/* ===== 左右布局：左侧为基准，右侧高度受限并可滚动 ===== */
.wm-layout {
    display: flex;
    gap: 12px;               /* 左右间距略小一点，更紧凑 */
    align-items: flex-start; /* 各自按内容高度，不再互相拉高 */
}

.wm-left {
    flex: 0 0 66.666%;
    max-width: 66.666%;
}

.wm-right {
    flex: 0 0 320px;         /* 桌面端右侧控制面板宽度 */
    max-width: 340px;
    min-width: 0;
    border-radius: 10px;
}

/* 右侧设置卡片：高度受限，内部滚动（具体 max-height 由 JS 根据左侧高度设置） */
.wm-right .watermark-settings {
    overflow-y: auto;
    overflow-x: hidden;
}

/* 小屏幕自适应：上下布局，右侧宽度 100%，高度自适应（不再限制） */
@media (max-width: 991px) {
    .wm-layout {
        flex-direction: column;
        align-items: stretch;
    }

    .wm-left,
    .wm-right {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .wm-right {
        border-radius: 0;
        margin-top: 12px;
    }

    .wm-right .watermark-settings {
        max-height: none !important;
        overflow-y: visible;
    }
}

.upload-wrapper {
    border: 2px dashed #ddd;
    border-radius: 8px;
    position: relative;
    transition: border-color 0.2s;
    cursor: pointer;
}

/* 仅在空状态下给出较大的拖拽区域，避免有图时出现大块留白 */
.upload-wrapper.is-empty {
    min-height: 460px;
}

.upload-wrapper:hover {
    border-color: #0d6efd;
}

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

.upload-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    width: 100%;
}

.upload-placeholder i {
    font-size: 48px;
    color: #0d6efd;
    margin-bottom: 10px;
}

.upload-tips {
    font-size: 12px;
    color: #999;
    margin-top: 10px;
}

.preview-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
}

.preview-container canvas {
    max-width: 100%;
    max-height: 100%;
}

.preview-container.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-container.loading::before {
    content: '加载中...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    color: #0d6efd;
}

#previewCanvas {
    display: block;
    max-width: 100%;
    max-height: 100%;
    margin: 0 auto;
}

/* 右侧设置区域 */
.watermark-settings {
    background: #fff;
    border-radius: 10px;
    padding: 18px 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

/* 选项卡 */
.watermark-settings .nav-tabs.wm-nav-tabs {
    border-bottom: 1px solid #eaedf0;
    margin-bottom: 18px;
    display: flex;
    gap: 0;
}

.watermark-settings .nav-tabs.wm-nav-tabs > li > a {
    padding: 9px 18px;
    color: #888;
    font-size: 14px;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    border-radius: 0;
    background: transparent;
    transition: color 0.2s;
    font-weight: 500;
}

.watermark-settings .nav-tabs.wm-nav-tabs > li > a:hover {
    color: #3b7df8;
    background: transparent;
    border-color: transparent;
}

.watermark-settings .nav-tabs.wm-nav-tabs > li.active > a,
.watermark-settings .nav-tabs.wm-nav-tabs > li.active > a:hover,
.watermark-settings .nav-tabs.wm-nav-tabs > li.active > a:focus {
    color: #3b7df8;
    font-weight: 600;
    background: transparent;
    border: none;
    border-bottom: 2px solid #3b7df8;
    outline: none;
}

.tab-content {
    padding-top: 4px;
}

/* form label 统一 */
.watermark-settings label {
    font-size: 13px;
    color: #606876;
    font-weight: 500;
    margin-bottom: 6px;
    display: block;
}

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

/* 输入框统一 */
.watermark-settings .form-control {
    border: 1px solid #e2e6ea;
    border-radius: 7px;
    font-size: 13px;
    color: #333;
    height: 36px;
    padding: 6px 10px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.watermark-settings .form-control:focus {
    border-color: #3b7df8;
    box-shadow: 0 0 0 3px rgba(59,125,248,0.12);
    outline: none;
}

/* range 滑块 + 数值并排 */
.wm-range-group {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 36px;
}

.wm-range-group input[type="range"] {
    flex: 1;
    padding: 0;
    margin: 0;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #3b7df8 0%, #3b7df8 var(--range-pct, 50%), #dde1e7 var(--range-pct, 50%), #dde1e7 100%);
    border-radius: 4px;
    cursor: pointer;
    outline: none;
    border: none;
}

.wm-range-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid #3b7df8;
    box-shadow: 0 1px 4px rgba(59,125,248,0.3);
    cursor: pointer;
    transition: transform 0.15s;
}

.wm-range-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.wm-range-group input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid #3b7df8;
    box-shadow: 0 1px 4px rgba(59,125,248,0.3);
    cursor: pointer;
}

.wm-range-val {
    flex: 0 0 auto;
    min-width: 42px;
    text-align: right;
    font-size: 12px;
    color: #888;
    background: #f4f6f9;
    border-radius: 5px;
    padding: 2px 7px;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

/* 颜色选择器 */
.wm-color-input {
    display: block;
    width: 48px;
    height: 36px;
    border: 1px solid #e2e6ea;
    border-radius: 7px;
    padding: 2px;
    cursor: pointer;
    background: none;
    overflow: hidden;
}

/* 图片水印上传样式 */
.watermark-image-upload {
    margin-top: 4px;
}

.wm-img-preview {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 72px;
}

.wm-img-placeholder {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1.5px dashed #d0d5dd;
    border-radius: 8px;
    color: #aaa;
    font-size: 13px;
    transition: border-color 0.2s, color 0.2s;
    background: #fafbfc;
}

.wm-img-placeholder:hover {
    border-color: #3b7df8;
    color: #3b7df8;
    background: #f0f5ff;
}

.wm-img-placeholder i {
    font-size: 18px;
}

#watermarkPreviewImg {
    max-width: 100%;
    max-height: 100px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 通用设置分隔 */
.common-settings {
    margin-top: 8px;
    padding-top: 14px;
    border-top: 1px solid #f0f2f5;
}

/* 平铺设置块 */
#tileSettings {
    background: #f8f9fb;
    padding: 14px;
    border-radius: 8px;
    margin-top: 8px;
    border: 1px solid #eaedf0;
}

/* checkbox 样式 — 不依赖 Bootstrap .checkbox 容器 */
.wm-checkbox-label {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 13px;
    color: #555;
    font-weight: 500;
    cursor: pointer;
    margin: 0;
    padding: 0;
    /* 覆盖 Bootstrap label 的默认 padding-left */
    padding-left: 0 !important;
}

.wm-checkbox-label input[type="checkbox"] {
    position: static !important;
    margin: 0 !important;
    width: 15px;
    height: 15px;
    flex-shrink: 0;
    cursor: pointer;
}

/* 下载按钮 */
.watermark-settings .btn-primary {
    background: linear-gradient(135deg, #3b7df8, #5b6cf9);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    padding: 9px;
    letter-spacing: 0.5px;
    box-shadow: 0 3px 10px rgba(59,125,248,0.3);
    transition: opacity 0.2s, box-shadow 0.2s;
}

.watermark-settings .btn-primary:hover {
    opacity: 0.92;
    box-shadow: 0 5px 14px rgba(59,125,248,0.4);
}

/* 介绍部分样式 */
.watermark-intro {
    padding: 20px 0;
}

.intro-section {
    margin-bottom: 40px;
}

.intro-section h3 {
    color: #333;
    font-size: 24px;
    margin-bottom: 25px;
    font-weight: 500;
}

.intro-section h3 i {
    color: #0d6efd;
    margin-right: 10px;
}

/* 场景网格 */
.scene-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.scene-item {
    background: #fff;
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.scene-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.scene-item i {
    font-size: 36px;
    color: #0d6efd;
    margin-bottom: 15px;
}

.scene-item h4 {
    color: #333;
    margin: 10px 0;
    font-size: 18px;
}

.scene-item p {
    color: #666;
    margin: 0;
}

/* 功能特点 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 25px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: #e7f1ff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
}

.feature-icon i {
    font-size: 24px;
    color: #0d6efd;
}

.feature-content h4 {
    margin: 0 0 8px 0;
    color: #333;
    font-size: 18px;
}

.feature-content p {
    margin: 0;
    color: #666;
    line-height: 1.5;
}

/* 使用步骤 */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.step {
    display: flex;
    align-items: flex-start;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.step-number {
    width: 36px;
    height: 36px;
    background: #0d6efd;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    margin-right: 15px;
}

.step-content h4 {
    margin: 0 0 8px 0;
    color: #333;
    font-size: 16px;
}

.step-content p {
    margin: 0;
    color: #666;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .scene-grid,
    .features-grid,
    .guide-steps {
        grid-template-columns: 1fr;
    }
    
    .intro-section {
        margin-bottom: 30px;
    }
}