:root{
  --bg:#eef3f8;
  --panel:#ffffff;
  --panel-soft:#f7faff;
  --border:#d9e2ec;
  --text:#1f2937;
  --muted:#6b7280;
  --primary:#1f4f82;
  --primary-dark:#183b61;
  --shadow:0 10px 24px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
.app{display:grid;grid-template-columns:240px 1fr;height:100vh;gap:14px;padding:14px}
.sidebar{
  background:linear-gradient(180deg,var(--primary-dark) 0%, var(--primary) 100%);
  color:#fff;border-radius:22px;box-shadow:var(--shadow);
  display:flex;flex-direction:column;overflow:hidden
}
.brand{padding:22px 18px 18px;border-bottom:1px solid rgba(255,255,255,.12)}
.brand h1{margin:0;font-size:20px}
.brand p{margin:8px 0 0;font-size:13px;opacity:.85}
.menu{padding:14px;display:grid;gap:10px}
.menu-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;opacity:.75;font-weight:bold;padding:8px 8px 0}
.menu-btn{
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.07);
  color:#fff;border-radius:14px;padding:14px;text-align:left;cursor:pointer;font-size:14px;font-weight:bold
}
.menu-btn.active{background:#fff;color:var(--primary);border-color:#fff}
.sidebar-footer{margin-top:auto;padding:14px;border-top:1px solid rgba(255,255,255,.12)}
.sidebar-note{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);
  border-radius:14px;padding:12px;font-size:13px;line-height:1.45
}
.main{display:grid;grid-template-rows:78px 1fr;gap:14px;min-width:0;min-height:0}
.topbar{
  background:var(--panel);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);
  display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px
}
.topbar h2{margin:0;font-size:24px}
.topbar p{margin:4px 0 0;color:var(--muted);font-size:13px}
.view-container{
  background:var(--panel);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);
  overflow:hidden;min-height:0;position:relative
}
.module-root{height:100%;display:grid;grid-template-rows:auto 1fr;min-height:0}
.module-head{
  padding:14px 16px;border-bottom:1px solid var(--border);background:var(--panel-soft)
}
.module-head h3{margin:0;font-size:16px}
.module-head p{margin:4px 0 0;font-size:12px;color:var(--muted)}
.module-body{padding:12px;overflow:auto;min-height:0;display:grid;gap:10px}
.placeholder{
  border:1px dashed var(--border);border-radius:12px;padding:18px;background:#fbfdff;color:var(--muted)
}
@media (max-width: 900px){
  .app{grid-template-columns:1fr;height:auto;min-height:100vh}
  .main{min-height:calc(100vh - 28px)}
}


.topbar-actions{display:flex;align-items:center;gap:8px}
.topbar-actions button{
  border:1px solid var(--border);
  background:#fff;
  color:var(--text);
  border-radius:12px;
  padding:10px 12px;
  font-size:13px;
  font-weight:bold;
  cursor:pointer;
  box-shadow:var(--shadow);
}
.topbar-actions button:hover{background:var(--panel-soft)}

.app.sidebar-hidden{
  grid-template-columns:0 1fr;
  gap:0;
}
.app.sidebar-hidden .sidebar{
  transform:translateX(-110%);
  opacity:0;
  pointer-events:none;
}
.sidebar{
  transition:transform .18s ease, opacity .18s ease;
}
.main{
  transition:margin .18s ease, width .18s ease;
}