:root{
  --primary:#4b6cb7;
  --primary-dark:#3a539b;
  --sidebar-bg:#1e2a3a;
  --sidebar-text:#c9d3e0;
}
*{box-sizing:border-box}
body{
  background:#f4f6f9;
  font-family:'Segoe UI',Arial,sans-serif;
  margin:0;
}
.wrapper{display:flex;min-height:100vh}

/* Sidebar */
.sidebar{
  width:250px;
  background:var(--sidebar-bg);
  color:var(--sidebar-text);
  flex-shrink:0;
  position:fixed;
  top:0;left:0;bottom:0;
  overflow-y:auto;
  z-index:1000;
  transition:left .25s ease;
}
.sidebar-brand{
  padding:20px;
  font-size:18px;
  font-weight:700;
  color:#fff;
  display:flex;
  align-items:center;
  gap:10px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.sidebar-brand i{font-size:24px;color:#7ea2f7}
.sidebar-menu{list-style:none;padding:10px 0;margin:0}
.sidebar-menu li a{
  display:flex;
  align-items:center;
  gap:12px;
  padding:12px 20px;
  color:var(--sidebar-text);
  text-decoration:none;
  font-size:14.5px;
  border-left:3px solid transparent;
}
.sidebar-menu li a:hover, .sidebar-menu li a.active{
  background:rgba(255,255,255,.06);
  border-left-color:var(--primary);
  color:#fff;
}
.sidebar-menu i{font-size:17px;width:20px;text-align:center}

/* Main content */
.main-content{margin-left:250px;flex:1;display:flex;flex-direction:column;min-height:100vh}
.topbar{
  background:#fff;
  padding:14px 25px;
  box-shadow:0 1px 4px rgba(0,0,0,.06);
}
.page-content{padding:25px;flex:1}
.footer-note{padding:15px 25px;color:#8a94a6;font-size:13px;text-align:center}

/* Cards */
.stat-card{
  border:none;
  border-radius:12px;
  color:#fff;
  padding:22px;
  box-shadow:0 4px 12px rgba(0,0,0,.08);
}
.stat-card h3{font-size:28px;font-weight:700;margin:0}
.stat-card p{margin:0;opacity:.9}
.stat-card i{font-size:32px;opacity:.85}
.bg-grad-blue{background:linear-gradient(135deg,#4b6cb7,#182848)}
.bg-grad-green{background:linear-gradient(135deg,#11998e,#38ef7d)}
.bg-grad-orange{background:linear-gradient(135deg,#f7971e,#ffd200)}
.bg-grad-red{background:linear-gradient(135deg,#e52d27,#b31217)}
.bg-grad-purple{background:linear-gradient(135deg,#8e2de2,#4a00e0)}

.card{border:none;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.table thead{background:#f0f3f9}
.login-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#4b6cb7,#182848)}
.login-box{background:#fff;border-radius:14px;padding:40px;width:100%;max-width:400px;box-shadow:0 10px 40px rgba(0,0,0,.25)}
.login-box .brand{text-align:center;margin-bottom:25px}
.login-box .brand i{font-size:40px;color:var(--primary)}

@media(max-width:768px){
  .sidebar{left:-250px}
  .sidebar.show{left:0}
  .main-content{margin-left:0}
}