/*
  MODULAR TRES — Sistema de diseño
  Paleta "Piedra & Terracota": neutros cálidos de piedra mediterránea + terracota
  profunda como marca + naranja cálido como acento. Tipografía Playfair Display
  (display) + Work Sans (texto).
*/

:root {
  /* ---- Color: base neutra (piedra) ---- */
  --stone-50: #FAF8F4;
  --stone-100: #F3EFE7;
  --stone-200: #E7E0D3;
  --stone-300: #D2C7B4;
  --stone-400: #A99C86;
  --stone-500: #7C7263;
  --stone-600: #5A5347;
  --stone-700: #3E392F;
  --stone-800: #2A2621;
  --stone-900: #1B1815;

  /* ---- Color: terracota (marca / fondos oscuros) ---- */
  --rust-100: #F7E3D2;
  --rust-300: #E3A06B;
  --rust-500: #A8461C;
  --rust-600: #833819;
  --rust-700: #3B2116;

  /* ---- Color: naranja cálido (acento / CTA) ---- */
  --amber-300: #F5C08A;
  --amber-500: #C64916;
  --amber-600: #A83B10;

  /* ---- Color: marrón cálido (alterna con el naranja en iconos/acentos repetidos) ---- */
  --cocoa-100: #E8DACB;
  --cocoa-300: #C9A382;
  --cocoa-500: #6B4226;

  /* ---- Tokens semánticos ---- */
  --color-bg: var(--stone-50);
  --color-surface: #FFFFFF;
  --color-surface-alt: var(--stone-100);
  --color-ink: var(--stone-900);
  --color-ink-soft: var(--stone-600);
  --color-border: var(--stone-200);
  --color-primary: var(--rust-500);
  --color-primary-strong: var(--rust-600);
  --color-primary-soft: var(--rust-100);
  --color-accent: var(--amber-500);
  --color-accent-strong: var(--amber-600);
  --color-on-primary: #FFFFFF;
  --color-on-dark: var(--stone-100);
  --color-focus: #2E6FE0;

  /* ---- Tipografía ---- */
  --font-display: "Playfair Display", "Iowan Old Style", Georgia, serif;
  --font-body: "Work Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --fs-xs: clamp(0.8rem, 0.78rem + 0.1vw, 0.875rem);
  --fs-sm: clamp(0.9rem, 0.88rem + 0.1vw, 1rem);
  --fs-base: clamp(1rem, 0.97rem + 0.15vw, 1.125rem);
  --fs-md: clamp(1.15rem, 1.1rem + 0.25vw, 1.375rem);
  --fs-lg: clamp(1.4rem, 1.3rem + 0.5vw, 1.875rem);
  --fs-xl: clamp(1.9rem, 1.6rem + 1.3vw, 2.75rem);
  --fs-2xl: clamp(2.4rem, 1.9rem + 2.2vw, 3.75rem);
  --fs-3xl: clamp(3rem, 2.2rem + 3.6vw, 5.25rem);

  /* ---- Espaciado (ritmo 4/8) ---- */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4.5rem;
  --sp-9: 6.5rem;
  --sp-10: 9rem;

  --container-max: 1320px;
  --container-pad: clamp(1.25rem, 4vw, 3rem);

  --radius-sm: 6px;
  --radius-md: 14px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(27, 24, 21, 0.06), 0 1px 1px rgba(27, 24, 21, 0.04);
  --shadow-md: 0 12px 24px -8px rgba(27, 24, 21, 0.16);
  --shadow-lg: 0 24px 48px -12px rgba(27, 24, 21, 0.22);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 180ms;
  --dur-base: 320ms;
  --dur-slow: 700ms;

  --header-h: 84px;
}

/* ---------------- Reset ---------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html {
  color-scheme: light;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
  font-display: swap;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, picture, svg, video { display: block; max-width: 100%; }
img { height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.12; letter-spacing: -0.01em; text-wrap: balance; }
p { text-wrap: pretty; }

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

@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;
  }
}

/* ---------------- Layout helpers ---------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}
.section { padding-block: var(--sp-9); }
.section--tight { padding-block: var(--sp-7); }
.section--surface { background: var(--color-surface); }
.section--alt { background: var(--color-surface-alt); }
.section--dark {
  background: var(--rust-700);
  color: var(--color-on-dark);
}
.section--dark h2, .section--dark h3 { color: #fff; }

.grid { display: grid; gap: var(--sp-6); }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-accent);
  display: inline-block;
}
.section--dark .eyebrow { color: var(--amber-300); }

.section-head {
  max-width: 46rem;
  margin-bottom: var(--sp-7);
}
.section-head h2 { font-size: var(--fs-2xl); margin-top: var(--sp-3); }
.section-head p { margin-top: var(--sp-4); color: var(--color-ink-soft); font-size: var(--fs-md); }
.section--dark .section-head p { color: var(--stone-300); }

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

.skip-link {
  position: fixed;
  top: -60px; left: var(--sp-4);
  background: var(--color-primary);
  color: #fff;
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-base) var(--ease-out);
}
.skip-link:focus { top: var(--sp-4); }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 48px;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--fs-sm);
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out), background var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
  white-space: nowrap;
  touch-action: manipulation;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-strong); }
.btn-outline { background: transparent; border-color: currentColor; color: var(--color-ink); }
.btn-outline:hover { background: var(--color-ink); color: #fff; }
.section--dark .btn-outline { color: #fff; }
.section--dark .btn-outline:hover { background: #fff; color: var(--rust-700); }
.btn-ghost { background: rgba(255,255,255,0.12); color: #fff; border-color: rgba(255,255,255,0.3); backdrop-filter: blur(6px); }
.btn-ghost:hover { background: rgba(255,255,255,0.22); }
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ---------------- Header ---------------- */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-base) var(--ease-out), height var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.site-header .container { display: flex; align-items: center; gap: var(--sp-6); width: 100%; }
.site-header::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(27,24,21,0.45), rgba(27,24,21,0));
  opacity: 1;
  transition: opacity var(--dur-base) var(--ease-out);
  z-index: -1;
}
.site-header.is-scrolled {
  height: 72px;
  background: rgba(250, 248, 244, 0.88);
  backdrop-filter: blur(10px) saturate(1.4);
  box-shadow: var(--shadow-sm);
}
.site-header.is-scrolled::before { opacity: 0; }
.site-header.is-scrolled .main-nav a,
.site-header.is-scrolled .lang-switch { color: var(--color-ink); }
.site-header.is-scrolled .btn-outline { color: var(--color-ink); }

.logo { display: flex; align-items: center; flex-shrink: 0; }
.logo-img { display: block; height: 20px; width: auto; max-width: 160px; }
.logo-img--dark { display: none; }
.site-header.is-scrolled .logo-img--light { display: none; }
.site-header.is-scrolled .logo-img--dark { display: block; }

.main-nav { display: none; flex-shrink: 0; }
.main-nav ul { display: flex; gap: clamp(0.75rem, 1.4vw, 1.5rem); align-items: center; }
.main-nav a {
  display: inline-block;
  white-space: nowrap;
  color: #fff;
  font-size: clamp(0.8rem, 0.75vw + 0.6rem, 0.9375rem);
  font-weight: 500;
  position: relative;
  padding-block: var(--sp-2);
  transition: color var(--dur-base) var(--ease-out);
}
.logo, .header-actions { flex-shrink: 0; }
.header-actions { margin-left: auto; }
.main-nav a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: -2px;
  height: 2px; background: var(--color-accent);
  transition: right var(--dur-base) var(--ease-out);
}
.main-nav a:hover::after, .main-nav a[aria-current="page"]::after { right: 0; }
.main-nav a[aria-current="page"] { font-weight: 600; }

/* Desplegable "Obra residencial" */
.main-nav li { position: relative; }
.has-dropdown { display: flex; align-items: center; gap: var(--sp-1); }
.dropdown-toggle {
  background: none; border: none; color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  transition: color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.site-header.is-scrolled .dropdown-toggle { color: var(--color-ink); }
.dropdown-toggle svg { width: 16px; height: 16px; }
.has-dropdown.is-open .dropdown-toggle { transform: rotate(180deg); }
.dropdown-panel {
  position: absolute;
  top: calc(100% + var(--sp-4));
  left: 50%;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-5);
  display: flex; gap: var(--sp-6);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility var(--dur-base);
}
.has-dropdown:hover .dropdown-panel,
.has-dropdown.is-open .dropdown-panel {
  opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0);
}
.dropdown-group { display: flex; flex-direction: column; gap: var(--sp-1); min-width: 180px; }
.dropdown-group + .dropdown-group { border-left: 1px solid var(--color-border); padding-left: var(--sp-6); }
.dropdown-group-title {
  font-size: var(--fs-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--color-ink-soft); padding: var(--sp-2) var(--sp-4); margin-bottom: var(--sp-1);
}
.dropdown-panel a {
  color: var(--color-ink) !important;
  font-weight: 500;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease-out);
}
.dropdown-panel a:hover, .dropdown-panel a:focus-visible { background: var(--stone-100); }
.dropdown-panel a::after { display: none; }

.header-actions { display: flex; align-items: center; gap: var(--sp-4); }
@media (max-width: 1179px), (min-width: 1180px) and (max-width: 1499px) {
  .header-actions .btn-primary { display: none; }
}

.nav-toggle {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 48px; height: 48px;
  background: none; border: none;
  color: #fff;
  transition: color var(--dur-base) var(--ease-out);
}
.site-header.is-scrolled .nav-toggle { color: var(--color-ink); }
.nav-toggle svg { width: 26px; height: 26px; }
.nav-toggle .icon-close { display: none; }
.nav-open .nav-toggle .icon-menu { display: none; }
.nav-open .nav-toggle .icon-close { display: block; }

@media (min-width: 1180px) {
  .main-nav { display: block; }
  .nav-toggle { display: none; }
}

/* Mobile nav drawer */
.mobile-nav {
  position: fixed; inset: 0;
  background: var(--rust-700);
  z-index: 90;
  display: flex; flex-direction: column;
  justify-content: flex-start;
  overflow-y: auto;
  padding: calc(var(--header-h) + var(--sp-6)) var(--container-pad) var(--sp-8);
  transform: translateY(-100%);
  transition: transform var(--dur-slow) var(--ease-in-out);
}
.nav-open .mobile-nav { transform: translateY(0); }
.mobile-nav ul { display: flex; flex-direction: column; gap: var(--sp-5); }
.mobile-nav a { font-family: var(--font-display); font-size: var(--fs-xl); color: #fff; }
.mobile-nav .btn { margin-top: var(--sp-7); align-self: flex-start; }

.mobile-dropdown summary {
  list-style: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3);
  font-family: var(--font-display); font-size: var(--fs-xl); color: #fff;
}
.mobile-dropdown summary::-webkit-details-marker { display: none; }
.mobile-dropdown summary svg { width: 22px; height: 22px; flex-shrink: 0; transition: transform var(--dur-base) var(--ease-out); }
.mobile-dropdown[open] summary svg { transform: rotate(180deg); }
.mobile-dropdown .sub-links { display: flex; flex-direction: column; gap: var(--sp-3); margin-top: var(--sp-4); padding-left: var(--sp-4); border-left: 1px solid rgba(255,255,255,0.2); }
.mobile-dropdown .sub-links a { font-family: var(--font-body); font-size: var(--fs-md); font-weight: 500; color: var(--stone-300); }
.mobile-dropdown .sub-links-title { font-family: var(--font-body); font-size: var(--fs-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--stone-400); margin-top: var(--sp-3); }
.mobile-dropdown .sub-links-title:first-child { margin-top: 0; }
@media (min-width: 1180px) { .mobile-nav { display: none; } }
body.nav-open { overflow: hidden; }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  color: #fff;
  overflow: hidden;
}
.hero-media {
  position: absolute; inset: 0;
  z-index: -2;
  background: linear-gradient(160deg, var(--stone-700), var(--rust-700) 60%, var(--stone-900));
}
.hero-media img {
  width: 100%; height: 100%; object-fit: cover;
  position: absolute; inset: 0;
}
.hero-media::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(20,19,16,0.35) 0%, rgba(20,19,16,0.25) 40%, rgba(17,16,13,0.86) 100%);
}
.hero-content {
  padding-block: calc(var(--header-h) + var(--sp-8)) var(--sp-9);
  max-width: 56rem;
}
.hero-content .eyebrow { color: var(--amber-300); }
.hero h1 {
  font-size: var(--fs-3xl);
  margin-top: var(--sp-4);
}
.hero h1 em { font-style: italic; color: var(--amber-300); }
.hero p.lede {
  margin-top: var(--sp-5);
  font-size: var(--fs-md);
  max-width: 40rem;
  color: var(--stone-200);
}
.hero-actions {
  margin-top: var(--sp-7);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
}
.hero-stats {
  margin-top: var(--sp-9);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-5);
  border-top: 1px solid rgba(255,255,255,0.18);
  padding-top: var(--sp-6);
}
@media (min-width: 720px) {
  .hero-stats { grid-template-columns: repeat(4, 1fr); }
}
.stat-num {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  color: #fff;
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.stat-label { font-size: var(--fs-xs); color: var(--stone-300); margin-top: var(--sp-1); }

.scroll-cue {
  position: absolute; bottom: var(--sp-6); left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: var(--sp-2);
  color: var(--stone-200);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.scroll-cue .line { width: 1px; height: 36px; background: linear-gradient(to bottom, currentColor, transparent); animation: scrollcue 2.2s var(--ease-in-out) infinite; }
@keyframes scrollcue { 0% { transform: scaleY(0); transform-origin: top; } 50% { transform: scaleY(1); transform-origin: top; } 50.01% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------------- Reveal animations ---------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: transform, opacity;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
  will-change: auto;
}
[data-reveal="scale"] { transform: scale(0.94); }
[data-reveal="scale"].is-visible { transform: scale(1); }
[data-reveal="left"] { transform: translateX(-32px); }
[data-reveal="left"].is-visible { transform: translateX(0); }
[data-reveal="right"] { transform: translateX(32px); }
[data-reveal="right"].is-visible { transform: translateX(0); }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------------- Cards & components ---------------- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }

/* Fichas detalladas de sistema constructivo */
.systems-list { display: grid; gap: var(--sp-6); }
.system-detail {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
}
.system-body { padding: var(--sp-7); }
.system-media { order: -1; min-height: 220px; background: var(--stone-100); }
.system-media img, .system-media video { width: 100%; height: 100%; object-fit: cover; display: block; }
@media (min-width: 860px) {
  .system-detail { grid-template-columns: 1fr 360px; align-items: stretch; }
  .system-media { order: 0; }
}
.system-badge {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  background: var(--color-accent); color: #fff;
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.04em;
  padding: var(--sp-2) var(--sp-4); border-radius: var(--radius-pill);
  margin-bottom: var(--sp-4);
}
.system-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--sp-3); }
.system-head h3 { font-size: var(--fs-lg); }
.system-alt { font-family: var(--font-body); font-size: var(--fs-sm); font-weight: 500; color: var(--color-ink-soft); }
.system-price { font-family: var(--font-display); font-size: var(--fs-md); color: var(--color-primary); white-space: nowrap; }
.system-desc { margin-top: var(--sp-4); color: var(--color-ink-soft); font-size: var(--fs-md); max-width: 60rem; }

.system-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: var(--sp-4); margin-top: var(--sp-6); }
.system-stat { font-size: var(--fs-sm); }
.system-stat .label { display: block; color: var(--color-ink-soft); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: var(--sp-1); }
.system-stat .stars { color: var(--color-accent); letter-spacing: 2px; }
.system-stat .stars .is-empty { opacity: 0.25; }

.system-pros-cons { display: grid; gap: var(--sp-5); margin-top: var(--sp-6); }
@media (min-width: 720px) { .system-pros-cons { grid-template-columns: 1fr 1fr; } }
.system-pros-cons h4 { font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: var(--sp-2); }
.system-pros-cons ul { display: grid; gap: var(--sp-2); font-size: var(--fs-sm); color: var(--color-ink-soft); }
.system-pros-cons li { padding-left: var(--sp-4); position: relative; }
.system-pros-cons li::before { content: "+"; position: absolute; left: 0; font-weight: 700; color: var(--color-primary); }
.system-pros-cons .cons li::before { content: "–"; color: var(--stone-500); }
.system-personalizacion { margin-top: var(--sp-5); font-size: var(--fs-sm); color: var(--color-ink-soft); }
.system-personalizacion strong { color: var(--color-ink); }

.services-grid { grid-template-columns: 1fr; }
@media (min-width: 720px) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .services-grid { grid-template-columns: repeat(3, 1fr); } }

.service-card { padding: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-4); height: 100%; }
.service-card .icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
}
.service-card .icon svg { width: 26px; height: 26px; }
.service-card:nth-child(even) .icon { background: var(--cocoa-100); color: var(--cocoa-500); }
.service-card h3 { font-size: var(--fs-md); }
.service-card p { color: var(--color-ink-soft); font-size: var(--fs-sm); }
.service-card .tag-link { margin-top: auto; font-weight: 600; font-size: var(--fs-sm); color: var(--color-primary); display: inline-flex; align-items: center; gap: var(--sp-2); }
.service-card .tag-link svg { width: 16px; height: 16px; transition: transform var(--dur-fast) var(--ease-out); }
.service-card:hover .tag-link svg { transform: translateX(4px); }

/* Process / Sistema constructivo */
.process-list { counter-reset: step; display: grid; gap: 0; }
.process-item {
  counter-increment: step;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--sp-5);
  padding-block: var(--sp-6);
  border-top: 1px solid var(--color-border);
}
.process-item:last-child { border-bottom: 1px solid var(--color-border); }
.process-item::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  color: var(--color-accent);
}
.process-item h3 { font-size: var(--fs-md); margin-bottom: var(--sp-2); }
.process-item p { color: var(--color-ink-soft); }
.process-item .process-meta { white-space: nowrap; }
@media (min-width: 720px) {
  .process-item { grid-template-columns: 120px 90px 1fr; align-items: start; }
  .process-item .process-meta { font-size: var(--fs-xs); color: var(--color-ink-soft); text-transform: uppercase; letter-spacing: 0.08em; padding-top: var(--sp-1); }
}

/* Placeholder de imagen (sustituir por <img> real, ver comentarios HTML) */
.ph-media {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--sp-3);
  background: linear-gradient(135deg, var(--stone-200), var(--stone-300));
  color: var(--stone-500);
  text-align: center;
  padding: var(--sp-5);
}
.ph-media svg { width: 44px; height: 44px; opacity: 0.55; }
.ph-media span { font-size: var(--fs-xs); max-width: 80%; line-height: 1.4; }
.media-frame .ph-media, .project-card .ph-media { position: absolute; }

/* Gallery / proyectos */
.gallery-grid { grid-template-columns: 1fr; }
@media (min-width: 720px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
.project-card { position: relative; border-radius: var(--radius-md); overflow: hidden; aspect-ratio: 4/5; background: var(--stone-300); }
.project-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 900ms var(--ease-out); }
.project-card:hover img { transform: scale(1.06); }
.project-card .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(20,19,16,0) 45%, rgba(20,19,16,0.88) 100%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: var(--sp-5); color: #fff;
}
.project-card .overlay .place { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.08em; color: var(--amber-300); }
.project-card .overlay h3 { font-size: var(--fs-md); margin-top: var(--sp-1); }
.project-card .overlay .meta { margin-top: var(--sp-2); font-size: var(--fs-xs); color: var(--stone-300); display: flex; gap: var(--sp-3); flex-wrap: wrap; }
.project-card .overlay p:not(.meta) { margin-top: var(--sp-2); font-size: var(--fs-sm); color: var(--stone-200); }

/* Rentabilidad (ROI) */
.roi-grid { grid-template-columns: 1fr; gap: var(--sp-5); }
@media (min-width: 640px) { .roi-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .roi-grid { grid-template-columns: repeat(4, 1fr); } }
.roi-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-md);
  padding: var(--sp-6);
}
.roi-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(245, 192, 138, 0.16);
  color: var(--amber-300);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--sp-4);
}
.roi-icon svg { width: 24px; height: 24px; }
.roi-card:nth-child(even) .roi-icon { background: rgba(201, 163, 130, 0.18); color: var(--cocoa-300); }
.roi-num {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  color: #fff;
  display: flex; align-items: baseline; gap: 2px;
}
.roi-label { font-size: var(--fs-md); font-weight: 600; color: #fff; margin-top: var(--sp-2); }
.roi-desc { font-size: var(--fs-sm); color: var(--stone-300); margin-top: var(--sp-3); }
.roi-disclaimer { margin-top: var(--sp-7); font-size: var(--fs-xs); color: var(--stone-400); max-width: 52rem; }

.render-tag {
  position: absolute;
  top: var(--sp-4); left: var(--sp-4);
  z-index: 1;
  background: rgba(59, 33, 22, 0.85);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-pill);
}

/* CTA card: ocupa el hueco de un render/proyecto que todavía no existe */
.cta-card {
  background: linear-gradient(140deg, var(--rust-700), var(--rust-500));
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: var(--sp-3);
  padding: var(--sp-7);
}
.cta-card .roi-icon { background: rgba(245, 192, 138, 0.18); }
.cta-card h3 { font-size: var(--fs-lg); color: #fff; }
.cta-card p { font-size: var(--fs-sm); color: var(--stone-300); max-width: 32rem; }
.cta-card .btn { margin-top: var(--sp-2); }
@media (min-width: 1100px) { .cta-card { grid-column: span 2; } }

/* Catálogo de modelos (Modelos Modular 3) */
.models-grid { grid-template-columns: 1fr; }
@media (min-width: 640px) { .models-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .models-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1300px) { .models-grid { grid-template-columns: repeat(4, 1fr); } }
.model-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.model-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.model-media { position: relative; aspect-ratio: 4 / 3; background: var(--stone-200); overflow: hidden; }
.model-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 700ms var(--ease-out); }
.model-card:hover .model-media img { transform: scale(1.05); }
.model-body { padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2); flex: 1; }
.model-code { font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-primary); }
.model-card h3 { font-size: var(--fs-md); }
.model-card p { font-size: var(--fs-sm); color: var(--color-ink-soft); }

.model-card.is-placeholder { background: var(--stone-100); }
.model-card.is-placeholder .model-media { display: flex; align-items: center; justify-content: center; color: var(--stone-400); }
.model-card.is-placeholder .model-media svg { width: 36px; height: 36px; }
.model-card.is-placeholder .model-code { color: var(--stone-400); }
.model-card.is-placeholder h3, .model-card.is-placeholder p { color: var(--stone-400); }

/* Zonas de trabajo */
.zone-list { display: flex; flex-wrap: wrap; gap: var(--sp-3); }
.zone-chip {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm); font-weight: 500;
  background: var(--color-surface);
}
.zone-chip svg { width: 16px; height: 16px; color: var(--color-accent); }

/* FAQ (accordion, no JS required for basic function via <details>) */
.faq-list { border-top: 1px solid var(--color-border); }
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4);
  padding-block: var(--sp-5);
  font-family: var(--font-display); font-size: var(--fs-md); font-weight: 600;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .plus { flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--color-border); display: flex; align-items: center; justify-content: center; position: relative; transition: transform var(--dur-base) var(--ease-out), background var(--dur-base); }
.faq-item .plus::before, .faq-item .plus::after { content: ""; position: absolute; background: var(--color-ink); }
.faq-item .plus::before { width: 12px; height: 2px; }
.faq-item .plus::after { width: 2px; height: 12px; transition: opacity var(--dur-fast); }
.faq-item[open] .plus { transform: rotate(180deg); background: var(--color-primary); border-color: var(--color-primary); }
.faq-item[open] .plus::before, .faq-item[open] .plus::after { background: #fff; }
.faq-item[open] .plus::after { opacity: 0; }
.faq-item p { padding-bottom: var(--sp-5); max-width: 46rem; color: var(--color-ink-soft); }

/* Split section (texto + imagen) */
.split { display: grid; gap: var(--sp-7); align-items: center; }
@media (min-width: 960px) { .split { grid-template-columns: 1fr 1fr; gap: var(--sp-9); } }
.split.is-reverse { direction: rtl; }
.split.is-reverse > * { direction: ltr; }
.media-frame { position: relative; border-radius: var(--radius-lg); overflow: hidden; aspect-ratio: 4/3; background: var(--stone-300); }
.media-frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.media-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.media-badge {
  position: absolute; bottom: var(--sp-5); left: var(--sp-5);
  background: rgba(250,248,244,0.92); backdrop-filter: blur(6px);
  border-radius: var(--radius-md); padding: var(--sp-4) var(--sp-5);
  display: flex; align-items: center; gap: var(--sp-3);
  box-shadow: var(--shadow-md);
}
.media-badge strong { font-family: var(--font-display); font-size: var(--fs-lg); color: var(--color-primary); display: block; }
.media-badge span { font-size: var(--fs-xs); color: var(--color-ink-soft); }

.checklist { display: grid; gap: var(--sp-3); margin-top: var(--sp-5); }
.checklist li { display: flex; align-items: flex-start; gap: var(--sp-3); }
.checklist svg { width: 22px; height: 22px; flex-shrink: 0; color: var(--color-primary); margin-top: 2px; }

/* CTA band */
.cta-band {
  background: var(--rust-700);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--sp-8) var(--container-pad);
  display: grid; gap: var(--sp-6);
  text-align: center;
  justify-items: center;
  position: relative;
  overflow: hidden;
}
.cta-band h2 { font-size: var(--fs-xl); max-width: 40rem; color: #fff; }
.cta-band p { color: var(--stone-300); max-width: 34rem; }
.cta-band .btn-primary { background: var(--color-accent); }

/* Forms */
.form-grid { display: grid; gap: var(--sp-5); }
@media (min-width: 640px) { .form-grid.cols-2 { grid-template-columns: 1fr 1fr; } }
.field { display: flex; flex-direction: column; gap: var(--sp-2); min-width: 0; }
.field label { font-size: var(--fs-sm); font-weight: 600; }
.field .required { color: var(--color-accent); }
.field input, .field select, .field textarea {
  width: 100%;
  max-width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  background: var(--color-surface);
  min-height: 48px;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
  outline: none;
}
.field .hint { font-size: var(--fs-xs); color: var(--color-ink-soft); }
.form-status { font-size: var(--fs-sm); padding: var(--sp-3) var(--sp-4); border-radius: var(--radius-sm); display: none; }
.form-status.is-visible { display: block; }
.form-status.success { background: var(--rust-100); color: var(--rust-700); }
.form-status.error { background: #F7E2DC; color: #7A2E12; }

/* Calculadora de presupuesto */
#formulario-contacto { scroll-margin-top: var(--header-h); }
.calculator-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-7);
  box-shadow: var(--shadow-sm);
}
.calc-result { margin-top: var(--sp-7); padding-top: var(--sp-7); border-top: 1px solid var(--color-border); }
.calc-result[hidden] { display: none; }
.calc-result-range {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  color: var(--color-primary);
  margin-top: var(--sp-2);
}
.calc-result-sub { font-size: var(--fs-sm); color: var(--color-ink-soft); margin-top: var(--sp-2); }
.calc-result-note { font-size: var(--fs-xs); color: var(--color-ink-soft); margin-top: var(--sp-3); max-width: 40rem; }

/* Footer */
.site-footer { background: var(--stone-900); color: var(--stone-300); padding-block: var(--sp-9) var(--sp-6); }
.footer-grid { display: grid; gap: var(--sp-7); grid-template-columns: 1fr; }
@media (min-width: 860px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.footer-brand .logo { margin-bottom: var(--sp-4); }
.footer-brand .logo-img { height: 24px; max-width: 190px; }
.footer-brand p { max-width: 26rem; font-size: var(--fs-sm); }
.footer-col h4 { color: #fff; font-family: var(--font-body); font-size: var(--fs-sm); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: var(--sp-4); }
.footer-col ul { display: grid; gap: var(--sp-3); }
.footer-col a, .footer-col address { font-size: var(--fs-sm); font-style: normal; }
.footer-col a:hover { color: #fff; }
.footer-social { display: flex; gap: var(--sp-3); margin-top: var(--sp-5); }
.footer-social a { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--stone-700); display: flex; align-items: center; justify-content: center; transition: background var(--dur-base), border-color var(--dur-base); }
.footer-social a:hover { background: var(--color-primary); border-color: var(--color-primary); }
.footer-social svg { width: 18px; height: 18px; }
.footer-bottom {
  margin-top: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--stone-700);
  display: flex; flex-wrap: wrap; gap: var(--sp-4);
  justify-content: space-between;
  font-size: var(--fs-xs);
}
.footer-bottom ul { display: flex; gap: var(--sp-5); flex-wrap: wrap; }

/* Breadcrumb */
.breadcrumb { padding-block: var(--sp-5); margin-top: var(--header-h); font-size: var(--fs-xs); color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span[aria-current] { color: var(--color-ink); font-weight: 600; }

/* Page hero (subpáginas) */
.page-hero { padding-block: calc(var(--header-h) + var(--sp-8)) var(--sp-8); background: var(--stone-100); }
.page-hero h1 { font-size: var(--fs-2xl); }
.page-hero p { margin-top: var(--sp-4); font-size: var(--fs-md); color: var(--color-ink-soft); max-width: 42rem; }

/* Legal pages */
.prose { max-width: 62rem; }
.prose h2 { font-size: var(--fs-lg); margin-top: var(--sp-7); }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: var(--color-ink-soft); margin-top: var(--sp-3); }
.prose ul { list-style: disc; padding-left: 1.4rem; }

/* Utility */
.text-center { text-align: center; }
.mt-8 { margin-top: var(--sp-8); }
.flex-center { display: flex; align-items: center; justify-content: center; }