/* ===== VARIABLES & THEMES ===== */
:root {
  /* Light Theme (Default) */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;
  
  --secondary-50: #fdf2f8;
  --secondary-100: #fce7f3;
  --secondary-200: #fbcfe8;
  --secondary-300: #f9a8d4;
  --secondary-400: #f472b6;
  --secondary-500: #ec4899;
  --secondary-600: #db2777;
  --secondary-700: #be185d;
  --secondary-800: #9d174d;
  --secondary-900: #831843;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  --white: #ffffff;
  --black: #000000;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-display: 'Clash Display', var(--font-sans);
  
  /* Z-index */
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal: 40;
  --z-popover: 50;
  --z-tooltip: 60;
  --z-toast: 70;
  --z-orb: 1000;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-50: #312e81;
  --primary-100: #3730a3;
  --primary-200: #4338ca;
  --primary-300: #4f46e5;
  --primary-400: #6366f1;
  --primary-500: #818cf8;
  --primary-600: #a5b4fc;
  --primary-700: #c7d2fe;
  --primary-800: #e0e7ff;
  --primary-900: #eef2ff;
  
  --gray-50: #0f172a;
  --gray-100: #1e293b;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748b;
  --gray-500: #94a3b8;
  --gray-600: #cbd5e1;
  --gray-700: #e2e8f0;
  --gray-800: #f1f5f9;
  --gray-900: #f8fafc;
  
  --white: #0f172a;
  --black: #ffffff;
  
  --shadow-sm: 0 1px 2px 0 rgba(255, 255, 255, 0.05);
  --shadow: 0 4px 6px -1px rgba(255, 255, 255, 0.1), 0 2px 4px -1px rgba(255, 255, 255, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(255, 255, 255, 0.1), 0 10px 10px -5px rgba(255, 255, 255, 0.04);
}

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

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

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--gray-800);
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

body.dark-mode {
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
  color: var(--gray-200);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}

h1 {
  font-size: 3.5rem;
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 2.5rem;
  color: var(--gray-900);
}

h3 {
  font-size: 1.875rem;
  color: var(--gray-800);
}

h4 {
  font-size: 1.5rem;
  color: var(--gray-700);
}

p {
  margin-bottom: 1.5rem;
  color: var(--gray-600);
  font-size: 1.125rem;
}

/* ===== ACCESSIBILITY ORB ===== */
.accessibility-orb {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 4.5rem;
  height: 4.5rem;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: var(--z-orb);
  box-shadow: var(--shadow-xl);
  transition: all var(--transition);
  border: 3px solid var(--white);
  animation: float 6s ease-in-out infinite;
}

.accessibility-orb:hover {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--shadow-xl), 0 0 40px rgba(99, 102, 241, 0.3);
  background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
}

.orb-icon {
  font-size: 1.75rem;
  color: var(--white);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.orb-pulse {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  opacity: 0.6;
  animation: pulse 3s infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-15px); }
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.6; }
  70% { transform: scale(1.4); opacity: 0; }
  100% { transform: scale(1.4); opacity: 0; }
}

/* ===== MAIN LAYOUT ===== */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  position: relative;
}

.app-header {
  text-align: center;
  margin-bottom: 4rem;
  padding: 3rem 0;
  position: relative;
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--primary-100) 0%, transparent 70%);
  opacity: 0.5;
  z-index: -1;
}

.tagline {
  font-size: 1.25rem;
  color: var(--gray-500);
  margin-top: 0.5rem;
  font-weight: 500;
}

/* ===== GRID SYSTEM ===== */
.grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 3rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ===== CONTENT CARDS ===== */
.content-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  border: 1px solid var(--gray-200);
  position: relative;
  overflow: hidden;
}

.content-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
}

.content-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-300);
}

.content-card.premium {
  border: 2px solid;
  border-image: linear-gradient(135deg, var(--primary-500), var(--secondary-500)) 1;
}

.card-icon {
  width: 4rem;
  height: 4rem;
  background: linear-gradient(135deg, var(--primary-100), var(--primary-50));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.75rem;
  color: var(--primary-600);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  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, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

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

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary-500), var(--secondary-700));
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--primary-600);
  border: 2px solid var(--primary-300);
}

.btn-outline:hover {
  background: var(--primary-50);
  border-color: var(--primary-500);
}

.btn-icon {
  padding: 0.75rem;
  width: 3rem;
  height: 3rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== LOAD INDICATOR ===== */
.load-indicator {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--white);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: var(--z-fixed);
  backdrop-filter: blur(10px);
  border: 1px solid var(--gray-200);
}

.load-dots {
  display: flex;
  gap: 0.375rem;
}

.load-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--gray-300);
  transition: all var(--transition);
}

.load-dot.active {
  transform: scale(1.2);
}

.load-dot[data-level="low"].active {
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
}

.load-dot[data-level="medium"].active {
  background: var(--warning);
  box-shadow: 0 0 10px var(--warning);
}

.load-dot[data-level="high"].active {
  background: var(--danger);
  box-shadow: 0 0 10px var(--danger);
  animation: pulse 2s infinite;
}

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

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

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

.animate-slide-right {
  animation: slideInRight 0.6s ease-out;
}

.animate-slide-left {
  animation: slideInLeft 0.6s ease-out;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  html { font-size: 14px; }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .main-content {
    padding: 1.5rem;
  }
  
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.5rem; }
  
  .accessibility-orb {
    width: 3.5rem;
    height: 3.5rem;
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== UTILITY CLASSES ===== */
.text-gradient {
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-effect {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== CUSTOM SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
}