:root {
    --primery-color_Soft-Blue: hsl(215, 51%, 70%);
    --primery-color_Cyan: hsl(178, 100%, 50%);
    --primery-color_Cyan_See_Through: hsla(178, 100%, 50%, 0.5);
    --neutral-color_Very_Dark_Blue_Main_BG: hsl(217, 54%, 11%);
    --neutral-color_Very_Dark_Blue_Card_BG: hsl(216, 50%, 16%);
    --neutral-color_Very_Dark_Blue_Line: hsl(215, 32%, 27%);
    --on-hover-transition-time: 300ms;
}

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

body {
    background-color: var(--neutral-color_Very_Dark_Blue_Main_BG);
    font-family: 'Outfit', sans-serif;
    font-size: 18px;
    color: white;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* main content of card */
.card-wrapper {
    background-color: var(--neutral-color_Very_Dark_Blue_Card_BG);
    width: 350px;
    height: max-content;
    display: flex;
    flex-flow: column nowrap;
    border-radius: 15px;
    box-shadow: 15px 15px 15px hsla(215, 100%, 7%, 0.5), -1px -1px 10px hsla(215, 100%, 7%, 0.5);
    margin-bottom: 50px;
    min-width: 300px;
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 20px;
}

.hero-img {
    position: relative;
    cursor: pointer;
    height: 310px;
}

.hero-img:hover>img+.on-hover {
    display: block;
    animation: view 500ms ease-in forwards;

}

@keyframes view {
    0%{
        background-color: hsla(178, 100%, 50%, 0.1);
    }
}

.hero-img img {
    width: 100%;
    border-radius: 10px;
}

.on-hover {
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    border-radius: 10px;
    background-color: var(--primery-color_Cyan_See_Through);
}

.on-hover div {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.item-name:hover {
    cursor: pointer;
    color: var(--primery-color_Cyan);
    transition-duration: var(--on-hover-transition-time);
}

.item-description {
    color: var(--primery-color_Soft-Blue);
}

.balance-and-time {
    display: flex;
    justify-content: space-between;
    margin: 10px 0;
}

.balance {
    color: var(--primery-color_Cyan);
}

.time-left {
    color: var(--primery-color_Soft-Blue);
}

/* footer */
footer {
    margin: 0 20px 30px 20px;
    padding-top: 15px;
    display: flex;
    gap: 10px;
    align-items: center;
    border-top: 1.5px solid hsla(215, 52%, 70%, 0.2);
}

.author-avatar {
    border: 1px solid white;
    border-radius: 50%;
    width: 35px;
}

.author {
    color: var(--primery-color_Soft-Blue);
}

.author-name:hover {
    cursor: pointer;
    color: var(--primery-color_Cyan);
    transition-duration: var(--on-hover-transition-time);
}

/* attribution */
.attribution {
    position: absolute;
    bottom: 20px;
    font-size: 14px;
}

.attribution a {
    color: var(--primery-color_Soft-Blue);
}