/* PersiaVerse Mobile Optimization Pack v1
   Loaded after desktop bundles. Desktop (>900px) is intentionally untouched. */

@media (max-width: 900px) {
  html { scroll-padding-top: 66px; }
  body { overflow-x: hidden; -webkit-text-size-adjust: 100%; }
  section[id] { scroll-margin-top: 68px; }

  /* Faster rendering below the fold on mobile Chromium. */
  #timeline, #ancient, #middle, #modern, #interactive-map,
  #time-machine, #kings, #monuments, #events, #stories {
    content-visibility: auto;
    contain-intrinsic-size: 900px;
  }

  /* Stable compact top bar. */
  nav.smart-nav,
  nav.smart-nav.nav-collapsed,
  nav.smart-nav:not(.nav-collapsed) {
    min-height: 60px;
    height: 60px;
    padding: 8px max(14px, env(safe-area-inset-right)) 8px max(14px, env(safe-area-inset-left));
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(7,7,7,.94);
    border-bottom: 1px solid rgba(212,175,55,.2);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10020;
  }
  .nav-brand { min-width: 0; gap: 8px; }
  .nav-brand .brand-mark {
    width: 34px !important; height: 34px !important;
    display: grid !important; place-items: center;
    border: 1px solid rgba(212,175,55,.52) !important;
    border-radius: 50% !important;
    font-size: .66rem !important;
  }
  .nav-brand .brand-word { font-size: .92rem; max-width: 118px !important; }

  .mobile-menu {
    display: grid !important;
    place-items: center;
    width: 42px; height: 42px;
    flex: 0 0 42px;
    border-radius: 13px;
    border: 1px solid rgba(212,175,55,.28);
    background: rgba(212,175,55,.055);
    color: #ebcf75;
    font-size: 0;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }
  .mobile-menu::before { content: '☰'; font-size: 1.28rem; line-height: 1; }
  nav.smart-nav.mobile-open .mobile-menu::before { content: '×'; font-size: 1.7rem; }

  nav.smart-nav .nav-links,
  nav.smart-nav.nav-collapsed .nav-links {
    display: none !important;
    position: fixed !important;
    top: 66px !important;
    right: 12px !important;
    left: 12px !important;
    width: auto !important;
    max-width: none !important;
    max-height: calc(100dvh - 80px);
    overflow-y: auto !important;
    overscroll-behavior: contain;
    margin: 0 !important;
    padding: 10px !important;
    flex-direction: column !important;
    gap: 3px !important;
    border: 1px solid rgba(212,175,55,.22);
    border-radius: 18px;
    background: rgba(9,9,9,.975) !important;
    box-shadow: 0 22px 60px rgba(0,0,0,.58);
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
    z-index: 10030;
  }
  nav.smart-nav.mobile-open .nav-links { display: flex !important; }
  .nav-links li { width: 100%; display: block; }
  .nav-links a,
  .nav-search-button {
    width: 100%;
    min-height: 44px;
    justify-content: flex-start !important;
    padding: 10px 13px !important;
    border-radius: 11px;
    font-size: .88rem !important;
  }
  .nav-links a:active, .nav-search-button:active { background: rgba(212,175,55,.09); }
  .nav-time-travel { border-top: 1px solid rgba(212,175,55,.14) !important; margin-top: 4px !important; padding-top: 4px !important; }

  /* Hero: use the real mobile viewport and avoid giant empty gaps. */
  .hero {
    min-height: 100svh;
    height: auto;
    padding: calc(84px + env(safe-area-inset-top)) 20px 58px;
  }
  .hero-content { width: min(100%, 650px); }
  .hero h1 { font-size: clamp(3rem, 15vw, 5.2rem); line-height: 1.08; }
  .hero-subtitle { font-size: .94rem; line-height: 2; max-width: 34rem; }

  /* Give mobile screens their width back. */
  .time-meter { display: none !important; }
  .cinematic-timeline-section,
  .history-map-section,
  .time-machine-section,
  .kings-section,
  .monuments-section,
  .events-section,
  .stories-section { padding-inline: 14px !important; }

  /* Reduce GPU-heavy ambient layers on phones. */
  .timeline-particles,
  .timeline-orb,
  .timeline-pattern,
  .stories-orbit,
  .map-ambient-particles { display: none !important; }
  .fade-in { transition-duration: .32s !important; }

  /* Map: prevent horizontal overflow and make controls finger-friendly. */
  .history-map-section { overflow-x: clip; }
  .map-story-layout, .map-shell, .interactive-map-shell { max-width: 100% !important; min-width: 0 !important; }
  .map-controls button, .map-layer-btn, .map-period-card { min-height: 42px; }
  .map-stage, .map-canvas, .map-svg-wrap { max-width: 100%; touch-action: manipulation; }

  /* Forms / controls: avoid iOS/Android zoom on focus. */
  input, select, textarea, button { font-size: max(16px, 1em); }
  .time-machine-form input, .time-machine-form select { min-height: 46px; }

  /* Modal behaves like a comfortable mobile sheet. */
  .king-modal, .monument-modal, .event-modal, .global-search { padding: 8px !important; }
  .king-modal-panel, .monument-modal-panel, .event-modal-panel, .global-search-panel {
    width: 100% !important;
    max-width: 100% !important;
    max-height: calc(100dvh - 16px) !important;
    border-radius: 20px !important;
    overscroll-behavior: contain;
  }

  /* Bigger tap targets and less accidental selection. */
  a, button, [role="button"] { -webkit-tap-highlight-color: rgba(212,175,55,.12); }
  button { touch-action: manipulation; }
}

@media (max-width: 600px) {
  .brand-word { display: inline !important; }
  .cinematic-timeline-header .section-title,
  .section-title { font-size: clamp(2rem, 10vw, 3.15rem) !important; }
  .section-kicker { font-size: .72rem; }

  .timeline-chapter { min-height: auto !important; padding-block: 18px 32px; }
  .timeline-card-copy { padding: 22px 18px !important; }
  .timeline-card h3 { font-size: clamp(1.7rem, 8vw, 2.15rem) !important; }

  .kings-grid, .monuments-grid, .events-grid { gap: 14px !important; }
  .king-card, .monument-card, .event-card { border-radius: 18px !important; }

  .stories-feature { border-radius: 20px !important; }
  .stories-actions { display: grid !important; grid-template-columns: 1fr !important; }
  .stories-actions a { width: 100%; justify-content: center; min-height: 46px; }
}

/* Respect OS accessibility preference everywhere. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* Performance v2: the basemap is visual only; skip hit-testing on phones. */
@media (max-width: 900px) { .geo-basemap { pointer-events: none; } }