/* ============================================================
   MOBILE MENU – Studies Learning Premium
   Full-screen glassmorphism overlay with slide-in animation.
   Triggered by .mobile-menu-toggle button in header.php.
   ============================================================ */

/* ── Burger Icon ─────────────────────────────────────────── */
.mobile-menu-toggle {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 3100;
  position: relative;
}

.burger-icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 26px;
  height: 20px;
  position: relative;
}

.burger-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all 0.35s cubic-bezier(0.77, 0, 0.175, 1);
  position: absolute;
  left: 0;
}

.burger-icon span:nth-child(1) { top: 0; }
.burger-icon span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.burger-icon span:nth-child(3) { bottom: 0; }

/* Burger → X animation when menu is open */
.mobile-menu-toggle[aria-expanded="true"] .burger-icon span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .burger-icon span:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

.mobile-menu-toggle[aria-expanded="true"] .burger-icon span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* ── Mobile Overlay ──────────────────────────────────────── */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 3000;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s;
  padding: 2rem;
}

.mobile-menu-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* ── Mobile Nav Links ────────────────────────────────────── */
.mobile-nav-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: center;
  width: 100%;
  max-width: 320px;
}

.mobile-nav-links li {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

.mobile-menu-overlay.is-open .mobile-nav-links li {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation delays */
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(1) { transition-delay: 0.08s; }
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(2) { transition-delay: 0.14s; }
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(3) { transition-delay: 0.20s; }
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(4) { transition-delay: 0.26s; }
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(5) { transition-delay: 0.32s; }
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(6) { transition-delay: 0.38s; }
.mobile-menu-overlay.is-open .mobile-nav-links li:nth-child(7) { transition-delay: 0.44s; }

.mobile-nav-links a {
  display: block;
  font-family: "Outfit", sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  padding: 0.8rem 1rem;
  border-radius: 16px;
  transition: all 0.3s ease;
  letter-spacing: -0.02em;
}

.mobile-nav-links a:hover,
.mobile-nav-links a:focus,
.mobile-nav-links .current-menu-item > a,
.mobile-nav-links .current_page_item > a,
.mobile-nav-links a.active {
  color: #ffffff;
  background: rgba(0, 71, 255, 0.15);
}

/* ── Mobile CTA Button ───────────────────────────────────── */
.mobile-menu-cta {
  margin-top: 2rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1) 0.5s;
}

.mobile-menu-overlay.is-open .mobile-menu-cta {
  opacity: 1;
  transform: translateY(0);
}

.mobile-menu-cta .btn-campus-mobile {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--primary-blue);
  color: #fff;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 12px 30px rgba(0, 71, 255, 0.35);
  transition: all 0.3s ease;
}

.mobile-menu-cta .btn-campus-mobile:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 71, 255, 0.45);
}

/* ── Show burger, hide desktop nav on mobile ─────────────── */
@media (max-width: 1024px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .navbar-premium .nav-links {
    display: none !important;
  }

  .navbar-premium .nav-actions .btn-campus {
    display: none;
  }

  .navbar-premium {
    padding: 0.5rem 1.5rem;
    width: 96%;
  }

  .navbar-premium .nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .navbar-premium {
    padding: 0.4rem 1rem;
    margin: 8px auto;
  }

  .logo-text {
    font-size: 0.9rem;
  }

  .logo-img {
    width: 32px;
  }

  .mobile-nav-links a {
    font-size: 1.3rem;
    padding: 0.7rem 1rem;
  }
}