* {
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: #fff;
  width: 320px;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.25);
  text-align: center;
}

h1 {
  margin-bottom: 6px;
}

.subtitle {
  margin-bottom: 20px;
  color: #64748b;
}

input {
  width: 100%;
  padding: 10px;
  margin-bottom: 12px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  font-size: 14px;
}

button {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: #22c55e;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 10px;
}

button.secondary {
  background: #e5e7eb;
  color: #111827;
}

button:hover {
  filter: brightness(0.95);
}

#message {
  margin-top: 10px;
  font-size: 13px;
  color: #dc2626;
}