/* reset e base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  color: #333;
  line-height: 1.5;
}

a {
  color: #007BFF;
  text-decoration: none;
}

header .top-bar {
  background-color: #f5f5f5;
  padding: 10px 20px;
}

header .top-bar nav ul {
  list-style: none;
  display: flex;
  justify-content: flex-end;
}

header .top-bar nav ul li {
  margin-left: 20px;
}

header .hero {
  text-align: center;
  padding: 40px 20px;
  background-color: #ffffff;
}

header .hero .logo {
  max-width: 200px;
  height: auto;
  margin-bottom: 20px;
}

header .hero h1 {
  font-size: 2.8rem;
  line-height: 1.2;
}

header .hero h2 {
  margin-top: 20px;
  font-size: 1.6rem;
}

main .intro {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  text-align: center;
}

.video-section {
  margin: 40px 0;
  display: flex;
  justify-content: center;
}

.video-section video {
  width: 100%;
  max-width: 800px;
  height: auto;
}

.features {
  padding: 40px 20px;
  background-color: #f9f9f9;
}

.features .feature-item {
  max-width: 400px;
  margin: 20px auto;
  text-align: center;
}

.features .feature-item img {
  width: 100%;
  height: auto;
}

.gallery {
  padding: 40px 20px;
  text-align: center;
}

.gallery h2 {
  margin-bottom: 20px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 15px;
}

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

footer {
  background-color: #222;
  color: #eee;
  padding: 20px;
  text-align: center;
}

footer .footer-content p {
  margin-bottom: 8px;
}

/* responsive per smartphone */
@media (max-width: 768px) {
  header .hero h1 {
    font-size: 2rem;
  }
  header .hero h2 {
    font-size: 1.3rem;
  }
  .features .feature-item {
    margin: 20px 10px;
  }
}