:root {
  color-scheme: dark;
  --bg: #07090b;
  --ink: #f4efe2;
  --muted: #a7b2ad;
  --line: #2a3432;
  --panel: #101719;
  --light: #dbc391;
  --dark: #506565;
  --accent: #6de0e5;
  --gold: #f1b64a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 32px 0;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  padding: 0 0 24px;
  border-bottom: 1px solid var(--line);
}

.eyebrow,
.label {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: .08em;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(36px, 8vw, 88px);
  line-height: .92;
  letter-spacing: 0;
}

.summary {
  max-width: 620px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 17px;
}

.status {
  min-width: 108px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  color: var(--gold);
  text-align: center;
  font-size: 13px;
  text-transform: uppercase;
}

.play {
  display: grid;
  grid-template-columns: minmax(320px, 620px) minmax(280px, 1fr);
  gap: 28px;
  align-items: start;
  padding-top: 28px;
}

.board-wrap {
  width: 100%;
}

.board {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border: 1px solid var(--line);
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  font-size: clamp(24px, 6.5vw, 58px);
  font-weight: 700;
}

.square.light {
  background: var(--light);
  color: #131619;
}

.square.dark {
  background: var(--dark);
  color: #f8f1dd;
}

.square.last::after {
  content: "";
  position: absolute;
  inset: 9%;
  border: 3px solid var(--gold);
  pointer-events: none;
}

.coord {
  position: absolute;
  left: 5px;
  bottom: 3px;
  color: rgba(7, 9, 11, .6);
  font-size: 11px;
  font-weight: 700;
}

.dark .coord {
  color: rgba(244, 239, 226, .64);
}

.files {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  padding-top: 8px;
}

.panel {
  display: grid;
  gap: 22px;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.facts {
  display: grid;
  gap: 12px;
  margin: 0;
}

.facts div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
  text-align: right;
}

#solution {
  display: grid;
  gap: 8px;
  min-height: 72px;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
}

#solution.revealed {
  color: var(--ink);
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button,
a {
  min-height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: #172124;
  color: var(--ink);
  text-decoration: none;
  font: inherit;
}

button {
  cursor: pointer;
}

@media (max-width: 820px) {
  .hero {
    display: block;
  }

  .status {
    display: inline-block;
    margin-top: 18px;
  }

  .play {
    grid-template-columns: 1fr;
  }
}