/* ==========================================================
   Julian — landing "cuaderno de apuntes"
   ========================================================== */

:root {
  --papel:    #FAF8F3;
  --tinta:    #1B2A4A;
  --marcador: #FFD449;
  --acento:   #E85D3D;
  --niebla:   #E9E4D8;
  --exito:    #2F7D5B;

  /* derivados (contraste AA verificado) */
  --tinta-suave: color-mix(in srgb, var(--tinta) 72%, var(--papel));
  --error:       #B0361B;
  --exito-claro: #8FD6B1;
  --blanco:      #FFFFFF;

  --fuente-display: "Bricolage Grotesque", "Avenir Next", "Trebuchet MS", sans-serif;
  --fuente-cuerpo:  "Figtree", "Avenir", "Segoe UI", sans-serif;
  --fuente-mono:    "JetBrains Mono", "SF Mono", Consolas, monospace;

  --radio: 14px;
  --alto-cabecera: 64px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-padding-top: calc(var(--alto-cabecera) + 16px);
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: var(--fuente-cuerpo);
  font-size: 1.0625rem; /* 17px */
  line-height: 1.6;
  color: var(--tinta);
  background: var(--papel);
  -webkit-font-smoothing: antialiased;
  touch-action: manipulation;
}

.contenedor {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 32px);
}

.visualmente-oculto {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- foco visible ---------- */
:focus-visible {
  outline: 3px solid var(--acento);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- tipografía base ---------- */
h1, h2, h3 {
  font-family: var(--fuente-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.12;
  text-wrap: balance;
}

h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); margin-bottom: 0.5em; }

.eyebrow {
  font-family: var(--fuente-cuerpo);
  font-weight: 500;
  font-size: 0.8125rem; /* 13px */
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  margin-bottom: 14px;
}

.mono { font-family: var(--fuente-mono); font-size: 0.92em; }

/* ---------- subrayado de marcador ---------- */
.marca {
  position: relative;
  z-index: 0;
  white-space: nowrap;
}
.marca::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -0.08em; right: -0.12em;
  top: 58%; bottom: -0.02em;
  background: var(--marcador);
  transform: rotate(-1.5deg);
  border-radius: 3px;
}

.marca-fina {
  background-image: linear-gradient(transparent 62%, var(--marcador) 62%, var(--marcador) 96%, transparent 96%);
  padding-inline: 0.05em;
}

/* ==========================================================
   Cabecera
   ========================================================== */
.cabecera {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--alto-cabecera);
  background: var(--papel);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.cabecera.con-borde { border-bottom-color: var(--niebla); }

.cabecera__interior {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--fuente-display);
  font-weight: 700;
  font-size: 1.45rem;
  letter-spacing: -0.02em;
  color: var(--tinta);
  text-decoration: none;
}

.cabecera__cta {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--tinta);
  text-decoration: none;
  border: 1.5px solid var(--tinta);
  border-radius: 999px;
  padding: 9px 18px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: background-color 0.15s ease;
}
.cabecera__cta:hover { background: var(--marcador); }

/* ==========================================================
   Hero
   ========================================================== */
.hero { padding: calc(var(--alto-cabecera) + clamp(48px, 8vw, 96px)) 0 clamp(56px, 8vw, 96px); }

.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero__titulo {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  margin-bottom: 0.35em;
}

.hero__sub {
  font-size: 1.15rem;
  max-width: 34em;
  margin-bottom: 28px;
}

/* ---------- formulario ---------- */
.form-correo { max-width: 520px; }

.form-correo__fila {
  display: flex;
  gap: 10px;
}

.form-correo input[type="email"] {
  -webkit-appearance: none; /* iOS Safari: sin estilo nativo, respeta altura y radios */
  appearance: none;
  flex: 1;
  min-width: 0;
  min-height: 54px;
  padding: 14px 16px;
  font-family: var(--fuente-cuerpo);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--tinta);
  background: var(--blanco);
  border: 1.5px solid var(--niebla);
  border-radius: 12px;
  transition: border-color 0.15s ease;
}
.form-correo input[type="email"]:hover { border-color: var(--tinta-suave); }
.form-correo input[type="email"]:focus-visible {
  outline: 3px solid var(--acento);
  outline-offset: 1px;
  border-color: transparent;
}
.form-correo input::placeholder { color: var(--tinta-suave); }
.form-correo input[aria-invalid="true"] { border-color: var(--error); }

.form-correo button {
  -webkit-appearance: none; /* iOS Safari: sin estilo nativo */
  appearance: none;
  min-height: 54px;
  padding: 12px 24px;
  font-family: var(--fuente-display);
  font-size: 1.2rem;  /* ≥18.66px bold: AA texto grande sobre --acento */
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--blanco);
  background: var(--acento);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}
.form-correo button:hover { background: var(--marcador); color: var(--tinta); }
.form-correo button:active { transform: translateY(1px); }

.form-micro {
  font-size: 0.875rem;
  color: var(--tinta-suave);
  margin-top: 10px;
}

.form-error {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--error);
  margin-top: 10px;
}

.form-exito {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--exito);
  border: 1.5px solid var(--exito);
  border-radius: var(--radio);
  padding: 16px 20px;
  max-width: 520px;
}

/* ---------- prueba social ---------- */
.prueba-social {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  font-size: 0.95rem;
  color: var(--tinta-suave);
}

.avatares { display: flex; }
.avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 2px solid var(--papel);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: 600 0.8rem var(--fuente-display);
  color: var(--tinta);
  margin-left: -8px;
}
.avatar:first-child { margin-left: 0; }
.avatar--a { background: var(--niebla); }
.avatar--b { background: var(--marcador); }
.avatar--c { background: var(--tinta); color: var(--papel); }
.avatar--d { background: var(--niebla); }

/* ---------- tarjeta de prompt (elemento firma) ---------- */
.hero__demo { min-width: 0; }

.tarjeta-prompt {
  position: relative;
  background: var(--blanco);
  border: 1.5px solid var(--niebla);
  border-radius: 18px;
  padding: 30px 26px 26px;
  min-height: 320px;
  transform: rotate(-1deg);
  box-shadow: 0 2px 0 var(--niebla);
}

.tarjeta-prompt__cinta {
  position: absolute;
  top: -12px; left: 50%;
  width: 92px; height: 24px;
  background: var(--marcador);
  opacity: 0.85;
  transform: translateX(-50%) rotate(2deg);
  border-radius: 2px;
}

.chip-prompt {
  display: inline-block;
  font: 400 0.6875rem var(--fuente-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  border: 1px solid var(--niebla);
  border-radius: 6px;
  padding: 3px 8px;
  margin-bottom: 12px;
}

.tarjeta-prompt__pregunta {
  min-height: 5.2em;
  font-size: 0.95rem;
  line-height: 1.55;
}

.caret {
  display: inline-block;
  width: 0.55em; height: 1.15em;
  background: var(--tinta);
  vertical-align: text-bottom;
  margin-left: 2px;
}
@media (prefers-reduced-motion: no-preference) {
  .caret { animation: parpadeo 1.1s steps(2) infinite; }
}
@keyframes parpadeo { 50% { opacity: 0; } }

.tarjeta-prompt__respuesta {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-top: 1px dashed var(--niebla);
  padding-top: 18px;
  margin-top: 18px;
  min-height: 110px;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.tarjeta-prompt__respuesta.visible { opacity: 1; }

.avatar-guia { flex-shrink: 0; }

.tarjeta-prompt__quien {
  font: 600 0.9rem var(--fuente-display);
  margin-bottom: 2px;
}

.tarjeta-prompt__texto { font-size: 0.95rem; }

.hero__demo-pie {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--tinta-suave);
  text-align: center;
  margin-top: 20px;
}

/* ==========================================================
   Secciones comunes
   ========================================================== */
section { padding-block: clamp(56px, 9vw, 104px); }
.hero { padding-top: calc(var(--alto-cabecera) + clamp(48px, 8vw, 96px)); }

/* ---------- Qué vas a recibir ---------- */
.recibir { border-top: 1px solid var(--niebla); }

.recibir__tarjetas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.tarjeta {
  background: var(--blanco);
  border: 1.5px solid var(--niebla);
  border-radius: var(--radio);
  padding: 28px 24px;
}

.tarjeta__icono { color: var(--tinta); margin-bottom: 14px; }

.tarjeta h3 { font-size: 1.2rem; margin-bottom: 8px; }
.tarjeta p { font-size: 0.98rem; }

/* ---------- Así se ve por dentro ---------- */
.dentro__apuntes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.apunte {
  background: var(--blanco);
  border: 1.5px solid var(--niebla);
  border-radius: var(--radio);
  padding: 26px 22px;
  box-shadow: 0 2px 0 var(--niebla);
}
.apunte:nth-child(odd)  { transform: rotate(-0.5deg); }
.apunte:nth-child(even) { transform: rotate(0.4deg); }

.apunte__num {
  font: 400 0.75rem var(--fuente-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--tinta-suave);
  margin-bottom: 6px;
}

.apunte h3 { font-size: 1.25rem; margin-bottom: 14px; }

.caja-prompt {
  background: var(--papel);
  border: 1.5px solid var(--niebla);
  border-radius: 12px;
  padding: 14px 16px;
}
.caja-prompt .mono {
  display: block;
  font-size: 0.85rem;
  line-height: 1.55;
}

.apunte__nota {
  display: flex;
  gap: 6px;
  align-items: baseline;
  font-size: 0.95rem;
  font-style: italic;
  font-weight: 500;
  margin-top: 14px;
}
.apunte__nota .flecha {
  flex-shrink: 0;
  color: var(--acento);
  align-self: center;
}

/* ---------- Testimonios ---------- */
.testimonios { border-top: 1px solid var(--niebla); }

.testimonios__fila {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: 40px;
}

.testimonio { position: relative; padding-top: 34px; }

.testimonio__comilla {
  position: absolute;
  top: -10px; left: -6px;
  font: 800 4rem/1 var(--fuente-display);
  color: var(--tinta);
  opacity: 0.14;
  pointer-events: none;
}

.testimonio blockquote { font-size: 1.02rem; }

.testimonio figcaption {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--tinta-suave);
}
.testimonio figcaption strong { color: var(--tinta); font-weight: 600; }

/* ---------- CTA final ---------- */
.cierre {
  background: var(--tinta);
  color: var(--blanco);
}

.cierre__interior {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.cierre__titulo {
  color: var(--blanco);
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: 0.3em;
}

.cierre__sub {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 32px;
}

.form-correo--oscuro { width: 100%; max-width: 520px; }
.form-correo--oscuro input[type="email"] { border-color: transparent; }
.form-correo--oscuro .form-micro { color: rgba(255, 255, 255, 0.7); }
.form-correo--oscuro .form-error { color: #FFC9B5; }
.form-correo--oscuro button:focus-visible,
.form-correo--oscuro input[type="email"]:focus-visible {
  outline-color: var(--marcador);
}
.form-correo--oscuro .form-exito {
  color: var(--exito-claro);
  border-color: var(--exito-claro);
  margin-inline: auto;
}

/* ---------- Pie ---------- */
.pie {
  border-top: 1px solid var(--niebla);
  padding-block: 32px;
  font-size: 0.9rem;
}

.pie__interior {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.pie__logo {
  font-family: var(--fuente-display);
  font-weight: 700;
  font-size: 1.1rem;
}

.pie__enlaces { display: flex; gap: 20px; flex-wrap: wrap; }
.pie__enlaces a {
  color: var(--tinta-suave);
  text-decoration: none;
  padding-block: 10px; /* área táctil */
}
.pie__enlaces a:hover { color: var(--tinta); text-decoration: underline; }

.pie__copy { color: var(--tinta-suave); }

/* ==========================================================
   Animación de entrada (sutil, opcional)
   ========================================================== */
@media (prefers-reduced-motion: no-preference) {
  .anima.oculta {
    opacity: 0;
    transform: translateY(10px);
  }
  .anima {
    transition: opacity 0.45s ease-out, transform 0.45s ease-out;
  }
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 920px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__demo { max-width: 480px; }
  .recibir__tarjetas,
  .dentro__apuntes,
  .testimonios__fila { grid-template-columns: 1fr; max-width: 560px; }
  .apunte:nth-child(odd), .apunte:nth-child(even) { transform: none; }
}

@media (max-width: 520px) {
  .form-correo__fila { flex-direction: column; }
  .form-correo button { width: 100%; }
  .pie__interior { flex-direction: column; align-items: flex-start; }
  .tarjeta-prompt { padding: 26px 18px 20px; }
}