.page-about {
  --about-year-width: 76px;
  --about-marker-col: 28px;
  --about-gap: 14px;
  position: relative;
}

.page-about > * {
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

.page-about .section-block {
  margin-top: clamp(64px, 10vw, 120px);
}

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

.page-about .section-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  line-height: 1.2;
  margin-top: 12px;
  letter-spacing: .01em;
}

.page-about .section-head .chip-tag {
  display: inline-flex;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 20px;
  color: var(--text-secondary);
  font-size: 14px;
}

.page-about .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 0;
  border-radius: 6px;
  transition: color var(--ease-out);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--accent-green);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about-intro {
  position: relative;
  padding-top: clamp(32px, 7vh, 80px);
  overflow: hidden;
}

.page-about-intro::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 226, 122, .16) 0%, transparent 70%);
  pointer-events: none;
}

.page-about-intro h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  max-width: 900px;
  margin: 0 0 24px;
  letter-spacing: .02em;
  color: var(--text-main);
}

.page-about-intro p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
  max-width: 780px;
  margin-bottom: 18px;
}

.page-about-intro strong {
  color: var(--text-main);
  font-weight: 700;
}

.page-about-intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about .btn,
.page-about .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--ease-out), box-shadow var(--ease-out), background-color var(--ease-out), border-color var(--ease-out);
}

.page-about .btn {
  background: var(--gradient-accent);
  color: var(--bg-deep);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-green);
}

.page-about .btn-secondary {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.page-about .btn-secondary:hover,
.page-about .btn-secondary:focus-visible {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: rgba(0, 226, 122, .08);
}

.page-about-milestones-figure {
  margin: 0 0 44px;
  max-width: 840px;
}

.page-about-milestones-figure figcaption,
.page-about-cert-figure figcaption {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 8px;
}

.page-about-timeline-list {
  position: relative;
  display: grid;
  gap: 24px;
}

.page-about-timeline-list::before {
  content: "";
  position: absolute;
  left: calc(var(--about-year-width) + var(--about-gap) + (var(--about-marker-col) / 2) - 1px);
  top: 32px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, rgba(0, 226, 122, .5) 0%, rgba(0, 226, 122, .22) 60%, rgba(255, 122, 0, .25) 100%);
}

.page-about-tl-item {
  display: grid;
  grid-template-columns: var(--about-year-width) var(--about-marker-col) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about-tl-marker {
  grid-column: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 8px;
}

.page-about-tl-year {
  font-family: var(--font-number);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-green);
  letter-spacing: .08em;
  white-space: nowrap;
  margin-bottom: 12px;
  transition: color var(--ease-out);
}

.page-about-tl-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 0 4px rgba(0, 226, 122, .15), 0 0 18px rgba(0, 226, 122, .45);
  transition: transform var(--ease-out), box-shadow var(--ease-out);
}

.page-about-tl-card {
  grid-column: 3;
  padding: 18px 20px;
  border: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(18, 35, 61, .92) 0%, rgba(18, 35, 61, .62) 100%);
  border-radius: var(--radius-md);
  transition: transform var(--ease-out), border-color var(--ease-out), background var(--ease-out);
}

.page-about-tl-card h3 {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  margin: 0 0 6px;
  letter-spacing: .01em;
  color: var(--text-main);
}

.page-about-tl-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: .9375rem;
  line-height: 1.6;
}

.page-about-tl-item:hover .page-about-tl-card,
.page-about-tl-item:focus-within .page-about-tl-card {
  border-color: var(--border-green);
  background: linear-gradient(180deg, var(--bg-hover) 0%, rgba(18, 35, 61, .8) 100%);
  transform: translateY(-3px);
}

.page-about-tl-item:hover .page-about-tl-dot,
.page-about-tl-item:focus-within .page-about-tl-dot {
  transform: scale(1.18);
  box-shadow: 0 0 0 6px rgba(0, 226, 122, .22), 0 0 22px rgba(0, 226, 122, .6);
}

.page-about-tl-item:hover .page-about-tl-year,
.page-about-tl-item:focus-within .page-about-tl-year {
  color: var(--text-main);
}

.page-about-team-grid {
  display: grid;
  gap: 32px;
}

.page-about-team-copy p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.page-about-team-copy h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  margin: 28px 0 12px;
  color: var(--text-main);
}

.page-about-data-bar {
  margin: 24px 0 8px;
}

.page-about-data-fill {
  display: block;
  height: 32px;
  border-radius: 999px;
  background: var(--gradient-accent);
  color: var(--bg-deep);
  font-family: var(--font-number);
  font-weight: 800;
  font-size: .875rem;
  line-height: 32px;
  text-align: center;
  max-width: 100%;
}

.page-about-bar-caption {
  color: var(--text-secondary);
  font-size: 13px;
  margin-top: 4px;
}

.page-about-technical-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 10px;
}

.page-about-technical-list li {
  position: relative;
  padding-left: 24px;
  color: var(--text-main);
  font-size: .9375rem;
  line-height: 1.5;
}

.page-about-technical-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent-green);
  box-shadow: 0 0 10px rgba(0, 226, 122, .6);
}

.page-about-team-visual {
  min-width: 0;
}

.page-about-visual-frame {
  background: var(--bg-panel);
  padding: 6px;
  border-radius: calc(var(--radius-lg) + 6px);
  border: 1px solid var(--border-subtle);
}

.page-about-visual-frame img {
  width: 100%;
}

.page-about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 44px;
}

.page-about-stat {
  padding: 22px 18px;
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--ease-out), transform var(--ease-out);
}

.page-about-stat:hover,
.page-about-stat:focus-within {
  border-color: var(--border-green);
  transform: translateY(-3px);
}

.page-about-stat-num {
  display: block;
  font-family: var(--font-number);
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--accent-green);
}

.page-about-stat-label {
  display: block;
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.4;
}

.page-about-cert-layout {
  display: grid;
  gap: 32px;
}

.page-about-cert-list {
  display: grid;
  gap: 16px;
}

.page-about-cert-item {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
  transition: border-color var(--ease-out);
}

.page-about-cert-item[open] {
  border-color: var(--border-green);
}

.page-about-cert-item summary {
  display: grid;
  grid-template-columns: 56px 1fr 24px;
  gap: 16px;
  align-items: center;
  padding: 22px 24px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--text-main);
}

.page-about-cert-item summary::-webkit-details-marker {
  display: none;
}

.page-about-cert-item summary::marker {
  display: none;
}

.page-about-cert-item[open] summary {
  border-bottom: 1px solid var(--border-subtle);
}

.page-about-cert-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 20px;
  background: rgba(0, 226, 122, .12);
  border: 1px solid var(--border-green);
  color: var(--accent-green);
  font-family: var(--font-number);
  font-weight: 800;
  font-size: 18px;
}

.page-about-cert-badge-award {
  background: rgba(255, 122, 0, .1);
  border-color: var(--border-orange);
  color: var(--accent-orange);
}

.page-about-cert-copy {
  display: flex;
  flex-direction: column;
}

.page-about-cert-copy strong {
  font-size: 1rem;
  letter-spacing: .01em;
}

.page-about-cert-type {
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 400;
}

.page-about-cert-arrow {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
  transition: transform var(--ease-out), color var(--ease-out);
}

.page-about-cert-item[open] .page-about-cert-arrow {
  transform: rotate(180deg);
  color: var(--accent-green);
}

.page-about-cert-detail {
  padding: 16px 24px 22px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.page-about-cert-detail p {
  margin: 0;
}

.page-about-cert-figure {
  margin: 0;
  max-width: 480px;
}

.page-about-eco-grid {
  display: grid;
  gap: 16px;
}

.page-about-eco-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  transition: transform var(--ease-out), border-color var(--ease-out);
}

.page-about-eco-card:hover,
.page-about-eco-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--border-orange);
}

.page-about-eco-card h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  margin: 0 0 10px;
  color: var(--text-main);
}

.page-about-eco-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: .9375rem;
  line-height: 1.7;
}

.page-about-eco-note {
  margin-top: 20px;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-green);
  background: rgba(0, 226, 122, .06);
  color: var(--text-secondary);
  font-size: .9375rem;
  line-height: 1.7;
}

.page-about-eco-note p {
  margin: 0;
}

.page-about-eco-note a {
  color: var(--accent-green);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease-out);
}

.page-about-eco-note a:hover,
.page-about-eco-note a:focus-visible {
  border-bottom-color: var(--accent-green);
}

.page-about-more {
  margin-top: clamp(64px, 10vw, 120px);
  padding: clamp(24px, 5vw, 48px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-green);
  background: linear-gradient(135deg, var(--bg-panel) 30%, rgba(26, 46, 79, .85) 100%);
}

.page-about-more h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 12px;
  color: var(--text-main);
}

.page-about-more p {
  color: var(--text-secondary);
  font-size: .9375rem;
  line-height: 1.7;
  max-width: 680px;
  margin: 0;
}

.page-about-more-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

@media (min-width: 720px) {
  .page-about-tl-item {
    grid-template-columns: 1fr 96px 1fr;
    grid-template-areas: "card marker gap";
    gap: var(--about-gap);
  }

  .page-about-tl-item:nth-child(even) {
    grid-template-areas: "gap marker card";
  }

  .page-about-tl-marker {
    grid-area: marker;
  }

  .page-about-tl-card {
    grid-area: card;
  }

  .page-about-timeline-list::before {
    left: calc(50% - 1px);
  }

  .page-about-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about-team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about-cert-layout {
    grid-template-columns: 1.05fr .95fr;
    gap: 40px;
    align-items: start;
  }

  .page-about-eco-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about-stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about-more {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }

  .page-about-more-actions {
    flex-shrink: 0;
    margin-top: 0;
  }
}