.page-about {
  position: relative;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4) var(--space-8);
  font-family: var(--font-body);
  color: var(--color-ink);
  line-height: 1.7;
}

.page-about::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(15, 76, 129, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 76, 129, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
}

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

.page-about .breadcrumb {
  margin-bottom: var(--space-4);
  font-size: 0.875rem;
  color: var(--color-gray);
}

.page-about .breadcrumb a {
  color: var(--color-primary-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--color-accent-orange);
  text-decoration: underline;
}

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

.page-about__intro {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-line);
}

.page-about__eyebrow {
  margin: 0 0 var(--space-2);
  font-family: var(--font-digit);
  font-size: 0.8125rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-primary-blue);
}

.page-about__intro h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: 2rem;
  line-height: 1.25;
  color: var(--color-primary-blue);
}

.page-about__lead {
  margin: 0;
  max-width: 720px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-gray);
}

.page-about__stages {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: var(--space-6);
  padding-bottom: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about__stages::-webkit-scrollbar {
  display: none;
}

.page-about__stages-label {
  flex-shrink: 0;
  margin: 0;
  font-family: var(--font-digit);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gray);
}

.page-about__stage-link {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--color-line);
  color: var(--color-primary-blue);
  text-decoration: none;
  font-size: 0.875rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about__stage-link:hover,
.page-about__stage-link:focus {
  border-color: var(--color-accent-orange);
  background: rgba(255, 127, 80, 0.06);
}

.page-about__stage-num {
  padding: 1px 4px;
  font-family: var(--font-digit);
  font-size: 0.6875rem;
  line-height: 1.2;
  color: var(--color-highlight-yellow);
  background: var(--color-primary-blue);
}

.page-about__stage-name {
  white-space: nowrap;
}

.page-about .section {
  margin-bottom: var(--space-8);
  scroll-margin-top: 72px;
}

.page-about .section__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.page-about .section__index {
  padding: 2px 8px;
  font-family: var(--font-digit);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--color-highlight-yellow);
  background: var(--color-primary-blue);
}

.page-about .section__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-primary-blue);
}

.page-about .page-about__img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  object-fit: cover;
}

.page-about__philosophy {
  display: grid;
  gap: var(--space-6);
}

.page-about__motto {
  margin: 0 0 var(--space-3);
  padding-left: var(--space-3);
  border-left: 4px solid var(--color-accent-orange);
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary-blue);
}

.page-about__philosophy-text > p {
  margin: 0 0 var(--space-3);
}

.page-about__philosophy-list {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-line);
}

.page-about__philosophy-list li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) 24px;
  border-bottom: 1px solid var(--color-line);
  font-size: 0.9375rem;
}

.page-about__philosophy-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 8px;
  background: var(--color-accent-orange);
  transform: translateY(-50%);
}

.page-about__philosophy-figure {
  margin: 0;
}

.page-about__philosophy-figure figcaption {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-gray);
}

.page-about__milestone-wrap {
  display: grid;
  gap: var(--space-6);
}

.page-about__timeline {
  position: relative;
  padding-left: calc(var(--space-unit) * 5);
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-primary-blue), var(--color-line) 70%, var(--color-highlight-yellow));
}

.page-about__milestone {
  position: relative;
  margin-bottom: var(--space-4);
}

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

.page-about__milestone-node {
  position: absolute;
  left: calc(var(--space-unit) * -5);
  top: 2px;
  width: 28px;
  height: 28px;
}

.page-about__milestone-dot {
  position: absolute;
  left: 5px;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent-orange);
  box-shadow: 0 0 0 4px rgba(255, 127, 80, 0.14);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about__milestone-index {
  position: absolute;
  right: -8px;
  top: -6px;
  z-index: 1;
  padding: 3px 4px;
  font-family: var(--font-digit);
  font-size: 0.625rem;
  line-height: 1;
  color: var(--color-primary-blue);
  background: var(--color-highlight-yellow);
  box-shadow: var(--shadow-panel);
}

.page-about__milestone-card {
  padding: var(--space-4);
  background: var(--color-panel-white);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary-blue);
  box-shadow: var(--shadow-panel);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about__milestone-card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.0625rem;
  color: var(--color-primary-blue);
}

.page-about__milestone-card > p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-gray);
}

.page-about__milestone-more {
  display: block;
  margin-top: var(--space-2);
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-highlight-yellow);
  font-size: 0.8125rem;
  color: var(--color-primary-blue);
  opacity: 0.72;
  transition: opacity 0.25s ease;
}

.page-about__milestone:hover .page-about__milestone-card,
.page-about__milestone:focus-within .page-about__milestone-card {
  border-left-color: var(--color-accent-orange);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.page-about__milestone:hover .page-about__milestone-more,
.page-about__milestone:focus-within .page-about__milestone-more {
  opacity: 1;
}

.page-about__milestone:hover .page-about__milestone-dot,
.page-about__milestone:focus-within .page-about__milestone-dot {
  transform: scale(1.25);
  box-shadow: 0 0 0 6px rgba(255, 127, 80, 0.12);
}

.page-about__milestone-figure {
  margin: 0;
}

.page-about__milestone-figure figcaption {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-gray);
}

.page-about__scale-figure {
  margin: 0 0 var(--space-4);
}

.page-about__scale-figure figcaption {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-gray);
}

.page-about__bars {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-panel-white);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-panel);
}

.page-about__bar-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) 76px;
  align-items: center;
  gap: var(--space-2);
}

.page-about__bar-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-ink);
}

.page-about__bar-track {
  display: block;
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(15, 76, 129, 0.08);
}

.page-about__bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary-blue), var(--color-accent-orange));
  transform-origin: left center;
  animation: page-about-bar-grow 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes page-about-bar-grow {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

@supports (animation-timeline: view()) {
  .page-about__bar-fill {
    animation: page-about-bar-grow linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 90%;
  }
}

.page-about__bar-num {
  font-family: var(--font-digit);
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: right;
  color: var(--color-primary-blue);
}

.page-about__scale-note {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-highlight-yellow);
  font-size: 0.875rem;
  color: var(--color-gray);
}

.page-about__tech {
  padding: var(--space-6);
  background: var(--color-primary-blue);
  border-radius: 4px;
  color: #fff;
}

.page-about__tech-grid {
  display: grid;
  gap: var(--space-4);
}

.page-about__tech-item {
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about__tech-item:hover {
  background: rgba(255, 127, 80, 0.16);
  border-color: var(--color-accent-orange);
}

.page-about__tech-ico {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-bottom: var(--space-2);
  background: var(--color-highlight-yellow);
  color: var(--color-primary-blue);
  font-family: var(--font-digit);
  font-size: 0.8125rem;
  font-weight: 700;
}

.page-about__tech-item h3 {
  margin: 0 0 var(--space-1);
  font-size: 1rem;
  color: #fff;
}

.page-about__tech-item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
}

.page-about__tech-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.page-about__tech-foot p {
  margin: 0;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.78);
}

.page-about__next {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-line);
}

.page-about__next > h2 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-primary-blue);
}

.page-about__next-grid {
  display: grid;
  gap: var(--space-3);
}

.page-about__next-link {
  display: block;
  padding: var(--space-4);
  background: var(--color-panel-white);
  border: 1px solid var(--color-line);
  text-decoration: none;
  box-shadow: var(--shadow-panel);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.page-about__next-link strong {
  display: block;
  font-size: 1rem;
  color: var(--color-primary-blue);
}

.page-about__next-link span {
  display: block;
  margin-top: 2px;
  font-size: 0.8125rem;
  color: var(--color-gray);
}

.page-about__next-link:hover,
.page-about__next-link:focus {
  border-color: var(--color-accent-orange);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

@media (min-width: 768px) {
  .page-about {
    padding: var(--space-4) var(--space-6) var(--space-8);
  }

  .page-about__intro h1 {
    font-size: 2.5rem;
  }

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

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

@media (min-width: 1024px) {
  .page-about {
    padding-top: var(--space-6);
  }

  .page-about__inner {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-about__stages {
    position: sticky;
    top: var(--space-6);
    display: block;
    margin-bottom: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about__stages .page-about__stage-link {
    display: flex;
    margin-bottom: var(--space-1);
  }

  .page-about__philosophy {
    grid-template-columns: 1.1fr 1fr;
    gap: var(--space-8);
  }

  .page-about__milestone-wrap {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: var(--space-8);
  }

  .page-about__milestone-figure {
    position: sticky;
    top: var(--space-8);
    align-self: start;
  }

  .page-about__tech-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__next-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__bar-fill,
  .page-about__milestone-card,
  .page-about__milestone-dot,
  .page-about__next-link {
    animation: none;
    transition: none;
  }
}