/* 
 * Corporate Finance Interactive Learning
 * Main Stylesheet
 */

/* ===== Base Styles ===== */
:root {
    /* Color Palette */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --info-color: #3498db;
    
    /* Typography */
    --heading-font: 'Montserrat', sans-serif;
    --body-font: 'Open Sans', sans-serif;
    --code-font: 'Roboto Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--body-font);
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f8f9fa;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-color);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-family: var(--heading-font);
    font-weight: 600;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
    color: white;
}

.btn-secondary {
    background-color: var(--light-color);
    color: var(--dark-color);
}

.btn-secondary:hover {
    background-color: #bdc3c7;
}

/* ===== Header ===== */
.main-header {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.75rem;
    margin-bottom: 0;
    color: white;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 0;
}

.main-nav .nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav .nav-list li {
    margin-left: var(--spacing-md);
}

.main-nav .nav-list a {
    color: white;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem;
    transition: all var(--transition-fast);
}

.main-nav .nav-list a:hover {
    color: var(--secondary-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: white;
    transition: all var(--transition-fast);
}

/* ===== Progress Tracker ===== */
.progress-tracker {
    background-color: var(--light-color);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #ddd;
}

.progress-bar {
    height: 8px;
    background-color: #ddd;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background-color: var(--secondary-color);
    transition: width var(--transition-normal);
}

.progress-stats {
    font-size: 0.85rem;
    color: var(--dark-color);
    text-align: right;
}

.completed-sections {
    font-weight: 600;
}

/* ===== Hero Section ===== */
.hero-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, #34495e 100%);
    color: white;
}

.hero-section .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    padding-right: var(--spacing-lg);
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.hero-image {
    flex: 1;
    text-align: center;
}

/* ===== Author Section ===== */
.author-section {
    padding: var(--spacing-xl) 0;
    background-color: white;
    border-bottom: 1px solid #eee;
}

.author-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.author-image {
    flex: 0 0 250px;
}

.author-image img {
    width: 100%;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.author-info {
    flex: 1;
}

.author-info h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.author-title {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.author-bio {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.linkedin-preview {
    background-color: #f3f6f8;
    border: 1px solid #dce6f1;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.linkedin-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.linkedin-small-img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: var(--spacing-md);
}

.linkedin-name h4 {
    margin-bottom: var(--spacing-xs);
    color: #0a66c2;
}

.linkedin-name p {
    font-size: 0.9rem;
    margin-bottom: 0;
    color: #666;
}

.linkedin-follow-btn {
    display: inline-block;
    background-color: #0a66c2;
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 24px;
    font-weight: 600;
    transition: background-color var(--transition-fast);
}

.linkedin-follow-btn:hover {
    background-color: #004182;
    color: white;
}

.linkedin-icon {
    font-weight: bold;
    margin-right: 5px;
}

/* ===== Content Sections ===== */
.content-section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid #eee;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.25rem;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

.content-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.text-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.text-content h3:first-child {
    margin-top: 0;
}

.formula {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    font-family: var(--code-font);
}

.formula p {
    margin-bottom: var(--spacing-sm);
}

.formula ul {
    margin-bottom: 0;
}

.visual-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-card, .comparison-card, .concept-diagram, .statement-example {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.info-card h4, .comparison-card h4, .concept-diagram h4, .statement-example h4 {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid #eee;
}

.comparison-card table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-card th, .comparison-card td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid #eee;
}

.comparison-card th {
    font-weight: 600;
    background-color: #f8f9fa;
}

.component-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.component h5 {
    margin-bottom: var(--spacing-sm);
}

.component ul {
    margin-bottom: 0;
}

.statement-example table {
    width: 100%;
    border-collapse: collapse;
}

.statement-example th, .statement-example td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid #eee;
}

.statement-example th {
    font-weight: 600;
    background-color: #f8f9fa;
}

/* ===== Interactive Elements ===== */
.interactive-element {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.interactive-element h3 {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Timeline */
.timeline-container {
    position: relative;
    overflow: hidden;
}

.timeline {
    display: flex;
    overflow-x: auto;
    padding: var(--spacing-md) 0;
    scroll-behavior: smooth;
}

.timeline-item {
    min-width: 300px;
    padding: var(--spacing-md);
    margin-right: var(--spacing-md);
    background-color: #f8f9fa;
    border-radius: var(--border-radius-md);
    border-top: 4px solid var(--secondary-color);
    position: relative;
}

.timeline-item::before {
    content: attr(data-year);
    position: absolute;
    top: -12px;
    left: var(--spacing-md);
    background-color: var(--secondary-color);
    color: white;
    padding: 2px 8px;
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.timeline-item h4 {
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.timeline-item p {
    margin-bottom: 0;
    font-size: 0.9rem;
}

.timeline-navigation {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-md);
}

.timeline-prev, .timeline-next {
    background-color: var(--light-color);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin: 0 var(--spacing-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.timeline-prev:hover, .timeline-next:hover {
    background-color: #ddd;
}

/* Capital Structure Tool */
.capital-structure-tool {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
}

.tool-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.control-group {
    margin-bottom: var(--spacing-sm);
}

.control-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.control-group input[type="range"] {
    width: 100%;
}

.range-value {
    display: inline-block;
    margin-left: var(--spacing-sm);
    font-weight: 600;
}

.visualization-container {
    display: flex;
    align-items: center;
    justify-content: space-around;
}

.capital-structure-chart {
    width: 200px;
    height: 300px;
}

.chart-bar {
    width: 100px;
    height: 100%;
    margin: 0 auto;
    background-color: #f8f9fa;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    position: relative;
}

.debt-portion, .equity-portion {
    width: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: height var(--transition-normal);
}

.debt-portion {
    background-color: var(--info-color);
    color: white;
}

.equity-portion {
    background-color: var(--success-color);
    color: white;
}

.portion-label {
    font-size: 0.8rem;
    font-weight: 600;
}

.wacc-display {
    text-align: center;
}

.wacc-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.wacc-formula {
    font-family: var(--code-font);
    font-size: 0.9rem;
    color: #666;
}

/* TVM Calculator */
.tvm-calculator {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
}

.calculator-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.calculator-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.result-panel, .chart-panel {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.result-panel h3 {
    margin-bottom: var(--spacing-md);
}

.growth-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.growth-table th, .growth-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.growth-table th {
    font-weight: 600;
    background-color: #eee;
}

/* Statement Explorer */
.statement-explorer {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: var(--spacing-lg);
}

.explorer-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.explorer-display {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-md);
}

.statement-display, .statement-insights {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.placeholder-content {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: #999;
}

/* Ratio Dashboard */
.ratio-dashboard {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
}

.dashboard-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.ratio-inputs {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.dashboard-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.benchmark-panel, .interpretation-panel, .chart-panel {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.ratio-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.ratio-table th, .ratio-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.ratio-table th {
    font-weight: 600;
    background-color: #eee;
}

.positive {
    color: var(--success-color);
}

.negative {
    color: var(--danger-color);
}

.caution {
    color: var(--warning-color);
}

.chart-container {
    margin-top: var(--spacing-md);
}

.chart-item {
    margin-bottom: var(--spacing-md);
}

.chart-label {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.chart-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.bar-container {
    display: flex;
    align-items: center;
}

.bar-label {
    width: 120px;
    font-size: 0.85rem;
}

.bar {
    height: 24px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-sm);
    transition: width var(--transition-normal);
}

.company-bar {
    background-color: var(--secondary-color);
    color: white;
}

.benchmark-bar {
    background-color: var(--primary-color);
    color: white;
}

.bar-value {
    font-size: 0.85rem;
    font-weight: 600;
}

/* Capital Budgeting Simulator */
.capital-budgeting-simulator {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
}

.simulator-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.cash-flows-section {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.button-group {
    display: flex;
    gap: var(--spacing-md);
}

.simulator-results {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.results-panel, .sensitivity-panel, .comparison-panel {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.result-card {
    background-color: white;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.result-card h4 {
    margin-bottom: var(--spacing-sm);
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.result-interpretation {
    margin-bottom: var(--spacing-sm);
}

.result-formula {
    font-family: var(--code-font);
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 0;
}

.cash-flow-table, .sensitivity-table, .comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.cash-flow-table th, .cash-flow-table td,
.sensitivity-table th, .sensitivity-table td,
.comparison-table th, .comparison-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.cash-flow-table th, .sensitivity-table th, .comparison-table th {
    font-weight: 600;
    background-color: #eee;
}

.sensitivity-section, .comparison-insight, .sensitivity-insight {
    margin-bottom: var(--spacing-md);
}

/* ===== Section Navigation ===== */
.section-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-xl);
}

.nav-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.nav-button {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--light-color);
    color: var(--dark-color);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-button:hover {
    background-color: var(--secondary-color);
    color: white;
}

.nav-button.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-button.disabled:hover {
    background-color: var(--light-color);
    color: var(--dark-color);
}

.section-progress {
    font-weight: 600;
}

.current-section {
    color: var(--secondary-color);
}

/* ===== Footer ===== */
.main-footer {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-xl) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-bottom a {
    color: var(--secondary-color);
    font-weight: 600;
}

.footer-bottom a:hover {
    color: white;
}

/* ===== Responsive Styles ===== */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .tvm-calculator, .ratio-dashboard, .capital-budgeting-simulator, .statement-explorer, .capital-structure-tool {
        grid-template-columns: 1fr;
    }
    
    .explorer-display {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .author-profile {
        flex-direction: column;
        text-align: center;
    }
    
    .author-image {
        max-width: 250px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .hero-section .container {
        flex-direction: column;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: var(--spacing-lg);
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .main-nav .nav-list {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--primary-color);
        flex-direction: column;
        padding: var(--spacing-md);
        display: none;
    }
    
    .main-nav .nav-list.active {
        display: flex;
    }
    
    .main-nav .nav-list li {
        margin: var(--spacing-xs) 0;
    }
    
    .component-list {
        grid-template-columns: 1fr;
    }
    
    .linkedin-header {
        flex-direction: column;
        text-align: center;
    }
    
    .linkedin-small-img {
        margin: 0 auto var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .hero-content h2 {
        font-size: 2.5rem;
    }
    
    .nav-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .author-title {
        font-size: 1rem;
    }
    
    .author-bio {
        font-size: 0.95rem;
    }
}