/* ============================================================
   QUANTEX — Responsive Styles
   Mobile-first breakpoints
   ============================================================
   Breakpoints:
     xs:   < 480px
     sm:   480px – 639px
     md:   640px – 767px
     lg:   768px – 1023px
     xl:   1024px – 1279px
     2xl:  >= 1280px
   ============================================================ */

/* ── Large screens (1280px+) ──────────────────────────────── */
@media (min-width: 1280px) {
  .hero-headline {
    font-size: 5rem;
  }
}

/* ── Below 1024px ─────────────────────────────────────────── */
@media (max-width: 1023px) {

  /* Services: single column on tablet */
  .services-grid {
    grid-template-columns: 1fr;
  }

  /* Security section */
  .security-inner {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
  }

  .security-pillars {
    grid-column: 1 / -1;
    flex-direction: row;
    flex-wrap: wrap;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    row-gap: var(--space-8);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ── Below 900px ──────────────────────────────────────────── */
@media (max-width: 899px) {

  /* Capabilities: 2 columns on tablet */
  .capabilities-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Slider: 2 cards per group on tablet */
  .slide-group {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Testimonials: 2 columns on tablet (fallback) */
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Calculator: stack vertically */
  .calculator-wrapper {
    grid-template-columns: 1fr;
  }

  .calculator-form {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  /* Contact grid: stack */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

/* ── Below 768px (Mobile Nav) ─────────────────────────────── */
@media (max-width: 767px) {

  /* Navigation */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(6,9,18,0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4) var(--space-6) var(--space-6);
    display: none;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  }

  .nav-links.nav-open {
    display: flex;
  }

  .nav-link {
    padding: var(--space-4) var(--space-4);
    font-size: var(--text-base);
    border-radius: var(--radius);
    border-bottom: 1px solid rgba(255,255,255,0.04);
  }

  .nav-link:last-of-type {
    border-bottom: none;
  }

  .nav-cta-btn {
    display: block;
    text-align: center;
    margin-left: 0;
    margin-top: var(--space-4);
    padding: var(--space-4);
    font-size: var(--text-base);
  }

  /* Toggle animation when open */
  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Hero */
  .hero-stats {
    flex-direction: column;
    gap: var(--space-6);
    padding: var(--space-6);
    width: 100%;
  }

  .stat-divider {
    width: 60px;
    height: 1px;
    align-self: center;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  /* Process timeline */
  .process-step {
    grid-template-columns: 40px 1fr;
    column-gap: var(--space-4);
  }

  .step-connector {
    left: 19px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    font-size: 0.65rem;
  }

  /* Security section */
  .security-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .security-icon {
    margin-inline: auto;
  }

  .security-pillars {
    justify-content: center;
  }

  /* FAQ */
  .faq-question {
    padding: var(--space-5) var(--space-6);
    font-size: var(--text-sm);
  }

  .faq-answer {
    padding: 0 var(--space-6) var(--space-5);
  }

  /* Result cards */
  .result-cards {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-brand {
    grid-column: unset;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }

  /* Back to top */
  .back-to-top {
    bottom: var(--space-4);
    right: var(--space-4);
  }
}

/* ── Below 640px ──────────────────────────────────────────── */
@media (max-width: 639px) {

  /* Capabilities: single column on mobile */
  .capabilities-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }

  /* Slider: 1 card per group on mobile */
  .slide-group {
    grid-template-columns: 1fr;
  }

  /* Testimonials: single column on mobile (fallback) */
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .testimonial-service-tag {
    display: none;
  }

  /* Section padding */
  .section-padding {
    padding-block: clamp(3rem, 8vw, 5rem);
  }

  /* Hero */
  .hero-badge {
    font-size: 0.65rem;
    padding: 0.3rem 0.75rem;
  }

  .hero-subtext {
    font-size: var(--text-base);
  }

  /* Services */
  .service-card {
    padding: var(--space-6);
  }

  /* Calculator */
  .calculator-form {
    padding: var(--space-6);
  }

  .calculator-results {
    padding: var(--space-6);
  }

  /* Contact form */
  .contact-form-container {
    padding: var(--space-6);
  }

  /* Section titles */
  .section-title {
    font-size: clamp(var(--text-2xl), 5vw, var(--text-4xl));
  }

  /* Trust bar */
  .trust-bar-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  /* Stats smaller */
  .stat-number {
    font-size: var(--text-4xl);
  }
}

/* ── Below 480px ──────────────────────────────────────────── */
@media (max-width: 479px) {

  .hero-headline {
    font-size: clamp(2rem, 9vw, 2.75rem);
  }

  .contact-title {
    font-size: clamp(var(--text-2xl), 7vw, var(--text-4xl));
  }

  .service-card {
    padding: var(--space-5);
  }

  .faq-question {
    font-size: var(--text-sm);
    padding: var(--space-4) var(--space-5);
  }

  .faq-answer {
    padding: 0 var(--space-5) var(--space-4);
  }

  .hero-stats {
    padding: var(--space-5) var(--space-4);
  }

  .calc-label {
    font-size: var(--text-xs);
  }
}

/* ── Print Styles ─────────────────────────────────────────── */
@media print {
  .site-header,
  .hero-bg-grid,
  .hero-bg-glow,
  .hero-scroll-indicator,
  .back-to-top,
  .nav-toggle {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .text-gradient {
    -webkit-text-fill-color: initial;
    color: #2563eb;
    background: none;
  }

  .section-padding {
    padding-block: 2rem;
  }

  a {
    text-decoration: underline;
  }
}

/* ── High contrast mode ───────────────────────────────────── */
@media (prefers-contrast: high) {
  :root {
    --border: rgba(255,255,255,0.2);
    --border-hover: rgba(99,179,237,0.6);
    --text-secondary: #c4d0e0;
    --text-muted: #7a8fa0;
  }

  .btn-secondary {
    border-width: 2px;
  }

  .service-card,
  .faq-item,
  .contact-form-container,
  .calculator-wrapper {
    border-width: 2px;
  }
}