@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700;800&display=swap');

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Poppins',sans-serif;
}

body{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    overflow:hidden;
    background:
        radial-gradient(circle at top left,#7c3aed33,transparent 30%),
        radial-gradient(circle at bottom right,#06b6d433,transparent 30%),
        linear-gradient(135deg,#020617,#0f172a,#111827);
    color:white;
    position:relative;
}

/* Animated glowing background */
body::before,
body::after{
    content:'';
    position:absolute;
    width:380px;
    height:380px;
    border-radius:50%;
    filter:blur(90px);
    opacity:.35;
    animation:floatBlob 8s ease-in-out infinite alternate;
}

body::before{
    background:#7c3aed;
    top:-120px;
    left:-120px;
}

body::after{
    background:#06b6d4;
    bottom:-140px;
    right:-120px;
    animation-delay:2s;
}

@keyframes floatBlob{
    from{ transform:translateY(0) translateX(0); }
    to{ transform:translateY(40px) translateX(30px); }
}

main{
    width:100%;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    position:relative;
    z-index:1;
    padding:20px;
}

/* Heading */

h1{
    margin-bottom:25px;
    font-size:4.5rem;
    font-weight:800;
    text-transform:uppercase;
    letter-spacing:4px;
    background:linear-gradient(90deg,#ffffff,#67e8f9,#a78bfa,#ffffff);
    background-size:300% 300%;
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    text-shadow:
        0 0 10px rgba(255,255,255,0.2),
        0 0 20px rgba(103,232,249,0.25),
        0 0 40px rgba(167,139,250,0.25);
    animation:glowText 4s ease infinite;
}

@keyframes glowText{
    0%{
        background-position:0% 50%;
        transform:scale(1);
    }
    50%{
        background-position:100% 50%;
        transform:scale(1.03);
    }
    100%{
        background-position:0% 50%;
        transform:scale(1);
    }
}

/* Game board */

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

.game{
    width:min(88vmin,560px);
    aspect-ratio:1;
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:18px;
    padding:24px;
    border-radius:34px;
    background:rgba(255,255,255,0.08);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    border:1px solid rgba(255,255,255,0.14);
    box-shadow:
        0 30px 80px rgba(0,0,0,0.55),
        inset 0 1px 0 rgba(255,255,255,0.08),
        0 0 40px rgba(124,58,237,0.18);
    position:relative;
}

.game::before{
    content:'';
    position:absolute;
    inset:-2px;
    border-radius:36px;
    background:linear-gradient(135deg,rgba(255,255,255,.15),rgba(255,255,255,0),rgba(103,232,249,.15));
    z-index:-1;
}

/* Boxes */

.box{
    border:none;
    border-radius:28px;
    background:linear-gradient(145deg,#f8fafc,#dbe7f5);
    color:#0f172a;
    font-size:4rem;
    font-weight:800;
    cursor:pointer;
    position:relative;
    overflow:hidden;
    transition:all .2s ease;
    box-shadow:
        inset 0 2px 6px rgba(255,255,255,.95),
        0 10px 18px rgba(0,0,0,.18);
}

.box::before{
    content:'';
    position:absolute;
    top:0;
    left:-120%;
    width:70%;
    height:100%;
    background:linear-gradient(120deg,transparent,rgba(255,255,255,.7),transparent);
    transform:skewX(-20deg);
    transition:left .5s ease;
}

.box:hover::before{
    left:150%;
}

.box:hover{
    transform:translateY(-8px) scale(1.04);
    box-shadow:
        inset 0 2px 6px rgba(255,255,255,.95),
        0 20px 30px rgba(0,0,0,.28),
        0 0 24px rgba(255,255,255,.12);
}

.box:active{
    transform:scale(.96);
}

/* Winner highlight */

.box.win{
    background:linear-gradient(135deg,#22c55e,#16a34a);
    color:white;
    box-shadow:
        0 0 22px rgba(34,197,94,.7),
        0 0 44px rgba(34,197,94,.45),
        0 14px 30px rgba(0,0,0,.28);
}

/* Buttons */

#reset-btn,
#new-btn{
    margin-top:28px;
    padding:14px 34px;
    border:none;
    border-radius:999px;
    background:linear-gradient(135deg,#7c3aed,#2563eb,#06b6d4);
    background-size:200% 200%;
    color:white;
    font-size:1rem;
    font-weight:700;
    letter-spacing:.5px;
    cursor:pointer;
    box-shadow:
        0 14px 28px rgba(37,99,235,.35),
        0 0 24px rgba(124,58,237,.25);
    transition:all .2s ease;
    animation:gradientMove 4s ease infinite;
}

@keyframes gradientMove{
    0%{background-position:0% 50%;}
    50%{background-position:100% 50%;}
    100%{background-position:0% 50%;}
}

#reset-btn:hover,
#new-btn:hover{
    transform:translateY(-4px) scale(1.03);
    box-shadow:
        0 22px 40px rgba(37,99,235,.45),
        0 0 32px rgba(124,58,237,.4);
}

/* Winner popup */

.msg-container{
    position:fixed;
    inset:0;
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    gap:18px;
    background:rgba(2,6,23,.75);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    z-index:10;
    animation:fadeIn .35s ease;
}

#msg{
    font-size:2.2rem;
    font-weight:700;
    text-align:center;
    color:#fff;
    text-shadow:0 0 18px rgba(255,255,255,.35);
}

.hide{
    display:none;
}

@keyframes fadeIn{
    from{ opacity:0; }
    to{ opacity:1; }
}

/* Responsive */

@media (max-width:600px){

    h1{
        font-size:2.8rem;
        margin-bottom:18px;
    }

    .game{
        width:94vmin;
        gap:14px;
        padding:18px;
        border-radius:26px;
    }

    .box{
        font-size:3rem;
        border-radius:22px;
    }

    #reset-btn,
    #new-btn{
        width:80%;
        max-width:260px;
    }

    #msg{
        font-size:1.7rem;
        padding:0 20px;
    }
}