/* ==========================================================================
   RESPONSIVE SYSTEM
   Right-side vertical nav (desktop) -> top bar + fullscreen overlay (mobile)
   ========================================================================== */

@media (max-width: 1024px) {
  .site-nav { display: none; }
  .main-shell { margin-right: 0; }

  .mobile-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 72px;
    padding-inline: var(--gutter);
    background: rgba(7, 26, 43, 0.88);
    backdrop-filter: blur(12px);
    z-index: 500;
  }
  .mobile-bar.is-light { background: rgba(255,255,255,0.9); }
  .mobile-logo { font-family: var(--font-display); font-weight: 700; font-size: 0.95rem; color: var(--white); letter-spacing: 0.02em; }
  .mobile-bar.is-light .mobile-logo { color: var(--navy); }

  .menu-toggle {
    width: 40px; height: 40px;
    display: flex; flex-direction: column; align-items: flex-end; justify-content: center; gap: 6px;
  }
  .menu-toggle span { display: block; height: 1.5px; background: var(--white); transition: all 0.35s var(--ease); }
  .mobile-bar.is-light .menu-toggle span { background: var(--navy); }
  .menu-toggle span:nth-child(1) { width: 26px; }
  .menu-toggle span:nth-child(2) { width: 18px; }
  .menu-toggle.is-open span { background: var(--white) !important; }
  .menu-toggle.is-open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); width: 26px; }
  .menu-toggle.is-open span:nth-child(2) { transform: translateY(-7.5px) rotate(-45deg); width: 26px; }

  .mobile-menu {
    position: fixed; inset: 0;
    background: var(--navy);
    z-index: 490;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 var(--gutter);
    opacity: 0; visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.4s var(--ease), visibility 0.4s, transform 0.4s var(--ease);
  }
  .mobile-menu.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  .mobile-menu-links { display: flex; flex-direction: column; gap: 6px; }
  .mobile-menu-links a {
    font-family: var(--font-display);
    font-size: clamp(2rem, 9vw, 3rem);
    color: rgba(255,255,255,0.5);
    padding-block: 10px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    transition: color 0.3s;
  }
  .mobile-menu-links a.active, .mobile-menu-links a:hover { color: var(--white); }
  .mobile-menu .btn { margin-top: 34px; align-self: flex-start; }
  .mobile-menu-coord {
    position: absolute;
    bottom: 28px; left: var(--gutter);
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: rgba(255,255,255,0.35);
    letter-spacing: 0.06em;
  }

  body.menu-open { overflow: hidden; }

  .hero-content, .page-hero .container { padding-top: 0; }
  .hero { padding-top: 72px; }
  .page-hero { padding-top: calc(72px + clamp(40px, 8vh, 80px)); }
}

@media (max-width: 760px) {
  .section { padding-block: 56px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .timeline { grid-template-columns: 1fr !important; }
  .marquee-item { width: 240px; }
}

@media (max-width: 480px) {
  .hero-actions .btn { width: 100%; justify-content: center; }
  .contact-item a, .contact-item span.value { font-size: 0.95rem; }
}