.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: #6b7280;
    margin-bottom: 0;
    line-height: 1.6;
}

.watermark-upload-area {
    border: 2px dashed #dee2e6;
    border-radius: 4px;
    padding: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.watermark-upload-area:hover {
    border-color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.05);
}

.watermark-upload-area.dragover {
    border-color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.1);
}

.watermark-settings {
    background-color: #f8f9fa;
    border-radius: 4px;
    padding: 1rem;
}

.watermark-settings .form-label {
    font-weight: 500;
    color: #495057;
}

.watermark-preview {
    position: relative;
    min-height: 300px;
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    overflow: hidden;
}

.watermark-preview img {
    max-width: 100%;
    height: auto;
}

.preview-box {
    min-height: 300px;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f8f9fa;
    border-radius: 0.25rem;
}

.preview-box img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
}

.selected-images-list {
    max-height: 400px;
    overflow-y: auto;
    margin-top: 1rem;
}

.image-item {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    margin-bottom: 0.5rem;
    background-color: #fff;
}

.image-item:hover {
    background-color: #f8f9fa;
}

.image-item img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 4px;
    margin-right: 1rem;
}

.image-item .image-info {
    flex-grow: 1;
}

.image-item .image-name {
    margin: 0;
    font-size: 0.9rem;
    color: #212529;
}

.image-item .image-size {
    margin: 0;
    font-size: 0.8rem;
    color: #6c757d;
}

/* 使用说明样式 */
.alert-info {
    background-color: rgba(13, 110, 253, 0.05);
    border-color: rgba(13, 110, 253, 0.1);
}

.alert-info .alert-heading {
    color: #0d6efd;
}

.alert-info hr {
    border-top-color: rgba(13, 110, 253, 0.1);
}

.alert ul {
    margin-bottom: 0;
}

.alert li {
    line-height: 1.5;
}

.alert li.text-primary {
    color: #0d6efd;
}

/* 平铺设置样式 */
#tileSettings {
    transition: all 0.3s ease;
}

#tileSettings.d-none {
    display: none !important;
}

/* 密度值显示样式 */
#densityValue {
    font-size: 0.875rem;
    color: #6c757d;
}

/* 添加提示框样式 */
#debugInfo {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1050;
    min-width: 300px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    border: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#debugInfo.show {
    opacity: 1;
}

#debugInfo .message {
    display: inline-block;
    margin-right: 1rem;
}

#debugInfo .btn-close {
    padding: 0.5rem;
}