/* 3D Gadgets Lab - Main Styles */
:root {
  --bg-color: #0b0f1d;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-bg-hover: rgba(255, 255, 255, 0.1);
  --primary-color: #4e8df5;
  --accent-color: #f35e91;
  --success-color: #4ade80;
  --warning-color: #fbbf24;
  --error-color: #f87171;
  --text-color: #e6e8ec;
  --muted-color: #a3a6ad;
  --border-color: rgba(255, 255, 255, 0.1);
  --transition-speed: 0.3s;
}

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

body {
  font-family: 'Inter', sans-serif;
  color: var(--text-color);
  background: var(--bg-color);
  min-height: 100vh;
  line-height: 1.6;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-speed);
}

a:hover {
  color: var(--accent-color);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.header {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo i {
  color: var(--primary-color);
}

.nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav a {
  color: var(--muted-color);
  font-weight: 500;
  transition: color var(--transition-speed);
}

.nav a:hover,
.nav a.active {
  color: var(--text-color);
}

.cart-icon {
  position: relative;
  font-size: 1.25rem;
}

.cart-count {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--accent-color);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cart-count:empty,
.cart-count[data-count="0"] {
  display: none;
}

/* Language Switcher */
.lang-switcher-wrapper {
  margin-left: 0.5rem;
}

.lang-switcher {
  background: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.lang-switcher:hover {
  border-color: var(--primary-color);
  background: var(--card-bg-hover);
}

.lang-switcher:focus {
  outline: none;
  border-color: var(--primary-color);
}

.lang-switcher option {
  background: var(--bg-color);
  color: var(--text-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-speed);
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(78, 141, 245, 0.4);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--card-bg-hover);
}

.btn-success {
  background: var(--success-color);
  color: #0b0f1d;
}

.btn-danger {
  background: var(--error-color);
  color: white;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Product Grid */
.page-title {
  text-align: center;
  padding: 2rem 1rem;
}

.page-title h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.page-title p {
  color: var(--muted-color);
}

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

.product-card {
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all var(--transition-speed);
}

.product-card:hover {
  transform: translateY(-4px);
  background: var(--card-bg-hover);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.product-image-container {
  position: relative;
}

.product-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--bg-color);
}

.product-thumbnails {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--bg-color);
  overflow-x: auto;
}

.product-thumbnail {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  padding: 0;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-speed);
  background: none;
}

.product-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-thumbnail:hover {
  border-color: var(--primary-color);
}

.product-thumbnail.active {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(78, 141, 245, 0.3);
}

.product-info {
  padding: 1rem;
}

.product-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.product-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.product-variants {
  margin-bottom: 1rem;
}

.variant-group {
  margin-bottom: 0.75rem;
}

.variant-label {
  font-size: 0.8rem;
  color: var(--muted-color);
  margin-bottom: 0.25rem;
}

.variant-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.variant-option {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-speed);
  background: transparent;
  color: var(--text-color);
}

.variant-option:hover {
  border-color: var(--primary-color);
}

.variant-option.selected {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.color-option {
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 50%;
  border-width: 2px;
}

.color-option.selected {
  box-shadow: 0 0 0 2px var(--bg-color), 0 0 0 4px var(--primary-color);
}

/* Cart Page */
.cart-container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.cart-empty {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--card-bg);
  border-radius: 12px;
}

.cart-empty i {
  font-size: 4rem;
  color: var(--muted-color);
  margin-bottom: 1rem;
}

.cart-items {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cart-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.cart-item-image {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 8px;
}

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

.cart-item-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.cart-item-variants {
  font-size: 0.85rem;
  color: var(--muted-color);
  margin-bottom: 0.5rem;
}

.cart-item-price {
  font-weight: 600;
  color: var(--primary-color);
}

.cart-item-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}

.quantity-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.quantity-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.quantity-btn:hover {
  background: var(--card-bg-hover);
  border-color: var(--primary-color);
}

.quantity-value {
  width: 40px;
  text-align: center;
  font-weight: 600;
}

.remove-item {
  color: var(--error-color);
  cursor: pointer;
  font-size: 0.85rem;
}

.remove-item:hover {
  text-decoration: underline;
}

.cart-summary {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.cart-total {
  display: flex;
  justify-content: space-between;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cart-total-price {
  color: var(--primary-color);
}

/* Checkout Page */
.checkout-container {
  max-width: 600px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.checkout-form {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 2rem;
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-color);
}

.form-group label .required {
  color: var(--error-color);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-color);
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-control::placeholder {
  color: var(--muted-color);
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.order-summary {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

.order-summary h3 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.order-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-size: 0.9rem;
}

.order-item-name {
  color: var(--muted-color);
}

.order-total {
  display: flex;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-weight: 700;
  font-size: 1.1rem;
}

/* Success Page */
.success-container {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 500px;
  margin: 2rem auto;
}

.success-icon {
  font-size: 5rem;
  color: var(--success-color);
  margin-bottom: 1.5rem;
}

.success-container h1 {
  margin-bottom: 1rem;
}

.success-container p {
  color: var(--muted-color);
  margin-bottom: 2rem;
}

.order-number {
  font-size: 1.25rem;
  color: var(--primary-color);
  font-weight: 600;
}

/* Loading & Messages */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.alert {
  padding: 1rem 1.5rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.alert-success {
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid var(--success-color);
  color: var(--success-color);
}

.alert-error {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid var(--error-color);
  color: var(--error-color);
}

.alert-warning {
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid var(--warning-color);
  color: var(--warning-color);
}

/* Footer */
.footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 2rem 1rem;
  text-align: center;
  margin-top: auto;
}

.footer p {
  color: var(--muted-color);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .cart-item {
    flex-direction: column;
  }

  .cart-item-image {
    width: 100%;
    height: 200px;
  }

  .cart-item-actions {
    flex-direction: row;
    justify-content: space-between;
    width: 100%;
  }
}