:root{
  --bosque:#0F261D; --bosque2:#123426; --bosque3:#173f2f; --esmeralda:#2D7D58; --menta:#64D295;
  --blanco:#FFFFFF; --texto:#D9EBE0; --suave:#9CC3AE; --rojo:#FF5A5F; --radio:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bosque);color:var(--texto);font-family:Montserrat,system-ui,-apple-system,Segoe UI,Arial,sans-serif;font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--menta)}
img{max-width:100%;display:block}
.contenedor{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}
.angosto{max-width:820px}
.centro{text-align:center}

/* barra */
.barra{position:sticky;top:0;z-index:20;background:rgba(15,38,29,.92);backdrop-filter:blur(8px);border-bottom:1px solid rgba(100,210,149,.12)}
.barra-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:900;font-size:24px;color:var(--blanco);text-decoration:none;letter-spacing:.3px}
.logo span{color:var(--menta)}
.barra-cta{font-weight:700;font-size:14px;color:var(--bosque);background:var(--menta);padding:9px 18px;border-radius:999px;text-decoration:none}

/* tipografía */
h1,h2,h3{color:var(--blanco);line-height:1.15;margin:0 0 14px}
h1{font-size:clamp(32px,5vw,54px);font-weight:900;letter-spacing:-.5px}
h1 span,.titulo span{color:var(--menta)}
.titulo{font-size:clamp(26px,3.4vw,38px);font-weight:800;margin-bottom:28px}
.etiqueta{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;color:var(--menta);margin:0 0 12px}
.etiqueta.centro{display:block}
.bajada{font-size:clamp(17px,1.6vw,20px);color:var(--texto);margin:0 0 22px}

/* botones */
.boton{display:inline-block;background:var(--menta);color:var(--bosque);font-weight:800;text-decoration:none;border:0;border-radius:12px;padding:14px 26px;font-size:17px;font-family:inherit;cursor:pointer;transition:transform .15s,box-shadow .15s}
.boton:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(100,210,149,.25)}
.boton-grande{width:100%;padding:17px 24px;font-size:18px}
.boton-sec{background:transparent;color:var(--menta);border:2px solid var(--menta)}
.boton:disabled{opacity:.7;cursor:wait}
.botones{display:flex;flex-direction:column;gap:12px;max-width:420px;margin:0 auto}

/* hero */
.hero{position:relative;overflow:hidden;padding:64px 0 72px;background:radial-gradient(900px 500px at 85% 0%,rgba(45,125,88,.35),transparent 60%),var(--bosque)}
.hero-fondo{position:absolute;inset:auto 0 0 0;width:100%;height:60%;pointer-events:none}
.hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero-lista{list-style:none;padding:0;margin:0}
.hero-lista li{position:relative;padding-left:32px;margin-bottom:10px;font-weight:600;color:var(--blanco)}
.hero-lista li:before{content:"";position:absolute;left:0;top:5px;width:20px;height:20px;border-radius:50%;background:var(--menta) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3 3 7-7' stroke='%230F261D' stroke-width='2.4' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.hero-chico{padding:72px 0}
.icono-ok{width:72px;height:72px;border-radius:50%;background:var(--menta);color:var(--bosque);font-size:40px;font-weight:900;display:flex;align-items:center;justify-content:center;margin:0 auto 22px}

/* formulario */
.tarjeta-form{background:var(--bosque2);border:1px solid rgba(100,210,149,.25);border-radius:20px;padding:28px;box-shadow:0 30px 60px rgba(0,0,0,.35);scroll-margin-top:90px}
.tarjeta-form h2{font-size:26px;margin-bottom:6px}
.tarjeta-sub{margin:0 0 18px;color:var(--suave);font-size:15px}
.tarjeta-cierre{text-align:left;max-width:480px;margin:10px auto 0}
.campo{display:block;margin-bottom:14px}
.campo span{display:block;font-size:14px;font-weight:700;color:var(--blanco);margin-bottom:6px}
.campo input{width:100%;font:inherit;font-size:16px;color:var(--blanco);background:var(--bosque);border:1.5px solid rgba(156,195,174,.35);border-radius:10px;padding:13px 14px;outline:none}
.campo input:focus{border-color:var(--menta);box-shadow:0 0 0 3px rgba(100,210,149,.2)}
.campo input::placeholder{color:#6f9583}
.check{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;line-height:1.5;color:var(--suave);margin:4px 0 18px}
.check input{width:18px;height:18px;margin-top:2px;accent-color:var(--menta);flex:none}
.form-nota{text-align:center;font-size:13px;color:var(--suave);margin:10px 0 0}
.form-error{background:rgba(255,90,95,.12);border:1px solid var(--rojo);color:#ffd2d3;border-radius:10px;padding:10px 12px;font-size:14px}
.trampa{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* bloques */
.bloque{padding:84px 0}
.bloque-oscuro{background:#0B1F17}
.temas{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.tema{background:var(--bosque2);border:1px solid rgba(100,210,149,.12);border-radius:var(--radio);padding:22px}
.tema .num{display:block;font-weight:900;font-size:14px;color:var(--menta);margin-bottom:10px;letter-spacing:1px}
.tema h3{font-size:18px;margin-bottom:8px}
.tema p{margin:0;font-size:15px;color:var(--suave)}
.tema.destacado{background:linear-gradient(160deg,var(--esmeralda),#1d5a3f);border-color:transparent}
.tema.destacado p{color:#e5f6ec}
.tema.destacado .num{color:var(--blanco)}

.libro-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;align-items:center}
.libro-visual{display:flex;justify-content:center;perspective:1400px}
.libro3d{width:min(320px,80%);aspect-ratio:3/4.2;transform:rotateY(-18deg) rotateX(4deg);border-radius:4px 12px 12px 4px;box-shadow:-18px 24px 50px rgba(0,0,0,.55),inset 6px 0 0 rgba(255,255,255,.08);overflow:hidden;background:var(--bosque)}
.libro3d img{width:100%;height:100%;object-fit:cover}
.libro-tapa{height:100%;padding:28px 24px;display:flex;flex-direction:column;background:radial-gradient(300px 260px at 80% 20%,rgba(100,210,149,.35),transparent 60%),linear-gradient(170deg,#163f2f,#0F261D 60%);border-left:10px solid var(--esmeralda)}
.libro-marca{font-weight:900;color:var(--blanco);font-size:18px}.libro-marca b{color:var(--menta)}
.libro-titulo{margin-top:auto;font-weight:900;font-size:40px;line-height:1.02;color:var(--blanco)}
.libro-sub{margin-top:12px;font-size:13px;color:var(--menta);font-weight:600}
.recibes{display:grid;gap:14px;margin-bottom:26px}
.recibe{border-left:3px solid var(--menta);padding:4px 0 4px 18px}
.recibe h3{font-size:19px;margin-bottom:4px}
.recibe p{margin:0;color:var(--suave)}

.pasos{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.paso{background:var(--bosque2);border-radius:var(--radio);padding:26px;border:1px solid rgba(100,210,149,.12)}
.paso span{display:inline-flex;width:42px;height:42px;border-radius:50%;background:var(--menta);color:var(--bosque);font-weight:900;align-items:center;justify-content:center;margin-bottom:14px}
.paso h3{font-size:19px;margin-bottom:6px}
.paso p{margin:0;color:var(--suave)}

.dos-col{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.lista-check{list-style:none;padding:0;margin:0}
.lista-check li{position:relative;padding-left:30px;margin-bottom:12px}
.lista-check li:before{content:"✓";position:absolute;left:0;color:var(--menta);font-weight:900}
.cita{background:var(--bosque2);border-radius:20px;padding:32px;border:1px solid rgba(100,210,149,.2)}
.cita p{font-size:21px;font-weight:700;color:var(--blanco);line-height:1.45;margin:0 0 14px}
.cita span{color:var(--menta);font-weight:600}

details{background:var(--bosque2);border:1px solid rgba(100,210,149,.12);border-radius:14px;padding:4px 20px;margin-bottom:12px}
summary{cursor:pointer;font-weight:700;color:var(--blanco);padding:14px 0;list-style:none;position:relative;padding-right:30px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";position:absolute;right:0;top:10px;font-size:24px;color:var(--menta)}
details[open] summary:after{content:"–"}
details p{margin:0 0 16px;color:var(--suave)}

.cierre{background:radial-gradient(700px 360px at 50% 0%,rgba(45,125,88,.4),transparent 70%),var(--bosque)}

.texto-legal h1{font-size:36px}
.texto-legal h2{font-size:21px;margin-top:30px}
.texto-legal li{margin-bottom:6px}

/* pie */
.pie{border-top:1px solid rgba(100,210,149,.12);padding:40px 0 48px;font-size:13.5px;color:#86ab97}
.logo-pie{font-size:20px;margin-bottom:12px}
.aviso-riesgo{max-width:900px}
.pie-links a{color:var(--suave)}

/* celular */
@media (max-width:980px){
  .hero-grid,.libro-grid,.dos-col{grid-template-columns:1fr;gap:36px}
  .temas{grid-template-columns:repeat(2,1fr)}
  .libro-visual{order:-1}
}
@media (max-width:640px){
  body{font-size:16px}
  .contenedor{padding:0 16px}
  .hero{padding:40px 0 48px}
  .bloque{padding:56px 0}
  .temas,.pasos{grid-template-columns:1fr}
  .tarjeta-form{padding:22px 18px}
  .libro3d{width:62%}
  .barra-cta{padding:8px 14px}
}

.reloj{background:rgba(255,140,50,.12);border:2px solid #FF8C32;border-radius:12px;padding:12px;margin:0 0 18px;text-align:center}
.reloj-titulo{margin:0 0 8px;font-weight:800;color:#FFB04D;font-size:14px;text-transform:uppercase;letter-spacing:.04em}
.reloj-cajas{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.reloj-cajas span{background:#2A1A0C;border:1px solid rgba(255,140,50,.4);border-radius:8px;padding:8px 4px;font-size:11px;color:var(--suave);text-transform:uppercase}
.reloj-cajas b{display:block;font-size:24px;line-height:1.1;color:var(--blanco);font-weight:800}
.reloj-cajas b.cae{animation:cae .6s ease-out}
@keyframes cae{0%{color:#FF4040;transform:scale(1.18)}100%{color:var(--blanco);transform:scale(1)}}