* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f7f7fb;
    color: #1f2937;
    line-height: 1.6;
}

.site-header {
    background: #1a73e8;
    color: #ffffff;
    padding: 24px 20px;
}

.tagline {
    margin: 6px 0 0;
    opacity: 0.9;
}

main {
    max-width: 900px;
    margin: 24px auto;
    padding: 0 20px 24px;
}

.card {
    background: #ffffff;
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 16px;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

button {
    background: #1a73e8;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    cursor: pointer;
}

button:hover {
    background: #1558b3;
}

.site-footer {
    text-align: center;
    padding: 16px;
    color: #6b7280;
}