.page-about {
  --about-max: 1040px;
  --about-gap: 1.5rem;
  background: var(--winter);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

.page-about a {
  color: var(--summer);
  text-decoration: none;
}

.page-about a:hover {
  text-decoration: underline;
}

.page-about :focus-visible {
  outline: 3px solid var(--summer);
  outline-offset: 2px;
}

.page-about .about-kicker {
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
  background: rgba(248, 250, 252, 0.88);
  border-bottom: 1px solid var(--line);
}

.page-about .about-crumb a {
  color: var(--muted);
  font-weight: 500;
}

.page-about .about-crumb a:hover {
  color: var(--summer);
  text-decoration: none;
}

.page-about .about-crumb__sep {
  color: var(--line);
  font-weight: 700;
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--night);
  font-weight: 700;
}

.page-about .about-brand {
  padding: 2.5rem 1.25rem 3rem;
  background:
    radial-gradient(ellipse 80% 40% at 20% 0%, rgba(16, 185, 129, 0.18), transparent 70%),
    radial-gradient(ellipse 60% 30% at 90% 10%, rgba(14, 165, 233, 0.16), transparent 70%),
    linear-gradient(180deg, var(--winter) 0%, #f8fafc 75%, #f1f5f9 100%);
}

.page-about .about-brand__head {
  max-width: var(--about-max);
  margin: 0 auto;
}

.page-about .about-brand__head h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2.2rem, 7vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: var(--night);
  background: linear-gradient(115deg, var(--night) 0%, var(--spring) 52%, var(--summer) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-brand__lead {
  max-width: 46rem;
  margin: 0 0 1.75rem;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-version-status {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 1rem;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px -8px rgba(2, 6, 23, 0.12);
}

.page-about .about-version-status__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--spring);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.18);
  animation: about-status-pulse 2.4s ease-in-out infinite;
}

.page-about .about-version-status__text {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-brand__figure {
  margin: 2.25rem auto 0;
  max-width: var(--about-max);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.page-about .about-brand__figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-story {
  max-width: var(--about-max);
  margin: 3rem auto 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-story h2 {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--night);
}

.page-about .about-story__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-story__grid p {
  margin: 0;
  font-size: 0.9875rem;
  color: var(--ink);
}

.page-about .about-story__grid a {
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-milestones {
  background: var(--night);
  color: #cbd5e1;
  padding: 3rem 1.25rem 3.5rem;
  position: relative;
}

.page-about .about-milestones__head {
  max-width: var(--about-max);
  margin: 0 auto 2.25rem;
}

.page-about .about-milestones .about-kicker--light {
  color: #94a3b8;
}

.page-about .about-milestones__head h2 {
  margin: 0 0 1rem;
  font-size: 2rem;
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--winter);
}

.page-about .about-milestones__desc {
  max-width: 42rem;
  margin: 0;
  font-size: 0.9875rem;
  color: #94a3b8;
}

.page-about .about-version-map {
  list-style: none;
  margin: 0 auto;
  padding: 0 0 0 2.5rem;
  max-width: var(--about-max);
  position: relative;
}

.page-about .about-version-map::before {
  content: "";
  position: absolute;
  left: 1.25rem;
  top: 0.75rem;
  bottom: 0.75rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--spring), var(--summer), var(--autumn), var(--winter));
  border-radius: var(--radius-pill);
  opacity: 0.7;
  transform: translateX(-50%);
}

.page-about .milestone {
  margin: 0 0 1.25rem;
}

.page-about .milestone:last-child {
  margin-bottom: 0;
}

.page-about .milestone__dot {
  position: absolute;
  left: 1.25rem;
  top: 1.5rem;
  width: 0.875rem;
  height: 0.875rem;
  background: var(--spring);
  border: 3px solid var(--night);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  transform: translateX(-50%);
  z-index: 2;
}

.page-about .milestone:nth-child(2) .milestone__dot {
  background: var(--summer);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.25);
}

.page-about .milestone:nth-child(3) .milestone__dot {
  background: var(--autumn);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.25);
}

.page-about .milestone:nth-child(4) .milestone__dot {
  background: var(--winter);
  box-shadow: 0 0 0 3px rgba(248, 250, 252, 0.25);
}

.page-about .milestone:nth-child(5) .milestone__dot {
  background: linear-gradient(135deg, var(--spring), var(--summer));
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.28);
}

.page-about .milestone__card {
  background: var(--night-soft);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .milestone__card::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, #34d399, var(--spring));
}

.page-about .milestone:nth-child(2) .milestone__card::before {
  background: linear-gradient(90deg, #38bdf8, var(--summer));
}

.page-about .milestone:nth-child(3) .milestone__card::before {
  background: linear-gradient(90deg, #fbbf24, var(--autumn));
}

.page-about .milestone:nth-child(4) .milestone__card::before {
  background: linear-gradient(90deg, #e2e8f0, var(--winter));
}

.page-about .milestone:nth-child(5) .milestone__card::before {
  background: linear-gradient(90deg, var(--spring), var(--summer), var(--autumn));
}

.page-about .milestone__card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.125rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone__card summary:hover {
  background: rgba(148, 163, 184, 0.08);
}

.page-about .milestone__badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 800;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-pill);
  color: var(--night);
  background: var(--spring);
  line-height: 1.3;
}

.page-about .milestone__badge--summer {
  background: var(--summer);
  color: var(--winter);
}

.page-about .milestone__badge--autumn {
  background: var(--autumn);
  color: var(--night);
}

.page-about .milestone__badge--winter {
  background: var(--winter);
  color: var(--night);
}

.page-about .milestone__badge--current {
  background: linear-gradient(135deg, var(--spring), var(--summer));
  color: var(--winter);
}

.page-about .milestone__title {
  font-weight: 800;
  font-size: 1rem;
  color: var(--winter);
  letter-spacing: -0.01em;
}

.page-about .milestone__arrow {
  margin-left: auto;
  color: var(--muted);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1;
}

.page-about .milestone__arrow::after {
  content: "+";
}

.page-about .milestone__card[open] .milestone__arrow::after {
  content: "−";
  color: var(--spring);
}

.page-about .milestone__card[open] {
  border-color: rgba(16, 185, 129, 0.65);
  box-shadow: 0 14px 36px -18px rgba(16, 185, 129, 0.4);
}

.page-about .milestone:nth-child(2) .milestone__card[open] {
  border-color: rgba(14, 165, 233, 0.65);
  box-shadow: 0 14px 36px -18px rgba(14, 165, 233, 0.4);
}

.page-about .milestone:nth-child(3) .milestone__card[open] {
  border-color: rgba(245, 158, 11, 0.65);
  box-shadow: 0 14px 36px -18px rgba(245, 158, 11, 0.35);
}

.page-about .milestone:nth-child(4) .milestone__card[open] {
  border-color: rgba(248, 250, 252, 0.55);
  box-shadow: 0 14px 36px -18px rgba(248, 250, 252, 0.3);
}

.page-about .milestone:nth-child(5) .milestone__card[open] {
  border-color: rgba(99, 102, 241, 0.6);
  box-shadow: 0 14px 36px -18px rgba(99, 102, 241, 0.4);
}

.page-about .milestone__body {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: #cbd5e1;
}

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

.page-about .about-milestone-links {
  max-width: var(--about-max);
  margin: 2rem auto 0;
  padding-left: 2.5rem;
  font-size: 0.9375rem;
  font-weight: 700;
}

.page-about .about-milestone-links a {
  color: var(--summer);
}

.page-about .about-milestones__figure {
  max-width: var(--about-max);
  margin: 2.5rem auto 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--night-soft);
  box-shadow: 0 24px 48px -24px rgba(2, 6, 23, 0.55);
}

.page-about .about-milestones__figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-promise {
  background:
    radial-gradient(ellipse 55% 35% at 85% 5%, rgba(245, 158, 11, 0.08), transparent 65%),
    var(--winter);
  padding: 3rem 1.25rem;
}

.page-about .about-promise__head {
  max-width: var(--about-max);
  margin: 0 auto 2.25rem;
}

.page-about .about-promise__head h2 {
  margin: 0 0 0.75rem;
  font-size: 1.875rem;
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--night);
}

.page-about .about-promise__lead {
  max-width: 44rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.9875rem;
}

.page-about .about-promise__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.875rem;
  max-width: var(--about-max);
  margin: 0 auto 2rem;
}

.page-about .stats-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.25rem 1rem;
  background: #ffffff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--spring);
  border-radius: var(--radius-md);
}

.page-about .stats-item:nth-child(2) {
  border-top-color: var(--summer);
}

.page-about .stats-item:nth-child(3) {
  border-top-color: var(--autumn);
}

.page-about .stats-item:nth-child(4) {
  border-top-color: var(--night);
}

.page-about .stats-num {
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--night);
}

.page-about .stats-label {
  font-size: 0.8125rem;
  color: var(--muted);
}

.page-about .about-promise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.125rem;
  max-width: var(--about-max);
  margin: 0 auto;
}

.page-about .promise-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem 1.5rem 1.5rem;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .promise-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 36px -22px rgba(2, 6, 23, 0.25);
}

.page-about .promise-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(to bottom, var(--spring), var(--summer));
  border-radius: var(--radius-pill);
}

.page-about .promise-card__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 800;
  color: var(--muted);
}

.page-about .promise-card h3 {
  margin: 0.75rem 0 0.5rem;
  font-size: 1.1875rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--night);
}

.page-about .promise-card p {
  margin: 0 0 1.25rem;
  font-size: 0.9375rem;
  color: var(--ink);
}

.page-about .promise-card__link {
  margin-top: auto;
  font-weight: 700;
  font-size: 0.9375rem;
}

.page-about .about-promise__figure {
  max-width: 44rem;
  margin: 2.5rem auto 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px -22px rgba(2, 6, 23, 0.35);
}

.page-about .about-promise__figure img {
  width: 100%;
  object-fit: cover;
}

@keyframes about-status-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.9;
  }
  50% {
    transform: scale(1.5);
    opacity: 0.5;
  }
}

@media (min-width: 768px) {
  .page-about .about-crumb {
    padding: 0.875rem 2rem;
  }

  .page-about .about-brand,
  .page-about .about-milestones,
  .page-about .about-promise {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .page-about .about-brand {
    padding-top: 3.5rem;
    padding-bottom: 4.5rem;
  }

  .page-about .about-brand__head {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 2.5rem;
    align-items: end;
  }

  .page-about .about-brand__lead {
    margin-bottom: 1.75rem;
  }

  .page-about .about-brand__figure {
    margin-top: 3rem;
  }

  .page-about .about-story {
    grid-template-columns: 0.7fr 1.3fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-story h2 {
    margin: 0;
    font-size: 2.125rem;
  }

  .page-about .about-story__grid {
    gap: 1.25rem;
  }

  .page-about .about-milestones {
    padding-top: 4.5rem;
    padding-bottom: 5rem;
  }

  .page-about .about-milestones__head {
    display: grid;
    grid-template-columns: 0.7fr 1.3fr;
    gap: 2.5rem;
    align-items: end;
    margin-bottom: 3rem;
  }

  .page-about .about-milestones__desc {
    margin: 0;
  }

  .page-about .about-version-map {
    padding-left: 0;
  }

  .page-about .about-version-map::before {
    left: 50%;
  }

  .page-about .milestone {
    width: calc(50% - var(--about-gap));
    margin-bottom: 2rem;
  }

  .page-about .milestone:nth-child(even) {
    margin-left: calc(50% + var(--about-gap));
  }

  .page-about .milestone__dot {
    left: 50%;
  }

  .page-about .milestone__body {
    padding: 0 1.5rem 1.5rem;
  }

  .page-about .milestone__card summary {
    padding: 1.25rem 1.5rem;
  }

  .page-about .about-milestone-links {
    text-align: center;
    padding-left: 0;
    margin-top: 2.5rem;
  }

  .page-about .about-promise {
    padding-top: 4.5rem;
    padding-bottom: 5rem;
  }

  .page-about .about-promise__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2.25rem;
  }

  .page-about .stats-item {
    padding: 1.5rem 1.25rem;
  }

  .page-about .stats-num {
    font-size: 2.25rem;
  }

  .page-about .about-promise__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about .promise-card {
    padding: 2rem 1.75rem 1.75rem;
  }

  .page-about .about-promise__figure {
    margin-top: 3.5rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-crumb {
    padding-left: 3rem;
    padding-right: 3rem;
  }

  .page-about .about-brand,
  .page-about .about-milestones,
  .page-about .about-promise {
    padding-left: 3rem;
    padding-right: 3rem;
  }
}