/* Import Google Fonts - Poppins & Inter for Premium Typography */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

/* Premium Design System - CSS Variables */
:root {
  /* Brand Colors */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #f59e0b;
  --secondary-dark: #d97706;
  --accent: #ec4899;
  --accent-dark: #db2777;

  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Dark Mode Colors */
  --dark-bg: #0f0f23;
  --dark-surface: #1a1b3e;
  --dark-surface-2: #2d2d5f;
  --dark-border: #343578;
  --dark-text: #e2e8f0;
  --dark-text-muted: #94a3b8;

  /* Success, Warning, Error */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;

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

  /* Typography */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* 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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-backdrop: blur(20px);
}

/* Dark theme variables */
[data-theme="dark"] {
  --white: var(--dark-bg);
  --gray-50: var(--dark-surface);
  --gray-100: var(--dark-surface-2);
  --gray-800: var(--dark-text);
  --gray-900: var(--dark-text);
  --glass-bg: rgba(26, 27, 62, 0.3);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--gray-50);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography Scale */
.text-display {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.text-h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
}

.text-h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 600;
  line-height: 1.3;
}

.text-h3 {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.5vw, 1.875rem);
  font-weight: 600;
  line-height: 1.4;
}

.text-body-lg {
  font-size: 1.125rem;
  line-height: 1.6;
}

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

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

/* Premium Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.btn::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;
}

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

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

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

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: var(--white);
  box-shadow: var(--shadow-lg);
}

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

.btn-glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-backdrop);
  color: var(--white);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.btn-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: 1rem;
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
}

/* Premium Card System */
.card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2xl);
}

.card-glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
}

.card-neumorphism {
  background: var(--gray-100);
  box-shadow: 
    20px 20px 60px rgba(163, 177, 198, 0.6),
    -20px -20px 60px rgba(255, 255, 255, 0.8);
  border: none;
}

.card-neumorphism:hover {
  box-shadow: 
    inset 5px 5px 10px rgba(163, 177, 198, 0.3),
    inset -5px -5px 10px rgba(255, 255, 255, 0.8);
}

/* Gradient Backgrounds */
.bg-gradient-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}

.bg-gradient-secondary {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
}

.bg-gradient-dark {
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-700) 100%);
}

/* Premium Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

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

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

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

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

/* Animation Classes */
.animate-fade-in-up {
  animation: fadeInUp 0.8s ease-out;
}

.animate-fade-in-down {
  animation: fadeInDown 0.8s ease-out;
}

.animate-scale-in {
  animation: scaleIn 0.6s ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft 0.8s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.8s ease-out;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

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

/* Hover Effects */
.hover-scale {
  transition: transform 0.3s ease;
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-lift {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl);
}

.hover-glow {
  position: relative;
  transition: all 0.3s ease;
}

.hover-glow::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: inherit;
  padding: 2px;
  background: linear-gradient(45deg, var(--primary), var(--accent));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: exclude;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.hover-glow:hover::before {
  opacity: 1;
}

/* Loading States */
.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid var(--white);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-dots {
  display: inline-flex;
  gap: 4px;
}

.loading-dots span {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

/* Theme Toggle */
.theme-toggle {
  position: relative;
  width: 50px;
  height: 25px;
  background: var(--gray-300);
  border-radius: 25px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 21px;
  height: 21px;
  background: var(--white);
  border-radius: 50%;
  transition: transform 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.theme-toggle.active {
  background: var(--primary);
}

.theme-toggle.active::before {
  transform: translateX(25px);
}

/* Utility Classes */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.overflow-hidden {
  overflow: hidden;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.text-center {
  text-align: center;
}

/* Responsive Utilities */
@media (max-width: 768px) {
  .card {
    padding: var(--space-lg);
  }
  
  .btn-lg {
    padding: var(--space-md) var(--space-lg);
  }
}

/* Navigation Styles */
.nav-link {
  position: relative;
  padding: 0.5rem 0;
}

.nav-underline {
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transition: width 0.3s ease;
}

.nav-link:hover .nav-underline {
  width: 100%;
}

/* Theme Toggle Enhanced */
.theme-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--gray-200);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--white);
  border-radius: 50%;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

[data-theme="dark"] .theme-toggle {
  background: var(--primary);
}

[data-theme="dark"] .theme-toggle::before {
  transform: translateX(20px);
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
}

/* Mobile Menu Animation */
#mobile-menu {
  transition: all 0.3s ease;
  transform-origin: top;
}

#mobile-menu.hidden {
  transform: scaleY(0);
  opacity: 0;
}

#mobile-menu:not(.hidden) {
  transform: scaleY(1);
  opacity: 1;
}

.hover-shadow:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s ease-in-out;
}

/* Toast notifications positioning */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
}

/* Form validation states */
.form-error {
    border-color: #ef4444 !important;
}

.form-success {
    border-color: #10b981 !important;
}

/* Mobile responsive utilities */
@media (max-width: 768px) {
    .mobile-hidden {
        display: none !important;
    }
    
    .mobile-full {
        width: 100% !important;
    }
    
    .mobile-text-center {
        text-align: center !important;
    }
}