/* ── Sudoku Menu ── */
.sudoku-menu {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px 16px 32px;
  min-height: 100vh;
  max-width: 480px;
  margin: 0 auto;
}

.sudoku-menu__header {
  text-align: center;
  padding: 12px 0 4px;
}

.sudoku-menu__icon {
  font-size: 52px;
  line-height: 1;
  margin-bottom: 8px;
}

.sudoku-menu__title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.sudoku-menu__subtitle {
  font-size: 14px;
  color: var(--text-muted);
}

/* ── Continue card ── */
.sudoku-continue-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  padding: 14px 16px;
  gap: 12px;
}

.sudoku-continue-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.sudoku-continue-time {
  font-size: 15px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* ── Difficulty grid ── */
.sudoku-difficulty-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.sudoku-diff-card {
  background: var(--bg-surface);
  border: 2px solid transparent;
  border-radius: 16px;
  padding: 14px 12px;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s;
  position: relative;
  overflow: hidden;
}

.sudoku-diff-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.08;
  border-radius: 14px;
}

.sudoku-diff-card--easy::before   { background: #2DD4BF; }
.sudoku-diff-card--medium::before { background: #FBBF24; }
.sudoku-diff-card--hard::before   { background: #F97316; }
.sudoku-diff-card--expert::before { background: #EF4444; }

.sudoku-diff-card.selected {
  border-color: var(--accent-primary);
  transform: scale(1.02);
}

.sudoku-diff-card:active { transform: scale(0.97); }

.sudoku-diff-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.sudoku-diff-clues {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.sudoku-diff-best {
  font-size: 13px;
  color: var(--accent-primary);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.sudoku-diff-reward {
  font-size: 12px;
  color: #FBBF24;
  font-weight: 700;
  margin-top: 2px;
}

.sudoku-menu__balance {
  text-align: center;
  font-size: 20px;
  font-weight: 800;
  color: #FBBF24;
  background: rgba(251,191,36,0.1);
  border-radius: 20px;
  padding: 8px 20px;
  align-self: center;
}

/* ── Diff badge ── */
.sudoku-diff-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  color: #0A0E1A;
}

.sudoku-diff-badge--easy   { background: #2DD4BF; }
.sudoku-diff-badge--medium { background: #FBBF24; }
.sudoku-diff-badge--hard   { background: #F97316; }
.sudoku-diff-badge--expert { background: #EF4444; }

/* ── Buttons ── */
.sudoku-btn {
  border: none;
  border-radius: 14px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.sudoku-btn:active { transform: scale(0.97); opacity: 0.85; }

.sudoku-btn--primary {
  background: var(--accent-primary);
  color: #fff;
}

.sudoku-btn--accent {
  background: var(--accent-primary);
  color: #fff;
}

.sudoku-btn--ghost {
  background: var(--bg-elevated);
  color: var(--text-secondary);
}

.sudoku-btn--full {
  width: 100%;
  display: block;
}

/* ── Loader ── */
.sudoku-loader {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 48px;
  background: var(--bg-deepest);
  z-index: 200;
  animation: pulse 1s infinite;
}

/* ── Play screen ── */
.sudoku-play {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 12px 12px calc(24px + env(safe-area-inset-bottom));
  min-height: 100vh;
  max-width: 480px;
  margin: 0 auto;
}

/* ── Topbar ── */
.sudoku-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0 4px;
}

.sudoku-timer {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.sudoku-icon-btn {
  background: var(--bg-elevated);
  border: none;
  border-radius: 10px;
  width: 38px;
  height: 38px;
  font-size: 18px;
  cursor: pointer;
  color: var(--text-secondary);
  display: grid;
  place-items: center;
}

/* ── Meta row ── */
.sudoku-meta-row {
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 0 4px;
}

.sudoku-meta-item {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
}

.sudoku-meta-coins {
  color: #FBBF24;
  font-weight: 700;
}

/* ── Board ── */
.sudoku-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  width: min(92vw, 420px);
  aspect-ratio: 1 / 1;
  background: var(--bg-surface);
  border-radius: 12px;
  border: 2px solid var(--border-glass);
  overflow: hidden;
  flex-shrink: 0;
}

.sudoku-cell {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  background: var(--bg-deep);
  border: 1px solid rgba(255,255,255,0.06);
  font-size: clamp(16px, 4.5vw, 22px);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0;
  transition: background 0.1s;
  position: relative;
  overflow: hidden;
}

.sudoku-cell.box-border-right  { border-right:  2px solid rgba(255,255,255,0.2); }
.sudoku-cell.box-border-bottom { border-bottom: 2px solid rgba(255,255,255,0.2); }

.sudoku-cell.given {
  color: var(--text-primary);
  font-weight: 800;
  background: var(--bg-surface);
}

.sudoku-cell.user  { color: var(--accent-primary); }

.sudoku-cell.selected {
  background: rgba(124,106,239,0.25);
  outline: 2px solid var(--accent-primary);
  outline-offset: -2px;
  z-index: 1;
}

.sudoku-cell.highlight-peer  { background: var(--bg-elevated); }
.sudoku-cell.highlight-same  { background: rgba(124,106,239,0.15); }

.sudoku-cell.conflict {
  color: #FF6B6B;
  animation: shake 0.3s ease;
}

/* ── Notes grid ── */
.sudoku-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  padding: 1px;
}

.sudoku-note-cell {
  font-size: clamp(7px, 1.6vw, 9px);
  color: var(--text-muted);
  display: grid;
  place-items: center;
  line-height: 1;
}

/* ── Numpad ── */
.sudoku-numpad {
  width: min(92vw, 420px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sudoku-numpad-row {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 4px;
}

.sudoku-num-btn {
  aspect-ratio: 1 / 1;
  background: var(--bg-surface);
  border: none;
  border-radius: 10px;
  font-size: clamp(16px, 4vw, 22px);
  font-weight: 800;
  color: var(--accent-primary);
  cursor: pointer;
  position: relative;
  transition: transform 0.1s, opacity 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sudoku-num-btn:disabled {
  opacity: 0.25;
  pointer-events: none;
}

.sudoku-num-btn:active { transform: scale(0.9); }

.sudoku-num-badge {
  position: absolute;
  top: 2px;
  right: 3px;
  font-size: 8px;
  font-weight: 700;
  color: var(--text-muted);
  line-height: 1;
}

/* ── Tools ── */
.sudoku-tools {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.sudoku-tool-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 4px;
  background: var(--bg-surface);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.sudoku-tool-btn.active {
  background: rgba(124,106,239,0.18);
  color: var(--accent-primary);
}

.sudoku-tool-btn:active { opacity: 0.7; }

.sudoku-tool-icon {
  font-size: 20px;
  line-height: 1;
}

.sudoku-tool-label {
  font-size: 10px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.sudoku-tool-btn.active .sudoku-tool-label { color: var(--accent-primary); }

.sudoku-tool-btn.hint-paid .sudoku-tool-label,
.sudoku-tool-btn.tool-paid .sudoku-tool-label {
  color: #FBBF24;
  font-weight: 700;
}

/* ── Modal ── */
.sudoku-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: grid;
  place-items: center;
  z-index: 300;
  padding: 20px;
}

.sudoku-modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  padding: 24px 20px;
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: center;
}

.sudoku-modal__icon {
  font-size: 44px;
  line-height: 1;
}

.sudoku-modal__title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}

.sudoku-modal__desc {
  font-size: 14px;
  color: var(--text-muted);
}

.sudoku-modal__time {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent-primary);
  font-variant-numeric: tabular-nums;
}

.sudoku-modal__btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
}

/* ── Win screen ── */
.sudoku-win {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 24px 16px 40px;
  min-height: 100vh;
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.sudoku-win__icon {
  font-size: 64px;
  line-height: 1;
  animation: bounce 0.6s ease;
}

.sudoku-win__title {
  font-size: 30px;
  font-weight: 900;
  color: var(--text-primary);
}

.sudoku-win__subtitle {
  font-size: 16px;
  color: var(--text-muted);
}

.sudoku-win__record {
  background: linear-gradient(135deg, #F59E0B, #EF4444);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
  padding: 8px 20px;
  border-radius: 20px;
  animation: pulse 1.5s infinite;
}

.sudoku-win__stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  width: 100%;
}

.sudoku-win__stat {
  background: var(--bg-surface);
  border-radius: 14px;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.sudoku-win__stat-label {
  font-size: 11px;
  color: var(--text-muted);
}

.sudoku-win__stat-value {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
}

.sudoku-win__reward-banner {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.sudoku-win__reward-chip {
  padding: 10px 22px;
  border-radius: 20px;
  font-size: 18px;
  font-weight: 800;
  animation: bounce 0.6s ease;
}

.sudoku-win__reward-chip--xp {
  background: linear-gradient(135deg, #7C6AEF, #38BDF8);
  color: #fff;
}

.sudoku-win__reward-chip--coins {
  background: linear-gradient(135deg, #F59E0B, #FBBF24);
  color: #0A0E1A;
}

.sudoku-win__balance {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 600;
}

.sudoku-win__btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  margin-top: 8px;
}

/* ── Animations ── */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-4px); }
  75%       { transform: translateX(4px); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  40%       { transform: translateY(-16px); }
  60%       { transform: translateY(-8px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.7; }
}