:root {
    /* Paleta kolorów - Wersja Soft/Pastel Neon */
    --neon-blue: #38bdf8;   /* Sky Blue */
    --neon-pink: #e879f9;   /* Fuchsia */
    --neon-green: #4ade80;  /* Soft Green */
    --neon-yellow: #facc15; /* Warm Yellow */
    --neon-red: #f87171;    /* Soft Red */
    --neon-orange: #fb923c; /* Soft Orange */
    --neon-violet: #a78bfa; /* Soft Violet */
    
    /* Tła i tekst */
    --bg-main: #0f172a;     
    --bg-panel: rgba(30, 41, 59, 0.98); 
    --text-main: #e2e8f0;   
    --text-muted: #94a3b8;  
    
    --tile-bg: #1e293b;     
    --tile-border: rgba(255, 255, 255, 0.08);
    --board-bg: #020617;
    --board-shadow: rgba(0, 0, 0, 0.5);
    
    --btn-bg: rgba(255, 255, 255, 0.03);
    --btn-hover: rgba(255, 255, 255, 0.08);
    --btn-border: rgba(255, 255, 255, 0.1);
    
    /* Grid Color for Animation */
    --grid-color: rgba(56, 189, 248, 0.08);
    
    --score-color: #ffffff;
}

html { 
    height: 100%; 
    width: 100%;
    margin: 0;
    padding: 0;
}

/* Hide scrollbar globally */
* {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

*::-webkit-scrollbar {
    display: none;
    width: 0;
    height: 0;
}

body {
    font-family: 'Orbitron', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    touch-action: auto; 
    position: fixed;
    top: 0;
    left: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* GamePix iframe optimization */
.content-wrapper {
    width: 100%;
    max-width: 28rem;
    overflow: visible;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 0.5rem 1rem;
    box-sizing: border-box;
}

/* GamePix 800x450 - PRIMARY TARGET */
@media (min-width: 700px) and (max-width: 900px) and (max-height: 500px) {
    body {
        align-items: flex-start;
        padding-top: 0;
        overflow: hidden;
    }
    
    .content-wrapper {
        max-width: 100%;
        height: auto;
        padding: 0.3rem 0.5rem;
        justify-content: flex-start;
        overflow: visible;
        transform: scale(0.95);
        transform-origin: top center;
    }
    
    .board-container {
        max-width: 260px !important;
        max-height: 260px !important;
        width: 260px !important;
        height: 260px !important;
    }
    
    h1 {
        font-size: 1.25rem !important;
        margin-bottom: 0 !important;
        line-height: 1.2 !important;
    }
    
    p.text-gray-400, p.text-cyan-200 {
        font-size: 0.45rem !important;
        margin-top: 0.05rem !important;
        margin-bottom: 0 !important;
    }
    
    .stat-box {
        padding: 2px 4px !important;
        min-width: 45px !important;
    }
    
    .stat-label {
        font-size: 0.45rem !important;
        line-height: 1 !important;
    }
    
    #score, #best-score, #timer-display {
        font-size: 0.65rem !important;
        line-height: 1 !important;
    }
    
    .action-btn {
        width: 28px !important;
        height: 28px !important;
        min-width: 28px !important;
        min-height: 28px !important;
    }
    
    .action-btn svg {
        width: 14px !important;
        height: 14px !important;
    }
    
    .main-btn {
        padding: 4px 6px !important;
        font-size: 0.55rem !important;
        line-height: 1 !important;
    }
    
    .main-btn svg {
        width: 11px !important;
        height: 11px !important;
    }
    
    /* Ultra compact margins for 450px height */
    .mb-1 { margin-bottom: 0.1rem !important; }
    .mb-2 { margin-bottom: 0.15rem !important; }
    .mb-3 { margin-bottom: 0.2rem !important; }
    .gap-1 { gap: 0.1rem !important; }
    .gap-2 { gap: 0.15rem !important; }
    .px-4 { padding-left: 0.5rem !important; padding-right: 0.5rem !important; }
    
    /* Smaller text everywhere */
    .text-xs { font-size: 0.5rem !important; }
    span, p { font-size: 0.55rem !important; }
    
    /* Combo bar */
    #combo-bar-bg { height: 0.25rem !important; }
}

/* --- ANIMATED BACKGROUND --- */
body::before {
    content: "";
    position: fixed;
    top: -50%; left: -50%; 
    width: 200%; height: 200%;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: cyber-pan 20s linear infinite;
    z-index: -1;
    pointer-events: none;
    transform: perspective(500px) rotateX(20deg);
}

@keyframes cyber-pan {
    0% { transform: translateY(0) translateX(0) perspective(500px) rotateX(20deg); }
    100% { transform: translateY(-50px) translateX(-50px) perspective(500px) rotateX(20deg); }
}

body::after {
    content: "";
    display: block;
    position: fixed;
    top: 0; left: 0; bottom: 0; right: 0;
    background: radial-gradient(circle, transparent 30%, #020617 90%);
    z-index: -1; 
    pointer-events: none;
}

.content-wrapper { position: relative; z-index: 10; }

/* --- BOARD CONTAINER --- */
.board-container {
    position: relative;
    background-color: var(--board-bg);
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    height: 100%;
    max-height: 400px;
    aspect-ratio: 1 / 1;
    margin: 0 auto;
    touch-action: none; 
    box-shadow: inset 0 0 20px rgba(0,0,0,0.2);
    border: 4px solid var(--board-bg);
    cursor: default;
    overflow: hidden;
    transition: background-color 0.3s;
    z-index: 10; 
}

.eraser-mode .board-container { cursor: crosshair; }
.eraser-mode .tile-inner { cursor: pointer; animation: pulse-red 0.8s infinite; }

@keyframes pulse-red {
    0%, 100% { border-color: var(--neon-red); box-shadow: inset 0 0 0 2px var(--neon-red); }
    50% { border-color: transparent; box-shadow: none; }
}

.grid-cell { position: absolute; box-sizing: border-box; padding: 4px; }
@media (min-width: 500px) { .grid-cell { padding: 8px; } }

.grid-cell-inner {
    width: 100%; height: 100%;
    background: rgba(100, 116, 139, 0.1); 
    border-radius: 4px;
}

/* MOVING TILE WRAPPER */
.tile-element {
    position: absolute;
    box-sizing: border-box;
    padding: 4px;
    z-index: 10;
    transition: left 100ms ease-in-out, top 100ms ease-in-out; 
}
@media (min-width: 500px) { .tile-element { padding: 8px; } }

.tile-inner {
    width: 100%; height: 100%;
    border-radius: 4px;
    display: flex; justify-content: center; align-items: center;
    font-weight: 600; 
    font-size: 1.5rem; 
    color: var(--text-main);
    background-color: var(--tile-bg);
    transition: transform 0.1s ease-in-out, background-color 0.3s;
    border: 2px solid transparent; 
    z-index: 10;
}

@media (min-width: 400px) { .tile-inner { font-size: 2rem; } }

/* DYNAMIC FONT SIZES */
.tile-inner.digits-3 { font-size: 1.4rem; }
.tile-inner.digits-4 { font-size: 1.1rem; }
.tile-inner.digits-5 { font-size: 0.9rem; }

@media (min-width: 400px) {
    .tile-inner.digits-3 { font-size: 1.9rem; }
    .tile-inner.digits-4 { font-size: 1.5rem; }
    .tile-inner.digits-5 { font-size: 1.2rem; }
}

.particle {
    position: absolute; width: 4px; height: 4px; border-radius: 50%; pointer-events: none;
    animation: particle-explode 0.6s ease-out forwards; z-index: 20;
}
@keyframes particle-explode {
    0% { transform: translate(0, 0) scale(1); opacity: 0.8; }
    100% { transform: translate(var(--tx), var(--ty)) scale(0); opacity: 0; }
}

.combo-container {
    width: 100%; height: 4px; background: rgba(255,255,255,0.1);
    border-radius: 2px; margin-top: 8px; overflow: hidden; position: relative;
}
.combo-fill {
    height: 100%; width: 0%;
    background: var(--neon-yellow);
    transition: width 0.1s linear;
}
.combo-text {
    position: absolute; top: -20px; right: 0; font-size: 0.65rem; letter-spacing: 1px;
    font-weight: bold; color: var(--neon-yellow); transition: opacity 0.2s;
}
.combo-active .combo-text { opacity: 1; }

/* --- TILE COLORS --- */
.tile-inner.tile-2 { border-color: var(--neon-blue); color: var(--neon-blue); background: var(--tile-bg); }
.tile-inner.tile-4 { border-color: var(--neon-pink); color: var(--neon-pink); background: var(--tile-bg); }
.tile-inner.tile-8 { border-color: var(--neon-green); color: var(--neon-green); background: var(--tile-bg); }
.tile-inner.tile-16 { border-color: var(--neon-yellow); color: var(--neon-yellow); background: var(--tile-bg); }
.tile-inner.tile-32 { border-color: var(--neon-orange); color: var(--neon-orange); background: var(--tile-bg); }
.tile-inner.tile-64 { border-color: var(--neon-red); color: var(--neon-red); background: var(--tile-bg); }
.tile-inner.tile-128 { border-color: var(--neon-violet); color: var(--neon-violet); background: var(--tile-bg); }

.tile-inner.tile-256 { background-color: var(--neon-blue); border-color: var(--neon-blue); color: #0f172a; }
.tile-inner.tile-512 { background-color: var(--neon-pink); border-color: var(--neon-pink); color: #fff; }
.tile-inner.tile-1024 { background-color: var(--neon-green); border-color: var(--neon-green); color: #0f172a; }

.tile-inner.tile-2048 { 
    background-color: var(--neon-yellow); border-color: var(--neon-yellow); color: #0f172a; 
    animation: pulse-soft 3s infinite;
}
@keyframes pulse-soft { 0%, 100% { opacity: 1; } 50% { opacity: 0.8; } }

.tile-new .tile-inner { animation: appear 0.2s ease-out; }
.tile-merged .tile-inner { animation: pop 0.15s ease-out; }

@keyframes appear { from { transform: scale(0); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes pop { 50% { transform: scale(1.15); } }

.floating-equation {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-main); font-weight: 600; font-size: 0.9rem;
    pointer-events: none; z-index: 50;
    animation: floatUp 0.8s ease-out forwards;
}
@keyframes floatUp {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
    100% { opacity: 0; transform: translate(-50%, -150%) scale(1); }
}

/* Buttons */
.action-btn {
    background: var(--btn-bg); border: 1px solid var(--btn-border);
    color: var(--text-muted); transition: all 0.2s; position: relative;
    display: flex; align-items: center; justify-content: center;
    width: 40px; height: 40px;
    min-width: 36px; min-height: 36px;
    cursor: pointer; 
    z-index: 20; 
    border-radius: 6px;
}
.action-btn:hover {
    background: var(--btn-hover); border-color: var(--text-main); color: var(--text-main);
    z-index: 25;
}
.action-btn:active { transform: scale(0.95); }
.action-btn.active {
    background-color: rgba(248, 113, 113, 0.1); border-color: var(--neon-red); color: var(--neon-red);
}

.tooltip-text {
    visibility: hidden; width: max-content;
    background-color: var(--bg-panel); color: var(--text-main);
    text-align: center; border: 1px solid var(--btn-border);
    border-radius: 4px; padding: 4px 8px; position: absolute;
    z-index: 100; bottom: 130%; left: 50%; transform: translateX(-50%);
    opacity: 0; transition: opacity 0.3s; font-size: 0.6rem; pointer-events: none;
    text-transform: uppercase; letter-spacing: 1px;
}
@media (hover: hover) { .action-btn:hover .tooltip-text { visibility: visible; opacity: 1; } }

.power-badge {
    position: absolute; top: -5px; right: -5px;
    background: var(--neon-red); color: white; border-radius: 50%;
    width: 16px; height: 16px; font-size: 10px;
    display: flex; align-items: center; justify-content: center;
    z-index: 10;
}

/* Overlays */
.overlay {
    display: none; background: var(--bg-panel); backdrop-filter: blur(15px);
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 100; flex-direction: column; justify-content: center; align-items: center;
    border-radius: 12px; overflow-y: auto; padding: 10px 0;
}
.overlay.active { display: flex; }

.menu-btn {
    width: 80%; max-width: 250px;
    margin: 4px; padding: 10px;
    font-size: 0.85rem; font-weight: bold; color: var(--neon-blue);
    background: transparent; border: 1px solid var(--tile-border); border-radius: 6px;
    transition: all 0.2s; text-transform: uppercase; letter-spacing: 2px;
    position: relative; overflow: hidden;
    flex-shrink: 0;
    cursor: pointer;
}
.menu-btn:hover { background: rgba(56, 189, 248, 0.05); border-color: var(--neon-blue); }

.main-btn {
    background: var(--tile-border); color: var(--text-main); border: 1px solid var(--neon-blue);
    text-transform: uppercase; letter-spacing: 1px; 
    padding: 8px 12px;
    font-size: 0.7rem;
    display: flex; align-items: center; justify-content: center; gap: 6px; 
    cursor: pointer;
    z-index: 20;
    border-radius: 6px;
}
@media (min-width: 350px) { .main-btn { padding: 10px 16px; font-size: 0.8rem; } }
.main-btn:hover { background: var(--btn-hover); filter: brightness(1.1); transform: translateY(-1px); }

.stat-box {
    background: var(--btn-bg); border: 1px solid var(--btn-border);
    border-radius: 6px; min-w-[60px]; padding: 4px;
}
@media (min-width: 400px) { .stat-box { min-width: 80px; padding: 8px; } }
.stat-label { color: var(--text-muted); font-size: 0.55rem; letter-spacing: 1px; margin-bottom: 2px; }

#score, #best-score { color: var(--score-color); }

#notification-toast {
    position: fixed; bottom: -100px; left: 50%; transform: translateX(-50%);
    background: var(--bg-panel); border: 1px solid var(--tile-border);
    color: var(--neon-yellow); padding: 8px 16px; border-radius: 50px;
    display: flex; align-items: center; gap: 10px; width: max-content;
    transition: bottom 0.5s; z-index: 200;
}
#notification-toast.show { bottom: 30px; }

.achievement-card, .stat-row, .lb-row {
    background: var(--btn-bg); border: 1px solid var(--tile-border);
    border-radius: 8px; padding: 10px; margin-bottom: 8px; width: 100%; max-width: 280px;
    display: flex; align-items: center; gap: 10px; transition: all 0.3s;
    flex-shrink: 0;
}

.lb-row { justify-content: space-between; font-size: 0.8rem; padding: 8px 12px; }
.rank-1 { border-color: var(--neon-yellow); background: rgba(250, 204, 21, 0.05); }
.rank-2 { border-color: var(--text-muted); }
.rank-3 { border-color: var(--neon-orange); }
.active-lb { background-color: var(--neon-blue); color: #0f172a; border-color: var(--neon-blue); font-weight: bold; }

.stat-row { justify-content: space-between; padding: 12px; }
.achievement-card.unlocked {
    border-color: var(--neon-green); background: rgba(74, 222, 128, 0.05);
}
.achievement-icon { font-size: 20px; filter: grayscale(1); opacity: 0.5; }
.achievement-card.unlocked .achievement-icon { filter: grayscale(0); opacity: 1; }
.achievement-info h4 { font-size: 0.75rem; color: var(--text-muted); margin: 0; }
.achievement-card.unlocked h4 { color: var(--text-main); }
.achievement-info p { font-size: 0.55rem; color: var(--text-muted); margin: 0; }

.stat-label-text { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; }
.stat-value-text { font-size: 0.9rem; font-weight: bold; color: var(--neon-blue); }

svg { width: 20px; height: 20px; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; stroke: currentColor; }
.neon-blue { color: var(--neon-blue); }
.neon-pink { color: var(--neon-pink); }
.neon-green { color: var(--neon-green); }
.neon-yellow { color: var(--neon-yellow); }
.neon-red { color: var(--neon-red); }

.help-section { width: 100%; max-width: 280px; flex-shrink: 0; }

.opacity-0 { opacity: 0; }
.opacity-100 { opacity: 1; }
#combo-text-container, #combo-bar-bg { transition: opacity 0.3s; }

.active-mode {
    background-color: var(--btn-hover);
    box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
}
#mode-btn-classic.active-mode { color: var(--neon-blue); border-color: var(--neon-blue); }
#mode-btn-rush.active-mode { color: var(--neon-red); border-color: var(--neon-red); }

/* Login & Leaderboard Styles */
input[type="text"], input[type="password"] {
    font-family: 'Orbitron', sans-serif;
}

input[type="text"]:focus, input[type="password"]:focus {
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}

.active-lb {
    background-color: rgba(56, 189, 248, 0.1) !important;
    color: var(--neon-blue) !important;
    border-color: var(--neon-blue) !important;
    font-weight: bold;
}

.neon-gray {
    color: var(--text-muted);
}

/* Mobile optimizations */
@media (max-width: 380px) {

/* Mobile optimizations */
@media (max-width: 380px) {
    .action-btn {
        width: 36px;
        height: 36px;
        min-width: 32px;
        min-height: 32px;
    }
    
    .main-btn {
        padding: 8px 10px;
        font-size: 0.65rem;
    }
    
    .main-btn svg {
        width: 14px;
        height: 14px;
    }
    
    h1 {
        font-size: 2rem !important;
    }
    
    .stat-box {
        min-width: 55px;
        padding: 4px 6px;
    }
}