:root {
    /* Modern, sophisticated color palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    
    --color-text-primary: #0a0e27;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #fafbfc;
    --color-bg-tertiary: #f1f5f9;
    
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    
    /* Subtle gradients */
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    --gradient-surface: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
    
    /* Refined shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 40px -8px rgba(0, 0, 0, 0.12), 0 8px 16px -4px rgba(0, 0, 0, 0.06);
    --shadow-2xl: 0 32px 64px -12px rgba(0, 0, 0, 0.16);
    
    /* Modern Typography - Inter */
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing scale */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* Smooth animations */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 400;
    letter-spacing: -0.01em;
    width: 100%;
    max-width: 100vw;
    box-sizing: border-box;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 15% 25%, rgba(37, 99, 235, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 85% 75%, rgba(6, 182, 212, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

body > * {
    position: relative;
    z-index: 1;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0;
}

/* Modern Hero Header */
.header {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: var(--gradient-hero);
    color: white;
    position: relative;
    overflow: hidden;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

.header-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease-out;
}

.title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.04em;
    line-height: 1.2;
    color: #ffffff;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    opacity: 0.9;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.95);
}

.header-description {
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    font-weight: 400;
    opacity: 0.85;
    margin-top: var(--spacing-sm);
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.main-content {
    padding: var(--spacing-4xl) var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

/* Clean Section Cards */
.budget-section,
.user-tax-section {
    background: var(--color-bg-primary);
    border-radius: 24px;
    padding: 0;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid var(--color-border-light);
    animation: fadeInUp 0.6s ease-out both;
}

.user-tax-section:nth-child(1) { animation-delay: 0.1s; }
.budget-section:nth-child(2) { animation-delay: 0.2s; }

.budget-section:hover,
.user-tax-section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-border);
}

.section-header {
    padding: var(--spacing-xl) var(--spacing-2xl);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg-primary);
    transition: all var(--transition-normal);
    user-select: none;
    border-bottom: 1px solid var(--color-border-light);
}

.section-header:hover {
    background: var(--color-bg-secondary);
}

.section-header.expanded {
    border-bottom-color: var(--color-border);
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.expand-icon {
    width: 24px;
    height: 24px;
    stroke: var(--color-text-secondary);
    transition: transform var(--transition-normal), stroke var(--transition-fast);
    flex-shrink: 0;
}

.section-header:hover .expand-icon {
    stroke: var(--color-text-primary);
}

.section-header.expanded .expand-icon {
    transform: rotate(180deg);
}

.section-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
    padding: 0 var(--spacing-2xl);
    opacity: 0;
}

.section-content.expanded {
    max-height: 10000px;
    padding: var(--spacing-2xl);
    opacity: 1;
}

.chart-container {
    width: 100%;
    min-height: 600px;
    background: var(--color-bg-secondary);
    border-radius: 16px;
    padding: var(--spacing-xl);
    overflow: visible;
    position: relative;
    border: 1px solid var(--color-border-light);
}

@media (max-width: 768px) {
    .chart-container {
        min-height: 350px;
        padding: var(--spacing-sm) 0; /* Remove horizontal padding for full width */
        overflow-x: auto;
        overflow-y: visible;
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
        /* Extend to viewport edges by offsetting parent padding */
        margin-left: calc(-1 * var(--spacing-md));
        margin-right: calc(-1 * var(--spacing-md));
        width: calc(100% + 2 * var(--spacing-md));
        max-width: 100vw;
    }
    
    .chart-container svg {
        width: 100% !important;
        max-width: 100% !important;
        height: auto;
        display: block;
    }
    
    #budget-sankey svg,
    #user-sankey svg {
        width: 100% !important;
        max-width: 100vw !important;
    }
    
    /* Improve touch scrolling on chart container */
    .chart-container:active {
        cursor: grabbing;
    }
}

#budget-sankey,
#user-sankey {
    position: relative;
    min-height: 600px;
    overflow: visible;
}

.card {
    background: var(--color-bg-primary);
    border-radius: 24px;
    overflow: hidden;
}

.description {
    color: var(--color-text-secondary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    font-size: 1.125rem;
    line-height: 1.7;
    max-width: 700px;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}
    
    @media (max-width: 768px) {
        .description {
            font-size: 1rem;
            line-height: 1.6;
            margin-bottom: var(--spacing-lg);
        }
    }

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    align-items: center;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.input-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background: var(--color-bg-primary);
    border-radius: 12px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1.5px solid var(--color-border);
    transition: all var(--transition-normal);
    width: 100%;
    max-width: 500px;
}

.input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    transform: translateY(-1px);
}

.input-prefix {
    color: var(--color-text-secondary);
    margin-right: var(--spacing-sm);
    font-weight: 600;
    font-size: 1.125rem;
}

.input-field {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1.25rem;
    color: var(--color-text-primary);
    outline: none;
    font-weight: 500;
    font-family: var(--font-body);
}

.input-field::placeholder {
    color: var(--color-text-tertiary);
    opacity: 0.5;
    font-weight: 400;
}

.button-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    width: 100%;
    max-width: 500px;
    letter-spacing: -0.01em;
    box-shadow: var(--shadow-sm);
}

.button-primary svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

.button-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.button-primary:active {
    transform: translateY(0);
}

.allocation-results {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.breakdown {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.breakdown-item {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.breakdown-item-total {
    background: var(--color-bg-primary);
    border: 2px solid var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.breakdown-item-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.breakdown-item-row:not(.breakdown-item-total) {
    cursor: pointer;
}

.breakdown-item-row:not(.breakdown-item-total):hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
    border-color: var(--color-primary);
    background: var(--color-bg-primary);
}

.breakdown-item-label {
    font-size: 0.9375rem;
    color: var(--color-text-primary);
    font-weight: 600;
    flex: 1;
    min-width: 0;
}

.breakdown-item-total .breakdown-item-label {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.breakdown-item-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.breakdown-item-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    line-height: 1.2;
    white-space: nowrap;
}

.breakdown-item-total .breakdown-item-value {
    font-size: 1.5rem;
    font-weight: 800;
}

.breakdown-item-percentage {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.breakdown-item-total .breakdown-item-percentage {
    font-size: 0.875rem;
    font-weight: 600;
}

/* Sankey Chart Styles */
.sankey-node rect {
    cursor: pointer;
    fill-opacity: 0.95;
    transition: all var(--transition-normal);
}

.sankey-node rect:hover {
    fill-opacity: 1;
    filter: brightness(1.1);
}

.sankey-node text {
    pointer-events: none;
    font-size: 13px !important;
    fill: var(--color-text-primary) !important;
    font-weight: 600 !important;
    transition: all var(--transition-fast);
    opacity: 1 !important;
    font-family: var(--font-body) !important;
}

.sankey-node:hover text {
    font-size: 14px !important;
    font-weight: 700 !important;
}

.sankey-link {
    fill: none;
    stroke-opacity: 0.4;
    transition: all var(--transition-normal);
}

.sankey-link:hover {
    stroke-opacity: 0.7;
}

.sankey-tooltip {
    position: absolute;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md) var(--spacing-lg);
    pointer-events: none;
    box-shadow: var(--shadow-xl);
    font-size: 0.875rem;
    z-index: 1000;
    font-family: var(--font-body);
}

.sankey-tooltip-title {
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
    font-size: 0.875rem;
}

.sankey-tooltip-value {
    color: var(--color-primary);
    font-size: 1.125rem;
    font-weight: 700;
}

/* Dimmed state for nodes when another is expanded */
.sankey-node.dimmed rect {
    opacity: 0.15 !important;
    filter: grayscale(90%) !important;
}

.sankey-link.dimmed {
    opacity: 0.08 !important;
}

/* Hover highlighting states */
.sankey-node.highlighted rect {
    opacity: 1 !important;
    filter: brightness(1.2) drop-shadow(0 2px 8px rgba(0, 0, 0, 0.2)) !important;
    stroke-width: 2px !important;
}

.sankey-node.highlighted text {
    opacity: 1 !important;
    font-weight: 700 !important;
}

.sankey-node.faded rect {
    opacity: 0.2 !important;
    filter: grayscale(80%) !important;
}

.sankey-node.faded text {
    opacity: 0.2 !important;
}

.sankey-link.highlighted {
    stroke-opacity: 0.9 !important;
    stroke-width: calc(var(--stroke-width, 2px) * 1.5) !important;
    filter: brightness(1.1) !important;
}

.sankey-link.faded {
    stroke-opacity: 0.2 !important;
}

/* Node Expansion Overlay - Award-worthy design with seamless transition */
.node-expansion-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    overflow: visible;
    border-radius: 16px;
    
    /* Start from node position - transform origin set dynamically via JS */
    transform: scale(0);
    transform-origin: center center;
    
    /* Smooth expansion animation */
    transition: 
        opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.node-expansion-overlay.active {
    opacity: 1;
    pointer-events: all;
    transform: scale(1);
}

.node-expansion-overlay.collapsing {
    opacity: 0;
    transform: scale(0);
    transition: 
        opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.expansion-content {
    padding: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    animation: fadeInUp 0.5s ease-out;
    max-height: 100%;
    overflow-y: visible;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    width: 100%;
    box-sizing: border-box;
}

.expansion-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
    position: relative;
    flex-shrink: 0;
}

.expansion-title {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: 0;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.expansion-total {
    font-size: clamp(0.875rem, 1.25vw, 1rem);
    font-weight: 600;
    color: var(--color-text-secondary);
    letter-spacing: -0.01em;
    margin-top: var(--spacing-xs);
}

.expansion-close {
    position: absolute;
    top: 0;
    right: 0;
    width: 48px;
    height: 48px;
    border: none;
    background: var(--color-bg-secondary);
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    color: var(--color-text-secondary);
}

.expansion-close:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    transform: rotate(90deg);
}

.expansion-close svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
}

.expansion-categories {
    display: grid;
    gap: var(--spacing-md);
}

.expansion-category-card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    animation: fadeInUp 0.5s ease-out both;
    box-shadow: var(--shadow-sm);
}

.expansion-category-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-border);
}

.expansion-category-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.expansion-category-title {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
    line-height: 1.3;
    flex: 1;
    min-width: 150px;
}

.expansion-category-info .expansion-category-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0;
    min-width: auto;
}

.expansion-category-info .expansion-category-meta {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
    white-space: nowrap;
}

.expansion-category-info .expansion-category-value {
    font-size: 1rem;
    font-weight: 700;
}

.expansion-category-info .expansion-category-percentage {
    font-size: 0.8rem;
    font-weight: 500;
}

.expansion-category-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.expansion-category-value {
    font-size: clamp(1.125rem, 1.5vw, 1.5rem);
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.expansion-category-percentage {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.expansion-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--color-bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.expansion-progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
    animation: progressFill 1s ease-out;
}

@keyframes progressFill {
    from { width: 0; }
}

.expansion-category-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 0;
    font-weight: 400;
}

.expansion-category-examples {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: 12px;
    border-left: 4px solid var(--color-primary);
}

.expansion-category-examples strong {
    display: block;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.expansion-category-examples ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

.expansion-category-examples li {
    font-size: 1rem;
    color: var(--color-text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.6;
}

.expansion-category-examples li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.25rem;
}

/* Revenue expansion styles */
.expansion-section {
    margin-bottom: var(--spacing-xl);
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    position: relative;
}

.expansion-section-title {
    font-size: clamp(1.125rem, 1.75vw, 1.375rem);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.expansion-section-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.expansion-allocation-chart {
    width: 100%;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--color-border-light);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    max-height: 500px;
    flex-shrink: 0;
    position: relative;
    box-sizing: border-box;
}

.expansion-allocation-chart svg {
    max-width: 100%;
    height: auto;
}

.expansion-allocation-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.expansion-allocation-item {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: 12px;
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    animation: fadeInUp 0.5s ease-out both;
}

.expansion-allocation-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-border);
}

.expansion-allocation-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.expansion-allocation-value {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.expansion-allocation-percentage {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Budget Breakdown Layout */
.expansion-breakdown-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    flex: 1;
    min-height: 0;
}

@media (min-width: 1024px) {
    .expansion-breakdown-layout {
        grid-template-columns: 2fr 1fr;
        align-items: start;
    }
}

/* Pie Chart Styles */
.expansion-pie-chart {
    width: 100%;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--color-border-light);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    max-height: 500px;
    flex-shrink: 0;
    position: relative;
    box-sizing: border-box;
}

.expansion-pie-chart canvas {
    max-width: 100%;
    height: auto;
}

/* Pie Chart Legend Styles */
.pie-legend {
    font-family: var(--font-body);
}

.pie-legend .legend-item {
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.pie-legend .legend-item:hover {
    opacity: 0.7;
}

.pie-legend .legend-item text {
    font-family: var(--font-body);
}

/* Category Info Styles (replacing category cards) */
.expansion-category-descriptions {
    margin-top: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    overflow-y: visible;
    overflow-x: hidden;
    flex: 1;
    min-height: 0;
}

.expansion-category-info {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: all var(--transition-normal);
    animation: fadeInUp 0.5s ease-out both;
    box-shadow: var(--shadow-xs);
    flex-shrink: 0;
}

.expansion-category-info:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--color-border);
    background: var(--color-bg-secondary);
}

.expansion-category-info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: nowrap;
    margin-bottom: var(--spacing-xs);
}

.expansion-category-info .expansion-category-title {
    font-size: 0.95rem;
    margin: 0;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    flex: 1;
    min-width: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-wrap: break-word;
}

.expansion-category-info .expansion-category-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
    flex-shrink: 0;
}

.expansion-category-info .expansion-category-percentage {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
    margin-top: var(--spacing-xs);
}

/* Responsive expansion - Now handled in main mobile section below */

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Loading Animation */
#loading-message {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    position: relative;
    font-weight: 500;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

#loading-message::after {
    content: '';
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Smooth Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Focus States for Accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

.button-primary:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.3);
    outline-offset: 3px;
}

.input-field:focus-visible {
    outline: none;
}

.section-header:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
    border-radius: 24px;
}

/* Selection Styling */
::selection {
    background: var(--color-primary);
    color: white;
}

::-moz-selection {
    background: var(--color-primary);
    color: white;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-text-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* ============================================
   MOBILE RESPONSIVE DESIGN - COMPLETE REDESIGN
   ============================================ */

/* Mobile First - Base styles for mobile */
@media (max-width: 768px) {
    /* Container and Layout */
    .container {
        padding: 0;
        max-width: 100%;
    }
    
    /* Header - Ultra Compact */
    .header {
        padding: var(--spacing-lg) var(--spacing-md);
        min-height: 160px;
    }
    
    .title {
        font-size: 1.75rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .subtitle {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .header-description {
        font-size: 0.875rem;
        margin-top: var(--spacing-xs);
        line-height: 1.5;
    }
    
    /* Main Content */
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
        gap: var(--spacing-lg);
    }
    
    /* Sections */
    .budget-section,
    .user-tax-section {
        border-radius: 16px;
        margin-bottom: var(--spacing-md);
    }
    
    .section-header {
        padding: var(--spacing-md) var(--spacing-lg);
        min-height: 56px; /* Touch target size */
    }
    
    .section-title {
        font-size: 1.125rem;
    }
    
    .section-content.expanded {
        padding: var(--spacing-md);
    }
    
    /* Chart Container */
    .chart-container {
        min-height: 600px; /* Increased from 350px to accommodate all nodes */
        padding: var(--spacing-sm) 0; /* Remove horizontal padding on mobile for full width */
        border-radius: 0; /* Remove border radius for edge-to-edge on mobile */
        /* Extend to viewport edges by offsetting parent padding */
        margin-left: calc(-1 * var(--spacing-md));
        margin-right: calc(-1 * var(--spacing-md));
        width: calc(100% + 2 * var(--spacing-md));
        max-width: 100vw;
        /* Ensure both horizontal and vertical scrolling work smoothly */
        overflow-x: auto;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
        scrollbar-color: var(--color-text-tertiary) var(--color-bg-tertiary);
        max-height: 90vh; /* Prevent chart from being taller than viewport */
    }
    
    .chart-container::-webkit-scrollbar {
        height: 8px;
        width: 8px;
    }
    
    .chart-container::-webkit-scrollbar-track {
        background: var(--color-bg-tertiary);
        border-radius: 4px;
    }
    
    .chart-container::-webkit-scrollbar-thumb {
        background: var(--color-text-tertiary);
        border-radius: 4px;
    }
    
    .chart-container::-webkit-scrollbar-thumb:hover {
        background: var(--color-text-secondary);
    }
    
    #budget-sankey,
    #user-sankey {
        min-height: 600px; /* Increased from 350px */
        position: relative;
    }
    
    /* Form Elements */
    .input-group {
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }
    
    .input-label {
        font-size: 0.75rem;
    }
    
    .input-wrapper {
        max-width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        min-height: 48px; /* Touch target */
    }
    
    .input-field {
        font-size: 1.125rem;
    }
    
    .button-primary {
        width: 100%;
        padding: var(--spacing-md);
        min-height: 48px; /* Touch target */
        font-size: 1rem;
    }
    
    /* Breakdown */
    .breakdown {
        gap: var(--spacing-xs);
        margin-top: var(--spacing-md);
    }
    
    .breakdown-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .breakdown-item-label {
        font-size: 0.875rem;
    }
    
    .breakdown-item-value {
        font-size: 1.125rem;
    }
    
    .breakdown-item-total .breakdown-item-value {
        font-size: 1.25rem;
    }
    
    .breakdown-item-percentage {
        font-size: 0.75rem;
    }
    
    /* Modal/Expansion Overlay - Full Screen Mobile */
    .node-expansion-overlay {
        border-radius: 0 !important;
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        width: 100vw !important;
        height: 100vh !important;
        max-width: 100vw !important;
        max-height: 100vh !important;
        z-index: 9999 !important;
        overflow-y: auto !important;
        overflow-x: hidden !important;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: auto; /* Allow normal scroll behavior instead of contain */
        box-sizing: border-box;
        margin: 0 !important;
        padding: 0 !important;
    }
    
    /* Allow scrolling within overlay, prevent body scroll */
    body.modal-open {
        overflow: hidden !important;
        position: fixed !important;
        width: 100% !important;
        height: 100% !important;
        touch-action: none;
    }
    
    /* Ensure overlay is scrollable */
    body.modal-open .node-expansion-overlay {
        touch-action: pan-y;
    }
    
    .expansion-content {
        padding: var(--spacing-sm) var(--spacing-xs);
        max-width: 100%;
        width: 100%;
        display: flex;
        flex-direction: column;
        min-height: auto;
        box-sizing: border-box;
    }
    
    /* Ensure all expansion content fits within viewport */
    .expansion-section,
    .expansion-pie-chart,
    .expansion-allocation-chart,
    .expansion-breakdown-layout,
    .expansion-category-descriptions,
    .expansion-header,
    .expansion-title,
    .expansion-total {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
    
    /* Prevent any element from causing horizontal scroll */
    .expansion-content * {
        max-width: 100%;
        box-sizing: border-box;
    }
    
    /* Ensure charts don't overflow */
    .expansion-pie-chart canvas,
    .expansion-allocation-chart canvas {
        max-width: 100% !important;
        height: auto !important;
    }
    
    /* Ensure Chart.js container doesn't clip legend */
    .expansion-pie-chart > div,
    .expansion-allocation-chart > div {
        overflow: visible !important;
        min-height: 100%;
    }
    
    .expansion-header {
        margin-bottom: var(--spacing-md);
        padding-bottom: var(--spacing-sm);
        flex-shrink: 0;
    }
    
    .expansion-title {
        font-size: 1.25rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .expansion-total {
        font-size: 0.875rem;
    }
    
    .expansion-close {
        width: 44px;
        height: 44px;
        top: var(--spacing-xs);
        right: var(--spacing-xs);
    }
    
    /* Sections in Modal - More Compact */
    .expansion-section {
        margin-bottom: var(--spacing-sm);
        flex-shrink: 0;
    }
    
    .expansion-section-title {
        font-size: 0.9375rem;
        margin-bottom: var(--spacing-xs);
        line-height: 1.3;
    }
    
    .expansion-section-description {
        font-size: 0.75rem;
        margin-bottom: var(--spacing-xs);
        line-height: 1.4;
    }
    
    /* Pie Chart - Mobile Optimized - More Compact */
    .expansion-pie-chart,
    .expansion-allocation-chart {
        min-height: 240px;
        max-height: none; /* Remove max-height to allow legend to show */
        height: auto; /* Allow height to grow with content */
        padding: var(--spacing-xs) var(--spacing-xs) var(--spacing-lg) var(--spacing-xs); /* Extra bottom padding for legend */
        margin: var(--spacing-xs) 0;
        overflow: visible; /* Ensure legend isn't clipped */
    }
    
    /* Breakdown Layout - Stack on Mobile */
    .expansion-breakdown-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        margin-top: var(--spacing-xs);
    }
    
    /* Category Info - Compact Mobile */
    .expansion-category-descriptions {
        gap: var(--spacing-xs);
        max-height: none;
    }
    
    .expansion-category-info {
        padding: var(--spacing-xs);
        margin-bottom: var(--spacing-xs);
    }
    
    .expansion-category-info-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-xs);
    }
    
    .expansion-category-info .expansion-category-title {
        font-size: 0.875rem;
        margin: 0;
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
        line-height: 1.4;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        word-wrap: break-word;
        flex: 1;
    }
    
    .expansion-category-info .expansion-category-value {
        font-size: 0.9375rem;
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .expansion-category-info .expansion-category-percentage {
        font-size: 0.75rem;
        margin-top: var(--spacing-xs);
        line-height: 1.4;
    }
    
    /* Sankey Chart Labels - Better Mobile Positioning */
    .sankey-node text {
        font-size: 10px !important;
        font-weight: 600 !important;
    }
    
    /* Improve node touch targets on mobile */
    .sankey-node rect {
        min-width: 20px;
        cursor: pointer;
        -webkit-tap-highlight-color: rgba(37, 99, 235, 0.2);
        tap-highlight-color: rgba(37, 99, 235, 0.2);
    }
    
    /* Mobile tooltip - positioned better for touch */
    .sankey-tooltip {
        font-size: 0.8125rem;
        padding: var(--spacing-sm) var(--spacing-md);
        max-width: 85vw;
        min-width: 200px;
        box-shadow: var(--shadow-xl);
        /* Position tooltip above finger on mobile */
        transform: translateY(-100%);
        margin-top: -10px;
    }
    
    /* Improve link visibility on mobile */
    .sankey-link {
        stroke-width: 2px !important;
        stroke-opacity: 0.5;
    }
    
    .sankey-link:hover,
    .sankey-link:active {
        stroke-opacity: 0.8;
    }
}

/* Small Mobile Devices */
@media (max-width: 480px) {
    .header {
        padding: var(--spacing-md) var(--spacing-sm);
        min-height: 140px;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.875rem;
    }
    
    .main-content {
        padding: var(--spacing-md) var(--spacing-sm);
        gap: var(--spacing-md);
    }
    
    .section-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .section-content.expanded {
        padding: var(--spacing-sm);
    }
    
    .chart-container {
        min-height: 500px; /* Increased from 300px for small mobile */
        padding: var(--spacing-xs) 0; /* Remove horizontal padding on small mobile for full width */
        /* Extend to viewport edges by offsetting parent padding */
        margin-left: calc(-1 * var(--spacing-sm));
        margin-right: calc(-1 * var(--spacing-sm));
        width: calc(100% + 2 * var(--spacing-sm));
        max-width: 100vw;
        /* Better scrolling on small screens */
        overflow-x: auto;
        overflow-y: auto;
        max-height: 85vh; /* Slightly smaller max-height on very small screens */
    }
    
    #budget-sankey,
    #user-sankey {
        min-height: 500px; /* Increased for small mobile */
    }
    
    /* Even smaller labels on very small screens */
    .sankey-node text {
        font-size: 9px !important;
    }
    
    .sankey-tooltip {
        max-width: 90vw;
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .expansion-content {
        padding: var(--spacing-sm);
    }
    
    .expansion-pie-chart,
    .expansion-allocation-chart {
        min-height: 250px;
        max-height: none; /* Remove max-height to allow legend to show */
        height: auto; /* Allow height to grow with content */
        padding: var(--spacing-xs) var(--spacing-xs) var(--spacing-lg) var(--spacing-xs); /* Extra bottom padding for legend */
        overflow: visible; /* Ensure legend isn't clipped */
    }
    
    .expansion-title {
        font-size: 1.125rem;
    }
}