* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  margin: 0;
  padding: 0;
  color: #222;
  background: #f5f5f5;
}

header {
  background: #2c3e50;
  color: #fff;
  padding: 16px 24px;
}

header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

section {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 20px;
}

h2 {
  margin-top: 0;
  font-size: 17px;
}

.hint {
  color: #666;
  font-size: 14px;
}

button {
  font-size: 14px;
  padding: 8px 16px;
  margin-right: 8px;
  border: 1px solid #2c3e50;
  border-radius: 4px;
  background: #2c3e50;
  color: #fff;
  cursor: pointer;
}

button:disabled {
  background: #aaa;
  border-color: #aaa;
  cursor: not-allowed;
}

button#btn-reset {
  background: #fff;
  color: #2c3e50;
}

@media print {
  header, #form-section, button { display: none !important; }
  main { max-width: none; padding: 0; }
  section { border: none; padding: 0; }
}