/* ===== Site Header / Footer (new design) ===== */
        .site-header {
            background-color: #ffffff;
            display: flex; justify-content: space-between; align-items: center;
            height: 64px; padding: 0 24px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            width: 100%; flex-shrink: 0;
        }
        .site-logo { display: flex; align-items: center; gap: 10px; }
        .site-logo img.bigtoe { height: 60px; width: auto; display: block; }
        .site-logo img.logotext { height: 30px; width: auto; display: block; }
        .site-nav { display: flex; align-items: center; gap: 26px; }
        .site-nav a { text-decoration: none; color: #334155; font-weight: 500; font-size: 0.9rem; transition: color 0.2s; }
        .site-nav a:hover { color: #0d9488; }
        .site-nav a.site-play {
            background: #14b8a6; color: #fff; padding: 8px 18px; border-radius: 999px; font-weight: 600;
        }
        .site-nav a.site-play:hover { background: #0d9488; color: #fff; }
        /* Menu hidden for launch — flip this back to show it */
        .site-nav { display: none; }
        /* Language switch */
        .header-right { display: flex; align-items: center; gap: 8px; margin-left: auto; flex-shrink: 0; }
        .lang-switch { display: flex; gap: 4px; align-items: center; flex-shrink: 0; }
        .lang-switch button {
            border: 1px solid #d5d5d5; background: #fff; color: #555;
            border-radius: 999px; padding: 4px 12px; font-size: 0.8rem;
            font-weight: 600; cursor: pointer; transition: all 0.15s;
        }
        /* Language burger menu (mobile only) */
        .lang-menu { position: relative; }
        .lang-menu-btn {
            display: none;
            border: 1px solid #d5d5d5; background: #fff; color: #555;
            border-radius: 999px; padding: 4px 12px; font-size: 0.8rem;
            font-weight: 600; cursor: pointer; white-space: nowrap;
            transition: all 0.15s;
        }
        .lang-menu-btn:hover { border-color: #0d9488; color: #0d9488; }
        html.dark .lang-menu-btn { background: #1a1a2e; border-color: #3f3f5a; color: #e8e8f0; }
        html.dark .lang-menu-btn:hover { border-color: #14b8a6; color: #5eead4; }
        .lang-switch button:hover { border-color: #0d9488; color: #0d9488; }
        .lang-switch button.active { background: #14b8a6; border-color: #14b8a6; color: #fff; }
        /* Theme toggle (site-wide dark mode) */
        .theme-toggle {
            border: 1px solid #d5d5d5; background: #fff; color: #555;
            border-radius: 999px; padding: 4px 12px; font-size: 0.9rem; line-height: 1.5;
            font-weight: 600; cursor: pointer; transition: all 0.15s; flex-shrink: 0;
        }
        .theme-toggle:hover { border-color: #0d9488; color: #0d9488; }
        .theme-toggle .icon-dark { display: none; }
        /* Site-wide dark theme */
        html.dark .site-header { background: #1a1a2e; box-shadow: 0 2px 5px rgba(0,0,0,0.4); }
        html.dark .site-footer { background: #1a1a2e; border-top-color: #2d2d44; color: #9ca3af; }
        html.dark .site-footer-links a { color: #9ca3af; }
        html.dark .site-footer-links a:hover { color: #5eead4; }
        html.dark .site-nav a { color: #cbd5e1; }
        html.dark .site-nav a:hover { color: #5eead4; }
        html.dark .lang-switch button { background: #1a1a2e; border-color: #3f3f5a; color: #cbd5e1; }
        html.dark .lang-switch button:hover { border-color: #14b8a6; color: #5eead4; }
        html.dark .lang-switch button.active { background: #14b8a6; border-color: #14b8a6; color: #fff; }
        html.dark .theme-toggle { background: #1a1a2e; border-color: #3f3f5a; color: #e8e8f0; }
        html.dark .theme-toggle:hover { border-color: #14b8a6; color: #5eead4; }
        html.dark .theme-toggle .icon-light { display: none; }
        html.dark .theme-toggle .icon-dark { display: inline; }
        /* The wordmark PNG has an opaque white background — invert it in dark mode */
        html.dark .site-logo img.logotext { filter: invert(1) hue-rotate(180deg); }
        .site-footer {
            background-color: #ffffff; border-top: 1px solid #e5e5e5;
            padding: 18px 20px; display: flex; flex-direction: column; align-items: center; gap: 4px;
            font-size: 0.85rem; color: #555; width: 100%; flex-shrink: 0; text-align: center;
        }
        .site-footer-links { display: flex; gap: 20px; }
        .site-footer-links a { text-decoration: none; color: #555; }
        .site-footer-links a:hover { color: #5f9bb9; }
        @media (max-width: 720px) {
            .site-nav { display: none; }
            .site-logo img.bigtoe { height: 44px; }
            .site-logo img.logotext { height: 20px; }
            .lang-menu-btn { display: inline-block; }
            .lang-menu-dd {
                display: none;
                position: absolute; right: 0; top: calc(100% + 8px);
                background: #fff; border: 1px solid #d5d5d5; border-radius: 12px;
                box-shadow: 0 8px 24px rgba(0,0,0,0.15);
                padding: 6px; z-index: 500; min-width: 120px;
            }
            .lang-menu-dd.open { display: block; }
            .lang-menu-dd .lang-switch { flex-direction: column; align-items: stretch; gap: 4px; }
            .lang-menu-dd .lang-switch button { display: block; width: 100%; text-align: left; border: none; }
            html.dark .lang-menu-dd { background: #1a1a2e; border-color: #3f3f5a; }
        }

        /* ===== CSS Variables (Light Mode Default) ===== */
        :root {
            --bg-color: #F5F5F5;
            --surface-color: #FFFFFF;
            --text-color: #212121;
            --text-secondary: #757575;
            --grid-gap: #333333;
            --grid-line-thin: #E0E0E0;
            --grid-line-thick: #333333;
            --cell-bg: #FFFFFF;
            --cell-given: #212121;
            --cell-user: #1565C0;
            --cell-selected-outline: #FFB300;
            --cell-peers-bg: #F0F0F0;
            --cell-same-num-bg: #BBDEFB;
            --cell-error-bg: #FFEBEE;
            --cell-error-text: #E57373;
            --primary: #009688;
            --primary-hover: #00796B;
            --accent: #FFB300;
            --error: #E57373;
            --button-bg: #E0E0E0;
            --button-hover: #BDBDBD;
            --button-active: #009688;
            --button-active-text: #FFFFFF;
            --header-bg: #009688;
            --header-text: #FFFFFF;
            --toolbar-bg: #FFFFFF;
            --numpad-bg: #FFFFFF;
            --shadow: 0 2px 8px rgba(0,0,0,0.1);
            --radius: 8px;
            --transition: 0.2s ease;
        }

        html.dark {
            --bg-color: #121212;
            --surface-color: #1E1E1E;
            --text-color: #E0E0E0;
            --text-secondary: #9E9E9E;
            --grid-gap: #424242;
            --grid-line-thin: #424242;
            --grid-line-thick: #757575;
            --cell-bg: #1E1E1E;
            --cell-given: #FFFFFF;
            --cell-user: #64B5F6;
            --cell-selected-outline: #FFCA28;
            --cell-peers-bg: #2A2A2A;
            --cell-same-num-bg: #1A237E;
            --cell-error-bg: #4E1A1A;
            --cell-error-text: #EF9A9A;
            --button-bg: #333333;
            --button-hover: #424242;
            --button-active: #00BFA5;
            --button-active-text: #121212;
            --header-bg: #1E1E1E;
            --header-text: #E0E0E0;
            --toolbar-bg: #1E1E1E;
            --numpad-bg: #1E1E1E;
            --shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

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

        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            background: var(--bg-color);
            color: var(--text-color);
            min-height: 100dvh;
            display: flex;
            flex-direction: column;
            align-items: center;
            transition: background var(--transition), color var(--transition);
            -webkit-tap-highlight-color: transparent;
            user-select: none;
        }

        .app-container {
            width: 100%;
            max-width: 500px;
            flex: 1;
            padding: 8px 12px 12px;
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            overflow: hidden;
        }

        header {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }
        header h1 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-color);
            line-height: 1.1;
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .btn-icon {
            background: var(--button-bg);
            border: none;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            font-size: 20px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background var(--transition);
        }
        .btn-icon:hover { background: var(--button-hover); }

        .difficulty-bar {
            display: flex;
            gap: 6px;
            width: 100%;
            margin-bottom: 10px;
        }
        .diff-btn {
            flex: 1;
            padding: 8px 4px;
            border: 2px solid var(--button-bg);
            border-radius: var(--radius);
            background: var(--surface-color);
            color: var(--text-color);
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
        }
        .diff-btn.active {
            background: var(--primary);
            color: var(--button-active-text);
            border-color: var(--primary);
        }
        .diff-btn:hover:not(.active) {
            border-color: var(--primary);
            background: var(--cell-same-num-bg);
        }

        .status-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
            min-height: 22px;
            width: 100%;
        }
        .status-row .mistakes,
        .status-row .hints {
            margin-bottom: 0;
        }
        .hints {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            font-weight: 600;
            color: var(--accent);
            margin-left: auto;
        }

        .mistakes {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            font-weight: 600;
            color: var(--error);
            margin-bottom: 8px;
            min-height: 22px;
        }
        .mistake-dot {
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--error);
            display: inline-block;
        }
        .mistake-dot.empty { background: var(--button-bg); }

        .hint-dot {
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--accent);
            display: inline-block;
        }
        .hint-dot.empty { background: var(--button-bg); }

        .grid-wrapper {
            position: relative;
            width: 100%;
            margin-bottom: 8px;
        }
        .grid-loading {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: var(--bg-color);
            border-radius: 4px;
            z-index: 10;
            gap: 12px;
            color: var(--text-secondary);
            font-size: 14px;
        }
        .grid-loading.hidden { display: none; }
        .spinner {
            width: 32px;
            height: 32px;
            border: 3px solid var(--grid-line-thin);
            border-top-color: var(--primary);
            border-radius: 50%;
            animation: spin 0.8s linear infinite;
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        .grid {
            display: grid;
            grid-template-columns: repeat(9, 1fr);
            grid-auto-rows: 1fr;
            aspect-ratio: 1 / 1;
            width: 100%;
            background: var(--grid-gap);
            gap: 1px;
            border: 3px solid var(--grid-line-thick);
            border-radius: 4px;
        }
        .grid.shake {
            animation: shake 0.4s ease-in-out;
        }
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 50%, 90% { transform: translateX(-4px); }
            30%, 70% { transform: translateX(4px); }
        }

        .cell {
            background: var(--cell-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: clamp(18px, 5vw, 26px);
            font-weight: 500;
            cursor: pointer;
            position: relative;
            transition: background 0.15s ease;
        }
        .cell.given {
            font-weight: 700;
            color: var(--cell-given);
        }
        .cell.user {
            color: var(--cell-user);
        }
        .cell.error {
            background: var(--cell-error-bg);
            color: var(--cell-error-text) !important;
        }
        .cell.selected {
            background: var(--cell-same-num-bg);
            z-index: 1;
        }
        .cell.peer {
            background: var(--cell-peers-bg);
        }
        .cell.flash {
            animation: flashPulse 0.2s ease-in-out;
        }
        @keyframes flashPulse {
            0%   { opacity: 1; }
            50%  { opacity: 0.4; }
            100% { opacity: 1; }
        }
        .hint-animation {
            position: fixed;
            font-weight: 900;
            color: var(--accent);
            pointer-events: none;
            z-index: 1000;
            text-shadow: 0 0 12px rgba(255,179,0,0.5);
            transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
        }
        .cell.hint-reveal {
            color: var(--accent) !important;
            animation: hintPulse 0.8s ease-in-out infinite;
        }
        @keyframes hintPulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.2); }
        }
        .cell.same-num {
            background: var(--cell-same-num-bg);
        }
        .cell:nth-child(3n) { border-right: 2px solid var(--grid-line-thick); }
        .cell:nth-child(9n) { border-right: none; }
        .cell:nth-child(n+19):nth-child(-n+27),
        .cell:nth-child(n+46):nth-child(-n+54) { border-bottom: 2px solid var(--grid-line-thick); }

        .notes-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(3, 1fr);
            width: 100%;
            height: 100%;
            padding: 2px;
        }
        .notes-grid span {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: clamp(8px, 2.2vw, 13px);
            color: var(--text-secondary);
            font-weight: 400;
            line-height: 1;
        }

        .toolbar {
            display: flex;
            gap: 6px;
            width: 100%;
            margin-bottom: 8px;
        }
        .tool-btn {
            flex: 1;
            padding: 10px 4px;
            border: 2px solid var(--button-bg);
            border-radius: var(--radius);
            background: var(--surface-color);
            color: var(--text-color);
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 4px;
        }
        .tool-btn:hover {
            border-color: var(--primary);
            background: var(--cell-same-num-bg);
        }
        .tool-btn.active {
            background: var(--primary);
            color: var(--button-active-text);
            border-color: var(--primary);
        }
        .tool-btn:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }
        .tool-btn:disabled:hover {
            border-color: var(--button-bg);
            background: var(--surface-color);
        }
        .tool-btn.new-game {
            background: var(--primary);
            color: var(--button-active-text);
            border-color: var(--primary);
        }
        .tool-btn.new-game:hover {
            background: var(--primary-hover);
            border-color: var(--primary-hover);
        }

        .numpad {
            display: grid;
            grid-template-columns: repeat(9, 1fr);
            grid-auto-rows: 1fr;
            gap: 4px;
            width: 100%;
        }
        .num-btn {
            aspect-ratio: 1;
            border: 2px solid var(--button-bg);
            border-radius: var(--radius);
            background: var(--surface-color);
            color: var(--text-color);
            font-size: clamp(16px, 3.5vw, 20px);
            font-weight: 600;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
            position: relative;
        }
        .num-btn:hover {
            border-color: var(--primary);
            background: var(--cell-same-num-bg);
        }
        .num-btn .remaining {
            font-size: 10px;
            font-weight: 400;
            color: var(--text-secondary);
            margin-top: 1px;
        }
        .num-btn.exhausted {
            opacity: 0.3;
            pointer-events: none;
        }

        .overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 100;
        }
        .overlay.hidden { display: none; }

        .modal {
            background: var(--surface-color);
            border-radius: 12px;
            padding: 32px 24px;
            text-align: center;
            max-width: 340px;
            width: 90%;
            box-shadow: var(--shadow);
        }
        .modal h2 {
            font-size: 24px;
            margin-bottom: 8px;
            color: var(--text-color);
        }
        .modal p {
            color: var(--text-secondary);
            margin-bottom: 20px;
            font-size: 15px;
        }
        .modal button {
            padding: 12px 32px;
            border: none;
            border-radius: var(--radius);
            background: var(--primary);
            color: var(--button-active-text);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition);
        }
        .modal button:hover { background: var(--primary-hover); }

        /* ----- Celebration Overlay ----- */
        .celebration-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.7);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 300;
            overflow: hidden;
        }
        .celebration-overlay.hidden { display: none; }

        .celebration-card {
            background: var(--surface-color);
            border-radius: 20px;
            padding: 40px 32px;
            text-align: center;
            max-width: 400px;
            width: 90%;
            box-shadow: 0 16px 48px rgba(0,0,0,0.3);
            z-index: 1;
            animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }
        @keyframes popIn {
            0% { transform: scale(0.3); opacity: 0; }
            100% { transform: scale(1); opacity: 1; }
        }
        .celebration-card .trophy {
            font-size: 64px;
            animation: bounce 0.6s ease infinite alternate;
        }
        .celebration-card .trophy img {
            width: 140px;
            height: 140px;
            border-radius: 18px;
            object-fit: cover;
            display: block;
            margin: 0 auto;
        }
        @keyframes bounce {
            0% { transform: translateY(0); }
            100% { transform: translateY(-12px); }
        }
        .celebration-card h2 {
            font-size: 32px;
            margin: 12px 0 8px;
            color: var(--primary);
        }
        .celebration-card .stats-row {
            display: flex;
            justify-content: space-around;
            margin: 16px 0;
        }
        .celebration-card .stat {
            text-align: center;
        }
        .celebration-card .stat .val {
            font-size: 28px;
            font-weight: 700;
            color: var(--accent);
        }
        .celebration-card .stat .lbl {
            font-size: 12px;
            color: var(--text-secondary);
        }
        .celebration-card button {
            padding: 14px 40px;
            border: none;
            border-radius: 30px;
            background: var(--primary);
            color: var(--button-active-text);
            font-size: 18px;
            font-weight: 700;
            cursor: pointer;
            margin-top: 16px;
            transition: background var(--transition), transform 0.2s;
        }
        .celebration-card button:hover {
            background: var(--primary-hover);
            transform: scale(1.05);
        }

        /* Confetti */
        .confetti-container {
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 301;
        }
        .confetti-piece {
            position: absolute;
            width: 10px;
            height: 16px;
            top: -20px;
            border-radius: 2px;
            animation: confettiFall linear infinite;
        }
        @keyframes confettiFall {
            0% { transform: translateY(-20px) rotate(0deg); opacity: 1; }
            100% { transform: translateY(105vh) rotate(720deg); opacity: 0; }
        }

        /* ----- Settings Modal ----- */
        .settings-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 200;
        }
        .settings-overlay.hidden { display: none; }

        .settings-modal {
            background: var(--surface-color);
            border-radius: 12px;
            padding: 24px;
            max-width: 380px;
            width: 90%;
            max-height: 85vh;
            overflow-y: auto;
            box-shadow: var(--shadow);
        }
        .settings-modal h2 {
            font-size: 22px;
            margin-bottom: 16px;
            color: var(--text-color);
            text-align: center;
        }
        .settings-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 0;
            border-bottom: 1px solid var(--grid-line-thin);
        }
        .settings-row:last-of-type {
            border-bottom: none;
        }
        .settings-label {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-color);
        }
        .settings-row a.settings-label {
            text-decoration: none;
            color: var(--primary);
            cursor: pointer;
        }
        .settings-row a.settings-label:hover {
            text-decoration: underline;
        }

        /* Toggle Switch */
        .toggle-switch {
            position: relative;
            width: 48px;
            height: 26px;
            flex-shrink: 0;
        }
        .toggle-switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }
        .toggle-slider {
            position: absolute;
            cursor: pointer;
            inset: 0;
            background: var(--button-bg);
            border-radius: 26px;
            transition: background var(--transition);
        }
        .toggle-slider::before {
            content: '';
            position: absolute;
            height: 20px;
            width: 20px;
            left: 3px;
            bottom: 3px;
            background: #fff;
            border-radius: 50%;
            transition: transform var(--transition);
        }
        .toggle-switch input:checked + .toggle-slider {
            background: var(--primary);
        }
        .toggle-switch input:checked + .toggle-slider::before {
            transform: translateX(22px);
        }

        .settings-btn {
            padding: 8px 16px;
            border: 2px solid var(--button-bg);
            border-radius: var(--radius);
            background: var(--surface-color);
            color: var(--text-color);
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
        }
        .settings-btn:hover {
            border-color: var(--primary);
            background: var(--cell-same-num-bg);
        }
        .settings-btn.danger {
            border-color: var(--error);
            color: var(--error);
        }
        .settings-btn.danger:hover {
            background: var(--cell-error-bg);
        }
        .settings-close-btn {
            display: block;
            width: 100%;
            margin-top: 16px;
            padding: 12px;
            border: none;
            border-radius: var(--radius);
            background: var(--primary);
            color: var(--button-active-text);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition);
        }
        .settings-close-btn:hover { background: var(--primary-hover); }

        /* ----- Splash Screen ----- */
        .splash-screen {
            position: absolute;
            inset: 0;
            background: var(--bg-color);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 999;
            transition: opacity 0.5s ease;
        }
        .splash-screen.fade-out {
            opacity: 0;
            pointer-events: none;
        }
        .splash-screen.hidden {
            display: none;
        }
        .splash-logo {
            width: 180px;
            height: auto;
            margin-bottom: 12px;
            animation: splashPulse 2s ease-in-out infinite;
        }
        .splash-logo + .splash-logo {
            width: 140px;
        }
        @keyframes splashPulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }
        .splash-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-color);
            letter-spacing: 1px;
            margin-bottom: 4px;
        }
        .splash-subtitle {
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 12px;
            font-weight: 400;
        }
        .splash-publisher {
            margin-top: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .splash-copyright {
            position: absolute;
            bottom: 20px;
            font-size: 11px;
            color: var(--text-secondary);
        }

        /* ----- Header Branding ----- */
        .header-brand {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-logo {
            height: 36px;
            width: auto;
            flex-shrink: 0;
        }
        .header-text {
            display: flex;
            flex-direction: column;
        }
        .header-text .publisher {
            font-size: 10px;
            color: var(--text-secondary);
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        /* ----- Settings Branding ----- */
        .settings-branding {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding-top: 14px;
            margin-top: 8px;
            border-top: 1px solid var(--grid-line-thin);
        }
        .settings-branding img {
            width: 22px;
            height: 22px;
        }
        .settings-branding span {
            font-size: 12px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        @media (max-width: 380px) {
            .difficulty-bar { gap: 3px; }
            .diff-btn { font-size: 11px; padding: 6px 2px; }
            .toolbar { gap: 4px; }
            .tool-btn { font-size: 11px; padding: 8px 2px; }
            .splash-logo { width: 140px; }
            .splash-title { font-size: 24px; }
        }