/* ==========================================================================
   Design System Variables & Theme Config
   ========================================================================== */

/* 1. Base Variables & Layout constants */
:root {
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --max-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. Theme Mappings */

/* --- SLATE THEME (Default) --- */
:root,
[data-theme="slate"][data-mode="light"] {
  --bg-primary: #f1f5f9; /* Softened slate background, not pure white or glaring */
  --bg-secondary: #f8fafc; /* Card background, off-white */
  --bg-tertiary: #e2e8f0;
  
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-color: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.08);
  --accent-hover: #2563eb;
  
  --border-color: rgba(30, 41, 59, 0.08);
  --border-hover: rgba(59, 130, 246, 0.25);
  
  --navbar-bg: rgba(241, 245, 249, 0.85);
  --panel-bg: rgba(248, 250, 252, 0.85);
  --panel-border: rgba(30, 41, 59, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px -2px rgba(30, 41, 59, 0.05), 0 2px 8px -1px rgba(30, 41, 59, 0.03);
  --shadow-lg: 0 20px 25px -5px rgba(30, 41, 59, 0.05), 0 10px 10px -5px rgba(30, 41, 59, 0.03);
  --shadow-accent: 0 10px 15px -3px rgba(59, 130, 246, 0.15);
  
  --panel-shadow: 0 20px 25px -5px rgba(30, 41, 59, 0.08), 0 10px 10px -5px rgba(30, 41, 59, 0.03);
}

[data-theme="slate"][data-mode="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --accent-color: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.12);
  --accent-hover: #93c5fd;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(96, 165, 250, 0.4);
  
  --navbar-bg: rgba(15, 23, 42, 0.85);
  --panel-bg: rgba(30, 41, 59, 0.85);
  --panel-border: rgba(255, 255, 255, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px -2px rgba(0, 0, 0, 0.3), 0 2px 8px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-accent: 0 10px 15px -3px rgba(96, 165, 250, 0.25);
  
  --panel-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* --- SAGE GREEN THEME --- */
[data-theme="green"][data-mode="light"] {
  --bg-primary: #ebf0ec; /* Soft sage green background */
  --bg-secondary: #f5f7f5; /* Card background, soft off-white green-tint */
  --bg-tertiary: #dce3dd;
  
  --text-primary: #1c281e; /* Deep forest charcoal */
  --text-secondary: #425244;
  --text-muted: #667a69;
  
  --accent-color: #387a4b;
  --accent-soft: rgba(56, 122, 75, 0.08);
  --accent-hover: #2b5e39;
  
  --border-color: rgba(28, 40, 30, 0.08);
  --border-hover: rgba(56, 122, 75, 0.3);
  
  --navbar-bg: rgba(235, 240, 236, 0.85);
  --panel-bg: rgba(245, 247, 245, 0.85);
  --panel-border: rgba(28, 40, 30, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px -2px rgba(28, 40, 30, 0.05), 0 2px 8px -1px rgba(28, 40, 30, 0.03);
  --shadow-lg: 0 20px 25px -5px rgba(28, 40, 30, 0.05), 0 10px 10px -5px rgba(28, 40, 30, 0.03);
  --shadow-accent: 0 10px 15px -3px rgba(56, 122, 75, 0.15);
  
  --panel-shadow: 0 20px 25px -5px rgba(28, 40, 30, 0.08), 0 10px 10px -5px rgba(28, 40, 30, 0.03);
}

[data-theme="green"][data-mode="dark"] {
  --bg-primary: #111813; /* Deep dark moss green */
  --bg-secondary: #18221b; /* Moss card background */
  --bg-tertiary: #243328;
  
  --text-primary: #e1ece3;
  --text-secondary: #a0b2a3;
  --text-muted: #738576;
  
  --accent-color: #51b86d;
  --accent-soft: rgba(81, 184, 109, 0.12);
  --accent-hover: #7acc91;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(81, 184, 109, 0.4);
  
  --navbar-bg: rgba(17, 24, 19, 0.85);
  --panel-bg: rgba(24, 34, 27, 0.85);
  --panel-border: rgba(255, 255, 255, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px -2px rgba(0, 0, 0, 0.3), 0 2px 8px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-accent: 0 10px 15px -3px rgba(81, 184, 109, 0.25);
  
  --panel-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* --- WARM SAND THEME --- */
[data-theme="sand"][data-mode="light"] {
  --bg-primary: #f3ede2; /* Soft sand paper background */
  --bg-secondary: #f9f6f0; /* Card background, warm ivory */
  --bg-tertiary: #e6dfce;
  
  --text-primary: #3c2f21; /* Deep chocolate-charcoal */
  --text-secondary: #5c4d3c;
  --text-muted: #7c6d5b;
  
  --accent-color: #b86d3b;
  --accent-soft: rgba(184, 109, 59, 0.08);
  --accent-hover: #995528;
  
  --border-color: rgba(60, 47, 33, 0.08);
  --border-hover: rgba(184, 109, 59, 0.3);
  
  --navbar-bg: rgba(243, 237, 226, 0.85);
  --panel-bg: rgba(249, 246, 240, 0.85);
  --panel-border: rgba(60, 47, 33, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px -2px rgba(60, 47, 33, 0.05), 0 2px 8px -1px rgba(60, 47, 33, 0.03);
  --shadow-lg: 0 20px 25px -5px rgba(60, 47, 33, 0.05), 0 10px 10px -5px rgba(60, 47, 33, 0.03);
  --shadow-accent: 0 10px 15px -3px rgba(184, 109, 59, 0.15);
  
  --panel-shadow: 0 20px 25px -5px rgba(60, 47, 33, 0.08), 0 10px 10px -5px rgba(60, 47, 33, 0.03);
}

[data-theme="sand"][data-mode="dark"] {
  --bg-primary: #18130f; /* Deep cocoa-black */
  --bg-secondary: #221c17; /* Warm charcoal card background */
  --bg-tertiary: #312720;
  
  --text-primary: #f4ede6;
  --text-secondary: #c5b7aa;
  --text-muted: #9a8b7e;
  
  --accent-color: #e0945b;
  --accent-soft: rgba(224, 148, 91, 0.12);
  --accent-hover: #f2ac78;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(224, 148, 91, 0.4);
  
  --navbar-bg: rgba(24, 19, 15, 0.85);
  --panel-bg: rgba(34, 28, 23, 0.85);
  --panel-border: rgba(255, 255, 255, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px -2px rgba(0, 0, 0, 0.3), 0 2px 8px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-accent: 0 10px 15px -3px rgba(224, 148, 91, 0.25);
  
  --panel-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

/* Fallback for system dark mode when no data attribute is explicitly set */
@media (prefers-color-scheme: dark) {
  :root:not([data-mode]) {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --accent-color: #60a5fa;
    --accent-soft: rgba(96, 165, 250, 0.12);
    --accent-hover: #93c5fd;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(96, 165, 250, 0.4);
    
    --navbar-bg: rgba(15, 23, 42, 0.85);
    --panel-bg: rgba(30, 41, 59, 0.85);
    --panel-border: rgba(255, 255, 255, 0.08);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px -2px rgba(0, 0, 0, 0.3), 0 2px 8px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --shadow-accent: 0 10px 15px -3px rgba(96, 165, 250, 0.25);
    
    --panel-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  }
}

/* ==========================================================================
   Base Elements & Reset
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

button {
  background: none;
  border: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  padding: 0;
  cursor: pointer;
  outline: none;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* ==========================================================================
   Progress Bar & Top Navbar
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 9999;
  background-color: transparent;
}

.scroll-progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--accent-color);
  transition: width 100ms ease-out;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px; /* standard navigation height */
  background-color: var(--navbar-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.brand-logo {
  font-size: 1.4rem;
  color: var(--accent-color);
  display: inline-block;
  animation: pulseLogo 3s ease-in-out infinite;
}

.brand-text {
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-item {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-item::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-color);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-item:hover, 
.nav-item.active {
  color: var(--accent-color);
}

.nav-item:hover::after,
.nav-item.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Selector Widget Styling */
.theme-selector-container {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px 8px 4px 12px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-selector-container:hover {
  border-color: var(--border-hover);
}

/* Language Selector Widget Styling */
.lang-selector-container {
  display: flex;
  align-items: center;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.lang-selector-container:hover {
  border-color: var(--border-hover);
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: calc(var(--radius-md) - 2px);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background-color: var(--accent-color);
  color: #ffffff !important;
}

.theme-options {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--dot-color);
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
  position: relative;
}

.theme-dot::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border: 1px solid transparent;
  border-radius: 50%;
  transition: border-color var(--transition-fast);
}

.theme-dot:hover {
  transform: scale(1.15);
}

.theme-dot.active::after {
  border-color: var(--accent-color);
}

.theme-mode-btn {
  background: none;
  border: none;
  border-left: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 32px;
  height: 32px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
  padding: 0;
  padding-left: 8px;
  margin-left: 4px;
}

.theme-mode-btn:hover {
  color: var(--accent-color);
}

.mode-icon {
  font-size: 1.15rem;
  transition: transform var(--transition-slow);
}

.theme-mode-btn:active .mode-icon {
  transform: scale(0.8) rotate(45deg);
}

/* Control Panel specific sizing */
.panel-selector {
  width: 100%;
  justify-content: space-between;
  box-shadow: none;
  background-color: var(--bg-primary);
  border-color: var(--border-color);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding-top: 1.5rem;
  padding-bottom: 1rem;
  text-align: center;
  background: radial-gradient(circle at top, var(--accent-soft), transparent 65%);
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

/* Hero Stats Panel */
.hero-stats {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-top: 2.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 12px 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.hero-stats:hover {
  border-color: var(--border-hover);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-num {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-color);
  line-height: 1.1;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.stat-divider {
  width: 1px;
  height: 28px;
  background-color: var(--border-color);
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-color);
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: inline-block;
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn:active {
  transform: scale(0.98); /* Tactile Feedback */
}

.btn-primary {
  background-color: var(--accent-color);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  box-shadow: var(--shadow-accent);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-tertiary);
}

/* ==========================================================================
   Gallery Section
   ========================================================================== */
.gallery-section {
  padding: 2rem 0 6rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

/* Section Header - clean vertical stacking */
.section-header {
  max-width: 600px;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

.section-description {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* Toolbar: Search and Category Tags */
.gallery-toolbar {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .gallery-toolbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.search-wrapper {
  position: relative;
  width: 100%;
  max-width: 320px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

#searchInput {
  width: 100%;
  height: 44px;
  padding: 0 16px 0 40px;
  font-size: 0.9rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#searchInput:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background-color: var(--bg-secondary);
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-btn {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.filter-btn.active {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #ffffff;
}

/* ==========================================================================
   Motion Grid & Card Designs
   ========================================================================== */
.motion-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 32px;
  transition: opacity var(--transition-normal);
}

@media (min-width: 640px) {
  .motion-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .motion-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.motion-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-slow);
}

.motion-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
}

/* Card Visual Preview Canvas */
.preview-canvas {
  height: 180px;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

/* Card Content Area */
.card-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-tag {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-color);
  background-color: var(--accent-soft);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.card-title-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.card-title-zh {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card-title-en {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 24px;
  flex-grow: 1;
}

/* Card Actions */
.card-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-top: auto;
}

.btn-copy-prompt {
  width: 36px;
  height: 36px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-copy-prompt:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background-color: var(--accent-soft);
}

.btn-copy-prompt:active {
  transform: scale(0.92);
}

.copy-icon {
  font-size: 0.95rem;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 0;
  grid-column: 1 / -1;
}

.empty-state-icon {
  font-size: 3rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  animation: floatEmpty 3s ease-in-out infinite;
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   Simulated Animation Canvas Previews (Keyframes)
   ========================================================================== */

/* 1. Fade In Up Demo */
.preview-fade-up {
  width: 60px;
  height: 60px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  animation: keyframe-fade-in-up 2.5s cubic-bezier(0.16, 1, 0.3, 1) infinite;
  box-shadow: var(--shadow-md);
}

@keyframes keyframe-fade-in-up {
  0% {
    opacity: 0;
    transform: translateY(16px);
  }
  20%, 80% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-16px);
  }
}

/* 2. Parallax Scrolling Demo */
.preview-parallax-container {
  position: relative;
  width: 120px;
  height: 90px;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 10px;
}

.preview-parallax-bg {
  position: absolute;
  top: 15px;
  left: 20px;
  right: 20px;
  height: 35px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  animation: keyframe-parallax-bg 3s ease-in-out infinite;
}

.preview-parallax-fg {
  position: relative;
  height: 25px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-color);
  box-shadow: var(--shadow-sm);
  animation: keyframe-parallax-fg 3s ease-in-out infinite;
}

@keyframes keyframe-parallax-bg {
  0%, 100% {
    transform: translateY(4px);
  }
  50% {
    transform: translateY(-4px);
  }
}

@keyframes keyframe-parallax-fg {
  0%, 100% {
    transform: translateY(8px);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* 3. Hover Scale Demo */
.preview-hover-scale {
  width: 80px;
  height: 55px;
  border-radius: var(--radius-md);
  background-color: var(--accent-color);
  box-shadow: var(--shadow-md);
  animation: keyframe-hover-scale 2.2s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-hover-scale {
  0%, 20%, 80%, 100% {
    transform: scale(1);
    box-shadow: var(--shadow-md);
  }
  40%, 60% {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg), var(--shadow-accent);
  }
}

/* 4. Magnetic Effect Demo */
.preview-magnetic-container {
  position: relative;
  width: 140px;
  height: 80px;
}

.preview-magnetic-target {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--accent-color);
  animation: keyframe-magnetic-button 3s ease-in-out infinite;
}

.preview-magnetic-cursor {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--text-primary);
  border: 1px solid var(--bg-secondary);
  box-shadow: var(--shadow-sm);
  animation: keyframe-magnetic-cursor 3s ease-in-out infinite;
}

@keyframes keyframe-magnetic-cursor {
  0%, 100% {
    top: 10%;
    left: 10%;
  }
  30%, 70% {
    top: 45%;
    left: 45%;
  }
}

@keyframes keyframe-magnetic-button {
  0%, 25%, 75%, 100% {
    transform: translate(-50%, -50%);
  }
  35%, 65% {
    transform: translate(-30%, -30%); /* attracted to cursor */
  }
}

/* 5. Underline Slide Demo */
.preview-underline-text {
  font-size: 1.1rem;
  font-weight: 700;
  position: relative;
  color: var(--text-primary);
  padding-bottom: 6px;
}

.preview-underline-line {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background-color: var(--accent-color);
  animation: keyframe-underline-slide 2.5s ease-in-out infinite;
}

@keyframes keyframe-underline-slide {
  0%, 100% {
    width: 0%;
    left: 0%;
  }
  40%, 70% {
    width: 100%;
    left: 0%;
  }
}

/* 6. Sticky Position Demo */
.preview-sticky-container {
  width: 140px;
  height: 90px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  display: flex;
  overflow: hidden;
}

.preview-sticky-left {
  width: 45%;
  border-right: 1px solid var(--border-color);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-sticky-box {
  width: 100%;
  height: 25px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-color);
  transform: translateY(0);
  /* Stays locked in center */
}

.preview-sticky-right {
  width: 55%;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: keyframe-sticky-right 4s linear infinite;
}

.preview-sticky-item {
  width: 100%;
  height: 16px;
  border-radius: 4px;
  background-color: var(--bg-tertiary);
  flex-shrink: 0;
}

@keyframes keyframe-sticky-right {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-38px);
  }
}

/* 7. Blur Reveal Demo */
.preview-blur-in {
  width: 60px;
  height: 60px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  animation: keyframe-blur-in 2.6s ease-in-out infinite;
}

@keyframes keyframe-blur-in {
  0%, 100% {
    filter: blur(8px);
    opacity: 0;
    transform: scale(0.9);
  }
  35%, 75% {
    filter: blur(0);
    opacity: 1;
    transform: scale(1);
  }
}

/* 8. Spring Bounce Demo */
.preview-spring-box {
  width: 55px;
  height: 55px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  transform-origin: bottom center;
  animation: keyframe-spring-bounce 2.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) infinite;
}

@keyframes keyframe-spring-bounce {
  0%, 100% {
    transform: translateY(0) scaleY(1);
  }
  15% {
    transform: translateY(4px) scaleY(0.85);
  }
  30% {
    transform: translateY(-20px) scaleY(1.1);
  }
  45% {
    transform: translateY(0) scaleY(0.95);
  }
  60% {
    transform: translateY(-3px) scaleY(1.02);
  }
  75% {
    transform: translateY(0) scaleY(1);
  }
}

/* Hover Lift Demo */
.preview-hover-lift {
  width: 60px;
  height: 60px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  animation: keyframe-hover-lift 2.2s ease-in-out infinite;
}

@keyframes keyframe-hover-lift {
  0%, 100% {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
  }
  50% {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
  }
}

/* 9. Scroll Reveal Demo */
.preview-scroll-reveal {
  width: 50px;
  height: 50px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  animation: keyframe-scroll-reveal 3s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-scroll-reveal {
  0%, 15%, 85%, 100% {
    opacity: 0;
    transform: translateY(24px) scale(0.95);
  }
  35%, 65% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 10. Line Reveal Demo */
.preview-line-reveal {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-weight: 700;
  font-size: 1rem;
}

.preview-line-reveal span {
  display: inline-block;
  overflow: hidden;
  position: relative;
  color: var(--text-primary);
  animation: keyframe-line-reveal-text 3s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

.preview-line-reveal span:nth-child(2) {
  animation-delay: 150ms;
}

@keyframes keyframe-line-reveal-text {
  0%, 10%, 90%, 100% {
    transform: translateY(100%);
    opacity: 0;
  }
  30%, 70% {
    transform: translateY(0);
    opacity: 1;
  }
}

/* 11. Reduced Motion Demo */
.preview-reduced-motion {
  display: flex;
  gap: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.preview-reduced-motion span {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-color);
  color: #fff;
}

.preview-reduced-motion span:first-child {
  animation: keyframe-spin-badge 4s linear infinite;
}

.preview-reduced-motion span:last-child {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

@keyframes keyframe-spin-badge {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 12. Scroll Progress Demo */
.preview-scroll-progress-demo {
  width: 120px;
  height: 8px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.preview-scroll-progress-line {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background-color: var(--accent-color);
  animation: keyframe-scroll-progress 3s ease-in-out infinite;
}

@keyframes keyframe-scroll-progress {
  0%, 100% { width: 0%; }
  50% { width: 100%; }
}

/* 13. Horizontal Gallery Demo */
.preview-horizontal-container {
  width: 140px;
  height: 60px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 0 10px;
}

.preview-horizontal-track {
  display: flex;
  gap: 12px;
  animation: keyframe-horizontal-scroll 4s ease-in-out infinite;
}

.preview-horizontal-track div {
  width: 45px;
  height: 40px;
  background-color: var(--accent-color);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

@keyframes keyframe-horizontal-scroll {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-65px); }
}

/* 14. Scroll Shadow Demo */
.preview-scroll-shadow-demo {
  width: 130px;
  height: 90px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-primary);
  position: relative;
}

.preview-scroll-shadow-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 26px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  z-index: 2;
  transition: all var(--transition-fast);
  animation: keyframe-header-shadow 3s ease-in-out infinite;
}

.preview-scroll-shadow-body {
  height: 150px;
  background: repeating-linear-gradient(0deg, var(--bg-tertiary) 0px, var(--bg-tertiary) 10px, transparent 10px, transparent 20px);
  animation: keyframe-body-scroll 3s ease-in-out infinite;
}

@keyframes keyframe-header-shadow {
  0%, 20%, 80%, 100% {
    box-shadow: none;
    border-bottom-color: transparent;
  }
  40%, 60% {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    border-bottom-color: var(--border-color);
  }
}

@keyframes keyframe-body-scroll {
  0%, 20%, 80%, 100% { transform: translateY(0); }
  40%, 60% { transform: translateY(-40px); }
}

/* 15. Infinite Marquee Demo */
.preview-marquee-wrapper {
  width: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 0;
}

.preview-marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: keyframe-marquee 6s linear infinite;
}

.preview-marquee-track span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-color);
  letter-spacing: 0.05em;
}

@keyframes keyframe-marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* 16. Hover Shadow Demo */
.preview-hover-shadow {
  width: 75px;
  height: 50px;
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  animation: keyframe-hover-shadow-lift 2.5s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-hover-shadow-lift {
  0%, 20%, 80%, 100% {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
    border-color: var(--border-color);
  }
  40%, 60% {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-accent);
    border-color: var(--border-hover);
  }
}

/* 17. Custom Cursor Demo */
.preview-cursor-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.preview-cursor-dot {
  position: absolute;
  width: 6px;
  height: 6px;
  background-color: var(--accent-color);
  border-radius: 50%;
  z-index: 3;
  transform: translate(-50%, -50%);
  animation: keyframe-cursor-path 3.5s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

.preview-cursor-circle {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 1px solid var(--accent-color);
  border-radius: 50%;
  z-index: 2;
  transform: translate(-50%, -50%);
  animation: keyframe-cursor-path-delayed 3.5s cubic-bezier(0.1, 0.8, 0.4, 1) infinite;
}

@keyframes keyframe-cursor-path {
  0%, 100% { top: 30%; left: 30%; }
  25% { top: 30%; left: 70%; }
  50% { top: 70%; left: 70%; }
  75% { top: 70%; left: 30%; }
}

@keyframes keyframe-cursor-path-delayed {
  0%, 100% { top: 30%; left: 30%; }
  25% { top: 30%; left: 70%; }
  50% { top: 70%; left: 70%; }
  75% { top: 70%; left: 30%; }
}

/* 18. Tilt Card Demo */
.preview-tilt-card {
  perspective: 400px;
}

.preview-tilt-inner {
  width: 80px;
  height: 55px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.8rem;
  animation: keyframe-tilt 4s ease-in-out infinite;
}

@keyframes keyframe-tilt {
  0%, 100% { transform: rotateY(0deg) rotateX(0deg); }
  25% { transform: rotateY(15deg) rotateX(10deg); }
  50% { transform: rotateY(-15deg) rotateX(-10deg); }
  75% { transform: rotateY(-10deg) rotateX(15deg); }
}

/* 19. Menu Morphing Demo */
.preview-morphing-btn {
  width: 28px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.preview-morphing-line {
  height: 3px;
  width: 100%;
  background-color: var(--text-primary);
  border-radius: 2px;
  transform-origin: center;
  transition: all var(--transition-normal);
  animation: keyframe-morphing 3s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-morphing {
  0%, 15%, 85%, 100% {
    transform: none;
    opacity: 1;
  }
  35%, 65% {
    /* Morph to X */
  }
}

.preview-morphing-line.line-1 {
  animation: keyframe-morph-1 3s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}
.preview-morphing-line.line-2 {
  animation: keyframe-morph-2 3s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}
.preview-morphing-line.line-3 {
  animation: keyframe-morph-3 3s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-morph-1 {
  0%, 15%, 85%, 100% { transform: translateY(0) rotate(0deg); }
  35%, 65% { transform: translateY(8.5px) rotate(45deg); }
}
@keyframes keyframe-morph-2 {
  0%, 15%, 85%, 100% { opacity: 1; }
  35%, 65% { opacity: 0; }
}
@keyframes keyframe-morph-3 {
  0%, 15%, 85%, 100% { transform: translateY(0) rotate(0deg); }
  35%, 65% { transform: translateY(-8.5px) rotate(-45deg); }
}

/* 20. Theme Switch Demo */

.preview-theme-switch {
  width: 120px;
  height: 60px;
  border: 1px solid var(--border-color);
  border-radius: 30px;
  background-color: var(--bg-primary);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.preview-theme-btn {
  position: absolute;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--accent-color);
  z-index: 3;
  animation: keyframe-theme-toggle 3.5s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

.preview-theme-ripple {
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: var(--bg-tertiary);
  border-radius: 50%;
  z-index: 2;
  transform: scale(0);
  animation: keyframe-theme-ripple 3.5s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

@keyframes keyframe-theme-toggle {
  0%, 15%, 85%, 100% { left: 10px; background-color: var(--accent-color); }
  35%, 65% { left: 86px; background-color: #f59e0b; }
}

@keyframes keyframe-theme-ripple {
  0%, 15%, 85%, 100% { transform: scale(0); opacity: 0; left: 15px; }
  30% { transform: scale(25); opacity: 1; left: 15px; }
  35%, 65% { transform: scale(25); opacity: 1; left: 90px; }
  80% { transform: scale(0); opacity: 0; left: 90px; }
}

/* 21. Button Ripple Demo */
.preview-ripple-btn {
  width: 90px;
  height: 40px;
  background-color: var(--accent-color);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.preview-ripple-wave {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.6);
  transform: translate(-50%, -50%) scale(0);
  animation: keyframe-ripple 2.5s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-ripple {
  0%, 15% { transform: translate(-50%, -50%) scale(0); opacity: 0.8; }
  45%, 100% { transform: translate(-50%, -50%) scale(5); opacity: 0; }
}

/* 22. Color Transition Demo */
.preview-color-transition {
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
  background-color: var(--bg-primary);
  animation: keyframe-color-trans 3s ease-in-out infinite;
}

@keyframes keyframe-color-trans {
  0%, 15%, 85%, 100% {
    background-color: var(--bg-primary);
    border-color: var(--border-color);
    color: var(--text-primary);
  }
  35%, 65% {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
  }
}

/* 23. Count Up Demo */
.preview-count-box {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent-color);
}

/* 24. Image Zoom Demo */
.preview-image-zoom {
  width: 120px;
  height: 80px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.preview-image-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent-color));
  animation: keyframe-image-zoom 2.5s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-image-zoom {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.25); }
}

/* 25. Saturation Shift Demo */
.preview-color-shift {
  width: 120px;
  height: 80px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.preview-color-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, #10b981, #f59e0b, #ec4899);
  animation: keyframe-color-shift 3s ease-in-out infinite;
}

@keyframes keyframe-color-shift {
  0%, 15%, 85%, 100% { filter: grayscale(100%) opacity(0.5); }
  35%, 65% { filter: grayscale(0%) opacity(1); }
}

/* 26. Mask Reveal Demo */
.preview-mask-reveal {
  width: 110px;
  height: 70px;
  background: linear-gradient(135deg, var(--accent-color), #8b5cf6);
  border-radius: var(--radius-md);
  animation: keyframe-mask-reveal 3s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-mask-reveal {
  0%, 15%, 85%, 100% { clip-path: inset(0 100% 0 0 round var(--radius-md)); }
  35%, 65% { clip-path: inset(0 0 0 0 round var(--radius-md)); }
}

/* 27. Hover Image Preview Demo */
.preview-image-follow-text {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  position: relative;
  padding: 6px 12px;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
}

.preview-image-follow-box {
  position: absolute;
  width: 35px;
  height: 25px;
  border-radius: 4px;
  background-color: var(--accent-color);
  box-shadow: var(--shadow-md);
  animation: keyframe-img-follow 3.5s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-img-follow {
  0%, 15%, 85%, 100% { transform: translate(0, 20px) scale(0); opacity: 0; }
  35%, 65% { transform: translate(40px, -15px) scale(1); opacity: 1; }
}

/* 28. Layout Transition Demo */
.preview-layout-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  width: 100px;
  height: 70px;
}

.preview-layout-container div {
  background-color: var(--accent-color);
  border-radius: 4px;
  transition: all var(--transition-normal);
}

.preview-layout-container div:nth-child(1) { animation: keyframe-layout-grid-1 3.5s ease-in-out infinite; }
.preview-layout-container div:nth-child(2) { animation: keyframe-layout-grid-2 3.5s ease-in-out infinite; }
.preview-layout-container div:nth-child(3) { animation: keyframe-layout-grid-3 3.5s ease-in-out infinite; }
.preview-layout-container div:nth-child(4) { animation: keyframe-layout-grid-4 3.5s ease-in-out infinite; }

@keyframes keyframe-layout-grid-1 {
  0%, 15%, 85%, 100% { transform: translate(0, 0); }
  35%, 65% { transform: translate(54px, 39px); }
}
@keyframes keyframe-layout-grid-2 {
  0%, 15%, 85%, 100% { transform: translate(0, 0); }
  35%, 65% { transform: translate(-54px, 0); }
}
@keyframes keyframe-layout-grid-3 {
  0%, 15%, 85%, 100% { transform: translate(0, 0); }
  35%, 65% { transform: translate(54px, -39px); }
}
@keyframes keyframe-layout-grid-4 {
  0%, 15%, 85%, 100% { transform: translate(0, 0); }
  35%, 65% { transform: translate(-54px, 0); }
}

/* 29. Page Transition Demo */
.preview-page-transition {
  width: 120px;
  height: 80px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  overflow: hidden;
  position: relative;
}

.preview-page-curtain {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--accent-color);
  transform: translateY(-100%);
  animation: keyframe-page-curtain 3s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

@keyframes keyframe-page-curtain {
  0%, 100% { transform: translateY(-100%); }
  40%, 60% { transform: translateY(0); }
}

/* 30. Accordion Demo */
.preview-accordion {
  width: 120px;
  height: 80px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  padding: 8px;
  display: flex;
  flex-direction: column;
}

.preview-accordion-header {
  font-size: 0.7rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 4px;
  margin-bottom: 4px;
}

.preview-accordion-content {
  width: 100%;
  background-color: var(--accent-soft);
  border-radius: 4px;
  animation: keyframe-accordion-expand 2.8s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes keyframe-accordion-expand {
  0%, 15%, 85%, 100% { height: 0px; opacity: 0; }
  35%, 65% { height: 42px; opacity: 1; }
}


/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ==========================================================================
   Toast Notification Banner
   ========================================================================== */
.toast-notification {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1000;
  opacity: 0;
  transform: translateY(12px) scale(0.95);
  transition: opacity var(--transition-fast), transform var(--transition-fast), background-color var(--transition-normal);
  pointer-events: none;
}

.toast-notification.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.toast-icon {
  color: #10b981;
  font-weight: 700;
}

.toast-message {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ==========================================================================
   Animations & Accessibility
   ========================================================================== */
@keyframes pulseLogo {
  0%, 100% {
    transform: scale(1) rotate(0deg);
  }
  50% {
    transform: scale(1.15) rotate(10deg);
  }
}

@keyframes floatEmpty {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* Accessibility: Support System Reduced Motion Configs */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-delay: 0s !important;
    animation-duration: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0s !important;
    scroll-behavior: auto !important;
    transform: none !important;
  }
  
  .brand-logo,
  .preview-fade-up,
  .preview-parallax-bg,
  .preview-parallax-fg,
  .preview-hover-scale,
  .preview-hover-lift,
  .preview-magnetic-target,
  .preview-magnetic-cursor,
  .preview-underline-line,
  .preview-sticky-right,
  .preview-blur-in,
  .preview-spring-box,
  .preview-scroll-reveal,
  .preview-line-reveal span,
  .preview-reduced-motion span,
  .preview-scroll-progress-line,
  .preview-horizontal-track,
  .preview-scroll-shadow-header,
  .preview-scroll-shadow-body,
  .preview-marquee-track,
  .preview-hover-shadow,
  .preview-cursor-dot,
  .preview-cursor-circle,
  .preview-tilt-inner,
  .preview-morphing-line,
  .preview-theme-btn,
  .preview-theme-ripple,
  .preview-ripple-wave,
  .preview-color-transition,
  .preview-image-inner,
  .preview-color-inner,
  .preview-mask-reveal,
  .preview-image-follow-box,
  .preview-layout-container div,
  .preview-page-curtain,
  .preview-accordion-content,
  .empty-state-icon {
    animation: none !important;
    transform: none !important;
    filter: none !important;
    opacity: 1 !important;
  }
  
  .motion-card:hover {
    transform: none !important;
  }
  
  .preview-underline-line {
    width: 100% !important;
  }
}