/* ==============================================
   MODERN UTILITY CLASSES
   Performance-optimized utilities using design tokens
   ============================================== */

/* ===== ACCESSIBILITY UTILITIES ===== */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.not-sr-only {
  position: static !important;
  width: auto !important;
  height: auto !important;
  padding: 0 !important;
  margin: 0 !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-weight-bold);
  z-index: var(--z-max);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* Focus states for better accessibility */
.focus-visible:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-base);
}

/* ===== LAYOUT UTILITIES ===== */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 480px) {
  .container { max-width: 480px; }
}

@media (min-width: 768px) {
  .container { 
    max-width: 768px;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container { 
    max-width: 1024px;
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

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

@media (min-width: 1536px) {
  .container { max-width: 1536px; }
}

/* Flexbox utilities with modern gap support */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }

/* Modern CSS 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)); }
.grid-cols-auto { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

.col-span-full { grid-column: 1 / -1; }
.col-span-2 { grid-column: span 2 / span 2; }
.col-span-3 { grid-column: span 3 / span 3; }

/* Gap utilities */
.gap-0 { gap: var(--space-0); }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

/* ===== MODERN TYPOGRAPHY ===== */
.text-hero {
  font-size: var(--font-size-7xl);
  font-weight: var(--font-weight-black);
  line-height: var(--leading-none);
  letter-spacing: -0.02em;
  text-shadow: var(--text-shadow-hero);
}

.text-display {
  font-size: var(--font-size-6xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--leading-tight);
  letter-spacing: -0.01em;
}

.text-heading-1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
}

.text-heading-2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-snug);
}

.text-heading-3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-snug);
}

.text-body-lg {
  font-size: var(--font-size-xl);
  line-height: var(--leading-relaxed);
}

.text-body {
  font-size: var(--font-size-base);
  line-height: var(--leading-normal);
}

.text-body-sm {
  font-size: var(--font-size-sm);
  line-height: var(--leading-normal);
}

.text-caption {
  font-size: var(--font-size-xs);
  line-height: var(--leading-normal);
}

/* RTL support */
.text-right { text-align: right; }
.text-left { text-align: left; }
.text-center { text-align: center; }

/* ===== COLOR UTILITIES ===== */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-white { color: var(--color-white); }
.text-gray-300 { color: var(--color-gray-300); }
.text-gray-400 { color: var(--color-gray-400); }
.text-gray-500 { color: var(--color-gray-500); }

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-accent { background-color: var(--color-accent); }
.bg-white { background-color: var(--color-white); }
.bg-gray-800 { background-color: var(--color-gray-800); }
.bg-gray-900 { background-color: var(--color-gray-900); }
.bg-black { background-color: var(--color-black); }

/* Gradient backgrounds */
.bg-gradient-primary { background: var(--gradient-primary); }
.bg-gradient-secondary { background: var(--gradient-secondary); }
.bg-gradient-hero { background: var(--gradient-hero); }

/* Glass morphism utilities */
.bg-glass-light {
  background: var(--bg-glass-light);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.bg-glass-medium {
  background: var(--bg-glass-medium);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.bg-glass-dark {
  background: var(--bg-glass-dark);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
}

/* ===== MODERN BUTTON STYLES ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  outline: none;
  position: relative;
  overflow: hidden;
  min-height: 44px; /* Touch target */
  font-family: var(--font-family-primary);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

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

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

.btn-secondary {
  background: var(--gradient-secondary);
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

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

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

/* Button sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-base {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--font-size-xl);
}

/* ===== FORM UTILITIES ===== */
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-glass-light);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  color: var(--color-white);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
  direction: rtl;
  text-align: right;
  min-height: 48px; /* Touch target */
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--bg-glass-medium);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-primary);
}

/* ===== ANIMATION UTILITIES ===== */
.animate-float {
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

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

.animate-slide-in-right {
  animation: slideInRight 0.8s var(--ease-bounce) forwards;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-pulse-glow {
  animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: var(--energy-pulse);
  }
  50% {
    box-shadow: var(--energy-pulse-active);
  }
}

/* ===== SPACING UTILITIES ===== */
.p-0 { padding: var(--space-0); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-10 { padding: var(--space-10); }
.p-12 { padding: var(--space-12); }

.m-0 { margin: var(--space-0); }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }
.m-auto { margin: auto; }

/* ===== RESPONSIVE UTILITIES ===== */
@media (max-width: 768px) {
  .mobile\:text-center { text-align: center; }
  .mobile\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .mobile\:flex-col { flex-direction: column; }
  .mobile\:p-4 { padding: var(--space-4); }
  .mobile\:gap-4 { gap: var(--space-4); }
  
  .text-hero {
    font-size: var(--font-size-4xl);
    line-height: var(--leading-tight);
  }
  
  .text-display {
    font-size: var(--font-size-3xl);
  }
  
  .text-heading-1 {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 480px) {
  .mobile-sm\:text-sm { font-size: var(--font-size-sm); }
  .mobile-sm\:p-2 { padding: var(--space-2); }
  .mobile-sm\:gap-2 { gap: var(--space-2); }
  
  .text-hero {
    font-size: var(--font-size-3xl);
  }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
.will-change-transform { will-change: transform; }
.will-change-opacity { will-change: opacity; }
.backface-hidden { backface-visibility: hidden; }
.perspective-1000 { perspective: 1000px; }

/* ===== TOUCH OPTIMIZATIONS ===== */
@media (hover: none) and (pointer: coarse) {
  .btn {
    min-height: 48px;
    min-width: 48px;
  }
  
  .form-input {
    min-height: 48px;
    font-size: 16px; /* Prevent zoom on iOS */
  }
  
  .touch\:scale-105:active {
    transform: scale(1.05);
  }
}

/* ===== DARK MODE OVERRIDES ===== */
@media (prefers-color-scheme: dark) {
  .form-input {
    background: rgba(255, 255, 255, 0.05);
  }
}

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
  .btn-primary {
    border: 2px solid var(--color-white);
  }
  
  .form-input {
    border-width: 3px;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .btn {
    background: transparent !important;
    color: black !important;
    border: 2px solid black !important;
    box-shadow: none !important;
  }
  
  .bg-glass-light,
  .bg-glass-medium,
  .bg-glass-dark {
    background: transparent !important;
    backdrop-filter: none !important;
  }
  
  .text-hero,
  .text-display,
  .text-heading-1,
  .text-heading-2,
  .text-heading-3 {
    text-shadow: none !important;
  }
}