* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, sans-serif;
}

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.container {
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  padding: 40px;
  border-radius: 16px;
  max-width: 520px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

h1 {
  text-align: center;
  margin-bottom: 10px;
}

p {
  text-align: center;
  margin-bottom: 25px;
  font-size: 0.95rem;
  opacity: 0.9;
}

input {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  border: none;
  margin-bottom: 15px;
  font-size: 1rem;
}

button {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  color: #fff;
  font-weight: bold;
  cursor: pointer;
}

.btn-download {
  display: block;
  margin-top: 20px;
  text-align: center;
  padding: 12px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
  color: #fff;
  background: linear-gradient(135deg, #f7971e, #ffd200);
}

.btn-download:hover {
  opacity: 0.9;
}

button:hover {
  opacity: 0.9;
}

.result {
  display: none;
  margin-top: 20px;
  padding: 16px;
  border-radius: 10px;
  text-align: center;
  font-weight: bold;
}

.ok {
  background: rgba(0, 200, 83, 0.2);
  border: 1px solid #00c853;
}

.alert {
  background: rgba(255, 193, 7, 0.2);
  border: 1px solid #ffc107;
}

footer {
  margin-top: 25px;
  text-align: center;
  font-size: 0.75rem;
  opacity: 0.7;
}

@media (max-width: 480px) {
  .container {
    padding: 25px;
  }
}