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

body {
  font-family: "Poppins", sans-serif;
  color: #333;
  line-height: 1.6;
  background-color: #f9f9f9;
}

header {
  background: #0a0a0a;
  color: #fff;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  margin: auto;
}

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

nav li {
  margin-left: 1.5rem;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: #00bcd4;
}

.hero {
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url('https://images.unsplash.com/photo-1498050108023-c5249f4df085?auto=format&fit=crop&w=1600&q=80')
    center/cover no-repeat;
  color: white;
  text-align: center;
  padding: 6rem 2rem;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background: #00bcd4;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  margin-top: 1rem;
  transition: background 0.3s ease;
}

.btn:hover {
  background: #0097a7;
}

.section {
  padding: 4rem 2rem;
}

.section.dark {
  background: #111;
  color: #eee;
}

.section h2 {
  text-align: center;
  margin-bottom: 1.5rem;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.card {
  background: #fff;
  border-radius: 10px;
  padding: 2rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.dark .card {
  background: #1a1a1a;
  color: #ccc;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}

input,
textarea {
  padding: 0.8rem;
  border: none;
  border-radius: 5px;
  width: 100%;
}

button {
  background: #00bcd4;
  color: #fff;
  padding: 0.8rem;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #0097a7;
}

footer {
  text-align: center;
  background: #0a0a0a;
  color: white;
  padding: 1.5rem 0;
  font-size: 0.9rem;
}