html {
  box-sizing: border-box;
  font-size: 16px;
}
*, *:before, *:after {
  box-sizing: inherit;
}

body {
  background: #fae3d9;
  font-family: Arial, sans-serif;
  text-align: center;
  color: #22223b;
  margin: 0;
  min-height: 100vh;
}

/* Encabezado */
h1 {
  margin-top: 2rem;
  color: #9a8c98;
  font-size: clamp(1.5rem, 5vw, 2.7rem);
}

/* Score y timer flexibles */
#score, #timer {
  font-size: clamp(1em, 2vw, 1.18em);
  margin-bottom: 0.8em;
}

/* Tablero de celdas adaptativo y cuadrado */
#grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 1em;
  justify-content: center;
  margin: 1.6em auto 0.8em auto;
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1/1;
  background: #f5ebe3;
  border-radius: 1.2em;
  padding: 1em;
  box-shadow: 0 2px 10px #bbb7;
}

/* Celdas circulares */
.cell {
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 2px 10px #bbb;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.5em, 6vw, 2.4em);
  cursor: pointer;
  transition: background 0.2s;
  min-width: 0;
  min-height: 0;
  aspect-ratio: 1/1;
}
.cell.mole {
  background: #b5838d;
}

/* Botón start flexible */
#start-btn {
  background: #9a8c98;
  color: #fff;
  font-size: clamp(1em, 2vw, 1.18em);
  border: none;
  border-radius: 0.6em;
  padding: 0.6em 2em;
  cursor: pointer;
  box-shadow: 0 2px 8px #b5838d44;
  transition: background 0.2s;
  margin-bottom: 1.3em;
}
#start-btn:hover, #start-btn:active {
  background: #22223b;
  color: #fff;
}

/* Mensaje final */
#end-message {
  font-size: clamp(1em, 2vw, 1.15em);
  margin-top: 1.1em;
  min-height: 2em;
  color: #b5838d;
}

/* ==== Pantallas móviles ==== */
@media (max-width: 600px) {
  h1 {
    margin-top: 6vw;
    font-size: clamp(1.1em, 7vw, 2.1em);
  }
  #grid {
    max-width: 97vw;
    gap: 4vw;
    padding: 2vw;
    border-radius: 7vw;
    margin-top: 6vw;
    margin-bottom: 6vw;
  }
  .cell {
    font-size: clamp(1.1em, 10vw, 2.8em);
    border-radius: 50%;
  }
  #start-btn {
    font-size: clamp(1em, 8vw, 1.5em);
    padding: 1em 13vw;
    border-radius: 5vw;
    margin-bottom: 6vw;
  }
  #score, #timer {
    font-size: clamp(1em, 7vw, 1.3em);
    margin-bottom: 3vw;
  }
  #end-message {
    font-size: clamp(1em, 7vw, 1.3em);
    margin-top: 5vw;
  }
}

/* ==== Pantallas muy pequeñas ==== */
@media (max-width: 350px) {
  #grid {
    max-width: 92vw;
    gap: 2vw;
    border-radius: 13vw;
    padding: 1vw;
  }
  .cell {
    font-size: clamp(0.8em, 12vw, 1.2em);
  }
  #start-btn {
    font-size: clamp(0.9em, 10vw, 1.1em);
    padding: 0.7em 3vw;
    border-radius: 8vw;
  }
}