body {
  font-family: Arial;
  background: #f4f6f8;
  padding: 20px;
}

h2 { margin-bottom: 15px; }

input, select {
  width: 100%;
  padding: 8px;
  margin: 6px 0;
}

button {
  padding: 8px 16px;
  background: #22c55e;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.box {
  background: #fff;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 10px;
}

.logout {
  background: crimson;
}

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

.tool-card {
  background: linear-gradient(135deg,#8ec5fc,#e0c3fc);
  padding: 20px;
  border-radius: 16px;
  cursor: pointer;
  transition: .2s;
}

.tool-card:hover {
  transform: scale(1.05);
}

.center {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.login-box {
  background: #fff;
  padding: 30px;
  border-radius: 10px;
}

.err {
  color: red;
}