/* 共通変数 */
:root {
    --hover-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
    --border-radius: 6px;
    --transition-speed: 0.3s;
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    color: white;
}

.btn i {
    font-size: 16px;
}

/* ボタンバリエーション */
.btn-primary {
    background-color: var(--primary-color);
}
.btn-primary:hover {
    background-color: #1d4ed8;
}

.btn-secondary {
    background-color: var(--secondary-color);
}
.btn-secondary:hover {
    background-color: #4b5563;
}

.btn-danger {
    background-color: var(--error-color);
}
.btn-danger:hover {
    background-color: #dc2626;
}

.btn-outline-secondary {
    background-color: white;
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
}
.btn-outline-secondary:hover {
    background-color: var(--secondary-color);
    color: white;
}

/* フォーム */
.form-control {
    display: block;
    width: 100%;
    padding: 8px 12px;
    font-size: 16px;
    line-height: 1.5;
    color: #1f2937;
    background-color: white;
    background-clip: padding-box;
    border: 1px solid #e5e7eb;
    border-radius: var(--border-radius);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: var(--hover-shadow);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: inline-block;
    margin-bottom: 8px;
}

.required {
    color: var(--error-color);
    margin-left: 4px;
}

/* アラート */
.alert {
    padding: 16px;
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
}

.alert i {
    margin-right: 8px;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
}

/* テーブル */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    margin-bottom: 16px;
    background-color: white;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px;
    border: 1px solid #e5e7eb;
}

.table th {
    font-weight: 600;
    text-align: left;
    background-color: #f8fafc;
}

.table-hover tbody tr:hover {
    background-color: #f8fafc;
}

/* ページネーション */
.pagination {
    display: flex;
    padding-left: 0;
    list-style: none;
    justify-content: center;
    gap: 4px;
}

.page-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px;
    color: var(--primary-color);
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
}

.page-link:hover {
    background-color: #f3f4f6;
}

.page-item.active .page-link {
    background-color: var(--primary-color);
    color: white;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .btn {
        padding: 6px 12px;
        font-size: 14px;
    }

    .table th,
    .table td {
        padding: 8px;
    }
}