/*
Name: Julian Burnley
Course: CIS233DA
Section: 12988
Instructor: Brian Thurber
*/

@import url(
  "https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,400;0,700;1,600&family=Montserrat&family=Share+Tech+Mono&display=swap"
);

/* ===========================
   COLOR AND FONT SYSTEM
   =========================== */

:root {
  --main-color-100: hsl(218, 50%, 95%);
  --main-color-400: hsl(218, 60%, 65%);
  --main-color-600: hsl(218, 60%, 45%);
  --main-color-800: hsl(218, 60%, 15%);

  --accent-color-50: hsl(38, 55%, 96%);
  --accent-color-100: hsl(38, 50%, 90%);
  --accent-color-400: hsl(38, 55%, 65%);
  --accent-color-600: hsl(38, 40%, 40%);
  --accent-color-800: hsl(38, 20%, 15%);

  --font-headings: "Crimson Pro", Georgia, serif;
  --font-main: "Montserrat", Verdana, sans-serif;
  --font-code: "Share Tech Mono", Consolas, monospace;
}

/* ===========================
   GLOBAL RESET
   =========================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto 1fr auto;

  font-family: var(--font-main);
  color: var(--main-color-800);
  background-color: var(--main-color-100);
  line-height: 1.4;
}

button,
input,
select,
textarea {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

/* ===========================
   HEADER
   =========================== */

header {
  position: relative;
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;

  padding: 1rem;
  background-color: var(--accent-color-100);
  box-shadow: 0 2px 6px var(--main-color-600);
}

header h1 {
  text-align: center;
  font-family: var(--font-headings);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--main-color-800);
}

button.gradient,
#toggleTheme {
  position: absolute;
  top: 50%;
  right: 1rem;
  transform: translateY(-50%);

  padding: 0.55rem 1rem;
  border: thin solid var(--accent-color-600);
  border-radius: 0.5rem;

  background-image: linear-gradient(
    to right,
    var(--accent-color-400),
    var(--accent-color-600)
  );

  color: var(--accent-color-100);
  font-weight: 700;
  cursor: pointer;

  transition:
    background 0.3s ease,
    transform 0.2s ease;
}

button.gradient:hover,
#toggleTheme:hover {
  background-image: linear-gradient(
    to right,
    var(--accent-color-600),
    var(--accent-color-800)
  );
}

button.gradient:focus-visible,
#toggleTheme:focus-visible {
  outline: 3px solid var(--main-color-800);
  outline-offset: 3px;
}

/* ===========================
   NAVIGATION
   =========================== */

nav {
  background-image: linear-gradient(
    195deg,
    var(--main-color-400),
    var(--main-color-600)
  );

  box-shadow: 2px 0 3px var(--main-color-800);
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
}

nav a {
  display: flex;
  align-items: center;
  gap: 0.4rem;

  padding: 1rem;
  color: var(--accent-color-100);
  font-weight: 600;
  text-decoration: none;

  transition: background-image 0.3s ease;
}

nav a:hover,
nav a:focus-visible,
nav a[aria-current="page"] {
  background-image: linear-gradient(
    to top,
    var(--main-color-800),
    var(--main-color-600)
  );
}

nav a:focus-visible {
  outline: 3px solid var(--accent-color-100);
  outline-offset: -4px;
}

nav .material-icons {
  font-size: 1.2rem;
}

/* ===========================
   MAIN CONTENT
   =========================== */

main {
  width: 100%;
  padding: 1rem;
  align-self: start;
}

main h2 {
  display: flex;
  align-items: center;
  gap: 0.4rem;

  font-family: var(--font-headings);
  font-size: 1.7rem;
  line-height: 1.1;
}

.introduction {
  max-width: 75rem;
  margin-top: 0.25rem;
}

/* ===========================
   TAB COMPONENT
   =========================== */

.tab-component {
  width: min(80%, 70rem);
  margin: 1rem auto;
}

.tab-menu {
  position: relative;
  z-index: 2;
}

.tab-list {
  display: flex;
  align-items: flex-end;

  list-style: none;
  padding: 0;
  margin: 0;
}

.tab-list li {
  display: flex;
}

/* Tab buttons */

.tab {
  min-height: 3.25rem;
  padding: 0.85rem 1rem;

  border: thin solid var(--main-color-800);
  border-top-width: thick;
  border-radius: 0.5rem 0.5rem 0 0;

  background-color: var(--accent-color-100);
  color: var(--main-color-800);

  text-transform: uppercase;
  cursor: pointer;

  transition:
    background 0.25s ease,
    color 0.25s ease,
    border-color 0.25s ease;
}

/* Remove overlapping side borders */

.tab-list li + li .tab {
  margin-left: -1px;
}

/* Selected tab */

.tab[aria-selected="true"] {
  position: relative;
  z-index: 3;

  background-color: var(--accent-color-100);
  border-color: var(--main-color-800);
  border-bottom-color: var(--accent-color-100);
}

/* Inactive tabs */

.tab[aria-selected="false"] {
  background-color: var(--accent-color-50);
  border-color: var(--main-color-400);
  border-bottom-color: var(--main-color-800);
}

/* Hover and focus states */

.tab:hover {
  border-color: var(--accent-color-600);

  background-image: linear-gradient(
    to top,
    var(--accent-color-800),
    var(--accent-color-600)
  );

  color: var(--accent-color-100);
}

.tab:focus-visible {
  position: relative;
  z-index: 4;

  outline: 3px solid var(--main-color-600);
  outline-offset: 2px;
}

/* ===========================
   TAB CONTENT
   =========================== */

.tab-content {
  position: relative;
  top: -1px;
  z-index: 1;

  min-height: 6rem;
  padding: 1rem;

  border: thin solid var(--main-color-800);
  border-radius: 0 0.5rem 0.5rem 0.5rem;

  background-color: var(--accent-color-100);
  color: var(--main-color-800);

  box-shadow: 0 2px 6px rgb(0 0 0 / 15%);
}

.tab-content[hidden] {
  display: none;
}

.tab-content:focus {
  outline: none;
}

.tab-content:focus-visible {
  outline: 3px solid var(--main-color-600);
  outline-offset: 3px;
}

/* ===========================
   CODE EXAMPLES
   =========================== */

.code-examples {
  width: min(90%, 80rem);
  margin: 0 auto 1.5rem;

  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.code-block {
  min-width: 0;
  padding: 1rem;

  display: grid;
  grid-template-rows: auto 1fr;

  border: thin solid var(--accent-color-600);
  border-radius: 0.5rem;

  background-color: white;
  box-shadow: 0 4px 10px rgb(0 0 0 / 15%);
}

.code-block figcaption {
  padding-bottom: 0.5rem;
  font-weight: 700;
}

.code-block pre {
  max-width: 100%;
  min-height: 100%;
  overflow: auto;

  padding: 0.75rem;
  border-radius: 0.5rem;

  background-color: var(--main-color-800);
  color: var(--main-color-100);

  font-family: var(--font-code);
  font-size: 0.85rem;
  line-height: 1.35;

  white-space: pre-wrap;
  overflow-wrap: anywhere;
  tab-size: 2;
}

.code-block code {
  font-family: inherit;
}

/* HTML code spans both columns */

#html {
  grid-column: 1 / -1;
}

#css {
  grid-column: 1;
}

#javascript {
  grid-column: 2;
}

/* ===========================
   COLLAPSIBLE COMPONENT
   =========================== */

.collapsible {
  margin: 1.5rem 0;
  overflow: hidden;

  border-radius: 0.5rem;
  box-shadow: 0 4px 10px -4px var(--main-color-600);
}

.collapse-toggle {
  width: 100%;
  padding: 1rem;

  border: none;
  background-color: var(--main-color-400);
  color: var(--accent-color-100);

  font-weight: 700;
  text-align: left;
  cursor: pointer;

  transition: background-color 0.3s ease;
}

.collapse-toggle:hover {
  background-color: var(--main-color-600);
}

.collapse-content {
  display: none;
  padding: 1rem;
  background-color: var(--accent-color-100);
}

.collapsible.open .collapse-content {
  display: block;
}

/* ===========================
   DEFINITION LISTS
   =========================== */

dt {
  padding: 1rem 0;
  font-weight: 700;
}

dd {
  padding: 0 1rem;
}

/* ===========================
   FOOTER
   =========================== */

footer {
  min-height: 3rem;
  padding: 0.75rem 1rem;

  display: flex;
  justify-content: space-evenly;
  align-items: center;
  gap: 1rem;

  background-color: var(--accent-color-100);
  color: var(--main-color-800);

  font-size: 0.85rem;
}

footer p span {
  font-weight: 700;
}

/* ===========================
   SKIP NAVIGATION
   =========================== */

#skip-nav {
  position: absolute;
  top: 0;
  left: 0.5rem;
  z-index: 1000;

  padding: 0.5rem 1rem;
  border-radius: 0 0 0.5rem 0.5rem;

  background-color: var(--main-color-800);
  color: var(--accent-color-100);

  text-decoration: none;

  transform: translateY(-120%);
  transition: transform 200ms ease;
}

#skip-nav:focus {
  transform: translateY(0);
  outline: 3px solid var(--main-color-400);
  outline-offset: 2px;
}

/* ===========================
   DARK MODE
   =========================== */

body.dark-mode {
  --main-color-100: hsl(218, 20%, 10%);
  --main-color-400: hsl(218, 35%, 40%);
  --main-color-600: hsl(218, 45%, 55%);
  --main-color-800: hsl(218, 40%, 92%);

  --accent-color-50: hsl(218, 22%, 22%);
  --accent-color-100: hsl(218, 25%, 18%);
  --accent-color-400: hsl(38, 45%, 60%);
  --accent-color-600: hsl(38, 50%, 42%);
  --accent-color-800: hsl(38, 60%, 25%);

  background-color: var(--main-color-100);
  color: var(--main-color-800);
}

body.dark-mode header {
  background-color: hsl(38, 25%, 18%);
}

body.dark-mode nav {
  background-image: linear-gradient(
    195deg,
    hsl(218, 35%, 25%),
    hsl(218, 35%, 35%)
  );
}

body.dark-mode main {
  background-color: hsl(218, 25%, 14%);
}

body.dark-mode .tab-content,
body.dark-mode .collapse-content {
  background-color: hsl(218, 25%, 20%);
  color: hsl(218, 40%, 92%);
}

body.dark-mode .tab[aria-selected="true"] {
  background-color: hsl(218, 25%, 20%);
  border-bottom-color: hsl(218, 25%, 20%);
}

body.dark-mode .tab[aria-selected="false"] {
  background-color: hsl(218, 22%, 26%);
}

body.dark-mode .code-block {
  background-color: hsl(218, 18%, 18%);
  color: hsl(218, 40%, 92%);
}

body.dark-mode .code-block pre {
  background-color: hsl(218, 45%, 8%);
  color: hsl(218, 40%, 92%);
}

body.dark-mode footer {
  background-color: hsl(38, 25%, 18%);
  color: hsl(218, 40%, 92%);
}

/* ===========================
   RESPONSIVE LAYOUT
   =========================== */

@media (max-width: 800px) {
  header {
    padding-right: 1rem;
    padding-bottom: 4.5rem;
  }

  #toggleTheme {
    top: auto;
    right: 50%;
    bottom: 0.75rem;
    transform: translateX(50%);
  }

  .tab-component,
  .code-examples {
    width: 100%;
  }

  .code-examples {
    grid-template-columns: 1fr;
  }

  #html,
  #css,
  #javascript {
    grid-column: 1;
  }

  footer {
    flex-direction: column;
    gap: 0.25rem;
  }
}

@media (max-width: 480px) {
  main {
    padding: 0.75rem;
  }

  nav ul {
    flex-direction: column;
  }

  nav a {
    justify-content: center;
  }

  .tab {
    padding: 0.75rem;
    font-size: 0.8rem;
  }

  .tab-content {
    border-radius: 0 0.5rem 0.5rem 0.5rem;
  }

  .code-block {
    padding: 0.65rem;
  }

  .code-block pre {
    font-size: 0.76rem;
  }
}