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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #8b5cf6;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --dark: #1f2937;
  --dark-light: #374151;
  --gray: #6b7280;
  --gray-light: #e5e7eb;
  --white: #ffffff;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --radius: 12px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========== HEADER ========== */
header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
  padding: 1.2rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cart-icon {
  position: relative;
  font-size: 2rem;
  cursor: pointer;
  transition: var(--transition);
  padding: 0.8rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.cart-icon:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

.cart-icon:active {
  transform: translateY(-1px) scale(0.98);
}

.cart-icon span:first-child {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.cart-count {
  position: absolute;
  top: -6px;
  right: -6px;
  background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
  color: var(--white);
  border-radius: 50%;
  min-width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
  border: 2px solid var(--white);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* ========== CONTAINER ========== */
.container {
  max-width: 1400px;
  margin: 2.5rem auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.8fr 1fr;
  gap: 2rem;
  animation: fadeIn 0.6s ease-out;
}

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

/* ========== SECTIONS ========== */
.products-section,
.cart-section {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: var(--transition);
}

.products-section:hover,
.cart-section:hover {
  box-shadow: 0 30px 60px -15px rgb(0 0 0 / 0.3);
}

h2 {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.8rem;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  position: relative;
  padding-bottom: 0.8rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 2px;
}

/* ========== PRODUCTS GRID ========== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--white);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  opacity: 0;
  transition: var(--transition);
  z-index: 0;
}

.product-card:hover::before {
  opacity: 0.05;
}

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

.product-card > * {
  position: relative;
  z-index: 1;
}

.product-icon {
  font-size: 5rem;
  margin-bottom: 1.2rem;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
  transition: var(--transition);
}

.product-card:hover .product-icon {
  transform: scale(1.15) rotate(5deg);
}

.product-card h3 {
  color: var(--dark);
  margin-bottom: 0.8rem;
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.2px;
}

.product-price {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 2rem;
  font-weight: 800;
  margin: 1rem 0;
  letter-spacing: -0.5px;
}

.product-stock {
  color: var(--gray);
  font-size: 0.9rem;
  margin-bottom: 1.2rem;
  font-weight: 500;
  padding: 0.3rem 0.8rem;
  background: var(--gray-light);
  border-radius: 20px;
  display: inline-block;
}

/* ========== BUTTONS ========== */
.btn-add {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: var(--white);
  border: none;
  padding: 1rem 2rem;
  border-radius: 50px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  width: 100%;
  box-shadow: var(--shadow-md);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}

.btn-add::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

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

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

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

.btn-add:disabled {
  background: linear-gradient(135deg, var(--gray) 0%, var(--dark-light) 100%);
  cursor: not-allowed;
  transform: none;
  opacity: 0.6;
}

/* ========== CART ========== */
.cart-container {
  min-height: 250px;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.cart-container::-webkit-scrollbar {
  width: 8px;
}

.cart-container::-webkit-scrollbar-track {
  background: var(--gray-light);
  border-radius: 10px;
}

.cart-container::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 10px;
}

.cart-container::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

.empty-cart {
  text-align: center;
  color: var(--gray);
  padding: 3rem 2rem;
  font-style: italic;
  font-size: 1.1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.empty-cart::before {
  content: '🛒';
  font-size: 4rem;
  opacity: 0.3;
}

.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem;
  margin-bottom: 0.8rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
  border: 1px solid rgba(99, 102, 241, 0.1);
  transition: var(--transition);
  animation: slideInRight 0.4s ease-out;
}

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

.cart-item:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

.cart-item-info {
  flex: 1;
}

.cart-item-name {
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
}

.cart-item-price {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 1.1rem;
  font-weight: 700;
}

.btn-remove {
  background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
  color: var(--white);
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
}

.btn-remove:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

.btn-remove:active {
  transform: translateY(0) scale(0.98);
}

/* ========== CART TOTAL ========== */
.cart-total {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--gray-light);
}

.cart-total h3 {
  color: var(--dark);
  font-size: 1.8rem;
  margin-bottom: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cart-total h3 span {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 2rem;
}

.btn-clear,
.btn-checkout {
  width: 100%;
  padding: 1rem 2rem;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 0.8rem;
  letter-spacing: 0.3px;
  box-shadow: var(--shadow-md);
}

.btn-clear {
  background: linear-gradient(135deg, var(--gray-light) 0%, #d1d5db 100%);
  color: var(--dark);
}

.btn-clear:hover:not(:disabled) {
  background: linear-gradient(135deg, #d1d5db 0%, #9ca3af 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-checkout {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  color: var(--white);
}

.btn-checkout:hover:not(:disabled) {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-checkout:disabled,
.btn-clear:disabled {
  background: linear-gradient(135deg, var(--gray) 0%, var(--dark-light) 100%);
  cursor: not-allowed;
  transform: none;
  opacity: 0.5;
}

/* ========== MODAL ========== */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: fadeIn 0.3s ease-out;
}

.modal-content {
  background: var(--white);
  margin: 10% auto;
  padding: 3rem;
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  text-align: center;
  animation: slideUp 0.4s ease-out;
  box-shadow: var(--shadow-xl);
}

@keyframes slideUp {
  from {
    transform: translateY(100px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-content h2 {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
  font-size: 2rem;
}

.modal-content p {
  color: var(--gray);
  margin-bottom: 2rem;
  font-size: 1.2rem;
  line-height: 1.6;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: var(--white);
  border: none;
  padding: 1rem 3rem;
  border-radius: 50px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

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

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

/* ========== FOOTER ========== */
footer {
  text-align: center;
  padding: 2.5rem 2rem;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.95rem;
  font-weight: 500;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .container {
    grid-template-columns: 1fr;
    max-width: 800px;
  }

  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .header-container {
    padding: 0 1.5rem;
  }

  .container {
    padding: 0 1.5rem;
    margin: 2rem auto;
  }

  .products-section,
  .cart-section {
    padding: 1.5rem;
  }

  .cart-total h3 {
    font-size: 1.5rem;
  }

  .cart-total h3 span {
    font-size: 1.6rem;
  }

  .modal-content {
    margin: 20% auto;
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.3rem;
  }

  .cart-icon {
    font-size: 1.5rem;
    padding: 0.6rem;
  }

  .product-icon {
    font-size: 4rem;
  }

  .product-price {
    font-size: 1.6rem;
  }

  .btn-add,
  .btn-checkout,
  .btn-clear {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
  }
}