* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

:root {
    --nes-black: #000000;
    --nes-white: #FFFFFF;
    --nes-blue: #5C94FC;
    --nes-red: #FC5454;
    --nes-green: #00FF00;
    --nes-gray: #7C7C7C;
}

body {
    font-family: 'Press Start 2P', monospace;
    background-color: var(--nes-black);
    color: var(--nes-white);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    position: fixed;
    overscroll-behavior: none;
}

#app {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    padding: 0;
    overflow: hidden;
    position: relative;
}

/* Screen Management */
.screen {
    display: none;
    width: 100%;
    height: 100%;
}

.screen.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.screen.overlay {
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 100;
}

/* Menu Screen */
.menu-container {
    text-align: center;
}

.game-title {
    font-size: 3rem;
    margin-bottom: 4rem;
    color: var(--nes-blue);
    letter-spacing: 0.2em;
    text-shadow: 4px 4px 0px var(--nes-gray);
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.menu-btn {
    padding: 1rem 2rem;
    font-size: 0.9rem;
    font-family: 'Press Start 2P', monospace;
    background-color: var(--nes-black);
    color: var(--nes-white);
    border: 4px solid var(--nes-white);
    cursor: pointer;
    transition: all 0.1s ease;
    text-transform: uppercase;
    position: relative;
}

.menu-btn:hover {
    background-color: var(--nes-white);
    color: var(--nes-black);
}

.menu-btn:active {
    transform: translate(2px, 2px);
}

.menu-btn.secondary {
    border-color: var(--nes-gray);
    color: var(--nes-gray);
}

.menu-btn.secondary:hover {
    background-color: var(--nes-gray);
    color: var(--nes-black);
}

.menu-btn.small {
    padding: 0.6rem 1.2rem;
    font-size: 0.7rem;
}

/* Lobby Screen */
.lobby-container {
    text-align: center;
    padding: 2rem;
    min-width: 500px;
}

.lobby-container h2 {
    font-size: 1.5rem;
    color: var(--nes-blue);
    margin-bottom: 2rem;
}

.lobby-info {
    margin: 2rem 0;
    font-size: 0.8rem;
    line-height: 2;
}

.lobby-info p {
    margin: 1rem 0;
    color: var(--nes-white);
}

.room-code-clickable {
    color: var(--nes-green);
    cursor: pointer;
    padding: 0.5rem 1rem;
    border: 3px solid var(--nes-green);
    background-color: var(--nes-black);
    font-size: 1.2rem;
    transition: all 0.1s;
    display: inline-block;
}

.room-code-clickable:hover {
    background-color: var(--nes-green);
    color: var(--nes-black);
}

.room-code-clickable:active {
    transform: translate(2px, 2px);
}

.copy-hint {
    font-size: 0.6rem;
    color: var(--nes-gray);
    margin-left: 0.5rem;
}

.lobby-buttons {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.room-input {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.room-input input {
    padding: 1rem;
    font-size: 1.2rem;
    font-family: 'Press Start 2P', monospace;
    background-color: var(--nes-black);
    color: var(--nes-white);
    border: 4px solid var(--nes-white);
    text-align: center;
    text-transform: uppercase;
}

.room-input input:focus {
    outline: none;
    border-color: var(--nes-blue);
}

.hidden {
    display: none !important;
}

/* Game Screen - NES Layout */
.game-container {
    display: flex;
    gap: 4rem;
    align-items: center;
    justify-content: center;
}

.player-area {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* NES-style layout: stats on top, canvas in middle, next piece below */
.nes-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

/* Stats at the top in a single row */
.game-stats-top {
    width: 300px;
    background-color: var(--nes-black);
    border: 4px solid var(--nes-white);
    padding: 0.8rem;
    box-shadow: 6px 6px 0px var(--nes-gray);
}

.stats-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.2rem;
}

.stat-group {
    flex: 1;
    text-align: center;
}

.stat-label {
    font-size: 0.5rem;
    color: var(--nes-blue);
    margin-bottom: 0.4rem;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 0.9rem;
    color: var(--nes-white);
    letter-spacing: 0.05em;
}

.score-diff {
    font-size: 0.45rem;
    margin-top: 0.3rem;
    display: block;
}

.score-diff.positive {
    color: var(--nes-green);
}

.score-diff.negative {
    color: var(--nes-red);
}

.score-diff.neutral {
    color: var(--nes-gray);
}

/* Next piece preview box at the bottom */
.game-stats-bottom {
    width: 300px;
    background-color: var(--nes-black);
    border: 4px solid var(--nes-white);
    padding: 0.8rem;
    box-shadow: 6px 6px 0px var(--nes-gray);
    text-align: center;
}

.game-stats-bottom .stat-label {
    font-size: 0.5rem;
    color: var(--nes-blue);
    margin-bottom: 0.6rem;
    letter-spacing: 0.1em;
}

.game-stats-bottom canvas {
    width: 120px;
    height: 120px;
    image-rendering: pixelated;
    margin: 0 auto;
    display: block;
}

.canvas-wrapper {
    position: relative;
    border: 4px solid var(--nes-white);
    background-color: var(--nes-black);
    box-shadow: 8px 8px 0px var(--nes-gray);
}

canvas {
    display: block;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.countdown {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 6rem;
    font-weight: 700;
    color: var(--nes-red);
    z-index: 10;
    text-shadow: 4px 4px 0px var(--nes-black);
}

.vs-divider {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: var(--nes-red);
    letter-spacing: 0.2em;
}

.controls-info {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    font-size: 0.5rem;
    color: var(--nes-gray);
    background: var(--nes-black);
    border: 3px solid var(--nes-gray);
    padding: 1rem 1.5rem;
    line-height: 2;
}

.controls-info p {
    margin: 0.5rem 0;
}

.control-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 0.8rem;
}

#btn-toggle-sound {
    min-width: 100px;
}

#btn-toggle-sound.muted {
    color: var(--nes-red);
    border-color: var(--nes-red);
}

/* Mobile control buttons overlay */
.mobile-controls {
    display: none;
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    gap: 0.5rem;
    z-index: 20;
}

.mobile-btn {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.2rem;
    background-color: rgba(0, 0, 0, 0.7);
    color: var(--nes-white);
    border: 2px solid var(--nes-white);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.1s;
}

.mobile-btn:active {
    background-color: var(--nes-white);
    transform: scale(0.95);
}

.mobile-btn.muted {
    color: var(--nes-red);
    border-color: var(--nes-red);
}

/* Mobile optimizations - hide opponent and controls info */
@media (max-width: 768px) {
    html, body {
        width: 100%;
        height: 100vh;
        height: -webkit-fill-available;
        margin: 0;
        padding: 0;
        overflow: hidden;
        position: fixed;
        overscroll-behavior: none;
        -webkit-overflow-scrolling: touch;
    }

    #player2-area {
        display: none !important;
    }

    #vs-divider {
        display: none !important;
    }

    /* Hide desktop controls info completely on mobile */
    .controls-info {
        display: none !important;
    }

    /* Show mobile control buttons */
    .mobile-controls {
        display: flex !important;
    }

    /* Full screen game on mobile */
    #app {
        padding: 0;
        margin: 0;
        width: 100vw;
        height: 100vh;
        height: -webkit-fill-available;
    }

    .screen {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
    }

    .game-container {
        width: 100vw;
        height: 100vh;
        height: -webkit-fill-available;
        padding: 0.5rem 0;
        margin: 0;
        gap: 0.3rem;
        justify-content: flex-start;
        align-items: center;
        display: flex;
        flex-direction: column;
    }

    .player-area {
        width: 100%;
        height: 100%;
        max-width: 100%;
        display: flex;
        flex-direction: column;
        margin: 0;
        padding: 0;
    }

    .nes-layout {
        width: 100%;
        height: 100%;
        gap: 0.3rem;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        padding: 0;
        margin: 0;
    }

    .game-stats-top {
        width: 100%;
        max-width: 100%;
        flex-shrink: 0;
        margin: 0;
        padding: 0.5rem;
        border: 3px solid var(--nes-white);
        box-shadow: none;
    }

    .game-stats-bottom {
        width: 100%;
        max-width: 100%;
        flex-shrink: 0;
        margin: 0;
        padding: 0.4rem;
        border: 3px solid var(--nes-white);
        box-shadow: none;
    }

    .canvas-wrapper {
        box-shadow: none;
        border: 3px solid var(--nes-white);
        flex-grow: 0;
        flex-shrink: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        position: relative;
        margin: 0;
        padding: 0;
        min-height: 0;
        overflow: hidden;
    }

    .canvas-wrapper canvas {
        width: 100% !important;
        height: auto !important;
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
        margin: 0;
        padding: 0;
    }

    /* Increase stats font size */
    .stat-label {
        font-size: 0.5rem !important;
    }

    .stat-value {
        font-size: 0.9rem !important;
    }

    .score-diff {
        font-size: 0.45rem !important;
    }

    .game-stats-bottom .stat-label {
        font-size: 0.5rem !important;
    }

    .game-stats-bottom canvas {
        width: 80px !important;
        height: 80px !important;
        display: block !important;
    }
}

/* Pause Screen */
.pause-container {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.pause-container h2 {
    font-size: 3rem;
    color: var(--nes-blue);
    letter-spacing: 0.2em;
}

/* Game Over Screen */
.gameover-container {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2rem;
}

#gameover-title {
    font-size: 2.5rem;
    color: var(--nes-red);
    letter-spacing: 0.1em;
}

#gameover-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0;
}

.final-stat {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    font-size: 0.9rem;
}

.winner {
    margin: 2rem 0;
    padding: 2rem;
    border: 4px solid var(--nes-green);
    background-color: var(--nes-black);
}

#winner-text {
    font-size: 1.5rem;
    color: var(--nes-green);
    line-height: 1.8;
}

/* Settings Screen */
.settings-container {
    text-align: center;
    padding: 2rem;
    min-width: 500px;
}

.settings-container h2 {
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--nes-blue);
}

.settings-options {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    font-size: 0.7rem;
    padding: 1rem;
    border: 3px solid var(--nes-gray);
}

.setting-item label {
    color: var(--nes-white);
}

.setting-item input[type="range"] {
    width: 150px;
}

.setting-item input[type="checkbox"] {
    width: 30px;
    height: 30px;
    cursor: pointer;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        overflow: hidden;
    }

    .game-title {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }

    .menu-btn {
        font-size: 0.7rem;
        padding: 0.8rem 1.5rem;
    }

    .game-stats-top,
    .game-stats-bottom {
        padding: 0.5rem;
        box-shadow: 3px 3px 0px var(--nes-gray);
        border: 3px solid var(--nes-white);
    }

    .stats-row {
        gap: 0.6rem;
    }

    .stat-label {
        font-size: 0.45rem;
        margin-bottom: 0.3rem;
    }

    .stat-value {
        font-size: 0.8rem;
    }

    .score-diff {
        font-size: 0.4rem;
    }

    .game-stats-bottom {
        padding: 0.4rem;
    }

    .game-stats-bottom .stat-label {
        font-size: 0.45rem;
        margin-bottom: 0.4rem;
    }

    .game-stats-bottom canvas {
        width: 90px;
        height: 90px;
    }

    .vs-divider {
        font-size: 1.5rem;
    }

    /* Pause and game over screens */
    .pause-container h2,
    #gameover-title {
        font-size: 1.8rem;
    }

    .pause-container,
    .gameover-container {
        padding: 1rem;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .game-title {
        font-size: 1.2rem;
        margin-bottom: 1.5rem;
    }

    .menu-btn {
        padding: 0.7rem 1.2rem;
        font-size: 0.55rem;
    }

    .game-container {
        padding: 0.3rem 0;
        gap: 0.2rem;
    }

    .nes-layout {
        gap: 0.2rem;
    }

    .game-stats-top {
        padding: 0.4rem;
        border: 2px solid var(--nes-white);
    }

    .game-stats-bottom {
        padding: 0.3rem;
        border: 2px solid var(--nes-white);
    }

    .stats-row {
        gap: 0.3rem;
    }

    .stat-label {
        font-size: 0.48rem !important;
        margin-bottom: 0.2rem;
    }

    .stat-value {
        font-size: 0.85rem !important;
    }

    .score-diff {
        font-size: 0.4rem !important;
        margin-top: 0.1rem;
    }

    .game-stats-bottom .stat-label {
        font-size: 0.48rem !important;
        margin-bottom: 0.2rem;
    }

    .game-stats-bottom canvas {
        width: 70px !important;
        height: 70px !important;
    }

    .canvas-wrapper {
        border: 2px solid var(--nes-white);
    }

    .mobile-btn {
        width: 2rem;
        height: 2rem;
        font-size: 0.9rem;
        border: 2px solid var(--nes-white);
    }

    .lobby-container {
        min-width: auto;
        width: 90vw;
        padding: 1rem;
    }

    .lobby-container h2 {
        font-size: 1.2rem;
        margin-bottom: 1.5rem;
    }

    .settings-container {
        min-width: auto;
        width: 90vw;
        padding: 1rem;
    }

    .settings-container h2 {
        font-size: 1.5rem;
        margin-bottom: 2rem;
    }

    .setting-item {
        font-size: 0.5rem;
        padding: 0.6rem;
        gap: 0.5rem;
    }

    .pause-container h2,
    #gameover-title {
        font-size: 1.5rem;
    }

    .final-stat {
        font-size: 0.7rem;
        gap: 1rem;
    }

    #winner-text {
        font-size: 1.2rem;
    }
}