/* WordBrain reading desk
   paper #E4EBE6  ink #17211C  quiet #3E4C45  mist #D3DDD7
   known #146B42  learning #234E78  unknown #8B2340
   Literata (thesis, passage, slip word)
   Atkinson Hyperlegible (interface)
   Red Hat Mono (commands, labels) */

:root {
  --paper: #e4ebe6;
  --ink: #17211c;
  --quiet: #3e4c45;
  --mist: #d3ddd7;
  --known: #146b42;
  --learning: #234e78;
  --unknown: #8b2340;
  --measure: 40rem;
  --page: 68rem;
  --font-read: "Literata", "Iowan Old Style", Palatino, "Palatino Linotype", "Noto Sans SC", serif;
  --font-ui: "Atkinson Hyperlegible", "Noto Sans SC", "Segoe UI", sans-serif;
  --font-mono: "Red Hat Mono", ui-monospace, monospace;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1.05rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

::selection {
  background: #c5dbd0;
  color: var(--ink);
}

a {
  color: var(--ink);
  text-underline-offset: 0.16em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--known);
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 5;
  background: var(--ink);
  color: var(--paper);
  padding: 0.45rem 0.7rem;
  text-decoration: none;
}

.skip:focus {
  top: 1rem;
  outline: 2px solid var(--known);
  outline-offset: 3px;
}

.sheet {
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: clamp(1.15rem, 4vw, 2rem);
}

.kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--quiet);
}

h1,
h2,
.slip-word,
.brand,
.steps > li::before {
  font-family: var(--font-read);
  font-optical-sizing: auto;
}

h1 {
  margin: 0;
  font-style: italic;
  font-weight: 560;
  font-size: clamp(2.55rem, 6vw, 4.35rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

h2 {
  margin: 0;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(1.5rem, 2.4vw, 1.85rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h3 {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

.mast {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-top: 1.35rem;
  padding-bottom: 0.4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 650;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand svg {
  width: 1.7rem;
  height: 1.7rem;
  flex: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 1rem;
  padding-bottom: 0.35rem;
}

.nav a {
  text-decoration: none;
  font-size: 0.98rem;
}

.nav a:hover,
.nav a:focus-visible {
  text-decoration: underline;
}

.hero {
  padding-top: 2.4rem;
  padding-bottom: 0.5rem;
}

.dek {
  margin-top: 1.15rem;
  max-width: 38rem;
  font-size: 1.08rem;
  line-height: 1.5;
}

.hero-install {
  max-width: 36rem;
  margin-top: 1.6rem;
}

.hero-install .kicker {
  margin-bottom: 0.5rem;
}

.version {
  margin-top: 0.7rem;
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

.demo {
  margin-top: 2.6rem;
}

.passage {
  margin: 0;
  font-family: var(--font-read);
  font-weight: 560;
  font-size: clamp(1.7rem, 3.5vw, 2.7rem);
  line-height: 1.55;
  letter-spacing: -0.02em;
  font-optical-sizing: auto;
}

.word {
  position: relative;
  display: inline-block;
  vertical-align: baseline;
  margin: 0;
  padding: 0 0.01em 0.08em;
  border: 0;
  background: transparent;
  font: inherit;
  color: var(--ink);
  letter-spacing: inherit;
  cursor: pointer;
  border-radius: 2px;
}

.word[data-state="learning"] {
  color: var(--learning);
}

.word[data-state="unknown"] {
  color: var(--unknown);
}

.word .mark {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 0.07em;
  transform: scaleX(1);
  transform-origin: 0 50%;
  pointer-events: none;
}

.word[data-state="known"] .mark {
  height: 0.11em;
  background: var(--known);
}

.word[data-state="learning"] .mark {
  height: 0.08em;
  background: repeating-linear-gradient(
    90deg,
    var(--learning) 0 0.28em,
    transparent 0.28em 0.46em
  );
}

.word[data-state="unknown"] .mark {
  height: 0.12em;
  background: radial-gradient(circle, var(--unknown) 0.055em, transparent 0.065em) left center /
    0.36em 100% repeat-x;
}

.word:hover {
  background: color-mix(in srgb, var(--ink) 5%, transparent);
}

.word[aria-pressed="true"] {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
}

.word[data-state="learning"][aria-pressed="true"],
.word[data-state="learning"]:hover {
  background: color-mix(in srgb, var(--learning) 12%, transparent);
}

.word[data-state="unknown"][aria-pressed="true"],
.word[data-state="unknown"]:hover {
  background: color-mix(in srgb, var(--unknown) 12%, transparent);
}

.word:focus-visible {
  outline-offset: 2px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.25rem;
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.legend li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.swatch {
  width: 1.4rem;
  height: 0.42rem;
  display: inline-block;
}

.swatch.known {
  background: var(--known);
  height: 0.18rem;
}

.swatch.learning {
  background: repeating-linear-gradient(
    90deg,
    var(--learning) 0 0.32rem,
    transparent 0.32rem 0.52rem
  );
}

.swatch.unknown {
  background: radial-gradient(circle, var(--unknown) 1.5px, transparent 1.7px) left center / 0.42rem
    100% repeat-x;
}

.note {
  margin-top: 0.85rem;
  max-width: 40rem;
  color: var(--quiet);
  font-size: 0.92rem;
}

.slip {
  margin-top: 1.35rem;
  border-top: 3px solid var(--unknown);
  padding-top: 0.75rem;
}

.slip[data-state="known"] {
  border-top-color: var(--known);
}

.slip[data-state="learning"] {
  border-top-color: var(--learning);
}

.slip[data-state="unknown"] {
  border-top-color: var(--unknown);
}

.slip-word {
  margin: 0.35rem 0 0.3rem;
  font-style: italic;
  font-weight: 560;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.03em;
}

.slip-state {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.slip[data-state="known"] .slip-state {
  color: var(--known);
}

.slip[data-state="learning"] .slip-state {
  color: var(--learning);
}

.slip[data-state="unknown"] .slip-state {
  color: var(--unknown);
}

.slip-body {
  font-size: 0.95rem;
  line-height: 1.45;
}

.block {
  padding-top: 4.6rem;
}

.prose p,
.prose .paths,
.prose .steps,
.prose .command,
.prose h3 {
  max-width: var(--measure);
}

.prose > * + * {
  margin-top: 0.9rem;
}

.prose .kicker + h2 {
  margin-top: 0.4rem;
}

.prose code,
.paths code {
  font-family: var(--font-mono);
  font-size: 0.86em;
}

.paths {
  margin: 0.2rem 0 0;
  padding: 0;
  list-style: none;
}

.paths li + li {
  margin-top: 0.75rem;
}

.paths span {
  display: block;
  margin-bottom: 0.12rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--quiet);
}

.paths code {
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
  line-height: 1.4;
}

.network {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 0.4rem;
}

.network text {
  font-family: var(--font-ui);
  font-size: 14px;
  fill: var(--ink);
}

.command {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: 0.95rem 5.6rem 0.95rem 1rem;
}

.command pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.command button {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  border: 1px solid color-mix(in srgb, var(--paper) 55%, transparent);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.5rem;
  cursor: pointer;
}

.command button:hover {
  background: color-mix(in srgb, var(--paper) 12%, transparent);
}

.command button:focus-visible {
  outline-color: var(--paper);
}

.steps {
  margin: 0.4rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps > li {
  position: relative;
  counter-increment: step;
  padding-left: 2rem;
  margin-top: 2rem;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -0.15rem;
  font-style: italic;
  font-weight: 600;
  font-size: 1.45rem;
  line-height: 1;
}

.steps > li > * + * {
  margin-top: 0.75rem;
}

.downloads {
  margin: 0;
  padding: 0;
  list-style: none;
}

.downloads li {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr) auto;
  gap: 0.35rem 0.9rem;
  align-items: baseline;
  padding: 0.55rem 0;
}

.downloads .os {
  font-family: var(--font-read);
  font-style: italic;
  font-weight: 560;
  font-size: 1.15rem;
}

.downloads .meta {
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  overflow-wrap: anywhere;
}

.faq {
  margin-top: 1.35rem;
}

.faq h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

.faq p {
  margin-top: 0.35rem;
}

.faq + .faq {
  margin-top: 1.35rem;
}

.footer {
  padding-top: 4.2rem;
  padding-bottom: 3rem;
  color: var(--quiet);
  font-size: 0.95rem;
}

.footer p + p {
  margin-top: 0.4rem;
}

.footer a {
  color: var(--ink);
}

@media (prefers-reduced-motion: no-preference) {
  .word .mark {
    animation: draw 680ms cubic-bezier(0.16, 0.8, 0.24, 1) both;
    animation-delay: calc(var(--i) * 42ms);
  }
}

@keyframes draw {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

@media (min-width: 900px) {
  .demo {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 16.5rem;
    column-gap: 2.25rem;
    align-items: start;
  }

  .passage {
    grid-column: 1;
    grid-row: 1;
  }

  .legend {
    grid-column: 1;
    grid-row: 2;
  }

  .note {
    grid-column: 1;
    grid-row: 3;
  }

  .slip {
    grid-column: 2;
    grid-row: 1 / span 3;
    margin-top: 0.35rem;
  }
}

@media (max-width: 820px) {
  .nav {
    justify-content: flex-start;
    padding-bottom: 0;
  }

  .downloads li {
    grid-template-columns: 1fr;
    gap: 0.1rem;
    padding: 0.7rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}