* {
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #000;
  color: #fff;
}

.hero {
  height: 100vh;
  background: radial-gradient(circle, #400, #000);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  color: #ff2b2b;
  letter-spacing: 3px;
}

.hero p {
  font-size: 20px;
  margin: 10px 0 25px;
}

.btn {
  background: #ff2b2b;
  color: #000;
  padding: 14px 30px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 4px;
}

nav {
  position: sticky;
  top: 0;
  background: #111;
  padding: 15px;
  text-align: center;
  z-index: 100;
}

nav a {
  color: #ff2b2b;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}

.section {
  padding: 60px 40px;
  text-align: center;
}

.section h2 {
  color: #ff2b2b;
  margin-bottom: 30px;
}

.dark {
  background: #0a0a0a;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
}

.card {
  background: #111;
  padding: 20px;
  border: 1px solid #ff2b2b33;
}

.card img {
  width: 100%;
  height: auto;
  margin-bottom: 15px;
}

footer {
  background: #111;
  text-align: center;
  padding: 15px;
  font-size: 14px;
  color: #aaa;
}