* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0f1115;
  color: #e6e6e6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.card {
  width: 320px;
  padding: 32px;
  background: #1a1d24;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
h1 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 24px;
  text-align: center;
}
label {
  display: block;
  font-size: 13px;
  color: #9aa0ab;
  margin-bottom: 6px;
}
input {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 16px;
  border-radius: 8px;
  border: 1px solid #2c313c;
  background: #0f1115;
  color: #e6e6e6;
  font-size: 15px;
}
input:focus {
  outline: none;
  border-color: #5b8cff;
}
button {
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: 8px;
  background: #5b8cff;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
button:disabled {
  opacity: 0.6;
  cursor: default;
}
button:hover:not(:disabled) {
  background: #4677f0;
}
.error {
  color: #ff6b6b;
  font-size: 13px;
  margin-top: -8px;
  margin-bottom: 16px;
  min-height: 16px;
}