.page-about {
  --about-section-gap: 5rem;
  --about-padding-inline: clamp(1.5rem, 4vw, 3rem);
  --about-narrow-max: 42rem;
  --about-wide-max: 64rem;
  --about-label-color: var(--color-neon, #00F5D4);
  --about-accent-line: var(--color-red, #E63946);
  --about-card-radius: 12px;
  --about-transition: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  --about-column-gap: 2.5rem;
  --about-grid-gap: 1.75rem;
  --about-story-bg: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, rgba(230,57,70,0.06) 100%);
  --about-cta-gradient: linear-gradient(145deg, var(--color-red, #E63946) 0%, var(--color-blue, #1D3557) 100%);
}

.page-about .about-container {
  padding: 2rem var(--about-padding-inline) 4rem;
  position: relative;
  z-index: 1;
}

/* breadcrumb */
.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  font-size: 0.85rem;
  opacity: 0.65;
}

.page-about .about-breadcrumb a {
  color: var(--color-mid, #8D99AE);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--color-neon, #00F5D4);
}

.page-about .breadcrumb-sep {
  color: var(--color-mid, #8D99AE);
}

.page-about .about-breadcrumb [aria-current="page"] {
  color: var(--color-white, #FFFFFF);
  font-weight: 500;
}

/* section layout */
.page-about .about-section {
  margin-bottom: var(--about-section-gap);
  scroll-margin-top: 2rem;
}

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

.page-about .section-narrow {
  max-width: var(--about-narrow-max);
}

.page-about .section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono, monospace);
  font-size: 0.9rem;
  color: var(--about-label-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.page-about .index-marker {
  background: var(--color-dark, #2B2D42);
  border: 1px solid var(--about-label-color);
  padding: 0.2rem 0.55rem;
  font-weight: 700;
  font-size: 0.8rem;
  line-height: 1.2;
}

.page-about .label-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--about-label-color) 0%, transparent 100%);
  opacity: 0.35;
}

.page-about .section-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* mission */
.page-about .about-mission .section-content {
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--about-column-gap);
  align-items: center;
}

.page-about .about-mission .content-text {
  flex: 2 1 280px;
}

.page-about .about-mission .content-image {
  flex: 1 1 240px;
}

.page-about .about-mission h1 {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  margin: 0 0 1rem;
  background: linear-gradient(135deg, var(--color-red, #E63946), var(--color-blue, #1D3557));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.page-about .about-mission p {
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 48rem;
}

.page-about .mission-values {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2rem;
  margin-top: 1.5rem;
}

.page-about .value-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 500;
  font-size: 0.95rem;
}

.page-about .value-icon {
  color: var(--color-gold, #F4A261);
  font-size: 1.2rem;
}

.page-about .img-brand {
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: contain;
  border-radius: var(--about-card-radius);
  background: var(--color-dark, #2B2D42);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

/* journey */
.page-about .about-journey {
  position: relative;
}

.page-about .about-journey::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-red, #E63946), var(--color-gold, #F4A261), var(--about-label-color));
  opacity: 0.2;
  border-radius: 2px;
}

.page-about .about-journey h2,
.page-about .about-story h2 {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin: 0 0 1rem;
  line-height: 1.2;
}

.page-about .version-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.page-about .version-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.page-about .version-tag {
  flex-shrink: 0;
  min-width: 4.5rem;
  padding: 0.3rem 0.6rem;
  font-family: var(--font-mono, monospace);
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--color-dark, #2B2D42);
  border-left: 3px solid var(--color-red, #E63946);
  color: var(--color-white, #FFFFFF);
}

.page-about .version-desc {
  line-height: 1.5;
  font-size: 0.95rem;
  color: var(--color-mid, #8D99AE);
}

/* features grid */
.page-about .about-features .section-content {
  display: flex;
  flex-direction: column;
}

.page-about .about-features h2,
.page-about .about-story h2 {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin: 0 0 1.5rem;
  line-height: 1.2;
}

.page-about .features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--about-grid-gap);
}

.page-about .feature-card {
  background: var(--color-dark, #2B2D42);
  border-radius: var(--about-card-radius);
  overflow: hidden;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  display: flex;
  flex-direction: column;
}

.page-about .feature-card:hover,
.page-about .feature-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(0,245,212,0.15), 0 0 0 1px var(--color-neon, #00F5D4);
}

.page-about .feature-icon {
  overflow: hidden;
  max-height: 220px;
}

.page-about .img-feature {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.page-about .feature-card:hover .img-feature,
.page-about .feature-card:focus-within .img-feature {
  transform: scale(1.04);
}

.page-about .feature-text {
  padding: 1.2rem 1rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-about .feature-text h3 {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: 1.15rem;
  margin: 0;
  line-height: 1.3;
}

.page-about .feature-text p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
  color: var(--color-mid, #8D99AE);
}

/* story */
.page-about .about-story {
  background: var(--about-story-bg);
  border-radius: var(--about-card-radius);
  padding: 2rem var(--about-padding-inline);
  margin-left: calc(-1 * var(--about-padding-inline));
  margin-right: calc(-1 * var(--about-padding-inline));
}

.page-about .story-block {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.page-about .story-block p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0;
}

.page-about .story-tagline {
  font-weight: 600;
  font-size: 1.1rem !important;
  padding-top: 0.5rem;
  border-top: 2px solid var(--color-gold, #F4A261);
  color: var(--color-gold, #F4A261);
}

/* cta */
.page-about .cta-box {
  background: var(--about-cta-gradient);
  border-radius: var(--about-card-radius);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: 0 4px 30px rgba(230,57,70,0.25);
  position: relative;
  overflow: hidden;
}

.page-about .cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(0,245,212,0.1), transparent 60%);
  pointer-events: none;
}

.page-about .cta-box h2 {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: clamp(1.4rem, 4vw, 2rem);
  margin: 0 0 0.75rem;
  line-height: 1.2;
}

.page-about .cta-box p {
  font-size: 1rem;
  margin: 0 0 1.5rem;
  opacity: 0.9;
}

.page-about .btn-cta {
  display: inline-block;
  background: var(--color-white, #FFFFFF);
  color: var(--color-blue, #1D3557);
  padding: 0.75rem 2rem;
  font-weight: 700;
  border-radius: 4px;
  text-decoration: none;
  transition: all var(--transition-med, 0.35s ease);
  position: relative;
  z-index: 1;
}

.page-about .btn-cta:hover,
.page-about .btn-cta:focus-visible {
  background: var(--color-neon, #00F5D4);
  color: var(--color-dark, #2B2D42);
  box-shadow: 0 0 20px var(--color-neon-glow, rgba(0,245,212,0.35));
  transform: scale(1.03);
}

/* responsive */
@media (max-width: 640px) {
  .page-about .about-container {
    padding: 1rem var(--about-padding-inline) 3rem;
  }

  .page-about .about-section {
    margin-bottom: 3rem;
  }

  .page-about .about-mission .section-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .about-mission .content-image {
    width: 100%;
  }

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

  .page-about .feature-icon {
    max-height: 180px;
  }

  .page-about .img-feature {
    height: 180px;
  }

  .page-about .about-story {
    padding: 1.5rem 1rem;
    margin-left: 0;
    margin-right: 0;
    border-radius: 0;
  }

  .page-about .version-list li {
    flex-direction: column;
    gap: 0.3rem;
  }

  .page-about .version-tag {
    min-width: auto;
    width: fit-content;
  }

  .page-about .cta-box {
    padding: 1.75rem 1rem;
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .page-about .about-container {
    padding: 2rem var(--about-padding-inline) 3.5rem;
  }

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

@media (min-width: 1025px) {
  .page-about .about-container {
    padding: 3rem var(--about-padding-inline) 5rem;
  }

  .page-about .about-mission .content-text {
    padding-right: 1rem;
  }

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

/* misc */
.page-about .mono {
  font-family: var(--font-mono, monospace);
}

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