* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(145deg, #d9edf7, #f5f9fc 55%, #c7e2f0);
  color: #18364a;
}

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 430px;
  padding: 38px 34px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 18px;
  box-shadow: 0 16px 45px rgba(24, 73, 102, 0.16);
  text-align: center;
}

.brand-logo {
  width: 112px;
  height: 112px;
  object-fit: contain;
  margin-bottom: 12px;
}

h1 {
  margin: 0;
  color: #176b9a;
  font-size: 25px;
  line-height: 1.25;
}

.subtitle {
  margin: 9px 0 22px;
  color: #607d8b;
  font-size: 14px;
}

.divider {
  height: 1px;
  background: #dce8ee;
  margin: 0 0 24px;
}

h2 {
  margin: 0 0 8px;
  font-size: 21px;
}

.instruction {
  margin: 0 0 24px;
  color: #6b7f8a;
  font-size: 14px;
}

form {
  text-align: left;
}

label {
  display: block;
  margin: 16px 0 7px;
  font-size: 14px;
  font-weight: 600;
}

input {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid #cbdbe4;
  border-radius: 8px;
  background: #fff;
  color: #18364a;
  font-size: 16px;
}

input:focus {
  outline: 2px solid #8cc7e5;
  border-color: #176b9a;
}

button {
  width: 100%;
  margin-top: 24px;
  padding: 14px;
  border: 0;
  border-radius: 8px;
  background: #176b9a;
  color: white;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: #12577f;
}

button:disabled {
  opacity: 0.65;
  cursor: wait;
}

#login-message {
  min-height: 20px;
  margin: 12px 0 0;
  color: #a52a2a;
  font-size: 13px;
  text-align: center;
}

.footer {
  margin: 25px 0 0;
  color: #81939c;
  font-size: 12px;
}

@media (max-width: 480px) {
  .login-card {
    padding: 30px 22px;
  }

  h1 {
    font-size: 22px;
  }
}