:root {
  --bg-color: #fff;
  --text-color: #333;
  --text-muted: #666;
  --text-muted-light: #555;
  --input-bg: #fff;
  --input-border: #ccc;
  --btn-print-bg: #820ad1;
  --btn-print-hover-bg: #6e08b3;
  --btn-reset-bg: #666;
  --btn-reset-hover-bg: #444;
  --footer-link-color: #820ad1;
  --footer-link-hover: #6e08b3;
  --card-bg: #fff;
  --card-border: #ccc;
  --qr-bg: #fff;
  --qr-border: #820ad1;
  --info-title-color: #333;
  --pix-line-color: #000;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --text-muted: #999;
    --text-muted-light: #bbb;
    --input-bg: #1e1e1e;
    --input-border: #333;
    --btn-print-bg: #820ad1;
    --btn-print-hover-bg: #30044e;
    --btn-reset-bg: #444;
    --btn-reset-hover-bg: #222;
    --footer-link-color: #bb86fc;
    --footer-link-hover: #9f6de9;
    --card-bg: #1e1e1e;
    --card-border: #333;
    --qr-bg: #121212;
    --qr-border: #bb86fc;
    --info-title-color: #e0e0e0;
    --pix-line-color: #ccc;
  }
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  padding: 40px 20px;
  color: var(--text-color);
  overflow-x: hidden;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 10px;
}

.footer {
  margin-top: 40px;
  padding: 16px 10px;
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
}

.footer a {
  color: var(--footer-link-color);
  text-decoration: none;
  font-weight: 600;
}

.footer a:hover {
  text-decoration: underline;
  color: var(--footer-link-hover);
}

@media (min-width: 768px) {
  .container {
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    gap: 40px;
  }
}

#form-container {
  max-width: 300px;
  width: 100%;
  text-align: left;
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 30px;
  padding: 20px;
  background-color: var(--card-bg);
  border-radius: 12px;
  box-shadow: var(--box-shadow-light);
}

#form-container label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text-color);
  font-size: 14px;
}

#form-container input[type="text"],
#form-container input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 16px;
  box-sizing: border-box;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  font-size: 15px;
  background-color: var(--input-bg);
  color: var(--text-color);
  transition: border-color 0.3s, box-shadow 0.3s;
}

#form-container input[type="text"]:focus,
#form-container input[type="number"]:focus {
  border-color: var(--btn-print-bg);
  outline: none;
  box-shadow: var(--focus-ring);
}

.card {
  width: 220px;
  padding: 10px;
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  box-sizing: border-box;
  text-align: center;
}

.btn {
  width: 100%;
  padding: 8px;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 600;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn-print {
  background-color: var(--btn-print-bg);
}

.btn-print:hover {
  background-color: var(--btn-print-hover-bg);
}

.btn-reset {
  background-color: var(--btn-reset-bg);
}

.btn-reset:hover {
  background-color: var(--btn-reset-hover-bg);
}

#qr-container {
  width: 180px;
  height: 180px;
  margin: 0 auto;
  padding: 2px;
  border-radius: 2px;
  background-color: var(--qr-bg);
  border: 2px solid var(--qr-border);
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
}

#qrcode {
  display: flex;
  align-items: center;
  justify-content: center;
}

#qrcode img {
  width: 100%;
  height: auto;
}

.info {
  margin-top: 10px;
  font-size: 13px;
}

.info h2 {
  font-size: 17px;
  margin-bottom: 6px;
  color: var(--info-title-color);
}

.pix-line {
  font-size: 11px;
  padding: 0 4px;
  word-break: break-word;
  display: flex;
  justify-content: space-between;
  color: var(--pix-line-color);
}

@media (max-width: 480px) {
  .info h2 {
    font-size: 14px;
  }
  .btn {
    font-size: 12px;
    padding: 6px;
  }
}

@media print {
  #form-container,
  .footer {
    display: none !important;
  }
}