/* ============================
   Responsive Styles
   ============================ */

/* Tablet - 1024px */
@media (max-width: 1024px) {
  .solutions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .solutions-grid .solution-card:last-child {
    grid-column: span 2;
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
  }
  .xinchuang-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hardware-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hardware-showcase {
    grid-template-columns: repeat(3, 1fr);
  }
  .partner-logos {
    grid-template-columns: repeat(4, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
  .xinchuang-banner-inner {
    flex-direction: column;
    text-align: center;
  }

  /* Cases */
  .cases-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Certs */
  .certs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cert-highlight-inner {
    flex-direction: column;
    text-align: center;
  }
  .cert-highlight-image {
    width: 320px;
    height: 220px;
  }
  .cert-issuers {
    justify-content: center;
  }
}

/* Tablet small / large phone - 768px */
@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }

  .header-phone span {
    display: none;
  }

  .header-phone {
    padding: 6px;
  }

  /* Mobile nav */
  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
    gap: 4px;
    box-shadow: var(--shadow-md);
  }
  .nav.open {
    display: flex;
  }
  .nav-link {
    padding: 12px 16px;
    width: 100%;
    border-radius: var(--radius-sm);
  }
  .nav-dropdown {
    width: 100%;
  }
  .nav-dropdown .nav-link {
    width: 100%;
  }
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 0 0 0 20px;
    background: transparent;
  }
  .nav-dropdown .dropdown-menu {
    display: block;
  }
  .hamburger {
    display: flex;
  }

  /* Hero */
  .hero {
    min-height: 90vh;
  }
  .hero-content {
    padding: 100px 24px 60px;
  }
  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }
  .hero-subtitle br {
    display: none;
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 16px;
  }
  .stat-number {
    font-size: 2.2rem;
  }

  /* Solutions */
  .solutions-grid {
    grid-template-columns: 1fr;
  }
  .solutions-grid .solution-card:last-child {
    grid-column: auto;
    max-width: none;
  }

  /* XinChuang */
  .xinchuang-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

  /* Certs */
  .certs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cert-highlight-inner {
    padding: 24px;
  }
  .cert-highlight-image {
    width: 200px;
    height: 280px;
  }

  /* Partners */
  .partner-logos {
    grid-template-columns: repeat(2, 1fr);
  }
  .hardware-grid {
    grid-template-columns: 1fr;
  }
  .hardware-showcase {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  /* Section */
  .section {
    padding: 64px 0;
  }
  .section-header {
    margin-bottom: 40px;
  }

  /* Back to top */
  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

/* Phone - 480px */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 2rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
  }
  .btn {
    padding: 12px 24px;
    font-size: 0.93rem;
  }

  .stats {
    padding: 36px 0;
  }
  .stat-number {
    font-size: 1.8rem;
  }

  .solution-card {
    padding: 28px 22px;
  }

  .xinchuang-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .xinchuang-card {
    padding: 20px 14px;
  }
  .xinchuang-card h4 {
    font-size: 0.95rem;
  }
  .xinchuang-card p {
    font-size: 0.8rem;
  }
  .xinchuang-banner {
    padding: 28px 20px;
  }

  /* Cases */
  .cases-grid {
    grid-template-columns: 1fr;
  }
  .case-tabs {
    gap: 8px;
  }
  .case-tab {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  /* Certs */
  .certs-grid {
    grid-template-columns: 1fr;
  }
  .cert-highlight-image {
    width: 280px;
    height: 190px;
  }
  .cert-highlight-info h3 {
    font-size: 1.2rem;
  }
  .cert-issuers {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Partners & Hardware */
  .partner-logos {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .partner-logo-item {
    padding: 16px 12px;
    font-size: 0.85rem;
  }
  .hardware-showcase {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .contact-form {
    padding: 24px 20px;
  }

  .footer {
    padding: 48px 0 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-brand p {
    font-size: 0.85rem;
  }

  .section-title {
    font-size: 1.6rem;
  }
  .section-desc {
    font-size: 0.93rem;
  }
}

/* Landscape phone */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    min-height: auto;
  }
  .hero-content {
    padding: 100px 24px 40px;
  }
  .hero-scroll {
    display: none;
  }
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .fade-up {
    opacity: 1;
    transform: none;
  }
}

/* ============================
   Lightbox Gallery Responsive
   ============================ */
@media (max-width: 768px) {
  .lightbox-nav {
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }
  .lightbox-prev {
    left: 8px;
  }
  .lightbox-next {
    right: 8px;
  }
  .lightbox img {
    max-width: 95vw;
    max-height: 70vh;
  }
  .lightbox-dots {
    bottom: 60px;
    gap: 8px;
  }
  .lightbox-dot {
    width: 8px;
    height: 8px;
  }
  .lightbox-caption {
    bottom: 95px;
    font-size: 0.9rem;
    padding: 6px 18px;
  }
  .lightbox-counter {
    font-size: 0.82rem;
    padding: 3px 12px;
  }
}

/* ============================
   Solution Detail Pages Responsive
   ============================ */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .scenario-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hardware-mini-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .solution-hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .solution-hero {
    padding: 120px 0 60px;
  }
  .solution-hero h1 {
    font-size: 1.7rem;
  }
  .solution-hero .hero-desc {
    font-size: 1rem;
  }
  .solution-hero-icon {
    width: 64px;
    height: 64px;
  }
  .scenario-grid {
    grid-template-columns: 1fr;
  }
  .hardware-mini-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hardware-mini-item img {
    height: 130px;
  }
  .tech-stack {
    gap: 10px;
  }
  .tech-item {
    padding: 10px 16px;
    font-size: 0.85rem;
  }
  .solution-cta h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .solution-hero {
    padding: 110px 0 48px;
  }
  .solution-hero h1 {
    font-size: 1.4rem;
  }
  .solution-hero-tags {
    gap: 6px;
  }
  .solution-hero-tags span {
    padding: 4px 12px;
    font-size: 0.78rem;
  }
  .feature-card {
    padding: 20px;
  }
  .hardware-mini-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .hardware-mini-item img {
    height: 110px;
  }
  .scenario-card {
    padding: 20px;
  }
  .solution-section {
    padding: 48px 0;
  }
  .solution-cta {
    padding: 56px 0;
  }
  .solution-cta h2 {
    font-size: 1.3rem;
  }
}