* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    /* 核心：保持透明，让 MindAR 自动生成的底层摄像头画面透出来 */
    background-color: transparent; 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* 保证 A-Frame 渲染层不遮挡现实世界 */
.a-canvas {
    background-color: transparent !important;
}

#ui-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none; 
}

#scanning-overlay {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 识别成功后隐藏扫描遮罩 */
#scanning-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.scan-frame {
    width: 60vw;
    height: 60vw;
    max-width: 280px;
    max-height: 280px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 24px;
    position: relative;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    overflow: hidden;
}

.scan-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, transparent, #fff, transparent);
    animation: scan 2.5s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes scan {
    0% { top: 0%; opacity: 0; }
    15% { opacity: 1; }
    85% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

p {
    color: #ffffff;
    margin-top: 32px;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
}