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

body {
    font-family: 'Nunito', sans-serif;
    color: #333;
    background-color: #f9fafb;
    scroll-behavior: smooth;
}

header {
    background: linear-gradient(120deg, #0077b6, #00b4d8);
    color: white;
    text-align: center;
    padding: 80px 20px 100px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 40px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

nav ul {
    display: flex;
    gap: 25px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s;
}

nav a:hover {
    color: #ffdd00;
}

.hero h2 {
    margin-top: 40px;
    font-size: 2.3rem;
}

.hero p {
    margin: 15px 0;
    font-size: 1.1rem;
}

button {
    background: #ffdd00;
    color: #333;
    border: none;
    padding: 12px 25px;
    font-weight: 700;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #ffee58;
}

section {
    padding: 60px 20px;
    text-align: center;
    max-width: 900px;
    margin: auto;
}

h2 {
    margin-bottom: 20px;
    color: #023e8a;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.course-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.course-card:hover {
    transform: translateY(-5px);
}

footer {
    background: #023e8a;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 0.9rem;
}