@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600&display=swap');

body {
  margin: 0;
  padding: 0;
  font-family: 'Nunito', sans-serif;
  background: #f2f2f7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  color: #111827;
}

.top-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-top: 20px;
}

.top-bar span {
  font-size: 1.2rem;
  font-weight: bold;
}

.top-bar button,
.top-bar select {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: none;
  background-color: #137fd9;
  color: white;
  cursor: pointer;
}

.top-bar button:hover,
.top-bar select:hover {
  background-color: #0d5fa7;
}

.game-container {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 1rem;
  margin-top: 20px;
}

#grid {
  width: 450px;
  height: 450px;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  background: white;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.25);
  border-radius: 8px;
}

.cell {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
  border: 1px solid rgba(0, 0, 0, 0.4);
  cursor: pointer;
  user-select: none;
}

.cell-bottom-border {
  border-bottom: 3px solid black;
}

.cell-right-border {
  border-right: 3px solid black;
}

#selection {
  height: 450px;
  width: 60px;
}

.digit {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
  width: 100%;
  height: 48px;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, 0.4);
  cursor: pointer;
  user-select: none;
  transition: 0.2s;
}

.digit:hover {
  background-color: #d0e7fa;
}

.selected-digit {
  background-color: #137fd9;
  color: white;
}

.correct-digit {
  background-color: #22c55e;
  color: white;
}

.wrong-digit {
  background-color: #ef4444;
  color: white;
}

h1 {
  margin-bottom: 0;
}

#mistakes {
  position: absolute;
  top: 30%;
  right: 50%;
  transform: translateX(50%);
  z-index: 2000;
  text-align: center;
  font-weight: bold;
  color: red;
  opacity: 0;
  transition: opacity 0.5s ease;
  font-size: 3rem;
  pointer-events: none;
}

#popupInstrucoes {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

#popupInstrucoes .conteudo {
  background: white;
  border-radius: 15px;
  padding: 25px;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  color: #111827;
}

#popupInstrucoes button {
  background: #137fd9;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  margin-top: 15px;
  cursor: pointer;
  font-weight: bold;
}

#popupInstrucoes button:hover {
  background: #0d5fa7;
}

#game-over {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 2rem;
  border-radius: 1rem;
  text-align: center;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

#game-over button {
  margin: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
}

#game-over button#restart {
  background-color: #28a745;
  color: white;
}

#game-over button#restart:hover {
  background-color: #218838;
}

#game-over button#exit {
  background-color: #dc3545;
  color: white;
}

#game-over button#exit:hover {
  background-color: #c82333;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #111827;
    color: #e6edf3;
  }

  #grid {
    background: #111827;
  }

  .digit:hover {
    background-color: #045b9c;
  }

  .selected-digit {
    background-color: #045b9c;
    color: white;
  }

  #popupInstrucoes .conteudo {
    background: #0f1724;
    color: #e6edf3;
  }
}

@media (max-width: 1440px) {
  #grid {
    width: 420px;
    height: 420px;
  }
  #selection {
    height: 420px;
    width: 55px;
  }
}

@media (max-width: 1024px) {
  #grid {
    width: 380px;
    height: 380px;
  }
  #selection {
    height: 380px;
    width: 50px;
  }
}

@media (max-width: 768px) {
  #grid {
    width: 320px;
    height: 320px;
  }
  #selection {
    height: 320px;
    width: 45px;
  }
}

@media (max-width: 480px) {
  #grid {
    width: 260px;
    height: 260px;
  }
  #selection {
    height: 260px;
    width: 40px;
  }
}