/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  inset: 0 0 auto;
  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);
  border-bottom: 1px solid hsla(270, 40%, 50%, 0.1);
  transition: background var(--transition);
}
.navbar.scrolled { background: hsla(0, 0%, 4%, 0.85); }

/* Logo */
.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 */
.nav-links {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  margin-left: auto;
  margin-right: 2rem;
  align-items: center;
}
.nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-align: center;
  position: relative;
  transition: color var(--transition);
}
.nav-link:hover { color: var(--text-primary); }

/* Icon Box */
.nav-icon-box {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: hsla(268, 28%, 13%, 0.4);
  border: 1px solid hsla(270, 40%, 50%, 0.2);
  border-radius: 10px;
  transition: background var(--transition), border-color var(--transition),
              transform var(--transition), box-shadow var(--transition);
}
.nav-link:hover .nav-icon-box {
  background: hsla(270, 50%, 40%, 0.25);
  border-color: hsla(270, 80%, 65%, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.nav-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
  filter: brightness(0.8) grayscale(0.2);
  transition: transform var(--transition), filter var(--transition);
}
.nav-link:hover .nav-icon {
  transform: scale(1.1);
  filter: none;
}

/* Tooltip (desktop only) */
@media (min-width: 1101px) {
  .nav-label { display: none; }

  .nav-link::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -32px;
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    background: hsla(270, 50%, 15%, 0.95);
    color: var(--text-primary);
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    white-space: nowrap;
    border: 1px solid hsla(270, 50%, 40%, 0.5);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    /* Visibility */
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
  }
  .nav-link:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }
}

/* Hamburger */
.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 */
.sound-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  width: 40px;
  height: 40px;
  padding: 0;
  margin-left: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 50%;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: border-color var(--transition), transform var(--transition);
  z-index: 101;
}
.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: 0.40s; }
.sound-toggle.playing .bar-3 { animation-delay: 0.60s; }
.sound-toggle.playing .bar-4 { animation-delay: 0.25s; }
.sound-toggle.paused .bar {
  height: 4px;
  animation: none;
}