:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #2c3e50;
    --border-color: #e9ecef;
}

body {
    background-color: var(--background-color);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.container {
    max-width: 1200px;
    padding: 0 1rem;
}

.card {
    border: none;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s ease-in-out;
    height: 100%;
}

.card:hover {
    transform: translateY(-2px);
}

.card-header {
    background-color: var(--secondary-color);
    color: white;
    border-bottom: none;
    border-radius: 0.5rem 0.5rem 0 0 !important;
    padding: 1rem;
}

.card-body {
    padding: 1.5rem;
}

.form-label {
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.form-control, .form-select {
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 0.625rem;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.form-control:focus, .form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.input-group-text {
    background-color: var(--secondary-color);
    color: white;
    border: none;
}

.btn-primary {
    background-color: var(--secondary-color);
    border: none;
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-1px);
}

.alert {
    border-radius: 0.375rem;
    padding: 1rem;
    margin-top: 1rem;
    border: none;
}

.alert-success {
    background-color: rgba(39, 174, 96, 0.1);
    color: var(--success-color);
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--danger-color);
}

.bi {
    font-size: 1.1rem;
    cursor: help;
}

/* Tooltip styling */
.tooltip {
    font-size: 0.875rem;
}

.tooltip-inner {
    background-color: var(--primary-color);
    padding: 0.5rem 1rem;
}

/* Modal styling */
.modal-content {
    border-radius: 0.5rem;
    border: none;
}

.modal-header {
    background-color: var(--secondary-color);
    color: white;
    border-radius: 0.5rem 0.5rem 0 0;
    border-bottom: none;
}

.modal-body {
    padding: 1.5rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

/* Loading spinner */
.spinner-border {
    width: 1.5rem;
    height: 1.5rem;
    border-width: 0.2em;
}

/* Result animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-animation {
    animation: fadeIn 0.3s ease-out forwards;
}

#exchangeRatesResult table {
    margin-top: 15px;
}

h1 {
    color: var(--primary-color);
    font-weight: bold;
    margin-bottom: 30px;
}