/* ======================
   GLOBAL
====================== */
body {
    background: radial-gradient(circle at center, #0a0a0a, #000);
    background-size: 300% 300%;
    animation: bgMove 15s infinite alternate;
    font-family: 'Poppins', sans-serif;
    color: white;
    text-align: center;
    padding-top: 20px;
}

/* Background animasi lembut */
@keyframes bgMove {
    0% { background-position: 0% 30%; }
    50% { background-position: 50% 70%; }
    100% { background-position: 100% 30%; }
}

h1 {
    font-size: 40px;
    font-weight: bold;
    text-shadow: 0 0 20px #00eaff, 0 0 40px #0099ff;
}

button {
    padding: 12px 22px;
    margin: 8px;
    background: #111;
    color: white;
    border: 2px solid #00eaff;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.25s;
    font-weight: bold;
}
button:hover {
    box-shadow: 0 0 15px #00eaff;
    transform: scale(1.05);
}

#score {
    color: #00eaff;
    text-shadow: 0 0 10px #00eaff;
    font-weight: bold;
    font-size: 20px;
}

/* ======================
   BOARD
====================== */


/* ==========================
   BOARD — MIRIP BORDER LOGIN
========================== */

#board {
    width: 460px;
    height: 460px;
    margin: 35px auto;
    padding: 20px;

    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 12px;

    background: rgba(30, 0, 50, 0.6); /* DALAM GELAP SAMA LOGIN */
    backdrop-filter: blur(10px);

    border: 2px solid rgba(0, 217, 255, 0.3); /* SAMA LOGIN */
    border-radius: 20px;

    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(0, 217, 255, 0.3),
        inset 0 0 30px rgba(0, 217, 255, 0.1);

    animation: glowBorderBoard 3s ease-in-out infinite;
}

/* Border berubah warna seperti login */
@keyframes glowBorderBoard {
    0%, 100% {
        border-color: rgba(0, 217, 255, 0.4);
        box-shadow: 
            0 20px 60px rgba(0, 0, 0, 0.5),
            0 0 40px rgba(0, 217, 255, 0.3),
            inset 0 0 30px rgba(0, 217, 255, 0.1);
    }
    50% {
        border-color: rgba(255, 0, 255, 0.5);
        box-shadow: 
            0 20px 60px rgba(0, 0, 0, 0.5),
            0 0 50px rgba(255, 0, 255, 0.4),
            inset 0 0 40px rgba(255, 0, 255, 0.15);
    }
}



/* ======================
   TILE
====================== */
.tile {
    width: 100%;
    height: 100%;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;

    font-size: 32px;
    font-weight: bold;

    color: white;
    background: rgba(255, 255, 255, 0.06);
    text-shadow: 0 0 10px white;

    transition: 0.1s;
}

/* animasi tile baru */
.tile.new {
    animation: pop 0.25s ease-out;
}
@keyframes pop {
    0% { transform: scale(0.2); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* Neon warna berdasarkan angka */
.tile-2 { background: #00eaff55; box-shadow: 0 0 10px #00eaff; }
.tile-4 { background: #00ff9955; box-shadow: 0 0 10px #00ff99; }
.tile-8 { background: #ff00ff55; box-shadow: 0 0 10px #ff00ff; }
.tile-16 { background: #ff006655; box-shadow: 0 0 10px #ff0066; }
.tile-32 { background: #ffaa0055; box-shadow: 0 0 10px #ffaa00; }
.tile-64 { background: #ff000055; box-shadow: 0 0 10px #ff0000; }
.tile-128 { background: #5f00ff55; box-shadow: 0 0 10px #5f00ff; }
.tile-256 { background: #00ffea55; box-shadow: 0 0 10px #00ffea; }
.tile-512 { background: #ff00aa55; box-shadow: 0 0 10px #ff00aa; }
.tile-1024 { background: #00ffaa55; box-shadow: 0 0 10px #00ffaa; }
.tile-2048 { background: #ffd70066; box-shadow: 0 0 15px #ffd700; }