:root {
    --void-black: #020204;
    --deep-blue: #001a33;
    --nebula-purple: #1a012a;
    --stellar-gold: #d4af37;
    --neon-purple: #8a2be2;
    --glass: rgba(255, 255, 255, 0.03);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--void-black);
    color: white;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
}

/* Moving Dynamic Gradient Background */
.bg-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 20% 30%, var(--deep-blue) 0%, var(--void-black) 40%, var(--nebula-purple) 70%, var(--void-black) 100%);
    background-size: 200% 200%;
    animation: drift 15s ease infinite;
}

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

.main-wrapper {
    width: 100%;
    height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-around;
}

h1 {
    font-size: clamp(2rem, 8vw, 4rem);
    color: var(--stellar-gold);
    text-transform: uppercase;
    letter-spacing: 10px;
    text-shadow: 0 0 20px rgba(212, 175, 55, 0.4);
}

#status {
    font-size: 1.2rem;
    letter-spacing: 3px;
    margin-top: 10px;
    color: #aaa;
}

/* Broad Board Layout */
.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 15px;
    width: 85vmin;
    height: 85vmin;
    max-width: 550px;
    max-height: 550px;
    background: var(--glass);
    padding: 20px;
    border-radius: 25px;
    border: 1px solid rgba(212, 175, 55, 0.1);
    backdrop-filter: blur(10px);
}

.cell {
    background: rgba(0, 0, 0, 0.6);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.cell:hover:not(.occupied) {
    background: rgba(138, 43, 226, 0.1);
    border-color: var(--neon-purple);
    transform: scale(1.02);
}

.cell img {
    width: 65%;
    height: 65%;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.cell.occupied img {
    opacity: 1;
    transform: scale(1);
}

/* Win Effect */
.cell.winner {
    background: linear-gradient(135deg, var(--stellar-gold), var(--neon-purple));
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.6);
}

.cell.winner img {
    filter: brightness(0) contrast(100%); /* Makes icon black on the gold win background */
}

#reset-btn {
    padding: 12px 35px;
    background: transparent;
    border: 2px solid var(--stellar-gold);
    color: var(--stellar-gold);
    font-weight: bold;
    cursor: pointer;
    border-radius: 50px;
    transition: 0.3s;
    letter-spacing: 2px;
}

#reset-btn:hover {
    background: var(--stellar-gold);
    color: black;
    box-shadow: 0 0 20px var(--stellar-gold);
}