/* ==========================================================================
   SILLAR — hoja de estilos única
   Paleta: papel #F7F3EA · tinta #12222A · petróleo #1F3A44 · dorado #B68C4A
   Motivo: bloques que se apilan como hiladas.
   ========================================================================== */

:root {
  --papel: #F7F3EA;
  --papel-2: #EFE8DA;
  --blanco: #FFFDF8;
  --tinta: #12222A;
  --petroleo: #1F3A44;
  --petroleo-2: #16303A;
  --dorado: #B68C4A;
  --dorado-claro: #D9BC85;
  --linea: rgba(31, 58, 68, 0.18);
  --linea-fuerte: rgba(31, 58, 68, 0.34);
  --linea-clara: rgba(247, 243, 234, 0.24);
  --sombra: 0 20px 44px -30px rgba(18, 34, 42, 0.55);
  --radio: 6px;
  --ancho: 1120px;
  --serif: "Bitter", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

/* --- Reinicio ------------------------------------------------------------ */

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

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

body {
  margin: 0;
  background-color: var(--papel);
  color: var(--tinta);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-abierto {
  overflow: hidden;
}

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

a {
  color: var(--petroleo);
  text-underline-offset: 0.2em;
}

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

p {
  margin: 0 0 1rem;
}

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
}

li {
  margin-bottom: 0.4rem;
}

strong {
  font-weight: 600;
}

/* --- Tipografía --------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  font-family: var(--serif);
  font-weight: 800;
  line-height: 1.14;
  color: var(--petroleo);
  margin: 0 0 0.75em;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.5rem);
}

h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.35rem);
}

h3 {
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  font-weight: 700;
}

h4 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.antetitulo {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dorado);
  margin: 0 0 1rem;
}

.entradilla {
  font-size: clamp(1.1rem, 2.1vw, 1.32rem);
  line-height: 1.55;
  color: #24404B;
  max-width: 62ch;
}

.texto-suave {
  color: #3D5560;
}

.texto-mini {
  font-size: 0.9rem;
  color: #4A626D;
}

/* --- Estructura --------------------------------------------------------- */

.contenedor {
  width: 100%;
  max-width: var(--ancho);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.seccion {
  padding-block: clamp(3.25rem, 7vw, 5.5rem);
}

.seccion--ajustada {
  padding-block: clamp(2.25rem, 5vw, 3.25rem);
}

.seccion--papel {
  background-color: var(--papel);
}

.seccion--alt {
  background-color: var(--papel-2);
}

.seccion--oscura {
  background-color: var(--petroleo);
  color: #EEF3F2;
}

.seccion--oscura h1,
.seccion--oscura h2,
.seccion--oscura h3,
.seccion--oscura h4 {
  color: #FBF8F1;
}

.seccion--oscura a {
  color: var(--dorado-claro);
}

.encabezado-seccion {
  max-width: 68ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.encabezado-seccion p {
  margin-bottom: 0;
}

/* Filete de hilada: separa bloques como capas de un muro */
.hilada {
  height: 10px;
  border: 0;
  margin: 0;
  background-image: repeating-linear-gradient(
    90deg,
    var(--petroleo) 0 52px,
    transparent 52px 66px
  );
  opacity: 0.28;
}

.salto {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--petroleo);
  color: #FFFDF8;
  padding: 0.7rem 1.1rem;
  border-radius: 0 0 var(--radio) 0;
  font-weight: 600;
}

.salto:focus {
  left: 0;
  color: #FFFDF8;
}

/* --- Cabecera ----------------------------------------------------------- */

.cabecera {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(247, 243, 234, 0.94);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--linea);
}

.cabecera__interior {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 84px;
}

.marca {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex: 0 0 auto;
}

.marca img {
  width: clamp(170px, 26vw, 240px);
}

.nav__lista {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__lista li {
  margin: 0;
}

.nav__lista a {
  display: inline-block;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radio);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.98rem;
  color: var(--petroleo);
  border-bottom: 2px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.nav__lista a:hover {
  background-color: rgba(31, 58, 68, 0.07);
}

.nav__lista a[aria-current="page"] {
  color: var(--petroleo);
  font-weight: 600;
  border-bottom-color: var(--dorado);
}

.menu-btn {
  display: none;
  align-items: center;
  gap: 0.55rem;
  font: inherit;
  font-weight: 600;
  color: var(--petroleo);
  background-color: transparent;
  border: 1px solid var(--linea-fuerte);
  border-radius: var(--radio);
  padding: 0.5rem 0.8rem;
  cursor: pointer;
}

.menu-btn__barras,
.menu-btn__barras::before,
.menu-btn__barras::after {
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  content: "";
}

.menu-btn__barras {
  position: relative;
}

.menu-btn__barras::before {
  position: absolute;
  top: -6px;
}

.menu-btn__barras::after {
  position: absolute;
  top: 6px;
}

/* --- Barra de progreso -------------------------------------------------- */

.barra-progreso {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background-color: var(--dorado);
  z-index: 60;
  transition: width 0.1s linear;
}

/* --- Botones ------------------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.98rem;
  line-height: 1.2;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radio);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.btn--principal {
  background-color: var(--petroleo);
  color: #FFFDF8;
  border-color: var(--petroleo);
}

.btn--principal:hover {
  background-color: var(--petroleo-2);
  color: #FFFDF8;
  transform: translateY(-1px);
}

.btn--secundario {
  background-color: transparent;
  color: var(--petroleo);
  border-color: var(--dorado);
}

.btn--secundario:hover {
  background-color: var(--dorado);
  color: #1B1408;
  transform: translateY(-1px);
}

.btn--claro {
  background-color: transparent;
  color: #FBF8F1;
  border-color: var(--linea-clara);
}

.btn--claro:hover {
  background-color: rgba(247, 243, 234, 0.12);
  color: #FBF8F1;
}

.grupo-botones {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.grupo-botones--centrado {
  justify-content: center;
}

/* --- Utilidades de alineación ------------------------------------------ */

.alinea-centro {
  align-items: center;
}

.centrado {
  text-align: center;
}

.entradilla--centrada {
  margin-inline: auto;
}

/* --- Foco visible ------------------------------------------------------- */

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--dorado);
  outline-offset: 2px;
  border-radius: 3px;
}

/* --- Portada ------------------------------------------------------------ */

.portada {
  position: relative;
  padding-block: clamp(3.5rem, 9vw, 7rem) clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.portada__friso {
  position: absolute;
  inset: 0 0 auto 0;
  height: 46px;
  background-image: url("/assets/img/friso.svg");
  background-repeat: repeat-x;
  background-position: center top;
  background-size: auto 46px;
  opacity: 0.14;
  pointer-events: none;
}

.portada__interior {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.portada__texto .entradilla {
  margin-top: 0.5rem;
}

.portada__sello {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--linea);
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--petroleo);
}

.portada__marca {
  justify-self: center;
  width: min(320px, 80%);
  filter: drop-shadow(var(--sombra));
}

/* --- Rejillas ----------------------------------------------------------- */

.rejilla {
  display: grid;
  gap: 1.25rem;
}

.rejilla--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.rejilla--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.rejilla--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* --- Tarjetas y bloques ------------------------------------------------- */

.tarjeta {
  background-color: var(--blanco);
  border: 1px solid var(--linea);
  border-radius: var(--radio);
  padding: clamp(1.35rem, 3vw, 1.9rem);
  box-shadow: var(--sombra);
}

.tarjeta p:last-child,
.tarjeta ul:last-child {
  margin-bottom: 0;
}

.pilar {
  position: relative;
  padding-top: 2.6rem;
  border-top: 3px solid var(--dorado);
}

.pilar__numero {
  position: absolute;
  top: 0.9rem;
  left: 0;
  font-family: var(--serif);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.14em;
  color: var(--dorado);
}

.pilar h3 {
  margin-bottom: 0.5rem;
}

.pilar__pregunta {
  font-style: italic;
  color: var(--petroleo);
  font-weight: 500;
  margin-bottom: 0.6rem;
}

.capa {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: clamp(1rem, 3vw, 2.25rem);
  align-items: start;
  padding-block: clamp(1.75rem, 4vw, 2.75rem);
  border-top: 1px solid var(--linea);
}

.capa:first-of-type {
  border-top: 3px solid var(--dorado);
}

.capa__indice {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 2.9rem);
  line-height: 1;
  color: var(--dorado);
}

.capa__cuerpo > :last-child {
  margin-bottom: 0;
}

.capa__etiqueta {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #5C7178;
}

.capa--base {
  background-color: rgba(182, 140, 74, 0.09);
  border-radius: var(--radio);
  padding-inline: clamp(1rem, 3vw, 1.75rem);
}

.lista-marcada {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.lista-marcada li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.65rem;
}

.lista-marcada li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.65rem;
  height: 0.65rem;
  background-color: var(--dorado);
  border-radius: 2px;
}

.pasos {
  list-style: none;
  counter-reset: paso;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.25rem;
}

.paso {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  align-items: start;
  background-color: var(--blanco);
  border: 1px solid var(--linea);
  border-left: 4px solid var(--dorado);
  border-radius: var(--radio);
  padding: clamp(1.25rem, 3vw, 1.75rem);
}

.paso__numero {
  font-family: var(--serif);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--petroleo);
  min-width: 2.2ch;
}

.paso h3 {
  margin-bottom: 0.35rem;
}

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

/* --- Destacados --------------------------------------------------------- */

.destacado {
  background-color: var(--petroleo);
  color: #EEF3F2;
  border-radius: var(--radio);
  padding: clamp(1.75rem, 4vw, 2.75rem);
}

.destacado h2,
.destacado h3 {
  color: #FBF8F1;
}

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

.destacado--borde {
  background-color: transparent;
  color: var(--tinta);
  border: 1px solid var(--linea-fuerte);
}

.destacado--borde h2,
.destacado--borde h3 {
  color: var(--petroleo);
}

.cita {
  margin: 0;
  padding-left: 1.25rem;
  border-left: 3px solid var(--dorado);
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--petroleo);
}

.cita p {
  margin: 0;
}

.cita__fuente {
  display: block;
  margin-top: 0.75rem;
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #4A626D;
}

/* --- Lista de datos ----------------------------------------------------- */

.datos {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--linea);
}

.datos li {
  display: grid;
  grid-template-columns: minmax(9rem, 0.5fr) 1fr;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--linea);
  margin: 0;
}

.datos dt,
.datos__clave {
  font-weight: 600;
  color: var(--petroleo);
}

/* --- Formulario --------------------------------------------------------- */

.form {
  display: grid;
  gap: 1.15rem;
}

.campo {
  display: grid;
  gap: 0.4rem;
}

.campo label {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--petroleo);
}

.campo input,
.campo textarea {
  font: inherit;
  color: var(--tinta);
  background-color: var(--blanco);
  border: 1px solid var(--linea-fuerte);
  border-radius: var(--radio);
  padding: 0.75rem 0.85rem;
  width: 100%;
}

.campo textarea {
  min-height: 9rem;
  resize: vertical;
}

.campo input::placeholder,
.campo textarea::placeholder {
  color: #7A8C93;
}

.aviso-demo {
  background-color: rgba(182, 140, 74, 0.12);
  border: 1px solid var(--dorado);
  border-radius: var(--radio);
  padding: 1rem 1.1rem;
  font-size: 0.95rem;
}

.aviso-demo strong {
  color: var(--petroleo);
}

.form__estado {
  margin: 0;
  font-weight: 600;
  color: var(--petroleo);
}

.form__estado[hidden] {
  display: none;
}

/* --- Pie ---------------------------------------------------------------- */

.pie {
  background-color: var(--petroleo);
  color: #DDE6E6;
  padding-top: clamp(2.5rem, 5vw, 4rem);
}

.pie a {
  color: #E8EEEE;
}

.pie a:hover {
  color: var(--dorado-claro);
}

.pie__interior {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
  padding-bottom: clamp(2rem, 4vw, 3rem);
}

.pie__logo {
  width: min(210px, 70%);
  margin-bottom: 1rem;
}

.pie__eslogan {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: #FBF8F1;
  margin: 0;
}

.pie__titulo {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dorado-claro);
  margin: 0 0 1rem;
}

.pie__nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pie__nav li {
  margin-bottom: 0.55rem;
}

.pie__nav a {
  text-decoration: none;
}

.pie__nav a:hover {
  text-decoration: underline;
}

.pie__info p {
  margin-bottom: 0.6rem;
}

.pie__creditos {
  border-top: 1px solid var(--linea-clara);
  padding-block: 1.35rem;
  font-size: 0.88rem;
  color: #C4D1D2;
}

.pie__creditos p {
  margin: 0;
}

/* --- Revelado al hacer scroll ------------------------------------------ */

.con-js .revela {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.con-js .revela.visible {
  opacity: 1;
  transform: none;
}

/* --- Accesibilidad ------------------------------------------------------ */

.visualmente-oculto {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Escritorio grande -------------------------------------------------- */

@media (max-width: 960px) {
  .rejilla--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .rejilla--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pie__interior {
    grid-template-columns: 1fr 1fr;
  }

  .pie__marca {
    grid-column: 1 / -1;
  }
}

/* --- Tableta y móvil ---------------------------------------------------- */

@media (max-width: 760px) {
  .menu-btn {
    display: inline-flex;
  }

  .portada__interior {
    grid-template-columns: 1fr;
  }

  .portada__marca {
    order: -1;
    width: min(230px, 62%);
  }

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

  .capa {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .datos li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .pie__interior {
    grid-template-columns: 1fr;
  }

  /* Menú móvil: sin JavaScript, la lista queda apilada y visible. */
  .cabecera__interior {
    flex-wrap: wrap;
    padding-block: 0.6rem;
  }

  .con-js .nav {
    flex-basis: 100%;
    display: none;
  }

  .con-js .nav.abierto {
    display: block;
    padding-bottom: 1rem;
  }

  .con-js .nav__lista {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
  }

  .con-js .nav__lista a {
    display: block;
    padding: 0.75rem 0.85rem;
    border-bottom: 1px solid var(--linea);
    border-radius: 0;
  }

  .con-js .nav__lista a[aria-current="page"] {
    border-bottom-color: var(--dorado);
    border-left: 3px solid var(--dorado);
    padding-left: 1rem;
  }
}

@media (max-width: 420px) {
  .contenedor {
    padding-inline: 1rem;
  }
}

/* --- Preferencia de movimiento reducido -------------------------------- */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .con-js .revela {
    opacity: 1;
    transform: none;
  }
}