/* Three's a Crowd — dragons vs. knights binary logic puzzle. */

:root {
  --tac-bg-1: #241213;
  --tac-bg-2: #150b12;
  --tac-parchment: #f3e6c8;
  --tac-parchment-soft: #d9c79f;
  --tac-gold: #d4af37;
  --tac-gold-soft: rgba(212, 175, 55, 0.35);
  --tac-dragon: #b32424;
  --tac-dragon-soft: rgba(179, 36, 36, 0.22);
  --tac-knight: #3a6ea5;
  --tac-knight-soft: rgba(58, 110, 165, 0.22);
  --tac-error: #ff5c5c;
  --font-sans: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica,
    Arial, sans-serif;
}

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

.tac-body {
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  background: radial-gradient(ellipse at 50% 0%, #5358a1 0%, #393d6b 45%,  #000000 100%);
  background-attachment: fixed;
  color: var(--tac-parchment);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  display: flex;
  justify-content: center;
  padding: clamp(1rem, 4vmin, 3rem);
}

.tac {
  width: 100%;
  max-width: 40rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  animation: tac-rise 0.6s ease-out both;
}

@keyframes tac-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

.tac__header {
  max-width: 34rem;
}

.tac__logo {
  display: block;
  width: min(28vw, 5.5rem);
  height: auto;
  margin: 0 auto 0.75rem;
}

.tac__eyebrow {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--tac-parchment);
}

.tac__title {
  margin: 0.5rem 0 0;
  font-size: clamp(1.75rem, 5vmin, 2.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-wrap: balance;
}

.tac__tagline {
  margin: 0.75rem 0 0;
  color: var(--tac-parchment-soft);
  font-size: clamp(0.875rem, 2vmin, 1.0625rem);
  line-height: 1.6;
  text-wrap: balance;
}

.tac__rules {
  margin-top: 1.5rem;
  width: 100%;
}

.tac__rules-list {
  list-style: none;
  margin: 0;
  padding: 0.9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: left;
  font-size: 0.875rem;
  color: var(--tac-parchment-soft);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--tac-gold-soft);
  border-radius: 0.75rem;
}

.tac__rules-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.tac__rule-icon {
  flex: none;
}

.tac__toolbar {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.tac__size {
  display: inline-flex;
  border: 1px solid var(--tac-gold-soft);
  border-radius: 0.6rem;
  overflow: hidden;
}

.tac__size-btn {
  padding: 0.55rem 0.9rem;
  border: 0;
  background: transparent;
  color: var(--tac-parchment-soft);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.tac__size-btn + .tac__size-btn {
  border-left: 1px solid var(--tac-gold-soft);
}

.tac__size-btn[aria-pressed="true"] {
  background: var(--tac-gold);
  color: #241213;
}

.tac__btn {
  padding: 0.55rem 1.1rem;
  border-radius: 0.6rem;
  border: 1px solid var(--tac-gold-soft);
  background: rgba(0, 0, 0, 0.25);
  color: var(--tac-parchment);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.15s ease;
}

.tac__btn:hover,
.tac__btn:focus-visible {
  background: rgba(212, 175, 55, 0.18);
}

.tac__btn:active {
  transform: translateY(1px);
}

.tac__btn--primary {
  background: var(--tac-gold);
  color: #241213;
  border-color: var(--tac-gold);
}

.tac__btn--primary:hover,
.tac__btn--primary:focus-visible {
  background: #e4c25a;
}

.tac__status {
  margin: 1.25rem 0 0;
  min-height: 1.5em;
  font-weight: 600;
  color: var(--tac-parchment-soft);
}

.tac__status--good {
  color: #7bd88f;
}

.tac__status--bad {
  color: var(--tac-error);
}

.tac__board-wrap {
  margin-top: 1rem;
  width: 100%;
  display: flex;
  justify-content: center;
}

.tac__board {
  --tac-size: 8;
  display: grid;
  grid-template-columns: repeat(var(--tac-size), 1fr);
  gap: 3px;
  width: min(100%, 34rem);
  aspect-ratio: 1 / 1;
  padding: 6px;
  background: linear-gradient(135deg, #4a2224, #2a1416);
  border-radius: 0.75rem;
  border: 2px solid var(--tac-gold);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

.tac__cell {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--tac-parchment);
  border: 1px solid rgba(36, 18, 19, 0.15);
  border-radius: 0.3rem;
  font-size: clamp(0.9rem, 3.4vw, 1.6rem);
  line-height: 1;
  cursor: pointer;
  padding: 0;
  aspect-ratio: 1 / 1;
  transition: background-color 0.12s ease, transform 0.06s ease;
}

.tac__cell:hover:not(:disabled) {
  background: #fff8e6;
}

.tac__cell:active:not(:disabled) {
  transform: scale(0.94);
}

.tac__cell:disabled {
  cursor: default;
}

.tac__cell--clue {
  background: var(--tac-parchment-soft);
  font-weight: 700;
}

.tac__cell--dragon {
  background: var(--tac-dragon-soft);
}

.tac__cell--clue.tac__cell--dragon {
  background: var(--tac-dragon-soft);
  box-shadow: inset 0 0 0 2px var(--tac-dragon);
}

.tac__cell--knight {
  background: var(--tac-knight-soft);
}

.tac__cell--clue.tac__cell--knight {
  background: var(--tac-knight-soft);
  box-shadow: inset 0 0 0 2px var(--tac-knight);
}

.tac__cell--error {
  box-shadow: inset 0 0 0 2px var(--tac-error);
}

.tac__hint {
  margin: 1rem 0 0;
  max-width: 32rem;
  color: var(--tac-parchment-soft);
  font-size: 0.8125rem;
  line-height: 1.6;
}

.tac__legend-dragon {
  color: #ff8a8a;
  font-weight: 600;
}

.tac__legend-knight {
  color: #9dc4ea;
  font-weight: 600;
}

.tac__back {
  margin-top: 1.75rem;
}

.tac__back-link {
  color: var(--tac-gold);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.tac__back-link:hover,
.tac__back-link:focus-visible {
  text-decoration: underline;
}

@media (prefers-reduced-motion: reduce) {
  .tac {
    animation: none;
  }
}