 0 0 0 4px rgba(0, 163, 255, .15);
  transition: background .3s ease, box-shadow .3s ease;
}

.page-about .timeline-node[data-reveal].is-revealed .timeline-node__dot {
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, .2);
}

.page-about .timeline-node__card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 20px 22px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .timeline-node:hover .timeline-node__card {
  border-color: var(--blue);
  transform: translateX(4px);
}

.page-about .timeline-node--current .timeline-node__card {
  border-color: rgba(0, 163, 255, .5);
  box-shadow: 0 0 0 4px rgba(0, 163, 255, .08);
}

.page-about .timeline-node__stage {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: 6px;
}

.page-about .timeline-node__title {
  font-family: var(--heading);
  font-size: clamp(20px, 2.4vw, 26px);
  margin: 0 0 10px;
  color: var(--text);
}

.page-about .timeline-node__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .timeline-node__data {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(57, 255, 136, .08);
  color: var(--green);
  font-size: 13px;
  font-weight: 500;
  transition: background .25s ease;
}

.page-about .timeline-node:hover .timeline-node__data {
  background: rgba(57, 255, 136, .16);
}

.page-about .story-method {
  display: grid;
  gap: 32px;
  margin-top: 40px;
  align-items: center;
}

.page-about .story-method__media {
  border-radius: 24px;
  overflow: hidden;
}

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

.page-about .story-method__step {
  position: relative;
  padding: 18px 22px;
  border-radius: 18px;
  background: rgba(18, 26, 42, .62);
  border: 1px solid rgba(34, 48, 73, .5);
  transition: border-color .25s ease, background .25s ease;
}

.page-about .story-method__step:hover {
  border-color: rgba(0, 163, 255, .45);
  background: rgba(18, 26, 42, .82);
}

.page-about .story-method__num {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--blue);
}

.page-about .story-method__step h3 {
  font-family: var(--heading);
  font-size: 17px;
  margin: 6px 0 4px;
  color: var(--text);
}

.page-about .story-method__step p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .story-apple {
  display: grid;
  gap: 32px;
  margin-top: 40px;
  align-items: center;
}

.page-about .story-apple__media {
  border-radius: 24px;
  overflow: hidden;
}

.page-about .story-apple__grid {
  display: grid;
  gap: 14px;
}

.page-about .apple-entry {
  padding: 20px 22px;
  border-radius: 18px;
  background: rgba(18, 26, 42, .62);
  border-left: 3px solid var(--purple);
  transition: transform .25s ease, background .25s ease;
}

.page-about .apple-entry:hover {
  transform: translateX(4px);
  background: rgba(18, 26, 42, .85);
}

.page-about .apple-entry__num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--purple);
  margin-bottom: 6px;
}

.page-about .apple-entry h3 {
  margin: 0 0 6px;
  font-family: var(--heading);
  font-size: 18px;
  color: var(--text);
}

.page-about .apple-entry p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .story-round__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 40px;
  padding: clamp(28px, 4vw, 48px);
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(123, 92, 255, .16) 0%, rgba(18, 26, 42, .92) 60%);
  border: 1px solid rgba(123, 92, 255, .35);
  position: relative;
  overflow: hidden;
}

.page-about .story-round__big {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .story-round__big .num {
  font-family: var(--mono);
  font-size: clamp(88px, 14vw, 160px);
  font-weight: 800;
  line-height: .9;
  color: var(--green);
  text-shadow: 0 0 32px rgba(57, 255, 136, .35);
}

.page-about .story-round__unit {
  font-family: var(--heading);
  font-size: 28px;
  color: var(--text);
}

.page-about .story-round__lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .story-round__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 20px;
}

.page-about .story-round__stat {
  padding: 16px 18px;
  border-radius: 14px;
  background: rgba(10, 14, 23, .5);
  border: 1px solid rgba(34, 48, 73, .4);
}

.page-about .story-round__value {
  display: block;
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  margin-top: 6px;
  color: var(--text);
}

.page-about .story-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 40px;
}

.page-about .principle-card {
  border-radius: 20px;
  background: rgba(18, 26, 42, .68);
  border: 1px solid rgba(34, 48, 73, .5);
  overflow: hidden;
  transition: border-color .25s ease;
}

.page-about .principle-card:hover {
  border-color: rgba(0, 163, 255, .4);
}

.page-about .principle-card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 24px;
  transition: background .25s ease;
}

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

.page-about .principle-card summary:hover {
  background: rgba(0, 163, 255, .04);
}

.page-about .principle-card__num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--yellow);
}

.page-about .principle-card__title {
  font-family: var(--heading);
  font-size: 22px;
  color: var(--text);
}

.page-about .principle-card__desc {
  font-size: 14px;
  color: var(--muted);
}

.page-about .principle-card__expand {
  padding: 0 24px 22px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .story-cta {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 8vw, 96px) 0;
  background: radial-gradient(120% 160% at 80% -20%, rgba(123, 92, 255, .5), transparent 60%), linear-gradient(135deg, #0A0E17 0%, #181033 70%, #241B56 100%);
}

.page-about .story-cta::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -20%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: rgba(255, 209, 102, .1);
  filter: blur(40px);
  pointer-events: none;
}

.page-about .story-cta__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.page-about .story-cta__title {
  font-family: var(--heading);
  font-size: clamp(26px, 4vw, 40px);
  margin: 8px 0 12px;
  color: var(--text);
}

.page-about .story-cta__desc {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(245, 248, 255, .85);
  margin-bottom: 28px;
}

.page-about .story-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

@media (min-width: 640px) {
  .page-about .story-round__stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .story-round__panel {
    grid-template-columns: auto 1fr;
    align-items: center;
  }

  .page-about .story-method__steps {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .page-about .story-principles {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .story-apple__grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .apple-entry:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .page-about .story-timeline {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: clamp(32px, 5vw, 64px);
    margin-top: clamp(40px, 6vw, 64px);
  }

  .page-about .story-timeline__side {
    display: block;
  }

  .page-about .story-timeline__sticky {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .page-about .story-timeline__brand {
    font-family: var(--heading);
    font-size: 34px;
    color: var(--text);
    line-height: 1.1;
  }

  .page-about .story-timeline__note {
    font-size: 13px;
    color: var(--muted);
    margin: 0;
  }

  .page-about .story-method {
    grid-template-columns: 1.05fr 0.95fr;
  }

  .page-about .story-apple {
    grid-template-columns: 0.85fr 1.15fr;
  }

  .page-about .story-apple__grid {
    grid-template-columns: 1fr;
  }

  .page-about .apple-entry:last-child {
    grid-column: auto;
  }
}

@media (min-width: 1280px) {
  .page-about .story-principles {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .story-principles {
    gap: 18px;
  }

  .page-about .principle-card summary {
    padding: 26px 18px 18px;
  }

  .page-about .principle-card__expand {
    padding: 0 18px 20px;
  }

  .page-about .story-round__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}