body {
  background: #111;
  color: white;
  font-family: Arial;
  padding: 20px 50px;
}

h1 {
  text-align: center;
}

.wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}

textarea {
  height: 450px;
  padding: 20px;
  background: #161b22;
  color: #e6edf3;
  border: 3px solid #30363d;
  border-radius: 16px;

  font-family: monospace;
  font-size: 14px;
  line-height: 1.6;

  resize: none;
  outline: none;

  transition: all 0.25s ease;

  box-shadow:
    inset 0 1px 3px rgba(0, 0, 0, 0.35),
    0 4px 12px rgba(0, 0, 0, 0.15);
}

textarea::placeholder {
  color: #7d8590;
}

textarea:focus {
  border-color: #00ff99;
  box-shadow:
    0 0 0 3px rgba(0, 255, 153, 0.12),
    inset 0 1px 3px rgba(0, 0, 0, 0.35);
}

button {
  margin-top: 20px;
  width: 100%;
  padding: 16px 24px;

  background: linear-gradient(135deg, #067107, #008cff);
  color: #0f172a;

  border: none;
  border-radius: 14px;

  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.3px;

  cursor: pointer;
  transition: all 0.25s ease;

  box-shadow:
    0 6px 20px rgba(0, 255, 153, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

button:hover {
  transform: translateY(-2px);
  box-shadow:
    0 10px 28px rgba(0, 255, 153, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

button:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(0, 255, 153, 0.2);
}

button:focus {
  outline: none;
  box-shadow:
    0 0 0 3px rgba(0, 255, 153, 0.25),
    0 6px 20px rgba(0, 255, 153, 0.25);
}

/* ============================================
MOBILE version
============================================ */
@media (max-width: 768px) {
  body {
    padding: 15px;
  }

  h1 {
    font-size: 24px;
    margin-bottom: 20px;
  }

  .wrapper {
    grid-template-columns: 1fr;
    gap: 15px;
    margin-top: 20px;
  }

  textarea {
    height: 280px;
    padding: 15px;
    font-size: 13px;
    border-radius: 12px;
  }

  button {
    padding: 14px 20px;
    font-size: 16px;
    border-radius: 12px;
    margin-top: 15px;
  }
}