.page-about {
  --page-accent: var(--accent, #FF6B35);
  --page-primary: var(--primary, #0A1F3D);
  --page-bg-dark: var(--color-bg-dark, #0B0E14);
  --page-surface: var(--color-surface, #1A2332);
  --page-text-secondary: var(--color-text-secondary, #B0B8C4);
  --page-border: var(--color-border, rgba(140, 158, 171, 0.3));
  --page-shadow-md: var(--shadow-md, 0 8px 32px rgba(0,0,0,0.4));
  --page-shadow-lg: var(--shadow-lg, 0 16px 48px rgba(0,0,0,0.5));
  --page-font-heading: var(--font-heading, Georgia, "Times New Roman", serif);
  --page-font-body: var(--font-body, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif);
  --page-gap: var(--gap, 24px);
  --page-border-thick: 4px;
  --page-border-med: 2px;

  display: block;
  background: var(--page-bg-dark);
  color: var(--color-text-primary, #FFFFFF);
  font-family: var(--page-font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Breadcrumb */
.page-about__breadcrumb {
  padding: 16px var(--page-gap) 0;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
}
.page-about__breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--page-text-secondary);
}
.page-about__breadcrumb-item + .page-about__breadcrumb-item::before {
  content: "›";
  margin-right: 8px;
  color: var(--page-accent);
  font-weight: 700;
}
.page-about__breadcrumb-link {
  color: var(--page-text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.page-about__breadcrumb-link:hover,
.page-about__breadcrumb-link:focus {
  color: var(--page-accent);
  border-color: var(--page-accent);
}

/* Cover – magazine style */
.page-about__cover {
  position: relative;
  padding: 40px var(--page-gap) 60px;
  background: var(--page-bg-dark);
  border-bottom: var(--page-border-thick) solid var(--page-accent);
  margin-bottom: 0;
}
.page-about__cover-frame {
  position: relative;
  border: var(--page-border-med) solid var(--page-border);
  padding: 32px 24px;
  background: linear-gradient(135deg, rgba(10,31,61,0.9) 0%, rgba(11,14,20,0.95) 100%);
  box-shadow: var(--page-shadow-lg);
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
}
.page-about__cover-badge {
  display: inline-block;
  font-family: var(--page-font-heading);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--page-accent);
  border: 1px solid var(--page-accent);
  padding: 4px 12px;
  margin-bottom: 20px;
}
.page-about__cover-title {
  font-family: var(--page-font-heading);
  font-size: clamp(2.8rem, 12vw, 5.2rem);
  font-weight: 700;
  line-height: 1.05;
  margin: 0 0 16px;
  color: var(--color-text-primary, #FFFFFF);
  letter-spacing: -0.02em;
  text-shadow: 0 4px 20px rgba(0,0,0,0.6);
  max-width: 900px;
}
.page-about__cover-lede {
  font-size: clamp(1rem, 3vw, 1.25rem);
  color: var(--page-text-secondary);
  max-width: 640px;
  margin: 0 0 28px;
  line-height: 1.5;
  border-left: var(--page-border-thick) solid var(--page-accent);
  padding-left: 20px;
}
.page-about__cover-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 4px;
  align-items: center;
  font-family: var(--page-font-heading);
  font-size: 0.9rem;
}
.page-about__cover-index-link {
  color: var(--color-text-primary, #FFFFFF);
  text-decoration: none;
  padding: 6px 8px;
  border: 1px solid transparent;
  transition: all 0.2s;
  font-weight: 500;
}
.page-about__cover-index-link:hover,
.page-about__cover-index-link:focus {
  color: var(--page-accent);
  border-color: var(--page-accent);
  background: rgba(255,107,53,0.08);
}
.page-about__cover-index-sep {
  color: var(--page-accent);
  font-weight: 700;
  margin: 0 2px;
}

/* Sections general */
.page-about__section {
  padding: 64px var(--page-gap);
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
}
.page-about__section-title {
  font-family: var(--page-font-heading);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  margin: 0 0 16px;
  line-height: 1.2;
  color: var(--color-text-primary, #FFFFFF);
  position: relative;
  display: inline-block;
}
.page-about__section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: var(--page-border-thick);
  background: var(--page-accent);
  margin-top: 8px;
}
.page-about__section-title--center {
  text-align: center;
  display: block;
}
.page-about__section-title--center::after {
  margin-left: auto;
  margin-right: auto;
}

/* Brand position */
.page-about__section--brand {
  background: var(--page-primary);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about__brand-text {
  margin-bottom: 32px;
}
.page-about__brand-desc {
  font-size: 1.05rem;
  color: var(--page-text-secondary);
  margin: 0 0 24px;
  line-height: 1.7;
  max-width: 540px;
}
.page-about__brand-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about__brand-item {
  position: relative;
  padding-left: 28px;
  font-size: 0.95rem;
  color: var(--color-text-primary, #FFFFFF);
  font-weight: 500;
}
.page-about__brand-item::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--page-accent);
  font-weight: 700;
}
.page-about__brand-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about__brand-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--page-border-med) solid var(--page-border);
  box-shadow: var(--page-shadow-md);
}

/* Divider skew */
.page-about__divider {
  margin: 0;
  background: var(--page-accent);
  height: 4px;
  clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
  max-width: 100%;
}
.page-about__divider--reverse {
  clip-path: polygon(2% 0, 98% 0, 100% 100%, 0 100%);
}

/* Skill tree – service path */
.page-about__section--path {
  background: var(--page-surface);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about__path-intro {
  text-align: center;
  color: var(--page-text-secondary);
  margin: -8px 0 48px;
  font-size: 1.05rem;
}
.page-about__skilltree {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  max-width: 800px;
  margin: 0 auto 48px;
  padding-left: 0;
}
.page-about__skilltree::before {
  content: "";
  position: absolute;
  left: 32px;
  top: 40px;
  bottom: 40px;
  width: 2px;
  background: var(--page-accent);
  opacity: 0.35;
  transform: translateX(-50%);
}
.page-about__skilltree-node {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 20px 16px;
  position: relative;
  transition: background 0.3s, box-shadow 0.3s;
  border-left: 2px solid transparent;
  cursor: default;
}
.page-about__skilltree-node:hover,
.page-about__skilltree-node:focus-within {
  background: rgba(255,107,53,0.06);
  border-left-color: var(--page-accent);
  box-shadow: var(--page-shadow-sm, 0 2px 8px rgba(0,0,0,0.3));
}
.page-about__skilltree-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--page-accent);
  color: var(--page-bg-dark);
  font-family: var(--page-font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
  position: relative;
  z-index: 1;
}
.page-about__skilltree-content {
  flex: 1;
  min-width: 0;
}
.page-about__skilltree-label {
  font-family: var(--page-font-heading);
  font-size: 1.2rem;
  margin: 0 0 6px;
  color: var(--color-text-primary, #FFFFFF);
}
.page-about__skilltree-desc {
  color: var(--page-text-secondary);
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
  opacity: 0.85;
  transition: opacity 0.3s;
}
.page-about__skilltree-node:hover .page-about__skilltree-desc {
  opacity: 1;
}
.page-about__path-figure {
  text-align: center;
}
.page-about__path-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--page-border-med) solid var(--page-border);
  box-shadow: var(--page-shadow-md);
}

/* Tech highlights */
.page-about__section--tech {
  background: var(--page-bg-dark);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about__tech-grid {
  margin-top: 40px;
}
.page-about__tech-card {
  background: var(--page-surface);
  padding: 28px 20px;
  border: var(--page-border-med) solid var(--page-border);
  box-shadow: var(--page-shadow-md);
  transition: transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: var(--page-gap);
}
.page-about__tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--page-shadow-lg);
}
.page-about__tech-badge {
  align-self: flex-start;
  background: var(--page-accent);
  color: var(--page-bg-dark);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: 0;
}
.page-about__tech-title {
  font-family: var(--page-font-heading);
  font-size: 1.3rem;
  margin: 0;
  color: var(--color-text-primary, #FFFFFF);
}
.page-about__tech-desc {
  color: var(--page-text-secondary);
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.55;
  flex: 1;
}
.page-about__tech-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--page-border);
  margin-top: auto;
}
.page-about__tech-placeholder {
  min-height: 120px;
  background: repeating-linear-gradient(45deg, rgba(140,158,171,0.05) 0, rgba(140,158,171,0.05) 12px, rgba(255,107,53,0.03) 12px, rgba(255,107,53,0.03) 24px);
  border: 1px dashed var(--page-border);
  flex: 1;
  margin-top: auto;
}

/* Support section */
.page-about__section--support {
  background: var(--page-primary);
  padding-top: 80px;
  padding-bottom: 80px;
}
.page-about__support-intro {
  text-align: center;
  color: var(--page-text-secondary);
  margin: -8px 0 48px;
  font-size: 1.05rem;
}
.page-about__support-grid {
  gap: 40px var(--page-gap);
}
.page-about__support-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.page-about__support-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 20px;
  background: rgba(255,255,255,0.03);
  border-left: var(--page-border-thick) solid var(--page-accent);
  transition: background 0.3s, box-shadow 0.3s;
}
.page-about__support-step:hover {
  background: rgba(255,107,53,0.08);
  box-shadow: var(--page-shadow-sm, 0 2px 8px rgba(0,0,0,0.3));
}
.page-about__support-step-num {
  flex-shrink: 0;
  font-family: var(--page-font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--page-accent);
  min-width: 32px;
}
.page-about__support-step-body {
  flex: 1;
  min-width: 0;
}
.page-about__support-step-title {
  font-family: var(--page-font-heading);
  font-size: 1.05rem;
  margin: 0 0 4px;
  color: var(--color-text-primary, #FFFFFF);
}
.page-about__support-step-text {
  color: var(--page-text-secondary);
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}
.page-about__support-devices {
  padding: 0;
}
.page-about__support-devices-title {
  font-family: var(--page-font-heading);
  font-size: 1.1rem;
  margin: 0 0 16px;
  color: var(--color-text-primary, #FFFFFF);
}
.page-about__support-details {
  border: 1px solid var(--page-border);
  margin-bottom: 8px;
  background: rgba(255,255,255,0.02);
  transition: border-color 0.3s;
}
.page-about__support-details[open] {
  border-color: var(--page-accent);
}
.page-about__support-summary {
  padding: 12px 16px;
  font-weight: 600;
  color: var(--color-text-primary, #FFFFFF);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s;
  font-size: 0.95rem;
}
.page-about__support-summary::-webkit-details-marker {
  display: none;
}
.page-about__support-summary::before {
  content: "+";
  display: inline-block;
  width: 20px;
  height: 20px;
  background: var(--page-accent);
  color: var(--page-bg-dark);
  text-align: center;
  line-height: 20px;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.page-about__support-details[open] > .page-about__support-summary::before {
  content: "–";
}
.page-about__support-summary:hover,
.page-about__support-summary:focus {
  color: var(--page-accent);
}
.page-about__support-detail-body {
  padding: 0 16px 16px 44px;
  color: var(--page-text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}
.page-about__support-detail-body p {
  margin: 0;
}
.page-about__support-devices-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--page-border-med) solid var(--page-border);
  box-shadow: var(--page-shadow-md);
  margin-top: 28px;
}

/* Internal links panel */
.page-about__section--links {
  background: var(--page-bg-dark);
  padding-top: 64px;
  padding-bottom: 80px;
}
.page-about__links-panel {
  border: var(--page-border-thick) solid var(--page-accent);
  padding: 40px 24px;
  text-align: center;
  box-shadow: var(--page-shadow-lg);
}
.page-about__links-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}
.page-about__links-btn {
  flex: 0 1 auto;
  min-width: 120px;
  text-align: center;
}

/* Responsive adjustments */
@media (max-width: 767px) {
  .page-about__breadcrumb {
    padding: 12px 16px 0;
  }
  .page-about__cover {
    padding: 24px 0 40px;
  }
  .page-about__cover-frame {
    padding: 24px 16px;
    border-width: 2px;
  }
  .page-about__cover-title {
    font-size: clamp(2rem, 10vw, 2.8rem);
  }
  .page-about__cover-lede {
    font-size: 0.95rem;
    padding-left: 14px;
  }
  .page-about__cover-index {
    font-size: 0.8rem;
    gap: 4px;
  }
  .page-about__section {
    padding: 48px 16px;
  }
  .page-about__section-title {
    font-size: clamp(1.5rem, 5vw, 1.8rem);
  }
  .page-about__skilltree::before {
    left: 24px;
  }
  .page-about__skilltree-num {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
  }
  .page-about__skilltree-node {
    padding: 16px 12px;
    gap: 14px;
  }
  .page-about__tech-card {
    padding: 20px 16px;
  }
  .page-about__tech-grid .grid__col--4 {
    width: 100%;
  }
  .page-about__support-step {
    padding: 12px 14px;
    flex-wrap: wrap;
  }
  .page-about__support-devices {
    margin-top: 24px;
  }
  .page-about__links-panel {
    padding: 28px 16px;
  }
  .page-about__links-nav {
    flex-direction: column;
    align-items: center;
  }
  .page-about__links-btn {
    width: 100%;
    max-width: 260px;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .page-about__cover-frame {
    padding: 40px 32px;
  }
  .page-about__cover-title {
    font-size: clamp(3rem, 8vw, 4rem);
  }
  .page-about__section {
    padding: 64px 32px;
  }
  .page-about__tech-card {
    margin-bottom: 0;
  }
}

@media (min-width: 1024px) {
  .page-about__cover-frame {
    padding: 64px 48px;
  }
  .page-about__cover-title {
    font-size: 4.8rem;
  }
  .page-about__brand-visual {
    justify-content: flex-end;
  }
  .page-about__skilltree {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0;
    padding-left: 0;
    justify-content: center;
  }
  .page-about__skilltree::before {
    left: auto;
    top: auto;
    bottom: auto;
    width: auto;
    height: 2px;
    top: 48px;
    left: 60px;
    right: 60px;
    transform: none;
    opacity: 0.25;
  }
  .page-about__skilltree-node {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 24px 20px;
    border-left: none;
    border-top: 2px solid transparent;
    flex: 1 1 180px;
    max-width: 220px;
    gap: 12px;
  }
  .page-about__skilltree-node:hover,
  .page-about__skilltree-node:focus-within {
    border-left-color: transparent;
    border-top-color: var(--page-accent);
  }
  .page-about__skilltree-num {
    width: 56px;
    height: 56px;
    font-size: 1.3rem;
    clip-path: polygon(0 0, 100% 0, 90% 100%, 10% 100%);
  }
  .page-about__skilltree-content {
    text-align: center;
  }
  .page-about__skilltree-desc {
    font-size: 0.88rem;
  }
  .page-about__tech-card {
    margin-bottom: 0;
  }
  .page-about__support-devices-img {
    margin-top: 32px;
  }
}

.page-about {
  --page-shadow-sm: var(--page-shadow-md);
}