:root{
  --bg:#071022; --panel:#0b1220; --muted:#9aa4b2; --accent:#4f46e5; --danger:#ef4444; --surface:#0b1220;
  --glass: rgba(255,255,255,0.03);
  --transition: 260ms cubic-bezier(.2,.9,.3,1);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
*{box-sizing:border-box}
html,body,#app{height:100%;margin:0;background:linear-gradient(180deg,#071022 0%, #071827 100%);color:#e6eef6}
.sidebar-toggle{position:fixed;left:12px;top:12px;z-index:60;background:var(--accent);color:white;border:0;padding:8px 10px;border-radius:6px;cursor:pointer}
.sidebar{position:fixed;left:0;top:0;bottom:0;width:320px;background:var(--panel);padding:12px;overflow:auto;transform:translateX(0);transition:transform var(--transition);z-index:50}
.sidebar.closed{transform:translateX(-110%)}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.close-btn{background:transparent;border:0;color:var(--muted);cursor:pointer;font-size:18px}
.auth-section{background:var(--glass);padding:10px;border-radius:8px;margin-bottom:12px}
.auth-tabs{display:flex;gap:6px;margin-bottom:8px}
.auth-tabs .tab{flex:1;padding:6px;border-radius:6px;border:1px solid rgba(255,255,255,0.03);background:transparent;color:var(--muted);cursor:pointer}
.auth-tabs .tab.active{background:var(--accent);color:white}
.auth-form{display:flex;flex-direction:column;gap:8px}
.auth-form label{display:flex;flex-direction:column;font-size:13px;color:var(--muted)}
.auth-form input, .auth-form textarea, input, select{padding:8px;border-radius:6px;border:1px solid rgba(255,255,255,0.04);background:transparent;color:white}
.form-row{display:flex;gap:8px;align-items:center}
button{cursor:pointer}
button.small{padding:6px 8px;border-radius:6px;border:0;background:rgba(255,255,255,0.04);color:var(--muted)}
button.primary{padding:8px 12px;border-radius:8px;border:0;background:var(--accent);color:white}
button.danger{background:var(--danger);color:white}
.link{background:transparent;border:0;color:var(--accent);cursor:pointer}
.error{color:var(--danger);font-size:13px;margin-top:6px}

/* Channel list */
.channel-list{list-style:none;padding:0;margin:8px 0 16px 0;display:flex;flex-direction:column;gap:6px}
.channel-list li{padding:8px;border-radius:6px;background:transparent;color:var(--muted);display:flex;justify-content:space-between;align-items:center;cursor:pointer}
.channel-list li.active{background:rgba(79,70,229,0.12);color:white}
.channel-actions{display:flex;gap:6px;align-items:center}
.channel-actions button{padding:4px 6px;font-size:12px}

/* Main area */
main#main{margin-left:340px;padding:18px;transition:margin-left var(--transition)}
.sidebar.closed + main#main{margin-left:28px}
#mainHeader{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
#channelTitle{font-size:18px;font-weight:600}
.helper{color:var(--muted);font-size:13px}
.messages-area{height:60vh;background:var(--surface);border-radius:8px;padding:12px;overflow:auto;border:1px solid rgba(255,255,255,0.02)}
.message{padding:8px;border-radius:6px;margin-bottom:8px;background:rgba(255,255,255,0.02)}
.message .meta{font-size:12px;color:var(--muted);margin-bottom:6px}
.composer{display:flex;gap:8px;padding:12px;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));border-top:1px solid rgba(255,255,255,0.02)}
.composer textarea{flex:1;min-height:48px;border-radius:8px;padding:8px;background:transparent;color:white;border:1px solid rgba(255,255,255,0.03)}

/* Panels & modals */
.panel{position:fixed;right:20px;top:80px;width:420px;background:var(--panel);border-radius:8px;z-index:70;box-shadow:0 8px 30px rgba(0,0,0,0.6);overflow:hidden}
.panel.hidden{display:none}
.panel-header{display:flex;justify-content:space-between;align-items:center;padding:12px;border-bottom:1px solid rgba(255,255,255,0.02)}
.panel-body{padding:12px}
.panel-close{background:transparent;border:0;color:var(--muted);cursor:pointer;font-size:18px}

/* Modal */
.modal{position:fixed;left:0;top:0;right:0;bottom:0;background:rgba(0,0,0,0.45);display:flex;align-items:center;justify-content:center;z-index:80}
.modal.hidden{display:none}
.modal-content{background:var(--panel);padding:12px;border-radius:8px;width:420px;max-width:95%}

/* Animations */
.slide-left{transform:translateX(0);transition:transform var(--transition)}
.slide-left-out{transform:translateX(-120%);transition:transform var(--transition)}
.slide-down{transform:translateY(0);transition:transform var(--transition)}
.slide-down-out{transform:translateY(-120%);transition:transform var(--transition)}

/* small screens */
@media (max-width:900px){
  .sidebar{width:86%;max-width:360px}
  main#main{margin-left:0;padding:12px}
  .sidebar.open{transform:translateX(0)}
  .sidebar.closed{transform:translateX(-110%)}
}