/* Responsive Design */

/* Small screens (640px and up) */
@media (min-width: 640px) {
  .hero-actions {
    flex-direction: row;
    justify-content: center;
    gap: var(--space-4);
  }

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

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

  .download-buttons {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }
}

/* Medium screens (768px and up) */
@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }

  .mobile-menu-toggle {
    display: none;
  }

  .nav-actions {
    gap: var(--space-3);
  }

  .github-link,
  .theme-toggle {
    font-size: var(--font-size-xl);
    width: 44px;
    height: 36px;
  }

  .hero {
    padding: var(--space-12) 0;
  }

  .hero-title {
    font-size: var(--font-size-5xl);
  }

  .section {
    padding: var(--space-12) 0;
  }

  .section-title {
    font-size: var(--font-size-4xl);
  }

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

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

  .footer-section {
    text-align: left;
  }
}

/* Large screens (1024px and up) */
@media (min-width: 1024px) {
  .hero {
    padding: var(--space-16) 0;
  }

  .hero-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }

  .hero-text {
    text-align: left;
  }

  .hero-title {
    font-size: var(--font-size-6xl);
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-stats {
    justify-content: flex-start;
  }

  .hero-subtitle {
    margin-left: 0;
    margin-right: 0;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }

  .steps-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .product-showcase {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }

  .product-info {
    text-align: left;
  }

  .product-description {
    margin-left: 0;
    margin-right: 0;
  }

  .product-features {
    margin-left: 0;
    margin-right: 0;
  }

  .footer-content {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Mobile-specific styles */
@media (max-width: 767px) {
  .nav-actions {
    gap: var(--space-2);
  }

  .github-link,
  .theme-toggle {
    width: 36px;
    height: 36px;
  }

  .lang-toggle {
    padding: var(--space-1);
    font-size: var(--font-size-xs);
  }

  .lang-text {
    display: none;
  }

  .lang-toggle::after {
    content: '中/EN';
    font-size: var(--font-size-xs);
  }

  .brand-logo {
    width: 28px;
    height: 28px;
  }

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

  /* Mobile Menu */
  .nav-menu {
    position: fixed;
    top: 64px;
    right: var(--space-2);
    left: auto;
    width: min(50vw, 200px);
    display: flex;
    background-color: var(--color-header-bg);
    backdrop-filter: var(--blur-lg);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    flex-direction: column;
    gap: var(--space-2);
    transform: translateY(-6px) scale(0.98);
    transform-origin: top right;
    opacity: 0;
    visibility: hidden;
    z-index: calc(var(--z-sticky) + 1);
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - 80px);
    overflow-y: auto;
  }


  /* Fallback for browsers without backdrop-filter support */
  @supports not ((-webkit-backdrop-filter: blur(0px)) or (backdrop-filter: blur(0px))) {
    .nav-menu {
      background-color: rgba(255, 255, 255, 0.9) !important;
    }
  }

  .nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    transition: transform var(--transition-normal),
      opacity var(--transition-normal),
      visibility var(--transition-normal);
  }

  .nav-menu .nav-link {
    padding: var(--space-2) var(--space-3);
    text-align: left;
    background-color: transparent;
    border: none;
    transition: all var(--transition-fast);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    display: block;
    position: relative;
    z-index: 1;
  }

  .nav-menu .nav-link:hover,
  .nav-menu .nav-link:focus {
    background-color: var(--color-background);
    color: var(--color-text);
  }

  .nav-menu .nav-link:active {
    transform: none;
  }

  .nav-menu .nav-link:not(:first-child)::after {
    position: absolute;
    content: '';
    width: 100%;
    top: -10px;
    left: 0;
    border-top: 1px solid var(--color-border);
  }

  .mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    gap: 4px;
    transition: all var(--transition-fast);
  }

  .mobile-menu-toggle:hover {
    background-color: rgba(var(--color-primary-rgb), 0.1);
    border-radius: var(--radius-sm);
  }

  .hamburger-line {
    width: 20px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-fast);
    border-radius: 1px;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  /* Disable desktop slider effect on mobile */
  .nav-menu::before {
    display: none !important;
  }

  /* Mobile Footer: responsive grid layout */
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .footer-section {
    text-align: left;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-2);
  }
}

/* Extra small screens */
@media (max-width: 480px) {
  .nav-actions {
    gap: var(--space-1);
  }

  .github-link,
  .theme-toggle {
    width: 32px;
    height: 32px;
    font-size: var(--font-size-sm);
  }
}