:root {
  --bg: #f4f8fc;
  --bg-accent: #dcecff;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --line: #cfdceb;
  --line-strong: #8ca9c9;
  --text: #18324d;
  --text-soft: #5d738a;
  --accent: #2f7de1;
  --accent-strong: #1f63bf;
  --accent-soft: #e4f0ff;
  --peer: #f2f7ff;
  --match: #d9ebff;
  --conflict: #ffe8eb;
  --conflict-text: #c14861;
  --shadow: 0 18px 48px rgba(30, 71, 118, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --site-width: 1180px;
  --content-width: 840px;
  --button-bg: #fbfdff;
  --pill-bg: #f7fbff;
  --cell-bg: #ffffff;
  --muted-note: #6d87a3;
  --given: #0f2e54;
  --selected-match: #cfe4ff;
  --success-shadow: rgba(30, 71, 118, 0.08);
  --selected-outline: rgba(47, 125, 225, 0.44);
  --highlight-line: rgba(120, 160, 220, 0.08);
  --highlight-block: rgba(120, 160, 220, 0.06);
  --focus-dim: 0.46;
}

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

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  margin: 0;
  font-family: "SF Pro Text", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(107, 165, 238, 0.22), transparent 28%),
    radial-gradient(circle at right 12%, rgba(194, 226, 255, 0.35), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, #eef4fb 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("/assets/patterns/sudoku-pattern.svg");
  background-repeat: repeat;
  background-size: 240px 240px;
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}

body > * {
  position: relative;
  z-index: 1;
}

body.app-page {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  overscroll-behavior: none;
}

body.theme-dark {
  --bg: #0f1825;
  --bg-accent: #1d3149;
  --surface: rgba(20, 29, 43, 0.94);
  --surface-strong: #182434;
  --line: #31465f;
  --line-strong: #5c7ca0;
  --text: #e6eef7;
  --text-soft: #a8b9cb;
  --accent: #6daaf5;
  --accent-strong: #9bc7ff;
  --accent-soft: rgba(109, 170, 245, 0.18);
  --peer: #1f3248;
  --match: #27496a;
  --conflict: rgba(142, 54, 76, 0.42);
  --conflict-text: #ffb9c5;
  --button-bg: #1a2636;
  --pill-bg: #172332;
  --cell-bg: #132131;
  --muted-note: #89a2bd;
  --given: #eaf2ff;
  --selected-match: #32577d;
  --success-shadow: rgba(3, 8, 15, 0.35);
  --selected-outline: rgba(109, 170, 245, 0.54);
  --highlight-line: rgba(109, 170, 245, 0.14);
  --highlight-block: rgba(109, 170, 245, 0.1);
  --focus-dim: 0.42;
}

body.theme-dark::before {
  background-image: url("/assets/patterns/sudoku-pattern-dark.svg");
  opacity: 0.57;
}

body.kids-theme {
  background:
    radial-gradient(circle at top left, rgba(255, 174, 186, 0.2), transparent 28%),
    radial-gradient(circle at right 10%, rgba(255, 222, 184, 0.24), transparent 30%),
    linear-gradient(180deg, #fff9fb 0%, #f7fbff 100%);
}

body.kids-theme::before {
  background-image: url("/assets/patterns/sudoku-pattern-kids.svg");
  opacity: 0.62;
}

body.kids-theme.theme-dark::before {
  background-image: url("/assets/patterns/sudoku-pattern-kids-dark.svg");
  opacity: 0.66;
}

body.mode-warm {
  --bg: #26221c;
  --bg-accent: #3a332a;
  --surface: rgba(37, 32, 27, 0.96);
  --surface-strong: #312a22;
  --line: #4b4438;
  --line-strong: #8b7b63;
  --text: #f3ebde;
  --text-soft: #ddd0be;
  --accent: #e8c78a;
  --accent-strong: #f2d7a2;
  --accent-soft: rgba(232, 199, 138, 0.16);
  --peer: rgba(123, 109, 91, 0.18);
  --match: rgba(232, 199, 138, 0.15);
  --conflict: rgba(142, 78, 54, 0.34);
  --conflict-text: #ffd8c1;
  --button-bg: #342d25;
  --pill-bg: #2d261f;
  --cell-bg: #2b251f;
  --muted-note: #bcae98;
  --given: #fff4e2;
  --selected-match: rgba(232, 199, 138, 0.24);
  --success-shadow: rgba(8, 6, 4, 0.34);
  --selected-outline: rgba(232, 199, 138, 0.58);
  --highlight-line: rgba(232, 199, 138, 0.12);
  --highlight-block: rgba(232, 199, 138, 0.09);
  --focus-dim: 0.42;
  background:
    radial-gradient(circle at top left, rgba(112, 86, 56, 0.24), transparent 28%),
    radial-gradient(circle at right 12%, rgba(232, 199, 138, 0.09), transparent 30%),
    linear-gradient(180deg, #2a241d 0%, #1f1a15 100%);
}

body.mode-warm::before {
  background-image: url("/assets/patterns/sudoku-pattern-dark.svg");
  opacity: 0.48;
}

body.kids-theme.mode-warm::before {
  background-image: url("/assets/patterns/sudoku-pattern-kids-dark.svg");
  opacity: 0.56;
}

body.mode-dyslexia,
body.mode-dyslexia button,
body.mode-dyslexia input,
body.mode-dyslexia textarea,
body.mode-dyslexia select {
  font-family: "Atkinson Hyperlegible", "Lexend", "Trebuchet MS", "Segoe UI", Arial, sans-serif;
}

body.mode-dyslexia {
  letter-spacing: 0.04em;
  line-height: 1.6;
  font-size: 1.04rem;
}

body.mode-dyslexia .site-nav a,
body.mode-dyslexia .action-button,
body.mode-dyslexia .number-button,
body.mode-dyslexia .cta-button,
body.mode-dyslexia .kids-button,
body.mode-dyslexia .setting-chip,
body.mode-dyslexia .difficulty-tabs button {
  padding-inline: 16px;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
}

.skip-link:focus {
  top: 16px;
}

.site-shell {
  width: min(calc(100% - 32px), var(--site-width));
  margin: 0 auto;
}

.site-header {
  padding: 18px 0 12px;
}

.app-page .site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 24;
  transition: opacity 0.24s ease, transform 0.24s ease;
}

.app-page[data-active-screen="content"] .site-header {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-18px);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  border: 1px solid rgba(140, 169, 201, 0.32);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px);
  box-shadow: 0 12px 30px rgba(21, 58, 92, 0.05);
}

body.theme-dark .site-header__bar {
  background: rgba(17, 28, 41, 0.82);
  box-shadow: 0 12px 30px rgba(2, 8, 16, 0.24);
}

body.theme-dark .site-nav__toggle {
  background: rgba(20, 29, 43, 0.94);
  border-color: rgba(108, 145, 188, 0.34);
}

body.theme-dark .a11y-modes__toggle,
body.theme-dark .a11y-mode-button {
  background: rgba(20, 29, 43, 0.94);
  border-color: rgba(108, 145, 188, 0.34);
  color: var(--text-soft);
  box-shadow: 0 10px 24px rgba(2, 8, 16, 0.18);
}

body.theme-dark .a11y-mode-help {
  background: rgba(20, 29, 43, 0.94);
  border-color: rgba(108, 145, 188, 0.34);
  color: var(--text-soft);
}

body.theme-dark .a11y-mode-button:hover,
body.theme-dark .a11y-mode-button:focus-visible,
body.theme-dark .a11y-mode-button.is-active,
body.theme-dark .a11y-modes__toggle:hover,
body.theme-dark .a11y-modes__toggle:focus-visible {
  background: rgba(109, 170, 245, 0.18);
  border-color: rgba(109, 170, 245, 0.38);
  color: var(--accent-strong);
}

body.theme-dark .a11y-modes__toggle-dot {
  background: #8fc0ff;
  box-shadow: 0 0 0 3px rgba(143, 192, 255, 0.14);
}

body.mode-warm .site-header__bar,
body.mode-warm .site-nav__toggle,
body.mode-warm .a11y-modes__toggle,
body.mode-warm .a11y-mode-button {
  background: rgba(37, 32, 27, 0.96);
  border-color: rgba(139, 123, 99, 0.34);
  color: var(--text);
  box-shadow: 0 10px 24px rgba(10, 7, 4, 0.18);
}

body.mode-warm .a11y-mode-help {
  background: rgba(37, 32, 27, 0.96);
  border-color: rgba(139, 123, 99, 0.34);
  color: var(--text-soft);
}

body.mode-warm .a11y-mode-button:hover,
body.mode-warm .a11y-mode-button:focus-visible,
body.mode-warm .a11y-mode-button.is-active,
body.mode-warm .a11y-modes__toggle:hover,
body.mode-warm .a11y-modes__toggle:focus-visible {
  background: rgba(232, 199, 138, 0.16);
  border-color: rgba(232, 199, 138, 0.34);
  color: var(--accent-strong);
}

body.mode-warm .a11y-modes__toggle-dot {
  background: #e8c78a;
  box-shadow: 0 0 0 3px rgba(232, 199, 138, 0.16);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  min-width: 0;
}

body.theme-dark .brand,
body.mode-warm .brand {
  padding: 6px 10px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.08);
}

body.theme-dark .brand {
  background: rgba(234, 243, 255, 0.12);
  box-shadow: inset 0 0 0 1px rgba(109, 170, 245, 0.18);
}

body.mode-warm .brand {
  background: rgba(248, 236, 220, 0.16);
  box-shadow: inset 0 0 0 1px rgba(232, 199, 138, 0.2);
}

.brand__logo {
  display: block;
  width: auto;
  height: 42px;
  max-width: min(220px, 48vw);
}

body.theme-dark .brand__logo {
  filter: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.site-header__tools {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex: 0 0 auto;
}

.a11y-modes {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.a11y-modes__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  min-height: 40px;
  padding: 0;
  border: 1px solid rgba(140, 169, 201, 0.3);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-soft);
  box-shadow: 0 10px 24px rgba(21, 58, 92, 0.06);
  transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.a11y-modes__toggle:hover,
.a11y-modes__toggle:focus-visible,
.a11y-modes.is-open .a11y-modes__toggle {
  transform: translateY(-1px);
  border-color: rgba(47, 125, 225, 0.34);
  background: rgba(120, 160, 220, 0.12);
  color: var(--accent-strong);
}

.a11y-modes__toggle-glyph {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

.a11y-modes__toggle-glyph svg {
  width: 20px;
  height: 20px;
  transition: transform 0.18s ease;
}

.a11y-modes__toggle-dot {
  position: absolute;
  top: -3px;
  right: -5px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #6daaf5;
  box-shadow: 0 0 0 3px rgba(109, 170, 245, 0.14);
  transition: transform 0.18s ease, opacity 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.a11y-modes.is-open .a11y-modes__toggle-glyph svg {
  transform: scale(1.02);
}

.a11y-modes.is-open .a11y-modes__toggle-dot {
  transform: scale(0.92);
}

.a11y-modes__toggle-label {
  display: none;
}

.a11y-modes__list {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: none;
  width: min(260px, calc(100vw - 32px));
  padding: 8px;
  border: 1px solid rgba(140, 169, 201, 0.22);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 28px rgba(21, 58, 92, 0.08);
  z-index: 26;
}

.a11y-modes.is-open .a11y-modes__list {
  display: grid;
  gap: 8px;
}

.a11y-mode-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: stretch;
  gap: 8px;
}

.a11y-mode-item--theme {
  grid-template-columns: minmax(0, 1fr);
}

.a11y-mode-button {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  height: auto;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid rgba(140, 169, 201, 0.3);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-soft);
  box-shadow: none;
  transition: transform 0.16s ease, background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.a11y-mode-button:hover,
.a11y-mode-button:focus-visible,
.a11y-mode-button.is-active {
  transform: translateY(-1px);
  border-color: rgba(47, 125, 225, 0.34);
  background: rgba(120, 160, 220, 0.15);
  color: var(--accent-strong);
}

.a11y-mode-button__icon {
  display: inline-flex;
  width: 18px;
  height: 18px;
}

.a11y-mode-button__icon svg {
  width: 100%;
  height: 100%;
}

.a11y-mode-button__label {
  display: inline;
  font-size: 0.88rem;
  font-weight: 600;
}

.a11y-mode-button__meta {
  margin-left: auto;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.78;
}

.a11y-mode-button__icon--theme {
  width: 22px;
  height: 22px;
}

.theme-glyph {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.92rem;
  line-height: 1;
}

.theme-glyph__sun {
  color: #e4a11b;
}

.theme-glyph__moon {
  color: #6b8fca;
}

.a11y-mode-help {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: auto;
  min-height: 44px;
  border-radius: 14px;
  border: 1px solid rgba(140, 169, 201, 0.26);
  background: rgba(255, 255, 255, 0.72);
  color: var(--text-soft);
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.78;
  transition: opacity 0.16s ease, color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.a11y-mode-help:hover,
.a11y-mode-help:focus-visible {
  opacity: 1;
  color: var(--accent-strong);
  border-color: rgba(47, 125, 225, 0.32);
  background: rgba(120, 160, 220, 0.12);
}

.site-nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  padding: 0;
  border: 1px solid rgba(140, 169, 201, 0.32);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--accent-strong);
  box-shadow: 0 10px 24px rgba(21, 58, 92, 0.06);
}

.site-nav__toggle-glyph {
  position: relative;
  display: grid;
  gap: 4px;
  width: 22px;
  height: 22px;
}

.site-nav__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 0.18s ease, opacity 0.18s ease, width 0.18s ease;
}

.site-nav__toggle-dot {
  display: none;
}

.site-header__bar.is-nav-open .site-nav__toggle-line:nth-child(1) {
  width: 22px;
  transform: none;
}

.site-header__bar.is-nav-open .site-nav__toggle-line:nth-child(2) {
  opacity: 1;
}

.site-header__bar.is-nav-open .site-nav__toggle-line:nth-child(3) {
  width: 16px;
  transform: none;
}

.a11y-modes--visual .a11y-modes__toggle {
  color: var(--accent-strong);
}

.a11y-modes--visual .a11y-modes__toggle:hover,
.a11y-modes--visual .a11y-modes__toggle:focus-visible,
.a11y-modes--visual.is-open .a11y-modes__toggle {
  background: rgba(120, 160, 220, 0.08);
}

.a11y-modes--visual .a11y-modes__toggle-dot {
  top: -2px;
  right: -4px;
  width: 6px;
  height: 6px;
}

.a11y-modes--visual.is-open .a11y-modes__toggle-dot {
  transform: scale(1);
}

.site-nav a {
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--text-soft);
  transition: background-color 0.18s ease, color 0.18s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.is-current {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.hero {
  padding: 18px 0 24px;
}

.page-shell {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.page-track {
  height: 200vh;
  height: 200dvh;
  transition: transform 0.4s ease;
  will-change: transform;
}

.page-screen {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.screen-game {
  position: relative;
  padding: 102px 0 20px;
}

.screen-game .site-shell {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 100%;
  padding-bottom: 86px;
}

.screen-game .hero {
  padding: 0;
}

.screen-game .hero__layout {
  grid-template-columns: 1fr;
  gap: 10px;
  align-content: start;
}

.screen-game .hero h1 {
  margin-top: 6px;
  margin-bottom: 6px;
  font-size: clamp(1.7rem, 3.8vw, 2.8rem);
}

.screen-game .hero__lede {
  max-width: 640px;
  font-size: 0.96rem;
  line-height: 1.55;
}

.screen-game .hero__summary {
  display: grid;
  gap: 4px;
}

.hero__layout {
  display: grid;
  gap: 18px;
}

.hero__summary {
  max-width: 780px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(47, 125, 225, 0.08);
  color: var(--accent-strong);
  font-size: 0.88rem;
  font-weight: 600;
}

body.theme-dark .eyebrow,
body.mode-warm .eyebrow {
  background: rgba(109, 170, 245, 0.14);
  color: var(--accent-strong);
}

.hero h1,
.page-hero h1 {
  margin: 14px 0 10px;
  font-size: clamp(2.1rem, 5vw, 3.7rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
}

.hero__lede,
.page-hero__lede,
.section-intro,
.page-copy p,
.faq__item p,
.policy-copy p,
.policy-copy li,
.error-card p {
  color: var(--text-soft);
  line-height: 1.68;
}

.hero__lede,
.page-hero__lede {
  margin: 0;
  max-width: 720px;
  font-size: 1.02rem;
}

.hero__playfield {
  display: grid;
  gap: 18px;
}

.hero__playfield .app-card {
  width: min(100%, 1060px);
  margin: 0 auto;
}

.screen-game__cta {
  position: absolute;
  right: 0;
  bottom: 18px;
  left: 0;
  display: flex;
  justify-content: center;
  width: min(calc(100% - 32px), var(--site-width));
  margin: 0 auto;
  padding: 0;
  z-index: 6;
  pointer-events: none;
}

.screen-game__cta .screen-toggle {
  pointer-events: auto;
}

.screen-game__cta--floating .screen-toggle {
  min-height: 46px;
  padding: 10px 16px;
  border-radius: 18px;
  box-shadow: none;
}

.screen-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  min-width: 304px;
  min-height: 60px;
  padding: 12px 16px;
  border: 1px solid rgba(140, 169, 201, 0.32);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--accent-strong);
  font-weight: 700;
  box-shadow: 0 10px 28px var(--success-shadow);
  transition: transform 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.screen-toggle__icon {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border-radius: 999px;
  background: rgba(47, 125, 225, 0.1);
  color: var(--accent-strong);
  font-size: 1.05rem;
  line-height: 1;
}

.screen-toggle__copy {
  display: grid;
  gap: 2px;
  text-align: left;
}

.screen-toggle__title {
  color: var(--accent-strong);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.2;
}

.screen-toggle__meta {
  color: var(--text-soft);
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1.25;
}

.screen-toggle:hover,
.screen-toggle:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(47, 125, 225, 0.4);
  background: #f8fbff;
}

.app-card {
  padding: 20px;
  border: 1px solid rgba(140, 169, 201, 0.26);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.screen-game .app-card {
  padding: 16px 16px 14px;
}

.app-card__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.screen-game .app-card__top {
  margin-bottom: 12px;
}

.app-card__title {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 1.95rem);
  letter-spacing: -0.03em;
}

.app-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.meta-pill,
.timer,
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--pill-bg);
  border: 1px solid rgba(140, 169, 201, 0.28);
  color: var(--text-soft);
  font-size: 0.95rem;
}

.meta-pill strong,
.timer strong {
  color: var(--text);
}

.timer strong {
  font-variant-numeric: tabular-nums;
}

.meta-pill--id strong {
  letter-spacing: 0.02em;
}

.is-hidden {
  display: none !important;
}

.difficulty-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.screen-game .difficulty-tabs {
  gap: 8px;
}

.difficulty-tabs button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(140, 169, 201, 0.3);
  background: var(--button-bg);
  color: var(--text-soft);
  text-align: center;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.difficulty-tabs button:hover,
.difficulty-tabs button:focus-visible,
.difficulty-tabs button.is-current {
  border-color: rgba(47, 125, 225, 0.38);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.play-area {
  display: grid;
  gap: 18px;
}

.screen-game .play-area,
.screen-game .board-panel {
  gap: 12px;
}

.board-panel {
  display: grid;
  gap: 16px;
}

.board-wrap {
  width: min(100%, 620px);
  margin: 0 auto;
  padding: 12px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 14px 34px rgba(19, 43, 71, 0.08);
}

.screen-game .board-wrap {
  width: min(100%, 41vh, 520px);
}

.board {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  width: 100%;
  aspect-ratio: 1;
  border: 2px solid var(--line-strong);
  border-radius: 0;
  overflow: hidden;
  background: var(--cell-bg);
  box-shadow: inset 0 0 0 1px rgba(207, 220, 235, 0.3);
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0;
  background: var(--cell-bg);
  color: var(--text);
  transition: background-color 0.14s ease, color 0.14s ease, box-shadow 0.14s ease;
}

.cell::after {
  content: "";
  position: absolute;
  inset: 2px;
  border: 0 solid transparent;
  border-radius: 6px;
  pointer-events: none;
  transition: border-color 0.14s ease;
}

.cell--col-divider {
  border-right-width: 2px;
  border-right-color: var(--line-strong);
}

.cell--row-divider {
  border-bottom-width: 2px;
  border-bottom-color: var(--line-strong);
}

.cell:nth-child(9n) {
  border-right: 0;
}

.cell:nth-last-child(-n + 9) {
  border-bottom: 0;
}

.cell__value {
  font-size: clamp(1.1rem, 2.9vw, 1.75rem);
  font-weight: 600;
}

body.mode-dyslexia .cell__value {
  font-size: clamp(1.2rem, 3.1vw, 1.95rem);
}

.cell__notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  width: 82%;
  height: 82%;
  color: var(--muted-note);
  font-size: clamp(0.5rem, 1.4vw, 0.76rem);
  align-content: center;
}

.cell__notes span {
  display: grid;
  place-items: center;
}

.cell--given {
  color: var(--given);
}

.cell--editable .cell__value {
  color: var(--accent-strong);
}

.cell--selected {
  background: var(--accent-soft);
}

.cell--selected::after {
  border-width: 2px;
  border-color: var(--selected-outline);
}

.cell--matching {
  background: var(--match);
}

.cell--selected.cell--matching {
  background: var(--selected-match);
}

.cell--conflict {
  background: var(--conflict);
  color: var(--conflict-text);
}

.cell--mistake {
  background: rgba(255, 213, 220, 0.72);
  color: #b83f57;
}

.cell--rejected {
  animation: cell-reject 0.34s ease;
  box-shadow: inset 0 0 0 2px rgba(193, 72, 97, 0.58);
}

body.mode-row-highlight .cell--line-peer {
  background: var(--highlight-line);
}

body.mode-focus .board .cell {
  opacity: var(--focus-dim);
}

body.mode-focus .cell--focus-block,
body.mode-focus .cell--selected {
  opacity: 1;
}

@keyframes cell-reject {
  0% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-2px);
  }
  50% {
    transform: translateX(2px);
  }
  75% {
    transform: translateX(-2px);
  }
  100% {
    transform: translateX(0);
  }
}

.cell:focus-visible,
.action-button:focus-visible,
.number-button:focus-visible,
.difficulty-tabs button:focus-visible,
.site-nav a:focus-visible,
.footer-nav a:focus-visible,
.link-card:focus-visible,
.cta-button:focus-visible,
.screen-toggle:focus-visible {
  outline: 3px solid rgba(47, 125, 225, 0.28);
  outline-offset: 2px;
}

.app-controls,
.number-pad {
  display: grid;
  gap: 10px;
}

.app-controls {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.action-button,
.number-button,
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 12px 14px;
  border: 1px solid rgba(140, 169, 201, 0.3);
  border-radius: 18px;
  background: var(--button-bg);
  color: var(--text);
  font-weight: 600;
  transition: transform 0.16s ease, background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.action-button--compact {
  min-height: 40px;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.92rem;
}

.button-with-icon {
  gap: 6px;
}

.button-icon {
  display: inline-flex;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
}

.button-icon svg {
  width: 100%;
  height: 100%;
}

.button-label {
  display: inline-block;
}

.action-button:hover,
.action-button:focus-visible,
.number-button:hover,
.number-button:focus-visible,
.cta-button:hover,
.cta-button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(47, 125, 225, 0.32);
  background: var(--accent-soft);
}

.action-button:hover .button-icon,
.action-button:focus-visible .button-icon,
.cta-button:hover .button-icon,
.cta-button:focus-visible .button-icon,
.kids-button:hover .button-icon,
.kids-button:focus-visible .button-icon {
  color: var(--accent-strong);
}

.action-button.is-active {
  border-color: rgba(47, 125, 225, 0.52);
  background: #edf5ff;
  color: var(--accent-strong);
}

.cta-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
  border-color: rgba(140, 169, 201, 0.3);
  background: #f6f9fc;
  color: var(--text-soft);
}

.number-pad {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.number-button {
  min-height: 58px;
  font-size: 1.15rem;
}

.helper-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid rgba(140, 169, 201, 0.26);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.74);
}

.helper-card__title {
  margin: 0;
  font-size: 1rem;
}

.helper-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-soft);
  line-height: 1.65;
}

.helper-card p {
  margin: 0;
}

.game-settings {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 10px;
}

.game-utility {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
}

.game-utility .meta-pill,
.game-utility .action-button--compact {
  min-height: 38px;
}

.setting-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid rgba(140, 169, 201, 0.3);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--text-soft);
  font-size: 0.92rem;
  font-weight: 600;
  transition: border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}

.setting-chip:hover,
.setting-chip:focus-visible,
.setting-chip.is-active {
  transform: translateY(-1px);
  border-color: rgba(47, 125, 225, 0.36);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.app-card__lead {
  margin: 0 0 18px;
  max-width: 64ch;
  color: var(--text-soft);
  line-height: 1.65;
}

.screen-game .app-card__lead {
  margin-bottom: 10px;
}

.status-line {
  min-height: 24px;
  margin: 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.screen-game .status-line {
  min-height: 20px;
  font-size: 0.91rem;
}

.screen-game .hero__summary {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.screen-game .site-shell {
  gap: 0;
  padding-bottom: 24px;
}

.screen-game .hero__layout,
.screen-game .hero__playfield {
  gap: 0;
}

.screen-game .kids-shell {
  padding-bottom: 84px;
}

.screen-game .hero__playfield .app-card {
  width: min(100%, 1180px);
}

.screen-game .app-card {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.screen-game .app-card__top,
.screen-game .app-card__lead,
.screen-game .game-utility {
  display: none !important;
}

.screen-game .difficulty-tabs {
  width: min(100%, 520px);
  margin: 0 auto 16px;
}

.screen-game .play-area {
  grid-template-columns: minmax(180px, 220px) minmax(360px, 560px) minmax(190px, 240px);
  grid-template-areas: "left center right";
  justify-content: center;
  align-items: start;
  gap: 24px;
}

.screen-game .board-panel {
  grid-area: center;
  justify-items: center;
  width: 100%;
  gap: 14px;
}

.screen-game .board-wrap {
  width: min(100%, 56vh, 540px);
}

.screen-game .number-pad {
  width: min(100%, 540px);
  grid-template-columns: repeat(9, minmax(0, 1fr));
}

.screen-game .number-button {
  min-height: 56px;
  border-radius: 16px;
}

.game-sidebar {
  display: grid;
  gap: 14px;
}

.game-sidebar--left {
  grid-area: left;
}

.game-sidebar--right {
  grid-area: right;
}

.game-sidebar__group {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.68);
}

.game-sidebar__group--top {
  gap: 14px;
}

.game-sidebar--left .action-button,
.game-sidebar--left .setting-chip {
  width: 100%;
}

.game-sidebar--left .action-button {
  justify-content: flex-start;
}

.game-sidebar--left .game-settings {
  display: grid;
  gap: 10px;
  margin: 0;
}

.game-sidebar--left .setting-chip {
  justify-content: flex-start;
}

.game-sidebar--right .action-button--compact,
.game-sidebar--right .screen-toggle {
  width: 100%;
}

.game-sidebar--right .screen-toggle {
  min-height: 48px;
  padding: 10px 14px;
  border-radius: 18px;
  box-shadow: none;
  background: var(--button-bg);
}

.game-hud-heading {
  display: grid;
  gap: 6px;
}

.game-hud-heading__eyebrow {
  color: var(--text-soft);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.game-hud-heading__title {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.game-hud {
  display: grid;
  gap: 10px;
}

.mobile-game-panel {
  display: none;
  position: relative;
  z-index: 3;
}

.mobile-game-panel[open] {
  padding: 7px 9px 9px;
  border: 1px solid rgba(140, 169, 201, 0.22);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 16px 34px rgba(21, 58, 92, 0.08);
  backdrop-filter: blur(10px);
}

.mobile-game-panel__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 11px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--accent-strong);
  cursor: pointer;
  list-style: none;
}

.mobile-game-panel__summary::-webkit-details-marker {
  display: none;
}

.mobile-game-panel__title {
  font-weight: 700;
}

.mobile-game-panel__meta {
  color: var(--text-soft);
  font-size: 0.88rem;
  font-weight: 600;
}

.mobile-game-panel__body {
  display: grid;
  gap: 8px;
  padding-top: 7px;
}

.mobile-game-panel[open] .mobile-game-panel__body {
  max-height: min(30vh, 244px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 2px;
  -webkit-overflow-scrolling: touch;
}

.mobile-game-panel[open] .mobile-game-panel__body::-webkit-scrollbar {
  width: 8px;
}

.mobile-game-panel[open] .mobile-game-panel__body::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(140, 169, 201, 0.46);
}

.mobile-game-panel__stats {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.mobile-game-panel__actions,
.mobile-game-panel__settings {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.mobile-game-panel__actions .action-button,
.mobile-game-panel__settings .setting-chip {
  width: 100%;
  min-height: 46px;
  justify-content: center;
}

.mobile-game-panel__status,
.mobile-game-panel__modes {
  grid-column: 1 / -1;
}

body.theme-dark .mobile-game-panel__summary {
  background: rgba(20, 29, 43, 0.96);
  border-color: rgba(92, 124, 160, 0.28);
  color: var(--accent-strong);
  box-shadow: 0 14px 30px rgba(3, 8, 15, 0.22);
}

body.theme-dark .mobile-game-panel[open] {
  background: rgba(16, 24, 36, 0.86);
  border-color: rgba(92, 124, 160, 0.24);
  box-shadow: 0 16px 36px rgba(2, 8, 16, 0.24);
}

body.theme-dark .mobile-game-panel__meta {
  color: var(--text-soft);
}

body.theme-dark .mobile-game-panel .hud-card {
  background: rgba(14, 24, 37, 0.94);
  border-color: rgba(92, 124, 160, 0.26);
}

body.theme-dark .mobile-game-panel .action-button,
body.theme-dark .mobile-game-panel .setting-chip,
body.theme-dark .mobile-game-panel .difficulty-tabs button {
  background: rgba(22, 34, 50, 0.96);
  border-color: rgba(92, 124, 160, 0.28);
  color: var(--text);
}

body.theme-dark .mobile-game-panel .action-button:hover,
body.theme-dark .mobile-game-panel .action-button:focus-visible,
body.theme-dark .mobile-game-panel .setting-chip:hover,
body.theme-dark .mobile-game-panel .setting-chip:focus-visible,
body.theme-dark .mobile-game-panel .setting-chip.is-active,
body.theme-dark .mobile-game-panel .difficulty-tabs button:hover,
body.theme-dark .mobile-game-panel .difficulty-tabs button:focus-visible,
body.theme-dark .mobile-game-panel .difficulty-tabs button.is-current {
  border-color: rgba(109, 170, 245, 0.42);
  background: rgba(109, 170, 245, 0.2);
  color: var(--accent-strong);
}

body.theme-dark .mobile-game-panel[open] .mobile-game-panel__body::-webkit-scrollbar-thumb {
  background: rgba(109, 170, 245, 0.34);
}

body.theme-dark .mobile-game-panel--kids .kids-button {
  background: rgba(22, 34, 50, 0.96);
  border-color: rgba(92, 124, 160, 0.28);
  color: var(--text);
}

body.theme-dark .mobile-game-panel--kids .kids-button:hover,
body.theme-dark .mobile-game-panel--kids .kids-button:focus-visible {
  background: rgba(109, 170, 245, 0.18);
  border-color: rgba(109, 170, 245, 0.38);
  color: var(--accent-strong);
}

body.theme-dark .mobile-game-panel--kids .kids-button.is-active {
  background: rgba(62, 122, 80, 0.28);
  border-color: rgba(108, 196, 132, 0.34);
  color: #d3f6dc;
}

body.theme-dark .mobile-game-panel--kids .kids-button--soft {
  background: rgba(26, 38, 54, 0.92);
  color: var(--text-soft);
}

body.mode-warm .mobile-game-panel__summary {
  background: rgba(37, 32, 27, 0.98);
  border-color: rgba(139, 123, 99, 0.28);
  color: var(--accent-strong);
  box-shadow: 0 14px 30px rgba(10, 7, 4, 0.2);
}

body.mode-warm .mobile-game-panel[open] {
  background: rgba(37, 32, 27, 0.88);
  border-color: rgba(139, 123, 99, 0.28);
  box-shadow: 0 16px 36px rgba(10, 7, 4, 0.24);
}

body.mode-warm .mobile-game-panel__meta {
  color: rgba(237, 230, 217, 0.92);
}

body.mode-warm .mobile-game-panel .hud-card {
  background: rgba(28, 24, 20, 0.98);
  border-color: rgba(139, 123, 99, 0.3);
}

body.mode-warm .mobile-game-panel .hud-card__label,
body.mode-warm .mobile-game-panel .hud-card__copy,
body.mode-warm .mobile-game-panel .status-line {
  color: rgba(232, 223, 209, 0.88);
}

body.mode-warm .mobile-game-panel .hud-card__value {
  color: #f7efdf;
}

body.mode-warm .mobile-game-panel .action-button,
body.mode-warm .mobile-game-panel .setting-chip,
body.mode-warm .mobile-game-panel .difficulty-tabs button,
body.mode-warm .mobile-game-panel--kids .kids-button {
  background: rgba(33, 28, 23, 0.98);
  border-color: rgba(139, 123, 99, 0.34);
  color: #f3ebde;
}

body.mode-warm .mobile-game-panel .action-button:hover,
body.mode-warm .mobile-game-panel .action-button:focus-visible,
body.mode-warm .mobile-game-panel .setting-chip:hover,
body.mode-warm .mobile-game-panel .setting-chip:focus-visible,
body.mode-warm .mobile-game-panel .setting-chip.is-active,
body.mode-warm .mobile-game-panel .difficulty-tabs button:hover,
body.mode-warm .mobile-game-panel .difficulty-tabs button:focus-visible,
body.mode-warm .mobile-game-panel .difficulty-tabs button.is-current,
body.mode-warm .mobile-game-panel--kids .kids-button:hover,
body.mode-warm .mobile-game-panel--kids .kids-button:focus-visible {
  background: rgba(232, 199, 138, 0.16);
  border-color: rgba(232, 199, 138, 0.34);
  color: var(--accent-strong);
}

body.mode-warm .mobile-game-panel--kids .kids-button.is-active {
  background: rgba(88, 114, 82, 0.3);
  border-color: rgba(139, 202, 145, 0.32);
  color: #e0f2dc;
}

body.mode-warm .mobile-game-panel--kids .kids-button--soft {
  background: rgba(46, 40, 33, 0.94);
  color: var(--text-soft);
}

.difficulty-tabs--mobile {
  width: 100%;
  margin: 0;
}

.hud-card {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 18px;
  border: 1px solid rgba(140, 169, 201, 0.22);
  background: rgba(255, 255, 255, 0.56);
}

.hud-card__label {
  color: var(--text-soft);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hud-card__value {
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.15;
}

.hud-card__copy {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.9rem;
  line-height: 1.5;
}

.game-sidebar--right .status-line {
  min-height: 0;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.divider {
  width: min(calc(100% - 32px), var(--content-width));
  margin: 16px auto 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(140, 169, 201, 0), rgba(140, 169, 201, 0.6), rgba(140, 169, 201, 0));
}

.content-section,
.page-section,
.error-page,
.policy-page {
  padding: 36px 0 72px;
}

.screen-content {
  position: relative;
  background:
    linear-gradient(180deg, rgba(248, 251, 255, 0.7) 0%, rgba(239, 245, 252, 0.78) 100%);
}

.screen-content::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("/assets/patterns/sudoku-pattern.svg");
  background-repeat: repeat;
  background-size: 240px 240px;
  opacity: 0.68;
  pointer-events: none;
  z-index: 0;
}

.screen-content__scroll {
  position: relative;
  z-index: 1;
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 20px 0 24px;
}

.screen-content__scroll::-webkit-scrollbar {
  width: 10px;
}

.screen-content__scroll::-webkit-scrollbar-thumb {
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  background: rgba(140, 169, 201, 0.56);
}

.screen-content .content-section {
  padding: 0 0 32px;
}

.screen-content .divider {
  margin-top: 0;
  margin-bottom: 20px;
}

.screen-content .site-footer {
  padding-bottom: 18px;
}

.screen-content__back {
  display: flex;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 5;
  width: min(calc(100% - 32px), var(--site-width));
  margin: 0 auto 12px;
  padding: 2px 0 8px;
}

.screen-content__back .screen-toggle {
  min-height: 46px;
  padding: 10px 16px;
  border-radius: 18px;
  box-shadow: none;
  background: rgba(255, 255, 255, 0.92);
}

body.theme-dark .screen-content__back .screen-toggle {
  background: rgba(20, 29, 43, 0.94);
}

.content-shell {
  width: min(calc(100% - 32px), var(--content-width));
  margin: 0 auto;
}

.section-block {
  margin-bottom: 42px;
}

.section-block:last-child,
.faq-grid:last-child,
.policy-copy > *:last-child {
  margin-bottom: 0;
}

.section-block h2,
.faq-grid h2,
.policy-copy h1,
.page-copy h2 {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 2.6vw, 2.15rem);
  letter-spacing: -0.03em;
}

.section-block p,
.section-block li,
.page-copy li {
  color: var(--text-soft);
  line-height: 1.72;
}

.section-block ul,
.page-copy ul,
.policy-copy ul {
  margin: 14px 0 0;
  padding-left: 20px;
}

.link-grid,
.faq-list,
.footer-nav {
  display: grid;
  gap: 12px;
}

.link-grid {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.link-card {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid rgba(140, 169, 201, 0.26);
  background: rgba(255, 255, 255, 0.82);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.link-card:hover,
.link-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(47, 125, 225, 0.34);
  box-shadow: 0 18px 30px rgba(37, 86, 138, 0.08);
}

.link-card strong {
  font-size: 1.03rem;
}

.link-card span {
  color: var(--text-soft);
  line-height: 1.6;
}

.article-cta {
  display: grid;
  gap: 12px;
  margin-top: 12px;
  padding: 24px;
  border-radius: 24px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  background: rgba(244, 248, 253, 0.92);
}

.article-cta h2 {
  margin: 0;
  font-size: clamp(1.3rem, 2.1vw, 1.6rem);
  letter-spacing: -0.03em;
}

.article-cta p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.68;
}

.faq-list {
  grid-template-columns: 1fr;
}

.faq__item {
  padding: 20px;
  border-radius: 22px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  background: rgba(255, 255, 255, 0.82);
}

.faq__item h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.faq__item p {
  margin: 0;
}

.site-footer {
  padding: 0 0 36px;
}

.site-footer__card {
  display: grid;
  gap: 14px;
  padding: 20px;
  border-radius: 24px;
  border: 1px solid rgba(140, 169, 201, 0.26);
  background: rgba(255, 255, 255, 0.82);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  align-items: center;
  justify-content: flex-start;
}

.footer-nav a {
  display: inline-flex;
  align-items: center;
  color: var(--text-soft);
  line-height: 1.4;
}

.footer-note {
  margin: 0;
  color: var(--text-soft);
}

.site-footer__credit {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.875rem;
  opacity: 0.82;
}

.site-footer__credit a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, opacity 0.2s ease, color 0.2s ease;
}

.site-footer__credit a:hover,
.site-footer__credit a:focus-visible {
  color: var(--text);
  border-bottom-color: currentColor;
  opacity: 1;
}

.site-footer__credit a:focus-visible {
  outline: 2px solid rgba(47, 125, 225, 0.22);
  outline-offset: 3px;
  border-radius: 4px;
}

body.theme-dark .game-sidebar__group,
body.theme-dark .hud-card {
  background: rgba(18, 31, 45, 0.82);
  border-color: rgba(92, 124, 160, 0.24);
}

body.mode-warm .game-sidebar__group,
body.mode-warm .hud-card,
body.mode-warm .link-card,
body.mode-warm .faq__item,
body.mode-warm .site-footer__card,
body.mode-warm .page-card,
body.mode-warm .error-card,
body.mode-warm .policy-card,
body.mode-warm .article-cta,
body.mode-warm .modal__card {
  background: rgba(37, 32, 27, 0.96);
  border-color: rgba(139, 123, 99, 0.26);
}

body.mode-warm .hud-card__label,
body.mode-warm .hud-card__copy,
body.mode-warm .status-line,
body.mode-warm .page-copy,
body.mode-warm .policy-copy {
  color: rgba(232, 223, 209, 0.88);
}

body.mode-warm .hud-card__value,
body.mode-warm .app-card__title,
body.mode-warm .page-card h1,
body.mode-warm .page-card h2,
body.mode-warm .error-card h1,
body.mode-warm .policy-card h1,
body.mode-warm .policy-card h2 {
  color: #f7efdf;
}

body.theme-dark .board-wrap {
  background: rgba(20, 31, 46, 0.92);
  box-shadow: 0 18px 38px rgba(2, 8, 16, 0.32);
}

body.mode-warm .board-wrap {
  background: rgba(46, 40, 33, 0.94);
  box-shadow: 0 18px 38px rgba(10, 7, 4, 0.28);
}

body.theme-dark .game-sidebar--right .screen-toggle {
  background: var(--button-bg);
}

body.mode-warm .game-sidebar--right .screen-toggle {
  background: var(--button-bg);
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(19, 38, 60, 0.3);
  backdrop-filter: blur(10px);
  z-index: 30;
}

.modal.is-open {
  display: flex;
}

.modal__card {
  position: relative;
  overflow: hidden;
  width: min(100%, 420px);
  padding: 28px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 50px rgba(20, 48, 79, 0.18);
}

.modal__card::before {
  content: "";
  position: absolute;
  inset: -18% -10% auto;
  height: 150px;
  background:
    radial-gradient(circle at 12% 34%, rgba(255, 205, 92, 0.55) 0 7px, transparent 8px),
    radial-gradient(circle at 28% 18%, rgba(87, 175, 255, 0.46) 0 6px, transparent 7px),
    radial-gradient(circle at 44% 26%, rgba(131, 229, 174, 0.45) 0 7px, transparent 8px),
    radial-gradient(circle at 62% 16%, rgba(255, 144, 166, 0.42) 0 6px, transparent 7px),
    radial-gradient(circle at 78% 30%, rgba(136, 194, 255, 0.4) 0 7px, transparent 8px),
    radial-gradient(circle at 90% 20%, rgba(255, 213, 120, 0.42) 0 6px, transparent 7px);
  opacity: 0;
  pointer-events: none;
}

.modal__card h2 {
  margin: 0 0 8px;
  font-size: 1.8rem;
  letter-spacing: -0.04em;
}

.modal__card p {
  margin: 0 0 12px;
  color: var(--text-soft);
  line-height: 1.66;
}

.modal__actions {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.modal__detail {
  font-size: 0.98rem;
}

.modal__praise {
  margin: 4px 0 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-strong);
}

.modal--celebrate .modal__card {
  animation: modal-pop 0.34s ease;
}

.modal--celebrate .modal__card::before {
  animation: modal-spark 0.72s ease forwards;
}

.cta-button--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 14px 28px rgba(47, 125, 225, 0.24);
}

.cta-button--primary:hover,
.cta-button--primary:focus-visible {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #fff;
}

@keyframes modal-pop {
  0% {
    transform: translateY(10px) scale(0.97);
  }
  100% {
    transform: translateY(0) scale(1);
  }
}

@keyframes modal-spark {
  0% {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
  35% {
    opacity: 1;
  }
  100% {
    opacity: 0.8;
    transform: translateY(0) scale(1);
  }
}

.page-hero {
  padding: 28px 0 18px;
}

.page-card,
.error-card,
.policy-card {
  padding: 30px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(140, 169, 201, 0.26);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

body.theme-dark .screen-toggle:hover,
body.theme-dark .screen-toggle:focus-visible,
body.theme-dark .action-button:hover,
body.theme-dark .action-button:focus-visible,
body.theme-dark .number-button:hover,
body.theme-dark .number-button:focus-visible,
body.theme-dark .cta-button:hover,
body.theme-dark .cta-button:focus-visible {
  background: rgba(109, 170, 245, 0.22);
}

body.theme-dark .cell--mistake {
  background: rgba(123, 53, 71, 0.5);
  color: #ffd2db;
}

body.theme-dark .link-card,
body.theme-dark .faq__item,
body.theme-dark .site-footer__card,
body.theme-dark .page-card,
body.theme-dark .error-card,
body.theme-dark .policy-card,
body.theme-dark .article-cta,
body.theme-dark .modal__card {
  background: rgba(20, 29, 43, 0.92);
}

body.theme-dark .modal__praise {
  color: #8ac5ff;
}

body.theme-dark .screen-content {
  background: linear-gradient(180deg, rgba(16, 24, 36, 0.72) 0%, rgba(10, 18, 28, 0.8) 100%);
}

body.mode-warm .screen-content {
  background: linear-gradient(180deg, rgba(39, 33, 27, 0.76) 0%, rgba(27, 22, 18, 0.84) 100%);
}

body.theme-dark .screen-content::before {
  background-image: url("/assets/patterns/sudoku-pattern-dark.svg");
  opacity: 0.75;
}

body.mode-warm .screen-content::before {
  background-image: url("/assets/patterns/sudoku-pattern-dark.svg");
  opacity: 0.62;
}

body.mode-warm .modal__praise {
  color: #e8c78a;
}

body.kids-theme .screen-content::before {
  background-image: url("/assets/patterns/sudoku-pattern-kids.svg");
  opacity: 0.74;
}

body.kids-theme.theme-dark .screen-content::before {
  background-image: url("/assets/patterns/sudoku-pattern-kids-dark.svg");
  opacity: 0.8;
}

body.theme-dark .screen-content__scroll::-webkit-scrollbar-thumb {
  border-color: rgba(20, 29, 43, 0.92);
  background: rgba(92, 124, 160, 0.72);
}

body.mode-warm .screen-content__scroll::-webkit-scrollbar-thumb {
  border-color: rgba(44, 38, 31, 0.92);
  background: rgba(139, 123, 99, 0.68);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.breadcrumbs a {
  color: var(--accent-strong);
}

.page-copy,
.policy-copy {
  display: grid;
  gap: 14px;
}

.page-copy p,
.policy-copy p,
.page-copy ul,
.policy-copy ul,
.page-copy h2,
.policy-copy h2,
.page-copy h3,
.policy-copy h3 {
  margin: 0;
}

.policy-copy h2,
.page-copy h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.15rem);
  letter-spacing: -0.03em;
  margin-top: 20px;
}

.policy-copy h3,
.page-copy h3 {
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  margin-top: 10px;
}

.policy-copy p a,
.policy-copy li a,
.policy-copy h3 a,
.page-copy p a,
.page-copy li a,
.page-copy h3 a {
  color: var(--accent-strong);
  text-decoration-line: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.14em;
  text-decoration-color: rgba(47, 125, 225, 0.32);
  transition: color 0.18s ease, text-decoration-color 0.18s ease;
}

.policy-copy p a:hover,
.policy-copy p a:focus-visible,
.policy-copy li a:hover,
.policy-copy li a:focus-visible,
.policy-copy h3 a:hover,
.policy-copy h3 a:focus-visible,
.page-copy p a:hover,
.page-copy p a:focus-visible,
.page-copy li a:hover,
.page-copy li a:focus-visible,
.page-copy h3 a:hover,
.page-copy h3 a:focus-visible {
  color: var(--accent);
  text-decoration-color: currentColor;
}

.policy-copy p a:focus-visible,
.policy-copy li a:focus-visible,
.policy-copy h3 a:focus-visible,
.page-copy p a:focus-visible,
.page-copy li a:focus-visible,
.page-copy h3 a:focus-visible {
  outline: none;
  box-shadow: 0 2px 0 rgba(47, 125, 225, 0.22);
}

.error-card {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}

.error-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 68px;
  height: 68px;
  margin: 0 auto 16px;
  border-radius: 20px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 1.35rem;
  font-weight: 700;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 18px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.kids-shell {
  display: grid;
  gap: 24px;
}

.kids-selector-grid,
.kids-related-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.kids-mode-card,
.kids-daily-card {
  display: grid;
  gap: 10px;
  padding: 24px;
  border-radius: 26px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 16px 34px rgba(35, 74, 120, 0.08);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.kids-mode-card:hover,
.kids-mode-card:focus-visible,
.kids-daily-card:hover,
.kids-daily-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(47, 125, 225, 0.32);
  box-shadow: 0 20px 38px rgba(35, 74, 120, 0.1);
}

.kids-mode-card strong,
.kids-daily-card strong {
  font-size: 1.08rem;
  line-height: 1.2;
}

.kids-mode-card span,
.kids-daily-card span {
  color: var(--text-soft);
  line-height: 1.62;
}

body.theme-dark .kids-mode-card,
body.theme-dark .kids-daily-card {
  background: rgba(244, 248, 255, 0.96);
  border-color: rgba(140, 169, 201, 0.24);
  box-shadow: 0 16px 34px rgba(2, 8, 16, 0.14);
}

body.theme-dark .kids-mode-card strong,
body.theme-dark .kids-daily-card strong {
  color: #163b63;
}

body.theme-dark .policy-copy p a,
body.theme-dark .policy-copy li a,
body.theme-dark .policy-copy h3 a,
body.theme-dark .page-copy p a,
body.theme-dark .page-copy li a,
body.theme-dark .page-copy h3 a {
  color: #8ac5ff;
  text-decoration-color: rgba(138, 197, 255, 0.38);
}

body.theme-dark .policy-copy p a:hover,
body.theme-dark .policy-copy p a:focus-visible,
body.theme-dark .policy-copy li a:hover,
body.theme-dark .policy-copy li a:focus-visible,
body.theme-dark .policy-copy h3 a:hover,
body.theme-dark .policy-copy h3 a:focus-visible,
body.theme-dark .page-copy p a:hover,
body.theme-dark .page-copy p a:focus-visible,
body.theme-dark .page-copy li a:hover,
body.theme-dark .page-copy li a:focus-visible,
body.theme-dark .page-copy h3 a:hover,
body.theme-dark .page-copy h3 a:focus-visible {
  color: #afd7ff;
}

body.theme-dark .kids-mode-card span,
body.theme-dark .kids-daily-card span {
  color: #5b6f86;
}

body.mode-warm .kids-mode-card,
body.mode-warm .kids-daily-card {
  background: rgba(251, 246, 236, 0.97);
  border-color: rgba(180, 156, 122, 0.3);
  box-shadow: 0 16px 34px rgba(10, 7, 4, 0.16);
}

body.mode-warm .kids-mode-card strong,
body.mode-warm .kids-daily-card strong {
  color: #4b3f33;
}

body.mode-warm .policy-copy p a,
body.mode-warm .policy-copy li a,
body.mode-warm .policy-copy h3 a,
body.mode-warm .page-copy p a,
body.mode-warm .page-copy li a,
body.mode-warm .page-copy h3 a {
  color: #e8c78a;
  text-decoration-color: rgba(232, 199, 138, 0.38);
}

body.mode-warm .policy-copy p a:hover,
body.mode-warm .policy-copy p a:focus-visible,
body.mode-warm .policy-copy li a:hover,
body.mode-warm .policy-copy li a:focus-visible,
body.mode-warm .policy-copy h3 a:hover,
body.mode-warm .policy-copy h3 a:focus-visible,
body.mode-warm .page-copy p a:hover,
body.mode-warm .page-copy p a:focus-visible,
body.mode-warm .page-copy li a:hover,
body.mode-warm .page-copy li a:focus-visible,
body.mode-warm .page-copy h3 a:hover,
body.mode-warm .page-copy h3 a:focus-visible {
  color: #f2d8a4;
}

body.mode-warm .kids-mode-card span,
body.mode-warm .kids-daily-card span {
  color: #6b5d50;
}

.kids-mode-card__emoji {
  font-size: 1.8rem;
  line-height: 1;
}

.kids-play-card {
  display: grid;
  gap: 22px;
}

.kids-app {
  display: grid;
  gap: 20px;
}

.kids-app__hero {
  display: grid;
  gap: 18px;
}

.kids-app__title {
  margin: 8px 0 8px;
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  letter-spacing: -0.04em;
  line-height: 0.98;
}

.kids-app__intro {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.68;
}

.kids-stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.kids-stat {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  background: rgba(253, 250, 255, 0.9);
}

.kids-stat span {
  color: var(--text-soft);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.kids-stat strong {
  font-size: 1.18rem;
  line-height: 1.2;
}

.kids-app__play-area {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(180px, 220px) minmax(320px, 560px) minmax(220px, 280px);
  grid-template-areas: "left center right";
  align-items: start;
  justify-content: center;
}

.kids-side,
.kids-center {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 28px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 16px 36px rgba(35, 74, 120, 0.06);
}

.kids-side--left {
  grid-area: left;
}

.kids-side--right {
  grid-area: right;
}

.kids-center {
  grid-area: center;
  gap: 16px;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.kids-board-shell {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 28px;
  border: 1px solid rgba(140, 169, 201, 0.24);
  background: linear-gradient(180deg, rgba(255, 247, 236, 0.95), rgba(240, 249, 255, 0.95));
  box-shadow: 0 16px 36px rgba(35, 74, 120, 0.06);
}

.kids-board {
  --kids-grid-size: 4;
  display: grid;
  grid-template-columns: repeat(var(--kids-grid-size), minmax(0, 1fr));
  width: min(100%, 480px);
  margin: 0 auto;
  aspect-ratio: 1;
  border: 3px solid #8cb3db;
  border-radius: 0;
  overflow: hidden;
  background: #ffffff;
}

.kids-app--junior .kids-board {
  width: min(100%, 520px);
}

.kids-cell {
  display: grid;
  place-items: center;
  min-height: 72px;
  padding: 0;
  border: 0;
  border-right: 2px solid rgba(177, 206, 234, 0.72);
  border-bottom: 2px solid rgba(177, 206, 234, 0.72);
  background: rgba(255, 255, 255, 0.96);
  color: #19406b;
  font-size: clamp(1.6rem, 4.6vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  transition: transform 0.16s ease, background-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}

.kids-app--junior .kids-cell {
  min-height: 64px;
  font-size: clamp(1.2rem, 3.4vw, 1.8rem);
}

.kids-cell:nth-child(4n) {
  border-right: 0;
}

.kids-app--junior .kids-cell:nth-child(4n) {
  border-right: 2px solid rgba(177, 206, 234, 0.72);
}

.kids-app--junior .kids-cell:nth-child(6n) {
  border-right: 0;
}

.kids-cell:nth-last-child(-n + 4) {
  border-bottom: 0;
}

.kids-app--junior .kids-cell:nth-last-child(-n + 4) {
  border-bottom: 2px solid rgba(177, 206, 234, 0.72);
}

.kids-app--junior .kids-cell:nth-last-child(-n + 6) {
  border-bottom: 0;
}

.kids-cell--col-divider {
  border-right-width: 3px !important;
  border-right-color: #8cb3db !important;
}

.kids-cell--row-divider {
  border-bottom-width: 3px !important;
  border-bottom-color: #8cb3db !important;
}

.kids-cell--given {
  background: #eef7ff;
  color: #123f71;
}

.kids-cell--selected {
  background: #ffeec9;
  box-shadow: inset 0 0 0 3px rgba(255, 190, 74, 0.52);
}

.kids-cell--correct {
  background: #dff8e6;
  color: #1e7342;
}

.kids-cell--mistake {
  background: #ffe3e7;
  color: #c14861;
}

.kids-app--picture .kids-cell {
  font-size: clamp(1.85rem, 5vw, 2.6rem);
}

body.mode-dyslexia .kids-cell,
body.mode-dyslexia .kids-button--key {
  font-size: clamp(1.95rem, 5.2vw, 2.85rem);
}

body.mode-row-highlight .kids-cell--line-peer {
  background: var(--highlight-line);
}

body.mode-focus .kids-board .kids-cell {
  opacity: var(--focus-dim);
}

body.mode-focus .kids-cell--focus-block,
body.mode-focus .kids-cell--selected {
  opacity: 1;
}

.kids-status {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.62;
}

.kids-side .kids-status {
  min-height: 48px;
}

.kids-keypad {
  display: grid;
  gap: 10px;
  width: min(100%, 560px);
  margin: 0 auto;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.kids-app--junior .kids-keypad {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: min(100%, 520px);
}

.kids-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 12px 16px;
  border: 1px solid rgba(140, 169, 201, 0.28);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  font-weight: 700;
  text-align: center;
  transition: transform 0.16s ease, background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.kids-button:hover,
.kids-button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(47, 125, 225, 0.34);
  background: #eef7ff;
  color: var(--accent-strong);
}

.kids-button.is-active {
  border-color: rgba(78, 174, 108, 0.34);
  background: #ebfff0;
  color: #237448;
}

.kids-button--key {
  min-height: 68px;
  font-size: 1.35rem;
}

.kids-app--picture .kids-button--key {
  font-size: 1.8rem;
}

.kids-button--soft {
  background: rgba(250, 252, 255, 0.88);
  color: var(--text-soft);
}

.kids-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.kids-inline-links .cta-button {
  min-height: 48px;
}

.kids-cell:focus-visible,
.kids-button:focus-visible {
  outline: 3px solid rgba(47, 125, 225, 0.28);
  outline-offset: 2px;
}

.kids-side .kids-button {
  width: 100%;
}

.kids-side--left .kids-button {
  justify-content: flex-start;
}

.kids-side--right .kids-stats {
  grid-template-columns: 1fr;
}

.kids-side--right .kids-stat {
  background: rgba(253, 250, 255, 0.94);
}

body.theme-dark .kids-side,
body.theme-dark .kids-center,
body.theme-dark .kids-board-shell,
body.theme-dark .kids-stat {
  border-color: rgba(92, 124, 160, 0.24);
  background: rgba(20, 29, 43, 0.92);
  box-shadow: 0 16px 36px rgba(2, 8, 16, 0.18);
}

body.theme-dark .kids-board {
  border-color: #5c7ca0;
  background: #132131;
}

body.theme-dark .kids-cell {
  border-right-color: rgba(72, 98, 128, 0.74);
  border-bottom-color: rgba(72, 98, 128, 0.74);
  background: #132131;
  color: var(--text);
}

body.theme-dark .kids-cell--col-divider {
  border-right-color: #5c7ca0 !important;
}

body.theme-dark .kids-cell--row-divider {
  border-bottom-color: #5c7ca0 !important;
}

body.theme-dark .kids-cell--given {
  background: #1d3149;
  color: #eaf2ff;
}

body.theme-dark .kids-cell--selected {
  background: rgba(109, 170, 245, 0.16);
  box-shadow: inset 0 0 0 3px rgba(109, 170, 245, 0.42);
}

body.theme-dark .kids-cell--correct {
  background: rgba(62, 122, 80, 0.34);
  color: #d3f6dc;
}

body.theme-dark .kids-cell--mistake {
  background: rgba(123, 53, 71, 0.42);
  color: #ffd2db;
}

body.theme-dark .kids-button {
  background: rgba(22, 34, 50, 0.96);
  border-color: rgba(92, 124, 160, 0.28);
  color: var(--text);
}

body.theme-dark .kids-button:hover,
body.theme-dark .kids-button:focus-visible {
  background: rgba(109, 170, 245, 0.18);
  border-color: rgba(109, 170, 245, 0.38);
  color: var(--accent-strong);
}

body.theme-dark .kids-button.is-active {
  background: rgba(62, 122, 80, 0.28);
  border-color: rgba(108, 196, 132, 0.34);
  color: #d3f6dc;
}

body.theme-dark .kids-button--soft {
  background: rgba(26, 38, 54, 0.92);
  color: var(--text-soft);
}

body.theme-dark .kids-app__title,
body.theme-dark .kids-stat strong,
body.theme-dark .kids-status,
body.theme-dark .kids-app__intro {
  color: var(--text);
}

body.theme-dark .kids-stat span,
body.theme-dark .kids-status,
body.theme-dark .kids-app__intro {
  color: var(--text-soft);
}

body.mode-warm .kids-side,
body.mode-warm .kids-center,
body.mode-warm .kids-board-shell,
body.mode-warm .kids-stat {
  border-color: rgba(139, 123, 99, 0.34);
  background: rgba(31, 27, 23, 0.98);
  box-shadow: 0 16px 36px rgba(10, 7, 4, 0.16);
}

body.mode-warm .kids-board {
  border-color: #8b7b63;
  background: #2b251f;
}

body.mode-warm .kids-cell {
  border-right-color: rgba(106, 94, 79, 0.72);
  border-bottom-color: rgba(106, 94, 79, 0.72);
  background: #2b251f;
  color: var(--text);
}

body.mode-warm .kids-cell--col-divider {
  border-right-color: #8b7b63 !important;
}

body.mode-warm .kids-cell--row-divider {
  border-bottom-color: #8b7b63 !important;
}

body.mode-warm .kids-cell--given {
  background: #352d25;
  color: #fff4e2;
}

body.mode-warm .kids-cell--selected {
  background: rgba(232, 199, 138, 0.2);
  box-shadow: inset 0 0 0 3px rgba(232, 199, 138, 0.5);
}

body.mode-warm .kids-cell--correct {
  background: rgba(96, 132, 92, 0.34);
  color: #d7f1d0;
}

body.mode-warm .kids-cell--mistake {
  background: rgba(118, 70, 60, 0.38);
  color: #ffd6d0;
}

body.mode-warm .kids-app__title,
body.mode-warm .kids-stat strong,
body.mode-warm .kids-status,
body.mode-warm .kids-app__intro {
  color: #f5edde;
}

body.mode-warm .kids-stat span,
body.mode-warm .kids-status,
body.mode-warm .kids-app__intro {
  color: rgba(232, 223, 209, 0.9);
}

@media (min-width: 720px) {
  .app-card,
  .page-card,
  .policy-card {
    padding: 28px;
  }

  .difficulty-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .app-controls {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .number-pad {
    grid-template-columns: repeat(9, minmax(0, 1fr));
  }

  .modal__actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .play-area {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
  }
}

@media (max-width: 959px) {
  .app-page .site-header {
    padding: 8px 0 6px;
  }

  .site-header__bar,
  .app-page .site-header__bar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 6px;
    padding: 7px 9px;
    border-radius: 20px;
  }

  .brand,
  .app-page .brand {
    grid-column: 1;
    grid-row: 1;
  }

  .brand__logo,
  .app-page .brand__logo {
    height: 28px;
    max-width: min(170px, 44vw);
  }

  .site-header__tools,
  .app-page .site-header__tools {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .site-nav__toggle {
    display: inline-flex;
  }

  .site-header__tools {
    gap: 8px;
  }

  .a11y-modes__toggle {
    display: inline-flex;
    width: 44px;
    min-height: 44px;
    padding: 0;
    border-radius: 16px;
  }

  .a11y-modes__toggle-label {
    display: none;
  }

  .a11y-modes__list {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    display: none;
    width: min(260px, calc(100vw - 32px));
    padding: 8px;
    border: 1px solid rgba(140, 169, 201, 0.22);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 12px 28px rgba(21, 58, 92, 0.08);
    z-index: 26;
  }

  .a11y-modes.is-open .a11y-modes__list {
    display: grid;
    gap: 8px;
  }

  .a11y-mode-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: stretch;
    gap: 8px;
  }

  .a11y-mode-button {
    width: 100%;
    height: auto;
    justify-content: flex-start;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 14px;
    box-shadow: none;
  }

  .a11y-mode-button__label {
    display: inline;
    font-size: 0.88rem;
    font-weight: 600;
  }

  .a11y-mode-help {
    width: 36px;
    height: auto;
    min-height: 44px;
    font-size: 0.84rem;
    opacity: 0.78;
  }

  .site-nav,
  .app-page .site-nav {
    display: none;
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    min-width: 0;
    gap: 8px;
  }

  .site-header__bar.is-nav-open .site-nav,
  .app-page .site-header__bar.is-nav-open .site-nav {
    display: grid;
    grid-template-columns: 1fr;
    padding: 6px;
    border: 1px solid rgba(140, 169, 201, 0.22);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 12px 28px rgba(21, 58, 92, 0.05);
  }

  .site-nav a,
  .app-page .site-nav a {
    display: block;
    width: 100%;
    padding: 9px 12px;
    text-align: left;
    white-space: normal;
    font-size: 0.88rem;
  }

  body.theme-dark .site-header__bar.is-nav-open .site-nav,
  body.theme-dark.app-page .site-header__bar.is-nav-open .site-nav {
    background: rgba(20, 29, 43, 0.94);
    border-color: rgba(108, 145, 188, 0.24);
  }

  body.mode-warm .site-header__bar.is-nav-open .site-nav,
  body.mode-warm.app-page .site-header__bar.is-nav-open .site-nav {
    background: rgba(44, 38, 31, 0.96);
    border-color: rgba(139, 123, 99, 0.24);
  }

  body.theme-dark .a11y-modes__list {
    background: rgba(20, 29, 43, 0.96);
    border-color: rgba(108, 145, 188, 0.24);
  }

  body.mode-warm .a11y-modes__list {
    background: rgba(44, 38, 31, 0.96);
    border-color: rgba(139, 123, 99, 0.26);
  }

  .app-page .screen-game {
    padding-top: 76px;
  }

  .screen-game .play-area {
    grid-template-columns: 1fr;
    grid-template-areas:
      "center"
      "right"
      "left";
    gap: 14px;
  }

  .kids-app__play-area {
    grid-template-columns: 1fr;
    grid-template-areas:
      "center"
      "right"
      "left";
    gap: 16px;
  }

  .mobile-game-panel {
    display: block;
    width: min(100%, 80vw);
    max-width: 336px;
    margin: 16px auto 8px;
  }

  .screen-game .board-panel > .difficulty-tabs:not(.difficulty-tabs--mobile) {
    display: none;
  }

  .screen-game .game-sidebar,
  .screen-game .game-sidebar--left,
  .screen-game .game-sidebar--right,
  .screen-game .game-sidebar__group,
  .screen-game .game-sidebar__group--top,
  .screen-game .game-sidebar__group--actions {
    display: none !important;
  }

  .kids-center > .mobile-game-panel {
    display: block;
    width: min(100%, 80vw);
    max-width: 336px;
    margin: 16px auto 8px;
  }

  .kids-side--left,
  .kids-side--right {
    display: none;
  }

  .button--icon-only-mobile {
    min-width: 44px;
    padding-left: 10px;
    padding-right: 10px;
  }

  .button--icon-only-mobile .button-label {
    display: none;
  }

  .button--icon-only-mobile .button-icon {
    width: 19px;
    height: 19px;
    flex-basis: 19px;
  }
}

@media (max-width: 719px) {
  .site-shell,
  .content-shell {
    width: min(calc(100% - 24px), 100%);
  }

  .site-header__bar {
    padding: 8px 9px;
    border-radius: 22px;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .hero {
    padding-top: 14px;
  }

  .screen-game {
    padding-top: 74px;
    padding-bottom: 14px;
  }

  .app-card {
    padding: 18px 16px;
  }

  .board-wrap {
    width: min(100%, 94vw);
  }

  .cell__value {
    font-size: clamp(1rem, 5vw, 1.45rem);
  }

  .action-button {
    min-height: 48px;
  }

  .number-button {
    min-height: 54px;
  }

  .page-card,
  .error-card,
  .policy-card {
    padding: 22px 18px;
  }

  .screen-toggle {
    width: 100%;
    min-width: 0;
    max-width: none;
  }

  .screen-game__cta .screen-toggle {
    width: min(100%, 320px);
    min-height: 48px;
    padding: 8px 14px;
    gap: 10px;
    border-radius: 16px;
  }

  .screen-game__cta .screen-toggle__icon {
    width: 34px;
    height: 34px;
    font-size: 1.1rem;
  }

  .screen-game__cta .screen-toggle__title {
    font-size: 0.98rem;
    line-height: 1.15;
  }

  .screen-game__cta .screen-toggle__meta {
    display: none;
  }

  .screen-game__cta {
    width: min(calc(100% - 24px), 100%);
    bottom: calc(env(safe-area-inset-bottom, 0px) + 8px);
    justify-content: center;
    padding: 0 0 4px;
  }

  .screen-game .site-shell {
    padding-bottom: calc(124px + env(safe-area-inset-bottom, 0px));
  }

  .screen-game .kids-shell {
    padding-bottom: calc(136px + env(safe-area-inset-bottom, 0px));
  }

  .screen-game .play-area {
    grid-template-columns: 1fr;
    grid-template-areas:
      "center"
      "right";
    gap: 14px;
  }

  .screen-game .difficulty-tabs,
  .screen-game .board-wrap,
  .screen-game .number-pad {
    width: min(100%, 92vw);
  }

  .screen-game .board-wrap {
    width: min(100%, 50vh, 92vw);
  }

  .screen-game .number-pad {
    grid-template-columns: repeat(9, minmax(0, 1fr));
  }

  .screen-game .number-button {
    min-height: 44px;
    padding: 8px 0;
    font-size: 1rem;
  }

  .mobile-game-panel__actions,
  .mobile-game-panel__settings,
  .mobile-game-panel--kids .mobile-game-panel__actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-sidebar__group {
    padding: 12px;
    border-radius: 18px;
  }

  .game-sidebar--right .game-hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-sidebar--right .hud-card--status,
  .game-sidebar--right .hud-card:last-child {
    grid-column: 1 / -1;
  }

  .game-sidebar--left .action-button,
  .game-sidebar--left .setting-chip,
  .game-sidebar--right .action-button--compact {
    min-height: 46px;
    justify-content: center;
  }

  .game-sidebar--left .game-settings {
    gap: 8px;
  }

  .kids-app__play-area {
    grid-template-columns: 1fr;
    grid-template-areas: "center";
    gap: 16px;
  }

  .kids-center,
  .kids-side {
    border-radius: 22px;
  }

  .kids-board {
    width: min(100%, 92vw);
  }

  .kids-app--junior .kids-board {
    width: min(100%, 78vw);
  }

  .kids-app--junior .kids-cell {
    min-height: 0;
    font-size: clamp(1rem, 4vw, 1.38rem);
  }

  .kids-keypad {
    width: min(100%, 92vw);
  }

  .kids-app--junior .kids-keypad {
    width: min(100%, 78vw);
  }

  .kids-app--junior .kids-button--key {
    min-height: 58px;
    font-size: 1.18rem;
  }

  .kids-side--left .kids-button {
    justify-content: center;
  }

  .kids-side--right .kids-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 430px) {
  .screen-game .board-wrap,
  .screen-game .number-pad {
    width: min(100%, 89vw);
  }

  .screen-game .board-wrap {
    width: min(100%, 48.5vh, 89vw);
  }

  .screen-game .number-button {
    min-height: 40px;
    padding: 6px 0;
    font-size: 0.96rem;
  }
}

@media (max-height: 860px) {
  .screen-game {
    padding-top: 88px;
  }

  .screen-game .site-shell {
    gap: 0;
    padding-bottom: 14px;
  }

  .screen-game .board-wrap {
    width: min(100%, 48vh, 500px);
  }

  .screen-game .number-button {
    min-height: 48px;
  }

  .game-sidebar__group {
    padding: 12px;
  }

  .screen-game .action-button,
  .screen-game .setting-chip,
  .screen-game .action-button--compact,
  .screen-game .screen-toggle {
    min-height: 34px;
    padding: 6px 10px;
    font-size: 0.85rem;
  }

  .screen-game__cta {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 10px);
  }
}