:root {
            --board-bg: #bbada0;
            --cell-bg: #d7cec4;
            --font-dark: #776e65;
            --font-light: #f9f6f2;
            --bg-color: #faf8ef;
            --drop-target-bg: #e2d9cf;
        }

        body {
            font-family: 'Arial', sans-serif;
            background-color: var(--bg-color);
            color: var(--font-dark);
            display: flex;
            justify-content: center;
            align-items: center; /* центрируем по видимой области */
            /* Use dynamic viewport height to account for mobile browser UI
               --vh is set by JS to window.innerHeight * 0.01px */
            height: calc(var(--vh, 1vh) * 100);
            margin: 0;
            touch-action: none;
            overflow: hidden;
        }

        .version-div{
            /* default absolute positioning (fallback for older layout) */
            position: absolute;
            top: 10px;
            right: 10px;
            font-size: 0.9rem;
            color: var(--font-dark);
            opacity: 0.5;
        }

        /* Top-controls: split into left/center/right so controls can occupy corners and center */
        .top-controls {
            position: absolute;
            top: 6px;
            left: 0;
            right: 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            pointer-events: none; /* allow inner buttons to control events */
            z-index: 60;
            padding: 6px 10px;
        }

        .top-controls > div {
            pointer-events: auto;
            display: flex;
            align-items: center;
        }

        .top-left {
            justify-content: flex-start;
            padding-left: 8px;
        }

        .top-right {
            justify-content: flex-end;
            padding-right: 8px;
        }

        .top-center {
            justify-content: center;
            flex: 1 1 auto;
            pointer-events: none; /* non-interactive center text */
        }

        /* Centered version in top-center */
        .top-center .version-div {
            position: static;
            margin: 0 auto;
            font-size: 0.95rem;
            color: var(--font-dark);
            opacity: 0.9;
            padding: 2px 8px;
            background: rgba(255,255,255,0.02);
            border-radius: 6px;
            /* Make version interactive so users can click to refresh with cache-bust */
            pointer-events: auto;
            cursor: pointer;
            transition: opacity 0.15s, background-color 0.15s;
            width: 32px;
            height: 32px;
            text-align: center;
            padding-top: 14px;
        }

        /* Subtle hover state to indicate clickability */
        .top-center .version-div:hover {
            opacity: 1;
            background: rgba(0,0,0,0.03);
        }

        /* Keep buttons visually in corners with no extra background */
        .top-left .restart-btn,
        .top-right .sound-btn {
            background: none;
            border: none;
            padding: 6px;
            border-radius: 8px;
        }

        /* Responsive tweak: make icons slightly smaller on narrow screens */
        @media (max-width: 420px) {
            .top-left img,
            .top-right img {
                width: 24px;
                height: 24px;
            }
            .top-center .version-div {
                font-size: 0.85rem;
                padding: 1px 6px;
            }
        }

        #game-container {
            position: relative;
            text-align: center;
            padding: 10px;
        }

        h1 {
            font-size: clamp(2rem, 10vw, 3.5rem);
            margin-bottom: 0.5rem;
        }

        #score-container {
            font-size: clamp(1rem, 5vw, 1.5rem);
            margin-bottom: 1rem; /* Увеличим отступ снизу */
            height: 38px; /* Зарезервируем место, чтобы верстка не прыгала */
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        #score-container-left {
            flex: 1;
        }

        /* Inline score and record row */
        .score-row {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            white-space: nowrap;
        }

        .score-label {
            color: var(--font-dark);
            opacity: 0.9;
        }

        .score-value {
            font-weight: 800;
            color: var(--font-dark);
            margin-left: 4px;
        }

        .sep {
            opacity: 0.35;
            margin: 0 6px;
        }
        
        button.restart-btn,
        .sound-btn {
            opacity: 0.6;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background-color 0.2s;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        button.restart-btn img,
        .sound-btn img {
            opacity: 0.7;
            width: 32px;
            height: 32px;
            transition: opacity 0.2s;
        }
        
        button.restart-btn:hover,
        .sound-btn:hover {
            background-color: var(--cell-bg);
        }
        
        .sound-btn.muted {
            opacity: 0.6;
        }
                
        .endcard-button{
            background-color: var(--bg-color);
        }
        /* keep icon size and light transition */
        #restart-btn img,
        .restart-btn img {
            width: 32px;
            height: 32px;
            display: block;
            transition: opacity 0.2s ease;
        }
        
        #score {
            font-weight: bold;
        }

        canvas {
            background-color: var(--board-bg);
            border-radius: 16px;
            display: block;
            cursor: pointer;
        }
        
        #game-over-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(238, 228, 218, 0.73);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            border-radius: 6px;
            animation: fade-in 0.5s;
            text-align: center;
        }
        
        @keyframes fade-in {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        #game-over-overlay h2 {
            font-size: 3rem;
            margin: 0;
        }
        
        #game-over-overlay p {
            font-size: 1.5rem;
        }

        /* Field size modal - make it visually larger and more gamey */
        .field-size-container {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            display: flex;
            flex-direction: column;
            align-items: center;
            background-color: rgb(255, 255, 255);
            padding: 36px; /* larger padding (roughly 2x) */
            border-radius: 16px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.18);
            min-width: 260px; /* wider modal */
            z-index: 40;
        }

        .field-size-container h2 {
            margin: 0 0 18px 0;
            font-size: 1.6rem; /* larger title */
            font-weight: bold;
            color: #5e5e5e;
            text-transform: uppercase;
            letter-spacing: 0.6px;
        }

        .size-btn {
            margin: 12px;
            padding: 14px 28px; /* bigger tappable area */
            font-size: 2.15rem; /* bigger font */
            border-radius: 12px;
            color: #5e5e5e;
            border: none;
            cursor: pointer;
            box-shadow: 0 8px 0 rgba(93, 93, 93, 0.22);
            font-weight: 800;
        }

        .size-btn:active { transform: translateY(3px); box-shadow: 0 6px 0 rgba(0,0,0,0.10); }

        /* restart button style for end-card / overlay only */
        #game-over-overlay #restart-btn {
            padding: 14px 28px;
            font-size: 1.15rem;
            background: linear-gradient(180deg, #7ee8fa 0%, #4da7f5 100%);
            color: #06304a;
            border: none;
            border-radius: 12px;
            cursor: pointer;
            box-shadow: 0 8px 0 rgba(0,0,0,0.12);
            font-weight: 800;
        }
        
        .hidden {
            display: none !important;
        }