:root {
  font-size: 100%; /* Equivalent to 16px */
  --background-color: #f4f4f4;
  --foreground-color: #fff;
  --text-color: #333;
  --text-secondary-color: #555;
  --text-link-color: blue;
  --border-color: rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
  body.dark-mode {
    --background-color: #1e2024;
    --foreground-color: #2c2e34;
    --text-color: #d1d1d6;
    --text-secondary-color: #aaa;
    --text-link-color: #a9a9ff;
    --border-color: rgba(255, 255, 255, 0.2);
  }
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/JetBrainsMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/JetBrainsMono-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
}

body {
  font-size: 1rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--text-color);
  background-color: var(--background-color);
  margin: 0;
  padding: 0.625rem;
}

header,
section,
footer {
  max-width: 50rem; /* 800px */
  margin: 1.25rem auto;
  padding: 1.25rem;
  background-color: var(--foreground-color);
  box-shadow: 0 0 0.625rem var(--border-color);
  border-radius: 0.625rem;
}

a {
  color: var(--text-link-color);
  text-decoration: none;
  /*margin: 0 0.3125rem;*/
}

header,
section h2,
section#nav,
footer {
  text-align: center;
}

header {
  margin-top: 3rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
}

.header-content h1 {
  margin-block-end: 0.27em;
}

.header-content h1,
.header-content p {
  margin-block-start: 0.27em;
}

.avatar {
  width: 6.25rem;
  height: 6.25rem;
  margin-top: -3.75rem;
  border-radius: 50%;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
  gap: 1.25rem;
}

.photo-item img {
  width: 100%;
  height: auto;
  transition: transform 0.3s ease;
  border-radius: 0.3125rem;
}

.photo-item img:hover {
  transform: scale(1.05);
}

.photo-item p {
  text-align: center;
  margin-top: 0.3125rem;
}

footer {
  font-size: 0.8rem;
  color: var(--text-secondary-color);
}

footer a {
  color: var(--text-secondary-color);
  text-decoration: none;
  margin: 0 0.3125rem;
}

button#themeToggle {
  margin-top: 0.625rem;
  padding: 0.5rem 0.9rem;
  border: none;
  border-radius: 0.3125rem;
  background-color: var(--text-secondary-color);
  color: var(--background-color);
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button#themeToggle:hover {
  background-color: var(--text-color);
}

.copyright {
  padding: 0.3125rem 0;
  max-width: 50rem;
  margin: 0 auto;
  text-align: center;
}

.copyright p {
  font-size: 0.7rem;
  margin-top: 0.625rem;
  text-align: center;
}