:root {
  --primary-blue: #003366;
  --secondary-blue: #0066cc;
  --accent-blue: #0099ff;
  --light-blue: #e6f2ff;
  --dark-blue: #001a33;
}

body {
  font-family: "Arial", sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  line-height: 1.6;
}

header {
  background: var(--primary-blue);
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.container {
  width: 85%;
  max-width: 1200px;
  margin: 0 auto;
}

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

.logo {
  height: 32px;
}

nav ul {
  display: flex;
  list-style: none;
}

nav ul li {
  margin-left: 2rem;
}

nav ul li a {
  color: white;
  text-decoration: none;
  transition: color 0.3s;
}

nav ul li a:hover {
  color: var(--accent-blue);
}

.hero {
  background: linear-gradient(
    135deg,
    var(--primary-blue),
    var(--secondary-blue)
  );
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  background: var(--accent-blue);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
  min-width: 250px;
  animation: gradientMove 5s ease infinite;
  background: linear-gradient(
    270deg,
    var(--primary-blue),
    var(--secondary-blue),
    var(--dark-blue)
  );
  background-size: 600% 600%;
  box-shadow: 0 0 20px rgba(0, 153, 255, 0.4);
}

.features {
  padding: 4rem 0;
  background: var(--light-blue);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  color: var(--primary-blue);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 2rem;
}
.list {
  display: none;
}
.header__wrapper {
  display: none;
}
@media (min-width: 420px) {
  .header__wrapper {
    display: block;
  }
}
@media (min-width: 900px) {
  .features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
  .btn {
    width: 350px;
    font-size: 30px;
  }
}

.feature-card {
  background: white;
  padding: 1.5rem;
  border-radius: 6px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.feature-card h3 {
  color: var(--secondary-blue);
}

footer {
  background: var(--dark-blue);
  color: white;
  padding: 2rem 0;
  text-align: center;
}
.burger {
  background-image: url("/images/burger.png");
  width: 30px;
  height: 30px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  background-color: transparent;
  border: none;
  margin: 0 auto;
  display: block;
}
.header__tab-menu {
  width: 220px;
  background: #0066cc;
  padding: 20px 40px;
  position: absolute;
  right: 7%;
  list-style: none;
  display: none;
}
.header__wrapper {
  min-height: 32px;
  min-width: 32px;
}
.header__tab-menu-item a {
  color: white;
  text-decoration: none;
}
.active {
  display: block;
}
@media (min-width: 1440px) {
  .list {
    display: flex;
  }
  .header__wrapper {
    display: none;
  }
}
@keyframes gradientMove {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}