/* =====================================================
   Desktop — hide mobile-only elements
   ===================================================== */
.nav-hamburger   { display: none; }
.nav-mobile-menu { display: none; }

/* =====================================================
   Mobile — max 720px
   ===================================================== */
@media (max-width: 720px) {

  /* ── Header ── */
  header {
    padding: 0.5rem 1.2rem !important;
    background: transparent !important;
    backdrop-filter: none !important;
  }

  header.shrink {
    background: transparent !important;
    backdrop-filter: none !important;
  }

  /* ── Nav: logo centered, hamburger absolute right ── */
  .nav {
    flex-direction: row;
    justify-content: center;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0;
    position: relative;
  }

  /* Hide desktop link groups and lang toggle */
  .nav-links,
  .lang-toggle { display: none; }

  /* Logo bigger and centered */
  .nav-logo img {
    height: 120px !important;
  }

  /* Shrunk logo on mobile */
  header.shrink .nav-logo img {
    height: 55px !important;
  }

  /* ── Hamburger button — absolute right so logo stays centered ── */
  .nav-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    width: 34px;
    flex-shrink: 0;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
  }

  .nav-hamburger span {
    display: block;
    height: 1.5px;
    background: #fff;
    border-radius: 2px;
    filter: drop-shadow(0 1px 3px rgba(0,0,0,0.6));
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: center;
  }

  .nav-hamburger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  .nav-hamburger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .nav-hamburger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

  /* ── Mobile dropdown menu ── */
  .nav-mobile-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(10px);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    z-index: 300;
  }

  .nav-mobile-menu.is-open {
    max-height: 420px;
  }

  .nav-mobile-menu a {
    display: block;
    width: 100%;
    text-align: center;
    padding: 0.85rem 1rem;
    font-size: 0.75rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: #fff;
    text-shadow: none;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    transition: background 0.2s ease;
    font-family: var(--font-sans);
  }

  .nav-mobile-menu a:hover { background: rgba(255,255,255,0.08); }

  .nav-mobile-lang {
    display: flex;
    gap: 0.6rem;
    padding: 0.9rem 0;
  }

  /* ── Sections ── */
  .bg-photo-section { min-height: 100vh; margin-bottom: 100vh; }
  .paper-card { min-height: 180vh; padding: 2.1rem 1.6rem; }
  .two-col { grid-template-columns: 1fr; }

  /* countdown */
  .countdown--elegant { gap: 1.4rem; flex-wrap: wrap; }
  .countdown--elegant .count-number { letter-spacing: 0.1em; }
}

/* =====================================================
   #site-bg is position:fixed and handles all backgrounds.
   No mobile override needed — works on iOS too.
   ===================================================== */