/* ===== MOBILE NAV — overlay, toggle, responsive ===== */

/* Backdrop behind open menu */
.mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--nav-duration) var(--nav-ease), visibility var(--nav-duration) var(--nav-ease);
}
.mobile-overlay.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
[data-theme="light"] .mobile-overlay {
  background: rgba(15, 20, 35, 0.28);
}

/* Body lock when menu open */
body.mobile-nav-open {
  overflow: hidden;
  touch-action: none;
}

/* Mobile menu — animated open/close */
.mobile-menu {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    max-height 0.38s var(--nav-ease),
    opacity var(--nav-duration) var(--nav-ease),
    transform var(--nav-duration) var(--nav-ease),
    visibility var(--nav-duration) var(--nav-ease),
    top var(--nav-duration) var(--nav-ease);
}
.mobile-menu.is-open {
  max-height: min(85vh, 640px);
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Hamburger → X animation */
.hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile header: logo + hamburger only (nav-links & nav-tools hidden in style.css) */
@media (max-width: 768px) {
  .nav-logo {
    font-size: 1.05rem;
    min-width: 0;
  }
  .nav-logo svg {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
  }
  .logo-text-main,
  .logo-text-accent {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

@media (max-width: 520px) {
  .nav-icon-btn {
    width: 36px;
    height: 36px;
    font-size: 0.9rem;
  }
}

/* Mobile menu extras row */
.mobile-menu-tools {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--border);
}
.mobile-menu-tools .lang-select,
.mobile-menu-tools .nav-icon-btn {
  flex: 1;
  min-width: calc(50% - var(--space-1));
}
.mobile-menu-chat {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: 10px;
  background: var(--nav-chip-bg);
  border: 1px solid var(--nav-chip-border);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: background var(--nav-duration) var(--nav-ease);
}
.mobile-menu-chat:hover {
  background: var(--nav-chip-bg-hover);
}

@media (min-width: 769px) {
  .mobile-overlay,
  .mobile-menu-tools,
  .mobile-menu-chat {
    display: none !important;
  }
}