:root {
    --primary-color: #006B6B;
    --primary-dark: #005555;
    --primary-light: #008080;
    --secondary-color: #D4AF37;
    --secondary-dark: #B8960C;
    --secondary-light: #FFD700;
    --background-color: #f8f9fa;
    --text-color: #006B6B;
    --light-text: #ffffff;
    --error-color: #dc3545;
    --success-color: #198754;
    --warning-color: #ffc107;
}

/* Global Styles */
body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Header Styles */
.main-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    padding: 2rem;
    border-radius: 15px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px rgba(212, 175, 55, 0.3);
}

.main-header h1 {
    color: var(--light-text);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.main-header h3 {
    color: var(--secondary-color);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
    font-size: 1.4rem;
}

/* Input Section Styles */
.input-section {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.15);
    margin-bottom: 2rem;
    border: 1px solid rgba(212, 175, 55, 0.1);
}

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

.form-control:focus, 
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(0, 107, 107, 0.25);
}

.form-range::-webkit-slider-thumb {
    background: var(--primary-color);
}

.form-range::-moz-range-thumb {
    background: var(--primary-color);
}

/* Button Styles */
.button-row {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    transform: none !important;
}

/* Loading Overlay */
#loading-overlay {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(5px);
    z-index: 1050;
}

#loading-overlay p {
    color: var(--primary-color);
    font-weight: 500;
}

/* Results Section */
.output-section {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.15);
    margin-top: 2rem;
    animation: fadeIn 0.5s ease-out;
}

.table-responsive {
    max-height: 500px;
    overflow-y: auto;
    border-radius: 8px;
}

.table th {
    background-color: var(--primary-color);
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

.table td {
    vertical-align: middle;
}

/* Plot Container */
#plot-container {
    border: 1px solid rgba(0, 107, 107, 0.1);
    border-radius: 8px;
    padding: 1rem;
    background: white;
}

/* Info Section */
.info-section {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    margin-top: 2rem;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.15);
}

.info-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-section ul li,
.info-section ol li {
    margin-bottom: 0.5rem;
}

/* Error Messages */
.error-alert {
    background-color: var(--error-color);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    animation: slideDown 0.3s ease-out;
}

/* Tooltips */
.tooltip {
    font-family: 'Poppins', sans-serif;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
    from { transform: translateY(-100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .main-header h1 {
        font-size: 2rem;
    }
    
    .main-header h3 {
        font-size: 1.2rem;
    }
    
    .button-row {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .input-section {
        padding: 1rem;
    }
}

/* Print Styles */
@media print {
    .input-section,
    .button-row,
    #loading-overlay {
        display: none !important;
    }
    
    .output-section {
        box-shadow: none;
        padding: 0;
    }
    
    .table th {
        background-color: #f8f9fa !important;
        color: black !important;
    }
}

/* Table sorting styles */
.sortable {
    cursor: pointer;
    position: relative;
    padding-right: 20px !important;
}

.sortable i {
    position: absolute;
    right: 5px;
    color: #999;
}

.sortable.asc i {
    color: #000;
}

.sortable.desc i {
    color: #000;
}

.sortable.asc i::before {
    content: "\f0de" !important;  /* fa-sort-up */
}

.sortable.desc i::before {
    content: "\f0dd" !important;  /* fa-sort-down */
}

.sortable:hover {
    background-color: #f8f9fa;
}

/* Add this CSS to your main.css file or inside a <style> tag in the head section */
nav {
    margin-bottom: 1.5rem;
}

nav a {
    transition: all 0.3s ease;
}

nav a:hover {
    opacity: 0.8;
}

nav a img {
    height: 32px;
    width: auto;
    margin-right: 0.5rem;
}

nav a span {
    font-weight: bold;
    font-size: 1.25rem;
    color: #333;
}