/* ---- Navbar ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 11, 16, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--bg-glass-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.nav-links {
  display: none;
  gap: var(--space-2xl);
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  transition: color var(--transition-fast);
  letter-spacing: 0.05em;
}

.nav-links a:hover {
  color: var(--text-secondary);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.lang-toggle {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), border-color var(--transition-fast);
  background: transparent;
  letter-spacing: 0.05em;
}

.lang-toggle:hover {
  color: var(--text-secondary);
  border-color: var(--text-muted);
}

.menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-xs);
}

.menu-btn span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text-muted);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.menu-btn.active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.menu-btn.active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }

  .menu-btn {
    display: none;
  }
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 11, 16, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 999;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-3xl);
  gap: var(--space-xl);
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-family: var(--font-heading);
  font-size: var(--fs-4xl);
  color: var(--text-muted);
  transition: color var(--transition-fast);
  letter-spacing: -0.02em;
}

.mobile-menu a:hover {
  color: var(--text-primary);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: #00dac8;
  transform: translateY(-1px);
}

.btn-outline {
  border: 1px solid var(--bg-glass-border);
  color: var(--text-secondary);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
}

/* ---- Glass Card ---- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-slow);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

/* ---- Badge ---- */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.badge-free {
  background: rgba(0, 212, 170, 0.1);
  color: var(--color-metronome);
}

.badge-paid {
  background: rgba(88, 166, 255, 0.1);
  color: var(--color-sightreader);
}

/* ---- About ---- */
.about-content {
  max-width: 560px;
}

.about-content p {
  color: var(--text-secondary);
  font-size: var(--fs-lg);
  line-height: 1.9;
  margin-bottom: var(--space-lg);
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--bg-glass-border);
  padding: var(--space-3xl) 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-lg);
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-links a {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  transition: color var(--transition-fast);
  letter-spacing: 0.03em;
}

.footer-links a:hover {
  color: var(--text-secondary);
}

.footer-copy {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.02em;
}

/* ---- Grain overlay ---- */
.grain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}