:root {
  color-scheme: light;
  --ink: var(--color-ink);
  --muted: var(--color-muted);
  --paper: var(--color-canvas);
  --surface: var(--color-surface);
  --surface-raised: var(--color-surface-raised);
  --line: var(--color-border);
  --lime: var(--color-primary);
  --blue: var(--color-secondary);
  --coral: var(--color-attention);
  --board: color-mix(in srgb, var(--ink) 89%, var(--paper));
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

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

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--paper);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
}

button {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.home-link {
  position: fixed;
  z-index: 20;
  top: 18px;
  left: 18px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--surface-raised);
  box-shadow: 0 10px 25px color-mix(in srgb, var(--ink) 10%, transparent);
  font-size: 1.35rem;
  line-height: 1;
  text-decoration: none;
  transition: transform 160ms ease, color 160ms ease, border-color 160ms ease;
}

.home-link:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
  color: var(--blue);
}

.page-decoration {
  position: fixed;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
}

.page-decoration--lime {
  top: -210px;
  right: -120px;
  width: 390px;
  height: 390px;
  background: color-mix(in srgb, var(--lime) 64%, transparent);
}

.page-decoration--blue {
  bottom: -260px;
  left: -170px;
  width: 500px;
  height: 500px;
  background: var(--color-secondary-soft);
}

.game-shell {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 32px));
  min-height: 100svh;
  padding: 22px 0;
}

.game-topbar {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-left: 58px;
}

.game-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  text-decoration: none;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  grid-template-columns: repeat(2, 12px);
  grid-template-rows: repeat(2, 12px);
  place-content: center;
  gap: 2px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface-raised);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--ink) 8%, transparent);
}

.brand-mark i {
  display: grid;
  place-items: center;
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.46rem;
  font-style: normal;
  line-height: 1;
}

.brand-mark i:nth-child(2),
.brand-mark i:nth-child(3) {
  background: var(--coral);
  color: var(--ink);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.text-action,
.new-game-button,
.undo-button,
.primary-button,
.secondary-button,
.dialog-text-button,
.dialog-close,
.direction-pad button {
  border: 0;
}

.text-action,
.new-game-button {
  min-height: 44px;
  padding: 0 16px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 850;
}

.text-action {
  color: var(--ink);
  background: transparent;
}

.text-action:hover {
  color: var(--blue);
}

.new-game-button {
  color: var(--ink);
  background: var(--lime);
  box-shadow: 0 10px 20px color-mix(in srgb, var(--lime) 30%, transparent);
}

.new-game-button:hover,
.primary-button:hover {
  background: var(--color-primary-hover);
}

.game-layout {
  min-height: calc(100svh - 94px);
  padding: 20px 0 6px;
}

.intro-panel {
  padding-left: clamp(8px, 2vw, 28px);
}

.eyebrow,
.board-kicker,
.dialog-kicker {
  margin: 0;
  color: var(--coral);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.18em;
}

.intro-panel h1 {
  max-width: 470px;
  margin: 13px 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.55rem, 6.3vw, 5.65rem);
  font-weight: 500;
  line-height: 0.88;
  letter-spacing: -0.07em;
}

.intro-panel h1 em {
  color: var(--coral);
  font-weight: inherit;
}

.intro-lead {
  max-width: 450px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

.rules-list {
  max-width: 430px;
  display: grid;
  gap: 11px;
  margin: 28px 0 0;
}

.rules-list li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.rules-list li > span {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-raised);
  color: var(--blue);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
}

.rules-list p,
.rules-list strong,
.rules-list small {
  display: block;
  margin: 0;
}

.rules-list strong {
  font-size: 0.78rem;
}

.rules-list small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
}

.merge-example {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
}

.merge-example span {
  min-width: 50px;
  padding: 8px;
  border-radius: 10px;
  background: var(--surface-raised);
  box-shadow: 0 8px 18px color-mix(in srgb, var(--ink) 8%, transparent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.78rem;
  font-weight: 700;
  text-align: center;
}

.merge-example b {
  color: var(--muted);
  font-size: 0.72rem;
}

.merge-example .merge-example__goal {
  min-width: 64px;
  background: var(--ink);
  color: var(--lime);
}