* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 20px;
    background: linear-gradient(135deg, #E8E5D8 0%, #F5F3ED 50%, #E8E5D8 100%);
    min-height: 100vh;
    font-family: -apple-system, "Segoe UI", "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
}

#container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 50px 45px;
    border-radius: 8px;
    background-color: #FAF9F6;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 
                0 1px 3px rgba(0, 0, 0, 0.05),
                inset 0 1px 0 rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

h1 { 
    margin: 0 0 10px 0; 
    text-align: center;
    font-size: 28px;
    font-weight: 400;
    color: #2C2C2C;
    letter-spacing: 0.5px;
}

article { 
    font-size: 14px; 
    color: #6B6B6B;
    line-height: 1.8;
    text-align: center;
    padding: 15px 0;
    margin-bottom: 30px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.control-section {
    margin-bottom: 30px;
    text-align: center;
}

.file-label {
    display: block;
    color: #3A3A3A;
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
}

#import-btn {
    padding: 12px 24px;
    font-size: 15px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: 4px;
    background-color: #FFFFFF;
    color: #2C2C2C;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    max-width: 100%;
    width: auto;
    box-sizing: border-box;
}

#import-btn:hover {
    border-color: #8B7355;
    box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.1);
}

#import-btn:focus {
    outline: none;
    border-color: #8B7355;
    box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.1);
}

.images-container {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
    min-height: 400px;
    gap: 2px;
    background-color: rgba(0, 0, 0, 0.05);
    padding: 2px;
    border-radius: 4px;
}

.image-container {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background-color: #FFFFFF;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.image-container.dragging {
    cursor: grabbing;
}

.image-container img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.1s ease-out;
    pointer-events: none;
}

/* 2张图片布局 */
.images-container.layout-2 {
    flex-direction: row;
    height: 600px;
}

.images-container.layout-2.portrait {
    flex-direction: column;
}

.images-container.layout-2 .image-container {
    width: calc(50% - 1px);
    height: 100%;
}

.images-container.layout-2.portrait .image-container {
    width: 100%;
    height: calc(50% - 1px);
}

/* 3张图片布局 */
.images-container.layout-3 {
    flex-direction: row;
    height: 600px;
}

.images-container.layout-3.portrait {
    flex-direction: column;
}

.images-container.layout-3 .image-container {
    width: calc(33.333% - 2px);
    height: 100%;
}

.images-container.layout-3.portrait .image-container {
    width: 100%;
    height: calc(33.333% - 2px);
}

/* 4张图片布局（四宫格） */
.images-container.layout-4 {
    height: 800px;
}

.images-container.layout-4 .image-container {
    width: calc(50% - 1px);
    height: calc(50% - 1px);
}

footer {
    margin-top: 40px;
    padding: 20px 0;
    text-align: center;
}

footer a {
    opacity: 0.6;
    transition: opacity 0.2s;
}

footer a:hover {
    opacity: 0.8;
}

footer img {
    filter: grayscale(100%);
    transition: filter 0.2s;
}

footer a:hover img {
    filter: grayscale(0%);
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    #container {
        padding: 30px 20px;
    }
    
    #import-btn {
        width: 100%;
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .images-container.layout-2,
    .images-container.layout-3 {
        height: auto;
        min-height: 400px;
    }
    
    .images-container.layout-2 .image-container,
    .images-container.layout-3 .image-container {
        width: 100%;
        height: 300px;
    }
    
    /* 4张图片在窄屏时也保持四宫格布局 */
    .images-container.layout-4 {
        height: 600px;
    }
    
    .images-container.layout-4 .image-container {
        width: calc(50% - 1px);
        height: calc(50% - 1px);
    }
}