/* Enhanced Styles for Fesstik - Performance & Modern UI */
/* Optimized for Core Web Vitals and Google AdSense */

:root {
  /* Enhanced Color Palette */
  --primary-gradient: linear-gradient(135deg, #68d391 0%, #4fd1c7 100%);
  --primary-color: #68d391;
  --primary-dark: #48bb78;
  --primary-light: #9ae6b4;
  --secondary-color: #4fd1c7;
  --accent-color: #f687b3;
  --text-primary: #2d3748;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --bg-primary: #ffffff;
  --bg-secondary: #f7fafc;
  --bg-tertiary: #edf2f7;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 6px 10px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.15);
  --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);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-light: #cbd5e0;
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-tertiary: #4a5568;
    --border-color: #4a5568;
  }
}

/* Performance Optimizations */
* {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Prevent layout shift */
img, video, iframe {
  max-width: 100%;
  height: auto;
  aspect-ratio: attr(width) / attr(height);
}

/* Loading skeleton animation */
@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #f8f8f8 50%, #f0f0f0 75%);
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
  border-radius: var(--radius-sm);
}

/* Smooth scroll behavior with offset for fixed header */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

/* Enhanced container with better responsive behavior */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container { 
    max-width: 640px;
    padding: 0 1.5rem;
  }
}

@media (min-width: 768px) {
  .container { 
    max-width: 768px;
    padding: 0 2rem;
  }
}

@media (min-width: 1024px) {
  .container { max-width: 1024px; }
}

@media (min-width: 1280px) {
  .container { max-width: 1280px; }
}

/* Modern Card Design */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-premium {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.card-premium::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.card-premium:hover::before {
  left: 100%;
}

/* Enhanced Buttons with Ripple Effect */
.btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(104, 211, 145, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(104, 211, 145, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

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

/* Ripple effect */
.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::after {
  width: 300px;
  height: 300px;
}

/* Advanced Form Styles */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(104, 211, 145, 0.1);
}

.form-input:invalid {
  border-color: #fc8181;
}

.form-input:valid {
  border-color: var(--primary-color);
}

/* Loading States */
.loading {
  position: relative;
  pointer-events: none;
  opacity: 0.6;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--primary-color);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.6s linear infinite;
}

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

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  transform: translateX(400px);
  transition: transform var(--transition-base);
  z-index: 9999;
  max-width: 350px;
}

.toast.show {
  transform: translateX(0);
}

.toast-success {
  border-left: 4px solid #48bb78;
}

.toast-error {
  border-left: 4px solid #fc8181;
}

.toast-warning {
  border-left: 4px solid #f6ad55;
}

.toast-info {
  border-left: 4px solid #4299e1;
}

/* Modern Tooltip */
.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip-text {
  visibility: hidden;
  width: 200px;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  text-align: center;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -100px;
  opacity: 0;
  transition: opacity var(--transition-fast);
  font-size: 0.875rem;
}

.tooltip-text::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: var(--text-primary) transparent transparent transparent;
}

.tooltip:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

/* Animated Progress Bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: var(--radius-xl);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: shimmer 2s infinite;
}

/* Smooth Accordion */
.accordion {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
}

.accordion-header {
  background: var(--bg-secondary);
  padding: 1rem 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

.accordion-header:hover {
  background: var(--bg-tertiary);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
  background: var(--bg-primary);
}

.accordion.active .accordion-content {
  max-height: 500px;
  padding: 1rem 1.5rem;
}

.accordion-icon {
  transition: transform var(--transition-base);
}

.accordion.active .accordion-icon {
  transform: rotate(180deg);
}

/* Modern Table Design */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.table th {
  background: var(--bg-tertiary);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
}

.table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

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

/* AdSense Ad Container Styles */
.ad-container {
  margin: 2rem 0;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  text-align: center;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.ad-container::before {
  content: 'Advertisement';
  position: absolute;
  top: -0.75rem;
  left: 1rem;
  background: var(--bg-secondary);
  padding: 0 0.5rem;
  font-size: 0.75rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Responsive Ad Units */
.ad-responsive {
  width: 100%;
  height: auto;
  min-height: 280px;
}

@media (min-width: 768px) {
  .ad-responsive {
    min-height: 90px;
  }
}

@media (min-width: 1024px) {
  .ad-responsive {
    min-height: 250px;
  }
}

/* In-article ad placement */
.ad-in-article {
  margin: 2rem auto;
  max-width: 680px;
}

/* Sticky sidebar ad */
.ad-sticky-sidebar {
  position: sticky;
  top: 100px;
}

/* Performance: Reduce motion for users who prefer it */
@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;
  }
}

/* Print Styles */
@media print {
  .navbar,
  .footer,
  .ad-container,
  .hamburger-menu,
  .back-to-top {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
  
  img, table {
    page-break-inside: avoid;
  }
}