/* ============================================
   USConf.com - Production CSS
   Modern, Performance-Optimized Stylesheet
   ============================================ */

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

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

body {
  line-height: 1.6;
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ============================================
   CSS VARIABLES - LIGHT MODE (DEFAULT)
   ============================================ */
:root {
  /* Colors - Light Mode */
  --color-primary: #0066FF;
  --color-primary-dark: #0052CC;
  --color-primary-light: #4D94FF;
  --color-secondary: #6366F1;
  --color-accent: #EC4899;

  --color-bg: #FFFFFF;
  --color-bg-secondary: #F9FAFB;
  --color-bg-tertiary: #F3F4F6;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;

  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-text-tertiary: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-hero: linear-gradient(180deg, #FFFFFF 0%, #F9FAFB 100%);

  /* 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);

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Courier New', monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* 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);

  /* Layout */
  --container-max-width: 1280px;
  --header-height: 72px;
}

/* ============================================
   DARK MODE
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0F172A;
    --color-bg-secondary: #1E293B;
    --color-bg-tertiary: #334155;
    --color-surface: #1E293B;
    --color-surface-elevated: #334155;

    --color-text: #F1F5F9;
    --color-text-secondary: #CBD5E1;
    --color-text-tertiary: #94A3B8;
    --color-border: #334155;
    --color-border-light: #475569;

    --gradient-hero: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
  }
}

/* Dark mode toggle override */
[data-theme="dark"] {
  --color-bg: #0F172A;
  --color-bg-secondary: #1E293B;
  --color-bg-tertiary: #334155;
  --color-surface: #1E293B;
  --color-surface-elevated: #334155;

  --color-text: #F1F5F9;
  --color-text-secondary: #CBD5E1;
  --color-text-tertiary: #94A3B8;
  --color-border: #334155;
  --color-border-light: #475569;

  --gradient-hero: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: var(--font-system);
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   TYPOGRAPHY UTILITIES
   ============================================ */
.text-display {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.text-h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.text-h3 {
  font-size: clamp(1.25rem, 2vw, 1.875rem);
  font-weight: 600;
  line-height: 1.4;
}

.text-h4 {
  font-size: clamp(1.125rem, 1.5vw, 1.5rem);
  font-weight: 600;
  line-height: 1.4;
}

.text-body-lg {
  font-size: 1.125rem;
  line-height: 1.75;
}

.text-body {
  font-size: 1rem;
  line-height: 1.6;
}

.text-body-sm {
  font-size: 0.875rem;
  line-height: 1.5;
}

.text-caption {
  font-size: 0.75rem;
  line-height: 1.4;
  letter-spacing: 0.01em;
}

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-center { text-align: center; }
.text-semibold { font-weight: 600; }
.text-bold { font-weight: 700; }

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

.container-narrow {
  max-width: 960px;
}

.section {
  padding-top: var(--spacing-3xl);
  padding-bottom: var(--spacing-3xl);
}

.section-sm {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

/* ============================================
   FLEXBOX UTILITIES
   ============================================ */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }
.gap-2xl { gap: var(--spacing-2xl); }

/* ============================================
   GRID UTILITIES
   ============================================ */
.grid { display: grid; }

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-cols-3, .grid-cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Bento Box Grid - Asymmetric, Modern Layout */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  grid-auto-flow: dense;
}

.bento-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  contain: layout style paint;
}

.bento-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.bento-item-large {
  grid-column: span 2;
}

@media (max-width: 768px) {
  .bento-item-large {
    grid-column: span 1;
  }
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
  transition: all var(--transition-base);
}

[data-theme="dark"] .header {
  background: rgba(15, 23, 42, 0.8);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.8;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-text);
}

.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%;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  text-align: center;
}

.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-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

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

.btn-ghost:hover {
  color: var(--color-text);
  background: var(--color-bg-tertiary);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  background: var(--gradient-hero);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(102, 126, 234, 0.05) 0%, transparent 70%);
  animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.6;
}

/* ============================================
   SEARCH BAR
   ============================================ */
.search-bar {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  max-width: 700px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.search-bar:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1), var(--shadow-xl);
}

.search-icon {
  color: var(--color-text-tertiary);
  padding-left: var(--spacing-sm);
  font-size: 1.25rem;
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.75rem;
  font-size: 1rem;
  outline: none;
  color: var(--color-text);
}

.search-input::placeholder {
  color: var(--color-text-tertiary);
}

/* ============================================
   FILTERS
   ============================================ */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  padding: var(--spacing-lg) 0;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  min-width: 180px;
}

.filter-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.filter-select {
  padding: 0.625rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-base);
}

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

.filter-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

/* ============================================
   EVENT CARDS
   ============================================ */
.event-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
  contain: layout style paint;
}

.event-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-light);
}

.event-card-image {
  width: 100%;
  height: 200px;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--color-bg-tertiary);
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.event-card-image.loaded {
  opacity: 1;
}

.event-card-content {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.event-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.event-category {
  display: inline-flex;
  padding: 0.25rem 0.75rem;
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-secondary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.event-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.event-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.event-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.event-description {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.event-footer {
  margin-top: auto;
  padding-top: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border-light);
}

/* ============================================
   FORM ELEMENTS
   ============================================ */
.form-group {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1rem;
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1);
}

.form-input:focus + .form-label,
.form-textarea:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label,
.form-textarea:not(:placeholder-shown) + .form-label {
  top: -0.5rem;
  left: 0.75rem;
  font-size: 0.75rem;
  color: var(--color-primary);
  background: var(--color-surface);
  padding: 0 0.25rem;
}

.form-label {
  position: absolute;
  top: 1rem;
  left: 1rem;
  color: var(--color-text-tertiary);
  pointer-events: none;
  transition: all var(--transition-base);
  font-size: 1rem;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

.form-success {
  color: var(--color-success);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

@media (max-width: 1024px) {
  .sidebar-layout {
    grid-template-columns: 1fr;
  }
}

.sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  position: sticky;
  top: calc(var(--header-height) + var(--spacing-lg));
  contain: layout style paint;
}

.sidebar-section {
  margin-bottom: var(--spacing-xl);
}

.sidebar-section:last-child {
  margin-bottom: 0;
}

.sidebar-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.sidebar-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-item:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}

.sidebar-item.active {
  background: rgba(0, 102, 255, 0.1);
  color: var(--color-primary);
  font-weight: 600;
}

.sidebar-count {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
}

/* ============================================
   DIRECTORY TABLE
   ============================================ */
.directory-table {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.directory-table table {
  width: 100%;
  border-collapse: collapse;
}

.directory-table thead {
  background: var(--color-bg-secondary);
  border-bottom: 2px solid var(--color-border);
}

.directory-table th {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.directory-table td {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text);
}

.directory-table tbody tr {
  transition: background var(--transition-fast);
}

.directory-table tbody tr:hover {
  background: var(--color-bg-secondary);
}

.directory-table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================
   DARK MODE TOGGLE
   ============================================ */
.theme-toggle {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  font-size: 1.25rem;
}

.theme-toggle:hover {
  background: var(--color-bg-tertiary);
  transform: scale(1.05);
}

/* ============================================
   GLASSMORPHISM EFFECTS
   ============================================ */
.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .glass {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden { display: none; }
.visible { display: block; }
.opacity-0 { opacity: 0; }
.opacity-100 { opacity: 1; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.relative { position: relative; }
.absolute { position: absolute; }
.mt-auto { margin-top: auto; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* ============================================
   LOADING STATES
   ============================================ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 0%,
    var(--color-border-light) 50%,
    var(--color-bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================
   FADE IN ANIMATION
   ============================================ */
.fade-in {
  animation: fadeIn var(--transition-slow) ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */
.contain-layout { contain: layout; }
.contain-style { contain: style; }
.contain-paint { contain: paint; }
.contain-content { contain: content; }

.content-visibility-auto {
  content-visibility: auto;
  contain-intrinsic-size: 0 500px;
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 768px) {
  .hide-mobile { display: none; }
  .section { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }
  .hero { padding: var(--spacing-xl) 0; }
  .container { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
}

@media (min-width: 769px) {
  .hide-desktop { display: none; }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .header, .filters, .theme-toggle, .btn { display: none; }
  .event-card, .directory-table { break-inside: avoid; }
}