/* ===================================================================
   NAV — Fixed navigation bar — Sci-Fi style
   =================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--ease-smooth), padding var(--ease-smooth);
}

.nav.scrolled {
  background: var(--color-overlay-dark);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-sm) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-logo img {
  height: 40px;
  width: auto;
  filter: drop-shadow(0 0 8px var(--color-cyan-glow));
}

.nav-logo span {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-cyan);
  letter-spacing: 0.05em;
  text-shadow: 0 0 12px var(--color-cyan-glow);
}

/* Links */
.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  transition: color var(--ease-base);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-cyan);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-cyan);
  box-shadow: 0 0 6px var(--color-cyan-shadow);
  transition: width var(--ease-base);
}

.nav-links a:hover::after {
  width: 100%;
}

/* CTA button in nav */
.nav-cta {
  background: transparent;
  border: 1px solid var(--color-cyan);
  color: var(--color-cyan);
  padding: 0.6rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
  transition: transform 0.15s cubic-bezier(0.2, 0, 0, 1),
              background 0.2s ease,
              color 0.2s ease,
              border-color 0.2s ease;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

/* Light sweep on nav CTA */
.nav-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    105deg,
    transparent 20%,
    rgba(255, 255, 255, 0.25) 48%,
    rgba(255, 255, 255, 0.4) 50%,
    rgba(255, 255, 255, 0.25) 52%,
    transparent 80%
  );
  pointer-events: none;
}

.nav-cta:hover {
  background: var(--color-cyan);
  color: var(--color-bg);
  transform: translateY(-1px);
  box-shadow: 0 0 20px var(--color-cyan-shadow);
}

.nav-cta:hover::before {
  animation: lightSweep 0.5s ease forwards;
}

.nav-cta:active {
  transform: scale(0.94);
  animation: snapPunch 0.3s cubic-bezier(0.2, 0, 0, 1) forwards;
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: calc(var(--z-nav) + 1);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-cyan);
  transition: all var(--ease-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}