* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #121214;
  color: #eee;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 15px;
}
.container {
  background: #1f2937;
  border-radius: 10px;
  padding: 5px 25px;
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: 0 0 15px #2563ebaa;
  margin: auto;
  flex-grow: 0.5;
}
h1 {
  margin-bottom: 15px;
  font-weight: 700;
  font-size: 2rem;
  color: #60a5fa;
}
p.tipo-chave {
  font-weight: 600;
  margin-bottom: 25px;
  font-size: 1.1rem;
}
button {
  width: 100%;
  background: #2563eb;
  color: white;
  border: none;
  padding: 14px 0;
  font-size: 1.3rem;
  font-weight: 700;
  border-radius: 12px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  box-shadow: 0 0 10px #2563eb;
  margin-bottom: 20px;
}
button:hover {
  background: #1e40af;
  box-shadow: 0 0 16px #1e40af;
}
#qrcode {
  margin: 0 auto;
  background: white;
  padding: 0;
  border-radius: 12px;
  width: 40px;
  height: 40px;
  overflow: hidden;
  transition: width 0.6s ease, height 0.6s ease, padding 0.6s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}
#qrcode.expanded {
  width: 250px;
  height: 250px;
  padding: 15px;
}
#pixcode {
  margin: 20px auto 0;
  font-family: monospace;
  background: #475569;
  padding: 12px 12px;
  border-radius: 12px;
  word-break: break-word;
  cursor: pointer;
  user-select: all;
  transition: background-color 0.3s ease;
  max-width: 380px;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.5s ease, max-height 0.5s ease;
}
#pixcode.visible {
  opacity: 1;
  max-height: 200px;
}
#pixcode:hover {
  background: #60a5fa;
  color: #0f172a;
}
footer {
  margin-top: auto;
  padding: 20px 0;
  text-align: center;
  font-size: 0.9rem;
  color: #94a3b8;
  background: #1f2937;
  border-radius: 12px 12px 0 0;
}
footer a {
  margin: 0 10px;
  color: #60a5fa;
  text-decoration: none;
  vertical-align: middle;
}
footer a img {
  width: 24px;
  height: 24px;
  vertical-align: middle;
  filter: brightness(0) invert(1);
  transition: filter 0.3s ease;
}
footer a:hover img {
  filter: brightness(0) invert(0.6);
}