:root {
  color-scheme: light;
  --color-bg: #f8f5ef;
  --color-surface: #ffffff;
  --color-surface-muted: #f1ede5;
  --color-text: #111827;
  --color-muted: #5b6472;
  --color-border: #ded8cf;
  --color-accent: #0f766e;
  --color-accent-dark: #115e59;
  --color-danger: #b91c1c;
  --shadow-soft: 0 1rem 2.5rem rgb(17 24 39 / 0.08);
  --radius-lg: 1.5rem;
  --radius-md: 0.875rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--color-text);
  background:
    radial-gradient(circle at top left, rgb(15 118 110 / 0.12), transparent 28rem),
    var(--color-bg);
}

button {
  font: inherit;
}

.app {
  display: grid;
  gap: 1.25rem;
  width: min(72rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0;
}

.hero,
.game,
.panel {
  padding: 1.25rem;
  background: rgb(255 255 255 / 0.84);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--color-accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 14ch;
  margin-bottom: 0.75rem;
  font-size: clamp(2.25rem, 9vw, 4.25rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.35rem, 4vw, 2rem);
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.hero__lead {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.game__header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.button {
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  color: #ffffff;
  background: var(--color-accent);
  border: 0;
  border-radius: 999px;
  cursor: pointer;
}

.button:hover {
  background: var(--color-accent-dark);
}

.button:focus-visible,
.game-setting select:focus-visible,
.cell:focus-visible {
  outline: 3px solid rgb(15 118 110 / 0.35);
  outline-offset: 3px;
}

.status {
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  color: var(--color-muted);
  background: var(--color-surface-muted);
  border-radius: var(--radius-md);
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--board-width), minmax(2rem, 1fr));
  gap: 0.35rem;
  overflow-x: auto;
}

.cell {
  aspect-ratio: 1;
  min-width: 0;
  color: var(--color-text);
  font-weight: 750;
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-radius: 0.55rem;
  cursor: pointer;
}

.cell:hover {
  border-color: var(--color-accent);
}

.cell[data-state="revealed"] {
  background: var(--color-surface);
  cursor: default;
}

.cell[data-state="mine"] {
  color: #ffffff;
  background: var(--color-danger);
}

.facts {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 1.25rem;
}

.fact {
  padding: 0.9rem;
  background: var(--color-surface-muted);
  border-radius: var(--radius-md);
}

dt {
  margin-bottom: 0.35rem;
  color: var(--color-muted);
  font-size: 0.85rem;
  font-weight: 700;
}

dd {
  margin: 0;
}

.trace {
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.trace ol {
  padding-left: 1.25rem;
  margin: 0;
  color: var(--color-muted);
  line-height: 1.6;
}

@media (min-width: 52rem) {
  .app {
    grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
    align-items: start;
    padding: 3rem 0;
  }

  .hero {
    grid-column: 1 / -1;
  }

  .panel {
    position: sticky;
    top: 1rem;
  }
}
.cell[data-state="flagged"] {
  color: var(--color-accent-dark);
  background: rgb(15 118 110 / 0.12);
  border-color: var(--color-accent);
}

.game__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: end;
  justify-content: flex-end;
}

.game-setting {
  display: grid;
  gap: 0.25rem;
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.game-setting select {
  min-height: 2.75rem;
  padding: 0.65rem 2rem 0.65rem 0.75rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.65rem;
  cursor: pointer;
}