:root{
  --bg:#000;
  --ink:#e8e8e8;
  --dim:#7a7a7a;
  --line:#1e1e1e;
  --accent:#3ddc84;
  --busy:#3a3a3a;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:var(--bg); color:var(--ink);
  font:15px/1.5 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}

/* ---------- slot grid ---------- */
.wrap{max-width:900px;margin:0 auto;padding:64px 24px}
.wrap.center{display:flex;min-height:100vh;align-items:center;justify-content:center}
header{margin-bottom:40px}
h1{font-size:28px;font-weight:600;letter-spacing:-.02em}
.sub{color:var(--dim);font-size:14px;margin-top:6px}

.grid{
  display:grid;gap:12px;
  grid-template-columns:repeat(auto-fill,minmax(140px,1fr));
}
.slot{
  border:1px solid var(--line);border-radius:10px;
  padding:22px 18px;display:flex;flex-direction:column;gap:6px;
  background:#0a0a0a;transition:border-color .15s,background .15s,transform .08s;
}
.slot .num{font-size:22px;font-weight:600;letter-spacing:-.02em}
.slot .state{font-size:12px;color:var(--dim);text-transform:lowercase}
.slot.open:hover{border-color:var(--accent);background:#0d120f;transform:translateY(-1px)}
.slot.open .state{color:var(--accent)}
.slot.busy{opacity:.45;cursor:not-allowed}
.slot.busy:hover{transform:none;border-color:var(--line)}

.card{
  border:1px solid var(--line);border-radius:12px;background:#0a0a0a;
  padding:32px;max-width:420px;text-align:center
}
.card h2{font-size:18px;font-weight:600;margin-bottom:10px}
.card p{color:var(--dim);font-size:14px;margin-bottom:22px}
.btn{
  display:inline-block;border:1px solid var(--line);border-radius:8px;
  padding:9px 18px;font-size:14px;transition:border-color .15s
}
.btn:hover{border-color:var(--accent)}

/* ---------- session ---------- */
.session{
  height:100vh;display:flex;flex-direction:column;
  padding:10px;gap:10px;background:var(--bg)
}
.stage{
  flex:1;position:relative;min-height:0;
  border:1px solid #2a2a2a;border-radius:6px;overflow:hidden;background:#000
}
.screen{width:100%;height:100%;border:0;display:block;background:#000}

.overlay{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:16px;
  background:#000;color:var(--dim);font-size:14px;transition:opacity .3s
}
.overlay.hidden{opacity:0;pointer-events:none}
.spinner{
  width:22px;height:22px;border:2px solid #222;border-top-color:var(--accent);
  border-radius:50%;animation:spin .8s linear infinite
}
@keyframes spin{to{transform:rotate(360deg)}}

.drop{
  flex:0 0 58px;border:1px dashed #2a2a2a;border-radius:6px;
  display:flex;align-items:center;justify-content:center;gap:14px;
  color:var(--dim);font-size:13px;cursor:pointer;
  transition:border-color .15s,background .15s
}
.drop:hover,.drop.over{border-color:var(--accent);background:#0a0f0c;color:var(--ink)}
.dz-status{font-size:12px}
.dz-status.ok{color:var(--accent)}
.dz-status.err{color:#ff6b6b}