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

/* BASE STYLE */
body {
    font-family: Arial, sans-serif;
    background: #f2f2f2;
    color: #333;
    line-height: 1.6;
}

/* HEADER */
.header {
    background: #1f1f1f;
    color: white;
    text-align: center;
    padding: 20px;
}

/* FLEXBOX NAV */
.nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.nav a {
    color: white;
    text-decoration: none;
    background: #444;
    padding: 8px;
    border-radius: 5px;
}

/* GRID LAYOUT */
.grid-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    padding: 15px;
}

/* INTRO BOX */
.intro {
    background: white;
    padding: 15px;
    border-radius: 8px;
}

/* CARD STYLE */
.card {
    background: white;
    padding: 15px;
    border-radius: 8px;
}

/* IMAGE BOXES (NO EXTERNAL IMAGES) */
.img-box {
    width: 100%;
    height: 160px;
    border-radius: 6px;
    margin-bottom: 10px;
}

/* Different colors to represent images */
.grid-img {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
}

.flex-img {
    background: linear-gradient(135deg, #43e97b, #38f9d7);
}

.media-img {
    background: linear-gradient(135deg, #fa709a, #fee140);
}

/* FOOTER */
.footer {
    text-align: center;
    background: #1f1f1f;
    color: white;
    padding: 15px;
    margin-top: 20px;
}

/* TABLET */
@media (min-width: 600px) {

    .nav {
        flex-direction: row;
        justify-content: center;
    }

    .grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* DESKTOP */
@media (min-width: 900px) {

    .grid-container {
        grid-template-columns: repeat(3, 1fr);
    }

    .intro {
        grid-column: span 3;
    }
}