@import url("https://fonts.googleapis.com/css?family=Nunito:400,700&display=swap");

:root {
    --small-screen: 600px;
    --medium-screen: 900px;
    --large-screen: 1200px;
    --gutter-bg-color: aliceblue;
    --primary-color: #c8f096;
    --secondary-color: #e66b5d;
    --background-color: #c6dede;
    --font-stack: "Nunito", sans-serif;
    --base-font-size: 1rem;
    --base-spacing: 0.5rem;
    --card-width: 20rem;
    --card-height: 24rem;
    --image-height: 18rem;
    --grid-gap: 1rem;
    --border-radius: 10px;
}

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

body {
    background-color: var(--gutter-bg-color);
    font-family: var(--font-stack);
    font-size: var(--base-font-size);
}

main {
    max-width: 900px;
    margin: auto;
    text-align: center;
    background-color: var(--background-color);
    min-height: 100vh;
}

nav, footer {
    max-width: 900px;
    margin: auto;
}

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--base-spacing) calc(2 * var(--base-spacing));
    background: var(--secondary-color);
    margin-bottom: 2em;
}

footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    text-align: center;
    background-color: #333;
    color: #fff;
    padding: 1rem;
    z-index: 100;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

ul {
    list-style: none;
    display: flex;
}

li {
    margin-right: var(--base-spacing);
}

h1 {
    color: var(--primary-color);
    margin-bottom: var(--base-spacing);
}

.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(var(--card-width), 1fr));
    grid-gap: var(--grid-gap);
    justify-content: center;
    align-items: center;
    margin: auto;
    padding: var(--base-spacing) 0;
}

.card {
    display: flex;
    align-items: center;
    flex-direction: column;
    width: var(--card-width);
    height: var(--card-height);
    background: #fff;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
    border-radius: var(--border-radius);
    margin: auto;
    overflow: hidden;
}

.card--image {
    width: 100%;
    height: var(--image-height);
    object-fit: cover;
}

.card--title {
    color: #222;
    font-weight: 700;
    text-transform: capitalize;
    font-size: 1.1rem;
    margin-top: var(--base-spacing);
}

.card--link {
    text-decoration: none;
    background: var(--secondary-color);
    color: #fff;
    padding: 0.3rem 1rem;
    border-radius: 20px;
}

@media only screen and (max-width: var(--small-screen)) {
    --card-width: 18rem;
    --grid-gap: 0.5rem;
    nav {
        flex-direction: column;
    }
    ul {
        flex-direction: column;
    }
}

@media only screen and (min-width: var(--medium-screen)) and (max-width: var(--large-screen)) {
    --card-width: 22rem;
    --grid-gap: 1.2rem;
}

@media only screen and (min-width: var(--large-screen)) {
    main {
        max-width: 80%;
        margin: auto;
        padding: 0 10%;
    }
    --card-width: 24rem;
    --grid-gap: 1.5rem;
}