/* Guided first-Sudoku widget: /how-to-play/first-puzzle/ */
.fp [hidden] { display: none !important; }
.fp {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--sp-4);
  max-width: 560px;
  margin: 0 auto var(--sp-6);
}
body.fp-embed {
  margin: 0;
  background: var(--bg, transparent);
}
body.fp-embed .fp {
  border: none;
  padding: var(--sp-3);
  max-width: none;
  margin: 0;
  background: var(--bg, transparent);
}

.fp-progress {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}
.fp-progress-bar {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}
.fp-progress-fill {
  height: 100%;
  width: 0;
  background: var(--brand);
  border-radius: 999px;
  transition: width .25s ease;
}
.fp-progress-text {
  font-size: 13px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.fp-board {
  display: flex;
  justify-content: center;
  margin-bottom: var(--sp-4);
}
.fp-grid {
  max-width: 440px;
}
@media (max-width: 760px) {
  .fp-grid { max-width: min(92vw, 400px); }
}

.fp-cell {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: clamp(16px, 3.6vw, 24px);
  line-height: 1;
  color: var(--ink);
}
.fp-cell.sel { box-shadow: inset 0 0 0 2px var(--brand); }
.fp-cell.unit { background: color-mix(in srgb, var(--brand) 8%, transparent); }
.fp-cell.target {
  background: color-mix(in srgb, var(--warn, #D97706) 22%, transparent);
  box-shadow: inset 0 0 0 2px var(--warn, #D97706);
  z-index: 1;
}
@media (prefers-reduced-motion: no-preference) {
  .fp-cell.bad { animation: fp-shake .3s ease; }
  .fp-cell.flash { animation: fp-flash .9s ease; }
}
@keyframes fp-shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}
@keyframes fp-flash {
  0%, 100% { background: transparent; }
  30% { background: color-mix(in srgb, var(--warn, #D97706) 35%, transparent); }
}

.fp-prompt {
  margin: var(--sp-3) 0;
  min-height: 3.2em;
}
.fp-say {
  font-size: 15.5px;
  line-height: 1.5;
  margin: 0 0 4px;
}
.fp-why {
  font-size: 13.5px;
  color: var(--ink-2);
  margin: 0;
  min-height: 1.3em;
}
.fp-say a, .fp-why a { color: var(--brand); }

.fp-pad {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
  margin-bottom: var(--sp-3);
}
.fp-num {
  min-height: 48px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--r-sm);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  cursor: pointer;
}
.fp-num:hover { border-color: var(--brand); color: var(--brand); }
.fp-num.done { opacity: .4; pointer-events: none; }

.fp-next-wrap { margin-bottom: var(--sp-3); }
.fp-next-wrap .tdemo-btn { width: 100%; }

.fp-actions {
  display: flex;
  gap: var(--sp-3);
}
.fp-actions .tdemo-btn { flex: 1; }

.fp-done {
  text-align: center;
  padding-top: var(--sp-4);
}
.fp-done h2 {
  font-family: var(--font-display);
  font-size: 22px;
  margin: 0 0 var(--sp-2);
}
.fp-done-stats {
  color: var(--ink-2);
  font-size: 14px;
  margin: 0 0 var(--sp-4);
}
.fp-done-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: center;
  margin-bottom: var(--sp-3);
}
.fp-again {
  background: none;
  border: none;
  color: var(--brand);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
  padding: 6px;
}

@media (max-width: 760px) {
  .fp { padding: var(--sp-3); }
}