@media (max-width: 1200px) {
  .container { padding: 0 20px; }
  .hero-content .container { grid-template-columns: 1fr; }
  .hero-forecast { display: none; }
  .hero-forecast-column .hero-forecast { display: block !important; }
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 900px) {
  .map-container { grid-template-columns: 1fr; }
  .news-layout { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .header-main .container { grid-template-columns: auto 1fr auto; gap: 12px; }
  .header-search { max-width: 200px; }
}
@media (max-width: 768px) {
  html { font-size: 14px; }
  .header-search { display: none; }
  .mobile-menu-btn { display: flex !important; }

  /* Mobile nav: slide-in drawer + overlay */
  #main-nav {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: min(86vw, 360px);
    background: #06121f;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-glass);
    transform: translateX(-105%);
    transition: transform var(--transition-base);
    z-index: 10000;
    overflow-y: auto;
    padding-top: 10px;
    /* iOS/Safari: ensure drawer stays clickable above overlay */
    will-change: transform;
    pointer-events: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
  }
  #main-nav.open { transform: translateX(0); }
  #main-nav .container { padding: 0; }
  .nav-list { flex-direction: column; }
  .nav-item { width: 100%; }
  /* Show mobile controls, hide desktop-only links */
  #main-nav .nav-desktop { display: none !important; }
  #main-nav .nav-mobile { display: flex !important; }
  #main-nav button.nav-link--region {
    border: 0;
    text-align: left;
    cursor: pointer;
    width: 100%;
    touch-action: manipulation;
  }
  /* Contrast + tappable targets（移动端菜单会被 JS 挂到 body 下，所以不要依赖 #site-header 祖先） */
  #main-nav .nav-link {
    width: 100%;
    padding: 14px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.12);
    color: #ffffff !important;
    -webkit-text-fill-color: #ffffff;
    background: transparent;
    font-weight: 800;
    letter-spacing: 0.01em;
  }
  #main-nav .nav-link:active { background: rgba(255,255,255,0.12); }
  #main-nav .nav-arrow { opacity: 0.9; color: rgba(255,255,255,0.85) !important; }

  /* Mobile accordion: dropdown hidden until tapped */
  #main-nav .nav-item .nav-dropdown { display: none; }
  #main-nav .nav-item.ttvn-nav-item-open .nav-dropdown { display: block; }

  .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: rgba(255,255,255,0.07);
    border: none;
    border-radius: 0;
    box-shadow: none;
  }
  #main-nav .nav-dropdown a {
    display: block;
    width: 100%;
    padding: 12px 16px;
    color: #f0f7ff !important;
    -webkit-text-fill-color: #f0f7ff;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    font-weight: 700;
  }
  #main-nav .nav-dropdown a:active { background: rgba(255,255,255,0.1); }

  #ttvn-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(5, 13, 26, 0.65);
    /* Blur overlay can make drawer look “fuzzy” and may break click stacking on some mobile browsers */
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 9990;
    pointer-events: none;
    touch-action: manipulation;
  }
  #ttvn-nav-overlay.active { opacity: 1; visibility: visible; pointer-events: auto; }
  body.ttvn-nav-open { overflow: hidden; }

  .weather-hero { min-height: 360px; }
  .weather-main-display { gap: 16px; }
  .weather-icon-large { font-size: 3.5rem; }
  .temp-value { font-size: 3.5rem; }
  .weather-stats { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .grid-2 { grid-template-columns: 1fr; }
  .province-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .header-top-right { display: none; }
  .featured-article { min-height: 280px; }
  .featured-title { font-size: 1.1rem; }
}

/* Desktop: chỉ link gốc + hover; ẩn nút mobile (giống các mục khác) */
@media (min-width: 769px) {
  #main-nav .nav-mobile,
  #main-nav button.nav-mobile { display: none !important; }
  #main-nav a.nav-link.nav-desktop { display: flex !important; }
}
@media (max-width: 480px) {
  html { font-size: 13px; }
  .logo-tagline { display: none; }
  .header-ticker { display: none; }
  .weather-hero { min-height: 300px; }
  .weather-icon-large { font-size: 2.8rem; }
  .temp-value { font-size: 3rem; }
  .main-weather-card { padding: 16px; }
  .weather-stats { grid-template-columns: 1fr; gap: 6px; }
  .province-grid { grid-template-columns: 1fr; }
  .region-tabs { flex-wrap: wrap; gap: 4px; }
  .news-card { flex-direction: column; }
  .news-thumb { width: 100%; height: 120px; }
  .footer-grid { grid-template-columns: 1fr; }
  .auth-box { padding: 20px 16px; }
  .social-login { grid-template-columns: 1fr; }
  .tidal-grid { grid-template-columns: 1fr; }
  #weather-map { height: 280px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}