.page-about {
  --about-line: 1px solid var(--border-color);
  --about-cloud: var(--color-cloud);
  --about-invert: var(--color-text-invert);
  --about-gold: var(--color-gold);
  --about-night: var(--color-night);
  --about-white: var(--color-white);
  --about-pure: var(--color-pure-white);
  --about-tsampa: var(--color-tsampa);
  --about-red: var(--color-red);
  --about-glacier: var(--color-glacier);
  --about-decor-font: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-family: var(--font-body);
  color: var(--color-text);
  overflow-x: hidden;
  background: var(--color-white);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

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

.page-about__breadcrumb {
  padding-top: var(--space-md);
  padding-bottom: var(--space-sm);
}

.page-about__hero {
  position: relative;
  padding: 0 var(--space-sm) var(--space-lg);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
}

.page-about__hero-badge {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: var(--about-line);
  padding-bottom: 12px;
}

.page-about__hero-index {
  font-size: 1.6rem;
  font-weight: 900;
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
  color: var(--about-night);
  opacity: 0.25;
}

.page-about__hero-kicker,
.page-about__story-mark,
.page-about__capability-head .section-kicker,
.page-about__vision-panel .section-kicker {
  font-family: var(--about-decor-font);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  font-weight: 900;
  color: var(--about-cloud);
  text-transform: uppercase;
  margin-left: auto;
  white-space: nowrap;
}

.page-about__hero-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 1.08;
  letter-spacing: -0.06em;
  color: var(--about-night);
  margin: var(--space-md) 0 0;
  position: relative;
  z-index: 1;
}

.page-about__hero-lead {
  font-size: 1.02rem;
  line-height: 1.85;
  max-width: 52em;
  color: var(--about-night);
  opacity: 0.85;
  margin-top: var(--space-md);
}

.page-about__hero-motto {
  font-family: var(--about-decor-font);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--about-gold);
  background: var(--about-night);
  display: inline-block;
  padding: 8px 18px;
  margin-top: var(--space-md);
}

.page-about__index {
  margin-top: var(--space-lg);
  padding: 20px 0 0;
  border-top: var(--about-line);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 20px;
}

.page-about__index-item {
  font-family: var(--about-decor-font);
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--about-night);
  text-decoration: none;
  padding: 10px 0;
  border-bottom: var(--about-line);
  transition: color 0.24s ease, border-color 0.24s ease, padding-left 0.24s ease;
}

.page-about__index-item:hover {
  color: var(--about-gold);
  border-color: var(--about-gold);
  padding-left: 8px;
}

.page-about__brand-story {
  padding: var(--space-lg) var(--space-sm);
}

.page-about__story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  max-width: 1080px;
  margin: 0 auto;
}

.page-about__story-copy {
  position: relative;
  padding-top: 8px;
}

.page-about__story-mark {
  display: block;
  text-align: left;
  margin: 0 0 8px;
  writing-mode: horizontal-tb;
}

.page-about__story-index,
.page-about__milestone-index,
.page-about__capability-index,
.page-about__vision-index {
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-heading);
  font-size: 4.4rem;
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--about-night);
  opacity: 0.08;
  z-index: 0;
  pointer-events: none;
}

.page-about__story-index {
  right: -4px;
}

.page-about__story-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2.1rem;
  letter-spacing: -0.04em;
  margin: var(--space-md) 0 var(--space-sm);
  position: relative;
  z-index: 1;
  color: var(--about-night);
}

.page-about__story-text {
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: var(--space-md);
  max-width: 52em;
  color: var(--about-night);
}

.page-about__story-text--note {
  border-left: 4px solid var(--about-gold);
  padding-left: 20px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--about-night);
  opacity: 0.78;
  background: var(--color-tsampa);
  padding: 16px 20px;
  margin-top: var(--space-md);
}

.page-about__story-figure {
  border: var(--about-line);
  background: var(--color-pure-white);
  position: relative;
}

.page-about__figcaption {
  font-family: var(--about-decor-font);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--about-cloud);
  padding: 12px 16px;
  border-top: var(--about-line);
  background: var(--color-white);
}

.page-about__milestones {
  background: var(--about-night);
  color: var(--about-invert);
  padding: var(--space-lg) var(--space-sm);
  position: relative;
  overflow: hidden;
}

.page-about__milestones::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--about-gold) 0 25%, var(--about-red) 25% 50%, var(--about-glacier) 50% 75%, var(--about-gold) 75% 100%);
  opacity: 0.7;
}

.page-about__milestone-header {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.page-about__milestone-header > div {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
}

.page-about__kicker--light {
  color: var(--about-gold) !important;
  margin-left: 0;
}

.page-about__milestone-note {
  color: var(--about-invert);
  opacity: 0.7;
  font-size: 0.98rem;
  line-height: 1.75;
  max-width: 34em;
  position: relative;
  padding-left: 18px;
  margin-top: 0;
}

.page-about__milestone-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--about-gold);
}

.page-about__milestone-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2rem;
  letter-spacing: -0.04em;
  margin: 0;
  color: var(--about-invert);
}

.page-about__milestone-index {
  color: var(--about-invert);
  opacity: 0.12;
  position: static;
  font-size: 3.2rem;
  margin-left: auto;
  line-height: 1;
}

.page-about__timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  max-width: 1100px;
  margin: var(--space-lg) auto 0;
  position: relative;
  z-index: 1;
}

.page-about__milestone-card {
  border: 1px solid rgba(245, 247, 250, 0.18);
  background: rgba(15, 31, 61, 0.6);
  padding: var(--space-sm);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.page-about__milestone-card:hover {
  transform: translateY(-4px);
  border-color: var(--about-gold);
  background: rgba(15, 31, 61, 0.85);
}

.page-about__milestone-num {
  font-family: var(--font-data);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--about-gold);
  letter-spacing: 0.04em;
}

.page-about__milestone-tag {
  align-self: flex-start;
  margin: 4px 0 8px;
}

.page-about__milestone-card-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--about-invert);
  line-height: 1.3;
}

.page-about__milestone-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--about-invert);
  opacity: 0.66;
}

.page-about__capability {
  padding: var(--space-lg) var(--space-sm);
}

.page-about__capability-copy {
  max-width: 1000px;
  margin: 0 auto;
}

.page-about__capability-head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  border-bottom: var(--about-line);
  padding-bottom: var(--space-sm);
}

.page-about__capability-index {
  margin-left: auto;
  position: static;
  font-size: 3.2rem;
  opacity: 0.06;
  line-height: 1;
}

.page-about__capability-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2rem;
  letter-spacing: -0.04em;
  margin: 0;
  color: var(--about-night);
}

.page-about__capability-lead {
  font-size: 1.08rem;
  line-height: 1.9;
  color: var(--about-night);
  opacity: 0.85;
  margin-top: var(--space-md);
  margin-bottom: var(--space-md);
  max-width: 44em;
}

.page-about__capacity-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border-color);
  border: var(--about-line);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__capacity-item {
  background: var(--color-pure-white);
  padding: 18px 16px;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about__capacity-label {
  font-family: var(--about-decor-font);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--about-cloud);
  text-transform: uppercase;
  margin: 0;
}

.page-about__capacity-value {
  font-family: var(--font-data);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--about-night);
  letter-spacing: -0.03em;
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  line-height: 1.2;
}

.page-about__capacity-unit {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--about-cloud);
  letter-spacing: 0.06em;
}

.page-about__capacity-desc {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--about-night);
  opacity: 0.7;
  margin: 0;
}

.page-about__capability-figure {
  max-width: 800px;
  margin: var(--space-md) auto 0;
  border: var(--about-line);
  background: var(--color-pure-white);
}

.page-about__vision {
  background: var(--about-tsampa);
  padding: var(--space-lg) var(--space-sm);
}

.page-about__vision-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  max-width: 1100px;
  margin: 0 auto;
  align-items: center;
}

.page-about__vision-panel {
  position: relative;
  padding-top: 12px;
}

.page-about__vision-panel .section-kicker {
  color: var(--about-gold) !important;
  margin-left: 0;
  display: block;
}

.page-about__vision-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2rem;
  letter-spacing: -0.04em;
  margin: var(--space-md) 0 var(--space-sm);
  color: var(--about-night);
}

.page-about__vision-text {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-night);
  opacity: 0.85;
  max-width: 38em;
}

.page-about__vision-quote {
  border-left: 4px solid var(--about-gold);
  padding: 16px 0 16px 20px;
  margin-top: var(--space-md);
  max-width: 30em;
  background: rgba(255, 255, 255, 0.5);
}

.page-about__vision-quote-mark {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--about-gold);
  line-height: 0;
  display: block;
  margin-bottom: 4px;
}

.page-about__vision-quote-text {
  font-size: 1.12rem;
  font-weight: 700;
  font-family: var(--font-heading);
  color: var(--about-night);
  margin: 0 0 8px;
  line-height: 1.5;
  letter-spacing: -0.02em;
}

.page-about__vision-credit {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--about-cloud);
  margin: 0;
}

.page-about__vision-index {
  right: 0;
  top: 0;
  opacity: 0.08;
}

.page-about__vision-figure {
  border: var(--about-line);
  background: var(--color-pure-white);
}

.page-about__closing {
  padding: var(--space-lg) var(--space-sm);
  background: var(--color-white);
}

.page-about__closing-inner {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.page-about__closing-tag {
  margin-bottom: var(--space-md);
}

.page-about__closing-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  letter-spacing: -0.05em;
  line-height: 1.35;
  color: var(--about-night);
  margin: var(--space-md) 0;
}

.page-about__closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: var(--space-md);
}

.page-about__closing-actions .tag-label {
  margin: 0;
}

.page-about__closing-text {
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--about-night);
  opacity: 0.8;
  margin-top: var(--space-md);
  max-width: 40em;
  margin-left: auto;
  margin-right: auto;
}

.page-about__closing-link {
  display: inline-block;
  margin: 0 6px;
  text-decoration: none;
  font-weight: 700;
}

.page-about__closing-inline-link {
  color: var(--about-glacier);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 700;
  transition: color 0.2s ease;
}

.page-about__closing-inline-link:hover {
  color: var(--about-gold);
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 0 var(--space-sm) var(--space-xl);
    gap: var(--space-md);
  }

  .page-about__hero-badge {
    max-width: 1080px;
    margin: 0 auto;
    width: 100%;
  }

  .page-about__hero-index {
    font-size: 1.4rem;
  }

  .page-about__hero-title,
  .page-about__hero-lead,
  .page-about__hero-motto,
  .page-about__index {
    max-width: 1080px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
  }

  .page-about__hero-title {
    margin-top: var(--space-lg);
  }

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

  .page-about__index-item {
    font-size: 0.94rem;
  }

  .page-about__story-grid {
    grid-template-columns: 1fr 1.05fr;
    align-items: start;
    gap: var(--space-lg);
  }

  .page-about__story-copy {
    padding-top: 0;
  }

  .page-about__story-mark {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    position: absolute;
    left: -46px;
    top: 8px;
    text-align: left;
    font-size: 0.68rem;
    letter-spacing: 0.3em;
    color: var(--about-cloud);
    white-space: nowrap;
  }

  .page-about__story-index {
    right: -8px;
    font-size: 6rem;
  }

  .page-about__story-figure {
    margin-top: var(--space-md);
  }

  .page-about__milestones {
    padding: var(--space-xl) var(--space-sm);
  }

  .page-about__milestone-header {
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-lg);
    align-items: end;
  }

  .page-about__milestone-note {
    margin: 0;
  }

  .page-about__timeline {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    margin-top: var(--space-lg);
  }

  .page-about__milestone-card {
    padding: var(--space-md) var(--space-sm);
  }

  .page-about__capability {
    padding: var(--space-xl) var(--space-sm);
  }

  .page-about__capability-lead {
    font-size: 1.18rem;
  }

  .page-about__capacity-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__capacity-item {
    padding: var(--space-sm) 18px;
  }

  .page-about__capacity-value {
    font-size: 2.1rem;
  }

  .page-about__vision {
    padding: var(--space-xl) var(--space-sm);
  }

  .page-about__vision-grid {
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-lg);
  }

  .page-about__vision-title {
    font-size: 2.3rem;
  }

  .page-about__closing {
    padding: var(--space-xl) var(--space-sm);
  }

  .page-about__closing-actions {
    gap: 16px;
  }
}

@media (min-width: 1280px) {
  .page-about__story-grid,
  .page-about__milestone-header,
  .page-about__timeline,
  .page-about__capability-copy,
  .page-about__vision-grid {
    max-width: 1160px;
  }
}