/* XORIX — landing page */

:root {
  --ink: #000;
  --paper: #fff;

  --gap: clamp(1rem, 3vw, 2rem);
  --pad-band: clamp(3.5rem, 9vw, 7.5rem);
  --rule: 2px;
  --radius: 8px;

  --stack:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica,
    Arial, sans-serif;
}

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

::selection {
  background-color: #000000;
  color: #ffffff;
}

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

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--stack);
  font-weight: 500;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

.wrap {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
  text-align: center;
}

.lede,
.sub,
.body,
.caption,
.fineprint,
.foot .fineprint {
  margin-inline: auto;
}

/* ---------- typo ---------- */

.wordmark {
  font-size: clamp(4rem, 17vw, 11rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 0.82;
}

.lede {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  font-size: clamp(2.4rem, 4.6vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-wrap: balance;
}

.lede em {
  font-style: normal;
  color: white;
  background: black;
  border-radius: 8px;
  padding: 2px 20px;
}

.sub {
  margin-top: clamp(0.9rem, 2vw, 1.4rem);
  max-width: 46ch;
  font-size: clamp(2rem, 2.5vw, 2.15rem);
  font-weight: 500;
  opacity: 0.72;
}

.h2 {
  font-size: clamp(2.9rem, 6.4vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.033em;
  line-height: 1.02;
  text-wrap: balance;
}

.h3 {
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.body {
  margin-top: clamp(1rem, 2.4vw, 1.75rem);
  max-width: 58ch;
  font-size: clamp(2rem, 2.55vw, 2.2rem);
  font-weight: 600;
  line-height: 1.2;
}
.body--sm {
  font-size: clamp(1.45rem, 1.8vw, 1.55rem);
  max-width: 42ch;
}
.body em {
  font-style: italic;
}

.caption {
  margin-top: clamp(1rem, 2.4vw, 1.6rem);
  font-size: 1.2rem;
  opacity: 0.66;
  max-width: 55ch;
}

.fineprint {
  margin-top: 0.9rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #999;
  opacity: 0.55;
}

/* ---------- buttons ---------- */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.7em 1.5em;
  border: var(--rule) solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color 0.12s linear,
    color 0.12s linear,
    transform 0.08s ease;
}
.btn:hover {
  background: var(--ink);
  color: var(--paper);
}
.btn:active {
  transform: translateY(1px);
}
.btn--solid {
  background: var(--ink);
  color: var(--paper);
}
.btn--solid:hover {
  background: var(--paper);
  color: var(--ink);
}

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
}
.band--invert :focus-visible {
  outline-color: var(--ink);
}

/* ---------- sections ---------- */

.band {
  padding-block: var(--pad-band);
  border-top: var(--rule) solid var(--ink);
  background: var(--paper);
  color: var(--ink);
}

.band--invert {
  --ink: #fff;
  --paper: #000;
  background: var(--paper);
  color: var(--ink);
  border-top-color: #000;
}

/* ---------- hero ---------- */

.hero {
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding-block: clamp(3rem, 8vw, 6rem);
}

/* ---------- boards ---------- */

.board {
  display: grid;
  gap: var(--cell-gap, 6px);
  width: 100%;
  aspect-ratio: 1;
  border: var(--cell-gap, 6px) solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
}

.cell {
  border-radius: calc(var(--radius) - 4px);
  background: var(--paper);
  transition:
    background-color 0.16s linear,
    transform 0.09s ease;
}
.cell[data-on="1"] {
  background: var(--ink);
}
.cell[data-flip="1"] {
  animation: flip 0.34s ease;
}

@keyframes flip {
  0% {
    transform: scale(1);
  }
  45% {
    transform: scale(0.82);
  }
  100% {
    transform: scale(1);
  }
}

.board--sm {
  --cell-gap: 4px;
  width: clamp(88px, 24vw, 132px);
}
.board--md {
  --cell-gap: 5px;
  width: clamp(150px, 40vw, 220px);
  margin: 1.25rem auto 0;
}
.board--lg {
  --cell-gap: clamp(5px, 1.4vw, 9px);
  width: min(100%, 360px);
}

/* Miniature of the cell — no interaction, thinner lines */
.mini {
  display: grid;
  gap: 2px;
  margin-inline: auto;
  width: clamp(56px, 14vw, 74px);
  aspect-ratio: 1;
  border: 3px solid var(--ink);
  border-radius: 5px;
  background: var(--ink);
}
.mini i {
  border-radius: 1px;
  background: var(--paper);
}
.mini i[data-on="1"] {
  background: var(--ink);
}

.label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 0.4rem;
}

/* ---------- XOR equation ---------- */

.equation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(0.6rem, 2.4vw, 1.75rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
}
.eq__item {
  text-align: center;
}
.eq__item figcaption {
  margin-top: 0.7rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.4;
}
.eq__op {
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  font-weight: 700;
  opacity: 0.5;
  transform: translateY(-0.6em);
}

/* ---------- two columns ---------- */

.cols {
  display: grid;
  gap: clamp(2.25rem, 6vw, 4rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
}
@media (min-width: 760px) {
  .cols {
    grid-template-columns: 1fr 1fr;
  }
}
.col .body--sm {
  margin-top: 1.1rem;
}

/* ---------- solution animation ---------- */

.solve {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1rem, 2.6vw, 1.6rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
}
.solve__target {
  text-align: center;
}
.solve__target .mini {
  margin-inline: auto;
}

.dots {
  display: flex;
  gap: 12px;
}
.dots i {
  width: 12px;
  height: 12px;
  border: var(--rule) solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  transition: background-color 0.2s linear;
}
.dots i[data-on="1"] {
  background: var(--ink);
}

/* ---------- screenshots ---------- */

.shots {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
@media (min-width: 1000px) {
  .shots {
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(1rem, 2vw, 1.5rem);
  }
}
.shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 4px solid var(--ink);
  border-radius: 22px;
  filter: grayscale(1) contrast(1.06);
}
.shot figcaption {
  margin-top: 0.8rem;
  font-size: 1rem;
  line-height: 1.4;
  opacity: 0.62;
}

/* ---------- numbers ---------- */

.facts {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: clamp(2rem, 5vw, 3rem);
  list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

@media (min-width: 720px) {
  .facts {
    grid-template-columns: repeat(3, 1fr);
  }
}
.fact {
  padding-top: 0.85rem;
  padding-bottom: 0.5rem;
}
.fact strong {
  display: block;
  font-size: clamp(2.1rem, 6vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
}
.fact span {
  display: block;
  margin-top: 0.4rem;
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.35;
  opacity: 0.46;
}

/* ---------- footer ---------- */

.foot {
  padding-block: var(--pad-band);
  border-top: var(--rule) solid var(--ink);
}
.foot__credits {
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.015em;
}
.foot__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
  margin-top: 1.1rem;
}
.foot__links a {
  color: inherit;
  font-size: clamp(3.1rem, 5.4vw, 3.5rem);
  font-weight: 700;
  text-decoration: underline;
}
.foot__links a:hover {
  text-decoration-style: dotted;
}
.foot .fineprint {
  max-width: 48ch;
  margin-bottom: 4rem;
}

.foot img {
  display: block;
  height: 64px;
  margin-inline: auto;
  margin-top: 4rem;
}

.xor-cursor {
  position: fixed;
  top: 0;
  left: 0;
  width: 95px;
  height: 95px;
  margin: -47.5px 0 0 -47.5px;
  border-radius: 19px;
  background: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.25s linear;
  animation: xor-pulse 2.6s ease-in-out infinite;
  will-change: translate, scale;
}
.xor-cursor.is-on {
  opacity: 1;
}

@keyframes xor-pulse {
  0%,
  100% {
    scale: 1;
  }
  50% {
    scale: 1.12;
  }
}

html.has-xor-cursor,
html.has-xor-cursor * {
  cursor: none;
}

@media (hover: none), (prefers-reduced-motion: reduce) {
  .xor-cursor {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
}