:root {
  --primary-color: #1877f2; /* Facebook Blue */
  --secondary-color: #1877f2;
  --text-color: #333;
  --light-bg: #f8f9fa;
  --white: #ffffff;
}

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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--white);
}

header {
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  padding: 1rem 5%;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links a {
  color: var(--secondary-color);
  text-decoration: none;
  margin-left: 20px;
  font-weight: 500;
  transition: color 0.3s;
}

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

.hero {
  padding: 120px 5% 60px;
  text-align: center;
  background: linear-gradient(135deg, #fff5f5 0%, #ffffff 100%);
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  color: var(--secondary-color);
}

.hero p {
  font-size: 1.2rem;
  color: #666;
  max-width: 600px;
  margin: 0 auto 40px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 15px 30px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: bold;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-android {
  background-color: #3ddc84; /* Android Green */
  color: white;
}

.btn-ios {
  background-color: #000000;
  color: white;
}

.btn i {
  margin-right: 10px;
  font-size: 1.2rem;
}

.features {
  padding: 80px 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-top: 40px;
}

.feature-card {
  background: var(--light-bg);
  padding: 30px;
  border-radius: 20px;
  text-align: center;
  transition: transform 0.3s;
}

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

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

footer {
  background-color: var(--secondary-color);
  color: white;
  padding: 40px 5%;
  text-align: center;
}

.footer-links {
  margin-bottom: 20px;
}

.footer-links a {
  color: #ddd;
  text-decoration: none;
  margin: 0 15px;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: white;
  text-decoration: underline;
}

.copyright {
  font-size: 0.8rem;
  opacity: 0.7;
}

/* SVG Icons placeholder styles */
.icon {
  width: 24px;
  height: 24px;
  fill: currentColor;
  vertical-align: middle;
  margin-right: 8px;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  .hero {
    padding-top: 100px;
  }
}