:root {
    --color-bg: #FDFBF7;
    --color-bg-alt: #F5F1EA;
    --color-surface: #FFFFFF;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #5C5C5C;
    --color-text-muted: #8A8A8A;
    --color-hardware: #2D5A4A;
    --color-hardware-light: #E8F0ED;
    --color-building: #8B5A2B;
    --color-building-light: #F5EDE4;
    --color-power: #C4533A;
    --color-power-light: #FCE9E5;
    --color-cooling: #3B6B8C;
    --color-cooling-light: #E5EEF4;
    --color-operations: #6B5B8C;
    --color-operations-light: #F0ECF5;
    --flow-hardware: #4A8B73;
    --flow-building: #C4884A;
    --flow-power: #E07A5F;
    --flow-cooling: #5B9BBF;
    --flow-operations: #9B8BBF;
    --color-accent: #8B3830;
    --color-accent-subtle: #A84840;
    --font-display: 'Source Serif 4', Georgia, serif;
    --font-body: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-4xl) var(--space-lg) var(--space-xl);
}

.header {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: var(--space-3xl);
    align-items: start;
    padding-bottom: var(--space-3xl);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    margin-bottom: var(--space-3xl);
}

@media (max-width: 1024px) {
    .header {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.header-content {
    max-width: 680px;
}

.eyebrow {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.25rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.title .highlight {
    color: var(--color-accent);
    font-style: italic;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 560px;
}

.assumptions-panel {
    background: var(--color-surface);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
}

.assumptions-title {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.assumptions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md) var(--space-xl);
}

.assumption {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.assumption-value {
    font-size: 1.25rem;
    font-weight: 600;
}

.assumption-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.sankey-section {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-4xl);
}

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

.sankey-header h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.sankey-header p {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
}

.sankey-header strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.sankey-container {
    background: var(--color-surface);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    overflow-x: auto;
    position: relative;
}

/* Sankey SVG Styles */
.sankey-node-rect {
    cursor: pointer;
    transition: opacity var(--transition-fast), filter var(--transition-fast);
}

.sankey-node-rect:hover,
.sankey-node-rect.highlight {
    filter: brightness(1.1);
}

.sankey-link {
    cursor: pointer;
    transition: fill-opacity var(--transition-fast);
}

.sankey-link:hover,
.sankey-link.highlight {
    fill-opacity: 0.55 !important;
}

/* Sankey Labels */
.label-title {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    fill: var(--color-text-primary);
}

.label-amount {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 600;
    fill: var(--color-text-primary);
}

.label-name {
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 600;
    fill: var(--color-text-primary);
}

.label-amount-small {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 500;
    fill: var(--color-text-secondary);
}

.label-item {
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 500;
    fill: var(--color-text-primary);
}

.label-item-amount {
    font-family: var(--font-body);
    font-size: 10px;
    font-weight: 500;
    fill: var(--color-text-muted);
}

.tooltip {
    position: fixed;
    background: var(--color-text-primary);
    color: #FFFFFF;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    pointer-events: none;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    z-index: 1000;
    max-width: 320px;
    box-shadow: var(--shadow-xl);
}

.tooltip.visible {
    opacity: 1;
    transform: translateY(0);
}

.tooltip-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.tooltip-amount {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-accent-subtle);
    margin-bottom: 4px;
}

.tooltip-percent {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 8px;
}

.tooltip-description {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.5;
}

.detail-section {
    margin-bottom: var(--space-4xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--space-xl);
    text-align: center;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: calc(-1 * var(--space-md));
    margin-bottom: var(--space-xl);
}

.category-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: var(--space-lg);
}

.category-card {
    background: var(--color-surface);
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
    animation: fadeInUp 0.6s ease backwards;
}

.category-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.category-card:nth-child(1) {
    animation-delay: 0.1s;
}

.category-card:nth-child(2) {
    animation-delay: 0.2s;
}

.category-card:nth-child(3) {
    animation-delay: 0.3s;
}

.category-card:nth-child(4) {
    animation-delay: 0.4s;
}

.category-card:nth-child(5) {
    animation-delay: 0.5s;
}

.category-card:nth-child(6) {
    animation-delay: 0.6s;
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-icon svg {
    width: 22px;
    height: 22px;
}

.hardware-icon {
    background: var(--color-hardware-light);
    color: var(--color-hardware);
}

.building-icon {
    background: var(--color-building-light);
    color: var(--color-building);
}

.power-icon {
    background: var(--color-power-light);
    color: var(--color-power);
}

.cooling-icon {
    background: var(--color-cooling-light);
    color: var(--color-cooling);
}

.operations-icon {
    background: var(--color-operations-light);
    color: var(--color-operations);
}

.other-icon {
    background: #F0F0F0;
    color: #666666;
}

.card-title-group {
    flex: 1;
}

.card-title-group h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.card-amount {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.card-percent {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    padding: 4px 10px;
    border-radius: 20px;
}

.card-body {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.opex-note {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-style: italic;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-alt);
    border-radius: var(--radius-sm);
}

.breakdown-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.breakdown-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-md);
}

.breakdown-name {
    font-size: 0.875rem;
    font-weight: 500;
}

.breakdown-amount {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums;
}

.breakdown-bar {
    height: 4px;
    background: var(--color-bg-alt);
    border-radius: 2px;
    overflow: hidden;
}

.breakdown-fill {
    height: 100%;
    border-radius: 2px;
    transition: width var(--transition-slow);
}

[data-category="hardware"] .breakdown-fill {
    background: var(--color-hardware);
}

[data-category="building"] .breakdown-fill {
    background: var(--color-building);
}

[data-category="power"] .breakdown-fill {
    background: var(--color-power);
}

[data-category="cooling"] .breakdown-fill {
    background: var(--color-cooling);
}

[data-category="operations"] .breakdown-fill {
    background: var(--color-operations);
}

[data-category="other"] .breakdown-fill {
    background: #888888;
}

.breakdown-detail {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-top: 2px;
}

.annual-section {
    background: var(--color-bg-alt);
    margin: 0 calc(-1 * var(--space-lg));
    padding: var(--space-3xl) var(--space-lg);
    margin-bottom: var(--space-3xl);
}

.annual-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
    max-width: 1100px;
    margin: 0 auto var(--space-xl);
}

.annual-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.04);
}

.annual-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.annual-icon {
    font-size: 1.25rem;
}

.annual-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.annual-amount {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.annual-detail {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.annual-total {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: var(--space-lg);
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    max-width: 1100px;
    margin: 0 auto;
}

.annual-total-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.annual-total-amount {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
}

.footer {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.footer p {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto var(--space-sm);
}

.footer-note {
    font-style: italic;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 2rem var(--space-md) var(--space-md);
    }

    .header {
        padding-bottom: var(--space-xl);
        margin-bottom: var(--space-xl);
    }

    /* Smaller assumptions table */
    .assumptions-grid {
        gap: var(--space-sm);
    }

    .assumption-value {
        font-size: 1rem;
    }

    .assumption-label {
        font-size: 0.6rem;
    }

    .assumptions-panel {
        padding: var(--space-md);
        margin-bottom: 0;
    }

    .assumptions-title {
        font-size: 0.7rem;
        margin-bottom: var(--space-sm);
    }

    /* Larger Sankey - much bigger */
    .sankey-section {
        padding: 0;
        margin-top: var(--space-md);
    }

    .sankey-container {
        padding: var(--space-md) var(--space-sm);
        margin: 0;
        border-radius: var(--radius-lg);
        overflow: hidden;
    }

    .sankey-container svg {
        min-height: auto !important;
        width: 100% !important;
        max-width: none;
    }

    .sankey-header {
        padding: 0 var(--space-md);
        margin-bottom: var(--space-md);
    }

    .sankey-header h2 {
        text-align: center;
        font-size: 1.3rem;
    }

    .sankey-header p {
        text-align: left;
        font-size: 0.9rem;
    }

    /* Section titles */
    .section-title {
        font-size: 1.25rem;
    }

    .detail-section {
        margin-top: -var(--space-2xl);
        margin-bottom: var(--space-2xl);
    }

    /* 1-column category cards - concise with details */
    .category-cards {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .category-card {
        padding: var(--space-md);
        border: 1px solid rgba(0, 0, 0, 0.15);
    }

    .card-header {
        flex-direction: row;
        align-items: center;
        gap: var(--space-sm);
    }

    .card-icon {
        width: 28px;
        height: 28px;
    }

    .card-title-group h3 {
        font-size: 0.9rem;
    }

    .card-amount {
        font-size: 0.85rem;
    }

    .card-percent {
        font-size: 0.65rem;
        padding: 2px 6px;
    }

    /* Show breakdown details on mobile */
    .breakdown-detail {
        display: block;
        font-size: 0.7rem;
    }

    .breakdown-header {
        cursor: default;
    }

    .breakdown-name {
        font-size: 0.75rem;
    }

    .breakdown-amount {
        font-size: 0.65rem;
    }

    .opex-note {
        font-size: 0.65rem;
    }

    /* Smaller OPEX amounts */
    .annual-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
    }

    .annual-card {
        padding: var(--space-md);
    }

    .annual-amount {
        font-size: 1rem;
    }

    .annual-label {
        font-size: 0.7rem;
    }

    .annual-detail {
        font-size: 0.6rem;
    }

    .annual-icon {
        font-size: 1rem;
    }

    .annual-total {
        flex-direction: column;
        text-align: center;
        gap: var(--space-sm);
    }

    .annual-total-amount {
        font-size: 1.25rem;
    }

    .investment-banner {
        padding: var(--space-xl) var(--space-lg);
    }
}

@media (max-width: 480px) {
    .assumptions-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .assumption-value {
        font-size: 0.9rem;
    }
}