/* ==========================================================================
   Responsive Breakpoints & Layout Flow Guard - VN DIGITAL SOLUTION
   Zero-overflow mobile architecture (down to 320px)
   ========================================================================== */

/* Universal Overflow Protection */
html, body {
  overflow-x: hidden !important;
  max-width: 100vw !important;
  width: 100% !important;
}

/* --------------------------------------------------------------------------
   Desktop L: <= 1280px
   -------------------------------------------------------------------------- */
@media (max-width: 1280px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 2.5rem;
  }

  .nav-menu {
    gap: 1.15rem;
  }

  .process-steps-wrap {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

/* --------------------------------------------------------------------------
   Desktop M / Tablet L: <= 1100px
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3.5rem;
  }

  .hero-badges-row, .hero-cta-group {
    justify-content: center;
  }

  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
  }

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

  .contact-section-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

/* --------------------------------------------------------------------------
   Tablet & Mobile: <= 992px (Mobile Navigation Active)
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  /* Site Header & Navigation Container */
  .site-header {
    height: 70px;
  }

  .nav-container {
    height: 70px;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
    gap: 1rem;
  }

  .nav-actions {
    gap: 0.85rem;
  }

  /* Hide quick phone link on tablet */
  .phone-quick {
    display: none;
  }

  /* Hamburger Menu Toggle Button */
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: #FFFFFF;
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
  }

  .menu-toggle:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--border-red);
    color: var(--color-primary-400);
  }

  /* Mobile Slide-down Menu Drawer */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
    background: rgba(6, 8, 13, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem 1.5rem 2.5rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-150%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 999;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.85);
  }

  .nav-menu.mobile-open {
    transform: translateY(0);
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-link {
    display: block;
    width: 100%;
    font-size: 1.05rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .mobile-lang-wrap {
    display: flex;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-subtle);
    width: 100%;
    justify-content: flex-start;
  }

  .mobile-cta-wrap {
    display: block;
    width: 100%;
    padding-top: 0.5rem;
  }

  .mobile-cta-wrap .btn {
    width: 100%;
    justify-content: center;
    padding: 0.85rem 1.5rem;
  }

  /* Page Sections */
  .services-grid {
    grid-template-columns: 1fr;
  }

  .process-steps-wrap {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

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

  .form-group.full-width {
    grid-column: span 1;
  }

  .floating-badge {
    display: none;
  }

  .legal-card-overlay {
    position: static;
    max-width: 100%;
    margin-top: 1.5rem;
  }
}

/* --------------------------------------------------------------------------
   Mobile Landscape & Phablet: <= 768px (Crucial Header Streamline)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  /* Hide CTA button from top header bar - placed inside menu instead */
  .nav-actions .nav-cta-btn {
    display: none !important;
  }

  .site-header {
    height: 64px;
  }

  .nav-container {
    height: 64px;
    padding-left: 1rem;
    padding-right: 1rem;
    gap: 0.75rem;
  }

  .nav-actions {
    gap: 0.6rem;
  }

  /* Compact Brand Logo */
  .brand-logo {
    gap: 0.6rem;
  }

  .logo-icon {
    width: 38px;
    height: 38px;
    font-size: 1.15rem;
  }

  .logo-title {
    font-size: 1.15rem;
  }

  .logo-sub {
    font-size: 0.62rem;
    letter-spacing: 0.08em;
  }

  .nav-menu {
    top: 64px;
    max-height: calc(100vh - 64px);
  }

  /* Lang switcher in top header: compact */
  .lang-switcher {
    padding: 2px;
    gap: 2px;
  }

  .lang-btn {
    padding: 0.22rem 0.5rem;
    font-size: 0.75rem;
  }
}

/* --------------------------------------------------------------------------
   Mobile Portrait: <= 640px
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .hero-section {
    padding: 4rem 0 5rem 0;
  }

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

  .badge-pill {
    justify-content: center;
  }

  .hero-stats-bar {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    justify-content: center;
  }

  .lead-form-card {
    padding: 1.75rem 1.25rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
}

/* --------------------------------------------------------------------------
   Small Mobile Devices: <= 480px (Ultra-Compact Header Guard)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .site-header {
    height: 60px;
  }

  .nav-container {
    height: 60px;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
    gap: 0.5rem;
  }

  /* Brand Logo: Hide sub text to guarantee zero horizontal overflow */
  .brand-logo {
    gap: 0.5rem;
  }

  .logo-icon {
    width: 34px;
    height: 34px;
    font-size: 1.05rem;
    border-radius: var(--radius-sm);
  }

  .logo-title {
    font-size: 1.05rem;
  }

  .logo-sub {
    display: none !important;
  }

  /* Language Switcher: Show only flag/compact pill */
  .lang-switcher {
    padding: 2px;
    gap: 2px;
  }

  .lang-btn {
    padding: 0.2rem 0.45rem;
    font-size: 0.72rem;
    gap: 0.25rem;
  }

  .lang-btn .lang-text {
    font-size: 0.7rem;
  }

  .menu-toggle {
    width: 38px;
    height: 38px;
    font-size: 1.15rem;
  }

  .nav-menu {
    top: 60px;
    max-height: calc(100vh - 60px);
    padding: 1.5rem 1.25rem 2rem;
  }

  .hero-stats-bar {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .section-badge {
    font-size: 0.75rem;
  }
}