:root {
            --bg-color: #fefaf9;
            --text-color: hsl(0, 0%, 10%);
            --text-muted: #666666;
            --border-color: #e1e1e1;
            --link-color: #822214;
            --link-hover: #e77728;
            --nav-bg: rgba(254, 250, 249, 0.9);
            --footer-bg: #f8f9fa;
            --nav-accent: #e77728;
            --orange-accent: #e77728;
            --orange-light: #f4a261;
            --font-family: -apple-system, BlinkMacSystemFont, "Inter", "IBM Plex Sans", "Segoe UI", Helvetica, Arial, sans-serif;
            --font-family-mono: "IBM Plex Mono", monospace;
            --font-family-accent: "Gloock", serif;
            --font-weight-normal: 400;
            --font-weight-medium: 500;
            --font-weight-semibold: 600;
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 1.5rem;
            --spacing-xl: 2rem;
            --spacing-xxl: 3rem;
            --max-width: 800px;
            --nav-height: 60px;
            --border-radius: 4px;
            --border-radius-lg: 8px;
            --transition-fast: 0.15s ease;
            --transition-medium: 0.3s ease;
        }

        [data-theme="dark"] {
            --bg-color: #2b2b2c;
            --text-color: #e1e1e1;
            --text-muted: #a1a1a1;
            --border-color: #333333;
            --link-color: #e1e1e1;
            --link-hover: #e77728;
            --nav-bg: rgba(43, 43, 44, 0.9);
            --footer-bg: #1a1a1a;
        }

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

        body {
            font-family: var(--font-family);
            font-weight: var(--font-weight-normal);
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--bg-color);
            overflow-x: hidden;
            transition: background-color var(--transition-medium), color var(--transition-medium);
        }

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

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

        .header h1 {
            font-size: 2.5rem;
            font-weight: var(--font-weight-semibold);
            margin-bottom: var(--spacing-md);
            color: var(--text-color);
        }

        .header p {
            color: var(--text-muted);
            font-size: 1.1rem;
        }

        .mode-selector {
            display: flex;
            justify-content: center;
            gap: var(--spacing-sm);
            margin-bottom: var(--spacing-xl);
            flex-wrap: wrap;
        }

        .mode-btn {
            padding: var(--spacing-sm) var(--spacing-lg);
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            color: var(--text-color);
            border-radius: var(--border-radius-lg);
            cursor: pointer;
            transition: all var(--transition-medium);
            font-size: 14px;
            font-weight: var(--font-weight-medium);
            font-family: var(--font-family);
        }

        .mode-btn:hover {
            border-color: var(--orange-accent);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(231, 119, 40, 0.1);
        }

        .mode-btn.active {
            background: var(--orange-accent);
            color: #fff;
            border-color: var(--orange-accent);
        }

        .calculator-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-xl);
            margin-bottom: var(--spacing-xl);
        }

        .step-label {
            font-size: 11px;
            font-weight: var(--font-weight-semibold);
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--orange-accent);
            margin-bottom: var(--spacing-xs);
        }

        .step-label--muted {
            color: var(--text-muted);
        }

        .results-panel.locked {
            opacity: 0.95;
            pointer-events: none;
        }

        .results-panel {
            transition: opacity 0.3s ease, filter 0.3s ease, border-color var(--transition-medium), box-shadow var(--transition-medium);
        }

        .input-panel, .results-panel {
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            padding: var(--spacing-xl);
            transition: all var(--transition-medium);
        }

        .input-panel:hover, .results-panel:hover {
            border-color: var(--orange-accent);
            box-shadow: 0 4px 12px rgba(231, 119, 40, 0.1);
        }

        .panel-title {
            font-size: 1.4rem;
            font-weight: var(--font-weight-semibold);
            margin-bottom: var(--spacing-lg);
            color: var(--text-color);
        }

        .input-group {
            margin-bottom: var(--spacing-lg);
        }

        .input-group label {
            display: block;
            margin-bottom: var(--spacing-sm);
            color: var(--text-color);
            font-size: 14px;
            font-weight: var(--font-weight-medium);
        }

        .input-field {
            width: 100%;
            padding: var(--spacing-sm) var(--spacing-md);
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            color: var(--text-color);
            font-size: 16px;
            font-family: var(--font-family);
            transition: all var(--transition-fast);
        }

        .input-field:focus {
            outline: none;
            border-color: var(--orange-accent);
            box-shadow: 0 0 0 2px rgba(231, 119, 40, 0.1);
        }

        .slider-group {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }

        .slider {
            flex: 1;
            height: 4px;
            background: var(--border-color);
            border-radius: 2px;
            outline: none;
            -webkit-appearance: none;
            cursor: pointer;
        }

        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 18px;
            height: 18px;
            background: var(--orange-accent);
            border-radius: 50%;
            cursor: pointer;
        }

        .slider::-moz-range-thumb {
            width: 18px;
            height: 18px;
            background: var(--orange-accent);
            border-radius: 50%;
            border: none;
            cursor: pointer;
        }

        .slider-value {
            min-width: 50px;
            text-align: right;
            color: var(--orange-accent);
            font-weight: var(--font-weight-medium);
        }

        .upload-area {
            border: 2px dashed var(--border-color);
            border-radius: var(--border-radius-lg);
            padding: var(--spacing-xl);
            text-align: center;
            cursor: pointer;
            transition: all var(--transition-medium);
            margin-bottom: var(--spacing-lg);
            color: var(--text-muted);
        }

        .upload-area:hover {
            border-color: var(--orange-accent);
            background: rgba(231, 119, 40, 0.05);
            color: var(--text-color);
        }

        .upload-area.drag-over {
            border-color: var(--orange-accent);
            background: rgba(231, 119, 40, 0.1);
            color: var(--text-color);
        }

        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-md) 0;
            border-bottom: 1px solid var(--border-color);
        }

        .result-item:last-child {
            border-bottom: none;
        }

        .result-label {
            color: var(--text-muted);
            font-size: 14px;
        }

        .result-value {
            color: var(--orange-accent);
            font-size: 18px;
            font-weight: var(--font-weight-semibold);
        }

        .chart-container {
            margin-top: var(--spacing-xl);
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius-lg);
            padding: var(--spacing-xl);
            transition: all var(--transition-medium);
        }

        .chart-container:hover {
            border-color: var(--orange-accent);
            box-shadow: 0 4px 12px rgba(231, 119, 40, 0.1);
        }

        .chart-wrapper {
            position: relative;
            height: 400px;
        }

        .advanced-toggle-btn {
            width: 100%;
            background: none;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            padding: var(--spacing-sm) var(--spacing-md);
            color: var(--text-muted);
            font-size: 13px;
            font-family: var(--font-family);
            cursor: pointer;
            text-align: left;
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0;
            transition: border-color var(--transition-fast), color var(--transition-fast);
        }

        .advanced-toggle-btn:hover {
            border-color: var(--orange-accent);
            color: var(--text-color);
        }

        .toggle-chevron {
            font-size: 18px;
            line-height: 1;
            transition: transform 0.2s ease;
        }

        .toggle-chevron.open {
            transform: rotate(90deg);
        }

        .advanced-options {
            display: none;
            border: 1px solid var(--border-color);
            border-top: none;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
            padding: var(--spacing-md);
            margin-bottom: var(--spacing-md);
        }

        .advanced-options.active {
            display: block;
        }

        .monte-carlo-group {
            margin-bottom: 0;
            padding-top: var(--spacing-sm);
            border-top: 1px solid var(--border-color);
        }

        .checkbox-label {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            cursor: pointer;
            font-size: 14px;
            font-weight: var(--font-weight-medium);
        }

        .checkbox-label input[type="checkbox"] {
            width: 16px;
            height: 16px;
            accent-color: var(--orange-accent);
            cursor: pointer;
            flex-shrink: 0;
        }

        .calculate-btn {
            width: 100%;
            padding: var(--spacing-md);
            background: var(--orange-accent);
            color: #fff;
            border: none;
            border-radius: var(--border-radius);
            font-size: 16px;
            font-weight: var(--font-weight-semibold);
            font-family: var(--font-family);
            cursor: pointer;
            transition: all var(--transition-medium);
            margin-top: var(--spacing-lg);
        }

        .calculate-btn:hover {
            background: var(--orange-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(231, 119, 40, 0.3);
        }

        .info-tooltip {
            display: inline-block;
            position: relative;
            margin-left: 6px;
            width: 16px;
            height: 16px;
            background: #888;
            border-radius: 50%;
            text-align: center;
            font-size: 11px;
            line-height: 16px;
            cursor: help;
            color: #fff;
            vertical-align: middle;
        }

        .info-tooltip::after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: calc(100% + 8px);
            left: 50%;
            transform: translateX(-50%);
            background: #222;
            color: #e1e1e1;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 12px;
            line-height: 1.5;
            width: 220px;
            white-space: normal;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.15s ease;
            z-index: 1000;
            font-weight: 400;
            text-transform: none;
            letter-spacing: 0;
        }

        .info-tooltip::before {
            content: '';
            position: absolute;
            bottom: calc(100% + 2px);
            left: 50%;
            transform: translateX(-50%);
            border: 5px solid transparent;
            border-top-color: #222;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.15s ease;
            z-index: 1000;
        }

        .info-tooltip:hover::after,
        .info-tooltip:hover::before {
            opacity: 1;
        }

        .reset-link {
            background: none;
            border: none;
            font-size: 11px;
            color: var(--text-muted);
            cursor: pointer;
            padding: 0;
            font-family: var(--font-family);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .reset-link:hover {
            color: var(--orange-accent);
        }

        .mode-description {
            background: color-mix(in srgb, var(--orange-accent) 8%, transparent);
            border-left: 3px solid var(--orange-accent);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            padding: var(--spacing-sm) var(--spacing-md);
            margin-bottom: var(--spacing-lg);
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .chart-state {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-sm);
            text-align: center;
            padding: var(--spacing-xl);
            color: var(--text-color);
        }

        .chart-state-emoji {
            font-size: 2.5rem;
            line-height: 1;
        }

        .chart-state p {
            font-size: 14px;
            line-height: 1.6;
            max-width: 300px;
            color: var(--text-muted);
        }

        .chart-state strong {
            color: var(--text-color);
        }

        .ghost-bar {
            display: inline-block;
            height: 20px;
            border-radius: 4px;
            background: var(--border-color);
            opacity: 0.5;
        }

        .ghost-bar--sm  { width: 80px; }
        .ghost-bar--md  { width: 110px; }
        .ghost-bar--lg  { width: 140px; }
        .ghost-bar--full { width: 100%; display: block; }

        .result-ghost .result-label {
            color: var(--text-muted);
            opacity: 0.5;
        }

        .ghost-status {
            margin-top: var(--spacing-lg);
            padding: 16px;
            border-radius: 12px;
            border-left: 4px solid var(--border-color);
            background: color-mix(in srgb, var(--border-color) 20%, transparent);
        }

        .chart-placeholder {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-md);
            color: var(--text-muted);
            text-align: center;
            padding: var(--spacing-xl);
        }

        .chart-placeholder svg {
            opacity: 0.15;
        }

        .chart-placeholder p {
            font-size: 14px;
            line-height: 1.6;
            max-width: 280px;
        }

        .chart-placeholder strong {
            display: block;
            font-size: 15px;
            color: var(--text-color);
            margin-bottom: 4px;
        }

        @media (max-width: 768px) {
            .calculator-container {
                grid-template-columns: 1fr;
            }
            
            .mode-selector {
                flex-direction: column;
                align-items: center;
            }
            
            .mode-btn {
                width: 200px;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .input-panel, .results-panel {
                padding: 20px;
            }
        }

        .processing {
            text-align: center;
            color: #00ff88;
            margin-top: 10px;
        }

        .longevity-warning {
            margin-top: 15px;
            padding: 14px 16px;
            border-radius: 8px;
            font-size: 13px;
            line-height: 1.5;
        }

        .longevity-warning.warning {
            background: rgba(255, 165, 0, 0.08);
            border-left: 3px solid #ffa500;
        }

        .longevity-warning.caution {
            background: rgba(255, 107, 107, 0.08);
            border-left: 3px solid #ff6b6b;
        }

        .longevity-warning.ok {
            background: rgba(0, 200, 100, 0.07);
            border-left: 3px solid #00c864;
        }

        .longevity-warning-title {
            font-weight: 600;
            margin-bottom: 6px;
            font-size: 13px;
        }

        .longevity-warning.warning .longevity-warning-title { color: #ffa500; }
        .longevity-warning.caution .longevity-warning-title { color: #ff6b6b; }
        .longevity-warning.ok .longevity-warning-title { color: #00c864; }

        .longevity-warning p {
            margin: 0;
            color: var(--text-muted);
        }

        .success-probability {
            background: color-mix(in srgb, var(--orange-accent) 8%, transparent);
            border-left: 3px solid var(--orange-accent);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            padding: 15px;
            margin-top: 15px;
        }

        .probability-bar {
            width: 100%;
            height: 8px;
            background: var(--border-color);
            border-radius: 4px;
            overflow: hidden;
            margin-top: 10px;
        }

        .probability-fill {
            height: 100%;
            background: var(--orange-accent);
            transition: width 0.5s ease;
        }

        .retirement-status {
            padding: 20px;
            border-radius: 12px;
            margin-top: 20px;
            border-left: 4px solid;
        }

        .retirement-status.achievable {
            background: rgba(231, 119, 40, 0.05);
            border-color: var(--orange-accent);
        }

        .retirement-status.challenging {
            background: rgba(255, 165, 0, 0.05);
            border-color: #ffa500;
        }

        .retirement-status.unrealistic {
            background: rgba(255, 107, 107, 0.05);
            border-color: #ff6b6b;
        }

        .status-icon {
            font-size: 1.5rem;
            margin-right: 10px;
        }

        .status-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
        }

        .suggestions {
            margin-top: 15px;
        }

        .suggestion-item {
            display: flex;
            align-items: center;
            margin-bottom: var(--spacing-sm);
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .suggestion-item::before {
            content: "→";
            margin-right: var(--spacing-sm);
            color: var(--orange-accent);
            font-weight: bold;
        }


        /* Results Animation */
        @keyframes slideInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes countUp {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .result-animated {
            animation: slideInUp 0.6s ease-out;
        }

        .retirement-status.animated {
            animation: slideInUp 0.8s ease-out;
        }

        .chart-container.animated {
            animation: slideInUp 1s ease-out;
        }

        .back-button {
            position: fixed;
            top: 20px;
            left: 20px;
            width: 50px;
            height: 50px;
            background: var(--orange-accent);
            color: #fff;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-medium);
            text-decoration: none;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(231, 119, 40, 0.2);
        }

        .back-button:hover {
            background: var(--link-hover);
            transform: scale(1.05);
            color: #fff;
        }