/* =========================================================
   ISALVEN — Envolvente del edificio
   Sistema de diseño · CSS puro · industrial / constructivo
   ========================================================= */

:root {
  /* Paleta */
  --ink:        #16181d;   /* antracita casi negro */
  --graphite:   #23272f;   /* superficies oscuras */
  --steel:      #5b6470;   /* texto secundario */
  --line:       #e3e6ea;   /* bordes / separadores */
  --cloud:      #f4f6f8;   /* fondo de sección claro */
  --white:      #ffffff;
  --accent:     #e4671e;   /* naranja obra */
  --accent-dk:  #c0530f;
  --accent-soft:#fbe9dd;

  /* Tipografía */
  --font-head: 'Oswald', 'Arial Narrow', system-ui, sans-serif;
  --font-body: 'Inter', -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;

  /* Métrica */
  --maxw: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 6px;
  --shadow: 0 12px 30px -12px rgba(22, 24, 29, .18);
  --shadow-sm: 0 4px 14px -8px rgba(22, 24, 29, .22);
  --header-h: 76px;
}

/* ---------- Reset ligero ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
  font-size: 1.02rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: .2px;
  margin: 0 0 .5em;
  text-transform: uppercase;
}
p { margin: 0 0 1rem; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

/* ---------- Utilidades ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.section--cloud { background: var(--cloud); }
.section--ink { background: var(--ink); color: #d6dae0; }
.eyebrow {
  font-family: var(--font-head);
  text-transform: uppercase;
  letter-spacing: 3px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 .9rem;
  display: inline-flex;
  align-items: center;
  gap: .6rem;
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--accent); display: inline-block; }
.section-title { font-size: clamp(1.9rem, 4.5vw, 2.9rem); max-width: 20ch; }
.section-intro { color: var(--steel); max-width: 60ch; font-size: 1.08rem; }
.text-center { text-align: center; }
.text-center .eyebrow, .text-center .section-title { margin-inline: auto; }
.text-center .section-title { max-width: none; }
.text-center .section-intro { margin-inline: auto; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--font-head);
  text-transform: uppercase; letter-spacing: 1px; font-weight: 600;
  font-size: .95rem;
  padding: .85rem 1.6rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dk); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink); }
.btn--light { background: #fff; color: var(--ink); }
.btn--outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
.btn--outline-light:hover { border-color: #fff; }
.btn__arrow { font-size: 1.1em; }

/* =========================================================
   Header / navegación
   ========================================================= */
.site-header {
  position: sticky; top: 0; z-index: 60;
  height: var(--header-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem;
}
.brand { display: inline-flex; align-items: center; gap: .7rem; font-family: var(--font-head); }
.brand__mark {
  width: 40px; height: 40px; border-radius: 5px;
  background: var(--ink); color: var(--accent);
  display: grid; place-items: center;
  font-weight: 700; font-size: 1.25rem; letter-spacing: -1px;
}
.brand__name { font-size: 1.4rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }
.brand__name span { color: var(--accent); }

.nav__menu { display: flex; align-items: center; gap: .35rem; }
.nav__link {
  font-family: var(--font-head);
  text-transform: uppercase; letter-spacing: .6px;
  font-size: .95rem; font-weight: 500;
  padding: .5rem .85rem; border-radius: 4px;
  color: var(--graphite);
  transition: color .15s ease, background .15s ease;
}
.nav__link:hover { color: var(--accent); }
.nav__cta { margin-left: .6rem; }

.nav__toggle {
  display: none;
  width: 46px; height: 46px;
  border: 1px solid var(--line); border-radius: 6px;
  background: #fff; cursor: pointer;
  padding: 0;
}
.nav__toggle span, .nav__toggle span::before, .nav__toggle span::after {
  content: ""; display: block; width: 22px; height: 2px; background: var(--ink);
  margin-inline: auto; position: relative; transition: transform .25s ease, opacity .2s ease;
}
.nav__toggle span::before { position: absolute; top: -7px; }
.nav__toggle span::after  { position: absolute; top:  7px; }
.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { transform: translateY(7px) rotate(45deg); }
.nav.is-open .nav__toggle span::after  { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative;
  min-height: min(88vh, 760px);
  display: flex; align-items: center;
  color: #fff;
  overflow: hidden;
  background: var(--ink);
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    linear-gradient(115deg, rgba(16,18,22,.92) 0%, rgba(16,18,22,.72) 45%, rgba(16,18,22,.45) 100%),
    /* patrón de "fachada" como marcador hasta que haya foto real */
    repeating-linear-gradient(90deg, #2c313a 0 78px, #262a32 78px 80px),
    repeating-linear-gradient(0deg,  #2c313a 0 118px, #23272f 118px 120px),
    var(--graphite);
  background-blend-mode: normal, overlay, overlay, normal;
}
.hero__inner { position: relative; z-index: 2; padding-block: 4rem; }
.hero .eyebrow { color: #ffb787; }
.hero .eyebrow::before { background: var(--accent); }
.hero__title {
  font-size: clamp(2.4rem, 6.2vw, 4.4rem);
  max-width: 16ch; margin-bottom: .4em;
}
.hero__title em { color: var(--accent); font-style: normal; }
.hero__subtitle {
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  max-width: 52ch; color: #c8cdd5; margin-bottom: 2rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: .9rem; }
.hero__stats {
  display: flex; flex-wrap: wrap; gap: clamp(1.5rem, 5vw, 3.5rem);
  margin-top: 3rem; padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,.14);
}
.stat__num { font-family: var(--font-head); font-size: 2.2rem; font-weight: 600; color: #fff; line-height: 1; }
.stat__num span { color: var(--accent); }
.stat__label { font-size: .9rem; color: #aab1bb; text-transform: uppercase; letter-spacing: 1px; margin-top: .35rem; }

/* =========================================================
   Servicios
   ========================================================= */
.grid-services { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 3rem; }
.service-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2.2rem 1.9rem;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--accent); transform: scaleY(0); transform-origin: top; transition: transform .25s ease;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.service-card:hover::before { transform: scaleY(1); }
.service-card__icon {
  width: 58px; height: 58px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-dk);
  display: grid; place-items: center; margin-bottom: 1.3rem;
}
.service-card__icon svg { width: 30px; height: 30px; }
.service-card h3 { font-size: 1.35rem; }
.service-card p { color: var(--steel); font-size: .98rem; margin-bottom: 0; }
.service-card__more {
  display: inline-flex; align-items: center; gap: .4rem;
  margin-top: 1.2rem; font-family: var(--font-head); text-transform: uppercase;
  font-size: .85rem; letter-spacing: 1px; color: var(--accent);
}

/* =========================================================
   Sobre nosotros
   ========================================================= */
.about { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(2rem, 6vw, 4.5rem); align-items: center; }
.about__media {
  position: relative; border-radius: var(--radius); overflow: hidden;
  min-height: 420px;
  background:
    linear-gradient(160deg, rgba(228,103,30,.10), transparent 60%),
    repeating-linear-gradient(135deg, #dfe3e8 0 22px, #e9edf1 22px 44px),
    var(--cloud);
  border: 1px solid var(--line);
  display: grid; place-items: center;
}
.about__media-note {
  font-family: var(--font-head); text-transform: uppercase; letter-spacing: 1px;
  color: var(--steel); font-size: .85rem; text-align: center; padding: 1rem;
}
.about__badge {
  position: absolute; right: -14px; bottom: 28px;
  background: var(--ink); color: #fff; padding: 1.1rem 1.4rem; border-radius: var(--radius);
  box-shadow: var(--shadow); max-width: 200px;
}
.about__badge strong { color: var(--accent); font-family: var(--font-head); font-size: 1.6rem; display: block; }
.feature-list { margin-top: 1.5rem; display: grid; gap: 1rem; }
.feature-list li { display: flex; gap: .85rem; align-items: flex-start; }
.feature-list .tick {
  flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent-dk);
  display: grid; place-items: center; font-weight: 700; font-size: .9rem;
}
.feature-list strong { display: block; }
.feature-list span { color: var(--steel); font-size: .95rem; }

/* =========================================================
   Proyectos / galería
   ========================================================= */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; margin-top: 3rem; }
.gallery__item {
  position: relative; aspect-ratio: 4/3; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, rgba(35,39,47,.05), rgba(228,103,30,.06)),
    repeating-linear-gradient(45deg, #e7ebef 0 16px, #eef1f4 16px 32px);
  display: grid; place-items: end start;
}
.gallery__item:nth-child(4n) { aspect-ratio: 8/7; }
.gallery__tag {
  margin: 1rem; background: rgba(22,24,29,.82); color: #fff;
  font-family: var(--font-head); text-transform: uppercase; letter-spacing: 1px;
  font-size: .78rem; padding: .4rem .8rem; border-radius: 4px;
}
.gallery__note { margin-top: 1.8rem; color: var(--steel); font-size: .95rem; text-align: center; }

/* =========================================================
   CTA franja
   ========================================================= */
.cta-band { text-align: center; }
.cta-band h2 { font-size: clamp(1.8rem, 4.5vw, 2.8rem); color: #fff; }
.cta-band p { color: #b9bfc8; max-width: 52ch; margin-inline: auto; margin-bottom: 1.8rem; }
.cta-band .hero__actions { justify-content: center; }

/* =========================================================
   Contacto
   ========================================================= */
.contact { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(2rem, 6vw, 4rem); align-items: start; }
.contact__info h3 { font-size: 1.5rem; }
.contact-detail { display: flex; gap: 1rem; align-items: flex-start; margin-bottom: 1.4rem; }
.contact-detail__icon {
  flex: 0 0 auto; width: 46px; height: 46px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-dk); display: grid; place-items: center;
}
.contact-detail__icon svg { width: 22px; height: 22px; }
.contact-detail__label { font-family: var(--font-head); text-transform: uppercase; letter-spacing: 1px; font-size: .78rem; color: var(--steel); }
.contact-detail__value { font-size: 1.05rem; font-weight: 500; }
.contact-detail__value a:hover { color: var(--accent); }

.contact-form {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.6rem, 4vw, 2.4rem); box-shadow: var(--shadow-sm);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field { margin-bottom: 1.1rem; }
.field label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: .4rem; font-family: var(--font-head); text-transform: uppercase; letter-spacing: .5px; }
.field .req { color: var(--accent); }
.field input, .field textarea {
  width: 100%; padding: .8rem .95rem; font: inherit; font-size: .98rem;
  border: 1px solid var(--line); border-radius: 5px; background: var(--white);
  color: var(--ink); transition: border-color .15s ease, box-shadow .15s ease;
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.field textarea { resize: vertical; min-height: 120px; }
.form-consent { display: flex; gap: .6rem; align-items: flex-start; font-size: .85rem; color: var(--steel); margin-bottom: 1.2rem; }
.form-consent input { margin-top: .25rem; accent-color: var(--accent); }
.form-consent a { color: var(--accent); text-decoration: underline; }
.form-note { font-size: .82rem; color: var(--steel); margin-top: 1rem; }
.form-status { display: none; margin-top: 1rem; padding: .8rem 1rem; border-radius: 5px; font-size: .92rem; }
.form-status.is-ok  { display: block; background: #e7f6ec; color: #1f7a45; }
.form-status.is-err { display: block; background: #fdeaea; color: #b3261e; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer { background: var(--ink); color: #aeb4bd; padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; }
.site-footer .brand__name { color: #fff; }
.site-footer p { color: #9aa1ab; max-width: 34ch; }
.footer-col h4 { color: #fff; font-size: 1rem; letter-spacing: 1px; margin-bottom: 1rem; }
.footer-col a { display: block; padding: .3rem 0; color: #aeb4bd; transition: color .15s ease; }
.footer-col a:hover { color: var(--accent); }
.footer-social { display: flex; gap: .7rem; margin-top: 1.2rem; }
.footer-social a {
  width: 40px; height: 40px; border-radius: 8px; border: 1px solid rgba(255,255,255,.14);
  display: grid; place-items: center; color: #fff;
}
.footer-social a:hover { background: var(--accent); border-color: var(--accent); }
.footer-social svg { width: 20px; height: 20px; }
.footer-bottom {
  margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; flex-wrap: wrap; gap: .6rem 1.5rem; justify-content: space-between; align-items: center;
  font-size: .85rem; color: #7c838d;
}
.footer-bottom a:hover { color: var(--accent); }

/* =========================================================
   Cookie banner
   ========================================================= */
.cookie-banner {
  position: fixed; z-index: 90; left: 50%; bottom: 20px; transform: translateX(-50%);
  width: min(680px, calc(100% - 2rem));
  background: var(--white); border: 1px solid var(--line);
  box-shadow: var(--shadow); border-radius: var(--radius);
  padding: 1.2rem 1.4rem; display: none;
}
.cookie-banner.is-visible { display: block; }
.cookie-banner p { font-size: .9rem; color: var(--steel); margin-bottom: 1rem; }
.cookie-banner a { color: var(--accent); text-decoration: underline; }
.cookie-actions { display: flex; flex-wrap: wrap; gap: .7rem; }
.cookie-actions .btn { padding: .6rem 1.2rem; font-size: .85rem; }

/* =========================================================
   Páginas legales
   ========================================================= */
.legal-hero { background: var(--ink); color: #fff; padding-block: clamp(3rem, 7vw, 4.5rem); }
.legal-hero h1 { font-size: clamp(2rem, 5vw, 3rem); }
.legal-hero p { color: #b9bfc8; margin: 0; }
.legal-body { padding-block: clamp(2.5rem, 6vw, 4rem); }
.legal-body .container { max-width: 820px; }
.legal-body h2 { font-size: 1.4rem; margin-top: 2.2rem; color: var(--ink); }
.legal-body h3 { font-size: 1.1rem; margin-top: 1.5rem; text-transform: none; letter-spacing: 0; }
.legal-body p, .legal-body li { color: var(--graphite); }
.legal-body ul { list-style: disc; padding-left: 1.4rem; margin-bottom: 1rem; }
.legal-body li { margin-bottom: .4rem; }
.legal-body a { color: var(--accent-dk); text-decoration: underline; }
.legal-placeholder {
  background: var(--accent-soft); border: 1px dashed var(--accent);
  color: var(--accent-dk); padding: .35em .6em; border-radius: 4px; font-weight: 600;
}
.legal-note {
  background: #fff8f2; border-left: 4px solid var(--accent);
  padding: 1rem 1.2rem; border-radius: 0 var(--radius) var(--radius) 0; margin-bottom: 2rem; font-size: .95rem;
}

/* =========================================================
   Animación 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) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 940px) {
  .grid-services { grid-template-columns: 1fr 1fr; }
  .about { grid-template-columns: 1fr; }
  .about__media { min-height: 300px; }
  .contact { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 780px) {
  .nav__menu {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; align-items: stretch;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 1rem var(--gutter) 1.5rem; gap: .2rem;
    box-shadow: var(--shadow); transform: translateY(-120%);
    transition: transform .28s ease; visibility: hidden;
  }
  .nav.is-open .nav__menu { transform: translateY(0); visibility: visible; }
  .nav__link { padding: .8rem .4rem; border-bottom: 1px solid var(--line); }
  .nav__cta { margin: .8rem 0 0; }
  .nav__cta .btn { width: 100%; justify-content: center; }
  .nav__toggle { display: block; }
}
@media (max-width: 620px) {
  .grid-services { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .hero__stats { gap: 1.4rem 2rem; }
  .stat__num { font-size: 1.8rem; }
}