/* CSS Variables for Color Palette */
:root {
    --primary-dark: #393E46;
    --secondary-dark: #222831;
    --accent-cyan: #00ADB5;
    --light-gray: #EEEEEE;
    --accent-yellow: #FFD369;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
}

/* Dark Mode Variables */
[data-bs-theme="dark"] {
    --bs-body-bg: var(--secondary-dark);
    --bs-body-color: var(--light-gray);
    --bs-card-bg: var(--primary-dark);
    --bs-border-color: #495057;
}

/* Base Styles */
* {
    box-sizing: border-box;
}
.visually-hidden-focusable:not(:focus):not(:focus-within) {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0,0,0,0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Back to top */
#backToTop {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1040;
    display: none;
    width: 48px;
    height: 48px;
    border-radius: 999px;
    background: var(--accent-cyan);
    color: white;
    border: none;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

#backToTop i {
    font-size: 1.25rem;
}

#backToTop:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 24px rgba(0, 0, 0, 0.3);
}

#backToTop:focus {
    outline: 3px solid rgba(0, 173, 181, 0.4);
    outline-offset: 2px;
}

[data-bs-theme="dark"] #backToTop {
    background: var(--accent-yellow);
    color: var(--secondary-dark);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--light-gray);
    color: var(--secondary-dark);
    transition: all 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

.display-4 {
    font-weight: 900;
    letter-spacing: -0.02em;
}

/* Header Styles */
.header-main {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    color: var(--light-gray) !important;
    font-size: 1.5rem;
    font-weight: 800;
}

.navbar-brand:hover {
    color: var(--accent-cyan) !important;
}

/* Logo image sizing */
.logo-img {
    height: 28px;
    width: auto;
    display: inline-block;
    vertical-align: middle;
}

@media (max-width: 768px) {
    .logo-img {
        height: 24px;
    }
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--primary-dark) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

/* Card Styles - Brutal Minimalism */
.card {
    border: 3px solid var(--secondary-dark);
    border-radius: 0;
    box-shadow: 8px 8px 0 var(--secondary-dark);
    transition: all 0.3s ease;
    background: white;
}

.card:hover {
    transform: translate(-2px, -2px);
    box-shadow: 10px 10px 0 var(--secondary-dark);
}

[data-bs-theme="dark"] .card {
    background: var(--primary-dark);
    border-color: var(--accent-cyan);
    box-shadow: 8px 8px 0 var(--accent-cyan);
}

[data-bs-theme="dark"] .card:hover {
    box-shadow: 10px 10px 0 var(--accent-cyan);
}

.calculator-card {
    position: static;
    top: auto;
}

.card-header {
    background: var(--secondary-dark);
    color: white;
    border-bottom: 3px solid var(--secondary-dark);
    padding: 1.25rem;
}

[data-bs-theme="dark"] .card-header {
    background: var(--accent-cyan);
    color: var(--secondary-dark);
    border-color: var(--accent-cyan);
}

/* Form Styles */
.form-control {
    border: 2px solid var(--secondary-dark);
    border-radius: 0;
    padding: 0.75rem 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 0.2rem rgba(0, 173, 181, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--secondary-dark);
    margin-bottom: 0.5rem;
}

[data-bs-theme="dark"] .form-label {
    color: var(--light-gray);
}

/* Button Styles */
.btn {
    border-radius: 0;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.5rem 1rem;
    border-width: 2px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: white;
}

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

.btn-outline-secondary {
    border-color: var(--secondary-dark);
    color: var(--secondary-dark);
}

.btn-outline-secondary:hover {
    background: var(--secondary-dark);
    border-color: var(--secondary-dark);
}

.btn-outline-danger {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.btn-outline-light {
    border-color: rgba(255, 255, 255, 0.5);
    color: rgba(255, 255, 255, 0.8);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    color: white;
}

/* Metric Cards */
.metric-card {
    border-width: 4px;
    transition: all 0.3s ease;
}

.metric-card .card-body {
    padding: 2rem 1rem;
}

.metric-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 0.5rem;
    line-height: 1;
}

.metric-label {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
    opacity: 0.8;
}

/* Metric Card Color Variants */
.churn-card {
    border-color: var(--danger-color);
    background: linear-gradient(135deg, #fff5f5 0%, #fed7d7 100%);
}

.churn-card .metric-icon,
.churn-card .metric-value {
    color: var(--danger-color);
}

.retention-card {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #f0fff4 0%, #c6f6d5 100%);
}

.retention-card .metric-icon,
.retention-card .metric-value {
    color: var(--success-color);
}

.net-churn-card {
    border-color: var(--info-color);
    background: linear-gradient(135deg, #e6fffa 0%, #b2f5ea 100%);
}

.net-churn-card .metric-icon,
.net-churn-card .metric-value {
    color: var(--info-color);
}

.revenue-card {
    border-color: var(--warning-color);
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
}

.revenue-card .metric-icon,
.revenue-card .metric-value {
    color: #d69e2e;
}

/* Dark Mode Metric Cards */
[data-bs-theme="dark"] .churn-card {
    background: rgba(220, 53, 69, 0.1);
}

[data-bs-theme="dark"] .retention-card {
    background: rgba(40, 167, 69, 0.1);
}

[data-bs-theme="dark"] .net-churn-card {
    background: rgba(23, 162, 184, 0.1);
}

[data-bs-theme="dark"] .revenue-card {
    background: rgba(255, 193, 7, 0.1);
}

/* Chart Containers */
canvas {
    max-width: 100%;
    height: auto;
}

/* Center the pie chart canvas within its container */
#pieChart {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

/* Analysis Section */
.analysis-item {
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-cyan);
    background: rgba(0, 173, 181, 0.05);
    border-radius: 0 8px 8px 0;
}

.analysis-item h6 {
    color: var(--accent-cyan);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

/* FAQ Section */
.faq-section {
    background: var(--primary-dark);
    color: white;
}

.faq-section h2 {
    color: var(--accent-yellow);
}

.accordion-item {
    border: 2px solid var(--secondary-dark);
    border-radius: 0;
    margin-bottom: 1rem;
}

.accordion-button {
    background: var(--light-gray);
    color: var(--secondary-dark);
    border: none;
    font-weight: 600;
    padding: 1.25rem;
}

.accordion-button:not(.collapsed) {
    background: var(--accent-cyan);
    color: white;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: var(--accent-cyan);
}

.accordion-body {
    background: white;
    color: var(--secondary-dark);
    padding: 1.5rem;
}

/* Modal Styles */
.modal-content {
    border: 3px solid var(--secondary-dark);
    border-radius: 0;
}

.modal-header {
    background: var(--secondary-dark);
    color: white;
    border-bottom: 3px solid var(--secondary-dark);
}

.modal-title {
    font-weight: 700;
}

.btn-close {
    filter: invert(1);
}

/* Offcanvas Styles */
.offcanvas {
    border-left: 4px solid var(--accent-cyan);
}

.offcanvas-header {
    background: var(--secondary-dark);
    color: white;
}

.offcanvas-title {
    font-weight: 700;
}

/* Footer */
.footer-main {
    background: var(--secondary-dark);
    color: var(--light-gray);
    border-top: 4px solid var(--accent-cyan);
}

.footer-main p {
    margin-bottom: 0;
    font-weight: 600;
}

/* Footer improvements */
.footer-main .container {
    text-align: center;
}

.footer-main a {
    color: var(--light-gray);
}

.footer-main a:hover {
    color: var(--accent-cyan);
    text-decoration: underline;
}

.footer-main small {
    color: var(--light-gray) !important;
}

 

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

.tooltip-inner {
    background: var(--secondary-dark);
    color: white;
    border-radius: 0;
    padding: 0.5rem 1rem;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--accent-cyan);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Empty State */
#emptyState {
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .metric-card .card-body {
        padding: 1.5rem 1rem;
    }
    
    .metric-value {
        font-size: 2rem;
    }
    
    .metric-icon {
        font-size: 2rem;
    }
    
    .calculator-card {
        position: static;
    }
    
    .card {
        box-shadow: 4px 4px 0 var(--secondary-dark);
    }
    
    .card:hover {
        transform: none;
        box-shadow: 4px 4px 0 var(--secondary-dark);
    }
    
    [data-bs-theme="dark"] .card {
        box-shadow: 4px 4px 0 var(--accent-cyan);
    }
    
    [data-bs-theme="dark"] .card:hover {
        box-shadow: 4px 4px 0 var(--accent-cyan);
    }
    
    .navbar .btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .metric-value {
        font-size: 1.75rem;
    }
    
    .metric-label {
        font-size: 0.8rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .navbar .btn {
        padding: 0.35rem 0.7rem;
        font-size: 0.85rem;
    }
}

/* Print Styles */
@media print {
    .header-main,
    .hero-section,
    .faq-section,
    .footer-main,
    .btn,
    .offcanvas,
    .modal {
        display: none !important;
    }
    
    .card {
        border: 1px solid #000;
        box-shadow: none;
        break-inside: avoid;
    }
    
    .metric-card {
        border-width: 2px;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus States */
.btn:focus,
.form-control:focus,
.accordion-button:focus {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .card {
        border-width: 4px;
    }
    
    .btn {
        border-width: 3px;
    }
    
    .form-control {
        border-width: 3px;
    }
}