#jogo-puzzle { max-width: 500px; }
.puzzle-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    width: 100%;
    max-width: 400px;
    border: 3px solid var(--cor-titulo);
    background-color: var(--cor-titulo);
    gap: 3px;
    margin-bottom: 2rem;
}
.puzzle-cell {
    aspect-ratio: 1 / 1;
    background-color: var(--cor-painel);
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--cor-principal-acao);
    cursor: pointer;
    border: 1px solid transparent;
    transition: border-color 0.2s;
}
.puzzle-cell.active {
    border-color: var(--cor-destaque);
    box-shadow: 0 0 15px var(--cor-destaque);
    z-index: 5;
}
.puzzle-cell .clue {
    position: absolute;
    top: 2px;
    left: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--cor-texto);
}
.puzzle-cell.incorrect-cage, .puzzle-cell.incorrect-line {
    background-color: #ffebee;
    color: var(--cor-erro);
}
body.dark-mode .puzzle-cell.incorrect-cage, body.dark-mode .puzzle-cell.incorrect-line {
    background-color: #4a2525;
}
.border-top { border-top: 3px solid var(--cor-titulo); }
.border-right { border-right: 3px solid var(--cor-titulo); }
.border-bottom { border-bottom: 3px solid var(--cor-titulo); }
.border-left { border-left: 3px solid var(--cor-titulo); }
.puzzle-palette {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.palette-btn {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    font-weight: 600;
    border: 1px solid var(--cor-borda);
    border-radius: 8px;
    cursor: pointer;
    background-color: #fff;
    box-shadow: 0 2px 4px var(--cor-sombra);
}
.puzzle-controls { display: flex; gap: 1rem; }
.puzzle-message { margin-top: 1rem; font-size: 1.5rem; font-weight: 600; min-height: 30px; }