/* Data Flow Minimal - Internet Recharge Informational Website */

:root {
  --primary-blue: #3B82F6;
  --light-blue: #E0F2FE;
  --soft-grey: #F3F4F6;
  --text-dark: #1F2937;
  --text-light: #6B7280;
  --white: #FFFFFF;
  --border-color: #E5E7EB;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
}

/* Header Navigation */
header {
  background-color: var(--white);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: color 0.3s ease;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--primary-blue);
}

.nav-links a.active {
  color: var(--primary-blue);
  border-bottom: 2px solid var(--primary-blue);
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
  padding: 5rem 2rem;
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.1rem;
  color: var(--text-light);
  line-height: 1.8;
}

/* Content Layout */
.content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section {
  margin-bottom: 4rem;
}

.section h2 {
  font-size: 2rem;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--light-blue);
  display: inline-block;
}

.section p {
  font-size: 1.05rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 1rem;
  max-width: 900px;
}

/* Info Cards */
.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.info-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.info-card:hover {
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.1);
  border-color: var(--light-blue);
  transform: translateY(-2px);
}

.card-icon {
  width: 64px;
  height: 64px;
  background: var(--light-blue);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 2rem;
  color: var(--primary-blue);
}

.info-card h3 {
  font-size: 1.4rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
}

.info-card p {
  color: var(--text-light);
  line-height: 1.7;
  font-size: 1rem;
}

/* Data Flow Visualization */
.data-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 3rem 0;
  flex-wrap: wrap;
  padding: 2rem;
  background: var(--soft-grey);
  border-radius: 16px;
}

.flow-node {
  background: var(--white);
  border: 2px solid var(--light-blue);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  text-align: center;
  min-width: 180px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.flow-node-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--primary-blue);
}

.flow-node span {
  display: block;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 0.5rem;
}

.flow-arrow {
  color: var(--primary-blue);
  font-size: 2rem;
  animation: pulse 2s infinite;
}

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

/* FAQ Section */
.faq-container {
  max-width: 900px;
  margin: 2rem 0;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.faq-question {
  padding: 1.5rem 2rem;
  background: var(--soft-grey);
  cursor: pointer;
  font-weight: 600;
  color: var(--text-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s ease;
}

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

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--primary-blue);
}

.faq-answer {
  padding: 2rem;
  color: var(--text-light);
  line-height: 1.8;
  display: none;
  background: var(--white);
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question::after {
  content: '−';
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.contact-item {
  background: var(--soft-grey);
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--primary-blue);
}

.contact-item h4 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.contact-item p {
  color: var(--text-light);
  font-size: 1.1rem;
}

/* Footer */
footer {
  background-color: var(--soft-grey);
  padding: 3rem 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section h4 {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--light-blue);
}

.footer-section p {
  color: var(--text-light);
  line-height: 1.7;
  font-size: 0.95rem;
}

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

.footer-section ul li {
  margin-bottom: 0.7rem;
}

.footer-section ul li a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section ul li a:hover {
  color: var(--primary-blue);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-light);
  font-size: 0.9rem;
}

.disclaimer-box {
  background: var(--light-blue);
  border-left: 4px solid var(--primary-blue);
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 8px;
}

.disclaimer-box p {
  margin: 0;
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Responsive Design */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 1rem;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-content {
    font-size: 1rem;
  }
  
  .data-flow {
    flex-direction: column;
  }
  
  .flow-arrow {
    transform: rotate(90deg);
  }
  
  .info-cards {
    grid-template-columns: 1fr;
  }
  
  .content {
    padding: 2rem 1rem;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.2rem;
  }
  
  .hero {
    padding: 3rem 1rem;
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  nav {
    padding: 1rem;
  }
}