/* =========================
   共通設定
========================= */

body {
    font-family: Arial, sans-serif;
    text-align: center;

    margin: 0;
    padding: 20px;

    background: linear-gradient(
        135deg,
        #0f172a,
        #1e293b
    );

    color: white;

    min-height: 100vh;
}

h1 {
    color: white;
}

h2 {
    color: #00d4ff;
}

hr {
    margin: 25px 0;
}

/* =========================
   フォーム
========================= */

form {
    margin-top: 20px;
}

input[type="text"] {

    padding: 10px;

    width: 250px;

    font-size: 16px;
}

.quiz-option {

    margin: 10px;

    padding: 10px;
}

/* =========================
   ボタン
========================= */

button {

    background-color: #3498db;

    color: white;

    border: none;

    padding: 12px 24px;

    font-size: 16px;

    border-radius: 8px;

    cursor: pointer;
}

button:hover {

    opacity: 0.9;
}

/* =========================
   戻るボタン
========================= */

.back-links {

    display: flex;

    justify-content: center;

    gap: 20px;

    margin-top: 30px;

    flex-wrap: wrap;
}

.back-link a {

    display: inline-block;

    background: #3498db;

    color: white;

    padding: 12px 20px;

    border-radius: 10px;

    text-decoration: none;

    font-weight: bold;

    transition: 0.3s;
}

.back-link a:hover {

    background: #2980b9;

    transform: translateY(-2px);
}