/* ========================================
   GLOBAL STYLES & DESIGN SYSTEM
   Modern E-commerce Electronics Store
   ======================================== */

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

/* ========================================
   CSS VARIABLES - DESIGN TOKENS
   ======================================== */
:root {
  /* Colors - Primary Palette (Deep Blue Theme) */
  --primary-color: #0a2463;
  --primary-dark: #071a4a;
  --primary-light: #1e3a8a;
  --primary-lighter: #dbeafe;

  /* Colors - Secondary */
  --secondary-color: #1e40af;
  --secondary-dark: #1e3a8a;
  --secondary-light: #3b82f6;

  /* Colors - Accent */
  --accent-color: #0ea5e9;
  --accent-dark: #0284c7;
  --accent-light: #38bdf8;

  /* Colors - Neutrals */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* Semantic Colors */
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;

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

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

  /* 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);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

h5 {
  font-size: 1.125rem;
  font-weight: 600;
}

h6 {
  font-size: 1rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--gray-600);
}

.text-small {
  font-size: 0.875rem;
}

.text-large {
  font-size: 1.125rem;
}

/* ========================================
   CONTAINER & LAYOUT
   ======================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-small {
  padding: var(--spacing-2xl) 0;
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */
.header {
  background-color: var(--white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) 0;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: transform var(--transition-base);
}

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

.logo-image {
  width: 45px;
  height: 45px;
  object-fit: contain;
  transition: transform var(--transition-slow);
  animation: logoFloat 3s ease-in-out infinite;
}

.logo:hover .logo-image {
  transform: rotate(360deg);
}

@keyframes logoFloat {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-5px);
  }
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--gray-700);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color);
  background-color: var(--primary-lighter);
}

.nav-link.active {
  color: var(--primary-color);
  font-weight: 600;
}

.cart-icon {
  position: relative;
  padding: var(--spacing-sm);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.cart-icon:hover {
  transform: scale(1.1);
}

.cart-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  background-color: var(--error);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.125rem 0.375rem;
  border-radius: 999px;
  min-width: 20px;
  text-align: center;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--gray-800);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ========================================
   HERO SECTION - ENHANCED
   ======================================== */
.hero {
  background: linear-gradient(135deg, #0a2463 0%, #1e3a8a 50%, #0ea5e9 100%);
  color: var(--white);
  padding: 5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  animation: backgroundPulse 15s ease-in-out infinite;
}

@keyframes backgroundPulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.8;
  }
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background: linear-gradient(to top, var(--gray-50), transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: var(--white);
  font-size: 3.5rem;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  font-weight: 900;
  line-height: 1.1;
}

.hero p {
  font-size: 1.375rem;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  font-weight: 500;
}


/* ========================================
   BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  text-align: center;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--white);
}

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

.btn-accent:hover {
  background-color: var(--accent-dark);
  transform: translateY(-2px);
}

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

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ========================================
   PRODUCT CARDS - UNIQUE GLASSMORPHISM DESIGN
   ======================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.product-card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
  border: 2px solid rgba(255, 255, 255, 0.18);
  position: relative;
  /* Performance optimization */
  transform: translateZ(0);
  will-change: transform;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* Backdrop blur only on desktop for performance */
@media (min-width: 1024px) {
  .product-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
  }

  .product-info {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(5px);
  }
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  background-size: 200% 200%;
}

/* Animate gradient only on desktop */
@media (min-width: 1024px) {
  .product-card::before {
    animation: gradientShift 3s ease infinite;
  }
}

.product-card:hover {
  box-shadow: 0 15px 50px 0 rgba(31, 38, 135, 0.25);
  transform: translateY(-8px) translateZ(0);
  border-color: var(--primary-light);
}

.product-image {
  width: 100%;
  height: 280px;
  object-fit: contain;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: var(--spacing-xl);
  transition: transform var(--transition-base);
  position: relative;
  transform: translateZ(0);
}

.product-card:hover .product-image {
  transform: scale(1.05) translateZ(0);
}

/* More complex hover effects only on desktop */
@media (min-width: 1024px) {
  .product-card:hover .product-image {
    transform: scale(1.1) rotate(2deg) translateZ(0);
  }
}

.product-info {
  padding: var(--spacing-xl);
  flex: 1;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.95);
}

.product-brand {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-xs);
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: linear-gradient(135deg, var(--primary-lighter), rgba(37, 99, 235, 0.1));
  border-radius: 999px;
  width: fit-content;
}

.product-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
  min-height: 2.6em;
}

.product-price {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
  font-family: var(--font-heading);
  display: flex;
  align-items: baseline;
  gap: var(--spacing-sm);
}

.product-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: auto;
}

.product-actions .btn {
  flex: 1;
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  font-weight: 700;
  border-radius: var(--radius-lg);
}

.product-actions .btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.product-actions .btn-outline {
  background: rgba(255, 255, 255, 0.95);
}

/* Backdrop filter only on desktop */
@media (min-width: 1024px) {
  .product-actions .btn-outline {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
  }
}

/* Popular Badge */
.product-card.popular::after {
  content: '🔥 Popular';
  position: absolute;
  top: 20px;
  right: 20px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
  z-index: 10;
}



/* ========================================
   CATEGORY SECTION
   ======================================== */
.category-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.category-title {
  font-size: 2.5rem;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.category-description {
  font-size: 1.125rem;
  color: var(--gray-600);
  max-width: 700px;
  margin: 0 auto;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
  background-color: var(--gray-900);
  color: var(--gray-300);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-section p,
.footer-section a {
  color: var(--gray-400);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.footer-section a:hover {
  color: var(--primary-light);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  background-color: var(--gray-800);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-link:hover {
  background-color: var(--primary-color);
  transform: translateY(-3px);
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: var(--spacing-md);
  text-align: center;
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mt-2xl {
  margin-top: var(--spacing-2xl);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.mb-2xl {
  margin-bottom: var(--spacing-2xl);
}

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

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

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

.text-primary {
  color: var(--primary-color);
}

.text-secondary {
  color: var(--secondary-color);
}

.text-accent {
  color: var(--accent-color);
}

.bg-white {
  background-color: var(--white);
}

.bg-gray {
  background-color: var(--gray-50);
}

.flex {
  display: flex;
}

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

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

.hidden {
  display: none;
}

/* ========================================
   ANIMATIONS
   ======================================== */

/* Loading Animation */
@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Fade In Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

/* Slide Up Animation */
@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Gradient Animation for Headers */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

.animated-gradient {
  background: linear-gradient(270deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  background-size: 600% 600%;
  animation: gradientShift 8s ease infinite;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Shimmer Effect */
@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }

  100% {
    background-position: 1000px 0;
  }
}

.shimmer {
  background: linear-gradient(to right,
      transparent 0%,
      rgba(255, 255, 255, 0.3) 50%,
      transparent 100%);
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
}

/* Bounce Animation */
@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }

  40% {
    transform: translateY(-10px);
  }

  60% {
    transform: translateY(-5px);
  }
}

.bounce {
  animation: bounce 2s infinite;
}

/* Scale Pulse */
@keyframes scalePulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

/* Glow Effect */
@keyframes glow {

  0%,
  100% {
    box-shadow: 0 0 5px var(--primary-color),
      0 0 10px var(--primary-color),
      0 0 15px var(--primary-color);
  }

  50% {
    box-shadow: 0 0 10px var(--primary-color),
      0 0 20px var(--primary-color),
      0 0 30px var(--primary-color);
  }
}

.glow {
  animation: glow 2s ease-in-out infinite;
}

/* Stagger Animation Delays */
.stagger-1 {
  animation-delay: 0.1s;
}

.stagger-2 {
  animation-delay: 0.2s;
}

.stagger-3 {
  animation-delay: 0.3s;
}

.stagger-4 {
  animation-delay: 0.4s;
}

.stagger-5 {
  animation-delay: 0.5s;
}

.stagger-6 {
  animation-delay: 0.6s;
}

/* Product Card Entrance Animation */
.product-card {
  animation: slideUp 0.6s ease-out forwards;
  opacity: 0;
}

.product-card:nth-child(1) {
  animation-delay: 0.1s;
}

.product-card:nth-child(2) {
  animation-delay: 0.2s;
}

.product-card:nth-child(3) {
  animation-delay: 0.3s;
}

.product-card:nth-child(4) {
  animation-delay: 0.4s;
}

.product-card:nth-child(5) {
  animation-delay: 0.5s;
}

.product-card:nth-child(6) {
  animation-delay: 0.6s;
}

.product-card:nth-child(7) {
  animation-delay: 0.7s;
}

.product-card:nth-child(8) {
  animation-delay: 0.8s;
}

/* Button Ripple Effect */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

/* Hero Title Animation */
.hero h1 {
  animation: fadeIn 0.8s ease-out;
}

.hero p {
  animation: fadeIn 1s ease-out 0.2s backwards;
}

/* Navigation Link Underline Animation */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

/* Category Title Animation */
.category-title {
  animation: fadeIn 0.8s ease-out;
}

.category-description {
  animation: fadeIn 1s ease-out 0.2s backwards;
}