/*
  Name: Julian Burnley
  Project: Lesson 11 Project
*/

@import url(
  "https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,400;0,600;0,700;1,600&family=Montserrat:wght@400;500;600;700&family=Share+Tech+Mono&display=swap"
);

/* =========================
   Variables
   ========================= */

:root {
  --main-color-100: hsl(225, 100%, 96%);
  --main-color-200: hsl(225, 78%, 90%);
  --main-color-400: hsl(231, 75%, 72%);
  --main-color-600: hsl(226, 70%, 56%);
  --main-color-800: hsl(225, 55%, 25%);

  --accent-color-100: hsl(48, 90%, 92%);
  --accent-color-400: hsl(43, 78%, 58%);
  --accent-color-600: hsl(27, 65%, 28%);
  --accent-color-800: hsl(224, 52%, 12%);

  --color-surface: hsl(0, 0%, 100%);
  --color-text: hsl(224, 35%, 17%);
  --color-muted: hsl(224, 15%, 40%);
  --color-border: hsl(226, 32%, 78%);

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

  --shadow-small: 0 0.5rem 1.25rem hsl(225 50% 15% / 12%);
  --shadow-large: 0 1.25rem 3rem hsl(225 50% 15% / 18%);

  --radius-small: 0.65rem;
  --radius-medium: 1rem;
  --radius-large: 1.5rem;

  --page-width: 74rem;
}

/* =========================
   Reset
   ========================= */

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;

  display: flex;
  flex-direction: column;

  background:
    radial-gradient(
      circle at top left,
      hsl(43 90% 75% / 25%),
      transparent 25rem
    ),
    linear-gradient(
      145deg,
      var(--main-color-100),
      hsl(225, 100%, 98%)
    );

  color: var(--color-text);

  font-family: var(--font-main);
  line-height: 1.75;
}

/* =========================
   General Typography
   ========================= */

h1,
h2,
h3 {
  font-family: var(--font-headings);
  line-height: 1.15;
}

h1 {
  color: var(--accent-color-800);
  font-size: clamp(2.6rem, 8vw, 5rem);
}

h2 {
  color: var(--main-color-800);
  font-size: clamp(2rem, 5vw, 3rem);
}

h3 {
  color: var(--accent-color-600);
  font-size: 1.45rem;
}

p {
  max-width: 75ch;
}

a {
  color: var(--main-color-800);
  text-underline-offset: 0.2rem;
}

a:hover {
  color: var(--accent-color-600);
}

code {
  font-family: var(--font-code);
}

/* =========================
   Accessibility
   ========================= */

.skip-link {
  position: fixed;
  top: -5rem;
  left: 1rem;
  z-index: 1000;

  padding: 0.8rem 1.1rem;

  border-radius: 0 0 var(--radius-small) var(--radius-small);

  background-color: var(--accent-color-800);
  color: white;

  font-weight: 700;
  text-decoration: none;

  transition: top 180ms ease;
}

.skip-link:focus {
  top: 0;
}

/* =========================
   Header
   ========================= */

.site-header {
  position: relative;

  padding: 4rem 1rem 0;

  overflow: hidden;

  background:
    linear-gradient(
      135deg,
      hsl(225 100% 96% / 96%),
      hsl(43 90% 88% / 92%)
    );

  border-bottom: 0.3rem solid var(--accent-color-400);

  text-align: center;
}

.site-header::before {
  content: "";

  position: absolute;
  width: 18rem;
  height: 18rem;
  top: -10rem;
  right: -4rem;

  border: 2rem solid hsl(231 75% 72% / 20%);
  border-radius: 50%;
}

.header-content {
  position: relative;
  z-index: 1;

  width: min(100%, 65rem);
  margin-inline: auto;
}

.eyebrow {
  margin-bottom: 0.5rem;

  color: var(--accent-color-600);

  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.subtitle {
  margin: 1rem auto 0;

  color: var(--color-muted);

  font-family: var(--font-headings);
  font-size: 1.25rem;
  font-style: italic;
}

/* =========================
   Navigation
   ========================= */

.main-navigation {
  position: relative;
  z-index: 1;

  width: min(100%, var(--page-width));
  margin: 2.5rem auto 0;
}

.main-navigation ul {
  display: flex;
  justify-content: center;
  gap: 0.6rem;

  list-style: none;
}

.main-navigation li {
  list-style: none;
}

.main-navigation a {
  display: block;

  padding: 0.85rem 1.4rem;

  border: 1px solid var(--color-border);
  border-bottom: none;
  border-radius: var(--radius-small) var(--radius-small) 0 0;

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

  font-weight: 700;
  text-decoration: none;

  box-shadow: var(--shadow-small);

  transition:
    background-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.main-navigation a:hover,
.main-navigation a:focus-visible,
.main-navigation a[aria-current="page"] {
  background-color: var(--main-color-800);
  color: white;

  transform: translateY(-0.2rem);
}

.main-navigation a:focus-visible {
  outline: 0.2rem solid var(--accent-color-400);
  outline-offset: 0.2rem;
}

/* =========================
   Main Content
   ========================= */

main {
  width: min(calc(100% - 2rem), var(--page-width));
  margin-inline: auto;
  padding: 4rem 0 5rem;

  flex: 1;
}

.topic-section,
.reflection-section,
.next-steps-section {
  margin-bottom: 2rem;
  padding: clamp(1.5rem, 5vw, 3rem);

  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);

  background-color: var(--color-surface);

  box-shadow: var(--shadow-large);
}

.topic-section p + p,
.reflection-section p + p,
.next-steps-section p + p {
  margin-top: 1rem;
}

.section-heading {
  margin-bottom: 1.5rem;

  display: flex;
  align-items: center;
  gap: 1rem;

  border-bottom: 0.15rem solid var(--main-color-200);
}

.section-number {
  min-width: 3rem;
  padding: 0.5rem;

  border-radius: var(--radius-small) var(--radius-small) 0 0;

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

  font-family: var(--font-code);
  font-weight: 700;
  text-align: center;
}

.section-heading h2 {
  padding-bottom: 0.5rem;
}

/* =========================
   Cards and Grids
   ========================= */

.topic-grid {
  margin-top: 1.5rem;

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

.information-card {
  padding: 1.4rem;

  border: 1px solid var(--color-border);
  border-left: 0.35rem solid var(--main-color-600);
  border-radius: var(--radius-medium);

  background:
    linear-gradient(
      145deg,
      var(--color-surface),
      var(--main-color-100)
    );

  box-shadow: var(--shadow-small);

  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.information-card:hover {
  border-left-color: var(--accent-color-400);

  box-shadow: var(--shadow-large);
  transform: translateY(-0.3rem);
}

.information-card h3 {
  margin-bottom: 0.75rem;
}

.information-card p + p {
  margin-top: 0.75rem;
}

/* =========================
   Lists
   ========================= */

.resource-list,
.check-list {
  margin-top: 1.25rem;
  padding-left: 1.25rem;
}

.resource-list li,
.check-list li {
  margin-bottom: 0.8rem;
  padding-left: 0.5rem;
}

.resource-list li::marker,
.check-list li::marker {
  color: var(--main-color-600);
}

.resource-list a {
  font-weight: 700;
}

.subsection-title {
  margin-top: 2rem;
}

/* =========================
   References and APA Indent
   ========================= */

.reference-list {
  display: grid;
  gap: 1rem;
}

.reference-list p {
  margin-left: 2rem;
  text-indent: -2rem;

  overflow-wrap: anywhere;
}

.reference-list a {
  font-family: var(--font-code);
  font-size: 0.92rem;
}

/* =========================
   Footer
   ========================= */

.site-footer {
  position: relative;

  overflow: hidden;

  background:
    radial-gradient(
      circle at top right,
      hsl(43 78% 58% / 20%),
      transparent 25rem
    ),
    linear-gradient(
      135deg,
      var(--main-color-800),
      var(--accent-color-800)
    );

  color: white;
}

.site-footer::before {
  content: "";

  position: absolute;
  inset: 0 0 auto;

  height: 0.3rem;

  background:
    linear-gradient(
      90deg,
      var(--main-color-400),
      var(--accent-color-400),
      var(--main-color-400)
    );
}

.footer-content {
  width: min(calc(100% - 2rem), var(--page-width));
  margin-inline: auto;
  padding: 2.5rem 0 1.75rem;

  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 2rem;
}

.footer-title {
  margin-bottom: 0.5rem;

  color: white;

  font-family: var(--font-headings);
  font-size: 1.5rem;
  font-weight: 700;
}

.footer-description {
  color: var(--main-color-200);
}

.footer-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
}

.footer-details p {
  padding: 0.8rem;

  border: 1px solid hsl(0 0% 100% / 16%);
  border-radius: var(--radius-small);

  background-color: hsl(0 0% 100% / 8%);
}

.footer-details span {
  display: block;
  margin-bottom: 0.25rem;

  color: var(--main-color-200);

  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer-details a,
.footer-bottom a {
  color: white;
}

.footer-bottom {
  width: min(calc(100% - 2rem), var(--page-width));
  margin-inline: auto;
  padding: 1rem 0 1.5rem;

  display: flex;
  justify-content: space-between;
  gap: 1rem;

  border-top: 1px solid hsl(0 0% 100% / 15%);

  color: var(--main-color-200);

  font-size: 0.85rem;
}

.theme-toggle {
  margin: 1.25rem auto;
  padding: 0.7rem 1.1rem;
  border: 2px solid var(--main-color-800);
  border-radius: var(--radius-small);
  background-color: var(--main-color-800);
  color: white;
  cursor: pointer;
  font: 700 0.95rem var(--font-main);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background-color: var(--accent-color-600);
  outline: 3px solid var(--accent-color-400);
  outline-offset: 3px;
}

.credential-cards {
  width: min(calc(100% - 2rem), 62rem);
  margin-inline: auto;
  padding: 2.75rem 0;
  display: grid;
  grid-template-columns:
    minmax(10rem, 1fr)
    minmax(20rem, 1.8fr)
    minmax(10rem, 1fr);
  gap: 0.75rem;
}

.credential-cards p {
  max-width: none;
  padding: 1rem;
  border: 1px solid hsl(0 0% 100% / 20%);
  border-radius: var(--radius-small);
  background-color: hsl(0 0% 100% / 9%);
}

.credential-cards strong,
.credential-cards span,
.credential-cards a,
.credential-cards time {
  display: block;
}

.credential-cards a {
  color: white;
  font-weight: 700;
  overflow-wrap: anywhere;
}

body.dark-mode {
  --main-color-100: hsl(224, 30%, 9%);
  --main-color-200: hsl(224, 25%, 18%);
  --main-color-400: hsl(231, 55%, 62%);
  --main-color-600: hsl(226, 65%, 70%);
  --main-color-800: hsl(225, 55%, 88%);
  --accent-color-100: hsl(43, 28%, 17%);
  --accent-color-400: hsl(43, 78%, 62%);
  --accent-color-600: hsl(43, 78%, 72%);
  --accent-color-800: hsl(224, 52%, 8%);
  --color-surface: hsl(224, 28%, 14%);
  --color-text: hsl(225, 35%, 92%);
  --color-muted: hsl(225, 18%, 72%);
  --color-border: hsl(226, 22%, 35%);
  background: linear-gradient(145deg, hsl(224, 30%, 9%), hsl(225, 28%, 13%));
}

body.dark-mode .site-header {
  background: linear-gradient(135deg, hsl(224, 30%, 12%), hsl(43, 28%, 15%));
}

body.dark-mode .site-header h1,
body.dark-mode .site-header p {
  color: var(--color-text);
}

body.dark-mode .theme-toggle {
  border-color: var(--accent-color-400);
  background-color: var(--accent-color-400);
  color: hsl(224, 40%, 10%);
}

/* =========================
   Responsive Design
   ========================= */

@media (max-width: 850px) {
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .footer-details {
    grid-template-columns: 1fr;
  }

  .credential-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 650px) {
  .site-header {
    padding-top: 2.5rem;
  }

  .main-navigation ul {
    flex-direction: column;
    gap: 0;
  }

  .main-navigation a {
    border: 1px solid var(--color-border);
    border-radius: 0;
  }

  main {
    width: min(calc(100% - 1rem), var(--page-width));
    padding-top: 2rem;
  }

  .topic-section,
  .reflection-section,
  .next-steps-section {
    padding: 1.25rem;

    border-radius: var(--radius-medium);
  }

  .section-heading {
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

/* =========================
   Reduced Motion
   ========================= */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}