body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* centerから変更(長い表に対応するため) */
    min-height: 100vh;
    margin: 0;
    padding-top: 40px; /* 上に余白 */
    padding-bottom: 40px;
}

.container {
    width: 100%;
    max-width: 700px; /* 少し幅を広げる */
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 20px;
    margin-bottom: 20px;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.progress-label {
    font-size: 0.85rem;
    color: #888;
}

.label {
    font-size: 0.85rem;
    color: #666;
    font-weight: bold;
}

.question-text {
    font-size: 1.2rem;
    margin-top: 0;
    margin-bottom: 20px;
    line-height: 1.6;
}

.input-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
    margin-top: 10px;
}

button:hover {
    background-color: #0056b3;
}

.secondary-btn {
    background-color: #6c757d;
}

.secondary-btn:hover {
    background-color: #5a6268;
}

.restart-btn {
    background-color: #28a745;
}
.restart-btn:hover {
    background-color: #218838;
}

.hidden {
    display: none;
}

/* バッジ */
.badge {
    background-color: #dc3545;
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    vertical-align: middle;
    margin-left: 5px;
}

/* 結果詳細 */
.color-preview {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 20px;
    border: 3px solid #eee;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.result-details p {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid #eee;
    padding: 8px 0;
    margin: 0;
}

.result-details p strong {
    min-width: 100px;
    color: #555;
}

.result-details p span {
    text-align: right;
    flex: 1;
}

.correct-mark { color: #28a745; font-weight: bold; margin-left: 10px; }
.incorrect-mark { color: #dc3545; font-weight: bold; margin-left: 10px; }
.correct { color: #28a745; }
.incorrect { color: #dc3545; }

/* 総合結果テーブル */
.table-wrapper {
    overflow-x: auto;
    margin-bottom: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
    font-weight: bold;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

.status-ok { color: #28a745; font-weight: bold; text-align: center; }
.status-ng { color: #dc3545; font-weight: bold; text-align: center; }

.dataset-selector {
    background-color: #e9ecef;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: left;
}

.dataset-selector label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: #555;
}

.dataset-selector select {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: white;
    cursor: pointer;
}

/* スマホ等でセレクトボックスが押しやすいように調整 */
@media (min-width: 600px) {
    .dataset-selector {
        display: flex;
        align-items: center;
        gap: 15px;
    }
    .dataset-selector label {
        margin-bottom: 0;
        white-space: nowrap;
    }
}