.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--text-primary);
  position: relative;
  display: flex;
  align-items: center;
  text-transform: uppercase;
}

.logo span {
  background-image: var(--gradient-accent);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.nav-logo {
  height: 36px;
  width: auto;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

[data-theme="light"] .nav-logo {
  filter: invert(1);
}

.nav-logo:hover {
  transform: scale(1.05);
}

.glass-card {
  background: var(--surface-color);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: relative;
}

.glass-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), transparent 45%);
  pointer-events: none;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.06), transparent);
  transform: skewX(-20deg);
  transition: left 0.7s ease;
  z-index: 1;
}

.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  border-color: var(--accent-color);
}

[data-theme="light"] .glass-card:hover {
  border-color: var(--accent-color);
}

.glass-card:hover::before {
  left: 200%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background-image: var(--gradient-accent);
  background-size: 200% 200%;
  background-position: 0% 50%;
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background-position: 100% 50%;
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-outline:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--surface-color);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  margin-left: var(--space-sm);
}

.theme-toggle:hover {
  background-color: var(--glass-bg);
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: scale(1.08) rotate(8deg);
  box-shadow: var(--shadow-glow);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

[data-theme="light"] .icon-moon {
  display: block;
}
[data-theme="light"] .icon-sun {
  display: none;
}
:root .icon-moon {
  display: none;
}
:root .icon-sun {
  display: block;
}

.input-group {
  margin-bottom: var(--space-sm);
  position: relative;
}

.input-control {
  width: 100%;
  padding: 1rem;
  background-color: var(--bg-color);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-control:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-label {
  position: absolute;
  left: 1rem;
  top: 1rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  pointer-events: none;
}

.input-control:focus + .input-label,
.input-control:not(:placeholder-shown) + .input-label {
  top: -0.5rem;
  left: 0.8rem;
  font-size: 0.8rem;
  background-color: var(--surface-color);
  padding: 0 0.3rem;
  color: var(--accent-color);
}

.sound-toggle {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background-color: var(--glass-bg);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  transition: opacity var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.sound-toggle:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.sound-toggle svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  .sound-toggle {
    bottom: calc(var(--space-sm) + 10px);
    right: var(--space-sm);
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 768px) {
  .btn {
    min-height: 44px;
  }

  .theme-toggle,
  .social-icon-link,
  .sound-toggle,
  .back-to-top {
    min-width: 44px;
    min-height: 44px;
  }

  .nav-link {
    display: inline-block;
    padding: 0.5rem 0;
  }
}