:root {
  --cor-fundo-principal: #0a0a1a;
  --cor-fundo-secundaria: #141433;
  --cor-texto-principal: #e0e0ff;
  --cor-texto-secundaria: #a0a0c0;
  --cor-destaque: #00ffcc;
  --sombra-neon: 0 0 10px #00ffcc, 0 0 20px #00ffcc, 0 0 40px #00ffcc;
  --gradiente-botao: linear-gradient(45deg, #00b386, #00ffcc);
  --transicao-suave: all 0.3s ease-in-out;
}

body {
  font-family: 'Segoe UI', 'Roboto', sans-serif;
  background-color: var(--cor-fundo-principal);
  color: var(--cor-texto-principal);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.container {
  background: var(--cor-fundo-secundaria);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 30px 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  max-width: 600px;
  width: 100%;
  text-align: center;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--cor-destaque);
  text-shadow: 0 0 5px var(--cor-destaque);
  margin-bottom: 25px;
}

textarea {
  width: 100%;
  height: 150px;
  background-color: var(--cor-fundo-principal);
  border: 2px solid var(--cor-destaque);
  border-radius: 10px;
  color: var(--cor-texto-principal);
  padding: 15px;
  font-size: 1rem;
  resize: vertical;
  box-shadow: inset 0 0 8px rgba(0, 255, 204, 0.3);
  transition: var(--transicao-suave);
}

textarea:focus {
  outline: none;
  border-color: var(--cor-destaque);
  box-shadow: 0 0 15px rgba(0, 255, 204, 0.6);
}

#botao-palavrachave {
  background: var(--gradiente-botao);
  color: var(--cor-fundo-principal);
  border: none;
  border-radius: 8px;
  padding: 12px 25px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  margin-top: 20px;
  box-shadow: 0 5px 15px rgba(0, 255, 204, 0.4);
  transition: var(--transicao-suave);
}

#botao-palavrachave:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 255, 204, 0.6);
}

#botao-palavrachave:active {
  transform: translateY(0);
  box-shadow: 0 5px 10px rgba(0, 255, 204, 0.4);
}

#resultado-palavrachave {
  background-color: var(--cor-fundo-principal);
  border: 1px dashed var(--cor-destaque);
  border-radius: 10px;
  padding: 20px;
  margin-top: 25px;
  min-height: 50px;
  text-align: left;
  line-height: 1.6;
  font-size: 1.1rem;
  color: var(--cor-texto-secundaria);
  word-wrap: break-word;
  box-shadow: inset 0 0 8px rgba(0, 255, 204, 0.3);
  animation: resultIn 0.5s ease-out;
}

@keyframes resultIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}