/* ===============================================
   BIZINFOSOFT MOBILE STORE - DESIGN SYSTEM
   =============================================== */

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

/* ===============================================
   CSS VARIABLES & DESIGN TOKENS
   =============================================== */
:root {
  /* Colors */
  --color-dark-blue: #021B3A;
  --color-electric-blue: #0A65FF;
  --color-light-grey: #F3F4F6;
  --color-white: #FFFFFF;
  --color-blue-hover: #0851CC;
  --color-gradient-start: #0A65FF;
  --color-gradient-end: #00D4FF;
  --color-text-dark: #1F2937;
  --color-text-light: #6B7280;
  --color-border: #E5E7EB;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  
  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-alt: 'Poppins', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-blue: 0 10px 30px rgba(10, 101, 255, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Layout */
  --container-max-width: 1280px;
  --header-height: 80px;
}

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

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

body {
  font-family: var(--font-body);
  color: var(--color-text-dark);
  background-color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ===============================================
   UTILITIES
   =============================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-dark-blue);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl) auto;
}

/* ===============================================
   HEADER & NAVIGATION
   =============================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-dark-blue);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

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

.nav-link {
  font-weight: 500;
  color: var(--color-text-dark);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-electric-blue);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-electric-blue);
}

.nav-link:hover::before {
  width: 80%;
}

.nav-link.active {
  color: var(--color-electric-blue);
  background: rgba(10, 101, 255, 0.1);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

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

/* ===============================================
   BUTTONS
   =============================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  font-family: var(--font-alt);
  font-size: 1rem;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  color: var(--color-white);
  box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(10, 101, 255, 0.4);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-electric-blue);
  border-color: var(--color-electric-blue);
}

.btn-secondary:hover {
  background: var(--color-electric-blue);
  color: var(--color-white);
}

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

.btn-outline:hover {
  background: var(--color-light-grey);
  border-color: var(--color-electric-blue);
  color: var(--color-electric-blue);
}

/* ===============================================
   HERO SECTION
   =============================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #021B3A 0%, #0A3A7A 100%);
  position: relative;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(10, 101, 255, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0, 212, 255, 0.2) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.hero-text h1 .highlight {
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.hero-image {
  position: relative;
  animation: float 3s ease-in-out infinite;
}

.hero-image img {
  filter: drop-shadow(0 25px 50px rgba(0, 0, 0, 0.5));
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* ===============================================
   BRAND LOGOS SECTION
   =============================================== */
.brands-section {
  background: var(--color-white);
  padding: var(--spacing-xl) 0;
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.brand-card {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  cursor: pointer;
  height: 120px;
}

.brand-card:hover {
  border-color: var(--color-electric-blue);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.brand-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-dark);
}

/* ===============================================
   PRODUCT CARDS
   =============================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  border: 1px solid var(--color-border);
}

.product-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-electric-blue);
}

.product-badge {
  position: absolute;
  top: 15px;
  right: 15px;
  background: var(--color-electric-blue);
  color: var(--color-white);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 2;
}

.product-badge.new {
  background: var(--color-success);
}

.product-badge.hot {
  background: var(--color-warning);
}

.product-image {
  width: 100%;
  height: 300px;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-image img {
  max-height: 90%;
  object-fit: contain;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
  transform: scale(1.1);
}

.product-info {
  padding: var(--spacing-md);
}

.product-name {
  font-family: var(--font-alt);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-dark-blue);
  margin-bottom: 0.5rem;
}

.product-specs {
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.product-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-electric-blue);
  font-family: var(--font-heading);
  margin-bottom: var(--spacing-sm);
}

.product-actions {
  display: flex;
  gap: 0.5rem;
}

.product-actions .btn {
  flex: 1;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
}

/* ===============================================
   CATEGORY SECTIONS
   =============================================== */
.category-section {
  background: var(--color-light-grey);
}

.category-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.category-tab {
  padding: 0.875rem 2rem;
  background: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-weight: 600;
  color: var(--color-text-dark);
  cursor: pointer;
  transition: all var(--transition-base);
}

.category-tab:hover,
.category-tab.active {
  background: var(--color-electric-blue);
  color: var(--color-white);
  border-color: var(--color-electric-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
}

/* ===============================================
   WHY CHOOSE US
   =============================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  background: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.feature-card:hover {
  border-color: var(--color-electric-blue);
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md) auto;
  font-size: 2rem;
  color: var(--color-white);
}

.feature-title {
  font-family: var(--font-alt);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-dark-blue);
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===============================================
   FOOTER
   =============================================== */
.footer {
  background: var(--color-dark-blue);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-2xl) 0 var(--spacing-md) 0;
}

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

.footer-section h3 {
  font-family: var(--font-heading);
  color: var(--color-white);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-electric-blue);
  padding-left: 5px;
}

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

.social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-base);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}

/* ===============================================
   CONTACT FORM
   =============================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.contact-form {
  background: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

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

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

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all var(--transition-base);
  background: var(--color-white);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 0 3px rgba(10, 101, 255, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.info-card {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  display: flex;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
}

.info-card:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-lg);
}

.info-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.info-text h4 {
  font-family: var(--font-alt);
  color: var(--color-dark-blue);
  margin-bottom: 0.25rem;
}

.info-text p {
  color: var(--color-text-light);
}

.map-container {
  width: 100%;
  height: 400px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-top: var(--spacing-xl);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */
@media (max-width: 968px) {
  .hero-content,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-text h1 {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-base);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
  }
  
  .mobile-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }
  
  .products-grid {
    grid-template-columns: 1fr;
  }
  
  .brands-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}

@media (max-width: 480px) {
  :root {
    --header-height: 70px;
  }
  
  .hero-text h1 {
    font-size: 2rem;
  }
  
  .hero-text p {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
  }
}

/* ===============================================
   ANIMATIONS & MICRO-INTERACTIONS
   =============================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* Smooth scroll offset for fixed header */
html {
  scroll-padding-top: calc(var(--header-height) + 20px);
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--color-white);
  animation: spin 0.8s linear infinite;
}

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