/* ============================================
   PeriodGuide.com — Themes & Dark Mode
   ============================================ */

/* --- Dark Theme --- */
[data-theme="dark"] {
  --color-white: #1A1A2E;
  --color-gray-50: #1E1E32;
  --color-gray-100: #252540;
  --color-gray-200: #2D2D4A;
  --color-gray-300: #3D3D5C;
  --color-gray-400: #5C5C7A;
  --color-gray-500: #8585A0;
  --color-gray-600: #A0A0B8;
  --color-gray-700: #C0C0D0;
  --color-gray-800: #D8D8E5;
  --color-gray-900: #EBEBF0;
  --color-black: #F5F5FA;

  --color-primary: #FF7B93;
  --color-primary-dark: #FF6680;
  --color-primary-light: #4A2030;
  --color-primary-pale: #2A1520;

  --color-secondary: #9B7FFF;
  --color-secondary-dark: #8B6FFF;
  --color-secondary-light: #3A2A5A;
  --color-secondary-pale: #221A3A;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] body {
  color-scheme: dark;
}

[data-theme="dark"] .nav {
  background: rgba(26, 26, 46, 0.95);
  border-bottom-color: var(--color-gray-200);
}

[data-theme="dark"] .footer {
  background: #0F0F1E;
}

[data-theme="dark"] .evidence-badge--strong {
  background: rgba(46, 204, 113, 0.15);
  color: #4CAF50;
}
[data-theme="dark"] .evidence-badge--moderate {
  background: rgba(33, 150, 243, 0.15);
  color: #64B5F6;
}
[data-theme="dark"] .evidence-badge--emerging {
  background: rgba(255, 152, 0, 0.15);
  color: #FFB74D;
}
[data-theme="dark"] .evidence-badge--traditional {
  background: rgba(156, 39, 176, 0.15);
  color: #CE93D8;
}

[data-theme="dark"] .alert--danger {
  background: rgba(198, 40, 40, 0.15);
  color: #EF9A9A;
}
[data-theme="dark"] .alert--warning {
  background: rgba(230, 81, 0, 0.15);
  color: #FFB74D;
}
[data-theme="dark"] .alert--info {
  background: rgba(21, 101, 192, 0.15);
  color: #90CAF9;
}
[data-theme="dark"] .alert--success {
  background: rgba(46, 125, 50, 0.15);
  color: #A5D6A7;
}

/* Theme Toggle Button */
.theme-toggle {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  transition: all var(--transition-fast);
  color: var(--color-gray-600);
}
.theme-toggle:hover {
  background: var(--color-gray-200);
  color: var(--color-gray-800);
}

/* --- High Contrast Mode --- */
[data-contrast="high"] {
  --color-primary: #D32F4F;
  --color-secondary: #5E35B1;
  --color-gray-600: #424242;
  --color-gray-500: #616161;
}

[data-contrast="high"] .btn--primary {
  background: var(--color-primary);
  box-shadow: none;
}

[data-contrast="high"] .card {
  border-width: 2px;
  border-color: var(--color-gray-400);
}

/* --- Gradient Backgrounds --- */
.bg-gradient-hero {
  background: linear-gradient(135deg, #FFF0F3 0%, #F3F0FF 50%, #E3F2FD 100%);
}

[data-theme="dark"] .bg-gradient-hero {
  background: linear-gradient(135deg, #2A1520 0%, #221A3A 50%, #151A2E 100%);
}

.bg-gradient-warm {
  background: linear-gradient(135deg, #FFF0F3 0%, #FFF8E1 100%);
}

.bg-gradient-cool {
  background: linear-gradient(135deg, #F3F0FF 0%, #E3F2FD 100%);
}

.bg-gradient-menstrual {
  background: linear-gradient(135deg, rgba(232, 93, 117, 0.08), rgba(232, 93, 117, 0.02));
}

.bg-gradient-follicular {
  background: linear-gradient(135deg, rgba(86, 184, 112, 0.08), rgba(86, 184, 112, 0.02));
}

.bg-gradient-ovulation {
  background: linear-gradient(135deg, rgba(245, 166, 35, 0.08), rgba(245, 166, 35, 0.02));
}

.bg-gradient-luteal {
  background: linear-gradient(135deg, rgba(124, 92, 252, 0.08), rgba(124, 92, 252, 0.02));
}

/* --- Decorative Elements --- */
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
  pointer-events: none;
}

.blob--pink {
  background: var(--color-primary);
}

.blob--purple {
  background: var(--color-secondary);
}

.blob--green {
  background: var(--color-follicular);
}

/* --- Animation Classes --- */
.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.slide-up {
  animation: slideUp 0.6s ease forwards;
}

.scale-in {
  animation: scaleIn 0.4s var(--transition-spring) forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-rotate { animation: rotate 20s linear infinite; }

/* --- Print Styles --- */
@media print {
  .nav, .footer, .btn, .mobile-menu,
  .theme-toggle, .lang-switcher,
  .toast-container { display: none !important; }

  body {
    background: white;
    color: black;
    font-size: 12pt;
  }

  .card { box-shadow: none; border: 1px solid #ccc; }

  a { color: black; text-decoration: underline; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.8em; }
}