body {
  font-family: system-ui, 'Segoe UI', sans-serif;
  max-width: 860px;
  margin: 24px auto;
  padding: 0 16px 64px;
  color: #1a1a1a;
  line-height: 1.65;
  font-size: 16px;
}
h1 { color: #1a4731; font-size: 1.6rem; line-height: 1.3; }
h2 { font-size: 1.25rem; margin-top: 2rem; padding-bottom: 6px; border-bottom: 2px solid #e5e7eb; }
h3 { font-size: 1.08rem; margin-top: 1.2rem; }
.alumno h2 { color: #1d4ed8; border-color: #bfdbfe; }
.docente h2 { color: #2d6a4f; border-color: #bbf7d0; }
.meta { color: #555; font-size: 14px; }
.intro, .caja-verde, .caja-azul, .caja-amarilla, .caja-roja {
  padding: 14px 18px;
  border-radius: 10px;
  margin: 16px 0;
  font-size: 15px;
}
.intro { border-left: 5px solid #2d6a4f; background: #f0fdf4; }
.alumno .intro { border-color: #2563eb; background: #eff6ff; }
.caja-amarilla { background: #fffbeb; border-left: 5px solid #d97706; }
.caja-azul { background: #eff6ff; border-left: 5px solid #2563eb; }
.caja-verde { background: #ecfdf5; border-left: 5px solid #059669; }
.caja-roja { background: #fef2f2; border-left: 5px solid #dc2626; }
.paso {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 14px 16px;
  margin: 12px 0;
}
.paso-num {
  display: inline-block;
  background: #1a4731;
  color: #fff;
  font-weight: 700;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  margin-right: 8px;
  font-size: 14px;
}
.alumno .paso-num { background: #2563eb; }
.pantalla {
  background: #f9fafb;
  border: 1px dashed #9ca3af;
  padding: 10px 14px;
  border-radius: 8px;
  margin: 10px 0;
  font-size: 14px;
}
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 12px 0; }
th, td { border: 1px solid #d1d5db; padding: 10px; text-align: left; vertical-align: top; }
th { background: #f3f4f6; }
code { background: #f3f4f6; padding: 2px 8px; border-radius: 4px; font-size: 14px; }
details {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  margin: 10px 0;
  padding: 0 14px 10px;
  background: #fafafa;
}
summary {
  cursor: pointer;
  font-weight: 600;
  padding: 12px 4px;
  font-size: 15px;
}
details[open] summary { margin-bottom: 8px; }
.toc { background: #f9fafb; padding: 14px 18px; border-radius: 10px; font-size: 14px; line-height: 1.8; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
ul.check li { list-style: none; margin: 8px 0; }
ul.check li::before { content: "☐ "; font-weight: bold; }
.ejemplo { font-style: italic; color: #374151; background: #f9fafb; padding: 8px 12px; border-radius: 6px; margin: 8px 0; }
@media print { details { border: none; } summary { list-style: none; } }