.app {
  position: relative; z-index: 5;
  display: grid; grid-template-columns: 320px 1fr;
  height: 100vh; width: 100vw;
}
.sidebar {
  background: var(--panel); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; padding: 18px 14px; gap: 14px;
  overflow: hidden;
}
.brand h1 { font-size: 1.2rem; color: var(--accent); }
.brand span { display:block; font-size:0.6rem; color: var(--muted); margin-top:4px; }
.side-title { font-size: 0.6rem; color: var(--muted); letter-spacing:3px; margin-top: 6px; }
.conv-list { flex: 1; overflow-y: auto; display:flex; flex-direction:column; gap:4px; }
.side-foot { display:flex; gap:8px; justify-content:space-between; padding-top:10px; border-top:1px solid var(--line); }

.chat { display:flex; flex-direction:column; background: rgba(0,0,0,0.7); }
.chat-head { padding: 18px 24px; border-bottom: 1px solid var(--line); }
.chat-head h2 { font-size: 0.95rem; color: var(--accent); }
.messages { flex:1; overflow-y:auto; padding: 20px 24px; display:flex; flex-direction:column; gap:10px; }
.composer { display:flex; gap:8px; padding: 14px 18px; border-top: 1px solid var(--line); background: rgba(0,0,0,0.6); }
.composer input { flex:1; background: #0a0a0d; border:1px solid var(--line-2); color:var(--text); padding:12px; font-family:'JetBrains Mono'; font-size:0.85rem; outline:none; border-radius:2px; }
.composer input:focus { border-color: var(--accent); }
.composer button {
  background: var(--accent); color:#000; border:0; padding:0 22px;
  font-family:'Orbitron'; letter-spacing:2px; cursor:pointer; font-weight:700; font-size:0.7rem;
}
.composer button:disabled { opacity:0.3; cursor:not-allowed; }

.gate { position: fixed; inset:0; z-index:9999; display:flex; align-items:center; justify-content:center; background: rgba(0,0,0,0.95); }
.gate-box { text-align:center; padding: 40px 50px; border:1px solid var(--accent); background: rgba(0,0,0,0.9); max-width:420px; }
.gate-box h1 { font-size: 2rem; color: var(--accent); margin-bottom: 6px; }
.gate-sub { color: var(--muted); font-size:0.7rem; letter-spacing:3px; margin-bottom: 20px; }
#gateMsg { color: var(--text); font-size:0.8rem; margin-bottom:20px; }

@media (max-width: 768px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: var(--mobileSide, flex); }
}

.chat-head { display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; }
.side-foot { flex-wrap: wrap; }
.side-foot .ghost { flex:1; min-width: 60px; text-align:center; }