:root {
  color-scheme: light;
  --ink: var(--color-ink);
  --ink-muted: var(--color-muted);
  --paper: var(--color-canvas);
  --surface: var(--color-surface);
  --surface-soft: var(--color-cell);
  --line: var(--color-border);
  --coral: var(--color-attention);
  --coral-dark: var(--color-attention-strong);
  --mint: var(--color-primary);
  --mint-dark: var(--color-secondary);
  --yellow: var(--color-primary);
  --shadow: var(--shadow-raised);
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 14px;
  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 {
  outline: 3px solid var(--color-secondary);
  outline-offset: 3px;
}

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

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

.home-link:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 3px;
}

.home-link svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

[hidden] {
  display: none !important;
}

.page-decoration {
  position: fixed;
  z-index: 0;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(1px);
  opacity: 0.75;
}

.page-decoration--one {
  top: -180px;
  right: -90px;
  background: var(--mint);
}

.page-decoration--two {
  bottom: -240px;
  left: -130px;
  width: 470px;
  height: 470px;
  background: var(--color-attention-soft);
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1080px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px 0;
  display: grid;
  place-items: center;
}

.start-screen {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 420px);
  align-items: center;
  gap: clamp(34px, 6vw, 68px);
}

.start-copy {
  padding: 12px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  justify-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--color-ink) 8%, transparent);
}

.mini-x,
.mini-o {
  position: relative;
  width: 12px;
  height: 12px;
}

.mini-x::before,
.mini-x::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  width: 13px;
  height: 2px;
  border-radius: 2px;
  background: var(--coral);
  transform: rotate(45deg);
}

.mini-x::after {
  transform: rotate(-45deg);
}

.mini-o {
  width: 13px;
  height: 13px;
  border: 2px solid var(--mint-dark);
  border-radius: 50%;
}

.eyebrow {
  margin: 46px 0 14px;
  color: var(--coral-dark);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.start-copy h1 {
  max-width: 570px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.2rem, 6.2vw, 5.5rem);
  font-weight: 500;
  line-height: 0.91;
  letter-spacing: -0.065em;
}

.start-copy h1 em {
  position: relative;
  display: inline-block;
  color: var(--coral);
  font-weight: inherit;
}

.start-copy h1 em::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  width: 78%;
  height: 9px;
  border-top: 3px solid currentColor;
  border-radius: 50%;
  transform: rotate(-2deg);
}

.start-lead {
  max-width: 570px;
  margin: 25px 0 0;
  color: var(--ink-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

.start-features {
  margin-top: 55px;
  display: flex;
  flex-wrap: wrap;
  gap: 15px 28px;
  color: var(--ink-muted);
  font-size: 0.77rem;
  font-weight: 750;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.start-features span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.start-features i {
  color: var(--coral);
  font-size: 0.64rem;
  font-style: normal;
}

.setup-card {
  padding: clamp(23px, 3vw, 32px);
  border: 1px solid color-mix(in srgb, var(--color-ink) 10%, transparent);
  border-radius: var(--radius-xl);
  background: color-mix(in srgb, var(--color-surface-raised) 94%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.setup-card__header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 17px;
  border-bottom: 1px solid var(--line);
}

.step-number {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex: none;
  border-radius: 50%;
  color: var(--surface);
  background: var(--ink);
  font-size: 1.25rem;
  font-weight: 800;
}

.setup-label,
.setup-hint {
  margin: 0;
}

.setup-label {
  font-size: 0.95rem;
  font-weight: 850;
}

.setup-hint {
  margin-top: 3px;
  color: var(--ink-muted);
  font-size: 0.82rem;
}

.size-picker {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 11px;
  margin-top: 8px;
}

.picker-label {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 18px 0 0;
  color: var(--ink-muted);
  font-size: 0.67rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.picker-label span {
  color: var(--coral);
  font-size: 0.85rem;
}

.size-option {
  min-height: 70px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.size-option:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary-hover);
}

.size-option.is-selected {
  border-color: var(--color-primary-hover);
  background: var(--color-primary-soft);
  box-shadow: inset 0 0 0 1px var(--color-primary-hover);
}

.size-option strong,
.size-option span {
  display: block;
}

.size-option strong {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 600;
}

.size-option span {
  margin-top: 3px;
  color: var(--ink-muted);
  font-size: 0.76rem;
}

.difficulty-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 8px;
}

.difficulty-option {
  min-width: 0;
  min-height: 62px;
  display: grid;
  place-items: center;
  gap: 5px;
  padding: 9px 5px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink-muted);
  background: transparent;
  cursor: pointer;
  font-size: 0.69rem;
  font-weight: 800;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

.difficulty-option:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary-hover);
}

.difficulty-option.is-selected {
  border-color: var(--color-primary-hover);
  color: var(--ink);
  background: var(--color-primary-soft);
  box-shadow: inset 0 0 0 1px var(--color-primary-hover);
}

.difficulty-bars {
  height: 18px;
  display: flex;
  align-items: end;
  gap: 3px;
}

.difficulty-bars i {
  display: block;
  width: 4px;
  border-radius: 4px;
  background: var(--line);
}

.difficulty-bars i:nth-child(1) { height: 7px; }
.difficulty-bars i:nth-child(2) { height: 12px; }
.difficulty-bars i:nth-child(3) { height: 18px; }
.difficulty-bars--easy i:nth-child(1),
.difficulty-bars--medium i:nth-child(-n + 2),
.difficulty-bars--expert i { background: var(--color-secondary); }

.rule-preview {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 15px 0;
  padding: 10px 13px;
  border-radius: var(--radius-md);
  background: var(--surface-soft);
}

.rule-preview__icon {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  flex: none;
  border-radius: 50%;
  color: var(--color-ink);
  background: var(--mint);
  font-weight: 900;
}

.rule-preview p,
.rule-preview span,
.rule-preview strong {
  margin: 0;
}

.rule-preview p > span,
.rule-preview strong {
  display: block;
}

.rule-preview p > span {
  color: var(--ink-muted);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.rule-preview strong {
  margin-top: 3px;
  font-size: 0.88rem;
}

.primary-button,
.secondary-button,
.quiet-button,
.text-button,
.icon-button {
  border: 0;
  cursor: pointer;
}

.button-icon {
  width: 20px;
  height: 20px;
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-button {
  width: 44px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  flex: none;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-ink);
  background: var(--color-surface);
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.icon-button:hover {
  transform: translateY(-1px);
  border-color: var(--color-secondary);
  color: var(--color-secondary);
  background: var(--color-secondary-soft);
}

.icon-button--danger:hover {
  border-color: var(--color-attention);
  color: var(--color-attention);
  background: var(--color-attention-soft);
}

.primary-button {
  width: 100%;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 11px 12px 11px 23px;
  border-radius: var(--radius-md);
  color: var(--color-ink);
  background: var(--color-primary);
  box-shadow: 0 13px 24px color-mix(in srgb, var(--color-primary) 28%, transparent);
  font-weight: 850;
  transition: background 160ms ease, transform 160ms ease;
}

.primary-button:hover {
  transform: translateY(-2px);
  background: var(--color-primary-hover);
}

.primary-button__arrow {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: var(--color-primary);
  background: var(--color-ink);
  font-size: 1.1rem;
}

.keyboard-tip {
  margin: 18px 0 0;
  color: var(--ink-muted);
  font-size: 0.7rem;
  text-align: center;
}

kbd {
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: white;
  font: inherit;
}

/* Game screen */