:root {
  --tinta: #13222c;
  --tinta-2: #1c3240;
  --papel: #f5f7f2;
  --papel-2: #e8eee3;
  --reactivo: #3fb6a8;
  --reactivo-oscuro: #1c766c;
  --ambar: #f2b134;
  --alerta: #b8412b;
  --texto: #1b2730;
  --suave: #56656e;
  --linea: #cdd7cc;
  --serif: "Noto Serif", Georgia, "Times New Roman", serif;
  --sans: "Noto Sans", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--papel);
  color: var(--texto);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.68;
  overflow-x: hidden;
}

body.bloquear-scroll { overflow: hidden; }

img, svg { max-width: 100%; }

a { color: var(--reactivo-oscuro); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--tinta); }

h1, h2, h3 { font-family: var(--serif); line-height: 1.22; color: var(--tinta); }
h1 { font-size: clamp(30px, 5.2vw, 50px); margin: 0 0 18px; font-weight: 700; color: #fff; letter-spacing: -0.01em; }
h2 { font-size: clamp(23px, 3vw, 30px); margin: 46px 0 14px; font-weight: 600; }
h3 { font-size: 20px; margin: 30px 0 10px; font-weight: 600; }
p { margin: 0 0 16px; }

/* banda superior: nav + portada comparten fondo */
.encabezar-sitio,
.contener-portada {
  background-color: var(--tinta);
  background-image:
    linear-gradient(rgba(63, 182, 168, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(63, 182, 168, .09) 1px, transparent 1px);
  background-size: 28px 28px;
  color: #dfe9e6;
}

.encabezar-sitio { position: relative; z-index: 20; }

.alinear-ancho { max-width: 1160px; margin: 0 auto; padding: 0 22px; }

.ordenar-barra {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 74px;
}

.marcar-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 25px;
  letter-spacing: .01em;
}
.marcar-logo:hover { color: var(--ambar); }
.marcar-logo svg { width: 30px; height: 30px; flex: none; }
.marcar-logo small {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--reactivo);
  border: 1px solid rgba(63, 182, 168, .5);
  padding: 2px 6px;
  border-radius: 3px;
}

.navegar-principal { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.navegar-principal a {
  display: block;
  padding: 8px 12px;
  color: #cfe0dc;
  text-decoration: none;
  font-size: 15px;
  border-radius: 4px;
}
.navegar-principal a:hover,
.navegar-principal a[aria-current="page"] { color: #fff; background: rgba(63, 182, 168, .18); }

.abrir-operador {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--ambar);
  color: var(--tinta);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 6px;
  border: 2px solid var(--ambar);
  white-space: nowrap;
}
.abrir-operador:hover { background: transparent; color: var(--ambar); }
.abrir-operador--claro { background: var(--reactivo-oscuro); border-color: var(--reactivo-oscuro); color: #fff; }
.abrir-operador--claro:hover { background: #fff; color: var(--reactivo-oscuro); }

.mostrar-menu {
  display: none;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, .3);
  color: #fff;
  border-radius: 6px;
  width: 46px;
  height: 42px;
  padding: 0;
  cursor: pointer;
}
.mostrar-menu span { display: block; width: 20px; height: 2px; background: currentColor; margin: 5px auto; }

/* cajón lateral que se desliza desde la izquierda */
.deslizar-cajon {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(82vw, 320px);
  background: var(--tinta-2);
  color: #fff;
  transform: translateX(-102%);
  transition: transform .26s ease;
  z-index: 60;
  padding: 22px 20px;
  overflow-y: auto;
}
.deslizar-cajon.mostrar-abierto { transform: translateX(0); box-shadow: 8px 0 30px rgba(0, 0, 0, .35); }
.deslizar-cajon ul { list-style: none; margin: 22px 0; padding: 0; }
.deslizar-cajon li a {
  display: flex;
  justify-content: space-between;
  color: #e3eeeb;
  text-decoration: none;
  padding: 13px 4px;
  border-bottom: 1px dashed rgba(63, 182, 168, .35);
}
.deslizar-cajon li a::after { content: "→"; color: var(--reactivo); }
.deslizar-cajon p { font-size: 13px; color: #9fb3b2; }
.cerrar-cajon {
  background: none;
  border: 1px solid rgba(255, 255, 255, .25);
  color: #fff;
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
}

.oscurecer-fondo {
  position: fixed;
  inset: 0;
  background: rgba(10, 20, 26, .55);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s;
  z-index: 50;
}
.oscurecer-fondo.mostrar-abierto { opacity: 1; visibility: visible; }

/* portada dentro del main, continúa la banda */
.contener-portada { padding: 34px 0 58px; position: relative; }
.contener-portada::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 14px;
  background:
    repeating-linear-gradient(90deg, var(--reactivo) 0 2px, transparent 2px 28px),
    repeating-linear-gradient(90deg, rgba(63, 182, 168, .5) 0 1px, transparent 1px 7px);
  background-size: 100% 14px, 100% 7px;
  background-repeat: no-repeat;
  background-position: bottom, bottom;
  opacity: .8;
}

.rotular-ensayo {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ambar);
  margin-bottom: 12px;
}
.resumir-entrada { font-size: 19px; max-width: 760px; color: #d4e2df; margin-bottom: 22px; }
.fechar-revision { font-size: 14px; color: #9db4b1; margin: 0; }
.fechar-revision time { color: #fff; }

.trazar-ruta { font-size: 13px; margin: 0 0 18px; color: #9db4b1; }
.trazar-ruta a { color: #cfe0dc; }

/* columnas: texto + cuaderno lateral */
.organizar-columnas {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  padding-top: 40px;
  padding-bottom: 60px;
}
.redactar-texto { min-width: 0; }
.redactar-texto > h2:first-child { margin-top: 0; }
.redactar-texto ul, .redactar-texto ol { padding-left: 22px; margin: 0 0 18px; }
.redactar-texto li { margin-bottom: 8px; }

.resumir-datos { position: relative; }
.fijar-cuaderno { position: sticky; top: 18px; }

.medir-panel {
  background: #fff;
  border: 1px solid var(--linea);
  border-top: 4px solid var(--reactivo);
  border-radius: 8px;
  padding: 18px 18px 8px;
  margin-bottom: 20px;
}
.medir-panel > strong {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--serif);
  font-size: 17px;
  color: var(--tinta);
  margin-bottom: 10px;
}
.medir-panel > strong svg { width: 22px; height: 22px; flex: none; }
.medir-fila {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  padding: 9px 0;
  border-top: 1px dashed var(--linea);
}
.medir-fila span:first-child { color: var(--suave); }
.medir-fila span:last-child { text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }

.etiquetar-estado {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 3px;
  background: #dff3ef;
  color: var(--reactivo-oscuro);
  white-space: nowrap;
}
.etiquetar-estado[data-estado="falta"] { background: #fbeee0; color: #8a5a0b; }
.etiquetar-estado[data-estado="aviso"] { background: #f9e3de; color: var(--alerta); }

/* fichas de ensayo dentro del texto */
.anotar-ensayo {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0 30px;
}
.anotar-ensayo > div {
  background: var(--papel-2);
  border-radius: 8px;
  padding: 16px;
  border-left: 3px solid var(--reactivo);
}
.anotar-ensayo b { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--suave); margin-bottom: 6px; }
.anotar-ensayo span { font-family: var(--serif); font-size: 18px; color: var(--tinta); line-height: 1.35; display: block; }

.destacar-resultado {
  background: #fff;
  border: 1px solid var(--linea);
  border-left: 5px solid var(--ambar);
  padding: 18px 20px;
  border-radius: 6px;
  margin: 26px 0;
}
.destacar-resultado p:last-child { margin-bottom: 0; }

.advertir-nota {
  font-size: 15px;
  background: #fbf3e4;
  border-radius: 6px;
  padding: 14px 16px;
  margin: 22px 0;
  color: #5c4513;
}

.comparar-tabla { overflow-x: auto; margin: 22px 0 28px; border: 1px solid var(--linea); border-radius: 8px; background: #fff; }
.comparar-tabla table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: 15px; }
.comparar-tabla th, .comparar-tabla td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--papel-2); vertical-align: top; }
.comparar-tabla th { background: var(--tinta); color: #e5efec; font-weight: 600; font-size: 13px; letter-spacing: .04em; text-transform: uppercase; }
.comparar-tabla tr:last-child td { border-bottom: 0; }

.listar-pasos { counter-reset: paso; list-style: none; padding: 0 !important; }
.listar-pasos li {
  counter-increment: paso;
  position: relative;
  padding: 4px 0 14px 54px;
  margin-bottom: 8px !important;
}
.listar-pasos li::before {
  content: counter(paso, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--tinta);
  color: var(--ambar);
  font-weight: 700;
  font-size: 14px;
  display: grid;
  place-items: center;
}

.revelar-bonus, .responder-duda {
  border: 1px solid var(--linea);
  border-radius: 8px;
  background: #fff;
  margin: 0 0 12px;
}
.revelar-bonus summary, .responder-duda summary {
  cursor: pointer;
  list-style: none;
  padding: 15px 46px 15px 18px;
  font-weight: 600;
  position: relative;
  color: var(--tinta);
}
.responder-duda summary::-webkit-details-marker, .revelar-bonus summary::-webkit-details-marker { display: none; }
.revelar-bonus summary::after, .responder-duda summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: var(--reactivo-oscuro);
}
.responder-duda[open] summary::after, .revelar-bonus[open] summary::after { content: "−"; }
.responder-duda > div, .revelar-bonus > div { padding: 0 18px 14px; }

.cerrar-ensayo {
  background: var(--tinta);
  color: #d9e7e4;
  border-radius: 10px;
  padding: 26px 24px;
  margin: 40px 0 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.cerrar-ensayo p { margin: 0; max-width: 520px; }

.firmar-autor {
  border-top: 1px solid var(--linea);
  margin-top: 40px;
  padding-top: 20px;
  font-size: 15px;
  color: var(--suave);
}
.firmar-autor strong { color: var(--tinta); }

/* pie */
.cerrar-pagina { background: var(--tinta); color: #a9bdbb; font-size: 14px; padding: 40px 0 28px; }
.cerrar-pagina a { color: #dbe8e5; }
.repartir-pie { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 30px; }
.navegar-seccion { list-style: none; margin: 0; padding: 0; }
.navegar-seccion li { margin-bottom: 7px; }
.cerrar-pagina h4 { font-family: var(--serif); color: #fff; font-size: 16px; margin: 0 0 12px; font-weight: 600; }
.firmar-pie { border-top: 1px solid rgba(255, 255, 255, .12); margin-top: 28px; padding-top: 18px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }

/* 404 */
.extraviar-muestra { text-align: left; padding-top: 60px; padding-bottom: 80px; }
.marcar-codigo {
  font-family: var(--serif);
  font-size: clamp(80px, 18vw, 160px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--reactivo);
  margin: 0 0 10px;
}
.extraviar-muestra ul { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; max-width: 560px; }
.extraviar-muestra li a {
  display: block;
  background: #fff;
  border: 1px solid var(--linea);
  border-radius: 8px;
  padding: 14px 16px;
  text-decoration: none;
  font-weight: 600;
}

@media (max-width: 980px) {
  .organizar-columnas { grid-template-columns: 1fr; gap: 10px; }
  .fijar-cuaderno { position: static; }
  .navegar-principal { display: none; }
  .mostrar-menu { display: block; }
  .ordenar-barra .abrir-operador { display: none; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .alinear-ancho { padding-left: 16px; padding-right: 16px; }
  .organizar-columnas { padding-top: 32px; padding-bottom: 48px; }
  .anotar-ensayo { grid-template-columns: 1fr; }
  .repartir-pie { grid-template-columns: 1fr; }
  .resumir-entrada { font-size: 17px; }
  .contener-portada { padding: 22px 0 48px; }
  .cerrar-ensayo { padding: 22px 18px; }
  .extraviar-muestra ul { grid-template-columns: 1fr; }
}

.citar-fuente { font-size: 13px; color: var(--suave); margin: -16px 0 26px; }
.contar-pasos { margin: 0 0 18px; }