.page-about {
  --about-hero-min-height: 80vh;
  --about-chapter-number-size: 4rem;
  --about-chapter-number-size-desktop: 6rem;
  --about-gap-mobile: 2.5rem;
  --about-gap-desktop: 4rem;
  color: var(--color-text);
  background-color: var(--color-background);
}

/* ======== HERO ======== */
.page-about .about-hero {
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: center;
  position: relative;
  padding: 2rem 0;
  background: linear-gradient(180deg, #0B1A3B 0%, #0F224A 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -20%;
  width: 70%;
  height: 140%;
  background: radial-gradient(circle at 70% 40%, rgba(139,92,246,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .about-hero-tagline {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  border-left: 3px solid var(--color-primary);
  padding-left: 0.75rem;
  line-height: 1.2;
}

.page-about .about-hero-title {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15em;
}

.page-about .about-hero-title-line {
  display: block;
  font-size: clamp(2.8rem, 10vw, 5.5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #FFFFFF 0%, #FF6B35 80%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero-title-sub {
  display: block;
  font-size: clamp(1.2rem, 3.5vw, 2rem);
  font-weight: 300;
  color: var(--color-muted);
  letter-spacing: 0.15em;
}

.page-about .about-hero-desc {
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-muted);
  margin: 0;
}

.page-about .about-hero-visual {
  margin-top: 0.5rem;
  max-width: 400px;
  border-radius: var(--radius-glass);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
}

.page-about .about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero-skip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 0.5rem;
}

.page-about .about-hero-skip-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-default), border-color var(--transition-default);
  padding-bottom: 0.2em;
}

.page-about .about-hero-skip-link:hover,
.page-about .about-hero-skip-link:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ======== CHAPTERS ======== */
.page-about .about-chapter {
  padding: var(--about-gap-mobile) 0;
  border-top: 1px solid var(--color-glass-border);
  position: relative;
}

.page-about .about-chapter:last-child {
  border-bottom: 1px solid var(--color-glass-border);
}

.page-about .about-chapter-inner {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .about-chapter-number {
  font-size: var(--about-chapter-number-size);
  font-weight: 900;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.25;
  user-select: none;
  display: block;
}

.page-about .about-chapter-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .about-chapter-heading {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text);
}

.page-about .about-chapter-text {
  margin: 0;
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-muted);
}

.page-about .about-chapter-text a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-default);
}

.page-about .about-chapter-text a:hover,
.page-about .about-chapter-text a:focus-visible {
  color: var(--color-primary);
}

.page-about .about-chapter-image-wrapper {
  max-width: 600px;
  border-radius: var(--radius-glass);
  overflow: hidden;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.page-about .about-chapter-image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-chapter-link-meta {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin: 0;
  padding-top: 0.25rem;
}

.page-about .about-chapter-link-meta a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
  transition: color var(--transition-default);
}

.page-about .about-chapter-link-meta a:hover,
.page-about .about-chapter-link-meta a:focus-visible {
  color: var(--color-primary);
}

/* ======== FEATURE LIST ======== */
.page-about .about-feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-feature-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-glass-bg);
  border-radius: var(--radius-glass);
  border: 1px solid var(--color-glass-border);
  backdrop-filter: blur(8px);
  transition: background var(--transition-default), border-color var(--transition-default);
}

.page-about .about-feature-item:hover {
  background: var(--color-glass-hover);
  border-color: rgba(255,107,53,0.2);
}

.page-about .about-feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}

.page-about .about-feature-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-muted);
}

/* ======== DESKTOP ======== */
@media (min-width: 768px) {
  .page-about .about-hero {
    min-height: 85vh;
    padding: 4rem 0;
  }

  .page-about .about-hero-inner {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
  }

  .page-about .about-hero-tagline {
    flex: 0 0 100%;
  }

  .page-about .about-hero-title {
    flex: 1 1 50%;
  }

  .page-about .about-hero-desc {
    flex: 1 1 40%;
    max-width: 28em;
  }

  .page-about .about-hero-visual {
    flex: 0 0 100%;
    max-width: 480px;
    margin-top: 1rem;
  }

  .page-about .about-hero-skip {
    flex: 0 0 100%;
  }

  .page-about .about-chapter {
    padding: var(--about-gap-desktop) 0;
  }

  .page-about .about-chapter-inner {
    flex-direction: row;
    gap: 2.5rem;
    align-items: flex-start;
  }

  .page-about .about-chapter-number {
    font-size: var(--about-chapter-number-size-desktop);
    flex: 0 0 6rem;
    text-align: right;
    opacity: 0.35;
    margin-top: 0.15em;
  }

  .page-about .about-chapter-content {
    flex: 1;
    max-width: 700px;
  }

  .page-about .about-chapter-heading {
    font-size: 2.25rem;
  }

  .page-about .about-feature-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

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