/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

/* 头部样式 */
.site-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    color: #333;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

/* 主容器样式 */
.wallpaper-container {
    max-width: 1440px;
    margin: 80px auto 2rem;
    padding: 0 1rem;
}

/* 壁纸网格布局 */
.wallpaper-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

/* 壁纸卡片样式 */
.wallpaper-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.wallpaper-card:hover {
    transform: translateY(-5px);
}

.wallpaper-cover {
    position: relative;
    padding-top: 56.25%; /* 16:9 比例 */
    overflow: hidden;
}

.wallpaper-cover img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 壁纸操作按钮 */
.wallpaper-actions {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.wallpaper-cover:hover .wallpaper-actions {
    opacity: 1;
}

.preview-btn,
.download-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 4px;
    background: #fff;
    color: #333;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.preview-btn:hover,
.download-btn:hover {
    background: #f0f0f0;
}

/* 壁纸标题 */
.wallpaper-title {
    padding: 1rem;
    font-size: 1rem;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 预览模态框 */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.modal-content video {
    max-width: 100%;
    max-height: 90vh;
}

.close-modal {
    position: absolute;
    top: -40px;
    right: 0;
    padding: 0.5rem 1rem;
    background: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .wallpaper-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1rem;
    }

    .preview-btn,
    .download-btn {
        padding: 0.4rem 1rem;
        font-size: 0.9rem;
    }
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 2rem;
    font-size: 1.2rem;
    color: #666;
}

/* 无限滚动提示 */
.infinite-scroll-status {
    text-align: center;
    padding: 1rem;
    color: #666;
}

/* 添加返回按钮样式 */
.back-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.2rem;
    background: #f0f0f0;
    color: #333;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
}

.back-btn:before {
    content: "←";
    margin-right: 8px;
    font-size: 1.1rem;
}

.back-btn:hover {
    background: #e0e0e0;
    transform: translateX(-3px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}