/* 
 * Vicor Distributor Website - Main Stylesheet
 * Follows BEM methodology and responsive design principles
 * Optimized for performance and accessibility
 */

/* CSS Custom Properties for consistent theming */
:root {
  /* Color Palette */
  --primary-blue: #1E3A8A;
  --secondary-blue: #3B82F6;
  --accent-orange: #F59E0B;
  --neutral-gray: #6B7280;
  --dark-gray: #1F2937;
  --light-gray: #F3F4F6;
  --white: #FFFFFF;
  --black: #000000;
  
  /* Spacing System - Base unit: 8px */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  --spacing-xxxl: 80px;
  --spacing-xxxxl: 96px;
  
  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-secondary: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'Consolas', 'Monaco', 'Lucida Console', monospace;
  
  /* Typography Scales */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 30px;
  --text-4xl: 36px;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* 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);
  
  /* Breakpoints */
  --breakpoint-sm: 320px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 100%; /* 16px base */
  line-height: var(--line-height-normal);
}

body {
  font-family: var(--font-primary);
  color: var(--dark-gray);
  background-color: var(--white);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  line-height: var(--line-height-tight);
  font-weight: 600;
  color: var(--dark-gray);
}

h1 {
  font-size: var(--text-4xl);
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--text-2xl);
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-sm);
}

h5 {
  font-size: var(--text-lg);
  margin-bottom: var(--spacing-xs);
}

h6 {
  font-size: var(--text-base);
  margin-bottom: var(--spacing-xs);
}

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

a {
  color: var(--secondary-blue);
  text-decoration: none;
}

a:hover, a:focus {
  text-decoration: underline;
  color: var(--primary-blue);
}

a:focus {
  outline: 2px solid var(--secondary-blue);
  outline-offset: 2px;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Layout */
.grid {
  display: grid;
}

/* Header Styles */
.header {
  background-color: var(--white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--light-gray);
}

.logo h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--primary-blue);
}

/* Navigation */
.main-nav {
  display: none; /* Mobile first - will be shown on larger screens */
}

.nav-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--dark-gray);
  font-weight: 500;
  transition: color 0.2s ease;
  text-decoration: none;
}

.nav-link:hover, .nav-link:focus {
  color: var(--primary-blue);
  background-color: var(--light-gray);
  text-decoration: none;
}

.dropdown-menu {
  list-style: none;
  position: static; /* Will be positioned absolutely in mobile view */
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  margin-top: var(--spacing-xs);
  display: none;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  display: block;
}

.dropdown-link {
  display: block;
  padding: var(--spacing-sm);
  color: var(--dark-gray);
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.dropdown-link:hover {
  background-color: var(--light-gray);
  color: var(--primary-blue);
  text-decoration: none;
}

.cta-button {
  background-color: var(--accent-orange);
  color: var(--white) !important;
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 600;
  text-align: center;
  display: inline-block;
}

.cta-button:hover {
  background-color: #d97706;
  color: var(--white) !important;
  text-decoration: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 101;
}

.hamburger {
  width: 100%;
  height: 3px;
  background: var(--primary-blue);
  border-radius: 10px;
  transition: all 0.3s linear;
  position: relative;
  transform-origin: center;
}

/* Floating Contact Bar */
.floating-contact {
  background-color: var(--primary-blue);
  color: var(--white);
  display: flex;
  justify-content: flex-end;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--text-sm);
}

.contact-item {
  margin-left: var(--spacing-lg);
  display: flex;
  align-items: center;
}

.contact-icon {
  margin-right: var(--spacing-xs);
}

/* Breadcrumb */
.breadcrumb {
  background-color: var(--light-gray);
  padding: var(--spacing-sm) 0;
  font-size: var(--text-sm);
}

.breadcrumb a {
  color: var(--secondary-blue);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  margin: 0 var(--spacing-xs);
  color: var(--neutral-gray);
}

/* Main Content */
.main-content {
  padding: var(--spacing-lg) 0;
  min-height: calc(100vh - 300px); /* Adjust based on header/footer height */
}

/* Footer */
.footer {
  background-color: var(--dark-gray);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xxxxl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
  color: var(--accent-orange);
  margin-bottom: var(--spacing-sm);
  font-size: var(--text-lg);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: var(--white);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-section a:hover {
  color: var(--accent-orange);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
  font-size: var(--text-base);
  line-height: var(--line-height-tight);
}

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

.btn--primary:hover, .btn--primary:focus {
  background-color: #d97706;
  color: var(--white);
  text-decoration: none;
}

.btn--secondary {
  background-color: var(--white);
  color: var(--secondary-blue);
  border: 1px solid var(--secondary-blue);
}

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

.btn--ghost {
  background-color: transparent;
  color: var(--secondary-blue);
}

.btn--ghost:hover, .btn--ghost:focus {
  background-color: var(--light-gray);
  color: var(--primary-blue);
}

/* Cards */
.card {
  background-color: var(--white);
  border: 1px solid var(--light-gray);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--primary-blue);
}

/* Card Images */
.card img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  object-fit: cover;
}

/* Team member images */
.member-photo {
  background-color: var(--light-gray);
  height: 150px;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-gray);
  font-size: var(--text-lg);
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  background-color: var(--white);
}

.table th,
.table td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--light-gray);
}

.table th {
  background-color: var(--light-gray);
  font-weight: 600;
  color: var(--dark-gray);
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr:hover {
  background-color: var(--light-gray);
}

/* Hero Banner */
.hero {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  color: var(--white);
  padding: var(--spacing-xxxxl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.hero__title {
  font-size: var(--text-4xl);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-tight);
}

.hero__subtitle {
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-relaxed);
}

/* Section */
.section {
  padding: var(--spacing-xxxxl) 0;
}

.section__title {
  text-align: center;
  margin-bottom: var(--spacing-xxxl);
  color: var(--primary-blue);
  position: relative;
}

.section__title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background-color: var(--accent-orange);
  margin: var(--spacing-sm) auto 0;
}

.section__description {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  color: var(--neutral-gray);
}

/* Grid Layouts */
.grid--3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.grid--2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
}

.grid--4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

/* Responsive Design */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  .header-top {
    flex-direction: row;
    padding: var(--spacing-md) 0;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
  
  .main-nav {
    display: block;
  }
  
  .nav-menu {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 0;
  }
  
  .nav-item {
    position: relative;
  }
  
  .dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    z-index: 100;
  }
  
  .floating-contact {
    justify-content: flex-end;
  }
  
  .contact-item {
    margin-left: var(--spacing-xl);
  }
  
  .hero__title {
    font-size: var(--text-4xl);
  }
  
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: var(--text-4xl);
  }
  
  .nav-menu {
    gap: var(--spacing-md);
  }
  
  .nav-link {
    padding: var(--spacing-md) var(--spacing-md);
  }
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus management for accessibility */
.focusable:focus {
  outline: 2px solid var(--secondary-blue);
  outline-offset: 2px;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

.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);
}

.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);
}

.p-sm {
  padding: var(--spacing-sm);
}

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

.p-lg {
  padding: var(--spacing-lg);
}

.p-xl {
  padding: var(--spacing-xl);
}

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Animation for smooth transitions */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Print styles */
@media print {
  .header,
  .floating-contact,
  .footer {
    display: none;
  }
  
  .main-content {
    margin-top: 0;
  }
}