* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif; }

.login-card {
  max-width: 420px;
  margin: 100px auto 0;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  padding: 40px 36px 32px;
}
.login-card h2 {
  font-size: 24px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  text-align: center;
  margin: 0 0 8px;
  padding: 0;
  background: none;
  width: 100%;
}
.login-card .subtitle {
  font-size: 14px;
  color: #777;
  text-align: center;
  margin-bottom: 28px;
}
.login-card label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #444;
  margin-bottom: 6px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
.login-card p {
  margin: 0 0 18px;
  background: none;
  text-align: left;
}
.login-input {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  transition: border-color 0.2s;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
.login-input:focus {
  outline: none;
  border-color: #4a90d9;
  box-shadow: 0 0 0 2px rgba(74, 144, 217, 0.2);
}
.login-input.code-input {
  letter-spacing: 4px;
  text-align: center;
}
.login-btn {
  width: 100%;
  padding: 12px;
  background-color: #4a90d9;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 8px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  transition: background-color 0.2s;
}
.login-btn:hover {
  background-color: #3a7bc8;
}
.login-error {
  background-color: #fef2f2;
  border: 1px solid #fca5a5;
  color: #b91c1c;
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 14px;
  margin-top: 16px;
  text-align: center;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

@media (max-width: 480px) {
  .login-card {
    margin: 40px 16px 0;
    padding: 28px 20px 24px;
  }
}