/* ═══════════════════════════════════════════
   RESPONSIVE.CSS — Breakpoints & Mobile-First
   ═══════════════════════════════════════════ */

/* ── Tablet & Below: ≤ 1023px ────────────── */
@media (max-width: 1023px) {

  .header__nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--color-white);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
    padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    transition: right var(--transition-base);
    z-index: var(--z-overlay);
    overflow-y: auto;
  }
  .header__nav.open {
    right: 0;
  }

  .header__menu {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .header__link {
    display: block;
    width: 100%;
    padding: var(--space-md) 0;
    font-size: var(--fs-md);
    border-bottom: 1px solid var(--color-gray-100);
  }

  .header__cta {
    display: none;
  }

  .header__toggle {
    display: flex;
  }

  /* Hero */
  .hero {
    min-height: 500px;
    max-height: 800px;
  }
  .hero__title {
    font-size: var(--fs-2xl);
  }

  /* About */
  .about__values {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Services */
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Stats */
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Transport */
  .transport__solutions {
    grid-template-columns: repeat(2, 1fr);
  }
  .transport__pillar {
    padding: var(--space-xl);
  }
  .transport__deliverables-grid,
  .transport__diagnosis-grid,
  .transport__phases-grid {
    grid-template-columns: 1fr;
  }

  /* Insights */
  .insights__grid {
    grid-template-columns: 1fr;
  }

  /* Products */
  .product-card {
    min-width: calc(50% - var(--space-xl) / 2);
  }

  /* Contact */
  .contact__grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }
  .footer__brand {
    grid-column: 1 / -1;
  }
}

/* ── Mobile: ≤ 767px ─────────────────────── */
@media (max-width: 767px) {

  :root {
    --header-height: 64px;
  }

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

  /* Hero */
  .hero {
    height: 100svh;
    min-height: 480px;
    max-height: 700px;
  }
  .hero__content {
    padding-top: calc(var(--header-height) + var(--space-xl));
    justify-content: flex-end;
    padding-bottom: calc(var(--space-5xl) + var(--space-xl));
  }
  .hero__title {
    font-size: var(--fs-xl);
  }
  .hero__subtitle {
    font-size: var(--fs-base);
  }
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }
  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }
  .hero__controls {
    bottom: var(--space-lg);
  }
  .hero__arrow {
    width: 36px;
    height: 36px;
    font-size: 12px;
  }

  /* Section headers */
  .section-header {
    margin-bottom: var(--space-2xl);
  }
  .section-header__title {
    font-size: var(--fs-lg);
  }

  /* About */
  .about {
    padding: var(--space-4xl) 0;
  }
  .about__mission {
    flex-direction: column;
    text-align: center;
    padding: var(--space-xl);
  }
  .about__mission-text {
    font-size: var(--fs-md);
  }
  .about__values {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }
  .about__value {
    padding: var(--space-lg) var(--space-md);
  }
  .about__value-icon {
    width: 56px;
    height: 56px;
    font-size: 1.3rem;
  }

  /* Services */
  .services {
    padding: var(--space-4xl) 0;
  }
  .services__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Stats */
  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
  .stats__number {
    font-size: var(--fs-xl);
  }

  /* Transport */
  .transport {
    padding: var(--space-4xl) 0;
  }
  .transport__bg {
    background-attachment: scroll;
  }
  .transport__solutions {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .transport__featured-stats {
    flex-direction: column;
    gap: var(--space-lg);
    align-items: center;
  }
  .transport__pillar {
    padding: var(--space-lg);
  }
  .transport__diagnosis {
    padding: var(--space-lg);
  }
  .transport__phases {
    padding: var(--space-lg);
  }
  .transport__cta {
    padding: var(--space-lg);
  }

  /* Benefits */
  .benefits {
    padding: var(--space-4xl) 0;
  }
  .benefits__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .benefits__col {
    padding: var(--space-lg);
  }
  .benefits__col-title {
    font-size: var(--fs-md);
  }

  /* Insights */
  .insights {
    padding: var(--space-4xl) 0;
  }
  .insights__cta {
    padding: var(--space-xl);
  }
  .insight-card {
    padding: var(--space-lg);
  }

  /* Products */
  .products {
    padding: var(--space-4xl) 0;
  }
  .product-card {
    min-width: calc(100% - var(--space-md));
  }

  /* Contact */
  .contact {
    padding: var(--space-4xl) 0;
  }
  .contact__form {
    padding: var(--space-lg);
  }
  .form-row {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .footer__brand {
    grid-column: auto;
  }
  .footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }
  .footer__legal {
    justify-content: center;
  }

  /* Back to top */
  .back-to-top {
    width: 42px;
    height: 42px;
    bottom: var(--space-md);
    right: var(--space-md);
  }
}

/* ── Small Mobile: ≤ 374px ───────────────── */
@media (max-width: 374px) {
  .about__values {
    grid-template-columns: 1fr;
  }
  .stats__grid {
    grid-template-columns: 1fr;
  }
}

/* ── Large Desktop: ≥ 1440px ─────────────── */
@media (min-width: 1440px) {
  .container {
    max-width: var(--container-2xl);
    padding: 0 var(--space-2xl);
  }
}

/* ── Reduced Motion ──────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-animate] {
    opacity: 1;
    transform: none;
  }

  .hero__bg {
    transform: scale(1) !important;
    transition: none !important;
  }
}

/* Mobile nav overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}
.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}