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

html {
  width: 100%;
}

body {
  min-height: 100vh;
  background: var(--color-black);
  color: var(--color-white);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-light);
  font-size: var(--font-size-base);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
button,
label,
nav,
footer,
.ui {
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

a {
  color: var(--color-white);
  text-decoration: none;
  border-bottom: 1px solid var(--color-line-grey);
  transition: border-color var(--transition-fast) ease,
    color var(--transition-fast) ease;
}

a:hover {
  border-bottom-color: var(--color-white);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 3px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--spacing-md);
  background: var(--color-black);
  color: var(--color-white);
  border: 1px solid var(--color-white);
  border-radius: 25px;
  font-family: var(--font-primary);
  font-weight: var(--font-weight-light);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background var(--transition-fast) ease,
    color var(--transition-fast) ease;
}

.btn:hover {
  background: var(--color-white);
  color: var(--color-black);
}

.btn[aria-pressed="true"] {
  background: var(--color-white);
  color: var(--color-black);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.field label {
  color: var(--color-line-grey);
  font-size: var(--font-size-xs);
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--color-white);
  cursor: pointer;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  min-height: 100vh;
}

.logo {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-light);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.1;
}

.subtitle {
  color: var(--color-line-grey);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
}

.lede {
  font-size: var(--font-size-base);
  max-width: 36em;
}

.site-footer {
  margin-top: auto;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-line-grey);
  color: var(--color-line-grey);
  font-size: var(--font-size-xs);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.lab-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.lab-item {
  border: 1px solid var(--color-line-grey);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.lab-item__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-normal);
}

.lab-item__controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.lab-item__sliders {
  display: grid;
  gap: var(--spacing-sm);
}

@media (min-width: 768px) {
  .page {
    padding: calc(var(--spacing-md) * 2);
    gap: calc(var(--spacing-md) * 1.5);
  }

  .lab-item__controls {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .lab-item__sliders {
    flex: 1;
    grid-template-columns: repeat(3, 1fr);
  }

  .site-footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}