body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #00796b, #004d40);
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  color: #333;
}
.login-box, .dashboard {
  background: #ffffff;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  width: 100%;
  max-width: 480px;
}
.login-box h2, .dashboard h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #004d40;
  font-weight: bold;
}
form {
  margin-bottom: 20px;
}
input[type="text"], input[type="password"], input[type="file"] {
  width: 100%;
  padding: 14px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 15px;
}
button {
  width: 100%;
  padding: 14px;
  background: #00796b;
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
}
button:hover {
  background: #004d40;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 15px;
}
.image-box {
  text-align: center;
}
.image-box a {
  display: block;
  border-radius: 8px;
  overflow: hidden;
}
.image-box img {
  width: 100%;
  height: 100px;
  object-fit: cover;
  display: block;
  border-radius: 8px;
}
.logout {
  display: block;
  margin-top: 20px;
  text-align: center;
  color: #c62828;
  font-weight: bold;
  text-decoration: none;
}
.error {
  color: #c62828;
  background: #ffebee;
  padding: 10px;
  text-align: center;
  border-radius: 8px;
  font-weight: bold;
}