/*
 * ========================================
 * BRANDID SOCIAL MEDIA DOWNLOADER
 * Premium Design System - Million Dollar Quality
 * ========================================
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ========================================
 * ROOT VARIABLES - Premium Color System
 * ======================================== */
:root {
  /* Brand Colors */
  --brand-primary: #667eea;
  --brand-secondary: #764ba2;
  --brand-accent: #f093fb;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  --gradient-warning: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-dark: linear-gradient(135deg, #232526 0%, #414345 100%);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* Shadows - Multi-layer for depth */
  --shadow-sm: 0 2px 4px 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);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --shadow-glow: 0 0 15px rgba(102, 126, 234, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
 * GLOBAL STYLES
 * ======================================== */
* {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: var(--gradient-primary);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-secondary);
}

/* ========================================
 * ANIMATIONS
 * ======================================== */

/* Fade In Up - Page Load */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In - Simple */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Scale In */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Slide In Right */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Slide In Left */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Floating */
@keyframes floating {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* Pulse Glow */
@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.5);
  }
  50% {
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.8);
  }
}

/* Gradient Animation */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

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

/* ========================================
 * UTILITY CLASSES
 * ======================================== */

/* Animation Classes */
.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease-out forwards;
}

.animate-scaleIn {
  animation: scaleIn 0.4s ease-out forwards;
}

.animate-slideInRight {
  animation: slideInRight 0.5s ease-out forwards;
}

.animate-slideInLeft {
  animation: slideInLeft 0.5s ease-out forwards;
}

.animate-floating {
  animation: floating 3s ease-in-out infinite;
}

/* Delay Classes */
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }

/* Initial Hidden State */
.animate-fadeInUp,
.animate-fadeIn,
.animate-scaleIn,
.animate-slideInRight,
.animate-slideInLeft {
  opacity: 0;
}

/* ========================================
 * GLASSMORPHISM COMPONENTS
 * ======================================== */
.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: var(--glass-shadow);
}

.glass-white {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.glass-dark {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========================================
 * PREMIUM BUTTONS
 * ======================================== */
.btn-premium {
  position: relative;
  overflow: hidden;
  background: var(--gradient-primary);
  color: white;
  font-weight: 600;
  padding: 1rem 2rem;
  border-radius: 0.75rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

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

.btn-premium:active {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

.btn-premium::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s;
}

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

/* ========================================
 * PREMIUM INPUTS
 * ======================================== */
.input-premium {
  width: 100%;
  padding: 1rem;
  border: 2px solid #e2e8f0;
  border-radius: 0.75rem;
  font-size: 1rem;
  transition: all var(--transition-base);
  background: white;
}

.input-premium:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  transform: translateY(-2px);
}

.input-premium:hover {
  border-color: var(--brand-primary);
}

/* ========================================
 * PREMIUM CARDS
 * ======================================== */
.card-premium {
  background: white;
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  border: 1px solid rgba(0,0,0,0.05);
}

.card-premium:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-2xl);
}

.card-premium-glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 1.5rem;
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: var(--glass-shadow);
  transition: all var(--transition-base);
}

.card-premium-glass:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.5);
}

/* ========================================
 * SKELETON LOADERS
 * ======================================== */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 0.5rem;
}

.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
}

.skeleton-title {
  height: 2rem;
  width: 60%;
  margin-bottom: 1rem;
}

.skeleton-card {
  height: 200px;
  border-radius: 1rem;
}

/* ========================================
 * GRADIENT TEXT
 * ======================================== */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

/* ========================================
 * ANIMATED GRADIENTS
 * ======================================== */
.gradient-animated {
  background: linear-gradient(270deg, #667eea, #764ba2, #f093fb, #667eea);
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite;
}

/* ========================================
 * PREMIUM BADGES
 * ======================================== */
.badge-premium {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

/* ========================================
 * TOOLTIP
 * ======================================== */
.tooltip {
  position: relative;
  cursor: help;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-5px);
  padding: 0.5rem 1rem;
  background: rgba(0, 0, 0, 0.9);
  color: white;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
}

.tooltip:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(-10px);
}

/* ========================================
 * RESPONSIVE
 * ======================================== */
@media (max-width: 768px) {
  .card-premium,
  .card-premium-glass {
    padding: 1.5rem;
  }
  
  .btn-premium {
    padding: 0.875rem 1.5rem;
  }
}