@font-face {
  font-family: "Overlock";
  src: local("Overlock"), url("../fonts/Overlock-Regular.ttf");
}

@font-face {
  font-family: "Overlock";
  src: local("Overlock Bold"), url("../fonts/Overlock-Bold.ttf");
  font-weight: bold;
}

:root {
  --clr-accent-300: hsl(39 94% 57%);
  --clr-accent-400: hsl(39 100% 41%);

  --clr-sale: hsl(350 67% 43%);

  --clr-neutral-100: hsl(0 0% 100%);
  --clr-neutral-800: hsl(0 0% 20%);
  --clr-neutral-900: hsl(0 0% 0%);

  --ff-base: system-ui, sans-serif;
  --ff-accent: Overlock, serif;

  --fs-200: 0.875rem;
  --fs-300: 0.925rem;
  --fs-400: 1rem;
  --fs-500: 1.25rem;
  --fs-600: 1.325rem;
  --fs-700: 2rem;
  --fs-800: 2.5rem;

  @media (width > 720px) {
    --fs-300: 1rem;
    --fs-400: 1.125rem;
    --fs-500: 1.3125rem;
    --fs-600: 1.5rem;
    --fs-700: 2.5rem;
    --fs-800: 3rem;
  }
}

* {
  box-sizing: border-box;
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes move-up {
  from {
    translate: 0 100px;
  }
  to {
    translate: 0 0;
  }
}

body {
  color: var(--clr-neutral-800);
  font-size: var(--fs-400);
  font-family: var(--ff-base);
  line-height: 1.6;
  margin: 0;
}

h1,
h2 {
  color: var(--clr-accent-400);
  font-family: var(--ff-accent);
  line-height: 1.1;
}

h1 {
  font-size: var(--fs-800);
}

h1 span {
  display: block;
  font-size: 0.75em;
  font-weight: lighter;
  color: var(--clr-neutral-800);
}

h2 {
  text-align: center;
  font-size: var(--fs-700);
}

h3 {
  font-size: var(--fs-600);
}

a {
  color: var(--clr-accent-400);
}

a:hover,
a:focus-visible {
  color: inherit;
}

.button {
  font: inherit;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--clr-accent-300);
  border: 0;
  padding: 0.75em 1.5em;
}

.button:hover,
.button:focus-visible {
  background: var(--clr-neutral-800);
  color: var(--clr-accent-300);
}

.lede {
  font-size: var(--fs-500);
}

.wrapper {
  max-inline-size: 900px;
  margin-inline: auto;
  padding-inline: 1rem;
}

.three-columns {
  display: grid;
  gap: 1rem;

  @media (width > 720px) {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-header {
  background: var(--clr-neutral-900);
  padding: 1rem;
}

.page-header-layout {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: space-between;
}

.primary-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;

  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.primary-nav a {
  text-decoration: none;
  color: var(--clr-neutral-100);
  font-weight: 700;

  &:hover,
  &:focus-visible {
    color: var(--clr-accent-300);
  }
}

.hero {
  animation: fade-in 2s, move-up 2s;
  padding-block: 100px;
  background-image: url(../images/chess-bg.jpg);
  background-size: cover;
}

.hero-content {
  opacity: 0;
  animation: fade-in 2s forwards, move-up 2s;
  animation-delay: 0.5s;

  text-align: center;
  background: hsl(0 0% 100% / 0.8);
  padding: 40px;
}

.hero-content > :first-child {
  margin-block-start: 0;
}

.hero-content > :last-child {
  margin-block-end: 0;
}

.hero ~ * {
  opacity: 0;
  animation: fade-in 2s 1s forwards;
}

.course {
  --transition-duration: 325ms;

  padding: 100px 21px 21px;
  color: var(--clr-neutral-100);
  /* background: hsl(0 0% 0%); */
  font-size: var(--fs-300);

  position: relative;

  display: grid;
  gap: 1rem;
  align-content: end;

  overflow: hidden;
}

.course > * {
  margin: 0;
}

.course-title {
  line-height: 1.1;
}

/* .course-description {
  translate: 0 100px;
  transition: translate var(--transition-duration);
} */

.course-tag {
  position: absolute;
  top: 16px;
  left: 0;

  font-family: var(--ff-accent);
  font-weight: 700;
  background: var(--clr-accent-300);
  color: var(--clr-neutral-900);
  padding: 0.25em 0.5em;
}

.course.sale {
  .course-title::after {
    content: "Sale";
    position: absolute;
    left: 0;
    top: 55px;
    font-size: var(--fs-400);
    font-family: var(--ff-accent);
    font-weight: 700;
    background: var(--clr-sale);
    color: var(--clr-neutral-100);
    padding: 0.25em 0.5em;
  }
}

.course.featured::before {
  content: "⭐" / "Featured course";
  position: absolute;
  top: 0;
  right: 16px;
  padding: 4px;
  left: auto;
  font-size: var(--fs-300);
  background: var(--clr-neutral-900);
}

.course-image {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;

  transition: scale var(--transition-duration);
}

.course:hover {
  .course-image {
    scale: 1.1;
  }

  /* .course-description {
    translate: 0;
  } */
}

.page-footer {
  text-align: center;
  background-image: linear-gradient(#444, #000);
  color: var(--clr-neutral-100);
  padding: 50px;
  margin-block-start: 100px;
}