.page-about {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 80dvh;
  color: var(--color-metal-silver, #C0C6D9);
  overflow: clip;
}

/* ---------- backdrop ---------- */
.page-about__backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.page-about__backdrop-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  opacity: 0.12;
}
.page-about__backdrop-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 15, 26, 0.84) 0%,
    rgba(10, 15, 26, 0.92) 40%,
    rgba(10, 15, 26, 0.98) 100%
  );
}

/* ---------- breadcrumb ---------- */
.page-about__breadcrumb {
  position: relative;
  z-index: 2;
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem) 0;
  font: var(--font-body, 400 1em/1.6 sans-serif);
  font-size: 0.85em;
  color: var(--color-metal-silver, #C0C6D9);
}
.page-about__breadcrumb a {
  color: var(--color-electric-blue, #00D4FF);
  text-decoration: none;
  transition: color 0.25s;
}
.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus-visible {
  color: var(--color-fluo-green, #39FF14);
  outline: none;
}
.page-about__breadcrumb span[aria-current="page"] {
  color: var(--color-white, #FFFFFF);
  font-weight: 600;
}

/* ---------- hero ---------- */
.page-about__hero {
  position: relative;
  z-index: 2;
  padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem) var(--spacing-xl, 4rem);
  max-width: var(--site-max-width, 1200px);
  margin: 0 auto;
  width: 100%;
}
.page-about__hero .section-label {
  display: inline-block;
  font: var(--font-data, 500 1.1em/1.2 "SF Mono", monospace);
  color: var(--color-electric-blue, #00D4FF);
  letter-spacing: 2px;
  margin-bottom: var(--spacing-sm, 0.5rem);
  border-bottom: 1px solid var(--color-electric-blue, #00D4FF);
  padding-bottom: 4px;
}
.page-about__hero-title {
  font: var(--font-heading, 700 1.4em/1.1 sans-serif);
  font-size: clamp(2.4rem, 8vw, 4.8rem);
  color: var(--color-white, #FFFFFF);
  line-height: 1.05;
  margin: var(--spacing-md, 1rem) 0 var(--spacing-xs, 0.25rem);
  letter-spacing: -0.02em;
}
.page-about__hero-subtitle {
  font: var(--font-data, 500 1.1em/1.2 "SF Mono", monospace);
  font-size: 0.9em;
  color: var(--color-fluo-green, #39FF14);
  text-transform: uppercase;
  letter-spacing: 4px;
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-about__hero-description {
  max-width: 620px;
  font: var(--font-body, 400 1em/1.6 sans-serif);
  color: var(--color-metal-silver, #C0C6D9);
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border: 1px solid var(--color-neon-purple, #9B30FF);
  background: rgba(10, 15, 26, 0.6);
}

/* ---------- generic section ---------- */
.page-about__section {
  position: relative;
  z-index: 2;
  padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem);
  max-width: var(--site-max-width, 1200px);
  margin: 0 auto;
  width: 100%;
  border-top: 2px solid var(--color-deep-gray, #1A1F2E);
}
.page-about__section .section-label {
  display: inline-block;
  font: var(--font-data, 500 1.1em/1.2 "SF Mono", monospace);
  color: var(--color-electric-blue, #00D4FF);
  letter-spacing: 2px;
  margin-bottom: var(--spacing-sm, 0.5rem);
  border-bottom: 1px solid var(--color-electric-blue, #00D4FF);
  padding-bottom: 4px;
}
.page-about__section-heading {
  font: var(--font-heading, 700 1.4em/1.1 sans-serif);
  font-size: clamp(1.8rem, 5vw, 3rem);
  color: var(--color-white, #FFFFFF);
  line-height: 1.1;
  margin: var(--spacing-md, 1rem) 0 var(--spacing-lg, 2rem);
}
.page-about__section-intro {
  font: var(--font-body, 400 1em/1.6 sans-serif);
  color: var(--color-metal-silver, #C0C6D9);
  max-width: 600px;
  margin-bottom: var(--spacing-lg, 2rem);
}

/* ---------- philosophy grid ---------- */
.page-about__philosophy-grid {
  --gap: var(--spacing-lg, 2rem);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--gap);
}
.page-about__philosophy-item {
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border: 1px solid var(--color-electric-blue, #00D4FF);
  background: rgba(26, 31, 46, 0.5);
}
.page-about__philosophy-title {
  font: var(--font-heading, 700 1.4em/1.1 sans-serif);
  font-size: 1.2rem;
  color: var(--color-white, #FFFFFF);
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-about__philosophy-text {
  font: var(--font-body, 400 1em/1.6 sans-serif);
  color: var(--color-metal-silver, #C0C6D9);
}

/* ---------- services tabs ---------- */
.page-about__services-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm, 0.5rem);
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-about__tab-btn {
  background: transparent;
  border: 1px solid var(--color-electric-blue, #00D4FF);
  color: var(--color-electric-blue, #00D4FF);
  cursor: pointer;
  transition: background 0.3s, color 0.3s;
  font: var(--font-body, 400 1em/1.6 sans-serif);
  font-weight: 600;
  padding: 0.5rem 1.2rem;
}
.page-about__tab-btn[aria-selected="true"] {
  background: var(--color-electric-blue, #00D4FF);
  color: var(--color-dark-night, #0A0F1A);
}
.page-about__tab-btn:hover,
.page-about__tab-btn:focus-visible {
  background: var(--color-electric-blue, #00D4FF);
  color: var(--color-dark-night, #0A0F1A);
  outline: none;
}
.page-about__tab-panels {
  position: relative;
}
.page-about__tab-panel {
  display: none;
}
.page-about__tab-panel[data-open] {
  display: block;
}
.page-about__tab-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg, 2rem);
  align-items: flex-start;
}
.page-about__tab-text {
  flex: 1 1 280px;
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border: 1px solid var(--color-neon-purple, #9B30FF);
  background: rgba(10, 15, 26, 0.65);
}
.page-about__tab-panel-title {
  font: var(--font-heading, 700 1.4em/1.1 sans-serif);
  color: var(--color-white, #FFFFFF);
  font-size: 1.4rem;
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-about__tab-text p {
  margin-bottom: var(--spacing-md, 1rem);
  font: var(--font-body, 400 1em/1.6 sans-serif);
}
.page-about__tab-img {
  flex: 0 0 auto;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-neon-purple, #9B30FF);
  background: var(--color-deep-gray, #1A1F2E);
  object-fit: contain;
}
.page-about__tab-link {
  display: inline-block;
  margin-top: var(--spacing-sm, 0.5rem);
}

/* ---------- value ---------- */
.page-about__value-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-lg, 2rem);
  margin-bottom: var(--spacing-lg, 2rem);
}
.page-about__value-item {
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border: 1px solid var(--color-fluo-green, #39FF14);
  background: rgba(26, 31, 46, 0.5);
}
.page-about__value-title {
  font: var(--font-heading, 700 1.4em/1.1 sans-serif);
  color: var(--color-fluo-green, #39FF14);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm, 0.5rem);
}
.page-about__value-item p {
  font: var(--font-body, 400 1em/1.6 sans-serif);
  color: var(--color-metal-silver, #C0C6D9);
}
.page-about__value-outro {
  max-width: 680px;
  margin: var(--spacing-lg, 2rem) auto 0;
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border: 1px solid var(--color-electric-blue, #00D4FF);
  background: rgba(10, 15, 26, 0.6);
  font: var(--font-body, 400 1em/1.6 sans-serif);
  text-align: center;
  color: var(--color-white, #FFFFFF);
}

/* ---------- scroll reveal ---------- */
.page-about [data-section-reveal] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.page-about [data-section-reveal][data-visible] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- mobile-first ---------- */
@media (max-width: 640px) {
  .page-about {
    gap: 0;
  }
  .page-about__hero {
    padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem);
  }
  .page-about__hero-title {
    font-size: 2rem;
  }
  .page-about__section {
    padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem);
  }
  .page-about__philosophy-grid,
  .page-about__value-list {
    grid-template-columns: 1fr;
  }
  .page-about__tab-content {
    flex-direction: column;
  }
  .page-about__tab-img {
    width: 100%;
    height: auto;
  }
  .page-about__services-tabs {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about__tab-btn {
    text-align: center;
  }
}

@media (min-width: 768px) {
  .page-about__tab-content {
    flex-direction: row;
  }
  .page-about__tab-text {
    flex: 2 1 320px;
  }
  .page-about__tab-img {
    flex: 0 0 200px;
  }
}