:root {
  /* (Dark Mode Elements) */
  --color-neutral-dark-blue: hsl(209, 23%, 22%);
  /* (Dark Mode Background) */
  --color-neutral-very-dark-blue: hsl(207, 26%, 17%);
  /* (Light Mode Input) */
  --color-neutral-dark-gray: hsl(0, 0%, 52%);

  --color-neutral-light-gray: hsl(0, 0%, 94%);

  /* (Light Mode Background) */
  --color-neutral-very-light-gray: hsl(0, 0%, 98%);

  /* (Dark Mode Text & Light Mode Elements) */
  --color-white: hsl(0, 0%, 100%);
  /* (Light Mode Text) */
  --color-black: hsl(200, 15%, 8%);

  --font-size-300: 0.75rem;
  --font-size-400: 0.875rem;
  --font-size-500: 1rem;
  --font-size-600: 1.5rem;

  --font-weight-light: 300;
  --font-weight-regular: 600;
  --font-weight-bold: 800;

  --bg-color-primary: var(--color-white);
  --bg-color-secondary: var(--color-neutral-very-light-gray);

  --text-color-primary: var(--color-black);
  --text-color-secondary: var(--color-neutral-dark-gray);

  --input-color: var(--color-neutral-dark-gray);

  --box-shadow: var(--color-neutral-light-gray);
}

@media (prefers-color-scheme: dark) {
  :root:not([theme='light']) {
    --bg-color-primary: var(--color-neutral-dark-blue);
    --bg-color-secondary: var(--color-neutral-very-dark-blue);

    --text-color-primary: var(--color-white);
    --text-color-secondary: var(--color-neutral-light-gray);

    --input-color: var(--color-neutral-light-gray);

    --box-shadow: var(--color-neutral-dark-blue);
  }
}

body {
  background-color: var(--bg-color-secondary);
  color: var(--text-color-primary);
  display: flex;
  font-family: 'Nunito Sans', sans-serif;
  font-size: var(--font-size-400);
}

header {
  background-color: var(--bg-color-primary);
  box-shadow: 0 0 5px var(--box-shadow);
  min-height: 80px;
}

main {
  background-color: var(--bg-color-secondary);
  flex-grow: 1;
  overflow-y: auto;
}

.container {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

.header {
  height: 100%;
  padding-inline: 16px;
}

.header-title {
  font-size: var(--font-size-400);
}

.filter {
  align-items: center;
  background-color: var(--bg-color-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-inline: 16px;
}

.search {
  margin-block: 20px;
  position: relative;
}

.search-icon {
  -webkit-mask-image: url('../images/search.svg');
  -webkit-mask-size: cover;
  background: var(--text-color-primary);
  display: inline-block;
  height: 16px;
  left: 32px;
  mask-image: url('../images/search.svg');
  mask-size: cover;
  position: absolute;
  top: 22px;
  width: 16px;
}

.search-input {
  background-color: var(--bg-color-primary);
  border-radius: 4px;
  border: none;
  box-shadow: 0 0 5px var(--box-shadow);
  color: var(--text-color-primary);
  font-family: 'Nunito Sans', sans-serif;
  height: 48px;
  margin-block: 6px;
  min-width: 343px;
  outline: none;
  padding-inline: 75px;
}

.search-input::placeholder {
  color: var(--input-color);
  font-size: var(--font-size-300);
}

/* Select */
.region-select {
  border: none;
  box-shadow: 0 0 5px var(--box-shadow);
  height: 48px;
  outline: none;
  width: 200px;
}

/* Body */
.countries-list {
  display: grid;
  gap: 30px;
  grid-template-columns: repeat(auto-fill, 300px);
  justify-content: center;
  justify-items: center;
}

/* Footer */
footer {
  background-color: var(--bg-color-primary);
  color: var(--text-color-secondary);
  padding-block: 12px;
}

.attribution {
  font-size: 11px;
  text-align: center;
}

.attribution a {
  color: hsl(228, 45%, 44%);
}

/* Media queries  */
@media (min-width: 768px) {
  .header {
    padding-inline: 80px;
  }

  .header-title {
    font-size: var(--font-size-600);
  }

  .filter {
    padding: 28px;
    padding-inline: 80px;
  }

  .search-input::placeholder {
    font-size: var(--font-size-400);
  }
}