:root{
  --primary:#0D6EFD;
  --primary-dark:#0B5ED7;
  --secondary:#1F2937;
  --success:#16A34A;
  --danger:#DC2626;
  --warning:#F59E0B;
  --info:#0284C7;
  --background:#F4F7FB;
  --surface:#FFFFFF;
  --border:#E5E7EB;
  --text:#111827;
  --text-light:#6B7280;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --transition:.25s ease;
}

*{margin:0;padding:0;box-sizing:border-box}

html,body{
  width:100%;
  height:100%;
  font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;
  background:var(--background);
  color:var(--text);
}

body{overflow-x:hidden}

a{text-decoration:none;color:inherit}
ul{list-style:none}

#app{min-height:100vh}

.sidebar{
  position:fixed;
  top:0;
  left:0;
  width:260px;
  height:100vh;
  background:linear-gradient(180deg,var(--primary),#084298);
  color:#fff;
  padding:25px;
}

.logo{
  text-align:center;
  margin-bottom:35px;
}

.logo h4{
  margin-top:12px;
  font-size:22px;
}

.sidebar li{
  padding:14px 16px;
  margin-bottom:8px;
  border-radius:12px;
  cursor:pointer;
  transition:var(--transition);
}

.sidebar li:hover{
  background:rgba(255,255,255,.15);
}

.content{
  margin-left:260px;
  padding:30px;
  min-height:100vh;
}

.topbar{
  background:#fff;
  border-radius:var(--radius);
  padding:18px 24px;
  box-shadow:var(--shadow);
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:30px;
}

.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:20px;
}

.dashboard-card{
  background:#fff;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:24px;
}

.dashboard-card h5{
  color:var(--text-light);
  font-size:15px;
}

.dashboard-card h2{
  margin-top:15px;
  color:var(--primary);
  font-size:34px;
}

.card{
  background:#fff;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.btn-primary{
  background:var(--primary);
  border:none;
}

.btn-primary:hover{
  background:var(--primary-dark);
}

.form-control{
  border-radius:10px;
  border:1px solid var(--border);
}

.loading{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:100vh;
  font-size:22px;
  color:var(--primary);
}

@media (max-width:900px){

.sidebar{
  position:relative;
  width:100%;
  height:auto;
}

.content{
  margin-left:0;
}

.topbar{
  flex-direction:column;
  gap:10px;
  align-items:flex-start;
}

}