.page-about {
  --about-gutter: 22px;
  --about-card-radius: 22px;
  --about-deep: #06132b;
}

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

.page-about .visual-frame {
  background: var(--c-pale);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.page-about .visual-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about__hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--about-deep) 100%);
  color: var(--c-white);
  padding: 34px 0 54px;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  border: 64px solid rgba(255, 215, 0, 0.08);
  top: -160px;
  right: -140px;
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  width: 320px;
  height: 320px;
  border: 2px dashed rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  bottom: -120px;
  left: -80px;
  pointer-events: none;
}

.page-about__crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-silver);
  margin-bottom: 30px;
}

.page-about__crumb a {
  color: var(--c-silver);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.page-about__crumb-sep {
  color: var(--c-gold);
  font-weight: 700;
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 38px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about__hero-copy {
  min-width: 0;
}

.page-about__eyebrow {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.page-about__title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 7vw, 58px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
  color: var(--c-white);
  max-width: 11em;
}

.page-about__lead {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.88);
  max-width: 42em;
  margin-bottom: 26px;
}

.page-about__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about__tag {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.04);
  color: var(--c-white);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.2;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-about__tag:hover {
  border-color: var(--c-gold);
  background: rgba(255, 215, 0, 0.12);
  color: var(--c-gold);
}

.page-about__hero-panel {
  position: relative;
  min-width: 0;
  transform: translateY(10px);
}

.page-about__hero-visual {
  aspect-ratio: 4 / 3;
  transform: rotate(1.5deg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.page-about__hero-stat {
  position: relative;
  z-index: 2;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  background: var(--c-gold);
  color: var(--c-navy);
  border-radius: 18px;
  padding: 16px 22px;
  margin-top: -30px;
  margin-left: clamp(12px, 4vw, 48px);
  transform: rotate(-2deg);
  box-shadow: var(--shadow-lg);
}

.page-about__hero-num {
  font-family: var(--font-heading);
  font-size: 34px;
  line-height: 1;
  color: var(--c-navy);
}

.page-about__hero-label {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--c-navy);
}

.page-about__origin {
  padding: 58px 0 62px;
}

.page-about__origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.page-about__origin-copy {
  min-width: 0;
}

.page-about__origin-copy .section-title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.5vw, 40px);
  line-height: 1.12;
  color: var(--c-navy);
  margin: 6px 0 18px;
}

.page-about__origin-quote {
  font-family: var(--font-heading);
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.3;
  color: var(--c-navy);
  border-left: 4px solid var(--c-gold);
  padding-left: 20px;
  margin: 18px 0 24px;
}

.page-about__quote-mark {
  display: block;
  font-family: var(--font-heading);
  font-size: 72px;
  line-height: 0.6;
  color: var(--c-gold);
  margin-bottom: 10px;
}

.page-about__origin-copy p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mid);
  margin: 0 0 14px;
}

.page-about__origin-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about__principle {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-silver);
  border-radius: var(--about-card-radius);
  padding: 22px 24px 20px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.2s ease;
  min-width: 0;
}

.page-about__principle::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 18px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 10px solid rgba(255, 215, 0, 0.12);
  pointer-events: none;
}

.page-about__principle:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-gold);
}

.page-about__principle-num {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-anchor);
}

.page-about__principle h3 {
  font-family: var(--font-heading);
  font-size: 19px;
  color: var(--c-navy);
  margin: 8px 0 8px;
}

.page-about__principle p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mid);
  margin: 0;
}

.page-about__milestones {
  padding: 58px 0 62px;
}

.page-about__milestones-head {
  margin-bottom: 36px;
}

.page-about__milestones-head .section-title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.5vw, 40px);
  line-height: 1.12;
  color: var(--c-navy);
  margin: 6px 0 10px;
}

.page-about__milestones-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.page-about__period-tabs {
  min-width: 0;
}

.page-about__period-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about__period-btn {
  appearance: none;
  border: 1px solid var(--c-silver);
  background: var(--c-white);
  color: var(--c-navy);
  font-family: var(--font-heading);
  font-size: 14px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.page-about__period-btn:hover {
  border-color: var(--c-gold);
  color: var(--c-anchor);
}

.page-about__period-btn[aria-selected="true"] {
  background: var(--c-navy);
  border-color: var(--c-navy);
  color: var(--c-white);
  box-shadow: var(--shadow-sm);
}

.page-about__period-btn:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 2px;
}

.page-about__period-panel {
  display: block;
  padding: 18px 0;
  border-top: 1px solid var(--c-silver);
  border-bottom: 1px solid var(--c-silver);
  margin-bottom: 8px;
}

.page-about__period-panel h3 {
  font-family: var(--font-heading);
  font-size: 21px;
  color: var(--c-navy);
  margin: 0 0 8px;
}

.page-about__period-panel p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-mid);
  margin: 0;
}

.page-about__timeline {
  position: relative;
  min-width: 0;
}

.page-about__timeline-axis {
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  height: 100%;
  pointer-events: none;
}

.page-about__timeline-item {
  position: relative;
  padding-left: 58px;
  margin-bottom: 18px;
  animation: page-about-rise 0.6s ease-out both;
}

.page-about__timeline-item:nth-child(2) {
  animation-delay: 0.12s;
}

.page-about__timeline-item:nth-child(3) {
  animation-delay: 0.24s;
}

.page-about__timeline-item:nth-child(4) {
  animation-delay: 0.36s;
}

.page-about__timeline-item:nth-child(5) {
  animation-delay: 0.48s;
}

.page-about__timeline-item:last-child {
  margin-bottom: 0;
}

.page-about__dot {
  position: absolute;
  left: 12px;
  top: 22px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--c-gold);
  border: 3px solid var(--c-white);
  box-shadow: 0 0 0 2px var(--c-gold);
}

.page-about__timeline-card {
  background: var(--c-white);
  border-radius: var(--radius-md);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--c-gold);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  min-width: 0;
}

.page-about__timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.page-about__timeline-year {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-anchor);
  background: var(--c-pale);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  margin-bottom: 8px;
}

.page-about__timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--c-navy);
  margin: 0 0 6px;
}

.page-about__timeline-card p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mid);
  margin: 0;
}

@keyframes page-about-rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__timeline-item,
  .page-about__stat-card,
  .page-about__principle,
  .page-about__timeline-card {
    animation: none;
    transition: none;
  }
}

.page-about__protocol {
  position: relative;
  overflow: hidden;
  padding: 58px 0 62px;
  color: var(--c-white);
}

.page-about__protocol::before {
  content: "";
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: rgba(255, 215, 0, 0.05);
  bottom: -180px;
  left: -120px;
  pointer-events: none;
}

.page-about__protocol-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 42px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about__protocol-copy {
  min-width: 0;
}

.page-about__protocol-copy .section-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4.5vw, 42px);
  line-height: 1.1;
  color: var(--c-white);
  margin: 6px 0 14px;
}

.page-about__protocol-desc {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
  max-width: 40em;
  margin-bottom: 28px;
}

.page-about__protocol-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about__protocol-steps li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  min-width: 0;
}

.page-about__protocol-steps h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  color: var(--c-white);
  margin: 0 0 4px;
}

.page-about__protocol-steps p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.76);
  margin: 0;
}

.page-about__step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 215, 0, 0.14);
  color: var(--c-gold);
  font-family: var(--font-heading);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.page-about__protocol-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
}

.page-about__text-link {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-white);
  text-decoration: none;
  border-bottom: 2px solid var(--c-gold);
  padding-bottom: 4px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about__text-link:hover {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about__protocol-visual {
  position: relative;
  min-width: 0;
}

.page-about__protocol-figure {
  aspect-ratio: 5 / 4;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transform: rotate(-1deg);
}

.page-about__protocol-stamp {
  position: absolute;
  right: -8px;
  bottom: -18px;
  font-family: var(--font-heading);
  font-size: 120px;
  line-height: 1;
  color: rgba(255, 215, 0, 0.16);
  user-select: none;
  pointer-events: none;
  z-index: 2;
}

.page-about__protocol-caption {
  position: absolute;
  left: 18px;
  bottom: -22px;
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-white);
  background: var(--c-anchor);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  z-index: 2;
}

.page-about__stats {
  padding: 58px 0 62px;
}

.page-about__stats-head {
  margin-bottom: 32px;
}

.page-about__stats-head .section-title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.5vw, 40px);
  line-height: 1.12;
  color: var(--c-navy);
  margin: 6px 0 10px;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about__stat-card {
  background: var(--c-white);
  border: 1px solid var(--c-silver);
  border-radius: var(--about-card-radius);
  padding: 22px 18px;
  box-shadow: var(--shadow-sm);
  min-width: 0;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.2s ease;
}

.page-about__stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-gold);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1;
  color: var(--c-navy);
  margin-bottom: 10px;
}

.page-about__stat-num::after {
  content: "";
  display: block;
  width: 36px;
  height: 3px;
  border-radius: 2px;
  background: var(--c-gold);
  margin-top: 10px;
}

.page-about__stat-label {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-mid);
  display: block;
}

.page-about__stats-foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: center;
  margin-top: 40px;
}

.page-about__stats-visual {
  aspect-ratio: 3 / 2;
  border-radius: var(--radius-lg);
  transform: rotate(1deg);
  box-shadow: var(--shadow-lg);
  min-width: 0;
}

.page-about__people {
  position: relative;
  background: var(--c-pale);
  border-radius: var(--radius-lg);
  padding: 30px 26px 28px;
  border: 1px solid var(--c-gold);
  box-shadow: var(--shadow-sm);
  min-width: 0;
}

.page-about__people::before {
  content: "";
  position: absolute;
  right: -10px;
  top: -10px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--c-gold);
  opacity: 0.22;
  pointer-events: none;
}

.page-about__people h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--c-navy);
  margin: 6px 0 10px;
}

.page-about__people p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-mid);
  margin: 0 0 18px;
}

.page-about__module-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
}

.page-about__module-list li {
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--c-navy);
  background: var(--c-white);
  border: 1px solid var(--c-silver);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}

.page-about__people-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about__people-tag {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--c-anchor);
  background: var(--c-white);
  border: 1px dashed var(--c-gold);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}

.page-about__closing {
  position: relative;
  overflow: hidden;
  padding: 64px 0 70px;
  color: var(--c-white);
  text-align: center;
}

.page-about__closing::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 40px solid rgba(255, 215, 0, 0.12);
  pointer-events: none;
}

.page-about__closing .section-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.1;
  color: var(--c-white);
  margin: 8px 0 16px;
}

.page-about__closing-desc {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
  max-width: 34em;
  margin: 0 auto 30px;
}

.page-about__closing-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 16px;
}

.page-about__closing-actions .page-about__text-link {
  color: var(--c-white);
}

@media (min-width: 640px) {
  .page-about__origin-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 40px 0 64px;
  }

  .page-about__hero-grid {
    gap: 48px;
  }

  .page-about__hero-visual {
    transform: rotate(2deg);
  }

  .page-about__period-tabs__bar {
    flex-wrap: nowrap;
  }

  .page-about__period-btn {
    flex: 1 0 auto;
  }

  .page-about__protocol {
    padding: 64px 0 72px;
  }

  .page-about__stats {
    padding: 64px 0 70px;
  }
}

@media (min-width: 1024px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about__origin-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }

  .page-about__origin-copy {
    padding-top: 12px;
  }

  .page-about__milestones-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }

  .page-about__protocol-grid {
    grid-template-columns: minmax(0, 11fr) minmax(0, 9fr);
    gap: 60px;
  }

  .page-about__stats-foot {
    grid-template-columns: minmax(0, 11fr) minmax(0, 9fr);
    gap: 56px;
  }

  .page-about__stats-visual {
    transform: rotate(-1deg);
  }

  .page-about__protocol-stamp {
    right: -12px;
    font-size: 140px;
  }
}