:root {
    --blanc: #ffffff;
    --noir: #000000;
    --gris15: #e6e6e6;
    --gris25: #bfbfbf;
    --gris35: #808080;
    --gris45: #4d4d4d;
    --gris55: #262626;
    --vert15: #CFFF70;
    --vert25: #8FDE5D;
    --vert35: #3CA370;
    --vert45: #3D6E70;
    --vert55: #323E4F;
    --violet15: #66FFE3;
    --violet25: #4DA6FF;
    --violet35: #4B5BAB;
    --violet45: #473B78;
    --violet55: #322947;
    --fushia15: #FF00CC;
    --fushia25: #D70077;
    --fushia35: #780041;
    --fushia45: #4D002B;
    --fushia55: #200011;
}

body {
    background: var(--noir);
    color: var(--blanc);
    min-height: 100vh;
    font-family: 'Montserrat', sans-serif;
    margin: 0;
}

#sizeSelection, #modeSelection, #gameContainer {
    text-align: center;
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

#gameContainer {
    position: relative;
    padding: 10px 20px;
}

h2 {
    color: var(--fushia15);
    text-shadow: 0 0 10px var(--fushia35);
    margin-bottom: 30px;
    font-size: clamp(1.5rem, 4vw, 2rem);
}

#modeSelection {
    text-align: center;
    padding: 40px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.back-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}

.size-label {
    color: var(--fushia15);
    font-size: 1rem;
    text-shadow: 0 0 5px var(--fushia35);
}

.back-button {
    background: var(--fushia45);
}

.back-button:hover {
    background: var(--fushia35);
}

.size-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

button {
    padding: 15px 25px;
    font-size: 1rem;
    background: var(--fushia35);
    color: var(--blanc);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Montserrat', sans-serif;
}

button:hover {
    background: var(--fushia25);
    transform: translateY(-2px);
}

.mode-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
}

.board {
    display: grid;
    gap: 2px;
    padding: 10px;
    background: var(--fushia45);
    border-radius: 10px;
    box-shadow: 0 0 20px var(--fushia55);
    width: 100%;
    aspect-ratio: 1 / 1;
    margin: 0 auto;
    box-sizing: content-box;
    transition: opacity 0.3s ease;
}

.board.game-ended {
    opacity: 0.5;
}

@media (min-width: 1024px) {
    .board {
        width: 40%;
    }
}

.cell {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--noir);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s;
}

.cell:hover {
    background: var(--fushia55);
}

.piece {
    width: 70%;
    height: 70%;
    border-radius: 50%;
    position: absolute;
    transition: all 0.3s ease;
}

.piece.x {
    background: var(--vert25);
    box-shadow: 0 0 10px var(--vert35);
    animation: appear 0.3s ease-out;
}

.piece.o {
    background: var(--violet25);
    box-shadow: 0 0 10px var(--violet35);
    animation: appear 0.3s ease-out;
}

.winning-cell .piece {
    width: 85%;
    height: 85%;
    animation: highlight 1.2s ease-in-out infinite;
}

.winning-cell .piece.x {
    background: var(--vert15);
    box-shadow: 0 0 20px var(--vert25),
                0 0 40px var(--vert35),
                0 0 60px var(--vert45);
}

.winning-cell .piece.o {
    background: var(--violet15);
    box-shadow: 0 0 20px var(--violet25),
                0 0 40px var(--violet35),
                0 0 60px var(--violet45);
}

@keyframes highlight {
    0% {
        transform: scale(0.9);
        filter: brightness(1);
    }
    50% {
        transform: scale(1.1);
        filter: brightness(1.3);
    }
    100% {
        transform: scale(0.9);
        filter: brightness(1);
    }
}

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

.particle {
    position: absolute;
    width: 15px; /* Particules plus grandes */
    height: 15px;
    border-radius: 50%;
    pointer-events: none;
    animation: explode 2s cubic-bezier(0.17, 0.67, 0.83, 0.67) forwards; /* Animation plus longue et courbe plus dynamique */
}

.particle.x {
    background: var(--vert25);
    box-shadow: 0 0 20px var(--vert35),
                0 0 40px var(--vert25); /* Double glow effect */
}

.particle.o {
    background: var(--violet25);
    box-shadow: 0 0 20px var(--violet35),
                0 0 40px var(--violet25); /* Double glow effect */
}

@keyframes explode {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }
    20% {
        transform: translate(calc(var(--tx) * 0.3), calc(var(--ty) * 0.3)) scale(1.2);
        opacity: 0.9;
    }
    100% {
        transform: translate(var(--tx), var(--ty)) scale(0);
        opacity: 0;
    }
}

.captured {
    animation: implode 0.1s ease-out forwards;
}

@keyframes implode {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(0);
        opacity: 0;
    }
}

.status {
    display: none;
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    padding: 20px 20px;
    border-radius: 10px;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--fushia15);
    text-shadow: 0 0 10px var(--fushia35);
    z-index: 10;
    /*white-space: nowrap;*/
}

.status.show {
    display: block;
}

@media (min-width: 1024px) {
    .status {
        font-size: 1.5rem;
    }
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    padding: 20px 20px 20px 20px;
}

.score {
    font-size: clamp(1.2rem, 3vw, 2rem);
    margin-bottom: 20px;
}

.score .color-label {
    font-size: 0.7em;
}

.score .green {
    color: var(--vert25);
    text-shadow: 0 0 10px var(--vert35);
}

.score .violet {
    color: var(--violet25);
    text-shadow: 0 0 10px var(--violet35);
}

.score .points {
    color: var(--blanc);
    font-weight: bold;
    font-size: 1.2em;
    margin: 0 0.2em;
}

.score .separator {
    color: var(--fushia45);
    margin: 0 0.5em;
}

.back-button {
    background: var(--fushia45);
}

.back-button:hover {
    background: var(--fushia35);
}

@media (max-width: 480px) {
    .size-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
        padding: 10px;
    }
    
    .mode-buttons {
        flex-direction: column;
        align-items: center;
    }
}