/* Base Layout Styles */
body {
    background-color: #f4f6f9;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
}

/* Card Styling */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.card-header {
    background: linear-gradient(135deg, #0d6efd, #0b5ed7);
    border-bottom: none;
    padding: 1.25rem 1.5rem;
}

.card-header h5 {
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Form Controls */
.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: #495057;
    margin-bottom: 0.4rem;
}

.form-control {
    border-radius: 8px;
    border: 1px solid #ced4da;
    padding: 0.65rem 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.15);
}

/* Button & Result Styling */
.btn-primary {
    border-radius: 8px;
    padding: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    transition: background-color 0.2s ease;
}

.alert-info {
    background-color: #e7f1ff;
    border: 1px solid #b6d4fe;
    color: #084298;
    border-radius: 8px;
}

/* Loading Spinner Animation */
.spinner-border-sm {
    width: 1.2rem;
    height: 1.2rem;
    border-width: 0.15em;
}