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

        :root {
            --accent: #8a5a3c;
            --accent-2: #2f6b4f;
            --panel-bg: rgba(255, 255, 255, 0.66);
            --panel-border: rgba(0, 0, 0, 0.12);
            --text-main: #262626;
            --text-dim: #5a5a5a;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            color: var(--text-main);
            padding: 40px 20px;
            background-image: linear-gradient(160deg, #f3ede3 0%, #eef4ec 45%, #eaf1ee 100%);
            background-attachment: fixed;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
        }

        .panel {
            background: var(--panel-bg);
            border: 1px solid var(--panel-border);
            backdrop-filter: blur(14px);
            border-radius: 16px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
        }

        header {
            text-align: center;
            margin-bottom: 36px;
        }

        header h1 {
            font-size: 2.4em;
            font-weight: 800;
            background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: 0.5px;
        }

        header p.subtitle {
            color: var(--text-dim);
            margin-top: 8px;
            font-size: 1.05em;
        }

        header p.intro {
            position: relative;
            max-width: 620px;
            margin: 28px auto 0;
            padding-top: 22px;
            font-size: 1.05em;
            line-height: 1.7;
            color: var(--text-dim);
        }

        header p.intro::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 52px;
            height: 3px;
            border-radius: 2px;
            background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
        }

        header p.intro strong {
            color: var(--text-main);
            font-weight: 600;
        }

        .how-it-works {
            padding: 24px;
            margin-bottom: 24px;
        }

        .how-it-works h2 {
            font-size: 1em;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--accent);
            margin-bottom: 10px;
            font-weight: 700;
        }

        .how-it-works ol {
            margin: 0;
            padding-left: 1.4em;
            color: var(--text-dim);
            line-height: 1.6;
            font-size: 0.95em;
        }

        .how-it-works li {
            margin-bottom: 8px;
        }

        .how-it-works .conclusion {
            margin-top: 14px;
            font-style: italic;
            color: var(--text-dim);
            line-height: 1.6;
            font-size: 0.95em;
        }

        .main-grid {
            display: grid;
            grid-template-columns: 2.3fr 1fr;
            align-items: start;
            gap: 24px;
            margin-bottom: 24px;
        }

        .chart-panel {
            padding: 22px 24px;
            position: relative;
            min-width: 0;
        }

        .detail-panel {
            display: flex;
            flex-direction: column;
            padding: 22px 24px;
        }

        .controls-bar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            height: 40px;
            background: var(--accent);
            color: white;
            border: none;
            padding: 0 16px;
            border-radius: 999px;
            font-size: 0.85em;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.2s ease;
        }

        .btn:hover {
            opacity: 0.85;
        }

        .btn.secondary {
            background: rgba(0, 0, 0, 0.07);
            color: var(--text-main);
        }

        /* Icons are inline SVGs (Lucide), not Unicode glyphs or translated
           words — glyphs like ↻ render inconsistently across fonts
           and languages (e.g. a CJK font substitution under lang="ja"). */
        .icon-btn {
            width: 40px;
            height: 40px;
            padding: 0;
            justify-content: center;
            flex-shrink: 0;
        }

        .icon-btn svg {
            width: 18px;
            height: 18px;
        }

        .pill-toggle {
            display: inline-flex;
            height: 40px;
            background: rgba(0, 0, 0, 0.06);
            border-radius: 999px;
            padding: 3px;
            gap: 2px;
        }

        .pill-toggle button {
            display: flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            border: none;
            color: var(--text-dim);
            font-size: 0.8em;
            font-weight: 700;
            padding: 0 12px;
            border-radius: 999px;
            cursor: pointer;
            transition: background 0.2s ease, color 0.2s ease;
        }

        .pill-toggle button:hover {
            color: var(--text-main);
        }

        .pill-toggle button[aria-pressed="true"] {
            background: white;
            color: var(--accent);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
        }

        .pill-toggle.icon-pill button {
            width: 34px;
            padding: 0;
        }

        .pill-toggle.icon-pill svg {
            width: 18px;
            height: 18px;
        }

        .spacer {
            flex: 1;
        }

        /* --- Chart (dataviz-skill palette, scoped to this subtree only) --- */
        .viz-root {
            color-scheme: light;
            --surface-1: #fcfcfb;
            --ink-primary: #0b0b0b;
            --ink-secondary: #52514e;
            --ink-muted: #898781;
            --gridline: #e1e0d9;
            --series-1: #2a78d6;
            --series-2: #eb6834;
            --series-3: #1baf7a;
            --series-4: #eda100;
            --series-5: #e87ba4;
            --series-6: #008300;
            --series-7: #4a3aa7;
            --series-8: #e34948;
            --series-9: #0657ac;
            --series-10: #c24709;
            --series-11: #07895e;
            --series-12: #c08208;
            --series-13: #c25983;
            --series-14: #066805;
            --series-15: #4e3fad;
            --series-16: #bc1e27;
            --series-17: #4e9bfc;
            --series-18: #fe885d;
            --series-19: #44c992;
            --series-20: #e69d0c;
            --series-other: #b5b3a8;
        }

        @media (prefers-color-scheme: dark) {
            :root:where(:not([data-theme="light"])) .viz-root {
                color-scheme: dark;
                --surface-1: #1a1a19;
                --ink-primary: #ffffff;
                --ink-secondary: #c3c2b7;
                --ink-muted: #898781;
                --gridline: #2c2c2a;
                --series-1: #3987e5;
                --series-2: #d95926;
                --series-3: #199e70;
                --series-4: #c98500;
                --series-5: #d55181;
                --series-6: #008300;
                --series-7: #9085e9;
                --series-8: #e66767;
                --series-9: #4290ef;
                --series-10: #e36230;
                --series-11: #29a778;
                --series-12: #c18003;
                --series-13: #df5a89;
                --series-14: #3aa535;
                --series-15: #8a7fe2;
                --series-16: #df6161;
                --series-17: #0e65c0;
                --series-18: #ad3c05;
                --series-19: #087954;
                --series-20: #9d6805;
                --series-other: #52514e;
            }
        }

        :root[data-theme="dark"] .viz-root {
            color-scheme: dark;
            --surface-1: #1a1a19;
            --ink-primary: #ffffff;
            --ink-secondary: #c3c2b7;
            --ink-muted: #898781;
            --gridline: #2c2c2a;
            --series-1: #3987e5;
            --series-2: #d95926;
            --series-3: #199e70;
            --series-4: #c98500;
            --series-5: #d55181;
            --series-6: #008300;
            --series-7: #9085e9;
            --series-8: #e66767;
            --series-9: #4290ef;
            --series-10: #e36230;
            --series-11: #29a778;
            --series-12: #c18003;
            --series-13: #df5a89;
            --series-14: #3aa535;
            --series-15: #8a7fe2;
            --series-16: #df6161;
            --series-17: #0e65c0;
            --series-18: #ad3c05;
            --series-19: #087954;
            --series-20: #9d6805;
            --series-other: #52514e;
        }

        #chartSvgWrap,
        #individualViewWrap {
            background: var(--surface-1);
            border-radius: 12px;
            position: relative;
        }

        #chartSvg {
            display: block;
            width: 100%;
            height: 360px;
        }

        #individualCanvas {
            display: block;
            width: 100%;
            height: 360px;
        }

        #chartSvg .area {
            stroke: var(--surface-1);
            stroke-width: 0.75;
            transition: opacity 0.15s ease, fill 5s ease;
        }

        #chartSvg .crosshair {
            stroke: var(--ink-muted);
            stroke-width: 1;
            stroke-dasharray: 3 3;
            display: none;
        }

        #chartSvg .century-line {
            stroke: var(--ink-muted);
            stroke-width: 1;
            stroke-dasharray: 4 4;
            opacity: 0.5;
        }

        #chartTooltip,
        #individualTooltip {
            position: absolute;
            display: none;
            background: var(--surface-1);
            color: var(--ink-primary);
            border: 1px solid var(--gridline);
            border-radius: 8px;
            padding: 8px 10px;
            font-size: 0.78em;
            line-height: 1.5;
            pointer-events: none;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
            z-index: 10;
            white-space: nowrap;
        }

        #chartTooltip .row,
        #individualTooltip .row {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        #chartTooltip .swatch,
        #individualTooltip .swatch {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            flex-shrink: 0;
        }

        .table-scroll {
            height: 360px;
            overflow: auto;
            border-radius: 12px;
            background: var(--surface-1);
        }

        .chart-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.78em;
        }

        .chart-table th,
        .chart-table td {
            padding: 5px 8px;
            text-align: right;
            white-space: nowrap;
            border-bottom: 1px solid var(--panel-border);
            font-variant-numeric: tabular-nums;
        }

        .chart-table thead th {
            position: sticky;
            top: 0;
            background: var(--surface-1);
            z-index: 1;
        }

        .chart-table th:first-child,
        .chart-table td:first-child {
            text-align: left;
            position: sticky;
            left: 0;
            background: var(--surface-1);
            z-index: 1;
        }

        .chart-table thead th:first-child {
            z-index: 2;
        }

        /* Row backgrounds — the ">"+"*" form (rather than nth-child, which
           would miscount once the population row's fixed position 1 is
           mixed in) reaches every cell in the row, including the sticky
           first column, which otherwise keeps its own hardcoded surface
           color and wouldn't stripe/tint along with the rest of the row. */
        .chart-table tbody tr.row-odd > * {
            background: rgba(0, 0, 0, 0.03);
        }

        .chart-table tbody tr.population-row > * {
            background: var(--gridline);
            font-weight: 600;
        }

        /* Mirrors legend-hover focus onto the matching table row. Placed
           after .row-odd (same specificity — "> *" vs "> *" — so source
           order is the tiebreaker) so it wins when both classes land on
           the same row. */
        .chart-table tbody tr.row-focused > * {
            background: rgba(138, 90, 60, 0.18);
        }

        /* --- HUD + legend (detail panel) --- */
        .hud {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            margin-bottom: 18px;
        }

        .hud-stat {
            background: rgba(0, 0, 0, 0.04);
            border-radius: 10px;
            padding: 8px 10px;
            text-align: center;
        }

        .hud-stat .value {
            font-size: 1.2em;
            font-weight: 700;
            font-variant-numeric: tabular-nums;
        }

        .hud-stat .label {
            font-size: 0.68em;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-dim);
        }

        .leading-now {
            font-size: 0.82em;
            color: var(--text-dim);
            margin-bottom: 12px;
            text-align: center;
        }

        .legend-title {
            font-size: 0.8em;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 8px;
        }

        .legend-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
            min-height: 0;
            overflow-y: auto;
        }

        .legend-list li {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 5px 8px;
            border-radius: 6px;
            font-size: 0.88em;
            transition: opacity 0.15s ease;
        }

        .legend-list li:nth-child(odd) {
            background: rgba(0, 0, 0, 0.03);
        }

        .legend-list li[data-surname]:hover {
            background: rgba(0, 0, 0, 0.08);
        }

        .legend-list li.dimmed {
            opacity: 0.35;
        }

        .legend-swatch {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            flex-shrink: 0;
            transition: background-color 5s ease;
        }

        .legend-name {
            flex: 1;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .legend-pct {
            font-variant-numeric: tabular-nums;
            color: var(--text-dim);
        }

        /* --- Banners / toasts --- */
        .banner {
            display: none;
            position: absolute;
            inset: 0;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(4px);
            border-radius: 12px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 14px;
            text-align: center;
            padding: 24px;
            z-index: 5;
        }

        .banner.visible {
            display: flex;
        }

        .banner h3 {
            font-size: 1.3em;
        }

        .banner p {
            color: var(--text-dim);
            max-width: 420px;
        }

        .banner .banner-actions {
            display: flex;
            gap: 10px;
        }

        .toast {
            position: absolute;
            bottom: 16px;
            left: 50%;
            transform: translateX(-50%) translateY(0);
            background: var(--text-main);
            color: white;
            padding: 10px 18px;
            border-radius: 999px;
            font-size: 0.85em;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease, transform 0.3s ease;
            z-index: 6;
            white-space: nowrap;
        }

        .toast.visible {
            opacity: 1;
            transform: translateX(-50%) translateY(-6px);
        }

        .confirm-inline {
            display: none;
            position: absolute;
            inset: 0;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(4px);
            border-radius: 12px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 14px;
            text-align: center;
            padding: 24px;
            z-index: 5;
        }

        .confirm-inline.visible {
            display: flex;
        }

        #langToggle {
            margin-bottom: 12px;
        }

        footer {
            text-align: center;
            margin-top: 36px;
            padding-top: 22px;
            border-top: 1px solid var(--panel-border);
            color: var(--text-dim);
            font-size: 0.85em;
        }

        footer a {
            color: var(--accent);
            font-weight: 600;
            text-decoration: none;
        }

        footer a.source-link svg {
            width: 14px;
            height: 14px;
            fill: currentColor;
            vertical-align: -2px;
            margin-right: 3px;
        }

        footer a:hover {
            text-decoration: underline;
        }

        @media screen and (max-width: 860px) {
            .main-grid {
                grid-template-columns: 1fr;
            }

            /* The detail panel isn't height-synced to the chart on a single
               mobile column, so without a cap the full surname list (up to
               ~200 entries once "Other" is gone) would run on forever —
               show roughly 10 rows and let the rest scroll. */
            .legend-list {
                max-height: 320px;
            }
        }

        @media screen and (max-width: 768px) {
            header h1 {
                font-size: 1.8em;
            }

            /* .controls-bar's groups (play/reset, speed, dataset, view) are
               each a different natural width, so once flex-wrap stacks them
               onto their own lines, left-aligning (the desktop default)
               makes them look staggered/uneven — center every wrapped line
               instead. The spacer only exists to push dataset/view to the
               right of speed on a single wide row; once wrapped there's no
               "right" to push to, so it'd just be a stray empty line. */
            .controls-bar {
                justify-content: center;
            }

            .spacer {
                display: none;
            }
        }