:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #302820;
  background: #f3efe7;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --accent: #337a8e;
  --accent-dark: #245766;
  --text: #302820;
  --muted: #827466;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  padding: clamp(0.8rem, 3vh, 2rem) 0.75rem;
  background:
    radial-gradient(ellipse at 50% 0, rgb(255 255 255 / 88%), transparent 58%),
    #f3efe7;
}

button,
select {
  font: inherit;
}

.game {
  width: min(100%, 590px);
  margin: 0 auto;
}

.page-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 0.8rem 0.2rem;
}

.brand-mark {
  display: grid;
  width: 2.55rem;
  height: 2.55rem;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid #2b6b7c;
  border-radius: 0.7rem;
  background: var(--accent);
  box-shadow: 0 3px 7px rgb(36 87 102 / 20%);
  color: white;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.8rem;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 0.1rem;
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.55rem, 5vw, 1.95rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.game-card {
  padding: clamp(0.65rem, 2vw, 1.05rem);
  border: 1px solid #e2dacc;
  border-radius: 1rem;
  background: #fffdf9;
  box-shadow: 0 15px 40px rgb(62 48 29 / 10%), 0 2px 5px rgb(62 48 29 / 5%);
}

.status-bar {
  display: flex;
  min-height: 2.55rem;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid #eee7db;
  border-radius: 0.65rem;
  background: #f8f5ef;
}

.status-indicator {
  width: 0.65rem;
  height: 0.65rem;
  flex: 0 0 auto;
  border: 2px solid rgb(38 48 61 / 12%);
  border-radius: 50%;
  background: var(--accent);
}

.status-bar p {
  flex: 1;
  margin: 0;
  color: #34445a;
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.35;
}

.status-bar time {
  flex: 0 0 auto;
  color: var(--accent-dark);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 750;
}

.status-bar[data-state="error"] {
  border-color: #edc2bf;
  background: #fff2f0;
}

.status-bar[data-state="error"] p {
  color: #8d2f31;
}

.status-bar[data-state="error"] .status-indicator {
  background: #c34b43;
}

.status-bar[data-state="success"] .status-indicator {
  background: #32815f;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin: 0.6rem 0;
}

.difficulty-control {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: #655b4e;
  font-size: 0.76rem;
  font-weight: 700;
}

.difficulty-control select {
  min-height: 2.25rem;
  padding: 0.35rem 1.65rem 0.35rem 0.55rem;
  border: 1px solid #d8cebe;
  border-radius: 0.5rem;
  background-color: #fffdf9;
  color: #34445a;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 700;
}

.difficulty-control select:focus-visible {
  outline: 3px solid #a9d0dc;
  outline-offset: 2px;
}

.board-wrap {
  width: 100%;
  padding: clamp(0.32rem, 1.4vw, 0.55rem);
  border: 1px solid #805536;
  border-radius: 0.68rem;
  background: linear-gradient(135deg, #9e6d48, #805536);
  box-shadow: 0 4px 0 #5d402d, 0 8px 13px rgb(43 49 60 / 13%);
}

.sudoku-board {
  display: grid;
  width: 100%;
  aspect-ratio: 1;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  grid-template-rows: repeat(9, minmax(0, 1fr));
  overflow: hidden;
  border: 2px solid var(--accent-dark);
  border-radius: 0.25rem;
  background: #fffaf2;
}

.sudoku-cell {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 0;
  padding: 0;
  place-items: center;
  border: 0;
  border-right: 1px solid #b3a796;
  border-bottom: 1px solid #b3a796;
  background: #fffaf2;
  color: var(--accent-dark);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.sudoku-cell.box-right {
  border-right: 2px solid #65503e;
}

.sudoku-cell.box-bottom {
  border-bottom: 2px solid #65503e;
}

.sudoku-cell.is-given {
  background: #eadfce;
  color: #302820;
  font-weight: 750;
}

.sudoku-cell.is-peer {
  background: #e7eef0;
}

.sudoku-cell.is-same-number {
  background: #d3e5eb;
}

.sudoku-cell.is-selected {
  z-index: 1;
  background: #b8d9e8;
  box-shadow: inset 0 0 0 2px #337a8e;
}

.sudoku-cell.is-wrong {
  background: #f3c2b8;
  color: #922f2a;
}

.sudoku-cell:focus-visible {
  z-index: 2;
  outline: 2px solid #174d5b;
  outline-offset: -2px;
}

.cell-value {
  font-size: clamp(0.82rem, 5vw, 1.65rem);
  line-height: 1;
}

.cell-notes {
  position: absolute;
  inset: 1px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  color: #657b91;
  font-size: clamp(0.34rem, 1.7vw, 0.57rem);
  font-weight: 600;
  line-height: 1;
  pointer-events: none;
}

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

.game-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
  margin-top: 0.85rem;
}

.action-button {
  min-height: 2.35rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid #d5cab9;
  border-radius: 0.55rem;
  background: #f8f5ef;
  color: #34445a;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 750;
  transition: background-color 120ms ease, transform 120ms ease;
}

.action-button:not(:disabled):hover {
  background: #eee8dd;
}

.action-button:not(:disabled):active {
  transform: translateY(1px);
}

.action-button:focus-visible,
.number-button:focus-visible {
  outline: 3px solid #a9d0dc;
  outline-offset: 2px;
}

.action-primary,
.action-check {
  border-color: #245766;
  background: var(--accent);
  box-shadow: 0 2px 0 var(--accent-dark);
  color: white;
}

.action-check {
  border-color: #296d53;
  background: #32815f;
  box-shadow: 0 2px 0 #226246;
}

.action-primary:not(:disabled):hover {
  background: #2b6b7c;
}

.action-check:not(:disabled):hover {
  background: #286e51;
}

.action-button[aria-pressed="true"] {
  border-color: #245766;
  background: #d3e5eb;
  color: #1d4b58;
}

.action-button:disabled,
.difficulty-control select:disabled,
.number-button:disabled {
  cursor: wait;
  opacity: 0.58;
}

.number-pad {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: clamp(0.2rem, 1vw, 0.38rem);
  margin-top: 0.75rem;
}

.number-button {
  min-width: 0;
  min-height: 2.35rem;
  padding: 0.25rem 0;
  border: 1px solid #d9e3e6;
  border-radius: 0.48rem;
  background: #eef4f5;
  color: var(--accent-dark);
  cursor: pointer;
  font-size: clamp(0.83rem, 4vw, 1.05rem);
  font-weight: 750;
}

.number-button:not(:disabled):hover {
  background: #dcebee;
}

.instructions {
  margin: 0.8rem 0 0.15rem;
  color: var(--muted);
  font-size: 0.69rem;
  line-height: 1.45;
  text-align: center;
}

.page-footer {
  margin-top: 1rem;
  color: #8b857b;
  font-size: 0.68rem;
  text-align: center;
}

@media (max-width: 390px) {
  body {
    padding-right: 0.45rem;
    padding-left: 0.45rem;
  }

  .game-card {
    padding: 0.5rem;
  }

  .status-bar {
    gap: 0.35rem;
    padding-right: 0.45rem;
    padding-left: 0.45rem;
  }

  .status-bar p,
  .status-bar time {
    font-size: 0.7rem;
  }

  .difficulty-control {
    gap: 0.3rem;
    font-size: 0.7rem;
  }

  .difficulty-control select {
    padding-right: 1.3rem;
  }

  .action-button {
    padding-right: 0.3rem;
    padding-left: 0.3rem;
    font-size: 0.7rem;
  }

  .number-button {
    min-height: 2.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}