*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Roboto, sans-serif;
  background-color: #f4f4f4;
  color: #2c2c2c;
  line-height: 1.8;
  margin: 0;
}

/* ── Header ─────────────────────────────────────────────── */
header {
  background-color: #0a0a0a;
  padding: 30px 20px 20px;
  border-bottom: 4px solid #e53935;
  text-align: center;
}

header h1 {
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 4px;
  margin: 0 0 15px 0;
  font-size: 1.8rem;
}

header input[type="checkbox"] {
  display: none;
}

header label {
  display: none;
  cursor: pointer;
  font-size: 1.6rem;
  color: #e53935;
  border: 2px solid #e53935;
  padding: 3px 10px;
  border-radius: 4px;
  margin: 0 auto 10px;
  user-select: none;
}

/* ── Navegación del header ───────────────────────────────── */
header nav ol {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

header nav li {
  display: inline-block;
}

header nav a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  border: 1px solid #555;
  padding: 8px 16px;
  border-radius: 4px;
  transition: background-color 0.3s, border-color 0.3s;
}

header nav a:hover {
  background-color: #e53935;
  border-color: #e53935;
}

/* ── Breadcrumb ──────────────────────────────────────────── */
body > nav {
  background: #ececec;
  padding: 8px 20px;
  font-size: 0.85rem;
  border-bottom: 1px solid #d5d5d5;
}

body > nav ol {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  align-items: center;
}

body > nav li {
  display: inline;
  color: #666;
}

body > nav li + li::before {
  content: "›";
  margin-right: 6px;
  color: #aaa;
}

body > nav a {
  color: #e53935;
  text-decoration: none;
}

body > nav a:hover {
  text-decoration: underline;
}

/* ── Main ────────────────────────────────────────────────── */
main {
  max-width: 860px;
  margin: 40px auto;
  padding: 0 20px;
}

/* ── Secciones de contenido ─────────────────────────────── */
main > section {
  background: #ffffff;
  padding: 30px 35px;
  border-radius: 10px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.07);
  margin-bottom: 28px;
  text-align: left;
  border-top: 3px solid #e53935;
}

main > section h2 {
  color: #0a0a0a;
  font-size: 1.25rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
}

main > section p {
  margin-bottom: 12px;
}

main > section ul {
  padding-left: 20px;
  margin-top: 8px;
}

main > section ul li {
  margin-bottom: 10px;
}

/* ── Tabla ───────────────────────────────────────────────── */
main > section > div {
  overflow-x: auto;
  margin-top: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
  min-width: 360px;
}

thead th {
  background-color: #e53935;
  color: #fff;
  padding: 11px 14px;
  text-align: left;
  text-transform: uppercase;
  font-size: 0.82rem;
  letter-spacing: 0.5px;
}

tbody td {
  padding: 11px 14px;
  border-bottom: 1px solid #eee;
  vertical-align: top;
}

tbody tr:nth-child(even) {
  background-color: #fafafa;
}

tbody tr:hover {
  background-color: #fff4f4;
}

/* ── Nav de suplementos relacionados (al final del main) ─── */
main > nav {
  margin-top: 10px;
  margin-bottom: 20px;
  background: #fff;
  border-radius: 10px;
  padding: 20px 30px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.07);
  text-align: left;
  border-top: 3px solid #e53935;
}

main > nav::before {
  content: "Ver también";
  display: block;
  font-weight: bold;
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

main > nav ol {
  list-style: none;
  display: flex;
  gap: 12px;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

main > nav ol li {
  display: inline-block;
}

main > nav ol a {
  text-decoration: none;
  color: #e53935;
  font-weight: bold;
  padding: 6px 16px;
  border: 2px solid #e53935;
  border-radius: 4px;
  font-size: 0.9rem;
  transition: background-color 0.25s, color 0.25s;
}

main > nav ol a:hover {
  background-color: #e53935;
  color: #fff;
}

/* ── Links dentro de secciones (tabla de índice) ─────────── */
main > section a {
  color: #c0392b;
  text-decoration: none;
  font-weight: 600;
}

main > section a:hover {
  text-decoration: underline;
}

/* ── Footer ─────────────────────────────────────────────── */
footer {
  background: #0a0a0a;
  color: #666;
  padding: 25px;
  font-size: 0.85rem;
  margin-top: 50px;
  text-align: center;
}

/* ============================================================
   MEDIA QUERY — Móvil (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {

  header label {
    display: block;
  }

  header nav {
    display: none;
    width: 100%;
  }

  header input[type="checkbox"]:checked ~ nav {
    display: block;
  }

  header nav ol {
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
  }

  header nav li {
    display: block;
    width: 100%;
    text-align: center;
  }

  header nav a {
    display: block;
    padding: 10px 20px;
  }

  header h1 {
    font-size: 1.2rem;
    letter-spacing: 2px;
  }

  main {
    padding: 0 12px;
    margin: 20px auto;
  }

  main > section {
    padding: 18px 16px;
  }

  main > nav {
    padding: 16px;
  }

  main > nav ol {
    flex-direction: column;
    gap: 10px;
  }

  main > nav ol li {
    display: block;
    width: 100%;
  }

  main > nav ol a {
    display: block;
    text-align: center;
  }

  thead th,
  tbody td {
    padding: 8px 10px;
    font-size: 0.82rem;
  }
}

/* ============================================================
   MEDIA QUERY — Tablet (481px – 768px)
   ============================================================ */
@media (min-width: 481px) and (max-width: 768px) {
  main {
    padding: 0 16px;
  }

  main > section {
    padding: 22px 20px;
  }
}