body {
    font-family: "MS PGothic", sans-serif;
    background-image: url("https://images.unsplash.com/photo-1507842217343-583bb7270b66?ixlib=rb-4.0.3&auto=format&fit=crop&w=1080&q=80");
    /* 背景画像もローカル化したい場合は↓のように変更
       background-image: url('config/images/background.jpg');
    */
    background-size: cover;
    background-position: center;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

#quiz-container {
    width: 70%;
    height: 95%;
    max-width: 1080px;
    max-height: 1920px;
    background: rgba(255, 255, 255, 0.85);
    padding: 60px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    border-radius: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.question {
    font-size: 42px;
    margin-bottom: 80px;
    text-align: center;
    max-width: 100%;
    text-transform: uppercase;
    font-weight: bold;
}

.option {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px 0;
    padding: 40px;
    background-color: #f7b267;
    color: #333;
    cursor: pointer;
    border-radius: 20px;
    font-weight: bold;
    font-size: 3em;
    text-transform: uppercase;
    transition: background-color 0.3s, transform 0.2s;
    width: calc(100% - 40px);
    max-width: 600px;
}

.option:hover {
    background-color: #f5a623;
    transform: scale(1.05);
}

#options {
    display: flex;
    flex-direction: column;
    gap: 30px;
    align-items: center;
}

#quiz {
    text-align: center;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

#start-container {
    text-align: center;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#start-button {
    padding: 50px 100px;
    font-size: 3em;
    background-color: #f7b267;
    color: #333;
    border: 5px solid white;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    text-transform: uppercase;
    transition: background-color 0.3s, transform 0.2s, box-shadow 0.3s;
    box-shadow: inset 0 0 10px white;
}

#start-button:hover {
    background-color: #f5a623;
    transform: scale(1.05);
}

.book-image {
    width: 200px;
    margin: 20px;
    cursor: pointer;
}

#book-images {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

#home-button {
    position: absolute;
    top: 20px;
    left: 120px;
    background-color: #6c757d;
    color: #fff;
    border: none;
    border-radius: 20px;
    padding: 10px 40px;
    font-size: 2em;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.2s;
}

#home-button:hover {
    background-color: #5a6268;
    transform: scale(1.05);
}

h1 {
    margin-bottom: 30px;
    font-size: 24px;
    font-weight: 500;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 30px;
    color: #666;
}

input {
    width: 500px;
    height: 80px;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 28px;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.3);
}

select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 20px;
    background: white;
    transition: border-color 0.3s;
}
select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 5px rgba(102, 126, 234, 0.3);
}

.login-btn {
    background: #0f65a7;
    color: white;
    border: none;
    height: 70px;
    font-weight: 600;
    font-size: 32px;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.3s ease;
    width: 300px;
    margin: 20px;
}

.login-btn:hover {
    background: #5a67d8;
}

#loginmessage {
    margin-top: 50px;
    font-size: 30px;
    color: #e53e3e;
}
#message {
    margin-top: 50px;
    font-size: 30px;
    color: #e53e3e;
}

.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-wrapper input {
    flex: 1;
    /* padding-right: 60px; */
}

.toggle-password {
    position: absolute;
    right: 20px;
    cursor: pointer;
    font-size: 28px;
    color: #666;
    user-select: none;
}

.toggle-password:hover {
    color: #0f65a7;
}

.login-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.login-content {
    background: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.login-content h2 {
    font-size: 46px;
    margin-bottom: 50px;
    color: #333;
}

.robot-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.robot-content {
    background: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.robot-content h2 {
    font-size: 46px;
    margin-bottom: 50px;
    color: #333;
}

.selectrobot-btn {
    background: #0f65a7;
    color: white;
    border: none;
    height: 70px;
    font-weight: 600;
    font-size: 32px;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.3s ease;
    width: 300px;
    margin: 20px;
}

.selectrobot-btn:hover {
    background: #5a67d8;
}