* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #10b981;
  --danger: #ef4444;
  --dark: #1f2937;
  --gray: #6b7280;
  --light-gray: #f3f4f6;
  --white: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--dark);
  line-height: 1.6;
}

/* Header */
header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

header .container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.8rem;
  font-weight: 800;
}

nav {
  display: flex;
  gap: 8px;
}

nav a {
  color: var(--dark);
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width 0.3s;
}

nav a:hover::after {
  width: 80%;
}

nav a:hover {
  color: var(--primary);
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* Main Content */
main {
  background: var(--white);
  border-radius: 20px;
  padding: 40px;
  margin: 30px auto;
  box-shadow: var(--shadow-lg);
}

main h2 {
  font-size: 2.5rem;
  margin-bottom: 30px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

/* Buttons */
button,
.btn-primary,
.btn-secondary {
  padding: 12px 30px;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: var(--shadow);
}

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

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

.btn-secondary {
  background: var(--light-gray);
  color: var(--dark);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 80px 20px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.1));
  border-radius: 20px;
  margin: 20px 0 40px 0;
}

.hero h2 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.3rem;
  color: var(--gray);
  margin-bottom: 30px;
}

/* Footer */
footer {
  background: var(--white);
  padding: 30px 20px;
  text-align: center;
  margin-top: 50px;
  box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
}

footer p {
  color: var(--gray);
}

/* Loading */
.loading-spinner {
  border: 4px solid var(--light-gray);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Notification */
.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 15px 25px;
  border-radius: 10px;
  color: var(--white);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s;
  z-index: 2000;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.notification-success {
  background: var(--secondary);
}

.notification-error {
  background: var(--danger);
}

/* Responsive */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    gap: 15px;
  }
  
  nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero h2 {
    font-size: 2.5rem;
  }
  
  main {
    padding: 20px;
  }
}

.cart-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: linear-gradient(135deg, var(--danger), #dc2626);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.4);
}