:root {
  color-scheme: light dark;
  font-family: "Lucida Console", "Courier New", Monaco, monospace;
  --background: #FCFCFC;
  --text: #0000AA;
  --heading: #000082;
  --spacer: 0.5rem;
  --max-width: 1440px;
  --border-colour: rgb(from var(--text) r g b / 0.5);

  @supports (width: -moz-available) {
    --stretch: -moz-available;
  }
  @supports (width: -webkit-fill-available) {
    --stretch: -webkit-fill-available;
  }
  @supports (width: stretch) {
    --stretch: stretch;
  }
}

[data-theme=dark] {
  --background: #0000AA;
  --text: #FCFCFC;
  --heading: #FFFFFF;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  background-repeat: no-repeat;
}

* {
  background-color: var(--background);
  color: var(--text);
  scroll-behavior: smooth;
}

body {
  width: 100%;
  margin: 0;
}

header {
  display: flex;
  justify-content: center;
  border-block-end: thin solid var(--border-colour);
  nav {
    border-block-start: thin solid var(--border-colour);
  }
  nav ul:first-child {
    flex-grow: 1;
    li {
      width: 100%;
    }
  }
}

nav {
  flex-grow: 1;
  justify-content: space-between;
  max-width: var(--max-width);
  margin-inline: calc(var(--spacer) * 2);
  padding-inline: var(--spacer);
  border-inline: thin solid var(--border-colour);
}

nav, nav ul {
  display: flex;
}

nav ul {
  list-style: none;
  align-items: center;
  margin-block: 0;
  padding: 0;
  gap: var(--spacer);
  .desktop-nav {
    display: none;
    @media (min-width: 768px) {
      display: inline;
    }
  }
  .mobile-nav {
    @media (min-width: 768px) {
      display: none;
    }
  }
}

nav li {
  margin: 0;
  padding: calc(var(--spacer) * 2) var(--spacer);
}

nav li :where(a, [role=link]) {
  color: var(--heading);
  margin: calc(var(--spacer) * -1);
  padding: var(--spacer);
  font-weight: bold;
  letter-spacing: calc(var(--spacer) * 0.5);
}

#mobileMenu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  border: none;
  max-width: unset;
  z-index: 9999;
  ul {
    flex-direction: column;
    align-items: start;
    width: var(--stretch);
    margin-inline: calc(var(--spacer) * 2);
    padding-inline: var(--spacer);
    border: thin solid var(--border-colour);
    & > li:first-child {
      margin-top: calc(var(--spacer) * 0.7);
    }
    li {
      width: 100%;
    }
  }
  #close {
    position: absolute;
    top: calc(var(--spacer) * 2);
    right: calc(var(--spacer) * 4);
  }
}

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

main section {
  max-width: var(--max-width);
  margin-inline: calc(var(--spacer) * 2);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--heading);
  letter-spacing: calc(var(--spacer) * 0.5);
}

h2 {
  a {
    text-decoration: none;
  }
}

a {
  text-underline-offset: calc(var(--spacer) * 0.5);
}

img {
  max-width: 100%;
  height: auto;
  border-style: none
}

button {
  border: none;
}

#banner {
  width: var(--stretch);
  border-inline: thin solid var(--border-colour);
  border-block-end: thin solid var(--border-colour);
  padding-inline: calc(var(--spacer) * 2);
}

#about {
  width: var(--stretch);
  border: thin solid var(--border-colour);
  margin-top: calc(var(--spacer) * 2);
  padding-inline: calc(var(--spacer) * 2);
}

#skills {
  width: var(--stretch);
  margin-top: calc(var(--spacer) * 2);
  border: thin solid var(--border-colour);
  h2 {
    padding-inline: calc(var(--spacer) * 2);
  }
  p {
    padding-inline: calc(var(--spacer) * 2);
    padding-block-end: calc(var(--spacer) * 2);
    margin-block-end: 0;
    border-block-end: thin solid var(--border-colour);
  }
  article {
    padding: calc(var(--spacer) * 2);
    p {
      text-align: center;
      font-weight: bold;
      letter-spacing: calc(var(--spacer) * 0.5);
      padding: 0;
      border-block-end: none;
    }
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
    @media (min-width: 768px) {
      grid-template-columns: repeat(4, 1fr);
    }
  }
}

#portfolio {
  width: var(--stretch);
  border-inline: thin solid var(--border-colour);
  border-block-end: thin solid var(--border-colour);
  h1, h2 {
    padding-inline: calc(var(--spacer) * 2);
  }
  p {
    padding-inline: calc(var(--spacer) * 2);
    padding-block-end: calc(var(--spacer) * 2);
    margin-block-end: 0;
    border-block-end: thin solid var(--border-colour);
  }
  article {
    text-align: center;
    padding: calc(var(--spacer) * 6);
  }
  .grid {
    grid-template-columns: repeat(1, 1fr);
    @media (min-width: 768px) {
      grid-template-columns: repeat(3, 1fr);
    }
    p {
      font-weight: bold;
      letter-spacing: calc(var(--spacer) * 0.5);
      border-block-end: none;
    }
  }
}

#contact {
  width: var(--stretch);
  margin-top: calc(var(--spacer) * 2);
  border: thin solid var(--border-colour);
  padding-inline: calc(var(--spacer) * 2);
}

#info {
  width: var(--stretch);
  margin-top: calc(var(--spacer) * 2);
  border-block-start: thin solid var(--border-colour);
  border-inline: thin solid var(--border-colour);
  padding-inline: calc(var(--spacer) * 2);
  nav {
    margin: 0;
    padding: 0;
    padding-block-end: calc(var(--spacer) * 2);
    border: none;
    ul {
      flex-direction: column;
      align-items: start;
      flex-grow: 1;
      li {
        width: 100%;
      }
    }
  }
}

footer {
  display: flex;
  justify-content: center;
  border-block-start: thin solid var(--border-colour);
  section {
    align-items: center;
    width: 100%;
    max-width: var(--max-width);
    text-align: center;
    margin-inline: calc(var(--spacer) * 2);
    border-inline: thin solid var(--border-colour);
    border-block-end: thin solid var(--border-colour);
    padding-inline: calc(var(--spacer) * 2);
  }
  details {
    margin-block-start: calc(var(--spacer) * 6);
    min-height: calc(var(--spacer) * 12);
  }
  .footer-theme {
    text-align: end;
  }
}

.grid {
  display: grid;
  gap: 1px;
  background-color: var(--border-colour);
}

.hidden {
  display: none;
}

.fixed {
  position: fixed;
}