/* ============================================
   DESIGN SYSTEM - CSS Variables
   ============================================ */
:root {
  /* Colors - Primary Palette */
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  
  --color-secondary: #8b5cf6;
  --color-secondary-light: #a78bfa;
  --color-secondary-dark: #7c3aed;
  
  --color-accent: #ec4899;
  --color-accent-light: #f472b6;
  --color-accent-dark: #db2777;
  
  /* Status Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  
  /* Neutral Colors */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;
  
  /* Semantic Colors */
  --color-text: var(--neutral-900);
  --color-text-light: var(--neutral-600);
  --color-text-lighter: var(--neutral-500);
  --color-background: #ffffff;
  --color-background-alt: var(--neutral-50);
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-border: var(--neutral-200);
  
  /* Spacing - 8px base grid */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
  
  --font-size-tiny: 12px;
  --font-size-small: 14px;
  --font-size-base: 16px;
  --font-size-large: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;
  --font-size-5xl: 48px;
  --font-size-6xl: 60px;
  --font-size-7xl: 72px;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Borders & Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-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);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
  /* Dark mode colors */
  --color-text: #f5f5f5;
  --color-text-light: #a3a3a3;
  --color-text-lighter: #737373;
  --color-background: #0a0a0a;
  --color-background-alt: #171717;
  --color-surface: #1a1a1a;
  --color-surface-elevated: #262626;
  --color-border: #333333;
  
  /* Slightly muted colors for dark mode */
  --color-primary: #818cf8;
  --color-primary-light: #a5b4fc;
  --color-primary-dark: #6366f1;
  
  --color-secondary: #a78bfa;
  --color-secondary-light: #c4b5fd;
  --color-secondary-dark: #8b5cf6;
  
  --color-accent: #f472b6;
  --color-accent-light: #f9a8d4;
  --color-accent-dark: #ec4899;
  
  /* Enhanced shadows for dark mode */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] code {
  background: var(--color-surface-elevated);
  color: var(--color-text);
}

[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #4338ca 0%, #6b21a8 100%);
}

[data-theme="dark"] .card {
  background: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .card__footer {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .form-input {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

[data-theme="dark"] .form-input::placeholder {
  color: var(--color-text-lighter);
}

[data-theme="dark"] .info-box {
  background: var(--color-surface);
  border-left-color: var(--color-primary);
}

[data-theme="dark"] .nav {
  background: rgba(10, 10, 10, 0.95);
  border-bottom-color: var(--color-border);
}

[data-theme="dark"] .nav__menu {
  background: var(--color-background);
}

[data-theme="dark"] .spacing-visual {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

[data-theme="dark"] .animation-box {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

[data-theme="dark"] .neutral-card {
  border-color: var(--color-border);
}

[data-theme="dark"] .btn--ghost:hover {
  background: var(--color-surface-elevated);
}

[data-theme="dark"] .typography-showcase > * {
  border-bottom-color: var(--color-border);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-base); }

.display-1 {
  font-size: var(--font-size-7xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
}

.display-2 {
  font-size: var(--font-size-6xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
}

p {
  margin-bottom: var(--space-md);
}

.text-large {
  font-size: var(--font-size-large);
  line-height: var(--line-height-relaxed);
}

.text-small {
  font-size: var(--font-size-small);
}

.text-tiny {
  font-size: var(--font-size-tiny);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--neutral-100);
  border-radius: var(--border-radius-sm);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
}

.section--alt {
  background-color: var(--color-background-alt);
}

.section__title {
  text-align: center;
  margin-bottom: var(--space-md);
}

.section__description {
  text-align: center;
  font-size: var(--font-size-large);
  color: var(--color-text-light);
  margin-bottom: var(--space-3xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.subsection__title {
  font-size: var(--font-size-2xl);
  margin: var(--space-3xl) 0 var(--space-xl);
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__brand {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
}

.nav__menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  margin: 0;
}

.nav__link {
  color: var(--color-text-light);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  z-index: 1001;
}

.nav__toggle-line {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(1) {
  transform: rotate(45deg) translateY(7px);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(3) {
  transform: rotate(-45deg) translateY(-7px);
}

/* ============================================
   THEME TOGGLE
   ============================================ */
.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--border-radius-md);
  padding: var(--space-sm);
  color: var(--color-text);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--neutral-100);
}

[data-theme="dark"] .theme-toggle:hover {
  background: var(--color-surface-elevated);
}

.theme-toggle__icon {
  position: absolute;
  transition: all var(--transition-base);
}

.theme-toggle__icon--sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-toggle__icon--moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle__icon--sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--space-4xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="50" height="50" patternUnits="userSpaceOnUse"><path d="M 50 0 L 0 0 0 50" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-size: var(--font-size-6xl);
  margin-bottom: var(--space-lg);
  animation: fadeSlideUp 0.8s var(--transition-base);
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2xl);
  opacity: 0.95;
  animation: fadeSlideUp 0.8s var(--transition-base) 0.1s backwards;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  animation: fadeSlideUp 0.8s var(--transition-base) 0.2s backwards;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  font-family: inherit;
  line-height: 1;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width var(--transition-base), height var(--transition-base);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: var(--color-secondary);
  color: white;
}

.btn--secondary:hover {
  background: var(--color-secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: white;
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
}

.btn--ghost:hover {
  background: var(--neutral-100);
}

.btn--sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-small);
}

.btn--lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-large);
}

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

/* ============================================
   COLOR DISPLAYS
   ============================================ */
.color-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-3xl);
}

.color-card {
  text-align: center;
  animation: fadeSlideUp 0.5s var(--transition-base);
}

.color-card:nth-child(1) { animation-delay: 0.05s; animation-fill-mode: backwards; }
.color-card:nth-child(2) { animation-delay: 0.1s; animation-fill-mode: backwards; }
.color-card:nth-child(3) { animation-delay: 0.15s; animation-fill-mode: backwards; }
.color-card:nth-child(4) { animation-delay: 0.2s; animation-fill-mode: backwards; }
.color-card:nth-child(5) { animation-delay: 0.25s; animation-fill-mode: backwards; }
.color-card:nth-child(6) { animation-delay: 0.3s; animation-fill-mode: backwards; }

.color-swatch {
  width: 100%;
  height: 120px;
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.color-swatch:hover {
  transform: translateY(-4px) scale(1.02);
}

.color-swatch--primary { background: var(--color-primary); }
.color-swatch--secondary { background: var(--color-secondary); }
.color-swatch--accent { background: var(--color-accent); }
.color-swatch--success { background: var(--color-success); }
.color-swatch--warning { background: var(--color-warning); }
.color-swatch--danger { background: var(--color-danger); }

.color-card__title {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
}

.color-card__value {
  font-family: var(--font-mono);
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  margin: 0;
}

.neutral-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--space-md);
}

.neutral-card {
  height: 80px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-fast);
}

.neutral-card:hover {
  transform: scale(1.05);
}

/* Neutral card backgrounds - fixed palette */
.neutral-card--50 { background: #fafafa; }
.neutral-card--100 { background: #f5f5f5; }
.neutral-card--200 { background: #e5e5e5; }
.neutral-card--300 { background: #d4d4d4; }
.neutral-card--400 { background: #a3a3a3; }
.neutral-card--500 { background: #737373; }
.neutral-card--600 { background: #525252; }
.neutral-card--700 { background: #404040; }
.neutral-card--800 { background: #262626; }
.neutral-card--900 { background: #171717; }

/* Text colors based on background lightness, not theme */
.neutral-card--50 .neutral-card__label,
.neutral-card--100 .neutral-card__label,
.neutral-card--200 .neutral-card__label,
.neutral-card--300 .neutral-card__label,
.neutral-card--400 .neutral-card__label {
  color: #171717;
}

.neutral-card--500 .neutral-card__label,
.neutral-card--600 .neutral-card__label,
.neutral-card--700 .neutral-card__label,
.neutral-card--800 .neutral-card__label,
.neutral-card--900 .neutral-card__label {
  color: #fafafa;
}

.neutral-card__label {
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-small);
}

/* ============================================
   TYPOGRAPHY SHOWCASE
   ============================================ */
.typography-showcase {
  max-width: 800px;
  margin: 0 auto;
}

.typography-showcase > * {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.typography-showcase > *:last-child {
  border-bottom: none;
}

/* ============================================
   SPACING SHOWCASE
   ============================================ */
.spacing-showcase {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.spacing-item {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.spacing-visual {
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--border-radius-sm);
  transition: width var(--transition-base);
}

.spacing-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-small);
  color: var(--color-text-light);
}

/* ============================================
   CARDS
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  position: relative;
}

.card--hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--featured {
  border-color: var(--color-primary);
  border-width: 2px;
}

.card__badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--color-primary);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

.card__header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.card__title {
  margin: 0;
}

.card__body {
  padding: var(--space-lg);
}

.card__body p {
  margin: 0;
  color: var(--color-text-light);
}

.card__footer {
  padding: var(--space-lg);
  background: var(--neutral-50);
  border-top: 1px solid var(--color-border);
}

/* ============================================
   FORMS
   ============================================ */
.component-group {
  margin-bottom: var(--space-3xl);
}

.component-group__title {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--color-border);
}

.component-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

.form-showcase {
  max-width: 500px;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.checkbox__label {
  font-size: var(--font-size-base);
  user-select: none;
}

/* ============================================
   BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  border-radius: var(--border-radius-full);
  transition: transform var(--transition-fast);
}

.badge:hover {
  transform: scale(1.05);
}

.badge--primary {
  background: var(--color-primary);
  color: white;
}

.badge--secondary {
  background: var(--color-secondary);
  color: white;
}

.badge--success {
  background: var(--color-success);
  color: white;
}

.badge--warning {
  background: var(--color-warning);
  color: white;
}

.badge--danger {
  background: var(--color-danger);
  color: white;
}

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

/* ============================================
   ANIMATIONS
   ============================================ */
.animation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.animation-demo {
  text-align: center;
}

.animation-box {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--space-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
}

.animation-demo__label {
  font-size: var(--font-size-small);
  color: var(--color-text-light);
  margin: 0;
}

/* Performance-optimized animations using transforms and opacity */
.animation-fade {
  animation: fadeIn 2s infinite;
}

.animation-slide-up {
  animation: slideUp 2s infinite;
}

.animation-scale {
  animation: scaleAnim 2s infinite;
}

.animation-rotate {
  animation: rotateAnim 3s infinite;
}

.animation-bounce {
  animation: bounceAnim 2s infinite;
}

.animation-pulse {
  animation: pulseAnim 2s infinite;
}

@keyframes fadeIn {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

@keyframes slideUp {
  0%, 100% { transform: translateY(10px); opacity: 0.7; }
  50% { transform: translateY(0); opacity: 1; }
}

@keyframes scaleAnim {
  0%, 100% { transform: scale(0.9); }
  50% { transform: scale(1); }
}

@keyframes rotateAnim {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes bounceAnim {
  0%, 100% { transform: translateY(0); }
  25% { transform: translateY(-10px); }
  50% { transform: translateY(0); }
  75% { transform: translateY(-5px); }
}

@keyframes pulseAnim {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.8; }
}

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

/* ============================================
   INFO BOX
   ============================================ */
.info-box {
  background: var(--neutral-50);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-lg);
  border-radius: var(--border-radius-md);
  margin-top: var(--space-xl);
}

.info-box h4 {
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.info-box p {
  margin: 0;
  color: var(--color-text-light);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--neutral-900);
  color: var(--neutral-300);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.footer p {
  margin: 0;
}

/* ============================================
   ACCESSIBILITY - Reduced Motion
   ============================================ */
@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;
  }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet and below */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .section {
    padding: var(--space-3xl) 0;
  }
  
  .color-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
}

/* Mobile landscape and below */
@media (max-width: 768px) {
  /* Navigation - Mobile Menu */
  .nav__toggle {
    display: flex;
  }
  
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-background);
    flex-direction: column;
    padding: var(--space-4xl) var(--space-lg);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-base);
    z-index: 1000;
    gap: 0;
  }
  
  .nav__menu.active {
    right: 0;
  }
  
  .nav__menu li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }
  
  .nav__link {
    display: block;
    padding: var(--space-md) 0;
    font-size: var(--font-size-large);
  }
  
  .nav__link::after {
    bottom: var(--space-md);
  }
  
  /* Overlay for mobile menu */
  body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 999;
  }
  
  body.menu-open::before {
    opacity: 1;
    visibility: visible;
  }
  
  body.menu-open {
    overflow: hidden;
  }
  
  /* Hero Section */
  .hero {
    padding: var(--space-3xl) 0;
  }
  
  .hero__title {
    font-size: var(--font-size-5xl);
  }
  
  .hero__subtitle {
    font-size: var(--font-size-large);
  }
  
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero__actions .btn {
    width: 100%;
  }
  
  /* Typography */
  .display-1 {
    font-size: var(--font-size-6xl);
  }
  
  .display-2 {
    font-size: var(--font-size-5xl);
  }
  
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
  h3 { font-size: var(--font-size-2xl); }
  
  /* Grids */
  .card-grid,
  .color-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .animation-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
  
  .neutral-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-sm);
  }
  
  /* Component spacing */
  .component-group {
    margin-bottom: var(--space-2xl);
  }
  
  .component-grid {
    gap: var(--space-sm);
  }
  
  /* Sections */
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .section__title {
    font-size: var(--font-size-4xl);
  }
  
  .section__description {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-2xl);
  }
}

/* Mobile portrait */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .hero__title {
    font-size: var(--font-size-4xl);
  }
  
  .hero__subtitle {
    font-size: var(--font-size-base);
  }
  
  .display-1 {
    font-size: var(--font-size-5xl);
  }
  
  .display-2 {
    font-size: var(--font-size-4xl);
  }
  
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  
  .section__title {
    font-size: var(--font-size-3xl);
  }
  
  .animation-grid {
    grid-template-columns: 1fr;
  }
  
  .neutral-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
  }
  
  .neutral-card {
    height: 60px;
  }
  
  .neutral-card__label {
    font-size: 10px;
  }
  
  .spacing-showcase {
    gap: var(--space-md);
  }
  
  .spacing-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  
  .btn {
    width: 100%;
  }
  
  .component-grid .btn {
    width: auto;
    flex: 1 1 auto;
    min-width: 100px;
  }
}

/* Large desktop */
@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
  }
  
  .hero__title {
    font-size: var(--font-size-7xl);
  }
  
  .section {
    padding: 120px 0;
  }
}

/* ============================================
   PERFORMANCE OPTIMIZATION
   ============================================ */
/* Use GPU acceleration for animated elements */
.btn,
.card,
.animation-box,
.color-swatch,
.neutral-card {
  will-change: transform;
}

/* Ensure smooth scrolling with containment */
.section {
  contain: layout style paint;
}

/* Optimize repaints */
.nav {
  will-change: background;
}