.page-about {
  --color-primary: #0A1F3F;
  --color-primary-dark: #051220;
  --color-primary-light: #1A2F4F;
  --color-accent: #39FF14;
  --color-secondary: #C0C0C0;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #AABBCC;
  --font-heading: 'Montserrat', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 1200px;
  --container-padding: 1rem;
  --transition-base: 0.35s ease;
  --transition-slow: 0.55s ease;
  --radius-md: 12px;
  --radius-lg: 24px;
  --shadow-soft: 0 8px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 20px rgba(57,255,20,0.15);
  display: block;
  width: 100%;
  max-width: 100%;
  background: var(--color-primary-dark);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.5rem;
  padding: 1rem var(--container-padding);
  max-width: var(--container-max);
  margin: 0 auto;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.page-about .breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-accent);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.page-about .breadcrumb-sep {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

.page-about .breadcrumb-current {
  color: var(--color-accent);
  font-weight: 600;
}

.page-about .container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.page-about .section-number {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.7;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.page-about .btn--primary {
  background: var(--color-accent);
  color: var(--color-primary-dark);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background: transparent;
  color: var(--color-accent);
  box-shadow: 0 0 30px rgba(57,255,20,0.3);
  transform: translateY(-2px);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.page-about .tag {
  display: inline-block;
  padding: 0.3rem 1rem;
  border-radius: 100px;
  background: var(--color-primary-light);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-heading);
  letter-spacing: 0.02em;
  border: 1px solid rgba(57,255,20,0.2);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.page-about .tag:hover {
  background: rgba(57,255,20,0.12);
  border-color: var(--color-accent);
}

/* intro */
.page-about__intro {
  padding: 2rem var(--container-padding) 3rem;
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.page-about__intro[data-observe] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.page-about__intro[data-observe].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about__intro-title {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin: 0 0 0.75rem 0;
}

.page-about__intro-desc {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.7;
}

/* brand story */
.page-about__story {
  width: 100%;
  padding: 0 var(--container-padding) 3rem;
}

.page-about__story[data-observe] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.page-about__story[data-observe].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about__story-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.page-about__story-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 60%, rgba(57,255,20,0.08) 100%);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 0 92%);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about__story-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  mix-blend-mode: overlay;
  opacity: 0.7;
}

.page-about__story-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about__story-heading {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin: 0;
}

.page-about__story-text {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 640px;
  margin: 0;
}

.page-about__story-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  padding: 0;
  margin: 0.5rem 0 0 0;
}

/* core values */
.page-about__values {
  padding: 3rem var(--container-padding) 4rem;
  position: relative;
  background: linear-gradient(180deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
}

.page-about__values[data-observe] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.page-about__values[data-observe].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about__values .container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about__values .section-number {
  font-size: 4.5rem;
}

.page-about__values-heading {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin: 0;
}

.page-about__values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__value-card {
  perspective: 800px;
  height: 260px;
  border-radius: var(--radius-md);
  background: transparent;
  cursor: default;
}

.page-about__value-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform var(--transition-slow);
  transform-style: preserve-3d;
  border-radius: var(--radius-md);
}

.page-about__value-card:hover .page-about__value-card-inner,
.page-about__value-card:focus-visible .page-about__value-card-inner {
  transform: rotateY(180deg);
}

.page-about__value-front,
.page-about__value-back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid rgba(192,192,192,0.12);
  box-shadow: var(--shadow-soft);
}

.page-about__value-front {
  background: linear-gradient(145deg, var(--color-primary-light), var(--color-primary-dark));
  color: var(--color-text-primary);
  align-items: flex-start;
  gap: 0.75rem;
}

.page-about__value-back {
  background: linear-gradient(145deg, var(--color-primary-dark), var(--color-primary-light));
  color: var(--color-text-secondary);
  transform: rotateY(180deg);
  align-items: center;
  text-align: center;
  border-color: rgba(57,255,20,0.25);
}

.page-about__value-icon {
  font-size: 2.2rem;
  line-height: 1;
  display: block;
}

.page-about__value-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-accent);
  margin: 0;
}

.page-about__value-brief {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

.page-about__value-detail {
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
  max-width: 280px;
}

.page-about__values-visual {
  margin-top: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-primary);
  max-height: 300px;
}

.page-about__values-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.6;
  mix-blend-mode: screen;
}

/* contact */
.page-about__contact {
  padding: 3rem var(--container-padding) 4rem;
}

.page-about__contact[data-observe] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.page-about__contact[data-observe].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about__contact-layout {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.page-about__contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about__contact-info .section-number {
  font-size: 4rem;
}

.page-about__contact-heading {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin: 0;
}

.page-about__contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem 1.5rem;
  margin: 0.5rem 0 0 0;
}

.page-about__contact-term {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0;
}

.page-about__contact-def {
  font-size: 1rem;
  color: var(--color-text-primary);
  margin: 0 0 0.75rem 0;
  line-height: 1.5;
}

.page-about__contact-note {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 500px;
  margin: 0.5rem 0 0 0;
}

.page-about__contact .btn {
  align-self: flex-start;
  margin-top: 0.5rem;
}

.page-about__contact-map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-primary);
  max-height: 350px;
}

.page-about__map-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.65;
  mix-blend-mode: screen;
}

/* trust */
.page-about__trust {
  padding: 1.5rem var(--container-padding) 2.5rem;
  border-top: 1px solid rgba(192,192,192,0.1);
}

.page-about__trust[data-observe] {
  opacity: 0;
  transition: opacity 0.6s ease;
}

.page-about__trust[data-observe].is-visible {
  opacity: 1;
}

.page-about__trust-text {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  opacity: 0.7;
  text-align: center;
  margin: 0;
  line-height: 1.6;
  max-width: 720px;
  margin: 0 auto;
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  .page-about__intro[data-observe],
  .page-about__story[data-observe],
  .page-about__values[data-observe],
  .page-about__contact[data-observe],
  .page-about__trust[data-observe] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about__value-card-inner {
    transition: none;
    transform: none;
  }

  .page-about__value-card:hover .page-about__value-card-inner,
  .page-about__value-card:focus-visible .page-about__value-card-inner {
    transform: none;
  }

  .page-about__value-back {
    transform: none;
    position: static;
    backface-visibility: visible;
    -webkit-backface-visibility: visible;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    border-top: 1px solid rgba(57,255,20,0.2);
  }

  .page-about__value-front {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  .page-about__value-card {
    height: auto;
    perspective: none;
  }

  .page-about__value-card-inner {
    display: flex;
    flex-direction: column;
    height: auto;
  }

  .page-about__value-card:hover .page-about__value-back,
  .page-about__value-card:focus-visible .page-about__value-back {
    background: var(--color-primary-light);
  }
}

/* tablet & up */
@media (min-width: 640px) {
  .page-about__intro-title {
    font-size: 3.5rem;
  }

  .page-about__story-inner {
    flex-direction: row;
    align-items: stretch;
    gap: 2.5rem;
  }

  .page-about__story-visual {
    flex: 1 1 45%;
    min-height: 400px;
    clip-path: polygon(0 0, 100% 0, 92% 100%, 0 88%);
  }

  .page-about__story-content {
    flex: 1 1 50%;
    justify-content: center;
    padding: 1rem 0;
  }

  .page-about__story-heading {
    font-size: 2.4rem;
  }

  .page-about__values-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }

  .page-about__value-card {
    height: 300px;
  }

  .page-about__values-heading {
    font-size: 2.6rem;
  }

  .page-about__contact-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }

  .page-about__contact-info {
    flex: 1 1 50%;
  }

  .page-about__contact-map {
    flex: 1 1 45%;
    max-height: 380px;
  }

  .page-about__contact-heading {
    font-size: 2.4rem;
  }

  .page-about__contact-list {
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1.5rem;
  }

  .page-about__contact-term {
    text-align: right;
    margin: 0;
  }

  .page-about__contact-def {
    margin: 0;
  }
}

/* desktop */
@media (min-width: 1024px) {
  .page-about__intro {
    padding: 3rem var(--container-padding) 4.5rem;
  }

  .page-about__intro-title {
    font-size: 4.5rem;
  }

  .page-about__intro-desc {
    font-size: 1.25rem;
  }

  .page-about__story {
    padding: 0 var(--container-padding) 5rem;
  }

  .page-about__story-visual {
    clip-path: polygon(0 0, 100% 0, 88% 100%, 0 85%);
  }

  .page-about__story-heading {
    font-size: 2.8rem;
  }

  .page-about__story-text {
    font-size: 1.05rem;
  }

  .page-about__values {
    padding: 5rem var(--container-padding) 6rem;
  }

  .page-about__values .section-number {
    font-size: 5.5rem;
  }

  .page-about__values-heading {
    font-size: 3rem;
  }

  .page-about__value-card {
    height: 340px;
  }

  .page-about__value-front,
  .page-about__value-back {
    padding: 2.25rem 2rem;
  }

  .page-about__value-title {
    font-size: 1.75rem;
  }

  .page-about__contact {
    padding: 5rem var(--container-padding) 6rem;
  }

  .page-about__contact-heading {
    font-size: 2.8rem;
  }

  .page-about__contact-info .section-number {
    font-size: 5rem;
  }
}