:root{
  /* Pizarrón de salón, no negro: verde profundo */
  --pizarra:#123A2E;
  --pizarra-alta:#1D5142;
  --tiza:#E4EDE7;

  /* Papel de cuaderno, frío — no crema */
  --papel:#F6F7F3;
  --papel-hondo:#EDEFE9;
  --cuadricula:#CBD8D2;

  --tinta:#16241F;
  --gris:#63736C;

  /* Marcatextos del profe */
  --ambar:#E0A526;
  --ambar-hondo:#B37F13;

  --whats:#1F9D55;

  --display:"Newsreader",Georgia,serif;
  --texto:"IBM Plex Sans",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,monospace;

  --max:1160px;
  --radio:3px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--papel);
  color:var(--tinta);
  font-family:var(--texto);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit}

.envoltura{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}

/* Salto al contenido: visible solo con teclado */
.saltar{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--pizarra);color:var(--tiza);
  padding:12px 20px;border-radius:0 0 var(--radio) 0;
  font-size:.92rem;text-decoration:none;
}
.saltar:focus{left:0}

/* ---------- Tipografía ---------- */
h1,h2,h3{font-family:var(--display);font-weight:500;line-height:1.08;letter-spacing:-.02em;margin:0}
h1{font-size:clamp(2.7rem,6.4vw,4.6rem)}
h2{font-size:clamp(2rem,4vw,3rem)}
h3{font-size:1.28rem;line-height:1.25}
p{margin:0 0 1rem}

.rotulo{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gris);
  margin:0 0 18px;
}
.rotulo--claro{color:rgba(228,237,231,.62)}

/* ---------- Botones ---------- */
.boton{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--texto);font-size:1.02rem;font-weight:600;
  padding:16px 28px;border-radius:var(--radio);
  text-decoration:none;border:1.5px solid transparent;
  transition:transform .16s ease,background .16s ease,box-shadow .16s ease;
}
.boton:hover{transform:translateY(-2px)}
.boton:focus-visible{outline:3px solid var(--ambar);outline-offset:3px}
.boton--wa{background:var(--whats);color:#fff;box-shadow:0 6px 0 -2px rgba(18,58,46,.28)}
.boton--wa:hover{background:#1a8748}
.boton--linea{border-color:rgba(22,36,31,.28);color:var(--tinta)}
.boton--linea:hover{border-color:var(--tinta);background:rgba(22,36,31,.04)}
.boton--tiza{border-color:rgba(228,237,231,.4);color:var(--tiza)}
.boton--tiza:hover{background:rgba(228,237,231,.1)}

/* ---------- Barra superior ---------- */
.barra{
  position:sticky;top:0;z-index:60;
  background:rgba(246,247,243,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--cuadricula);
}
.barra__int{display:flex;align-items:center;justify-content:space-between;height:68px}
.marca{font-family:var(--display);font-size:1.42rem;font-weight:600;text-decoration:none;letter-spacing:-.02em}
.marca span{color:var(--ambar-hondo)}
.barra__nav{display:flex;align-items:center;gap:30px}
.barra__nav a{
  font-size:.92rem;text-decoration:none;color:var(--gris);
  border-bottom:1.5px solid transparent;padding-bottom:2px;
}
.barra__nav a:hover{color:var(--tinta);border-bottom-color:var(--ambar)}
.barra__wa{
  font-size:.92rem;font-weight:600;text-decoration:none;color:#fff;
  background:var(--whats);padding:10px 18px;border-radius:var(--radio);
}
@media(max-width:860px){.barra__nav a{display:none}}

/* ---------- Hero ---------- */
.hero{padding:76px 0 88px}
.hero__rejilla{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
@media(max-width:960px){.hero__rejilla{grid-template-columns:1fr;gap:48px}}

.hero h1 em{font-style:normal;position:relative;white-space:nowrap}
.hero h1 em::after{
  content:"";position:absolute;left:0;right:0;bottom:.1em;height:.34em;
  background:var(--ambar);opacity:.42;z-index:-1;
}
.hero__bajada{font-size:1.18rem;color:#3c4a44;max-width:30em;margin-top:22px}
.hero__acciones{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero__nota{font-family:var(--mono);font-size:.78rem;color:var(--gris);margin-top:20px}
.hero__nota a{color:var(--tinta);text-underline-offset:3px}

/* ---------- Panel de cuaderno (elemento firma) ---------- */
.cuaderno{
  background:
    repeating-linear-gradient(to right,var(--cuadricula) 0 1px,transparent 1px 26px),
    repeating-linear-gradient(to bottom,var(--cuadricula) 0 1px,transparent 1px 26px),
    #FCFDFA;
  border:1px solid #BCCBC4;
  border-radius:var(--radio);
  box-shadow:0 18px 46px -24px rgba(18,58,46,.4);
  padding:30px 28px 32px;
  position:relative;
}
.cuaderno::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--ambar);
}
.cuaderno__ia{
  border-bottom:1px dashed #B5C4BD;padding-bottom:18px;margin-bottom:22px;
}
.cuaderno__etq{
  font-family:var(--mono);font-size:.7rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--gris);display:block;margin-bottom:10px;
}
.cuaderno__resp{
  font-family:var(--mono);font-size:1.16rem;color:#8B9A93;text-decoration:line-through;
  text-decoration-thickness:1.5px;
}
.cuaderno__lista{list-style:none;margin:0;padding:0;counter-reset:paso}
.cuaderno__lista li{
  font-family:var(--mono);font-size:.98rem;line-height:1.5;
  padding:9px 0 9px 40px;position:relative;
  opacity:0;transform:translateY(8px);
}
.cuaderno__lista li::before{
  counter-increment:paso;content:counter(paso);
  position:absolute;left:0;top:10px;
  width:22px;height:22px;border-radius:50%;
  background:var(--pizarra);color:var(--tiza);
  font-size:.7rem;display:grid;place-items:center;
}
.cuaderno__lista li.visible{animation:brotar .5s ease forwards}
.cuaderno__lista li.final{
  font-weight:500;color:var(--pizarra);
  background:linear-gradient(transparent 58%,rgba(224,165,38,.4) 58%);
  display:inline-block;padding-right:10px;
}
@keyframes brotar{to{opacity:1;transform:translateY(0)}}
.cuaderno__pie{
  font-family:var(--texto);font-size:.86rem;color:var(--gris);
  margin:22px 0 0;padding-top:16px;border-top:1px dashed #B5C4BD;
}

/* ---------- Franja de temas ---------- */
.franja{background:var(--pizarra);color:var(--tiza);padding:26px 0}
.franja__lista{
  display:flex;flex-wrap:wrap;gap:12px 30px;justify-content:center;
  font-family:var(--mono);font-size:.83rem;letter-spacing:.05em;
  color:rgba(228,237,231,.82);margin:0;padding:0;list-style:none;
}
.franja__lista li{display:flex;align-items:center;gap:10px}
.franja__lista li::before{content:"";width:5px;height:5px;background:var(--ambar);border-radius:50%}

/* ---------- Secciones ---------- */
.seccion{padding:96px 0}
.seccion--hondo{background:var(--papel-hondo)}
.seccion--pizarra{background:var(--pizarra);color:var(--tiza)}
.seccion__cabeza{max-width:34em;margin-bottom:52px}
.seccion__cabeza p{color:var(--gris);font-size:1.06rem;margin-top:16px}
.seccion--pizarra .seccion__cabeza p{color:rgba(228,237,231,.72)}

/* ---------- Casos ---------- */
.casos{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--cuadricula);border:1px solid var(--cuadricula)}
@media(max-width:820px){.casos{grid-template-columns:1fr}}
.caso{background:var(--papel);padding:34px 30px}
.caso h3{margin-bottom:12px}
.caso p{color:var(--gris);font-size:.98rem;margin:0}

/* ---------- Temas ---------- */
.temas{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
@media(max-width:820px){.temas{grid-template-columns:1fr}}
.tema{
  background:var(--papel);border:1px solid var(--cuadricula);
  border-left:3px solid var(--ambar);
  padding:28px 30px;border-radius:var(--radio);
}
.tema h3{margin-bottom:14px}
.tema ul{margin:0;padding-left:20px;color:var(--gris);font-size:.95rem;line-height:1.75}

/* ---------- Proceso ---------- */
.proceso{display:grid;grid-template-columns:repeat(4,1fr);gap:34px;counter-reset:etapa}
@media(max-width:880px){.proceso{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.proceso{grid-template-columns:1fr}}
.etapa{position:relative;padding-top:26px;border-top:1px solid rgba(228,237,231,.24)}
.etapa::before{
  counter-increment:etapa;content:counter(etapa,decimal-leading-zero);
  font-family:var(--mono);font-size:.76rem;color:var(--ambar);
  position:absolute;top:-9px;left:0;background:var(--pizarra);padding-right:12px;
}
.etapa h3{font-size:1.14rem;margin-bottom:10px}
.etapa p{font-size:.94rem;color:rgba(228,237,231,.72);margin:0}

/* ---------- Precio ---------- */
.precio{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
@media(max-width:880px){.precio{grid-template-columns:1fr;gap:36px}}
.tarifa{
  background:var(--papel);border:1px solid var(--cuadricula);border-radius:var(--radio);
  padding:36px 34px;box-shadow:0 14px 34px -22px rgba(18,58,46,.36);
}
.tarifa__cifra{font-family:var(--display);font-size:4.2rem;line-height:1;letter-spacing:-.03em}
.tarifa__cifra sup{font-size:1.6rem;vertical-align:super;color:var(--gris)}
.tarifa__unidad{font-family:var(--mono);font-size:.8rem;color:var(--gris);letter-spacing:.1em;text-transform:uppercase}
.tarifa__lista{list-style:none;margin:26px 0 30px;padding:0}
.tarifa__lista li{padding:9px 0 9px 26px;position:relative;font-size:.97rem;border-bottom:1px dashed var(--cuadricula)}
.tarifa__lista li:last-child{border-bottom:0}
.tarifa__lista li::before{content:"+";position:absolute;left:0;top:9px;color:var(--ambar-hondo);font-family:var(--mono);font-weight:500}

.horario{border-left:1px solid var(--cuadricula);padding-left:32px}
@media(max-width:880px){.horario{border-left:0;padding-left:0;border-top:1px solid var(--cuadricula);padding-top:32px}}
.horario h3{margin-bottom:16px}
.horario p{color:var(--gris);font-size:.98rem}
.horario__dias{display:flex;gap:6px;margin:22px 0 0;padding:0;list-style:none;flex-wrap:wrap}
.horario__dias li{
  font-family:var(--mono);font-size:.78rem;padding:8px 11px;
  border:1px solid var(--cuadricula);border-radius:var(--radio);color:var(--gris);
}
.horario__dias li.abierto{background:var(--pizarra);border-color:var(--pizarra);color:var(--tiza)}

/* ---------- Preguntas ---------- */
.pregunta{border-bottom:1px solid var(--cuadricula);padding:24px 0}
.pregunta summary{
  font-family:var(--display);font-size:1.24rem;cursor:pointer;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:20px;
}
.pregunta summary::-webkit-details-marker{display:none}
.pregunta summary::after{content:"+";font-family:var(--mono);color:var(--ambar-hondo);font-size:1.4rem;flex-shrink:0}
.pregunta[open] summary::after{content:"−"}
.pregunta p{margin:16px 0 0;color:var(--gris);font-size:.99rem;max-width:52em}

/* ---------- Cierre ---------- */
.cierre{background:var(--pizarra);color:var(--tiza);padding:100px 0;text-align:center}
.cierre h2{max-width:16em;margin:0 auto 22px}
.cierre p{color:rgba(228,237,231,.74);max-width:34em;margin:0 auto 34px}
.cierre__tel{font-family:var(--mono);font-size:.86rem;margin:26px auto 0}
.cierre__tel a{color:var(--tiza);text-underline-offset:3px}

/* ---------- Pie ---------- */
.pie{background:var(--pizarra);border-top:1px solid rgba(228,237,231,.16);color:rgba(228,237,231,.6);padding:32px 0;font-size:.86rem}
.pie__int{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.pie a{color:rgba(228,237,231,.82)}
.pie address{font-style:normal}

/* ---------- Revelado al hacer scroll ---------- */
.revelar{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.revelar.dentro{opacity:1;transform:none}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .revelar,.cuaderno__lista li{opacity:1!important;transform:none!important;transition:none!important;animation:none!important}
  .boton:hover{transform:none}
}