* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: #0e1621;
  color: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 16px;
}

.login-container {
  width: 100%;
  max-width: 400px;
  background-color: #17212b;
  border-radius: 12px;
  padding: 32px 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  border: 1px solid #242f3d;
}

.logo-header {
  text-align: center;
  margin-bottom: 24px;
}

.logo-img {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  margin-bottom: 12px;
}

.logo-header h1 {
  font-size: 20px;
  font-weight: 600;
  color: #fff;
}

.logo-header p {
  font-size: 13px;
  color: #7f91a4;
  margin-top: 4px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: #a0acb9;
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  background-color: #0e1621;
  border: 1px solid #242f3d;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: #5288c1;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background-color: #5288c1;
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, opacity 0.2s;
  margin-top: 8px;
}

.btn-primary:hover {
  background-color: #4377af;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.alert-box {
  display: none;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  line-height: 1.4;
}

.alert-error {
  background-color: rgba(239, 83, 80, 0.15);
  color: #ff8a80;
  border: 1px solid rgba(239, 83, 80, 0.3);
}

.alert-success {
  background-color: rgba(76, 175, 80, 0.15);
  color: #81c784;
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.change-pwd-section {
  display: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid #242f3d;
}

.footer-hint {
  text-align: center;
  font-size: 11px;
  color: #556575;
  margin-top: 24px;
}