body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(145deg, #1f1f1f, #121212);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.upload-container {
  text-align: center;
  padding: 30px;
  background: #1e1e1e;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0,0,0,0.4);
  width: 90%;
  max-width: 500px;
}

.drop-zone {
  margin-top: 20px;
  padding: 40px;
  border: 2px dashed #444;
  border-radius: 12px;
  background: #2a2a2a;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.drop-zone.drag-over {
  border-color: #1e90ff;
  background: #3a3a3a;
}

.drop-zone p {
  margin: 0;
  font-size: 1rem;
  color: #ccc;
}

input[type="file"] {
  display: none;
}

#status {
  margin-top: 20px;
  font-size: 0.9rem;
}

.logout-link {
  display: inline-block;
  margin-top: 20px;
  color: #1e90ff;
  text-decoration: none;
}

.auth-container {
  background-color: #1e1e1e;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0,0,0,0.4);
  width: 90%;
  max-width: 400px;
  text-align: center;
}

.auth-container h2 {
  margin-bottom: 20px;
  color: #fff;
}

.auth-container form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.auth-container input[type="text"],
.auth-container input[type="password"] {
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: #2a2a2a;
  color: #fff;
}

.auth-container input:focus {
  outline: 2px solid #1e90ff;
}

.auth-container button {
  padding: 12px;
  background-color: #1e90ff;
  border: none;
  border-radius: 8px;
  color: white;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease;
}

.auth-container button:hover {
  background-color: #187bcd;
}

.redirect-link {
  margin-top: 15px;
  font-size: 0.9rem;
  color: #ccc;
}

.redirect-link a {
  color: #1e90ff;
  text-decoration: none;
}

.error {
  margin-top: 10px;
  color: #ff4c4c;
}