:root{
  --bg:#0f1724;
  --glass-bg: rgba(255,255,255,0.03);
  --accent: #7dd3fc;
  --muted: #9ca3af;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;
  background: linear-gradient(180deg,#071025 0%, #0b1321 100%);
  color:#e6eef8;
  min-height:100vh;
  display:flex;
  align-items:stretch;
  justify-content:center;
  padding:24px;
}
.app{
  width:100%;
  max-width:1200px;
  height:calc(100vh - 48px);
  display:flex;
  flex-direction:column;
  gap:12px;
  border-radius:14px;
  overflow:hidden;
  background: radial-gradient(800px 400px at 10% 10%, rgba(125,211,252,0.04), transparent 10%), rgba(6,10,18,0.6);
  box-shadow: 0 8px 30px rgba(2,6,23,0.7);
}
/* topbar */
.topbar{
  height:64px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 18px;
  backdrop-filter: blur(6px);
  border-bottom:1px solid rgba(255,255,255,0.03);
}
.brand{display:flex;gap:12px;align-items:center}
.logo{
  width:40px;height:40px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent),#60a5fa);
  display:flex;align-items:center;justify-content:center;font-weight:700;color:#042a35;
}
.title{font-weight:600}
.btn{background:transparent;border:1px solid rgba(255,255,255,0.06);padding:8px 12px;border-radius:8px;color:var(--muted);cursor:pointer}
.btn:hover{border-color:rgba(125,211,252,0.3);color:var(--accent)}
.big{padding:10px 16px}

/* main area */
.main{flex:1;display:flex;gap:12px;padding:12px}
.stage{
  flex:1;
  background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
  border-radius:12px;
  padding:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  position:relative;
  overflow:auto;
}
.empty-state{ text-align:center; color:var(--muted); max-width:680px}
.join-controls{display:flex;gap:8px;align-items:center;justify-content:center;margin-top:12px}
.sidebar{width:320px;display:flex;flex-direction:column;gap:12px}
.panel{background:var(--glass-bg);border-radius:12px;padding:8px;backdrop-filter: blur(6px);border:1px solid rgba(255,255,255,0.03)}
.chat{flex:1;display:flex;flex-direction:column;min-height:220px}
.messages{height:220px;overflow:auto;padding:8px;display:flex;flex-direction:column;gap:8px}
.chat-input{display:flex;gap:8px;margin-top:8px}
.chat-input input{flex:1;padding:8px;border-radius:8px;border:1px solid rgba(255,255,255,0.03);background:transparent;color:inherit}
.participants ul{list-style:none;padding:0;margin:8px 0;max-height:180px;overflow:auto}
.p-actions{display:flex;gap:8px;justify-content:space-between;margin-top:8px}

/* footer */
.footer{height:72px;display:flex;align-items:center;justify-content:center;padding:8px;border-top:1px solid rgba(255,255,255,0.03)}
.controls-bottom{display:flex;gap:12px;align-items:center}
.circle{width:52px;height:52px;border-radius:50%;border:1px solid rgba(255,255,255,0.04);display:flex;align-items:center;justify-content:center;font-size:20px;background:transparent;cursor:pointer}
.danger{background:linear-gradient(90deg,#ef4444,#f97316);border:none;padding:10px 18px;border-radius:10px;color:#041014;}

/* video tiles */
.tile{
  width:320px;height:200px;border-radius:10px;overflow:hidden;border:1px solid rgba(255,255,255,0.04);
  background:rgba(0,0,0,0.3);position:relative;margin:8px;
  display:flex;flex-direction:column;
}
.tile video{width:100%;height:100%;object-fit:cover}
.tile .meta{position:absolute;left:8px;bottom:8px;background:rgba(0,0,0,0.45);padding:6px 8px;border-radius:8px;font-size:13px}
.grid{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:center;padding:8px}

/* modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(1,2,6,0.5)}
.hidden{display:none}
.modal-content{width:420px;padding:18px;border-radius:12px}
.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:12px}

/* responsive */
@media(max-width:900px){
  .sidebar{display:none}
  .stage{padding:6px}
  .tile{width:46vw;height:28vh}
}