.page-about {
  --about-line: #D8D0C0;
  --about-ink: #1F2937;
  --about-blue: #1E3A8A;
  --about-yellow: #F59E0B;
  background-color: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-about .container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

.page-about .breadcrumb {
  padding-top: 18px;
  font-size: 14px;
  font-family: var(--font-mono);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 6px;
}

.page-about .breadcrumb__item {
  color: var(--color-text-muted);
}

.page-about .breadcrumb__item a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration) var(--easing), color var(--duration) var(--easing);
}

.page-about .breadcrumb__item a:hover {
  color: var(--color-primary-deep);
  border-bottom-color: var(--color-primary);
}

.page-about .breadcrumb__item.is-current {
  color: var(--color-primary-deep);
  font-weight: 600;
}

/* Hero */
.page-about .about-hero {
  padding: 48px 0 56px;
  position: relative;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-primary);
  background: var(--color-white);
  border: 1px solid var(--about-line);
  padding: 6px 14px;
  border-left: 4px solid var(--color-primary);
  margin-bottom: 20px;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 5.6vw, 54px);
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: 0.01em;
  color: var(--color-primary-deep);
}

.page-about .about-hero__title-accent {
  display: block;
  color: var(--color-primary);
}

.page-about .about-hero__lead {
  font-size: 16px;
  color: var(--color-text-muted);
  max-width: 620px;
  margin-bottom: 28px;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__meta-item {
  display: inline-flex;
  align-items: center;
  background: var(--color-white);
  border: 1px solid var(--about-line);
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-primary-deep);
}

/* Hero diagram */
.page-about .about-hero__diagram {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 220px;
}

.page-about .hero-diagram {
  position: relative;
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--about-line);
  background: var(--color-white);
  padding: 20px;
}

.page-about .hero-diagram__svg {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin: 0 auto;
}

.page-about .hero-diagram__node {
  position: absolute;
  width: 12px;
  height: 12px;
}

.page-about .hero-diagram__node--start {
  left: 12%;
  bottom: 18px;
  background: var(--color-primary);
}

.page-about .hero-diagram__node--end {
  right: 12%;
  bottom: 38px;
  background: var(--color-yellow, #F59E0B);
}

.page-about .hero-diagram__line {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 23px;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--about-line) 0 6px, transparent 6px 12px);
}

/* Story */
.page-about .about-story {
  padding: 24px 0 64px;
  border-top: 3px solid var(--color-primary);
  background: var(--color-white);
}

.page-about .about-story__head,
.page-about .about-timeline__head,
.page-about .about-team__head,
.page-about .about-honors__head {
  margin-bottom: 40px;
}

.page-about .section__title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 3.6vw, 34px);
  color: var(--color-primary-deep);
  margin-bottom: 8px;
}

.page-about .section__lead {
  color: var(--color-text-muted);
  font-size: 16px;
  margin: 0;
  max-width: 640px;
}

.page-about .about-story__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-story__block {
  border: 1px solid var(--color-gray-border);
  background: var(--color-paper);
  padding: 24px;
  border-left: 4px solid var(--about-blue);
  position: relative;
}

.page-about .about-story__block--end {
  border-left-color: var(--about-yellow);
}

.page-about .story-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  margin-bottom: 14px;
  border: 1px solid currentColor;
}

.page-about .story-tag--blue {
  color: var(--color-primary);
  background: var(--color-info);
  border-color: transparent;
}

.page-about .story-tag--yellow {
  color: var(--color-primary-deep);
  background: var(--color-accent-soft);
  border-color: transparent;
}

.page-about .about-story__heading {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--color-primary-deep);
}

.page-about .about-story__text {
  font-size: 16px;
  color: var(--color-text);
  margin: 0;
}

/* Timeline */
.page-about .about-timeline {
  padding: 64px 0;
}

.page-about .about-timeline__chart {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  background: var(--color-white);
  margin-bottom: 48px;
}

.page-about .timeline-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline__list::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--about-line);
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 16px;
  padding-left: 48px;
}

.page-about .timeline__toggle {
  display: flex;
  align-items: center;
  width: 100%;
  text-align: left;
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  padding: 14px 16px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: background var(--duration) var(--easing), box-shadow var(--duration) var(--easing);
}

.page-about .timeline__toggle:hover {
  background: var(--color-gray-soft);
  box-shadow: 0 2px 8px rgba(15, 31, 75, 0.08);
}

.page-about .timeline__toggle[aria-expanded="true"] {
  border-left: 4px solid var(--color-primary);
}

.page-about .timeline__badge {
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--color-primary);
  margin-right: 16px;
  min-width: 54px;
}

.page-about .timeline__label {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-deep);
  margin-right: 12px;
}

.page-about .timeline__count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-muted);
  margin-right: 12px;
  white-space: nowrap;
}

.page-about .timeline__signal {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--color-accent);
  font-weight: 700;
}

.page-about .timeline__detail {
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-top: none;
  padding: 16px 20px;
  font-size: 15px;
  color: var(--color-text);
}

.page-about .timeline__detail p {
  margin: 0;
}

.page-about .timeline__detail[hidden] {
  display: none;
}

.page-about .timeline__legend {
  display: flex;
  justify-content: flex-start;
  margin-top: 8px;
}

.page-about .timeline__legend-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
  border-left: 3px solid var(--color-accent);
  padding-left: 8px;
}

.page-about .timeline-side {
  margin-top: 8px;
}

.page-about .timeline-side__card {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 24px;
}

.page-about .timeline-side__label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-soft);
  margin-bottom: 6px;
  letter-spacing: 0.1em;
}

.page-about .timeline-side__value {
  font-family: var(--font-heading);
  font-size: 64px;
  line-height: 1.1;
  margin-bottom: 16px;
  color: var(--color-accent);
}

.page-about .timeline-side__unit {
  font-size: 18px;
  margin-left: 6px;
  color: var(--color-white);
}

.page-about .timeline-side__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline-side__list li {
  position: relative;
  padding: 6px 0 6px 16px;
  font-size: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.page-about .timeline-side__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
}

/* Team */
.page-about .about-team {
  padding: 64px 0;
  background: var(--color-gray-soft);
  border-top: 1px solid var(--color-gray-border);
  border-bottom: 1px solid var(--color-gray-border);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.page-about .about-team__panel {
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  border-top: 4px solid var(--color-primary);
  padding: 20px;
}

.page-about .about-team__panel:nth-child(2) {
  border-top-color: var(--color-accent);
}

.page-about .about-team__code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.page-about .about-team__heading {
  font-size: 19px;
  margin: 0 0 8px;
  color: var(--color-primary-deep);
}

.page-about .about-team__text {
  font-size: 15px;
  color: var(--color-text-muted);
  margin: 0;
}

.page-about .about-team__diagram {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-line);
  background: var(--color-white);
  margin: 0 auto;
}

/* Honors */
.page-about .about-honors {
  padding: 64px 0;
}

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

.page-about .honor-card {
  display: flex;
  align-items: center;
  background: var(--color-white);
  border: 1px solid var(--color-gray-border);
  padding: 20px;
  gap: 20px;
}

.page-about .honor-card__icon {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border: 1px solid var(--color-gray-border);
  flex-shrink: 0;
}

.page-about .honor-card__emblem {
  width: 96px;
  height: 96px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  font-size: 48px;
  color: var(--color-primary);
  border: 2px solid var(--color-accent);
}

.page-about .honor-card__type {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--color-info);
  color: var(--color-primary);
  padding: 3px 8px;
  margin-bottom: 8px;
}

.page-about .honor-card__title {
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--color-primary-deep);
}

.page-about .honor-card__text {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 0;
}

/* Commitment */
.page-about .about-commit {
  padding: 80px 0;
  background: var(--color-primary);
  color: var(--color-white);
}

.page-about .about-commit__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about .about-commit__title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 3.6vw, 34px);
  color: var(--color-white);
  margin-bottom: 8px;
}

.page-about .about-commit__lead {
  color: var(--color-info);
  font-size: 16px;
  margin-bottom: 32px;
}

.page-about .about-commit__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-commit__item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .about-commit__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 700;
  min-width: 24px;
}

.page-about .about-commit__heading {
  font-size: 17px;
  margin: 0 0 4px;
  color: var(--color-white);
}

.page-about .about-commit__text p {
  margin: 0;
  font-size: 14px;
  color: var(--color-info);
}

.page-about .about-commit__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--duration) var(--easing), color var(--duration) var(--easing), border-color var(--duration) var(--easing);
}

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

.page-about .btn--accent:hover {
  background: #e08e0a;
}

.page-about .btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--color-white);
}

.page-about .btn--ghost:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.08);
}

.page-about .about-commit__aside {
  margin-top: 8px;
}

.page-about .commit-panel {
  background: var(--color-primary-deep);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 24px;
}

.page-about .commit-panel__label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.page-about .commit-panel__version {
  font-family: var(--font-heading);
  font-size: 48px;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: 6px;
}

.page-about .commit-panel__desc {
  color: var(--color-white);
  font-size: 15px;
  margin-bottom: 16px;
}

.page-about .commit-panel__meta {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .commit-panel__meta li {
  padding: 6px 0;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-info);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.page-about .commit-panel__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-white);
}

.page-about .status-dot {
  width: 10px;
  height: 10px;
  background: var(--color-accent);
  display: inline-block;
}

/* CTA */
.page-about .about-cta {
  padding: 64px 0;
  background: var(--color-accent-soft);
}

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

.page-about .about-cta__title {
  font-family: var(--font-heading);
  font-size: clamp(22px, 3vw, 30px);
  color: var(--color-primary-deep);
  margin: 0 0 8px;
}

.page-about .about-cta__desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 16px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-about .about-cta .btn--ghost {
  background: var(--color-white);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-about .about-cta .btn--ghost:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

@media (min-width: 768px) {
  .page-about .container {
    padding-left: 24px;
    padding-right: 24px;
  }

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

  .page-about .about-hero__inner {
    grid-template-columns: 1.2fr 0.8fr;
  }

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

  .page-about .timeline-wrap {
    grid-template-columns: 1.6fr 0.8fr;
  }

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

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

  .page-about .about-commit__panel {
    grid-template-columns: 1.4fr 0.8fr;
  }

  .page-about .about-cta__inner {
    grid-template-columns: 1fr auto;
  }

  .page-about .timeline__list::before {
    left: 20px;
  }

  .page-about .timeline__item {
    padding-left: 56px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__title {
    font-size: 56px;
  }
}

.page-about {
  --color-yellow: transparent;
}