* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #0f172a;
  color: #f8fafc;
  display: flex;
  justify-content: center;
  padding: 20px;
}

.container {
  max-width: 800px;
  width: 100%;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

.card {
  background: #1e293b;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.challenge-card {
  border-left: 5px solid #38bdf8;
}

/* Barra de Progresso */
.progress-container {
  margin-bottom: 16px;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  margin-bottom: 6px;
  color: #94a3b8;
}

.bar-background {
  width: 100%;
  height: 12px;
  background: #334155;
  border-radius: 6px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8, #4ade80);
  transition: width 0.3s ease;
}

.status-msg {
  margin-top: 10px;
  font-weight: bold;
  min-height: 24px;
}

/* Janela do Sistema */
.janela {
  border: 1px solid #475569;
  border-radius: 6px;
  overflow: hidden;
  background: #0f172a;
}

.janela-topo {
  background: #334155;
  padding: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.janela-fechar {
  color: #f87171;
  cursor: pointer;
  font-weight: bold;
}

.barra-endereco input {
  width: 100%;
  padding: 8px;
  background: #1e293b;
  border: none;
  border-bottom: 1px solid #475569;
  color: #38bdf8;
  font-family: monospace;
}

.area-arquivos {
  padding: 20px;
  min-height: 120px;
  display: flex;
  gap: 15px;
}

.item-pasta {
  padding: 10px 15px;
  background: #334155;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  border: 2px solid transparent;
}

.item-pasta.selecionado {
  border-color: #38bdf8;
  background: #1e293b;
}

textarea {
  width: 100%;
  height: 120px;
  background: #0f172a;
  color: #f8fafc;
  border: none;
  padding: 12px;
  resize: none;
  outline: none;
}

.terminal {
  background: #000000;
  color: #4ade80;
  padding: 15px;
  font-family: monospace;
  height: 120px;
}

.oculto {
  display: none !important;
}

.teclas-box {
  background: #020617;
  color: #38bdf8;
  padding: 12px;
  border-radius: 6px;
  font-family: monospace;
  font-size: 18px;
  text-align: center;
  margin-top: 8px;
}