/* =====================
   Background Remover - Styles
   BG Remover功能样式
   ===================== */

/* ===== 棋盘格背景（透明区域显示） ===== */
.preview-container--checkerboard {
    background-image:
        linear-gradient(45deg, #e0e0e0 25%, transparent 25%),
        linear-gradient(-45deg, #e0e0e0 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e0e0e0 75%),
        linear-gradient(-45deg, transparent 75%, #e0e0e0 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    background-color: #f5f5f5;
}

/* ===== 主预览区域 ===== */
.preview-section--main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 400px;
}

.preview-section--main .preview-container {
    flex: 1;
    min-height: 300px;
}

/* ===== 预览信息 ===== */
.preview-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ===== 模式导航 - 垂直方向 ===== */
.mode-nav--vertical {
    flex-direction: column;
    border-bottom: none;
    gap: 0.5rem;
    padding: 0.5rem;
}

.mode-nav--vertical .mode-nav__btn {
    justify-content: flex-start;
    padding: 0.75rem 1rem;
    border: 3px solid var(--pixel-border);
    border-radius: calc(var(--pixel-card-radius) - var(--pixel-card-border-offset));
    margin-bottom: 0;
    background: var(--pixel-card-bg);
}

.mode-nav--vertical .mode-nav__btn:hover {
    border-color: var(--pixel-primary);
}

.mode-nav--vertical .mode-nav__btn:hover::before {
    opacity: 1;
    background: rgba(154, 104, 101, 0.1);
}

.mode-nav--vertical .mode-nav__btn--active {
    border-color: var(--pixel-primary);
    box-shadow: var(--pixel-shadow-sm);
}

.mode-nav--vertical .mode-nav__btn--active::before {
    opacity: 1;
    background: rgba(154, 104, 101, 0.15);
}

/* ===== 颜色目标选择器 ===== */
.color-target-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.color-preview {
    width: 32px;
    height: 32px;
    border: 3px solid var(--pixel-border);
    border-radius: var(--pixel-radius-sm);
    cursor: pointer;
    transition: all var(--pixel-transition);
    box-shadow: inset 0 0 0 2px white;
}

.color-preview:hover {
    border-color: var(--pixel-primary);
    transform: scale(1.05);
}

/* ===== 颜色选择器内联 ===== */
.color-picker-inline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.color-input-native {
    width: 40px;
    height: 36px;
    border: 3px solid var(--pixel-border);
    border-radius: var(--pixel-radius-sm);
    cursor: pointer;
    padding: 2px;
    background: var(--pixel-card-bg);
}

.color-input-native::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-input-native::-webkit-color-swatch {
    border: none;
    border-radius: 2px;
}

.control-group__input--small {
    width: 80px;
    padding: 0.5rem 0.75rem;
    text-transform: uppercase;
    font-family: monospace;
}

/* ===== 预设颜色 ===== */
.preset-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: 0.5rem;
}

.preset-color {
    width: 28px;
    height: 28px;
    border: 3px solid var(--pixel-border);
    border-radius: var(--pixel-radius-sm);
    cursor: pointer;
    transition: all var(--pixel-transition);
    box-shadow: inset 0 0 0 2px white;
}

.preset-color:hover {
    border-color: var(--pixel-primary);
    transform: scale(1.1);
}

.preset-color[data-color="#ffffff"] {
    box-shadow: inset 0 0 0 2px #ccc;
}

/* ===== 画笔模式切换 ===== */
.brush-mode-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.brush-mode-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--pixel-card-bg);
    border: 3px solid var(--pixel-border);
    border-radius: var(--pixel-radius-md);
    cursor: pointer;
    transition: all var(--pixel-transition);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--pixel-text-secondary);
}

.brush-mode-btn:hover {
    border-color: var(--pixel-primary);
    background: rgba(255, 107, 53, 0.05);
}

.brush-mode-btn--active {
    border-color: var(--pixel-primary);
    background: rgba(255, 107, 53, 0.1);
    color: var(--pixel-primary);
    box-shadow: var(--pixel-shadow-sm);
}

.brush-mode-btn svg {
    flex-shrink: 0;
}

/* ===== 按钮组紧凑 ===== */
.btn-group--tight {
    display: flex;
    gap: 0.375rem;
}

/* ===== 缩略图栏 ===== */
.thumbnail-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--pixel-card-bg);
    border-radius: var(--pixel-card-radius);
    box-shadow: var(--pixel-card-shadow);
    border: 4px solid transparent;
    position: relative;
    overflow-x: auto;
    min-height: 80px;
}

.thumbnail-bar::before {
    content: '';
    position: absolute;
    inset: 8px;
    border: 3px dashed var(--pixel-card-border-dashed);
    border-radius: calc(var(--pixel-card-radius) - 8px);
    pointer-events: none;
    z-index: 1;
}

.thumbnail-list {
    display: flex;
    gap: 0.5rem;
    flex: 1;
    overflow-x: auto;
    padding: 0.25rem;
}

.thumbnail-item {
    position: relative;
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    background: var(--pixel-card-bg);
    border: 3px solid var(--pixel-border);
    border-radius: var(--pixel-radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--pixel-transition);
}

.thumbnail-item:hover {
    border-color: var(--pixel-primary);
    transform: translateY(-2px);
    box-shadow: var(--pixel-shadow-sm);
}

.thumbnail-item--active {
    border-color: var(--pixel-primary);
    box-shadow: var(--pixel-shadow-md);
}

.thumbnail-item--processed {
    border-color: var(--pixel-success);
}

.thumbnail-item canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.thumbnail-item__status {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--pixel-border);
    border: 2px solid white;
}

.thumbnail-item--processed .thumbnail-item__status {
    background: var(--pixel-success);
}

.thumbnail-item__remove {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--pixel-error);
    color: white;
    border: 2px solid white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--pixel-transition);
    font-size: 12px;
    line-height: 1;
}

.thumbnail-item:hover .thumbnail-item__remove {
    opacity: 1;
}

.thumbnail-item__remove:hover {
    background: #dc2626;
}

/* ===== 添加更多按钮 ===== */
.thumbnail-add-btn {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
    background: var(--pixel-card-bg);
    border: 3px dashed var(--pixel-border-dashed);
    border-radius: var(--pixel-radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--pixel-transition);
    color: var(--pixel-text-muted);
}

.thumbnail-add-btn:hover {
    border-color: var(--pixel-primary);
    color: var(--pixel-primary);
    background: rgba(255, 107, 53, 0.05);
}

.thumbnail-add-btn svg {
    width: 24px;
    height: 24px;
}

/* ===== 覆盖层Canvas ===== */
.overlay-canvas {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

/* ===== 取色器放大镜 ===== */
.color-picker-magnifier {
    position: fixed;
    width: 110px;
    height: 110px;
    background: var(--pixel-card-bg);
    border: 3px solid var(--pixel-border);
    border-radius: var(--pixel-radius-md);
    box-shadow: var(--pixel-shadow-lg);
    pointer-events: none;
    z-index: 1000;
    overflow: hidden;
}

.color-picker-magnifier canvas {
    width: 100%;
    height: 100%;
}

.magnifier-crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    transform: translate(-50%, -50%);
    border: 2px solid var(--pixel-primary);
    border-radius: 50%;
    pointer-events: none;
}

.magnifier-crosshair::before,
.magnifier-crosshair::after {
    content: '';
    position: absolute;
    background: var(--pixel-primary);
}

.magnifier-crosshair::before {
    width: 1px;
    height: 100%;
    left: 50%;
    transform: translateX(-50%);
}

.magnifier-crosshair::after {
    height: 1px;
    width: 100%;
    top: 50%;
    transform: translateY(-50%);
}

/* ===== 画笔光标 ===== */
.preview-wrapper.brush-mode {
    cursor: crosshair;
}

/* ===== 响应式调整 ===== */
@media (max-width: 768px) {
    .preview-section--main {
        min-height: 300px;
    }

    .thumbnail-bar {
        flex-wrap: wrap;
    }

    .thumbnail-list {
        order: 1;
        width: 100%;
    }

    .thumbnail-add-btn {
        order: 2;
        width: 100%;
        height: 40px;
    }

    .color-target-selector {
        flex-wrap: wrap;
    }

    .brush-mode-toggle {
        flex-direction: column;
    }
}

/* ===== 大屏幕响应式调整 ===== */
/* 1440p显示器 (1440px - 2559px) */
@media (min-width: 1440px) {
    .preview-section--main {
        min-height: 500px;
    }

    .thumbnail-item {
        width: 70px;
        height: 70px;
    }

    .thumbnail-add-btn {
        width: 70px;
        height: 70px;
    }
}

/* 2K显示器 (2560px - 3839px) */
@media (min-width: 2560px) {
    .preview-section--main {
        min-height: 600px;
    }

    .thumbnail-item {
        width: 80px;
        height: 80px;
    }

    .thumbnail-add-btn {
        width: 80px;
        height: 80px;
    }
}

/* 4K显示器 (3840px及以上) */
@media (min-width: 3840px) {
    .preview-section--main {
        min-height: 800px;
    }

    .thumbnail-item {
        width: 100px;
        height: 100px;
    }

    .thumbnail-add-btn {
        width: 100px;
        height: 100px;
    }
}