/* =============================
   RESET BÁSICO
============================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 20px;
}

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  font-size: clamp(16px, 1.1vw, 20px);
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #f0fff4, #e6f7ff);
  padding: 1rem;
}

/* =============================
   HEADER
============================= */
header {
  text-align: center;
  padding: 1.5rem 1rem;
  background: #ffffffcc;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  margin-bottom: 1rem;
}

header h1 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: #16480c; /* verde saludable */
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1rem;
  color: #555;
}

/* =============================
   MAIN CONTENT
============================= */
main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1rem;
}

h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  color: #195b1d; /* azul claro */
  margin: 1.5rem 0 0.8rem;
}

p {
  margin-bottom: 1rem;
}

ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

ul li {
  margin-bottom: 0.5rem;
}

/* Fórmulas destacadas */
.formula {
  display: block;
  background: #f9f9f9;
  padding: 0.5rem 0.8rem;
  border-left: 4px solid #2e7d32;
  font-family: monospace;
  font-size: 0.95rem;
  margin-top: 0.4rem;
}

/* =============================
   FORMULARIO
============================= */
form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: #ffffffcc;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  margin-top: 1rem;
}

label {
  font-weight: bold;
  margin-bottom: 0.3rem;
}

input, select {
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1rem;
  width: 100%;
}

input:focus, select:focus {
  outline: none;
  border-color: #2e7d32;
  box-shadow: 0 0 6px rgba(46,125,50,0.3);
}

/* Botón */
button {
  background: #2e7d32;
  color: white;
  border: none;
  padding: 0.8rem;
  font-size: 1rem;
  font-weight: bold;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #1b5e20;
}

/* =============================
   RESULTADO
============================= */
#result {
  margin-top: 2rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(6px);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  transform: translateY(15px);
}

#result.visible {
  opacity: 1;
  transform: translateY(0);
}

#result h2 {
  margin-bottom: 0.8rem;
  font-size: 1.5rem;
  font-weight: 600;
  color: #1e4d2b; /* verde elegante */
  border-bottom: 2px solid #e0e0e0;
  padding-bottom: 0.4rem;
}

#calories {
  font-size: 1rem;
  font-weight: 400;
  color: #1d7726; /* azul llamativo */
}

/* =============================
   RESPONSIVE EXTRA
============================= */
@media (max-width: 600px) {
  body {
    padding: 0.5rem;
  }

  header {
    padding: 1.2rem;
  }

  form {
    padding: 1rem;
  }
}