/* ======================= */
/* RESET BÁSICO / BASE     */
/* ======================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* ======================= */
/* BODY                    */
/* ======================= */
body {
  background-color: #f5faff;
  color: #1a1a1a;
  line-height: 1.6;
}

/* ======================= */
/* NAV (BASE)              */
/* ======================= */
nav {
  background-color: #e0f0ff;
  padding: 18px 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
  align-items: center;
  position: static; /* CLAVE */
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* ======================= */
/* BRAND                   */
/* ======================= */
nav::before {
  content: "Criptoslab";
  font-size: 1.9rem;
  font-weight: 800;
  color: #0077cc;
  letter-spacing: 0.6px;
}

/* ======================= */
/* NAV LINKS               */
/* ======================= */
nav a {
  text-decoration: none;
  color: #0077cc;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 6px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

nav a:hover {
  background-color: #0077cc;
  color: #ffffff;
}

/* ======================= */
/* MAIN                    */
/* ======================= */
main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

/* ======================= */
/* ARTÍCULO                */
/* ======================= */
article h1 {
  font-size: 2.4rem;
  margin-bottom: 20px;
  color: #0077cc;
  text-align: center;
}

article h2 {
  font-size: 1.7rem;
  margin-top: 30px;
  margin-bottom: 15px;
  color: #005a99;
}

article p {
  font-size: 1.05rem;
  margin-bottom: 18px;
  line-height: 1.85;
}

article ul,
article ol {
  padding-left: 25px;
  margin-bottom: 20px;
}

article li {
  margin-bottom: 10px;
  font-size: 1.05rem;
}

/* ======================= */
/* DISCLAIMER              */
/* ======================= */
.disclaimer {
  background-color: #f0f8ff;
  border-left: 4px solid #0077cc;
  padding: 15px;
  margin-bottom: 25px;
  font-style: italic;
  border-radius: 6px;
}

/* ======================= */
/* SECCIONES               */
/* ======================= */
section {
  background-color: #ffffff;
  padding: 25px;
  margin-bottom: 35px;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

/* ======================= */
/* TABLAS                  */
/* ======================= */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

th {
  background-color: #e0f0ff;
  color: #0077cc;
  padding: 12px;
  border: 1px solid #b3d4f5;
  font-weight: 700;
}

td {
  padding: 10px;
  border: 1px solid #b3d4f5;
  text-align: center;
}

tbody tr:nth-child(odd) {
  background-color: #f4faff;
}

tbody tr:hover {
  background-color: #d9f0ff;
}

/* ======================= */
/* FOOTER                  */
/* ======================= */
footer {
  background-color: #e0f0ff;
  text-align: center;
  padding: 20px 10px;
  margin-top: 40px;
  color: #0077cc;
  font-size: 0.9rem;
}

footer a {
  color: #0077cc;
  text-decoration: none;
  margin: 0 6px;
}

footer a:hover {
  text-decoration: underline;
}

/* ======================= */
/* 📱 MOBILE FRIENDLY      */
/* ======================= */
@media (max-width: 768px) {

  nav {
    padding: 16px 12px;
  }

  nav::before {
    font-size: 1.7rem;
  }

  nav a {
    padding: 8px 14px;
    font-size: 0.95rem;
  }

  main {
    margin-top: 30px; /* YA NO EMPUJA */
    padding: 0 15px;
  }

  article h1 {
    font-size: 1.9rem;
  }

  article h2 {
    font-size: 1.4rem;
  }

  article p,
  article li {
    font-size: 0.95rem;
  }

  section {
    padding: 20px 15px;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* ======================= */
/* 📱 EXTRA SMALL          */
/* ======================= */
@media (max-width: 480px) {

  nav::before {
    font-size: 1.6rem;
  }

  nav a {
    font-size: 0.85rem;
    padding: 6px 10px;
  }

  article h1 {
    font-size: 1.7rem;
  }
}