*{box-sizing:border-box;margin:0;padding:0}
html,body,#viewer{height:100%;width:100%}
body{font-family:Arial,Helvetica,sans-serif;color:#222}
.header{background:#0b2b3a;color:#fff;padding:16px 24px;display:flex;align-items:center}
.header .logo{font-weight:700;font-size:18px}
.viewer-wrap{height:calc(100% - 64px);background:#000}
.viewer-wrap iframe{width:100%;height:100%;border:none}
.footer{position:fixed;right:12px;bottom:12px;background:rgba(255,255,255,0.9);padding:6px 10px;border-radius:6px;font-size:12px;color:#000}