/* Theme Toggle Button */
#themeToggleBtn {
  background: none;
  border: 2px solid rgba(255,255,255,.2);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 50%;
  transition: all .3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
}
#themeToggleBtn:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.4);
  transform: scale(1.1);
}
#themeToggleBtn:active { transform: scale(.95); }

/* CSS variables for theme switching */
:root,
[data-theme="light"] {
  --bg-primary: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
  --text-primary: #ffffff;
  --text-secondary: rgba(255,255,255,.7);
  --glass-bg: rgba(255,255,255,.1);
  --glass-border: rgba(255,255,255,.2);
  --glass-shadow: 0 8px 32px rgba(0,0,0,.3);
  --card-bg: rgba(255,255,255,.05);
  --card-border: rgba(255,255,255,.1);
  --input-bg: rgba(255,255,255,.1);
  --input-border: rgba(255,255,255,.2);
  --header-bg: rgba(15,15,35,.95);
  --cart-bg: rgba(15,15,35,.95);
  --accent: #4ecdc4;
}

[data-theme="dark"] {
  --bg-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --text-primary: #ffffff;
  --text-secondary: rgba(255,255,255,.6);
  --glass-bg: rgba(255,255,255,.05);
  --glass-border: rgba(255,255,255,.1);
  --glass-shadow: 0 8px 32px rgba(0,0,0,.4);
  --card-bg: rgba(255,255,255,.05);
  --card-border: rgba(255,255,255,.1);
  --input-bg: rgba(255,255,255,.05);
  --input-border: rgba(255,255,255,.1);
  --header-bg: rgba(26,26,46,.95);
  --cart-bg: rgba(26,26,46,.95);
  --accent: #4ecdc4;
}

/* Apply variables */
.liquid-glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.header-scrolled {
  background: var(--header-bg) !important;
}

.feature-card, .stat-item, .menu-item, .faq-item,
.contact-info, .social-item, .team-member {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
}

.cart-panel, .cart-sidebar {
  background: var(--cart-bg);
  border: 1px solid var(--card-border);
}

.form-group input, .form-group select, .form-group textarea {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
}

.form-group input::placeholder {
  color: var(--text-secondary);
}

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

/* Smooth theme transition */
*, *::before, *::after {
  transition: background-color .3s ease, color .3s ease, border-color .3s ease, box-shadow .3s ease;
}

/* Accessibility */
#themeToggleBtn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Responsive */
@media (max-width: 768px) {
  #themeToggleBtn {
    width: 34px;
    height: 34px;
    font-size: 16px;
  }
}