/* One centred rectangle on the page's paper. Sharp corners, one hairline.
   Inside: a way back, then the mail doors in the sheet's own small
   register — tracked caps, a wave under the word, air instead of a rule. */

* { box-sizing: border-box; }

html {
  background: var(--paper);
  color-scheme: light;
  caret-color: var(--word);
  scrollbar-color: var(--hair) var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: geometricPrecision;
  font-synthesis: none;
}

::selection {
  background: var(--word);
  color: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-6) var(--wp);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--geo);
  font-size: var(--f-cap);
  line-height: var(--lh-tight);
}

.board {
  width: min(100%, 20rem);
  padding: var(--sp-6);
  border: var(--rule) solid var(--hair);
  border-radius: 0;
  background: var(--paper);
}

.back {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  min-height: 1.875rem;
  padding: 0.5rem 0;
  margin: 0 0 var(--sp-2);
  color: var(--ink-3);
  text-decoration: none;
  font-size: var(--f-cap);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  line-height: 1;
  transition: color 120ms ease-out;
}

.mark {
  display: block;
  width: 1.15em;
  height: 1.15em;
  flex: none;
}

[dir="rtl"] .back .mark {
  scale: -1 1;
}

.back:hover,
.back:focus-visible {
  color: var(--word);
}

.back:focus-visible {
  outline: var(--rule) solid var(--ume);
  outline-offset: 3px;
}

/* Same index of doors as the sheet. No per-row rule, no numbers.
   Padding carries the reach; the two areas sit adjacent and never overlap. */
.ways {
  display: grid;
  width: 100%;
  margin: 0;
  padding: 0;
  font-size: var(--f-cap);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  line-height: 1;
}

.ways a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.45em;
  min-height: 1.875rem;
  padding: 0.5rem 0;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 120ms ease-out;
}

/* The sheet's own row is 30px. On a coarse pointer the same row has to
   clear 44px, so the height is raised only there — not drawn as empty
   bars on a mouse. */
@media (pointer: coarse) {
  .back,
  .ways a {
    min-height: 2.75rem;
  }
}

.ways a:hover,
.ways a:focus-visible {
  color: var(--word);
}

.ways a:focus-visible {
  outline: var(--rule) solid var(--ume);
  outline-offset: 3px;
}

.ways-k {
  position: relative;
  display: inline-block;
}

.ways-k::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0.18em;
  bottom: -0.6em;
  height: 5px;
  background-color: currentColor;
  opacity: 0.45;
  -webkit-mask-image: var(--wave);
  mask-image: var(--wave);
  -webkit-mask-repeat: repeat-x;
  mask-repeat: repeat-x;
  -webkit-mask-size: 36px 5px;
  mask-size: 36px 5px;
  transition: opacity 120ms ease-out;
}

.ways a:hover .ways-k::after,
.ways a:focus-visible .ways-k::after {
  opacity: 1;
}