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

/* CSS variables */
:root {
  --primary-color: #004080;
  --secondary-color: #f06;
  --dark-color: #333;
  --light-gray: #eee;
  --border-gray: #ccc;
  --black: #000;
  --heading-font: 'Montserrat', Helvetica, sans-serif;
  --body-font: Arial, sans-serif;
  --main-padding: 1rem;
  --link-padding: 0.5rem 1rem;
  --image-width: 200px;
}

/* Navigation */
nav {
  background-color: steelblue;
  padding: 1rem;
  display: flex;
  justify-content: space-evenly;
  align-items: center;
}

nav a {
  display: block;
  padding: 0.5rem;
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff; /* shorthand for white */
}

/* Headings */
h1 {
  color: var(--primary-color);
  font-family: var(--heading-font);
  border-bottom: 2px solid var(--dark-color); /* required by assignment */
}

/* Images - general */
img {
  width: var(--image-width);
  height: auto;
  border: 1px solid var(--border-gray);
  padding: 5px;
  box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
}

/* Profile image in main (floated right) */
main img {
  width: 150px;
  height: auto;
  float: right;
  margin: 0 0 1rem 1rem;
}

/* Header, Grid, Footer max width + center */
header, .grid, footer {
  max-width: 840px;
  margin: 0 auto;
}

/* Grid layout */
.grid {
  display: grid;
  grid-template-columns: 20rem 1fr; /* aside left, main right */
  align-items: stretch;
  gap: 1rem;
}

main {
  grid-column: 2/3;
  margin: 1rem;
}

aside {
  width: 20rem;
  margin: 1rem;
  border: 1px solid rgb(0 0 0 / 0.2);
  padding: 1rem;
  background-color: var(--light-gray);
  color: var(--dark-color);
  text-align: left;
  position: relative;
  grid-column: 1/2;
  grid-row: 1/2;
}

/* Overlay h2 inside aside */
aside h2 {
  position: absolute;
  top: 10px;
  left: 120px;
  background: rgba(255,255,255,0.4);
  padding: 0.2rem 0.5rem;
}

/* Aside image specific */
aside img {
  width: 100%;
  height: 70%;
}

/* Text */
p {
  padding: 0;
  font-family: var(--body-font);
  margin: 1rem;
}

/* Footer */
footer {
  margin-top: 15px;
  border-top: 1px solid var(--black);
  text-align: center;
  font-family: var(--body-font);
}

/* Class Selectors */
.box {
  margin: 1rem;
  border: 1px solid rgb(0 0 0 / 10%);
  padding: 1rem;
  background-color: #ddd;
  color: #000;
}