/* ═══════════════════════════════════════════════════════
   NIGHTINGALES SUMMIT — PREMIUM NAVIGATION SYSTEM
   Shared across all pages · v2.0
   ═══════════════════════════════════════════════════════ */

/* ── Base Nav Bar ── */
#main-nav {
  background: linear-gradient(
    180deg,
    rgba(0, 1, 47, 0.55) 0%,
    rgba(0, 1, 47, 0.35) 100%
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(28px) saturate(1.4);
  -webkit-backdrop-filter: blur(28px) saturate(1.4);
}

/* Top accent glow line */
#main-nav::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(6, 225, 135, 0.35) 30%,
    rgba(0, 99, 247, 0.35) 70%,
    transparent
  );
  pointer-events: none;
}

/* Scrolled / shrunk state */
#main-nav.nav-scrolled {
  padding-top: 0.55rem !important;
  padding-bottom: 0.55rem !important;
  background: linear-gradient(
    180deg,
    rgba(0, 1, 47, 0.96) 0%,
    rgba(0, 1, 47, 0.92) 100%
  ) !important;
  border-bottom-color: rgba(255, 255, 255, 0.08) !important;
  box-shadow:
    0 4px 40px rgba(0, 0, 0, 0.35),
    0 1px 0 rgba(6, 225, 135, 0.06) inset;
}

#main-nav.nav-scrolled::before {
  opacity: 0.6;
}

/* Logo hover glow */
#main-nav a img {
  transition: filter 0.4s ease;
}
#main-nav a:hover img {
  filter: drop-shadow(0 0 8px rgba(6, 225, 135, 0.25));
}

/* ── Desktop Links ── */
.nav-link {
  position: relative;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.35rem 0;
  transition: color 0.35s ease;
}

.nav-link:hover {
  color: rgba(255, 255, 255, 0.95);
}

/* Underline sweep */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1.5px;
  border-radius: 2px;
  background: linear-gradient(90deg, #0063f7, #06e187);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Active state — glowing mint */
.nav-link-active {
  color: #06e187 !important;
  text-shadow: 0 0 18px rgba(6, 225, 135, 0.3);
}

.nav-link-active::after {
  transform: scaleX(1) !important;
  transform-origin: left !important;
  background: #06e187 !important;
  box-shadow: 0 0 10px rgba(6, 225, 135, 0.4);
}

/* ── CTA Button — Premium Gradient ── */
.nav-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: linear-gradient(135deg, #06e187 0%, #04c775 100%);
  color: #00012f;
  padding: 0.65rem 1.8rem;
  border-radius: 999px;
  font-size: 0.6rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  white-space: nowrap;
  box-shadow:
    0 2px 16px rgba(6, 225, 135, 0.2),
    0 0 0 1px rgba(6, 225, 135, 0.15) inset;
  overflow: hidden;
  z-index: 1;
}

/* Shimmer sweep */
.nav-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.35),
    transparent
  );
  transition: left 0.6s ease;
  z-index: -1;
}

.nav-cta:hover::before {
  left: 100%;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow:
    0 10px 30px rgba(6, 225, 135, 0.35),
    0 0 0 1px rgba(6, 225, 135, 0.25) inset;
  filter: brightness(1.05);
}

.nav-cta:active {
  transform: translateY(0);
}

/* ── Hamburger Lines ── */
#menu-btn span {
  transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

#menu-btn:hover span {
  background: #06e187 !important;
}

#menu-btn:hover #line3 {
  width: 1.5rem;
}

/* ── Mobile Menu ── */
#mobile-menu {
  transition: opacity 0.45s ease, visibility 0.45s ease;
  backdrop-filter: blur(36px) saturate(1.3);
  -webkit-backdrop-filter: blur(36px) saturate(1.3);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(0, 99, 247, 0.12), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(6, 225, 135, 0.08), transparent 50%),
    rgba(0, 1, 47, 0.96);
}

#mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

/* Subtle grid overlay */
#mobile-menu::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.025;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.9) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.9) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* Decorative accent line */
#mobile-menu::after {
  content: '';
  position: absolute;
  bottom: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, rgba(6,225,135,0.3), transparent);
  pointer-events: none;
}

.mobile-nav-link {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.mobile-nav-link:hover {
  transform: translateX(8px);
  text-shadow: 0 0 20px rgba(6, 225, 135, 0.2);
}

#mobile-menu.active .mobile-nav-link {
  opacity: 1;
  transform: translateY(0);
}

#mobile-menu.active .mobile-nav-link:nth-child(2) { transition-delay: 0.04s; }
#mobile-menu.active .mobile-nav-link:nth-child(3) { transition-delay: 0.08s; }
#mobile-menu.active .mobile-nav-link:nth-child(4) { transition-delay: 0.12s; }
#mobile-menu.active .mobile-nav-link:nth-child(5) { transition-delay: 0.16s; }
#mobile-menu.active .mobile-nav-link:nth-child(6) { transition-delay: 0.20s; }
#mobile-menu.active .mobile-nav-link:nth-child(7) { transition-delay: 0.24s; }
#mobile-menu.active .mobile-nav-link:nth-child(8) { transition-delay: 0.28s; }
#mobile-menu.active .mobile-nav-link:nth-child(9) { transition-delay: 0.32s; }

/* Active mobile link */
.mobile-nav-link-active {
  color: #06e187 !important;
  text-shadow: 0 0 18px rgba(6, 225, 135, 0.35);
}

/* Close button */
.mobile-close-btn {
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  cursor: pointer;
}

.mobile-close-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(6, 225, 135, 0.3);
  color: #06e187;
  transform: rotate(90deg) scale(1.05);
  box-shadow: 0 0 20px rgba(6, 225, 135, 0.15);
}