:root{color-scheme:dark}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#0b0b0b;color:#f2f2f2}
.viewer{height:100%;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border-bottom:1px solid rgba(255,255,255,0.08);background:rgba(0,0,0,0.35);backdrop-filter:saturate(140%) blur(6px)}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand .title{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand .meta{font-size:12px;opacity:0.7}
.controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
button{appearance:none;border:1px solid rgba(255,255,255,0.16);background:rgba(255,255,255,0.06);color:#f2f2f2;padding:8px 10px;border-radius:10px;cursor:pointer;line-height:1}
button:hover{background:rgba(255,255,255,0.10)}
button:active{transform:translateY(1px)}
button:disabled{opacity:0.45;cursor:not-allowed}
.main{position:relative;flex:1;display:flex;align-items:center;justify-content:center;overflow:hidden}
.slide-img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}
.hint{position:absolute;left:12px;bottom:12px;font-size:12px;opacity:0.65;background:rgba(0,0,0,0.35);padding:6px 8px;border-radius:10px;border:1px solid rgba(255,255,255,0.10)}
@media (max-width:640px){
  .brand .meta{display:none}
  button{padding:10px 12px}
}