/*
Theme Name: Epístola
Theme URI: https://epistola.ai/
Author: Epístola
Author URI: https://epistola.ai/
Description: Tema propio de epistola.ai. PHP plano, sin constructores de páginas ni dependencias de terceros. One-page con anclas, blog, página de gracias y 404 propia.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.8
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: epistola
*/

/* ==========================================================================
   1. Base y variables
   ========================================================================== */

:root {
  --negro:        #000000;
  --negro-2:      #0a0c0d;
  --negro-3:      #111517;
  --linea:        #23292c;
  --blanco:       #ffffff;
  --gris:         #b7c0c4;
  --gris-2:       #7f8a8f;
  --cyan:         #00e3e1;
  --cyan-oscuro:  #00b3b1;
  --cyan-tenue:   rgba(0, 227, 225, 0.12);
  --max:          1180px;
  --max-texto:    760px;
  --header-h:     76px;
  --radio:        14px;
  --trans:        180ms ease;
  --sombra:       0 18px 50px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--negro);
  color: var(--blanco);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--trans);
}

a:hover { color: var(--blanco); }

h1, h2, h3, h4 {
  margin: 0 0 .6em;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.1rem, 5.2vw, 3.7rem); }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2.2vw, 1.4rem); }

p { margin: 0 0 1.1em; }

p:last-child { margin-bottom: 0; }

::selection {
  background: var(--cyan);
  color: var(--negro);
}

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.saltar-al-contenido {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  background: var(--cyan);
  color: var(--negro);
  padding: 12px 20px;
  font-weight: 600;
}

.saltar-al-contenido:focus {
  left: 12px;
  top: 12px;
}

/* ==========================================================================
   2. Utilidades de estructura
   ========================================================================== */

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

.seccion {
  padding: clamp(64px, 9vw, 116px) 0;
  position: relative;
}

.seccion--linea { border-top: 1px solid var(--linea); }

.seccion--tenue { background: var(--negro-2); }

.medido { max-width: var(--max-texto); }

.centrado {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.antetitulo {
  display: inline-block;
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  font-weight: 600;
  margin-bottom: 18px;
}

.entradilla {
  color: var(--gris);
  font-size: clamp(1.02rem, 1.6vw, 1.16rem);
}

.regla {
  width: 56px;
  height: 3px;
  background: var(--cyan);
  border: 0;
  margin: 0 0 26px;
}

.centrado .regla { margin-left: auto; margin-right: auto; }

/* ==========================================================================
   3. Botones
   ========================================================================== */

.boton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 30px;
  border-radius: 999px;
  border: 2px solid var(--cyan);
  background: var(--cyan);
  color: var(--negro);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  text-align: center;
  cursor: pointer;
  transition: background var(--trans), color var(--trans), border-color var(--trans), transform var(--trans);
  font-family: inherit;
}

.boton:hover,
.boton:focus {
  background: transparent;
  color: var(--cyan);
  transform: translateY(-2px);
}

.boton--linea {
  background: transparent;
  color: var(--blanco);
  border-color: var(--linea);
}

.boton--linea:hover,
.boton--linea:focus {
  border-color: var(--cyan);
  color: var(--cyan);
  background: transparent;
}

.botonera {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.centrado .botonera { justify-content: center; }

/* En móvil los botones ocupan el mismo ancho: nada desalineado. */
@media (max-width: 560px) {
  .botonera { flex-direction: column; align-items: stretch; }
  .botonera .boton { width: 100%; }
}

/* ==========================================================================
   4. Cabecera
   ========================================================================== */

.cabecera {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, .72);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background var(--trans), border-color var(--trans);
}

.cabecera.esta-fija {
  background: rgba(0, 0, 0, .94);
  border-bottom-color: var(--linea);
}

.cabecera__interior {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.marca {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.marca img {
  height: 30px;
  width: auto;
}

.marca__texto {
  color: var(--blanco);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav a {
  color: var(--gris);
  font-size: .94rem;
  font-weight: 500;
  padding: 10px 14px;
  border-radius: 8px;
  transition: color var(--trans), background var(--trans);
}

.nav a:hover,
.nav a:focus,
.nav a.activo {
  color: var(--blanco);
  background: rgba(255, 255, 255, .06);
}

.nav a.activo { color: var(--cyan); }

.nav .boton {
  min-height: 44px;
  padding: 0 22px;
  color: var(--negro);
  margin-left: 10px;
}

.nav .boton:hover { color: var(--cyan); background: transparent; }

.menu-boton {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--linea);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
}

.menu-boton span {
  display: block;
  position: relative;
  width: 20px;
  height: 2px;
  background: var(--blanco);
  transition: background var(--trans);
}

.menu-boton span::before,
.menu-boton span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--blanco);
  transition: transform var(--trans);
}

.menu-boton span::before { top: -6px; }
.menu-boton span::after  { top: 6px; }

.menu-boton[aria-expanded="true"] span { background: transparent; }
.menu-boton[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.menu-boton[aria-expanded="true"] span::after  { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 940px) {
  .menu-boton { display: inline-flex; }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--negro);
    border-bottom: 1px solid var(--linea);
    padding: 10px 24px 26px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--trans), transform var(--trans), visibility var(--trans);
  }

  .nav.abierto {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav a {
    padding: 15px 4px;
    border-bottom: 1px solid var(--linea);
    border-radius: 0;
    font-size: 1.02rem;
  }

  .nav .boton {
    margin: 18px 0 0;
    border-bottom: 0;
    justify-content: center;
  }
}

/* ==========================================================================
   5. Hero
   ========================================================================== */

.hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(56px, 8vw, 96px)) 0 clamp(60px, 8vw, 100px);
  overflow: hidden;
  isolation: isolate;
}

.hero__fondo {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero__fondo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .62;
}

.hero__velo {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(0,0,0,.94) 0%, rgba(0,0,0,.72) 48%, rgba(0,0,0,.3) 100%),
    linear-gradient(180deg, rgba(0,0,0,.8) 0%, rgba(0,0,0,.12) 42%, rgba(0,0,0,.92) 100%);
}

.hero__contenido { max-width: 700px; }

.hero h1 { margin-bottom: .35em; }

.hero h1 .destacado { color: var(--cyan); }

.hero__bajada {
  font-size: clamp(1.05rem, 1.9vw, 1.28rem);
  color: var(--gris);
  max-width: 600px;
  margin-bottom: 34px;
}

/* ==========================================================================
   6. Rejillas y tarjetas
   ========================================================================== */

.rejilla {
  display: grid;
  gap: 24px;
}

.rejilla--3 { grid-template-columns: repeat(3, 1fr); }
.rejilla--2 { grid-template-columns: repeat(2, 1fr); }
.rejilla--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .rejilla--3,
  .rejilla--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .rejilla--2,
  .rejilla--3,
  .rejilla--4 { grid-template-columns: 1fr; }
}

.tarjeta {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 32px 28px;
  background: var(--negro-3);
  border: 1px solid var(--linea);
  border-radius: var(--radio);
  transition: border-color var(--trans), transform var(--trans), background var(--trans);
}

.tarjeta:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
}

.tarjeta h3 { margin-bottom: .5em; }

.tarjeta p {
  color: var(--gris);
  font-size: .98rem;
  margin: 0;
}

.tarjeta__numero {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--cyan-tenue);
  color: var(--cyan);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 20px;
  flex: 0 0 auto;
}

/* Bloque de dos columnas con imagen */

.duo {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.duo--invertido .duo__texto { order: 2; }

@media (max-width: 900px) {
  .duo { grid-template-columns: 1fr; }
  .duo--invertido .duo__texto { order: 0; }
}

.duo__figura {
  margin: 0;
  border-radius: var(--radio);
  overflow: hidden;
  border: 1px solid var(--linea);
  box-shadow: var(--sombra);
}

.duo__figura img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

/* Lista con marcas */

.lista-marcada {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.lista-marcada li {
  position: relative;
  padding-left: 32px;
  color: var(--gris);
}

.lista-marcada li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(-45deg);
}

.lista-marcada strong {
  color: var(--blanco);
  font-weight: 600;
}

/* ==========================================================================
   7. Formulario
   ========================================================================== */

.contacto {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 60px);
  align-items: start;
}

@media (max-width: 900px) {
  .contacto { grid-template-columns: 1fr; }
}

.formulario {
  background: var(--negro-3);
  border: 1px solid var(--linea);
  border-radius: var(--radio);
  padding: clamp(26px, 3.6vw, 38px);
}

.campo { margin-bottom: 18px; }

.campo label {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  color: var(--blanco);
  margin-bottom: 8px;
}

.campo .opcional {
  color: var(--gris-2);
  font-weight: 400;
}

.campo input,
.campo textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--negro);
  border: 1px solid var(--linea);
  border-radius: 10px;
  color: var(--blanco);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  transition: border-color var(--trans), box-shadow var(--trans);
}

.campo input::placeholder,
.campo textarea::placeholder { color: var(--gris-2); }

.campo input:focus,
.campo textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px var(--cyan-tenue);
}

.campo textarea {
  min-height: 118px;
  resize: vertical;
}

.consentimiento {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin: 20px 0 24px;
  font-size: .88rem;
  color: var(--gris);
  line-height: 1.55;
}

.consentimiento input {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  flex: 0 0 auto;
  accent-color: var(--cyan);
}

.formulario .boton { width: 100%; }

.trampa {
  position: absolute !important;
  left: -9999px !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.aviso {
  padding: 14px 18px;
  border-radius: 10px;
  margin-bottom: 22px;
  font-size: .94rem;
  border: 1px solid;
}

.aviso--error {
  background: rgba(255, 88, 88, .09);
  border-color: rgba(255, 88, 88, .45);
  color: #ffb3b3;
}

.aviso--ok {
  background: var(--cyan-tenue);
  border-color: var(--cyan);
  color: var(--cyan);
}

.datos-contacto {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.datos-contacto li {
  color: var(--gris);
  font-size: .98rem;
}

.datos-contacto a { font-weight: 500; }

/* ==========================================================================
   8. Blog
   ========================================================================== */

.pagina-cabecera {
  padding: calc(var(--header-h) + 56px) 0 46px;
  border-bottom: 1px solid var(--linea);
}

.migas {
  font-size: .84rem;
  color: var(--gris-2);
  margin-bottom: 16px;
}

.migas a { color: var(--gris); }

.migas span { margin: 0 8px; }

.entradas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

@media (max-width: 900px) { .entradas { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .entradas { grid-template-columns: 1fr; } }

.entrada-tarjeta {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--negro-3);
  border: 1px solid var(--linea);
  border-radius: var(--radio);
  overflow: hidden;
  transition: border-color var(--trans), transform var(--trans);
}

.entrada-tarjeta:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
}

.entrada-tarjeta__imagen {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--negro-2);
}

.entrada-tarjeta__imagen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.entrada-tarjeta__cuerpo {
  padding: 26px 24px 28px;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.entrada-tarjeta h2,
.entrada-tarjeta h3 {
  font-size: 1.2rem;
  margin-bottom: .5em;
}

.entrada-tarjeta h2 a,
.entrada-tarjeta h3 a { color: var(--blanco); }

.entrada-tarjeta h2 a:hover,
.entrada-tarjeta h3 a:hover { color: var(--cyan); }

.entrada-tarjeta p {
  color: var(--gris);
  font-size: .95rem;
  flex: 1 1 auto;
}

.meta {
  font-size: .8rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--gris-2);
  margin-bottom: 14px;
}

.enlace-mas {
  margin-top: 18px;
  font-weight: 600;
  font-size: .93rem;
  align-self: flex-start;
}

/* Entrada individual */

.entrada {
  padding: 54px 0 clamp(60px, 8vw, 96px);
}

.entrada__contenido {
  max-width: var(--max-texto);
  margin: 0 auto;
  font-size: 1.06rem;
}

.entrada__contenido h2 {
  margin-top: 1.9em;
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
}

.entrada__contenido h3 {
  margin-top: 1.6em;
  color: var(--cyan);
}

.entrada__contenido p,
.entrada__contenido li { color: var(--gris); }

.entrada__contenido strong { color: var(--blanco); }

.entrada__contenido ul,
.entrada__contenido ol { padding-left: 22px; }

.entrada__contenido li { margin-bottom: .6em; }

.entrada__contenido blockquote {
  margin: 2em 0;
  padding: 4px 0 4px 26px;
  border-left: 3px solid var(--cyan);
  color: var(--blanco);
  font-size: 1.14rem;
}

.entrada__contenido img {
  border-radius: var(--radio);
  margin: 2em 0;
}

.entrada__destacada {
  max-width: var(--max);
  margin: 0 auto 46px;
  border-radius: var(--radio);
  overflow: hidden;
  border: 1px solid var(--linea);
}

.paginacion {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 52px;
}

.paginacion .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--linea);
  border-radius: 10px;
  color: var(--gris);
}

.paginacion .page-numbers.current,
.paginacion .page-numbers:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.cinta-cta {
  margin-top: 60px;
  padding: clamp(34px, 5vw, 52px);
  border: 1px solid var(--linea);
  border-radius: var(--radio);
  background: var(--negro-3);
  text-align: center;
}

.cinta-cta h2 { font-size: clamp(1.35rem, 2.6vw, 1.8rem); }

.cinta-cta p {
  color: var(--gris);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   9. Gracias y 404
   ========================================================================== */

.pantalla-central {
  min-height: 76vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 60px) 0 90px;
}

.pantalla-central .contenedor {
  text-align: center;
  max-width: 720px;
}

.codigo-grande {
  font-size: clamp(4rem, 13vw, 8.5rem);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -.04em;
  margin-bottom: .1em;
}

.marca-ok {
  width: 78px;
  height: 78px;
  margin: 0 auto 28px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.marca-ok::after {
  content: "";
  width: 26px;
  height: 14px;
  border-left: 3px solid var(--cyan);
  border-bottom: 3px solid var(--cyan);
  transform: rotate(-45deg) translate(2px, -3px);
}

/* ==========================================================================
   10. Pie
   ========================================================================== */

.pie {
  border-top: 1px solid var(--linea);
  background: var(--negro-2);
  padding: 58px 0 30px;
}

.pie__rejilla {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}

@media (max-width: 820px) {
  .pie__rejilla { grid-template-columns: 1fr 1fr; }
  .pie__marca { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .pie__rejilla { grid-template-columns: 1fr; }
}

.pie__marca img {
  height: 36px;
  width: auto;
  margin-bottom: 18px;
}

.pie__marca p {
  color: var(--gris);
  font-size: .95rem;
  max-width: 340px;
}

.pie h4 {
  font-size: .8rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gris-2);
  margin-bottom: 18px;
  font-weight: 600;
}

.pie ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.pie ul a {
  color: var(--gris);
  font-size: .95rem;
}

.pie ul a:hover { color: var(--cyan); }

.pie__base {
  border-top: 1px solid var(--linea);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  color: var(--gris-2);
  font-size: .86rem;
}

/* ==========================================================================
   11. Preferencias de movimiento
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }

  .tarjeta:hover,
  .entrada-tarjeta:hover,
  .boton:hover { transform: none; }
}