/* ============================================
   A Team F.E. Technology Group - Main Stylesheet
   Blue Theme with Thai Font Support
   ============================================ */

/* ============================================
   1. CSS Variables - Blue Color Theme
   ============================================ */
:root {
  /* Primary Colors - Blue Theme */
  --color-primary: #0066CC;
  --color-primary-dark: #004080;
  --color-primary-light: #E6F2FF;
  --color-accent: #3399FF;
  
  /* Text Colors */
  --color-text-dark: #333333;
  --color-text-light: #666666;
  --color-text-white: #FFFFFF;
  
  /* Background Colors */
  --color-bg-white: #FFFFFF;
  --color-bg-gray: #F5F5F5;
  --color-bg-blue-light: #E6F2FF;
  
  /* Spacing Scale */
  --spacing-xs: 0.5rem;    /* 8px */
  --spacing-sm: 1rem;      /* 16px */
  --spacing-md: 1.5rem;    /* 24px */
  --spacing-lg: 2rem;      /* 32px */
  --spacing-xl: 3rem;      /* 48px */
  --spacing-xxl: 4rem;     /* 64px */
  
  /* Typography */
  --font-family-base: 'Sarabun', 'Prompt', 'Kanit', 'Noto Sans Thai', 'Tahoma', 'Arial', sans-serif;
  --font-family-heading: 'Prompt', 'Kanit', 'Sarabun', 'Noto Sans Thai', sans-serif;
  
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-md: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-xxl: 2rem;      /* 32px */
  --font-size-xxxl: 2.5rem;   /* 40px */
  
  --line-height-base: 1.6;
  --line-height-heading: 1.3;
  
  /* Borders and Shadows */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Responsive Breakpoints */
  --breakpoint-tablet: 768px;
  --breakpoint-desktop: 1024px;
  --max-width-container: 1200px;
}

/* ============================================
   2. Reset and Base Styles
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ============================================
   3. Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  line-height: var(--line-height-heading);
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-xxxl);
}

h2 {
  font-size: var(--font-size-xxl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

h5, h6 {
  font-size: var(--font-size-md);
}

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

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

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

a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

ul, ol {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
}

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

strong, b {
  font-weight: 600;
}

em, i {
  font-style: italic;
}

/* ============================================
   4. Layout Utilities
   ============================================ */
.container {
  width: 100%;
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

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

.section-blue {
  background-color: var(--color-bg-blue-light);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

.grid-4 {
  grid-template-columns: 1fr;
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

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

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

.flex-column {
  display: flex;
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

/* Spacing Utilities */
.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); }

.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); }

.pt-sm { padding-top: var(--spacing-sm); }
.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }
.pt-xl { padding-top: var(--spacing-xl); }

.pb-sm { padding-bottom: var(--spacing-sm); }
.pb-md { padding-bottom: var(--spacing-md); }
.pb-lg { padding-bottom: var(--spacing-lg); }
.pb-xl { padding-bottom: var(--spacing-xl); }

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

.text-sm { font-size: var(--font-size-sm); }
.text-md { font-size: var(--font-size-md); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

/* Display Utilities */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* ============================================
   5. Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-family-base);
  font-size: var(--font-size-md);
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  line-height: 1.5;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-white);
  border-color: var(--color-primary);
}

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

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

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

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   6. Cards
   ============================================ */
.card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
}

.card-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-title {
  font-size: var(--font-size-xl);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-sm);
}

.card-description {
  color: var(--color-text-light);
  line-height: var(--line-height-base);
}

/* ============================================
   7. Images
   ============================================ */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.img-responsive {
  width: 100%;
  height: auto;
}

.img-rounded {
  border-radius: var(--border-radius-md);
}

.img-circle {
  border-radius: 50%;
}

/* ============================================
   8. Navigation Component
   ============================================ */
.main-nav {
  background-color: var(--color-bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
}

.nav-container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

/* Brand/Logo Section */
.nav-brand a {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.nav-brand a:hover {
  opacity: 0.8;
}

.nav-brand a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--border-radius-sm);
}

.brand-logo {
  width: 50px;
  height: 50px;
  object-fit: contain;
  border-radius: var(--border-radius-sm);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-en {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary-dark);
  line-height: 1.2;
}

.brand-th {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.2;
}

/* Mobile Hamburger Menu Button */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
  transition: transform var(--transition-fast);
}

.nav-toggle:hover {
  transform: scale(1.1);
}

.nav-toggle:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

.nav-toggle span {
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

/* Hamburger animation when menu is open */
.nav-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(-20px);
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Navigation Menu */
.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-bg-white);
  box-shadow: var(--shadow-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), padding var(--transition-base);
}

.nav-menu.active {
  max-height: 300px;
  padding: var(--spacing-md) 0;
}

.nav-menu li {
  margin: 0;
}

/* Navigation Links */
.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-family-base);
  font-size: var(--font-size-md);
  font-weight: 500;
  color: var(--color-text-dark);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 4px solid transparent;
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-blue-light);
  border-left-color: var(--color-accent);
}

.nav-link:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

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

/* ============================================
   9. Footer Component
   ============================================ */
.main-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-text-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

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

.footer-section h3 {
  font-size: var(--font-size-xl);
  color: var(--color-text-white);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  color: var(--color-text-white);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.footer-section p {
  color: var(--color-bg-blue-light);
  line-height: var(--line-height-base);
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: var(--color-text-white);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

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

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-section ul li a {
  color: var(--color-bg-blue-light);
  text-decoration: none;
  transition: all var(--transition-fast);
  display: inline-block;
}

.footer-section ul li a:hover {
  color: var(--color-text-white);
  padding-left: var(--spacing-xs);
}

.footer-bottom {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-md) 0;
  margin-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-bg-blue-light);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* ============================================
   10. Hero Section Component
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-white);
  padding: var(--spacing-xxl) var(--spacing-md);
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Optional: Add a subtle pattern overlay */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  padding: 0 var(--spacing-md);
}

.hero-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  text-align: center;
  word-spacing: normal;
}

.hero-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-bg-blue-light);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-base);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: center;
}

.hero-cta .btn {
  min-width: 200px;
}

/* Hero button overrides for better visibility on blue background */
.hero-cta .btn-primary {
  background-color: var(--color-text-white);
  color: var(--color-primary);
  border-color: var(--color-text-white);
}

.hero-cta .btn-primary:hover {
  background-color: var(--color-bg-blue-light);
  border-color: var(--color-bg-blue-light);
  color: var(--color-primary-dark);
}

.hero-cta .btn-secondary {
  background-color: transparent;
  color: var(--color-text-white);
  border-color: var(--color-text-white);
}

.hero-cta .btn-secondary:hover {
  background-color: var(--color-text-white);
  color: var(--color-primary);
  border-color: var(--color-text-white);
}

/* ============================================
   10.5. Content Sections
   ============================================ */
.section-title {
  font-size: var(--font-size-xxl);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-lg);
  font-weight: 700;
  text-align: center;
}

.section-content {
  max-width: 900px;
  margin: 0 auto;
}

.section-content p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-base);
}

/* Blue accent section styling */
.section-blue .section-title {
  color: var(--color-primary-dark);
}

.section-blue .card {
  background-color: var(--color-bg-white);
  border: 1px solid rgba(0, 102, 204, 0.1);
}

.section-blue .card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 24px rgba(0, 102, 204, 0.15);
}

/* Page Header Component */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-white);
  padding: var(--spacing-xxl) var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.page-title {
  font-size: var(--font-size-xxl);
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-heading);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 1;
}

.page-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-bg-blue-light);
  line-height: var(--line-height-base);
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Content Block Component */
.content-block {
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.content-block:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.content-block:last-child {
  margin-bottom: 0;
}

.content-block h3 {
  font-size: var(--font-size-xl);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.content-block p {
  color: var(--color-text-light);
  line-height: var(--line-height-base);
  margin-bottom: var(--spacing-sm);
}

.content-block p:last-child {
  margin-bottom: 0;
}

.content-block ul,
.content-block ol {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.content-block ul:last-child,
.content-block ol:last-child {
  margin-bottom: 0;
}

/* ============================================
   10.6. Contact Information Component
   ============================================ */
.contact-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.contact-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.contact-icon {
  font-size: 2.5rem;
  line-height: 1;
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-light);
  border-radius: var(--border-radius-md);
}

.contact-details {
  flex: 1;
  min-width: 0;
}

.contact-details h3,
.contact-details h4 {
  font-size: var(--font-size-lg);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.contact-details p {
  font-size: var(--font-size-lg);
  color: var(--color-text-dark);
  margin: 0;
  line-height: 1.5;
}

.contact-details a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 500;
  font-size: 1em;
  display: inline;
  white-space: nowrap;
}

.contact-details a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.contact-details a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

.contact-details img {
  margin-top: var(--spacing-sm);
  max-width: 150px;
  height: auto;
  border-radius: var(--border-radius-sm);
}

/* ============================================
   10.7. Map Container Component
   ============================================ */
.map-container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.map-container iframe {
  width: 100%;
  height: 450px;
  border: none;
  display: block;
}

.map-placeholder {
  background-color: var(--color-bg-gray);
  border: 2px dashed var(--color-primary-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xxl) var(--spacing-lg);
  text-align: center;
  min-height: 450px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.map-placeholder:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
}

.map-placeholder p {
  font-size: var(--font-size-xl);
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-sm);
}

.map-placeholder p:first-child {
  font-size: var(--font-size-xxl);
  margin-bottom: var(--spacing-md);
}

.map-placeholder .text-light {
  font-size: var(--font-size-md);
  color: var(--color-text-light);
  font-style: italic;
}

/* ============================================
   11. Responsive Breakpoints
   ============================================ */

/* Tablet: 768px and up */
@media (min-width: 768px) {
  :root {
    --font-size-base: 16px;
    --font-size-xxxl: 3rem;    /* 48px */
  }
  
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  .section {
    padding: var(--spacing-xxl) 0;
  }
  
  /* Grid System - Tablet */
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Hero Section - Tablet */
  .hero {
    padding: var(--spacing-xxl) var(--spacing-lg);
    min-height: 600px;
  }
  
  .hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero-cta {
    flex-direction: row;
    gap: var(--spacing-lg);
  }
  
  /* Navigation - Tablet and Desktop */
  .nav-container {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .brand-en {
    font-size: var(--font-size-xl);
  }
  
  .brand-th {
    font-size: var(--font-size-md);
  }
  
  .brand-logo {
    width: 60px;
    height: 60px;
  }
  
  /* Hide hamburger menu on tablet and desktop */
  .nav-toggle {
    display: none;
  }
  
  /* Show horizontal menu on tablet and desktop */
  .nav-menu {
    position: static;
    flex-direction: row;
    max-height: none;
    overflow: visible;
    box-shadow: none;
    padding: 0;
    gap: var(--spacing-xs);
  }
  
  .nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: none;
    border-bottom: 3px solid transparent;
    border-radius: var(--border-radius-sm);
  }
  
  .nav-link:hover {
    background-color: var(--color-bg-blue-light);
    border-bottom-color: var(--color-accent);
    border-left-color: transparent;
  }
  
  .nav-link.active {
    background-color: var(--color-primary-light);
    border-bottom-color: var(--color-primary);
    border-left-color: transparent;
  }
  
  /* Footer - Tablet */
  .footer-container {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 var(--spacing-lg);
  }
  
  .footer-section:first-child {
    grid-column: 1 / -1;
  }
  
  .footer-bottom {
    padding: var(--spacing-md) var(--spacing-lg) 0;
  }
  
  /* Contact Info - Tablet */
  .contact-info {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 var(--spacing-lg);
  }
}

/* Desktop: 1024px and up */
@media (min-width: 1024px) {
  :root {
    --font-size-base: 18px;
    --font-size-xxxl: 3.5rem;  /* 56px */
  }
  
  .container {
    padding: 0 var(--spacing-xl);
  }
  
  /* Grid System - Desktop */
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
  
  /* Hero Section - Desktop */
  .hero {
    padding: calc(var(--spacing-xxl) * 1.5) var(--spacing-xl);
    min-height: 650px;
  }
  
  .hero-title {
    font-size: 4.5rem;
    line-height: 1.2;
  }
  
  .hero-subtitle {
    font-size: var(--font-size-xl);
  }
  
  /* Navigation - Desktop */
  .nav-container {
    padding: var(--spacing-md) var(--spacing-xl);
  }
  
  .nav-menu {
    gap: var(--spacing-sm);
  }
  
  .nav-link {
    padding: var(--spacing-sm) var(--spacing-lg);
  }
  
  /* Footer - Desktop */
  .footer-container {
    grid-template-columns: repeat(3, 1fr);
    padding: 0 var(--spacing-xl);
  }
  
  .footer-section:first-child {
    grid-column: auto;
  }
  
  .footer-bottom {
    padding: var(--spacing-md) var(--spacing-xl) 0;
  }
  
  /* Contact Info - Desktop */
  .contact-info {
    grid-template-columns: repeat(3, 1fr);
    padding: 0 var(--spacing-xl);
  }
}

/* ============================================
   11. 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;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-text-white);
  padding: var(--spacing-sm);
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   12. Print Styles
   ============================================ */
@media print {
  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }
  
  .no-print {
    display: none;
  }
  
  a {
    text-decoration: underline;
  }
  
  a[href]:after {
    content: " (" attr(href) ")";
  }
}