/* Reset and base styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    text-align: center;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: rgba(0, 0, 0, 0.3);
    padding: 40px 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

h1 {
    margin: 0;
    font-size: 3rem;
    letter-spacing: 2px;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
}

p {
    font-size: 1.2rem;
    margin-top: 10px;
    color: #dcdcdc;
    text-shadow: 1px 1px 5px rgba(0,0,0,0.5);
}

main {
    flex-grow: 1;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.quiz-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    max-width: 900px;
    width: 100%;
}

.quiz-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid #fff;
    border-radius: 15px;
    padding: 20px 0;
    font-size: 1.3rem;
    font-weight: 600;
    color: #fff;
    cursor: pointer;
    box-shadow: 0 8px 15px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    user-select: none;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.quiz-btn:hover {
    background: #fff;
    color: #764ba2;
    border-color: #764ba2;
    box-shadow: 0 12px 20px rgba(118, 75, 162, 0.6);
    transform: translateY(-5px);
}

footer {
    background: rgba(0, 0, 0, 0.3);
    color: #ddd;
    padding: 15px 20px;
    font-size: 0.9rem;
    box-shadow: 0 -4px 15px rgba(0,0,0,0.3);
}