/* ═══════════════════════════════════════
   QUANTUM QA LABS — RESPONSIVE STYLESHEET
   Mobile-first breakpoints & responsive adjustments
   ═══════════════════════════════════════ */

/* ═══════════════════════════════════════
   MOBILE (up to 479px)
   ═══════════════════════════════════════ */

@media (max-width: 479px) {

  :root {
    --header-height: 60px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .section {
    padding: clamp(2rem, 8vw, 3rem) 0;
  }

  .section-lg {
    padding: clamp(3rem, 10vw, 4rem) 0;
  }

  .hero {
    min-height: 90vh;
    padding-top: var(--header-height);
  }

  .hero-content {
    padding: 1.5rem 0.5rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 0.9375rem;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: center;
  }

  .hero-ctas .btn {
    width: 100%;
    max-width: 260px;
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .hero-stat-value {
    font-size: 1.5rem;
  }

  .brand img {
    max-height: 36px;
  }

  .hamburger {
    width: 40px;
    height: 40px;
  }

  .nav-cta {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
  }

  .nav-link {
    font-size: 0.9375rem;
    padding: 0.7rem 0.85rem;
  }

  .nav-mobile {
    top: var(--header-height);
  }

  .trust-strip .container {
    gap: 1rem 1.5rem;
  }

  .trust-item {
    font-size: 0.8rem;
  }

  .trust-item svg {
    width: 20px;
    height: 20px;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .grid-6 {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 1.25rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .cta-section {
    padding: clamp(2.5rem, 8vw, 3.5rem) 0;
  }

  .cta-section h2 {
    font-size: 1.6rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .cta-buttons .btn {
    width: 100%;
    max-width: 280px;
  }

  .service-detail-content {
    grid-template-columns: 1fr;
  }

  .service-detail-sidebar {
    position: static;
  }

  .contact-content {
    grid-template-columns: 1fr;
  }

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

  .careers-content {
    grid-template-columns: 1fr;
  }

  .philosophy-grid {
    grid-template-columns: 1fr;
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .industries-grid {
    grid-template-columns: 1fr;
  }

  .solutions-grid {
    grid-template-columns: 1fr;
  }

  .services-overview-grid {
    grid-template-columns: 1fr;
  }

  .contact-form-grid {
    grid-template-columns: 1fr;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .error-code {
    font-size: 4rem;
  }

  .legal-page {
    padding-top: calc(var(--header-height) + 1.5rem);
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

/* ═══════════════════════════════════════
   TABLET (480px – 767px)
   ═══════════════════════════════════════ */

@media (min-width: 480px) and (max-width: 767px) {

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 2rem;
  }

  .hero-stat-value {
    font-size: 1.75rem;
  }

  .brand img {
    max-height: 44px;
  }

  .trust-strip .container {
    gap: 1.25rem 2.5rem;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr;
  }

  .grid-6 {
    grid-template-columns: 1fr;
  }

  .services-overview-grid {
    grid-template-columns: 1fr;
  }

  .industries-grid {
    grid-template-columns: 1fr;
  }

  .solutions-grid {
    grid-template-columns: 1fr;
  }

  .philosophy-grid {
    grid-template-columns: 1fr;
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ═══════════════════════════════════════
   SMALL DESKTOP (768px – 991px)
   ═══════════════════════════════════════ */

@media (min-width: 768px) and (max-width: 991px) {

  .hero h1 {
    font-size: 2.6rem;
  }

  .hero-subtitle {
    font-size: 1.0625rem;
  }

  .brand img {
    max-height: 50px;
  }

  .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }

  .services-overview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

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

  .contact-form-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-form-grid .form-full {
    grid-column: 1 / -1;
  }
}

/* ═══════════════════════════════════════
   LARGE DESKTOP (1024px – 1279px)
   ═══════════════════════════════════════ */

@media (min-width: 1024px) and (max-width: 1279px) {

  .hero h1 {
    font-size: 3rem;
  }

  .hero-content {
    max-width: 680px;
  }

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

/* ═══════════════════════════════════════
   XL DESKTOP (1280px – 1439px)
   ═══════════════════════════════════════ */

@media (min-width: 1280px) and (max-width: 1439px) {

  .hero h1 {
    font-size: 3.25rem;
  }

  .hero-content {
    max-width: 720px;
  }
}

/* ═══════════════════════════════════════
   HUGE SCREENS (1440px+)
   ═══════════════════════════════════════ */

@media (min-width: 1440px) {

  :root {
    --container-padding: 2.5rem;
  }

  .hero h1 {
    font-size: 3.5rem;
  }

  .hero-content {
    max-width: 800px;
  }

  .footer-grid {
    grid-template-columns: 2fr 2fr 1fr 1fr 1.5fr;
  }
}

/* ═══════════════════════════════════════
   LANDSCAPE MOBILE
   ═══════════════════════════════════════ */

@media (max-width: 767px) and (orientation: landscape) {

  .hero {
    min-height: 80vh;
  }

  .hero-content {
    padding: 1rem 0.5rem;
  }

  .hero h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
  }

  .hero-subtitle {
    font-size: 0.875rem;
    margin-bottom: 1rem;
  }

  .hero-ctas {
    margin-bottom: 1.5rem;
  }

  .hero-ctas .btn {
    padding: 0.6rem 1.25rem;
    font-size: 0.875rem;
  }

  .hero-stats {
    display: none;
  }
}