.page-about {
  --sidebar-width: 280px;
  --skill-tree-gap: 1.5rem;
  font-family: var(--font-primary);
}

.about-layout {
  display: flex;
  flex-wrap: wrap;
  gap: var(--content-padding);
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--content-padding);
}

.about-sidebar {
  flex: 0 0 var(--sidebar-width);
  padding: 2rem 1rem;
  background: var(--color-primary-deep-blue);
  color: var(--color-neutral-white);
  border: var(--border-width-thick) solid var(--color-primary-gold);
  box-shadow: var(--shadow-strong);
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  align-self: flex-start;
}

.about-sidebar .color-block {
  margin-bottom: 1.5rem;
  padding: 0.25rem 0.5rem;
  background: var(--color-primary-gold);
  color: var(--color-primary-deep-blue);
  font-weight: 700;
  display: inline-block;
}

.about-sidebar .display-text {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.1;
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
}

.about-sidebar .sidebar__tagline {
  font-size: 1rem;
  color: var(--color-accent-cyan);
  border-bottom: 2px solid var(--color-primary-gold);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.sidebar__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar__links li {
  margin-bottom: 0.75rem;
}

.sidebar__links a {
  color: var(--color-primary-gold);
  text-decoration: none;
  font-weight: 600;
  border-left: 3px solid transparent;
  padding-left: 0.75rem;
  transition: color var(--transition-base), border-color var(--transition-base);
}

.sidebar__links a:hover,
.sidebar__links a:focus-visible {
  color: var(--color-accent-cyan);
  border-color: var(--color-accent-cyan);
}

.about-content {
  flex: 1 1 0;
  min-width: 0;
}

.about-content .breadcrumb {
  margin-bottom: 1.5rem;
}

.brand-hero {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-width-thick) solid var(--color-primary-gold);
  box-shadow: var(--shadow-strong);
  margin-bottom: 2rem;
}

.about-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  color: var(--color-primary-deep-blue);
  margin: 0 0 1rem;
  position: relative;
}

.about-content h1::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-primary-gold);
  margin-top: 0.5rem;
}

.lead {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--color-secondary-dark-ink);
  margin-bottom: 2rem;
  max-width: 65ch;
}

.section {
  margin-bottom: 3rem;
}

.section h2 {
  font-size: 1.8rem;
  color: var(--color-primary-deep-blue);
  border-left: 6px solid var(--color-primary-gold);
  padding-left: 1rem;
  margin-bottom: 1.5rem;
}

.section .card {
  background: var(--color-secondary-warm-paper);
  border: var(--border-width-thick) solid var(--color-primary-deep-blue);
  box-shadow: var(--shadow-strong);
  padding: 1.5rem;
}

.section .card h3 {
  color: var(--color-primary-deep-blue);
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.section .card p {
  margin: 0;
  line-height: 1.6;
  color: var(--color-secondary-dark-ink);
}

.skill-tree {
  display: flex;
  flex-direction: column;
  gap: var(--skill-tree-gap);
  margin: 2rem 0;
}

.skill-tree__node {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-secondary-warm-paper);
  border: var(--border-width-medium) solid var(--color-primary-gold);
  padding: 1rem 1.25rem;
  cursor: default;
  transition: box-shadow var(--transition-base), background var(--transition-base);
}

.skill-tree__node:hover,
.skill-tree__node:focus-within {
  box-shadow: var(--shadow-stronger), 0 0 0 3px var(--color-accent-cyan);
  background: var(--color-neutral-white);
}

.skill-tree__step {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-primary-gold);
  flex-shrink: 0;
  min-width: 2.5rem;
}

.skill-tree__info h4 {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
  color: var(--color-primary-deep-blue);
}

.skill-tree__detail {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-secondary-dark-ink);
  line-height: 1.5;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.skill-tree__node:hover .skill-tree__detail,
.skill-tree__node:focus-within .skill-tree__detail {
  max-height: 100px;
}

.skill-tree-image {
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--border-width-thick) solid var(--color-primary-gold);
  margin-top: 1rem;
}

.commitment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.commitment-item {
  text-align: center;
  padding: 1rem;
}

.commitment-icon {
  width: 100%;
  max-width: 200px;
  height: auto;
  border: var(--border-width-medium) solid var(--color-accent-cyan);
  border-radius: 50%;
  margin-bottom: 1rem;
  object-fit: cover;
}

.card--gold {
  border-color: var(--color-primary-gold);
  box-shadow: var(--shadow-gold);
}

@media (max-width: 768px) {
  .about-layout {
    flex-direction: column;
  }

  .about-sidebar {
    flex: 0 0 auto;
    position: static;
    width: 100%;
    border-width: var(--border-width-medium);
  }

  .about-sidebar .sidebar__links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .about-sidebar .sidebar__links li {
    margin-bottom: 0;
  }

  .about-sidebar .sidebar__links a {
    padding-left: 0.5rem;
  }

  .about-content h1 {
    font-size: 1.8rem;
  }

  .skill-tree__node {
    flex-direction: column;
    align-items: stretch;
  }

  .skill-tree__step {
    font-size: 1.2rem;
  }
}