:root {
    --primary-color: #4a90e2; /* A fresh, professional blue */
    --secondary-color: #50e3c2; /* A vibrant accent color (teal) */
    --background-color: #f7f9fc; /* A very light, clean gray */
    --text-color: #333;
    --heading-color: #2c3e50;
    --card-background: #ffffff;
    --border-color: #e0e7ee;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--heading-color);
    font-weight: 600;
}

.navbar {
    background-color: var(--card-background) !important;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.navbar .navbar-brand {
    color: var(--primary-color) !important;
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar .nav-link {
    color: #555 !important;
    font-weight: 500;
    transition: color 0.3s ease;
}

.navbar .nav-link:hover, .navbar .nav-link.active {
    color: var(--primary-color) !important;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #357abd;
    border-color: #357abd;
    transform: translateY(-2px);
}

.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.card-header {
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.footer {
    background-color: var(--heading-color);
    color: white;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: white;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(74, 144, 226, 0.25);
}

.badge.bg-success { background-color: #28a745 !important; }
.badge.bg-warning { background-color: #ffc107 !important; }
.badge.bg-danger { background-color: #dc3545 !important; }
.badge.bg-info { background-color: var(--secondary-color) !important; }
.badge.bg-primary { background-color: var(--primary-color) !important; }