/**
 * SCADA基础样式 - 重置、容器、通用工具类
 */

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", Arial, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.container {
    width: 95%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 视频背景容器 */
.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.video-poster {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("https://picsum.photos/1920/1080?water");
    background-size: cover;
    background-position: center;
    opacity: 1;
    transition: opacity 0.5s ease;
    z-index: 1;
}

.video-poster.hidden {
    opacity: 0;
    pointer-events: none;
}

.video-background video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: 2;
}

.video-background video.visible {
    opacity: 0.6;
}