:root {
  --dark-blue: #003366;
  --mid-blue: #004080;
  --light-blue: #3399ff;
  --accent-color: #0056b3;
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --navbar-bg: #002b55;
  --shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

html {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  background-color: var(--bg-color);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-primary);
  margin: 0;
}

.container {
  flex: 1 0 auto;
  padding-bottom: 2rem;
}

.navbar {
  background-color: var(--navbar-bg) !important;
  box-shadow: var(--shadow);
  padding: 0.8rem 0;
}

.navbar-brand {
  font-weight: bold;
  font-size: 1.5rem;
  color: #fff !important;
}

.nav-link {
  color: rgba(255, 255, 255, 0.8) !important;
  font-weight: 500;
  margin-left: 10px;
}

.nav-link:hover {
  color: #fff !important;
}

.footer {
  flex-shrink: 0;
  background-color: #fff;
  color: var(--text-secondary);
  border-top: 1px solid #dee2e6 !important;
  padding: 1.5rem 0;
}

.footer a {
  color: var(--accent-color);
  text-decoration: none;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid rgba(0, 0, 0, .125);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, .05);
  margin-bottom: 1.5rem;
}

.card-header {
  background-color: var(--dark-blue);
  color: #fff;
  font-weight: bold;
  border-top-left-radius: 8px !important;
  border-top-right-radius: 8px !important;
  padding: 0.75rem 1.25rem;
}

.card-body {
  padding: 1.5rem;
}

.form-label {
  font-weight: 600;
  color: var(--dark-blue);
}

.form-control {
  border: 1px solid #ced4da;
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
}

.form-select {
  border: 1px solid #ced4da;
  border-radius: 6px;
  padding: 0.6rem 0.75rem;
}

.form-control:focus {
  border-color: var(--light-blue);
  box-shadow: 0 0 0 0.25rem rgba(0, 51, 102, 0.25);
}

.btn-primary {
  background-color: var(--dark-blue);
  border-color: var(--dark-blue);
  font-weight: 600;
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
}

.btn-primary:hover {
  background-color: var(--mid-blue);
  border-color: var(--mid-blue);
}

.btn-success {
  background-color: #198754;
  border: none;
  font-weight: 600;
}

.input-group-text {
  background-color: #e9ecef;
  border: 1px solid #ced4da;
  color: var(--text-secondary);
}

.login-container {
  max-width: 420px;
  margin: 100px auto;
}

.display-1,
.display-4 {
  color: var(--text-primary);
}

.text-muted {
  color: var(--text-secondary) !important;
}