/* Basis */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  height: 100vh;
  background: linear-gradient(135deg, #1e1e2f 0%, #2c3e50 100%);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #f0f0f0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Zentrale Box */
.container {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(16px);
  padding: 2.5rem;
  border-radius: 16px;
  width: 100%;
  max-width: 800px;
  box-shadow: 0 0 20px rgba(0,0,0,0.4);
}

h1, h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  color: #ffffffcc;
}

form {
  margin-bottom: 2rem;
}

input[type="file"] {
  width: 100%;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid #444;
  background-color: #2c3e50;
  color: #fff;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

input[type="submit"] {
  width: 100%;
  padding: 0.75rem;
  background: linear-gradient(135deg, #00bfa6, #00897b);
  border: none;
  color: white;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s ease;
}

input[type="submit"]:hover {
  background: linear-gradient(135deg, #00d8b0, #009e88);
}

ul {
  list-style: disc;
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

li {
  margin: 0.4rem 0;
  color: #d0e1f9;
}

a.logout {
  text-align: center;
  display: block;
  margin-top: 1rem;
  color: #ff8888;
  text-decoration: none;
}

a.logout:hover {
  text-decoration: underline;
}

.error {
  color: #ff4d4d;
  margin-bottom: 1rem;
  text-align: center;
}