/* ─────────────────────────────────────────────────────────────
   MOBILE NAV
───────────────────────────────────────────────────────────── */
:root { --nav-panel-w: 300px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  flex-shrink: 0;
  align-self: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  align-items: center;
  z-index: 300;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-mid);
  border-radius: 2px;
  transition: transform var(--ease-base), opacity var(--ease-base), background var(--ease-base);
  transform-origin: center;
}

.nav-open .nav-toggle .bar-top { transform: translateY(7px) rotate(45deg); background: var(--cyan); }
.nav-open .nav-toggle .bar-mid { opacity: 0; transform: scaleX(0); }
.nav-open .nav-toggle .bar-bot { transform: translateY(-7px) rotate(-45deg); background: var(--cyan); }

.mobile-nav-panel {
  position: fixed;
  top: 0; right: 0;
  height: 100vh;
  width: var(--nav-panel-w);
  background: var(--bg-1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-soft);
  transform: translateX(100%);
  transition: transform var(--ease-slow);
  z-index: 250;
  padding: var(--s6);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  box-shadow: inset 2px 0 0 rgba(1, 191, 255, 0.15);
}

.nav-open .mobile-nav-panel { transform: translateX(0); }

.mobile-nav-panel ul,
.mobile-nav-panel li {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav-panel a {
  display: block;
  font-family: var(--f-heading);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-mid);
  text-decoration: none;
  padding: var(--s4) 0 var(--s4) calc(var(--s3) + 2px);
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--border-dim);
  transition: color var(--ease-fast), border-color var(--ease-fast);
}

.mobile-nav-panel a:hover,
.mobile-nav-panel .current-menu-item > a {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* Staggered cascade for mobile panel items */
.nav-open .mobile-nav-panel > ul > li {
  animation: nav-item-in var(--ease-slow) both;
  animation-delay: calc(var(--i, 0) * 55ms + 80ms);
}

@media (prefers-reduced-motion: reduce) {
  .nav-open .mobile-nav-panel > ul > li { animation: none; }
}

/* Mobile panel close button */
.mobile-nav-close {
  position: absolute;
  top: var(--s5); right: var(--s5);
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid var(--border-soft);
  border-radius: var(--r-sm);
  color: var(--text-mid);
  cursor: pointer;
  font-size: 1.2rem; line-height: 1;
  transition: color var(--ease-fast), border-color var(--ease-fast);
  z-index: 1;
}
.mobile-nav-close:hover { color: var(--cyan); border-color: var(--cyan); }

/* Mobile submenu accordion */
.mobile-nav-panel .menu-item-has-children { position: relative; }
.mobile-nav-panel .menu-item-has-children > a { padding-right: var(--s8); }

.sub-toggle {
  position: absolute; top: 0; right: 0;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: transparent; border: none;
  color: var(--text-mid); cursor: pointer;
  font-size: 0.7rem;
  transition: transform var(--ease-base), color var(--ease-base);
}
.sub-toggle[aria-expanded="true"] { transform: rotate(180deg); color: var(--cyan); }

.mobile-nav-panel .sub-menu {
  overflow: hidden; height: 0;
  transition: height var(--ease-slow);
}
.mobile-nav-panel .sub-menu a {
  display: block; font-size: 0.88rem;
  padding: var(--s3) var(--s4) var(--s3) var(--s5);
  border-bottom: 1px solid var(--border-dim);
  color: var(--text-lo);
  text-transform: none; letter-spacing: 0.04em;
}
.mobile-nav-panel .sub-menu a:hover {
  color: var(--cyan);
  padding-left: calc(var(--s5) + var(--s2));
  border-left: none;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 16, 26, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--ease-base);
  z-index: 240;
}

.nav-open .nav-overlay {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; margin-left: auto; }
  .main-navigation { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .mobile-nav-panel { transition: none; }
  .nav-overlay { transition: none; }
  .nav-toggle-bar { transition: none; }
}