* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
  color: #333;
}
header {
  background: #0078d7;
  color: #fff;
  padding: 20px;
  text-align: center;
}
.header-img {
  position: absolute;
  top: 15px;       
  left: 15px;      
  width: 40px;     
  height: auto;
  z-index: 1000;
}
header nav {
  margin-top: 10px;
}
header nav button {
  background: #005a9e;
  color: #fff;
  border: none;
  padding: 8px 12px;
  margin: 0 5px;
  cursor: pointer;
  border-radius: 4px;
}
main {
  max-width: 600px;
  margin: 30px auto;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
h2 {
  margin-bottom: 10px;
  color: #005a9e;
}
label {
  display: block;
  margin-top: 10px;
}
input, select, button {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 4px;
}
button[type="submit"] {
  background: #0078d7;
  color: #fff;
  border: none;
  margin-top: 15px;
}
#resultado {
  margin-top: 20px;
  font-size: 1.1em;
  text-align: center;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}
th, td {
  padding: 8px;
  border: 1px solid #ddd;
  text-align: center;
}
footer {
  text-align: center;
  margin: 40px 0 -45px 0;
  font-size: 0.9em;
  color: #666;
}
#resultado button {
  background-color: #25D366; /* verde WhatsApp */
  color: white;
  border: none;
  padding: 10px 16px;
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 10px;
  transition: background-color 0.3s ease;
}
#resultado button:hover {
  background-color: #1ebe5d;
}
.menu {
  display: flex;
} 
@media (max-width: 768px) {
  .menu {
    flex-direction: column;
  }
}
body {
  overscroll-behavior: contain;
  touch-action: manipulation;
}
input, select {
  font-size: 16px; /* evita zoom automático en iOS */
}