:root {
  --bg-color-body: #f7f9fb;
  --bg-color-content: #fff;
  --text-color: #333;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color-body: #252733;
    --bg-color-content: #292938;
    --text-color: #8b91a0;
  }
}

body {
  background-color: var(--bg-color-body);
  color: var(--text-color);
  font-family: "Montserrat", "Segoe UI", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  margin: 0;
}

nav {
  background-color: var(--bg-color-content);
  padding: 20px 0;
}

.nav-content {
  margin: 0 auto;
  max-width: 1000px;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  float: right;
}

nav li {
  float: left;
}

nav::after {
  content: "";
  display: block;
  clear: both;
}

nav li a {
  display: block;
  color: var(--text-color);
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

nav li a:hover {
  background-color: #ddd;
}

.header {
  padding: 20px;
  text-align: center;
}

.content {
  background-color: var(--bg-color-content);
  padding: 20px;
  margin: 0 auto;
  max-width: 1000px;
}

button {
  background-color: #3366ff;
  color: #fff;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
}

@media (prefers-color-scheme: dark) {
  button {
    background-color: #364fc7;
    color: #abb2bf;
  }
}

h1 {
  color: var(--text-color);
  font-size: 40px;
}

h2 {
  color: var(--text-color);
  font-size: 20px;
}

.grid {
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 800px) {
  .grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    place-items: center;
  }
}

@media (prefers-color-scheme: dark) {
  .image1,
  .image2,
  .image3 {
    filter: invert(80%) sepia(15%) saturate(200%) hue-rotate(185deg)
      brightness(90%);
  }
}

.footer {
  padding: 20px;
  text-align: center;
}

a {
  color: var(--text-color);
  text-decoration: none;
}

a:hover {
  color: var(--text-color);
}

.contact {
  text-align: center;
}

h3 {
  color: var(--text-color);
  font-size: 16px;
}