* {
  box-sizing: border-box;
  font-family: system-ui, sans-serif;
}

body {
  background: #0f0f0f;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.container {
  background: #151515;
  padding: 2.5rem;
  width: 360px;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.6);
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
}

.form-control {
  margin-bottom: 1.2rem;
}

.form-control input {
  width: 100%;
  padding: 0.7rem;
  background: #0f0f0f;
  border: 1px solid #333;
  color: #fff;
  border-radius: 6px;
}

.form-control small {
  color: #ff6b6b;
  visibility: hidden;
}

button {
  width: 100%;
  padding: 0.8rem;
  background: #6c63ff;
  border: none;
  color: #fff;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
}

.strength {
  font-size: 0.8rem;
  margin-top: 0.3rem;
}