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

body {
    font-family: Arial, sans-serif;
    background: #f7f8fa;
    color: #333;
    line-height: 1.6;
}

.site-header {
    background: #e63946;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.site-header h1 {
    font-size: 1.5rem;
}

.site-header nav a {
    color: white;
    text-decoration: none;
    margin-left: 1rem;
    font-size: 1rem;
}

.site-header nav a:hover {
    font-weight: bold;
}

.main-content {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.main-content h2 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.set-list {
    display: grid;
    gap: 1rem;
}

.card-set h3 {
    margin-bottom: 0.4rem;
    font-size: 1.1rem;
}

.card-set p {
    color: #555;
    font-size: 0.9rem;
}

.site-footer {
    background: #e63946;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

.site-footer {
    margin-top: 0.5rem;
}

.site-footer a {
    color: #ffffff;
    text-decoration: none;
}

.site-footer a:hover {
    color: white;
    text-decoration: none;
}

.card-set {
    background: white;
    border: 1px solid #ccc;
    border-radius: 6px;
    padding: 1rem;
    text-decoration: none;
    color: #003366;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: all 0.2s ease-in-out;
    border-left: 5px solid #e63946;
}

.card-set:hover {
    background: #eaf1ff;
    border-color: #003366;
    box-shadow: 0 4px 8px rgba(0, 51, 102, 0.1);
}

@media (max-width: 600px) {
    .site-header {
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem;
    }

    .site-header h1 {
        font-size: 1.3rem;
        margin-bottom: 0.5rem;
    }

    .site-header nav {
        width: 100%;
        display: flex;
        flex-direction: column;
        gap: 0.3rem;
    }

    .site-header nav a {
        margin: 0;
        font-size: 0.95rem;
    }

    .main-content {
        padding: 0 1rem;
    }

    .main-content h2 {
        font-size: 1.2rem;
    }

    .card-set {
        padding: 0.8rem;
        font-size: 0.9rem;
    }
}