* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #0a1a2b;
  color: #d0e8ff;
  overflow-x: hidden;
}
a {
  color: #5ac8fa;
  text-decoration: none;
}
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: #0e2a4f;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.8);
}
.logo {
  font-size: 1.7rem;
  font-weight: 700;
  color: #7ec8f7;
}
.nav-links {
  display: flex;
  gap: 1.5rem;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}
.hamburger div {
  width: 25px;
  height: 3px;
  background: #d0e8ff;
  border-radius: 2px;
}
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 60px;
    right: 0;
    background: #0e2a4f;
    flex-direction: column;
    width: 200px;
    height: 100vh;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }
  .nav-links.active {
    transform: translateX(0);
  }
  .hamburger {
    display: flex;
  }
}
.hero {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 60px;
  background: linear-gradient(135deg, #072f5f, #0a1a2b);
}
.card-3d {
  background: #11497b;
  padding: 3rem 2.5rem;
  border-radius: 25px;
  box-shadow: 0 30px 60px rgba(8, 38, 74, 0.7);
  text-align: center;
  transition: transform 0.3s ease;
  color: #d0e8ff;
  user-select: none;
  cursor: default;
}
.card-3d:hover {
  transform: rotateY(12deg) rotateX(7deg);
}

/* Floating animation */
@keyframes floatAnim {
  0%, 100% { transform: translateY(0) }
  50% { transform: translateY(-15px) }
}
.floating {
  animation: floatAnim 4s ease-in-out infinite;
}

.btn {
  background: #5ac8fa;
  color: #072f5f;
  padding: 0.8rem 2.5rem;
  border-radius: 30px;
  font-weight: 700;
  transition: background 0.3s ease;
  display: inline-block;
  margin-top: 1.5rem;
  box-shadow: 0 5px 15px rgba(90, 200, 250, 0.6);
}
.btn:hover {
  background: #3aa1e8;
  box-shadow: 0 8px 20px rgba(58, 161, 232, 0.8);
}

.section {
  padding: 4rem 2rem;
  text-align: center;
}
.dark-bg {
  background: #0a2d58;
  box-shadow: inset 0 0 50px rgba(0,0,0,0.3);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.feature {
  background: #0f4e8c;
  padding: 2rem;
  border-radius: 18px;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  color: #c9e4ff;
  user-select: none;
  cursor: default;
}
.feature:hover {
  transform: translateY(-10px) rotateY(8deg) rotateX(6deg);
  box-shadow: 0 30px 60px rgba(12, 75, 141, 0.8);
}

footer {
  text-align: center;
  padding: 2rem;
  background: #072f5f;
  font-size: 0.9rem;
  color: #7ec8f7;
}