* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f4f7f9;
    color: #333;
}

header {
    background-color: #ffffff;
    padding: 1rem 5%;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-weight: bold;
    font-size: 1.5rem;
    color: #2c3e50;
}

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

nav ul li a {
    text-decoration: none;
    color: #2c3e50;
    margin-left: 20px;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #3498db;
}

.hero {
    text-align: center;
    padding: 60px 5%;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.quiz-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.quiz-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    width: 300px;
    transition: transform 0.3s;
}

.quiz-card:hover {
    transform: translateY(-10px);
}

.quiz-card h2 {
    color: #3498db;
    margin-bottom: 15px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 20px;
}

button:hover {
    background-color: #2980b9;
}

footer {
    text-align: center;
    padding: 40px;
    background: #2c3e50;
    color: white;
    margin-top: 50px;
}