/* =============================================================
   PetroArte — Landing Page
   Estilos propios. Identidad visual basada en imag-white.jpeg.
   Tokens de diseño en :root. No usar colores fuera de estos tokens.
   ============================================================= */

/* ---------- Tokens de diseño ---------- */
:root {
  /* Base */
  --pa-black: #0d0d0d;
  --pa-ink: #1a1a1a;
  --pa-white: #ffffff;
  --pa-paper: #f7f7f5;

  /* Primario / marca */
  --pa-blue: #0a4fd6;
  --pa-blue-deep: #062f8f;

  /* Acentos artísticos */
  --pa-red: #e2231a;
  --pa-orange: #f28c00;
  --pa-yellow: #ffd21e;
  --pa-green: #4caf2f;
  --pa-magenta: #e0338c;

  /* Elegancia editorial */
  --pa-gold: #c9a24b;

  /* Marca externa (colores oficiales, usados solo en sus iconos) */
  --pa-whatsapp: #25d366;
  --pa-instagram: linear-gradient(45deg, #f09433, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888);

  /* Texto */
  --pa-text: #14181f;
  --pa-text-muted: #5b6472;
  --pa-text-invert: #f2f4f8;

  /* Tipografía */
  --pa-font-serif: "Playfair Display", Georgia, "Times New Roman", serif;
  --pa-font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --pa-font-script: "Great Vibes", "Segoe Script", cursive;

  /* Espaciado y formas */
  --pa-radius-sm: .5rem;
  --pa-radius: .8rem;
  --pa-radius-lg: 1rem;
  --pa-shadow-sm: 0 6px 18px rgba(13, 13, 13, .06);
  --pa-shadow: 0 14px 30px rgba(10, 79, 214, .14);
  --pa-section-y: clamp(3.5rem, 7vw, 6rem);
  --pa-header-h: 76px;
}

/* ---------- Reset / base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: var(--pa-header-h); }

body {
  margin: 0;
  font-family: var(--pa-font-sans);
  color: var(--pa-text);
  background: var(--pa-paper);
  line-height: 1.65;
  overflow-x: hidden;
}

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

h1, h2, h3 { font-family: var(--pa-font-serif); line-height: 1.15; color: var(--pa-text); }

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }

p { margin: 0 0 1rem; }

a { color: var(--pa-blue); }

.container-pa { width: min(1180px, 92%); margin-inline: auto; }

.section { padding-block: var(--pa-section-y); }
.section--paper { background: var(--pa-paper); }
.section--white { background: var(--pa-white); }
/* Fondo cálido con un tinte dorado muy sutil (acento premium de marca).
   Se compone sobre el papel con el token --pa-gold a baja opacidad, sin
   introducir colores fuera de la paleta. */
.section--golden {
  background-color: var(--pa-paper);
  background-image: linear-gradient(180deg, rgba(201, 162, 75, .12), rgba(201, 162, 75, 0));
}

.section__eyebrow {
  display: inline-block;
  color: var(--pa-blue);
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-size: .8rem;
  margin-bottom: .75rem;
}

.section__title { margin: 0 0 1rem;}
.section__lead { color: var(--pa-text-muted); max-width: 60ch; text-align: justify; }
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }

/* Accesibilidad: foco visible global */
:focus-visible { outline: 3px solid var(--pa-gold); outline-offset: 2px; border-radius: 2px; }

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

/* Detalle decorativo: trazo dorado */
.brush-divider {
  width: 90px; height: 4px; border: 0; margin: 1.25rem 0 0;
  background: linear-gradient(90deg, var(--pa-gold), transparent);
  border-radius: 4px;
}
.text-center .brush-divider { margin-inline: auto; }

/* ---------- Botones ---------- */
.btn-pa {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .8rem 1.6rem;
  border-radius: var(--pa-radius-sm);
  font-weight: 600;
  font-family: var(--pa-font-sans);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform .2s ease, background-color .2s ease, color .2s ease, box-shadow .2s ease;
}
.btn-pa--primary { background: var(--pa-blue); color: var(--pa-white); }
.btn-pa--primary:hover { background: var(--pa-blue-deep); transform: translateY(-2px); }
.btn-pa--ghost { background: transparent; color: var(--pa-blue); border-color: var(--pa-blue); }
.btn-pa--ghost:hover { background: var(--pa-blue); color: var(--pa-white); }
.btn-pa--gold { background: var(--pa-gold); color: var(--pa-black); }
.btn-pa--gold:hover { background: #b88f36; transform: translateY(-2px); }
.btn-pa--light { background: var(--pa-white); color: var(--pa-blue); }
.btn-pa--light:hover { transform: translateY(-2px); }

/* ---------- Header / Navbar ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .25s ease, border-color .25s ease, background-color .25s ease;
}
.site-header.is-scrolled {
  box-shadow: 0 8px 24px rgba(13, 13, 13, .08);
  border-bottom-color: #ececec;
}
.navbar-pa { display: flex; align-items: center; justify-content: space-between; height: var(--pa-header-h); }
.brand { display: flex; align-items: center; text-decoration: none; }
.brand img { height: 62px; width: auto; display: block; }

.nav-toggle {
  display: none;
  background: none; border: 0; cursor: pointer;
  width: 44px; height: 44px; border-radius: var(--pa-radius-sm);
  color: var(--pa-black); font-size: 1.5rem;
}

.nav-menu { display: flex; align-items: center; gap: 1.6rem; list-style: none; margin: 0; padding: 0; }
.nav-link {
  color: var(--pa-text);
  text-decoration: none;
  font-weight: 500;
  padding: .35rem 0;
  position: relative;
  transition: color .2s ease;
}
.nav-link::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; background: var(--pa-blue); transition: width .25s ease;
}
.nav-link:hover, .nav-link.is-active { color: var(--pa-blue); }
.nav-link.is-active::after, .nav-link:hover::after { width: 100%; }

.nav-cta { margin-left: .4rem; }

@media (max-width: 991px) {
  .nav-toggle { display: inline-grid; place-items: center; }
  .nav-menu {
    position: absolute;
    left: 0; right: 0; top: var(--pa-header-h);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--pa-white);
    border-bottom: 1px solid #ececec;
    box-shadow: 0 12px 24px rgba(13, 13, 13, .1);
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease;
  }
  .nav-menu.is-open { max-height: 480px; }
  .nav-menu li { border-top: 1px solid #f0f0f0; }
  .nav-link { display: block; padding: .9rem 1.2rem; }
  .nav-link::after { display: none; }
  .nav-cta { margin: .8rem 1.2rem 1.2rem; }
  .nav-cta .btn-pa { width: 100%; justify-content: center; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--pa-black);
  color: var(--pa-text-invert);
  padding-block: clamp(3.5rem, 8vw, 7rem);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(60% 80% at 85% 20%, rgba(10, 79, 214, .35), transparent 60%),
    radial-gradient(50% 60% at 10% 90%, rgba(224, 51, 140, .22), transparent 60%);
  pointer-events: none;
}
.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero__eyebrow { color: var(--pa-gold); letter-spacing: .18em; text-transform: none; font-size: 1.3rem; font-weight: 700; }
.hero h1 { color: var(--pa-white); margin: .5rem 0 1rem; }
.hero__lead { color: rgba(242, 244, 248, .82); font-size: 1.1rem; max-width: 52ch; margin-bottom: 1.8rem; text-align: justify; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }
.hero__media { position: relative; }
.hero__media img {
  width: 100%;
  border-radius: var(--pa-radius-lg);
  box-shadow: 0 30px 60px rgba(0, 0, 0, .45);
}
@media (max-width: 767px) {
  .hero__grid { grid-template-columns: 1fr; text-align: center; }
  .hero__lead { margin-inline: auto; }
  .hero__actions { justify-content: center; }
}

/* ---------- Sobre el libro / autor ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
/* La imagen acompaña el scroll del texto largo, evitando el hueco en blanco. */
.about__media {
  position: sticky;
  top: calc(var(--pa-header-h) + 1.5rem);
}
.about__media img {
  width: 100%;
  border-radius: var(--pa-radius-lg);
  box-shadow: var(--pa-shadow-sm);
}
.about__list { list-style: none; padding: 0; margin: 1rem 0 0; }
.about__list li { display: flex; gap: .6rem; align-items: flex-start; margin-bottom: .6rem; color: var(--pa-text-muted); }
.about__list i { color: var(--pa-blue); margin-top: .25rem; }
@media (max-width: 767px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__media { position: static; }
}

/* ---------- Tarjetas de características ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}
@media (max-width: 991px) { .cards-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 575px) { .cards-grid { grid-template-columns: 1fr; } }

.card-pa {
  background: var(--pa-white);
  border: 1px solid #e7e9ee;
  border-radius: var(--pa-radius-lg);
  padding: 2rem;
  box-shadow: var(--pa-shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
}
.card-pa:hover { transform: translateY(-6px); box-shadow: var(--pa-shadow); }
.card-pa__icon {
  display: inline-grid; place-items: center;
  width: 56px; height: 56px; border-radius: var(--pa-radius);
  background: linear-gradient(135deg, var(--pa-blue), var(--pa-magenta));
  color: #fff; font-size: 1.5rem; margin-bottom: 1rem;
}
.card-pa__title { margin: 0 0 .5rem; }
.card-pa__text { color: var(--pa-text-muted); margin: 0; }

/* ---------- Destacados (bloque oscuro con ejes) ---------- */
.highlights { background: var(--pa-ink); color: var(--pa-text-invert); }
.highlights .section__title { color: var(--pa-white); }
.highlights .section__eyebrow { color: var(--pa-gold); }
.highlights__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2.5rem; }
@media (max-width: 767px) { .highlights__grid { grid-template-columns: 1fr; } }
.highlight {
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--pa-radius-lg);
  padding: 1.75rem;
  background: rgba(255, 255, 255, .03);
}
.highlight__num { font-family: var(--pa-font-serif); font-size: 2rem; color: var(--pa-gold); }
.highlight h3 { color: var(--pa-white); margin: .4rem 0 .5rem; }
.highlight p { color: rgba(242, 244, 248, .78); margin: 0; }

/* ---------- Galería (carrusel) ---------- */
.gallery-carousel { position: relative; margin-top: 2.5rem; }
.gallery-viewport { overflow: hidden; border-radius: var(--pa-radius); }
.gallery-track {
  display: flex;
  gap: 1rem;
  transition: transform .45s ease;
  will-change: transform;
}
/* 3 visibles en escritorio (con el gap descontado) */
.gallery-slide { flex: 0 0 calc((100% - 2rem) / 3); }
@media (max-width: 991px) { .gallery-slide { flex: 0 0 calc((100% - 1rem) / 2); } }
@media (max-width: 575px) { .gallery-slide { flex: 0 0 100%; } }

.gallery-item {
  width: 100%;
  border: 0; padding: 0; margin: 0; background: none; cursor: pointer;
  overflow: hidden; border-radius: var(--pa-radius);
  position: relative; display: block;
}

/* Controles del carrusel */
.carousel-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  z-index: 2;
  width: 48px; height: 48px; border-radius: 50%;
  border: 0; cursor: pointer;
  background: var(--pa-white); color: var(--pa-blue);
  box-shadow: 0 8px 20px rgba(13, 13, 13, .18);
  display: grid; place-items: center; font-size: 1.35rem;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}
.carousel-btn:hover { background: var(--pa-blue); color: var(--pa-white); }
.carousel-btn:disabled { opacity: .4; cursor: default; pointer-events: none; }
.carousel-btn--prev { left: -12px; }
.carousel-btn--next { right: -12px; }
@media (max-width: 575px) {
  .carousel-btn--prev { left: 6px; }
  .carousel-btn--next { right: 6px; }
}

/* Indicadores (dots) */
.carousel-dots { display: flex; justify-content: center; gap: .5rem; margin-top: 1.5rem; }
.carousel-dot {
  width: 10px; height: 10px; padding: 0; border: 0; border-radius: 50%;
  background: #cdd2db; cursor: pointer;
  transition: background .2s ease, transform .2s ease, width .2s ease;
}
.carousel-dot:hover { background: var(--pa-blue-deep); }
.carousel-dot.is-active { background: var(--pa-blue); width: 26px; border-radius: 6px; }
.gallery-item img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .35s ease; }
.gallery-item::after {
  content: "\F52A"; /* bi-zoom-in */
  font-family: "bootstrap-icons";
  position: absolute; inset: 0;
  display: grid; place-items: center;
  color: #fff; font-size: 1.8rem;
  background: rgba(13, 13, 13, .35);
  opacity: 0; transition: opacity .3s ease;
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item:hover::after, .gallery-item:focus-visible::after { opacity: 1; }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 2000;
  display: none;
  align-items: center; justify-content: center;
  background: rgba(8, 8, 8, .92);
  padding: 2rem;
}
.lightbox.is-open { display: flex; }
.lightbox__img { max-width: 90vw; max-height: 82vh; border-radius: var(--pa-radius); box-shadow: 0 20px 50px rgba(0, 0, 0, .6); }
.lightbox__caption { position: absolute; bottom: 1.2rem; left: 0; right: 0; text-align: center; color: #fff; font-size: .95rem; }
.lightbox__btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(255, 255, 255, .12); color: #fff;
  border: 0; width: 52px; height: 52px; border-radius: 50%;
  font-size: 1.5rem; cursor: pointer; transition: background .2s ease;
}
.lightbox__btn:hover { background: rgba(255, 255, 255, .25); }
.lightbox__prev { left: 1.2rem; }
.lightbox__next { right: 1.2rem; }
.lightbox__close { top: 1.2rem; right: 1.2rem; transform: none; }

/* ---------- CTA ---------- */
.cta-band {
  background: var(--pa-black);
  color: var(--pa-text-invert);
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(50% 120% at 50% 0%, rgba(10, 79, 214, .3), transparent 60%);
}
.cta-band .container-pa { position: relative; }
.cta-band__eyebrow { color: var(--pa-gold); letter-spacing: .18em; text-transform: uppercase; font-size: .85rem; font-weight: 700; }
.cta-band h2 { color: var(--pa-white); font-family: var(--pa-font-serif); }

/* ---------- Formulario de contacto ---------- */
.contact__grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
@media (max-width: 767px) { .contact__grid { grid-template-columns: 1fr; } }

.contact__info li { display: flex; gap: .7rem; align-items: center; margin-bottom: .8rem; color: var(--pa-text-muted); }
.contact__info i { color: var(--pa-blue); font-size: 1.5rem; }
.contact__info ul { list-style: none; padding: 0; margin: 1rem 0 0; }

/* Iconos de contacto por tipo (tokens de la paleta, sin estilos inline).
   Se usa .contact-icon.contact-icon--x para ganar especificidad sobre
   ".contact__info i" y pintar cada icono con su color correcto. */
.contact-icon { font-size: 1.5rem; line-height: 1; }
.contact-icon.contact-icon--mail { color: var(--pa-blue); }
.contact-icon.contact-icon--place { color: var(--pa-red); }
.contact-icon.contact-icon--whatsapp { color: var(--pa-whatsapp); }

/* Enlace de contacto con icono (correo, WhatsApp): alinea icono + texto */
.contact-link { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none; color: inherit; }
.contact-link:hover { color: var(--pa-blue); }
.contact-link:hover .contact-icon--whatsapp { filter: brightness(.92); }
.contact-link:focus-visible { outline: 3px solid var(--pa-gold); outline-offset: 2px; border-radius: 3px; }

.form-pa { background: var(--pa-white); border: 1px solid #e7e9ee; border-radius: var(--pa-radius-lg); padding: clamp(1.5rem, 4vw, 2.5rem); box-shadow: var(--pa-shadow-sm); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 575px) { .form-row { grid-template-columns: 1fr; } }
.form-group { margin-bottom: 1.1rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: .4rem; font-size: .95rem; }
.form-group .req { color: var(--pa-red); }
.form-control {
  width: 100%;
  padding: .7rem .9rem;
  border: 1px solid #cdd2db;
  border-radius: var(--pa-radius-sm);
  font: inherit; color: var(--pa-text);
  background: #fff;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.form-control:focus { border-color: var(--pa-blue); box-shadow: 0 0 0 3px rgba(10, 79, 214, .15); outline: none; }
textarea.form-control { min-height: 140px; resize: vertical; }
.form-check { display: flex; flex-wrap: wrap; gap: .5rem; align-items: flex-start; margin-bottom: 1.2rem; }
.form-check input { margin-top: .3rem; }
.form-check label { font-size: .9rem; color: var(--pa-text-muted); flex: 1; }
/* Enlace a la política de privacidad (abre el PDF en pestaña nueva) */
.policy-link { color: var(--pa-blue); text-decoration: underline; font-weight: 600; }
.policy-link:hover { color: var(--pa-blue-deep); }
.policy-link:focus-visible { outline: 3px solid var(--pa-gold); outline-offset: 2px; border-radius: 2px; }
.field-error { display: block; color: var(--pa-red); font-size: .82rem; margin-top: .3rem; min-height: 1em; }
/* Mensaje de error del checkbox: ocupa toda la línea, pegado bajo la etiqueta */
.field-error--check { flex-basis: 100%; margin-top: .1rem; }

/* Honeypot: invisible para humanos */
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-status { border-radius: var(--pa-radius-sm); padding: .9rem 1rem; margin-bottom: 1rem; font-weight: 500; display: none; }
.form-status.is-visible { display: block; }
.form-status--success { background: rgba(76, 175, 47, .12); color: #2f7d1c; border: 1px solid rgba(76, 175, 47, .4); }
.form-status--error { background: rgba(226, 35, 26, .1); color: #b21810; border: 1px solid rgba(226, 35, 26, .35); }

.btn-pa[aria-busy="true"] { opacity: .75; pointer-events: none; }

/* ---------- Footer ---------- */
.site-footer { background: var(--pa-black); color: rgba(242, 244, 248, .75); padding-block: 3rem 1.5rem; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; }
@media (max-width: 767px) { .footer__grid { grid-template-columns: 1fr; } }
.site-footer h4 { color: var(--pa-white); font-family: var(--pa-font-serif); font-size: 1.1rem; margin: 0 0 .8rem; }
.site-footer a { color: rgba(242, 244, 248, .75); text-decoration: none; }
.site-footer a:hover { color: var(--pa-gold); }
.footer__links { list-style: none; padding: 0; margin: 0; }
.footer__links li { margin-bottom: .5rem; }
.footer__brand img { width: 220px; max-width: 100%; height: auto; margin-bottom: 0; }
.footer__tagline { margin: -.9rem 0 0; color: rgba(242, 244, 248, .75); }
.footer__author { margin: .8rem 0 0; font-family: var(--pa-font-script); font-size: 1.7rem; line-height: 1.1; color: var(--pa-gold); }
.footer__bottom { border-top: 1px solid rgba(255, 255, 255, .12); margin-top: 2rem; padding-top: 1.2rem; text-align: center; font-size: .85rem; }

/* Redes sociales */
.footer__social-title { margin-top: 1.5rem; }
.footer__social { list-style: none; padding: 0; margin: 0; display: flex; gap: .75rem; }
.footer__social a {
  display: inline-grid; place-items: center;
  width: 42px; height: 42px; border-radius: 50%;
  background: rgba(255, 255, 255, .08);
  color: var(--pa-text-invert); font-size: 1.15rem;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}
.footer__social a:hover { background: var(--pa-blue); color: var(--pa-white); transform: translateY(-2px); }
.footer__social a:focus-visible { outline: 3px solid var(--pa-gold); outline-offset: 2px; }

/* Icono de Instagram con el degradado oficial de la marca.
   El degradado se aplica al propio glifo con background-clip: text. */
.footer__social .bi-instagram {
  background: var(--pa-instagram);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
/* Al pasar el cursor, el degradado pasa al fondo del círculo y el glifo se vuelve blanco */
.footer__social a:hover .bi-instagram {
  background: none;
  -webkit-text-fill-color: #fff;
  color: #fff;
}
.social--instagram:hover { background: var(--pa-instagram) !important; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}