/* ============================================================
   NAVBAR — Navigation, logo, hamburger, sound toggle
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 3rem;
  background: hsla(0, 0%, 4%, 0.6);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid hsla(270, 40%, 50%, 0.1);
  transition: background var(--transition);
}
.navbar.scrolled {
  background: hsla(0, 0%, 4%, 0.85);
}

.nav-logo { cursor: pointer; text-decoration: none; }
.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  border: 1.5px solid hsla(270, 40%, 55%, 0.5);
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
}
.logo-accent { color: var(--purple-1); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 2.5rem;
  margin-left: auto;
}
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 2px;
  background: var(--purple-1);
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-link:hover { color: var(--text-primary); }
.nav-link:hover::after { width: 100%; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Sound Toggle / Visualizer */
.sound-toggle {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
  z-index: 101;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 0;
  margin-left: 1.25rem;
}
.sound-toggle:hover {
  border-color: var(--purple-1);
  transform: scale(1.08);
}
.sound-toggle .bar {
  display: inline-block;
  width: 3px;
  height: 14px;
  background: var(--purple-1);
  border-radius: 1.5px;
  transform-origin: bottom;
}
.sound-toggle.playing .bar {
  animation: visualizerBounce 0.8s ease-in-out infinite alternate;
}
.sound-toggle.playing .bar-1 { animation-delay: 0.15s; }
.sound-toggle.playing .bar-2 { animation-delay: 0.4s; }
.sound-toggle.playing .bar-3 { animation-delay: 0.6s; }
.sound-toggle.playing .bar-4 { animation-delay: 0.25s; }
.sound-toggle.paused .bar {
  height: 4px;
  animation: none;
}