.page-about {
  --_x-pad: 20px;
  --_plaque-w: 280px;
  --_grid-gap: 16px;
  background: var(--c-cream);
  color: var(--c-dark-gray);
}

.page-about .breadcrumb {
  margin: 0 0 24px;
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--c-gray-blue);
}

.page-about .page-kicker,
.page-about .section-kicker {
  letter-spacing: 0.08em;
}

.page-about__hero {
  padding: 48px var(--_x-pad) 40px;
  background: var(--c-deep);
  position: relative;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  right: -80px;
  top: -80px;
  background: radial-gradient(circle, rgba(255, 78, 0, 0.55) 0%, rgba(198, 255, 0, 0.12) 46%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__hero-frame {
  position: relative;
  padding: 40px 28px 36px;
  background: rgba(247, 243, 232, 0.06);
  border: 1px solid rgba(247, 243, 232, 0.16);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-rail);
}

.page-about__hero-corner {
  position: absolute;
  width: 40px;
  height: 40px;
  border-color: var(--c-accent);
  border-style: solid;
  border-width: 0;
}

.page-about__hero-corner--tl {
  left: 14px;
  top: 14px;
  border-left-width: 4px;
  border-top-width: 4px;
  border-top-left-radius: 10px;
}

.page-about__hero-corner--tr {
  right: 14px;
  top: 14px;
  border-right-width: 4px;
  border-top-width: 4px;
  border-top-right-radius: 10px;
}

.page-about__hero-corner--bl {
  left: 14px;
  bottom: 14px;
  border-left-width: 4px;
  border-bottom-width: 4px;
  border-bottom-left-radius: 10px;
}

.page-about__hero-corner--br {
  right: 14px;
  bottom: 14px;
  border-right-width: 4px;
  border-bottom-width: 4px;
  border-bottom-right-radius: 10px;
}

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

.page-about__hero .page-kicker {
  color: var(--c-accent);
  font-size: 12px;
  font-weight: 700;
}

.page-about__hero .page-title {
  color: var(--c-white);
  margin: 12px 0 14px;
  font-family: var(--font-headline);
  font-size: clamp(40px, 8vw, 72px);
  line-height: 0.98;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  max-width: 9em;
}

.page-about__hero .page-desc {
  color: rgba(247, 243, 232, 0.78);
  font-size: 14px;
  line-height: 1.75;
  max-width: 52em;
  margin-bottom: 28px;
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  border-top: 1px solid rgba(247, 243, 232, 0.18);
  padding-top: 20px;
  margin: 0;
  list-style: none;
}

.page-about__hero-stat {
  margin: 0;
}

.page-about__hero-stat-label {
  font-size: 11px;
  color: var(--c-gray-lite);
  margin-bottom: 4px;
  display: block;
}

.page-about__hero-stat-num {
  font-size: clamp(20px, 4vw, 32px);
  line-height: 1;
  color: var(--c-accent);
}

.page-about__exhibit {
  display: block;
  padding: 0 var(--_x-pad);
  max-width: var(--container-w);
  margin: 0 auto;
}

.page-about__plaque {
  position: relative;
  margin: -24px auto 28px;
  max-width: 560px;
  background: var(--c-white);
  border: 1px solid rgba(26, 42, 58, 0.1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px 22px;
  z-index: 3;
}

.page-about__plaque::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--c-primary);
  border-top-left-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-lg);
}

.page-about__stamp {
  width: 56px;
  height: 56px;
  background: var(--c-primary);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-headline);
  font-size: 30px;
  color: var(--c-white);
  box-shadow: 4px 4px 0 rgba(26, 42, 58, 0.18);
  margin-bottom: 20px;
}

.page-about__plaque-kicker {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-primary);
  margin-bottom: 8px;
}

.page-about__plaque-title {
  font-family: var(--font-headline);
  font-size: 28px;
  color: var(--c-deep);
  margin: 0 0 10px;
  line-height: 1.1;
}

.page-about__plaque-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-dark-gray);
  margin-bottom: 16px;
}

.page-about__plaque-list {
  list-style: none;
  padding: 0;
  margin: 0 0 18px;
  border-top: 1px dashed rgba(74, 91, 109, 0.3);
}

.page-about__plaque-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0 8px;
  border-bottom: 1px dashed rgba(74, 91, 109, 0.22);
  font-size: 13px;
}

.page-about__plaque-list .data-mono {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-primary);
}

.page-about__plaque-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about__plaque-actions .btn {
  flex: 1;
  min-width: 120px;
  text-align: center;
}

.page-about__exhibit-main {
  min-width: 0;
}

.page-about__snapshot,
.page-about__pipeline,
.page-about__milestones,
.page-about__commitments {
  padding-bottom: 44px;
}

.page-about__snapshot-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}

.page-about__snapshot-content .section-kicker {
  color: var(--c-primary);
  font-size: 12px;
}

.page-about__snapshot-content .section-title {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 40px);
  color: var(--c-deep);
  margin: 8px 0 16px;
}

.page-about__snapshot-content p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-dark-gray);
  margin-bottom: 14px;
}

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

.page-about__snapshot-figure {
  margin: 0;
  position: relative;
}

.page-about__snapshot-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  object-fit: cover;
}

.page-about__snapshot-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--c-gray-blue);
  text-align: right;
  border-right: 3px solid var(--c-primary);
  padding-right: 10px;
}

.page-about__pipeline {
  position: relative;
}

.page-about__pipeline .section-kicker {
  color: var(--c-primary);
  font-size: 12px;
}

.page-about__pipeline .section-title {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 40px);
  color: var(--c-deep);
  margin: 8px 0 12px;
}

.page-about__pipeline .section-desc,
.page-about__milestones .section-desc,
.page-about__commitments .section-desc {
  font-size: 14px;
  color: var(--c-gray-blue);
  margin-bottom: 22px;
  max-width: 36em;
}

.page-about__pipeline-visual {
  margin: 0 0 24px;
}

.page-about__pipeline-visual img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  object-fit: cover;
}

.page-about__pipeline-visual figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--c-gray-blue);
  text-align: right;
}

.page-about__pipeline-svg-wrap {
  overflow-x: auto;
  margin-bottom: 24px;
}

.page-about__pipeline-svg {
  width: 100%;
  min-width: 680px;
  height: auto;
  display: block;
}

.page-about__pipeline-svg text {
  font-family: var(--font-body);
}

.page-about__pipe-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__pipe-card {
  position: relative;
  background: var(--c-white);
  border: 1px solid rgba(26, 42, 58, 0.1);
  border-radius: var(--radius);
  padding: 22px 20px 18px;
  box-shadow: var(--shadow-card);
  transition: transform var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast);
}

.page-about__pipe-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-accent) 100%);
  border-radius: var(--radius) var(--radius) 0 0;
  transform: scaleX(0.4);
  transform-origin: left;
  transition: transform var(--t-base);
}

.page-about__pipe-card:hover,
.page-about__pipe-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(255, 78, 0, 0.4);
  box-shadow: 0 8px 28px rgba(26, 42, 58, 0.14);
}

.page-about__pipe-card:hover::before,
.page-about__pipe-card:focus-within::before {
  transform: scaleX(1);
}

.page-about__pipe-num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-primary);
  margin-bottom: 8px;
}

.page-about__pipe-card h3 {
  font-family: var(--font-headline);
  font-size: 24px;
  color: var(--c-deep);
  margin: 0 0 10px;
}

.page-about__pipe-card p:not(.page-about__pipe-num) {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-dark-gray);
  margin-bottom: 0;
}

.page-about__pipe-note {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 12px;
  color: var(--c-gray-blue);
  background: var(--c-cream);
  border-left: 3px solid var(--c-accent);
  padding: 0 10px;
  margin-top: 12px;
  transition: max-height 0.3s ease, opacity 0.25s ease, padding 0.3s ease, margin-top 0.3s ease;
}

.page-about__pipe-card:hover .page-about__pipe-note,
.page-about__pipe-card:focus-within .page-about__pipe-note {
  max-height: 90px;
  opacity: 1;
  padding: 10px 10px;
  margin-top: 12px;
}

.page-about__milestones {
  position: relative;
}

.page-about__milestones .section-kicker {
  color: var(--c-primary);
  font-size: 12px;
}

.page-about__milestones .section-title {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 40px);
  color: var(--c-deep);
  margin: 8px 0 12px;
}

.page-about__milestones-bg {
  margin: 0 0 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(26, 42, 58, 0.08);
}

.page-about__milestones-bg img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about__timeline {
  position: relative;
  margin: 0;
  padding-left: 8px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: repeating-linear-gradient(to bottom, var(--c-primary) 0 8px, transparent 8px 14px);
  border-radius: 99px;
}

.page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about__timeline-rail {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  z-index: 1;
}

.page-about__timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-white);
  border: 4px solid var(--c-primary);
  display: block;
  box-shadow: 0 0 0 4px rgba(255, 78, 0, 0.14);
}

.page-about__timeline-dot--accent {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(198, 255, 0, 0.25);
}

.page-about__timeline-code {
  font-size: 10px;
  font-weight: 700;
  color: var(--c-deep);
  background: var(--c-cream);
  padding: 2px 6px;
  border-radius: 3px;
  letter-spacing: 0.04em;
}

.page-about__timeline-panel {
  background: var(--c-white);
  border: 1px solid rgba(26, 42, 58, 0.1);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.page-about__timeline-item:hover .page-about__timeline-panel,
.page-about__timeline-item:focus-within .page-about__timeline-panel {
  border-color: rgba(255, 78, 0, 0.3);
  box-shadow: 0 8px 24px rgba(26, 42, 58, 0.12);
}

.page-about__timeline-title {
  font-family: var(--font-headline);
  font-size: 22px;
  color: var(--c-deep);
  margin: 0 0 6px;
}

.page-about__timeline-meta {
  font-size: 12px;
  color: var(--c-primary);
  font-weight: 700;
  margin-bottom: 10px;
}

.page-about__timeline-details summary {
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-deep);
  background: var(--c-cream);
  border-radius: var(--radius);
  padding: 8px 12px;
  display: inline-block;
  list-style: none;
  transition: background var(--t-fast), color var(--t-fast);
}

.page-about__timeline-details summary::-webkit-details-marker {
  display: none;
}

.page-about__timeline-details summary::before {
  content: "+ ";
  color: var(--c-primary);
  font-weight: 700;
}

.page-about__timeline-details[open] summary {
  background: var(--c-deep);
  color: var(--c-white);
}

.page-about__timeline-details[open] summary::before {
  content: "− ";
  color: var(--c-accent);
}

.page-about__timeline-details p {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-dark-gray);
  border-left: 3px solid var(--c-accent);
  padding-left: 14px;
}

.page-about__commitments {
  background: var(--c-cream);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  position: relative;
  overflow: hidden;
}

.page-about__commitments::before {
  content: "";
  position: absolute;
  right: -50px;
  top: -50px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(255, 78, 0, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__commitments .section-kicker {
  color: var(--c-primary);
  font-size: 12px;
}

.page-about__commitments .section-title {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 40px);
  color: var(--c-deep);
  margin: 8px 0 12px;
}

.page-about__commit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about__commit-card {
  background: var(--c-white);
  border: 1px solid rgba(26, 42, 58, 0.1);
  border-radius: var(--radius);
  padding: 22px 18px;
  box-shadow: var(--shadow-card);
  transition: transform var(--t-fast), border-color var(--t-fast);
}

.page-about__commit-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 78, 0, 0.35);
}

.page-about__commit-num {
  display: block;
  font-size: clamp(30px, 6vw, 40px);
  line-height: 1;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 14px;
}

.page-about__commit-card:nth-child(1) .page-about__commit-num {
  color: var(--c-primary);
}

.page-about__commit-card:nth-child(2) .page-about__commit-num {
  color: var(--c-deep);
}

.page-about__commit-card:nth-child(3) .page-about__commit-num {
  color: var(--c-primary-deep);
}

.page-about__commit-card:nth-child(4) .page-about__commit-num {
  color: var(--c-gray-blue);
}

.page-about__commit-card:nth-child(5) .page-about__commit-num {
  color: var(--c-primary);
}

.page-about__commit-card:nth-child(6) .page-about__commit-num {
  color: var(--c-deep);
}

.page-about__commit-title {
  font-family: var(--font-headline);
  font-size: 18px;
  color: var(--c-dark-gray);
  margin: 0 0 8px;
  letter-spacing: 0.02em;
}

.page-about__commit-card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-gray-blue);
  margin-bottom: 0;
}

.page-about__commit-foot {
  margin: 24px 0 0;
  font-size: 13px;
  color: var(--c-gray-blue);
}

.page-about__commit-foot a {
  color: var(--c-primary);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about__commit-foot a:hover {
  color: var(--c-primary-deep);
}

.page-about__snapshot-figure img,
.page-about__pipeline-visual img,
.page-about__milestones-bg img {
  max-width: 100%;
}

@media (min-width: 480px) {
  .page-about__pipe-cards {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__pipe-card:last-child {
    grid-column: 1 / -1;
  }

  .page-about__commit-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__hero-frame {
    padding: 48px 40px;
  }

  .page-about__hero-stats {
    gap: 20px;
  }
}

@media (min-width: 768px) {
  .page-about {
    --_x-pad: 28px;
  }

  .page-about__hero {
    padding: 64px var(--_x-pad) 56px;
  }

  .page-about__hero-frame {
    padding: 56px 48px;
  }

  .page-about .page-desc {
    font-size: 16px;
  }

  .page-about__exhibit {
    display: grid;
    grid-template-columns: var(--_plaque-w) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
    padding-top: 36px;
    padding-bottom: 40px;
  }

  .page-about__plaque {
    margin: -96px 0 0;
    max-width: none;
    position: sticky;
    top: 24px;
    padding: 28px 24px;
  }

  .page-about__exhibit-main {
    padding-top: 8px;
  }

  .page-about__snapshot-grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 32px;
  }

  .page-about__snapshot-content p {
    font-size: 15px;
  }

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

  .page-about__pipe-card:last-child {
    grid-column: auto;
  }

  .page-about__timeline {
    padding-left: 24px;
  }

  .page-about__timeline::before {
    left: 34px;
  }

  .page-about__timeline-item {
    grid-template-columns: 52px 1fr;
    gap: 24px;
  }

  .page-about__timeline-panel {
    padding: 24px;
  }

  .page-about__commitments {
    padding: 40px 30px;
  }

  .page-about__commit-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --_x-pad: 36px;
  }

  .page-about__hero {
    padding: 72px var(--_x-pad) 64px;
  }

  .page-about__hero-frame {
    padding: 64px 64px;
    max-width: 980px;
  }

  .page-about__hero .page-desc {
    font-size: 17px;
    max-width: 44em;
  }

  .page-about__exhibit {
    gap: 56px;
  }

  .page-about__plaque {
    padding: 32px 28px;
  }

  .page-about__snapshot-content p {
    font-size: 16px;
  }

  .page-about__pipe-card h3 {
    font-size: 26px;
  }

  .page-about__timeline-item {
    gap: 32px;
  }

  .page-about__timeline-title {
    font-size: 24px;
  }

  .page-about__commit-grid {
    gap: 20px;
  }
}