/* Self-hosted. Jost stands in for Futura PT. SIL OFL 1.1, see fonts/OFL.txt */
@font-face {
  font-family: 'Jost';
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  src: url('../fonts/Jost-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Jost';
  font-weight: 500;
  font-style: normal;
  font-display: swap;
  src: url('../fonts/Jost-500.woff2') format('woff2');
}

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--face);
  font-weight: var(--weight-regular);
  -webkit-font-smoothing: antialiased;
}

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

/* Focus is the only saffron outside the mark. Never removed. */
:focus-visible {
  outline: 1px solid var(--saffron);
  outline-offset: 2px;
}

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

/* ---------- Mark page ---------- */

.mark-page {
  min-height: 100vh;
  cursor: pointer;
  position: relative;
}

.mark-page__lockup {
  position: absolute;
  left: var(--page-margin);
  top: 38vh;
}

.mark--full { width: 180px; height: 180px; display: block; }

.wordmark {
  font-size: var(--size-wordmark);
  font-weight: var(--weight-regular);
  letter-spacing: var(--track-wordmark);
  text-transform: lowercase;
  margin-top: var(--space-3);
  color: var(--ink);
}

/* ---------- Page shell ---------- */

.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--space-8) var(--page-margin);
  display: grid;
  grid-template-columns: var(--rail-width) 1fr;
  column-gap: var(--rail-gutter);
  min-height: 100vh;
}

/* ---------- Rail ---------- */

.rail { display: flex; flex-direction: column; }

.mark--rail { width: 44px; height: 44px; display: block; }

.nav {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav__item {
  font-size: var(--size-nav);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--track-nav);
  color: var(--ink);
  width: fit-content;
  border-bottom: 1px solid transparent;
  transition: border-color var(--hover) linear;
}

.nav__item:hover { border-bottom-color: var(--maroon); }

.nav__item--active { color: var(--maroon); }

.nav__item--contact {
  color: var(--ink-mute);
  margin-top: var(--space-6);
}

/* ---------- Image field ----------
   A fixed box. Photographs align to its top-left corner and are contained
   within it. The box never resizes, so a vertical frame and a horizontal
   frame share the same top edge and left edge. Nothing on the page moves
   when advancing. */

.field { display: flex; flex-direction: column; }

.image-field {
  width: var(--field-max-width);
  height: var(--field-max-height);
  position: relative;
}

.image-field__photo {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  object-position: left top;
  display: block;
  transition: opacity var(--fade) linear;
}

.image-field__photo--out { opacity: 0; }

/* Click regions are real buttons, not divs with handlers. */
.image-field__advance {
  position: absolute;
  top: 0;
  height: 100%;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.image-field__advance--prev { left: 0; width: 33.333%; }
.image-field__advance--next { left: 33.333%; width: 66.667%; }

/* ---------- Chrome: chevrons and counter, nothing else ---------- */

.chrome {
  width: var(--field-max-width);
  margin-top: var(--space-2);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.chevrons { display: flex; gap: var(--space-2); }

.chevron {
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
  color: var(--ink-mute);
  font-size: 16px;
  line-height: 1;
  transition: color var(--hover) linear;
}

.chevron:hover { color: var(--maroon); }

.counter {
  font-size: var(--size-counter);
  font-weight: var(--weight-regular);
  font-variant-numeric: tabular-nums;
  color: var(--ink-mute);
  font-style: normal;
}

/* ---------- Contact ---------- */

.sentence {
  font-size: var(--size-sentence);
  max-width: 34ch;
  margin: 0 0 var(--space-8) 0;
  line-height: 1.5;
}

.form { max-width: 420px; }

.field-group { margin-bottom: var(--space-4); }

.label {
  display: block;
  font-size: var(--size-label);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--track-nav);
  color: var(--ink);
  margin-bottom: var(--space-1);
}

.label__optional {
  color: var(--ink-mute);
  text-transform: none;
  letter-spacing: 0;
}

/* No boxes. A single rule. */
.input {
  width: 100%;
  height: var(--field-height);
  font-family: var(--face);
  font-size: var(--size-input);
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: var(--rule) solid var(--ink-mute);
  border-radius: var(--radius);
  padding: 0;
}

.input--message {
  height: calc(var(--field-height) * 3);
  resize: none;
  padding-top: var(--space-1);
}

.error {
  font-size: var(--size-counter);
  color: var(--maroon);
  margin-top: var(--space-1);
  display: none;
}

.error--shown { display: block; }

.honeypot {
  position: absolute;
  left: -9999px;
}

.btn-primary {
  background: var(--maroon);
  color: var(--paper);
  font-family: var(--face);
  font-size: var(--size-nav);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--track-nav);
  border: 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0 var(--space-3);
  height: var(--field-height);
  cursor: pointer;
  margin-top: var(--space-2);
  transition: background var(--hover) linear;
}

.btn-primary:hover { background: var(--ink); }

.thanks { font-size: var(--size-sentence); }

/* ---------- Mobile ---------- */

@media (max-width: 900px) {
  :root {
    --page-margin: 24px;
    --field-max-width: 100%;
    --field-max-height: 62vh;
  }

  .page {
    grid-template-columns: 1fr;
    row-gap: var(--space-6);
    padding: var(--space-3) var(--page-margin);
  }

  .mark--rail { width: 32px; height: 32px; }

  /* No hamburger. Six items is the whole site. */
  .nav {
    margin-top: var(--space-3);
    flex-direction: row;
    gap: var(--space-3);
    overflow-x: auto;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar { display: none; }
  .nav__item { font-size: 12px; white-space: nowrap; }
  .nav__item--contact { margin-top: 0; }

  .image-field, .chrome { width: 100%; }
  .image-field__advance--prev { width: 50%; }
  .image-field__advance--next { left: 50%; width: 50%; }

  .mark-page__lockup { left: var(--page-margin); top: 34vh; }
  .mark--full { width: 120px; height: 120px; }
  .wordmark { font-size: 26px; }
}