/* ============================================
   Base — Reset, Typography, Layout
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-light);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-surface-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* --- Typography --- */

h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: var(--weight-regular);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }

p {
  max-width: 62ch;
}

.label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-accent);
}

/* --- Layout --- */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding-block: var(--space-20);
}

.section--dark {
  background-color: var(--color-surface-dark);
  color: var(--color-text-on-dark);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4,
.section--dark h5 {
  color: var(--color-text-on-dark);
}

.section--muted {
  background-color: var(--color-surface-muted);
}

/* --- Utilities --- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 768px) {
  .section {
    padding-block: var(--space-16);
  }
}