*{box-sizing:border-box}

:root{
    --bg-1: #0f1724;
    --bg-2: #0b1220;
    --card: rgba(255,255,255,0.04);
    --glass: rgba(255,255,255,0.06);
    --accent: #6EE7B7;
    --muted: rgba(255,255,255,0.35);
    --glass-strong: rgba(255,255,255,0.08);
    --shadow-1: 0 6px 20px rgba(2,6,23,0.6);
    --soft-shadow: 0 8px 24px rgba(2,6,23,0.55);
    --radius-lg: 16px;
    --radius-sm: 8px;
    --transition: 200ms cubic-bezier(.2,.9,.2,1);
}

html,body{
    height:100%;
    margin:0;
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
    background: radial-gradient(1200px 600px at 10% 10%, rgba(108,99,255,0.08), transparent 6%),
                linear-gradient(180deg, var(--bg-1), var(--bg-2));
    color: #E6EEF3;
    overflow:auto;
    padding:18px;
    overflow: hidden; /* disable page scrolling */
    padding: 0;
    overflow: hidden; /* disable page scrolling as requested */
    padding: 0;
}


/* Keep everything sized to viewport and allow children to flex/scale */
#gameContainer{
    max-width:1100px;
    margin:0 auto;
    display:flex;
    flex-direction:column;
    gap:18px;
    align-items:center;
    justify-content:flex-start;
    height: 100vh;            /* occupy viewport */
    padding: 18px;
    box-sizing: border-box;
    min-height: 0;            /* allow children to shrink */
    overflow: hidden;
}


/* First Screen Styles */
#firstScreen{
    width:100%;
    min-height:66vh;
    width:100%;
    height:100%;              /* fill container without adding document height */
    min-height:0;
    border-radius:var(--radius-lg);
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(0,0,0,0.02));
    box-shadow: var(--soft-shadow);
    padding:40px;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    backdrop-filter: blur(6px) saturate(110%);
    border: 1px solid var(--glass-strong);
}

#firstScreen h2{
    font-size: clamp(28px, 5vw, 44px);
    letter-spacing: -0.02em;
    margin:0 0 12px;
    color: #F8FAFC;
    text-shadow: 0 6px 18px rgba(14,22,40,0.55);
}

#firstScreen p{
    color: var(--muted);
    margin:0 0 18px;
    font-size: clamp(14px, 2.4vw, 16px);
    max-width:780px;
    text-align:center;
}
    

.game-button, #startButton{
    appearance:none;
    border: none;
    padding: 12px 22px;
    border-radius: 12px;
    background: linear-gradient(180deg, rgba(110,231,183,0.18), rgba(110,231,183,0.12));
    color: #DFFCF1;
    font-weight:700;
    letter-spacing:0.6px;
    cursor:pointer;
    box-shadow: 0 8px 18px rgba(46,64,88,0.5), inset 0 -2px 6px rgba(0,0,0,0.18);
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.game-button:hover{ transform: translateY(-4px); box-shadow: 0 18px 36px rgba(46,64,88,0.6); }
.game-button:active{ transform: translateY(-1px); opacity:0.95; }

/* GAME SCREEN LAYOUT */
#gameScreen{
    flex: 1 1 auto;
    align-items: center;
    justify-content: center;
    padding: 12px;
    overflow: hidden;
}

/* Game Status (glass card) */
#gameStatus{
    position:relative;
    width:220px;
    min-height:120px;
    border-radius:12px;
    padding:14px;
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
    border:1px solid rgba(255,255,255,0.04);
    box-shadow: var(--shadow-1);
    backdrop-filter: blur(8px) saturate(120%);
    display:flex;
    flex-direction:column;
    gap:8px;
    font-weight:600;
}

#gameStatus div{ color: #E6F8EF; font-size:14px; }
#gameStatus div span{ font-weight:800; color:var(--accent); }

/* Board + side column */
#gameBoard {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    justify-content: center;
    flex: 1 1 540px;
    min-width: 0;
}

/* frame that holds board + controls */
#gameBoardFrame {
    width: 100%;
    max-width: 980px;
    display: flex;
    gap: 18px;
    align-items: flex-start;
    justify-content: center;
    padding: 14px;
    border-radius: 14px;
    box-sizing: border-box;
    min-width: 0;
    flex-wrap: nowrap;
}

#controlsFrame {
    width: 140px;
    min-width: 120px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    align-items: center;
    justify-content: center;
}

#directionPad {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
}

#directionPad > button#upBtn,
#directionPad > button#downBtn {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.mid-row .mobile-btn {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.mid-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    width: 100%;
}

/* Canvas cards */
.canvas-card{
    border-radius:12px;
    padding:12px;
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.02));
    border:1px solid rgba(255,255,255,0.03);
    box-shadow: 0 12px 40px rgba(6,10,20,0.6);
    display:flex;
    align-items:center;
    justify-content:center;
}

.canvas-wrap {
    width: 100%;
    max-width: 520px;
    flex: 0 1 auto;
    display: block;
    min-width: 0;
}

/* Main game canvas */
/* Main game canvas — responsive and keeps 1:2 aspect (300x600) */
#gameCanvas {
    width: 100% !important;
    height: auto !important;
    aspect-ratio: 1 / 2;
    max-height: calc(100vh - 220px);
    display: block;
    border-radius: 10px;
    background: linear-gradient(180deg, #071026, #0b1b33);
    box-shadow: inset 0 6px 28px rgba(0,0,0,0.5);
    transform: translateZ(0);
    min-width: 0;
    image-rendering: optimizeQuality;
}

/* Next piece preview */
#nextPieceCanvas{
    width:140px;
    height:140px;
    display:block;
    border-radius:10px;
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.02));
}

/* Next piece label */
#nextPieceLabel{
    color:var(--muted);
    font-size:13px;
    margin-top:8px;
    text-align:center;
}

/* Mobile controls (floating) */
#mobileControls{
    display:flex;
    flex-direction:column;
    gap:10px;
    position:fixed;
    right:16px;
    bottom:16px;
    z-index:60;
}
.mobile-btn{
    width:56px;
    height:56px;
    border-radius:12px;
    border:1px solid rgba(255,255,255,0.05);
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
    color:#E6F8EF;
    font-weight:700;
    box-shadow: 0 10px 24px rgba(6,12,28,0.6);
    display:flex;
    align-items:center;
    justify-content:center;
    cursor:pointer;
    transition: all var(--transition);
}
.mobile-btn:hover{ transform: translateY(-6px); }

/* Next piece preview */
#nextPieceCanvas{
    width:140px;
    height:140px;
    display:block;
    border-radius:10px;
    background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.02));
}

/* Next piece label */
#nextPieceLabel{
    color:var(--muted);
    font-size:13px;
    margin-top:8px;
    text-align:center;
}

/* Mobile controls (floating) */
#mobileControls{
    display:flex;
    flex-direction:column;
    gap:10px;
    position:fixed;
    right:16px;
    bottom:16px;
    z-index:60;
}
.mobile-btn{
    width:56px;
    height:56px;
    border-radius:12px;
    border:1px solid rgba(255,255,255,0.05);
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
    color:#E6F8EF;
    font-weight:700;
    box-shadow: 0 10px 24px rgba(6,12,28,0.6);
    display:flex;
    align-items:center;
    justify-content:center;
    cursor:pointer;
    transition: all var(--transition);
}
.mobile-btn:hover{ transform: translateY(-6px); }

#virtualJoystick {
    width: 120px;
    height: 120px;
}

#virtualJoystick svg {
    width: 100%;
    height: 100%;
}

#virtualJoystick circle:hover {
    fill: rgba(255,255,255,0.8);
}

#actionButtons .mobile-btn {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    font-size: 18px;
}

#actionButtons {
    display: flex;
    gap: 10px;
    margin-top: 6px;
}

.action-btn {
    width: 60px;
    height: 60px;
    border-radius: 100%;
    border: 2px solid rgba(255,255,255,0.4);
    background-color: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    background-color: rgba(255,255,255,0.4);
    border-color: rgba(255,255,255,0.6);
}

.action-btn:active {
    transform: scale(0.95);
}

/* Game Over Popup */
#gameOverPopup {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.popup-content {
    background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 2px solid #444;
}
#controlsFrame .mobile-btn {
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.03));
    border: 1px solid rgba(255,255,255,0.04);
    box-shadow: 0 8px 20px rgba(6,10,20,0.45);
    transition: transform var(--transition), box-shadow var(--transition);
}

#controlsFrame .mobile-btn:active { transform: translateY(1px) scale(.98); }
#controlsFrame .mobile-btn:hover { transform: translateY(-4px); }

.popup-content h2{ font-size:24px; margin:0 0 8px; color:#FFF; }
.popup-content p{ color:var(--muted); margin:6px 0 14px; }

/* small UI niceties */
small.help{ color:var(--muted); font-size:12px }
#gameBoard, #gameBoardFrame, .canvas-card {
    min-width: 0;
}

/* Responsive Design */
/* Responsive adjustments */
@media (max-width: 820px) {
    #gameBoardFrame {
        flex-direction: column;
        align-items: center;
        padding: 12px;
        gap: 12px;
    }
    #gameBoard { flex-direction: column; gap: 12px; align-items:center; }
    #controlsFrame { width: 100%; flex-direction: row; gap: 12px; justify-content: center; }
    #directionPad { flex-direction: row; gap: 10px; align-items: center; }
    .mid-row { display: none; } /* hide L/R row when space is constrained */
    #directionPad > button#upBtn,
    #directionPad > button#downBtn,
    .mid-row .mobile-btn { width: 48px; height: 48px; font-size: 16px; }
    #actionButtons { order: 3; }
}

@media (max-width:480px){
    #gameContainer{ padding:12px; }
    #gameCanvas {
        width: 94vw;
        max-width: none;
        max-height: calc(100vh - 140px);
    }
    #firstScreen{ padding:20px; border-radius:12px; }
    .game-button{ padding:10px 16px; border-radius:10px; }
    #gameStatus{ width:100%; padding:10px; font-size:13px; }
    .mobile-btn{ width:48px; height:48px; border-radius:10px; }
}


/* Accessibility focus */
button:focus{ outline: 3px solid rgba(110,231,183,0.14); outline-offset:3px; border-radius:10px; }

@supports not (aspect-ratio: 1/2){
    .canvas-wrap{
        position:relative;
        padding-top: 200;
        height: 0;
    }
    .canvas-wrap > canvas {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
    }
}