/* =====================================================
   Qatar Coverage Website - Main Stylesheet
   Environment-Based Visualization Theme
   ===================================================== */

/* CSS Variables */
:root {
  /* Color Palette */
  --sand-light: #F5F0E6;
  --sand-beige: #E8DFC9;
  --sand-medium: #D4C4A8;
  --sky-blue: #87CEEB;
  --sky-blue-light: #B0E0E6;
  --sky-blue-dark: #5BA3C6;
  --navy-dark: #1A2A3A;
  --navy-medium: #2C3E50;
  --navy-light: #34495E;
  --white: #FFFFFF;
  --gray-light: #F8F9FA;
  --gray-medium: #6C757D;
  --accent-teal: #20B2AA;
  --accent-orange: #E67E22;
  
  /* Typography */
  --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-heading: 'Georgia', 'Times New Roman', serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(26, 42, 58, 0.1);
  --shadow-md: 0 4px 12px rgba(26, 42, 58, 0.15);
  --shadow-lg: 0 8px 24px rgba(26, 42, 58, 0.2);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--sand-light);
  color: var(--navy-dark);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--navy-dark);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

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

a {
  color: var(--sky-blue-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

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

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

/* =====================================================
   Header & Navigation
   ===================================================== */
header {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy-medium) 100%);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--sky-blue) 0%, var(--accent-teal) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: bold;
  font-size: 1.2rem;
}

.logo-text {
  color: var(--white);
  font-size: 1.4rem;
  font-family: var(--font-heading);
  font-weight: 600;
}

.logo-text span {
  color: var(--sky-blue-light);
}

/* Navigation */
nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  gap: var(--spacing-xs);
}

.nav-menu li {
  margin: 0;
}

.nav-menu a {
  color: var(--white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: block;
  font-size: 0.95rem;
}

.nav-menu a:hover,
.nav-menu a.active {
  background-color: rgba(135, 206, 235, 0.2);
  color: var(--sky-blue-light);
}

/* =====================================================
   Hero Section
   ===================================================== */
.hero {
  background: linear-gradient(135deg, var(--sand-beige) 0%, var(--sky-blue-light) 50%, var(--sand-light) 100%);
  padding: var(--spacing-xxl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%235BA3C6' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--navy-dark);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--navy-medium);
  margin-bottom: var(--spacing-lg);
}

/* Hero Visual */
.hero-visual {
  margin-top: var(--spacing-xl);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.environment-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.environment-card:hover {
  transform: translateY(-5px);
}

.environment-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-md);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.environment-card.urban .environment-icon {
  background: linear-gradient(135deg, var(--sky-blue) 0%, var(--sky-blue-dark) 100%);
}

.environment-card.indoor .environment-icon {
  background: linear-gradient(135deg, var(--sand-medium) 0%, var(--accent-orange) 100%);
}

.environment-card.desert .environment-icon {
  background: linear-gradient(135deg, var(--sand-beige) 0%, var(--sand-medium) 100%);
}

.environment-card h3 {
  margin-bottom: var(--spacing-xs);
}

.environment-card p {
  font-size: 0.9rem;
  margin: 0;
}

/* Signal Strength Indicator */
.signal-indicator {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-top: var(--spacing-sm);
}

.signal-bar {
  width: 8px;
  background: var(--gray-light);
  border-radius: 2px;
}

.signal-bar.active {
  background: var(--accent-teal);
}

.signal-bar:nth-child(1) { height: 8px; }
.signal-bar:nth-child(2) { height: 14px; }
.signal-bar:nth-child(3) { height: 20px; }
.signal-bar:nth-child(4) { height: 26px; }
.signal-bar:nth-child(5) { height: 32px; }

/* =====================================================
   Main Content Sections
   ===================================================== */
main {
  flex: 1;
  padding: var(--spacing-xl) 0;
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
}

.section-header h2 {
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--sky-blue) 0%, var(--accent-teal) 100%);
  border-radius: 2px;
}

/* Info Cards Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.info-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border-left: 4px solid var(--sky-blue);
}

.info-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.info-card h3 {
  color: var(--navy-dark);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.info-card h3 .icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--sky-blue-light) 0%, var(--sky-blue) 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.info-card p {
  margin: 0;
}

/* Feature Blocks */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.feature-block:nth-child(even) {
  direction: rtl;
}

.feature-block:nth-child(even) > * {
  direction: ltr;
}

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

.feature-visual {
  background: linear-gradient(135deg, var(--sand-beige) 0%, var(--sky-blue-light) 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Layered Diagram */
.layered-diagram {
  width: 100%;
  max-width: 400px;
}

.diagram-layer {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.diagram-layer .layer-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.diagram-layer .layer-content h4 {
  margin: 0 0 4px 0;
  font-size: 1rem;
}

.diagram-layer .layer-content p {
  margin: 0;
  font-size: 0.85rem;
}

/* =====================================================
   Page-Specific Styles
   ===================================================== */

/* Page Header */
.page-header {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy-medium) 100%);
  padding: var(--spacing-xl) 0;
  text-align: center;
  color: var(--white);
}

.page-header h1 {
  color: var(--white);
  margin-bottom: var(--spacing-xs);
}

.page-header p {
  color: var(--sky-blue-light);
  max-width: 600px;
  margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
  background: var(--white);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--sand-beige);
}

.breadcrumb ul {
  display: flex;
  list-style: none;
  margin: 0;
  gap: var(--spacing-xs);
}

.breadcrumb li::after {
  content: '/';
  margin-left: var(--spacing-xs);
  color: var(--gray-medium);
}

.breadcrumb li:last-child::after {
  content: '';
}

.breadcrumb a {
  color: var(--sky-blue-dark);
}

.breadcrumb li:last-child a {
  color: var(--navy-medium);
  pointer-events: none;
}

/* Content Page */
.content-page {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-lg) auto;
  box-shadow: var(--shadow-sm);
}

.content-page h2 {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--sand-beige);
}

.content-page h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

/* FAQ Section */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--spacing-md);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy-dark);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--sand-light);
}

.faq-question .icon {
  font-size: 1.2rem;
  color: var(--sky-blue-dark);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 var(--spacing-md);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
  padding: var(--spacing-md);
  max-height: 500px;
}

.faq-answer p {
  margin: 0;
}

/* Contact Form */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.contact-info {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy-medium) 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  color: var(--white);
}

.contact-info h3 {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

.contact-item {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  background: rgba(135, 206, 235, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item .details h4 {
  color: var(--sky-blue-light);
  margin: 0 0 4px 0;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.contact-item .details p {
  color: var(--white);
  margin: 0;
}

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

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--navy-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--sand-beige);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--sky-blue);
}

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

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--sky-blue) 0%, var(--sky-blue-dark) 100%);
  color: var(--white);
}

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

/* =====================================================
   Footer
   ===================================================== */
footer {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy-medium) 100%);
  color: var(--white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: auto;
}

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

.footer-section h4 {
  color: var(--sky-blue-light);
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

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

.footer-section a {
  color: var(--white);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer-section a:hover {
  opacity: 1;
}

.footer-section p {
  color: var(--white);
  opacity: 0.8;
  margin: 0;
}

/* Disclaimer */
.disclaimer {
  background: rgba(135, 206, 235, 0.1);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-left: 3px solid var(--sky-blue);
}

.disclaimer p {
  color: var(--sky-blue-light);
  font-size: 0.85rem;
  margin: 0;
  line-height: 1.6;
}

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

.footer-bottom p {
  color: var(--white);
  opacity: 0.6;
  font-size: 0.85rem;
  margin: 0;
}

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

.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); }

.hidden { display: none !important; }

/* Highlight Box */
.highlight-box {
  background: linear-gradient(135deg, var(--sky-blue-light) 0%, var(--sand-light) 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.highlight-box.accent {
  background: linear-gradient(135deg, var(--accent-teal) 0%, var(--sky-blue) 100%);
  color: var(--white);
}

.highlight-box.accent h3,
.highlight-box.accent p {
  color: var(--white);
}

/* Info Banner */
.info-banner {
  background: var(--sand-beige);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.info-banner .icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.info-banner p {
  margin: 0;
}

/* =====================================================
   Responsive Design
   ===================================================== */
@media (max-width: 992px) {
  .hero-visual {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .feature-block {
    grid-template-columns: 1fr;
  }
  
  .feature-block:nth-child(even) {
    direction: ltr;
  }
  
  .contact-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: 0;
    display: none;
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-menu a {
    padding: var(--spacing-sm);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
  
  .content-page {
    padding: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .environment-card {
    padding: var(--spacing-md);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
}

/* =====================================================
   Animations
   ===================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

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

/* Print Styles */
@media print {
  header, footer, .nav-toggle, .btn {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .hero {
    background: #f0f0f0;
    padding: 1rem;
  }
  
  .content-page {
    box-shadow: none;
    padding: 0;
  }
}