:root{
  --primary:#2563eb;
  --success:#10b981;
  --danger:#ef4444;
  --dark:#111827;
  --glass: rgba(255,255,255,0.1);
}

*{ box-sizing:border-box; }

body{
  font-family:'Poppins',sans-serif;
  margin:0;
  background: linear-gradient(135deg, #8d0505, #e70f0fbd);
  color:white;
  transition:0.4s;
  

}

.dark{
  background:var(--dark);
  color:#eee;
}

/* HEADER */
header{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:70px;
      background: rgb(93 20 20);
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 20px;
  z-index:1100;
}
.menu-toggle{
  position:relative;
  z-index:1200;
  font-size:22px;
  cursor:pointer;
}
header{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:70px;
  z-index:1100;
}
.card,
.dashboard-card,
.total-alunos{
  position:relative;
 
}
main{
  margin-left:250px;
  margin-top:70px; /* mesma altura do header */
  padding:20px;
  transition:0.3s;
}
@media(max-width:900px){

  .sidebar{
    left:-250px;
  }

  .sidebar.active{
    left:0;
  }

  main{
    margin-left:0;
  }

  .menu-toggle{
    display:block;
  }
}
.menu-toggle{
  display:none;
  font-size:22px;
  cursor:pointer;
}

.logo{
  font-weight:600;
}

.header-actions button{
  margin-left:10px;
}
 
/* BOTÕES */
button{
  background:var(--primary);
  border:none;
  padding:10px 15px;
  border-radius:8px;
  color:white;
  cursor:pointer;
  transition:0.3s;
}

button:hover{
  transform:scale(1.05);
  opacity:0.9;
}

/* SIDEBAR */
.sidebar{
  width:230px;
  position:fixed;
  height:100%;
  background:rgba(0,0,0,0.4);
  backdrop-filter:blur(10px);
  padding-top:20px;
  transition:0.4s;
}

.sidebar button{
  display:block;
  width:97%;
  background:none;
  padding:15px;
  text-align:left;
  color:white;
}

.sidebar button:hover{
  background:rgba(255,255,255,0.1);
}

.sidebar.active{
  left:0;
}

main{
  margin-left:230px;
  padding:30px;
  transition:0.4s;
}

/* CARDS */
.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:20px;
}

.card{
  background:var(--glass);
  padding:25px;
  border-radius:20px;
  backdrop-filter:blur(15px);
  transition:0.4s;
}

.card:hover{
  transform:translateY(-5px);
}

/* FORM */
input{
  padding:10px;
  margin:8px 0;
  border:none;
  border-radius:8px;
  width:100%;
}

/* LISTAS */
.lista div{
  background:var(--glass);
  padding:12px;
  margin-bottom:10px;
  border-radius:10px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
/* FUNDO DA TELA DE LOGIN */
.login-container{
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;

  background-image: url(""); /* caminho da imagem */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* CAIXA DO LOGIN */
.login-box{
  background: rgba(0,0,0,0.6);
  padding: 40px;
  border-radius: 10px;
  text-align: center;
  color: white;
  backdrop-filter: blur(5px);
}

/* LOGIN */
.login-container{
  display:flex;
  justify-content:center;
  align-items:center;
  height:100vh;
  
}

.login-box{
  background:var(--glass);
  padding:40px;
  border-radius:20px;
  backdrop-filter:blur(15px);
  width:90%;
  max-width:500px;
  text-align:center;
}

/* TOAST */
.toast{
  position:fixed;
  bottom:20px;
  right:20px;
  background:var(--success);
  padding:15px 20px;
  border-radius:10px;
  opacity:0;
  transition:0.4s;
}

.toast.show{
  opacity:1;
}

/* RESPONSIVO */
@media(max-width:900px){
  .sidebar{
    left:-230px;
  }

  main{
    margin-left:0;
  }

  .menu-toggle{
    display:block;
  }
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:600;
  font-size:18px;
}

.logo-img{
  width:45px;
  height:45px;
  object-fit:contain;
  border-radius:8px;
}
/* DIAGRAMA UML */

.uml-container{
display:flex;
align-items:center;
justify-content:center;
gap:80px;
margin-top:40px;
flex-wrap:wrap;
}

.ator{
font-size:20px;
text-align:center;
font-weight:bold;
}

.casos{
display:flex;
flex-direction:column;
gap:20px;
}

.caso{
border:2px solid #00ffcc;
border-radius:40px;
padding:10px 20px;
background:#0f172a;
color:white;
text-align:center;
width:200px;
}

  .uml-box{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:40px;
  margin-top:20px;
}

.classe{
  background:#1e293b;
  padding:20px;
  border-radius:10px;
  width:200px;
  color:white;
  box-shadow:0 0 10px rgba(0,0,0,0.5);
}

.classe h3{
  text-align:center;
  margin-bottom:10px;
}

.relacao{
  font-size:20px;
  color:white;
}

.classe strong{
  color:#00ffcc;
}

.relacao span{
  display:block;
  margin-top:10px;
  color:#38bdf8;
}