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

        :root {
            --accent: #d80027;
            --accent-2: #0052b4;
            --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;
            /* A soft wash of the flag-legend hues (red/gold/blue/green) — a nod to "a touch of color" without competing with the map's own vivid stripes. */
            background-image: linear-gradient(160deg, #fdeaea 0%, #fdf6e3 30%, #eef4fb 65%, #eef8ee 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;
            position: relative;
        }

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

        .intro-wrap {
            position: relative;
            margin: 28px auto 0;
            padding-top: 22px;
        }

        .intro-wrap::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 {
            font-size: 1.08em;
            line-height: 1.7;
            color: var(--text-dim);
            margin: 0;
        }

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

        .mode-toggle-row {
            display: flex;
            justify-content: center;
            margin-bottom: 24px;
        }

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

        .map-panel {
            position: relative;
            padding: 22px 24px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        /* Floats over the bottom-right corner of the map (Same-color mode's
           legend sits at the top, so the controls would otherwise cover it). */
        .zoom-controls {
            position: absolute;
            bottom: 16px;
            right: 16px;
            z-index: 2;
            display: flex;
            flex-direction: column;
            background: var(--panel-bg);
            border: 1px solid var(--panel-border);
            border-radius: 10px;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
            overflow: hidden;
        }

        .zoom-controls button {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: none;
            background: transparent;
            color: var(--text-main);
            font-size: 1.15em;
            font-weight: 700;
            line-height: 1;
            cursor: pointer;
            transition: background 0.15s ease;
        }

        .zoom-controls button:not(:last-child) {
            border-bottom: 1px solid var(--panel-border);
        }

        .zoom-controls button:hover:not(:disabled) {
            background: rgba(0, 0, 0, 0.06);
        }

        .zoom-controls button:disabled {
            opacity: 0.35;
            cursor: default;
        }

        /* Fixed-size viewport: zoom scales/pans #svg_map via transform inside
           here rather than growing its own box, so this panel's (and the
           detail panel's, kept in sync with it) height never changes. */
        #world-map {
            position: relative;
            overflow: hidden;
            aspect-ratio: 2754 / 1398;
            touch-action: none;
        }

        #world-map.zoomed {
            cursor: grab;
        }

        #world-map.dragging {
            cursor: grabbing;
        }

        #svg_map {
            /* SVGs default to inline display, which reserves a few px of
               descender space below them (like text) — inside #world-map's
               tightly fitted aspect-ratio box, that shows up as the map
               sitting slightly above center instead of filling it exactly. */
            display: block;
            transform-origin: center center;
            transition: transform 0.15s ease;
        }

        #svg_map.no-transition {
            transition: none;
        }

        #map-legend {
            width: 100%;
            display: flex;
            justify-content: center;
            margin-bottom: 16px;
        }

        /* Blend mode colors every country itself — the 13-swatch legend (for
           filtering by the simplified Same-color palette) doesn't apply. */
        .container.blend-mode #map-legend {
            display: none;
        }

        #map-legend .legend-item {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px 18px;
            width: 90%;
        }

        #map-legend .legend-color {
            width: 20px;
            height: 20px;
            display: inline-block;
            border-radius: 25%;
            border: 1px solid #333;
            opacity: 0.35;
            cursor: pointer;
        }

        #map-legend .legend-color:hover {
            opacity: 1;
            outline: 2px solid red;
        }

        .active-high-opacity {
            opacity: 1 !important;
            outline: 2px solid red !important;
        }

        #map-legend .legend-clear {
            background: #fff;
            border: 1px dashed rgba(0, 0, 0, 0.4);
            opacity: 1;
            color: var(--accent);
            font-size: 11px;
            font-weight: 800;
            line-height: 1;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        #map-legend .legend-clear:hover {
            border-color: var(--accent);
            border-style: solid;
            background: #fdeaea;
        }

        #world-map path, #world-map circle {
            fill: #ccc;
            stroke: white;
            stroke-width: 1;
            opacity: 1;
            cursor: pointer;
        }

        .detail-panel {
            display: flex;
            flex-direction: column;
            padding: 22px 24px;
            /* No fixed height: .main-grid's default stretch alignment matches this to .map-panel's actual (fluid) height. */
        }

        .detail-placeholder {
            margin: auto;
            text-align: center;
            color: var(--text-dim);
            font-size: 0.95em;
            line-height: 1.6;
            padding: 20px;
        }

        .detail-content {
            display: flex;
            flex-direction: column;
            flex: 1;
            min-height: 0;
        }

        .detail-flag {
            display: block;
            margin: 0 auto 16px;
            border-radius: 50%;
            object-fit: cover;
            border: 1px solid var(--panel-border);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
        }

        .detail-country-name {
            text-align: center;
            font-size: 1.3em;
            margin-bottom: 16px;
            color: var(--text-main);
        }

        /* Blend mode: real flag (its own natural shape/aspect, not cropped to a
           circle) -> shuffle arrow -> a same-shaped swatch of the blended color,
           stacked top-to-bottom. */
        .detail-blend-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 14px;
            flex: 1;
            min-height: 0;
            margin: auto;
        }

        .blend-col {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            min-width: 0;
        }

        .blend-flag {
            display: block;
            border-radius: 4px;
            border: 1px solid var(--panel-border);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
        }

        .blend-arrow-wrap {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: transparent;
            flex-shrink: 0;
        }

        .blend-arrow {
            width: 20px;
            height: 20px;
            stroke: #000;
            transform: rotate(90deg);
        }

        #blendRgbLabel {
            font-variant-numeric: tabular-nums;
        }

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

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

        .detail-similar-list li {
            font-size: 0.92em;
            color: var(--text-dim);
            padding: 4px 8px;
            border-radius: 6px;
        }

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

        .detail-similar-list li.detail-country-item {
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            transition: background 0.15s ease;
        }

        .detail-similar-list li.detail-country-item:hover {
            background: rgba(0, 0, 0, 0.07);
            color: var(--text-main);
        }

        .detail-list-flag {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            object-fit: cover;
            flex-shrink: 0;
        }

        .lang-toggle {
            display: inline-flex;
            background: rgba(0, 0, 0, 0.06);
            border-radius: 999px;
            padding: 3px;
            gap: 2px;
            margin-bottom: 12px;
        }

        .lang-toggle button {
            background: transparent;
            border: none;
            color: var(--text-dim);
            font-size: 0.8em;
            font-weight: 700;
            padding: 6px 12px;
            border-radius: 999px;
            cursor: pointer;
            transition: background 0.2s ease, color 0.2s ease;
        }

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

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

        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;
            }
        }

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

            #map-legend .legend-item {
                width: 100%;
            }
        }