:root{
  --bg:#0b0f19;
  --panel:#0f1629;
  --text:#e8eefc;
  --muted:#9aa7c2;
  --line:#1e2a44;
  --accent:#6aa6ff;
}

*{ box-sizing:border-box; }

body{
  margin:0;
  font-family:system-ui, Segoe UI, Arial;
  background:var(--bg);
  color:var(--text);
}

.app{ display:flex; min-height:100vh; }

.sidebar{
  width:260px;
  background:var(--panel);
  border-right:1px solid var(--line);
  padding:14px;
  position:sticky;
  top:0;
  height:100vh;
  overflow:auto;
}

.brand{
  padding:10px 10px 14px;
  border-bottom:1px solid var(--line);
  margin-bottom:10px;
}
.brand-title{ font-weight:700; }
.brand-sub{ font-size:12px; color:var(--muted); margin-top:4px; }

.main{ flex:1; padding:18px; }

.card{
  background:rgba(255,255,255,0.03);
  border:1px solid var(--line);
  border-radius:14px;
  padding:14px;
  margin-bottom:14px;
}

.nav-link{
  display:block;
  padding:10px 10px;
  margin:4px 0;
  color:var(--text);
  text-decoration:none;
  border-radius:10px;
}
.nav-link:hover{ background:#111d36; }
.logout{ color:#ff8a8a; }

.nav-toggle{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:10px 10px;
  margin:4px 0;
  border-radius:10px;
  border:0;
  background:transparent;
  color:var(--text);
  cursor:pointer;
  font:inherit;
  text-align:left;
}
.nav-toggle:hover{ background:#111d36; }

.chev{
  opacity:.7;
  transition:transform .15s ease;
}
.nav-toggle.open .chev{ transform:rotate(90deg); }

/* DEFAULT CLOSED */
.nav-sub{
  display:none;
  margin:2px 0 10px 0;
  padding-left:10px;
}
.nav-sub.open{ display:block; }

.nav-sublink{
  display:block;
  padding:9px 10px;
  margin:3px 0;
  color:var(--text);
  text-decoration:none;
  border-radius:10px;
  opacity:.92;
}
.nav-sublink:hover{ background:#111d36; }

.spacer{ height:18px; }