:root {
    --radius: 40;
    --circle-radius: var(--radius);
    --circumference: calc(var(--radius) * 2 * 3.14);

    --board-dimensions: 350px;

    --line-width-horizontal: var(--board-dimensions);
    --line-height-horizontal: 10px;

    --delay: 125ms;

    --draw-animation: 1s;

    --x-color: #67cbff;
    --o-color: #ff6780;
    --background-color: #f4faff;
    --black: #282631;
}

body {
    background-color: var(--background-color);
    font-family: Arial, Helvetica, sans-serif;
    color: var(--black);
}

h1 {
    margin-top: 2rem;
    text-align: center;
    font-size: 3.2rem;
    font-weight: bolder;
}

h1 > .red {
    color: var(--o-color);
}

h1 > .blue {
    color: var(--x-color);
}

.line {
    overflow: hidden;
}

.line.horizontal {
    width: var(--line-width-horizontal);
    height: var(--line-height-horizontal);
    border-radius: 10px;
    position: relative;
}

.line.vertical {
    height: var(--line-width-horizontal);
    width: var(--line-height-horizontal);
    border-radius: 10px;
    position: absolute;
    top: 0;
}

#h-1 {
    top: calc((100% / 3) - calc(var(--line-height-horizontal) / 2));
}

#h-2 {
    top: calc((100% / 3) * 2 - calc(var(--line-height-horizontal)));
}

#v-1 {
    left: calc((100% / 3) - calc(var(--line-height-horizontal) / 2));
}

#v-2 {
    left: calc((100% / 3) * 2 - calc(var(--line-height-horizontal) / 2));
}

.grid {
    position: absolute;
    top: 0%;
    height: 100%;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: var(--line-height-horizontal);
}

.box {
    cursor: pointer;
    top: 0%;
    position: relative;
}

.box > div,
.box > svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.fill {
    background-color: var(--black);
}

.horizontal .fill {
    width: 100%;
    height: 100%;
    transform: translateX(-100%);
    border-radius: 10px;
}

.vertical .fill {
    height: 100%;
    width: 100%;
    transform: translateY(-100%);
    border-radius: 10px;
}

#h-1 > .fill {
    animation: appearHorizontal 1s linear forwards;
}

#h-2 > .fill {
    animation: appearHorizontal 1s linear forwards var(--delay);
}

#v-1 > .fill {
    animation: appearVertical 1s linear forwards calc(var(--delay) * 2);
}

#v-2 > .fill {
    animation: appearVertical 1s linear forwards calc(var(--delay) * 3);
}

.board {
    position: relative;
    height: var(--board-dimensions);
    width: var(--board-dimensions);
    box-shadow: 0px 0px 10px 5px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    padding: 20px;
}

.container {
    position: relative;
    height: 100%;
    width: 100%;
}

.absolute-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes appearHorizontal {
    to {
        transform: translateX(0%);
    }
}

@keyframes appearVertical {
    to {
        transform: translateY(0%);
    }
}

.x {
    height: 80%;
    width: 80%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.x-line {
    height: 10px;
    width: 100%;
    border-radius: 10px;
    overflow: hidden;
    position: absolute;
}

.shell > .x-line {
    transform: translateX(-150%);
    background-color: var(--x-color);
    transition: background-color var(--draw-animation);
}

.first-x-diagonal > .x-line {
    animation: draw calc(var(--draw-animation) / 2) linear forwards;
}

.second-x-diagonal > .x-line {
    animation: draw calc(var(--draw-animation) / 2) linear forwards calc(var(--draw-animation) / 2);
}
.first-x-diagonal {
    transform: rotate(45deg);
}

.second-x-diagonal {
    transform: rotate(-45deg);
}

@keyframes draw {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(0%);
    }
}

.box > .progress-ring {
    transform: translate(-50%, -50%) rotate(-90deg);
    height: calc(var(--board-dimensions) / 3);
    width: calc(var(--board-dimensions) / 3);
}
.progress-ring-circle {
    stroke-dasharray: var(--circumference) var(--circumference);
    stroke-linecap: round;
    stroke-dashoffset: var(--circumference);
    animation: spin var(--draw-animation) linear forwards;
    stroke: var(--o-color);
    transition: stroke var(--draw-animation);
}

#bottom-panel {
    position: absolute;
    bottom: 3%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

#announcement {
    text-align: center;
    width: 100%;
    font-size: 1.8rem;
    font-weight: bold;
}

#bottom-panel button {
    background-color: white;
    font-size: 1.3rem;
    border-radius: 5px;
    box-shadow: 0px 0px 10px 5px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--black);
    border-bottom: 3px solid black;
    font-weight: bold;
    padding: 5px 10px;
    margin-top: 10px;
}

@keyframes spin {
    from {
        stroke-dashoffset: 250px;
    }

    to {
        stroke-dashoffset: 0;
    }
}

@media (max-width: 486px) {
    :root {
        --board-dimensions: 275px;
        --circle-radius: 25px;
    }

    #bottom-panel {
        bottom: 8%;
    }
}