/* Estilo general */
body {
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  background: #f6f9fc;
  color: #222;
  margin: 0;
  padding: 0;
}

header {
  background: linear-gradient(90deg, #f38020, #faad47);
  color: white;
  padding: 25px 40px;
}

header h1 {
  margin: 0;
  font-size: 1.8em;
}

header p {
  max-width: 800px;
  margin-top: 10px;
  line-height: 1.5em;
}

/* Contenido principal */
main {
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.calculator, .explanation {
  background: white;
  padding: 25px 30px;
  margin-bottom: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  width: 100%;
  max-width: 700px;
}

h2 {
  color: #f38020;
  margin-top: 0;
}

/* Formularios */
label {
  display: block;
  margin-top: 15px;
  font-weight: 600;
}

input, select {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border-radius: 5px;
  border: 1px solid #ccc;
  font-size: 1em;
}

button {
  margin-top: 20px;
  padding: 12px 20px;
  background: #f38020;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1em;
  transition: background 0.2s ease-in-out;
}

button:hover {
  background: #e86b00;
}

/* Resultado */
#resultado {
  margin-top: 25px;
  background: #f8f9fa;
  border-radius: 8px;
  padding: 15px;
  border-left: 4px solid #f38020;
  font-size: 1.1em;
}

.explanation ul {
  margin-left: 20px;
}

.explanation li {
  margin-bottom: 10px;
  line-height: 1.5em;
}

blockquote {
  margin-top: 20px;
  padding: 15px;
  background: #f6f9fc;
  border-left: 4px solid #f38020;
  font-style: italic;
}

footer {
  background: #20232a;
  color: white;
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
}
canvas {
  display: block;
  margin: 0 auto;
}

.explicacion-roi {
  margin-top: 20px;
  background: #f9fafb;
  padding: 20px;
  border-radius: 10px;
  border-left: 4px solid #f38020;
  color: #333;
}

.explicacion-roi h3 {
  color: #f38020;
  margin-top: 0;
}