:root {
  --sidebar-bg: rgba(30,41,59,0.75);
  --primary:#6366f1;
  --secondary:#14b8a6;
  --text:#fff;
  --bg:#0f172a;
  --card-bg: rgba(255,255,255,0.12);
}
body.light {
  --sidebar-bg: rgba(255,255,255,0.15);
  --primary:#6366f1;
  --secondary:#14b8a6;
  --text:#1e293b;
  --bg:#f8fafc;
  --card-bg: rgba(255,255,255,0.9);
}
body {
  margin:0;
  font-family:'Inter',sans-serif;
  background: linear-gradient(-45deg,#6366f1,#14b8a6,#facc15,#f472b6);
  background-size:400% 400%;
  animation: gradientBG 15s ease infinite;
  color:var(--text);
  transition: all 0.3s;
}
@keyframes gradientBG{
  0%{background-position:0% 50%}
  50%{background-position:100% 50%}
  100%{background-position:0% 50%}
}

/* Sidebar */
.sidebar{
  width:260px;
  height:100vh;
  background: var(--sidebar-bg);
  backdrop-filter:blur(16px);
  border-right:1px solid rgba(255,255,255,0.1);
  position:fixed;
  top:0; left:0;
  display:flex;
  flex-direction:column;
  z-index:1100;
  transition: transform 0.3s ease;
  box-sizing:border-box;
}
.sidebar h2{
  text-align:center;
  padding:20px;
  margin:0;
  font-size:20px;
  font-weight:700;
  color:#fff;
  letter-spacing:1px;
}
.sidebar .close-btn{
  display:none;
  position:absolute;
  top:15px;
  right:15px;
  font-size:22px;
  color:#fff;
  background:transparent;
  border:none;
  cursor:pointer;
}
.sidebar .menu{
  display:flex;
  flex-direction:column;
  height:100%;
  padding:10px;
  box-sizing:border-box;
}
.sidebar .menu ul.menu-list{
  display:flex;
  flex-direction:column;
  flex:1;
  list-style:none;
  margin:0;
  padding:0;
}
.sidebar .menu ul.menu-list li{
  margin:6px 0;
}
.sidebar .menu ul.menu-list li a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 18px;
  color:#fff;
  text-decoration:none;
  font-size:15px;
  border-radius:12px;
  transition: all 0.3s;
  cursor:pointer;
}
.sidebar .menu ul.menu-list li a:hover{
  background: linear-gradient(90deg,var(--primary),var(--secondary));
  box-shadow:0 4px 12px rgba(0,0,0,0.25);
  transform:translateX(6px);
}
.sidebar .menu ul.menu-list li a .icon{
  margin-right:12px;
  font-size:16px;
  background: rgba(255,255,255,0.15);
  padding:6px;
  border-radius:50%;
  width:28px; height:28px;
  display:flex;
  align-items:center;
  justify-content:center;
}
/* Submenu */
.submenu{
  max-height:0;
  overflow:hidden;
  border-radius:8px;
  margin:4px 15px;
  transition:max-height 0.4s ease;
}
.submenu a{
  font-size:14px;
  padding:10px 20px 10px 52px;
}
.menu li.active .submenu{
  max-height:500px;
}
.menu li.active > a .menu-toggle{
  transform:rotate(90deg);
}
.sidebar .menu ul.menu-list li.logout{
  margin-top:auto;
}
.sidebar .menu ul.menu-list li.logout a:hover{
  background: linear-gradient(90deg,#ef4444,#f87171);
  box-shadow:0 4px 12px rgba(0,0,0,0.25);
  transform:translateX(6px);
}
.menu{
  flex:1; overflow-y:auto; padding:10px;
}
.menu-toggle{transition: transform 0.3s;}

/* Topbar */
.topbar{
  height:60px;
  background: var(--card-bg);
  backdrop-filter:blur(16px);
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 20px;
  box-shadow:0 2px 6px rgba(0,0,0,0.08);
  position:fixed;
  left:260px; right:0; top:0;
  z-index:1000;
  transition:left 0.3s;
}
.topbar .left{display:flex; align-items:center; gap:15px;}
.topbar .right{display:flex; align-items:center; gap:20px;}
.topbar .search{position:relative;}
.topbar .search input{
  padding:6px 30px 6px 12px;
  border:1px solid #ddd;
  border-radius:6px;
}
.topbar .search i{
  position:absolute;
  right:10px; top:50%;
  transform:translateY(-50%);
  color:#888;
}
.topbar .user img{
  width:34px; height:34px;
  border-radius:50%;
  cursor:pointer;
}

/* Content */
.content{
  margin-left:260px;
  margin-top:60px;
  padding:30px;
  transition: margin-left 0.3s;
}
.card{
  background: var(--card-bg);
  padding:20px;
  border-radius:16px;
  box-shadow:0 4px 12px rgba(0,0,0,0.05);
  margin-bottom:20px;
  transition: transform 0.3s, box-shadow 0.3s;
}
.card:hover{
  transform: translateY(-4px);
  box-shadow:0 10px 20px rgba(0,0,0,0.1);
}
.card h3{margin:0 0 10px;font-size:20px;}

/* Toggle Mobile */
.mobile-toggle{
  display:none; cursor:pointer;
  font-size:22px; color:var(--text);
}

/* Responsive */
@media(max-width:768px){
  .sidebar{transform:translateX(-100%);}
  .sidebar.active{transform:translateX(0);}
  .sidebar .close-btn{display:block;}
  .topbar{left:0;}
  .content{margin-left:0;}
  .mobile-toggle{display:block;}
  body.sidebar-open::before{
    content:""; position:fixed; inset:0;
    background:rgba(0,0,0,0.4);
    backdrop-filter:blur(2px);
    z-index:1050;
  }
}