/* =============================================================================
   Flow Studio - Shared Theme System Styles
   Reusable theme-aware CSS for all Flow Studio projects
   ============================================================================= */

/* =============================================================================
   Theme-Aware CSS Variables (dynamically updated by themes.js)
   These are the core variables that themes will override
   ============================================================================= */
:root {
  /* Theme colors (updated dynamically by theme switcher) */
  --color-primary: #475569;
  --color-primary-light: #64748b;
  --color-primary-dark: #334155;
  --color-accent: #2563eb;
  --color-accent-light: #3b82f6;
  --color-background: #ffffff;
  --color-background-alt: #f8fafc;
  --color-text: #334155;
  --color-text-light: #64748b;
  --color-border: #cbd5e1;

  /* Theme typography (updated dynamically) */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-heading-weight: 600;
  --font-body-weight: 400;

  /* Theme spacing (updated dynamically) */
  --spacing-section: 96px;
  --spacing-card-gap: 24px;

  /* Theme motion (updated dynamically) */
  --motion-duration: 0.25s;
  --motion-easing: cubic-bezier(0.4, 0, 0.2, 1);

  /* Theme gradient (updated dynamically) */
  --gradient-hero: linear-gradient(135deg, #475569 0%, #2563eb 100%);

  /* Static spacing scale (not changed by themes) */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-8: 32px;
  --spacing-10: 40px;
  --spacing-12: 48px;
  --spacing-16: 64px;
  --spacing-20: 80px;
  --spacing-24: 96px;

  /* Static typography scale */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-md: 18px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-2xl: 30px;
  --font-size-3xl: 36px;
  --font-size-4xl: 48px;
  --font-size-5xl: 60px;
  --font-size-6xl: 72px;
  --font-size-7xl: 96px;

  /* Static layout values */
  --content-max-width: 1280px;
  --content-narrow-width: 720px;
  --form-max-width: 480px;

  /* Static border radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* =============================================================================
   Theme Switcher Component Styles
   ============================================================================= */

/* Floating toggle button */
.theme-toggle-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  background: var(--gradient-hero);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-xl);
  transition: all var(--motion-duration) var(--motion-easing);
  font-size: 24px;
}

.theme-toggle-btn:hover {
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.theme-toggle-btn:focus {
  outline: none;
  box-shadow: var(--shadow-xl), 0 0 0 3px var(--color-accent-light);
}

/* Theme switcher panel */
.theme-switcher {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  background: var(--color-background);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-4);
  box-shadow: var(--shadow-xl);
  max-width: 320px;
  transition: all var(--motion-duration) var(--motion-easing);
}

.theme-switcher.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-10px);
}

.theme-switcher__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-3);
  padding-bottom: var(--spacing-3);
  border-bottom: 1px solid var(--color-border);
}

.theme-switcher__title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-switcher__close {
  background: none;
  border: none;
  color: var(--color-text-light);
  cursor: pointer;
  font-size: 20px;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.theme-switcher__close:hover {
  background: var(--color-background-alt);
  color: var(--color-text);
}

.theme-switcher__close:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-accent);
}

.theme-switcher__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-2);
}

/* Theme option buttons */
.theme-option {
  padding: var(--spacing-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-background);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.theme-option:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.theme-option:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.theme-option.active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: white;
}

.theme-option.active .theme-option__name,
.theme-option.active .theme-option__desc {
  color: white;
}

.theme-option__name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-1);
  display: block;
}

.theme-option__desc {
  font-size: 11px;
  color: var(--color-text-light);
  line-height: 1.4;
  display: block;
}

/* Alternative class names for compatibility */
.theme-selector {
  /* Uses .theme-switcher styles */
}

.theme-selector__header {
  /* Uses .theme-switcher__header styles */
}

.theme-selector__title {
  /* Uses .theme-switcher__title styles */
}

.theme-selector__close {
  /* Uses .theme-switcher__close styles */
}

.theme-selector__options {
  /* Uses .theme-switcher__grid styles */
}

.theme-option__description {
  /* Uses .theme-option__desc styles */
}

/* =============================================================================
   Common Animations
   ============================================================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideIn {
  from {
    transform: translateX(-20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Scroll reveal animation (applied via JS) */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s var(--motion-easing);
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .scroll-reveal {
    opacity: 1;
    transform: none;
  }
}

/* =============================================================================
   Responsive Utilities
   ============================================================================= */
@media (max-width: 768px) {
  .theme-toggle-btn {
    width: 48px;
    height: 48px;
    font-size: 20px;
  }

  .theme-switcher {
    max-width: 280px;
  }

  .theme-switcher__grid {
    grid-template-columns: 1fr;
  }
}