:root {
    --bg-color: #f5f7fa;
    --text-color: #2c3e50;
    --primary-color: #3498db;
    --secondary-color: #9b59b6;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --header-bg: #ffffff;
    --card-bg: #ffffff;
    --border-color: #dcdde1;
}

body {
    margin: 0;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--header-bg);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-bottom: 1px solid var(--border-color);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
}

header h1 a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
    text-decoration: none;
}

main {
    padding: 2rem 0;
    min-height: calc(100vh - 160px);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    color: #fff;
}

.btn:disabled {
    background-color: #dcdde1 !important;
    opacity: 0.7;
    cursor: not-allowed;
    filter: grayscale(1);
    transform: none !important;
}

.btn-primary { background-color: var(--primary-color); }
.btn-primary:not(:disabled):hover { background-color: #2980b9; transform: translateY(-2px); }

.btn-danger { background-color: var(--danger-color); font-size: 1.2rem; padding: 15px 30px; }
.btn-danger:not(:disabled):hover { background-color: #c0392b; transform: translateY(-2px); }

.btn-success { background-color: var(--success-color); }
.btn-success:not(:disabled):hover { background-color: #27ae60; transform: translateY(-2px); }

.btn-secondary { background-color: var(--secondary-color); }
.btn-secondary:not(:disabled):hover { background-color: #8e44ad; transform: translateY(-2px); }

/* Game Screens */
.screen {
    display: none;
    text-align: center;
}

.screen.active {
    display: block;
}

#question-text-area {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    margin: 20px 0;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

#question-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: #7f8c8d;
    font-weight: 500;
}

.text-highlight {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--danger-color);
}

/* Forms */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-color);
}

input[type="text"],
input[type="number"],
input[type="email"],
select,
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s;
    background-color: var(--card-bg);
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.form-actions {
    margin-top: 30px;
    display: flex;
    justify-content: flex-end;
    gap: 15px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.question-list {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card-bg);
}

.question-list th,
.question-list td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

.question-list th {
    background-color: #f8f9fa;
    font-weight: bold;
    color: var(--text-color);
}

.question-list tr:last-child td {
    border-bottom: none;
}

.question-list tr:hover {
    background-color: #f1f2f6;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 5px;
    margin: 30px 0;
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s;
    white-space: nowrap;
    min-width: 35px;
    box-sizing: border-box;
}

.pagination a:hover {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.pagination .current {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* Messages */
.message {
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 5px solid transparent;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    border-left-color: var(--success-color);
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border-left-color: var(--danger-color);
}

.message p {
    margin: 5px 0;
}

.actions {
    margin-top: 20px;
    text-align: center;
}

/* Search Box */
.search-box {
    margin-bottom: 30px;
    padding: 15px;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

.search-box + .table-responsive {
    margin-top: 30px;
}

.search-form {
    display: flex;
    gap: 10px;
    align-items: center;
}

.search-input {
    flex: 1;
}

@media (max-width: 600px) {
    .search-form {
        flex-direction: column;
        align-items: stretch;
    }
}

.static-value {
    padding: 12px;
    background-color: #e9ecef;
    border-radius: 6px;
    margin: 0;
    color: #495057;
}