/* 表单样式 */
.form-control {
    border-radius: var(--border-radius);
    border: 2px solid var(--gray-200);
    /* 收紧输入框内边距 */
    padding: 8px 12px;
    font-size: 14px;
    transition: all var(--transition-speed);
    background-color: white;
    color: var(--text-color);
    line-height: 1.5;
    width: 100%;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    outline: none;
}

.form-control:disabled,
.form-control[readonly] {
    background-color: var(--gray-100);
    color: var(--gray-600);
    border-color: var(--gray-200);
    opacity: 1;
}

.form-control::placeholder {
    color: var(--gray-400);
}

/* 表单选择框 */
.form-select {
    border-radius: var(--border-radius);
    border: 2px solid var(--gray-200);
    /* 收紧选择器内边距 */
    padding: 8px 12px;
    font-size: 14px;
    transition: all var(--transition-speed);
    background-color: white;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 6 7 7 7-7'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    appearance: none;
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    outline: none;
}

/* 表单标签 */
.form-label {
    font-weight: 600;
    color: var(--gray-700);
    /* 收紧标签与控件间距 */
    margin-bottom: 6px;
    font-size: 14px;
    display: block;
}

.form-label.required::after {
    content: " *";
    color: var(--danger-color);
}

/* 表单文本 */
.form-text {
    margin-top: 4px;
    font-size: 12px;
    color: var(--gray-500);
}

/* 输入组 */
.input-group {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.input-group .form-control {
    position: relative;
    flex: 1 1 auto;
    width: 1%;
    min-width: 0;
    border-radius: 0;
    margin: 0;
}

.input-group .form-control:first-child {
    border-top-left-radius: var(--border-radius);
    border-bottom-left-radius: var(--border-radius);
}

.input-group .form-control:last-child {
    border-top-right-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
}

.input-group .btn {
    position: relative;
    z-index: 2;
    border-radius: 0;
    border-left: none;
}

.input-group .btn:first-child {
    border-top-left-radius: var(--border-radius);
    border-bottom-left-radius: var(--border-radius);
    border-left: 1px solid;
}

.input-group .btn:last-child {
    border-top-right-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--gray-600);
    text-align: center;
    white-space: nowrap;
    background-color: var(--gray-100);
    border: 2px solid var(--gray-200);
}

/* 表单验证 */
.form-control.is-valid {
    border-color: var(--success-color);
}

.form-control.is-valid:focus {
    border-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
}

.form-control.is-invalid:focus {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.valid-feedback {
    display: none;
    width: 100%;
    margin-top: 4px;
    font-size: 12px;
    color: var(--success-color);
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 4px;
    font-size: 12px;
    color: var(--danger-color);
}

.form-control.is-valid ~ .valid-feedback,
.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

/* 复选框和单选框 */
.form-check {
    display: block;
    min-height: 1.5rem;
    padding-left: 1.5rem;
    margin-bottom: 0.125rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin-top: 0.25rem;
    margin-left: -1.5rem;
    vertical-align: top;
    background-color: white;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: 1px solid rgba(0, 0, 0, 0.25);
    appearance: none;
    color-adjust: exact;
    transition: all var(--transition-speed);
}

.form-check-input[type="checkbox"] {
    border-radius: 0.25em;
}

.form-check-input[type="radio"] {
    border-radius: 50%;
}

.form-check-input:active {
    filter: brightness(90%);
}

.form-check-input:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.25);
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-input:checked[type="checkbox"] {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/%3e%3c/svg%3e");
}

.form-check-input:checked[type="radio"] {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='2' fill='%23fff'/%3e%3c/svg%3e");
}

.form-check-label {
    color: var(--text-color);
    cursor: pointer;
}

/* 开关样式 */
.form-switch {
    padding-left: 2.5rem;
}

.form-switch .form-check-input {
    width: 2rem;
    margin-left: -2.5rem;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='rgba%280, 0, 0, 0.25%29'/%3e%3c/svg%3e");
    background-position: left center;
    border-radius: 2rem;
    transition: background-position var(--transition-speed);
}

.form-switch .form-check-input:focus {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%2386b7fe'/%3e%3c/svg%3e");
}

.form-switch .form-check-input:checked {
    background-position: right center;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e");
}

/* 搜索表单 */
.search-form {
    display: flex;
    gap: 12px;
    /* 工具栏/搜索区更紧凑 */
    margin-bottom: 12px;
    align-items: center;
    flex-wrap: wrap;
}

/* 后台风格：宽屏下将搜索/筛选区布局为多列网格，提升每行元素数量 */
@media (min-width: 992px) {
    .search-form {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, max-content));
        column-gap: 12px;
        row-gap: 8px;
        align-items: end;
    }

    .search-form .form-control,
    .search-form .form-select {
        width: 100%;
    }

    .search-form .btn {
        width: max-content;
    }
}

.search-form .form-control {
    flex: 1;
    min-width: 200px;
}

.search-form .btn {
    flex-shrink: 0;
}

/* 表单行 */
.form-row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -5px;
    margin-left: -5px;
}

.form-row .col,
.form-row [class*="col-"] {
    padding-right: 5px;
    padding-left: 5px;
}

/* 文件上传区域 */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--border-radius);
    background-color: var(--gray-50);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(59, 130, 246, 0.02);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(59, 130, 246, 0.05);
}

.upload-icon {
    margin-bottom: 16px;
}

.upload-text {
    color: var(--gray-600);
    font-size: 14px;
}

.upload-text p {
    margin-bottom: 12px;
    font-size: 16px;
}

/* 格式信息区域 */
.format-info {
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-top: 8px;
}

.format-info .table {
    margin-bottom: 8px;
    font-size: 13px;
}

.format-info .table th {
    background-color: var(--gray-100);
    border: 1px solid var(--gray-300);
    font-weight: 600;
    font-size: 12px;
    padding: 8px;
    text-align: center;
}

.format-info .table td {
    border: 1px solid var(--gray-300);
    padding: 8px;
    text-align: center;
}

/* 导入统计样式 */
.import-stats {
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    padding: 20px;
    margin: 16px 0;
}

.import-stats .stat-number {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 4px;
}

.import-stats .stat-label {
    font-size: 12px;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.error-list {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--border-radius);
    padding: 12px;
    max-height: 200px;
    overflow-y: auto;
}

/* 图书信息卡片 */
.book-info-card {
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 16px;
    margin: 12px 0;
}

.book-info-card h6 {
    color: var(--gray-900);
    font-weight: 600;
    margin-bottom: 4px;
}

.book-info-card .text-muted {
    color: var(--gray-600);
    font-size: 14px;
}

.book-info-card small {
    font-size: 12px;
    color: var(--gray-500);
}