:root {
  --bg: #f8f9fa;
  --main-bg: #ffffff;
  --fg: #212529;
  --main-fg: #ffffff;
  --accent: #005792;
  --separator: #dee2e6;
  --muted: #484e53;
  --font: "Segoe UI", sans-serif;
}

body {
  margin: 0;
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--fg);
}

h1 {
  font-size: 2.5rem;
  color: var(--accent);
}

h2 {
  font-size: 1.75rem;
  color: var(--accent);
}

main {
  display: grid;
  grid-template-rows: repeat(3, 1fr);
  grid-template-columns: repeat(3, 1fr);
  width: 100vw;
  height: 100vh;
}

header {
  background-color: var(--main-bg);
  border-bottom: 1px solid var(--separator);
  padding: 2rem 0;
  grid-row: 1;
  grid-column-start: 1;
  grid-column-end: 4;
  max-height: 250px;
  display: grid;
  grid-template-rows: 1fr;
}

section {
  border-bottom: 1px solid var(--separator);
  grid-row-start: 2;
  grid-row-end: 4;
  grid-column-start: 1;
  grid-column-end: 4;
  height: 100%;
  overflow-y: auto;
}

@media only screen and (max-width: 720px) {
  section {
    padding: 10px 1rem 10px 1rem;
  }
  header {
    padding: 10px 1rem 10px 1rem;
  }
}

@media only screen and (min-width: 720px) {
  section {
    padding: 10px 10rem 10px 10rem;
  }
  header {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media only screen and (min-width: 1080px) {
  section {
    padding: 10px 20rem 10px 20rem;
  }
}

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

a:hover {
  text-decoration: underline;
}

footer {
  background-color: var(--main-bg);
  color: var(--muted);
  text-align: center;
  padding: 1rem 0;
  font-size: 1rem;
  border-top: 1px solid var(--separator);
  width: 100%;
  grid-row: 4;
  grid-column-start: 1;
  grid-column-end: 4;
  max-height: 50px;
}

.toggle-container {
  grid-column: 3;
  grid-row: 1;
}

.header-content {
  grid-row: 1;
  grid-column: 2;
  align-content: center;
}

.mode-toggle {
  background: none;
  border: 1px solid var(--muted);
  color: var(--fg);
  padding: 0.5rem 1rem;
  border-radius: 1rem;
  cursor: pointer;
  font-size: 1rem;
  grid-column: 3;
}

:root[data-theme="dark"] {
  --bg: #121417;
  --main-bg: #1e1f22;
  --fg: #e9ecef;
  --main-fg: #ffffff;
  --accent: #4dabf7;
  --separator: #343a40;
  --muted: #adb5bd;
  --font: "Segoe UI", sans-serif;
}