body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

html, body {
    height: 100%;
    overflow-y: auto;
}

header {
    background: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

main {
    padding: 20px;
    flex: 1;
}

footer {
    text-align: center;
    padding: 10px 0;
    background-color: #333;
    color: #fff;
    position: relative; 
    width: 100%;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.1);
    margin-top: 20px; 
}


.card-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
}

.card {
    background-color: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 16px;
    width: 100%;
    box-sizing: border-box;
    text-align: left;
}

.card h3 {
    font-size: 1.5em;
    margin-bottom: 10px;
}

.card p {
    font-size: 1em;
    margin-bottom: 15px;
}

.card a {
    color: #007bff;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
}

.card a:hover {
    text-decoration: underline;
}

.svg-background {
    bottom: 0;
    left: 0;
    width: 80%; 
    pointer-events: none; 
    z-index: -1;  
    position: relative; /* footerの上部に配置するための基準 */
    text-align: left; /* SVGを中央に寄せる */
    margin-bottom: -20px; /* footerとの隙間調整。必要に応じて調整 */
  }