/* css/style.css - Premium Modern Design System */
:root {
  /* HSL Tailored Colors */
  --bg-color: hsl(220, 20%, 97%);
  --surface-color: hsl(0, 0%, 100%);
  --text-primary: hsl(222, 47%, 11%);
  --text-secondary: hsl(215, 16%, 47%);
  --accent-primary: hsl(252, 87%, 67%);
  --accent-hover: hsl(252, 87%, 73%);
  --success: hsl(152, 69%, 31%);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Radii */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography Utilities */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; margin-bottom: 1rem; }
h2 { font-size: 2rem; margin-bottom: 0.75rem; }
p { color: var(--text-secondary); margin-bottom: 1rem; }

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 0;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  background: linear-gradient(135deg, var(--accent-primary), hsl(280, 80%, 60%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

main {
  flex: 1;
  padding: 4rem 0;
}

/* Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.25, 1, 0.5, 1);
  font-family: inherit;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: white;
  box-shadow: 0 4px 14px 0 rgba(144, 97, 249, 0.39);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(144, 97, 249, 0.23);
}

.btn-block {
  width: 100%;
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.product-card {
  background: var(--surface-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--glass-shadow);
  border: 1px solid rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

.product-image {
  width: 100%;
  aspect-ratio: 4/3;
  border-radius: var(--radius-sm);
  background-color: var(--bg-color);
  object-fit: cover;
  margin-bottom: 1.5rem;
}

.product-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.product-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.product-footer {
  margin-top: auto;
}

/* Modal / Checkout Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background: var(--surface-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 90%;
  max-width: 480px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  transform: translateY(20px);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

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

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: var(--bg-color);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(144, 97, 249, 0.2);
  background: var(--surface-color);
}

/* QR Code Display */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-color);
  border-radius: var(--radius-md);
  text-align: center;
}

.qr-placeholder {
  width: 200px;
  height: 200px;
  background: white;
  padding: 10px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  margin-bottom: 1rem;
}

.qr-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hidden {
  display: none !important;
}

/* Spinner */
.loader {
  border: 3px solid rgba(0,0,0,0.1);
  border-top: 3px solid var(--accent-primary);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  display: inline-block;
}

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