:root {
  --bg: #f7f4ee;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #5b6670;
  --primary: #8a5a2b;
  --primary-dark: #6f451d;
  --accent: #d7b48a;
  --border: #e5ddd1;
  --shadow: 0 10px 30px rgba(31, 41, 51, 0.08);
  --radius: 16px;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.container { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 10; backdrop-filter: blur(10px);
  background: rgba(247,244,238,0.92); border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  min-height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  color: var(--text);
  font-size: 1.1rem;
}
.brand span { color: var(--primary); }
.brand-logo {
  height: 42px;
  width: auto;
}
.brand-logo-mobile {
  display: none;
  height: 36px;
  width: auto;
}
.nav-links { display: flex; gap: 18px; flex-wrap: wrap; }
.nav-links a { font-weight: 600; color: var(--text); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 20px; border-radius: 999px; font-weight: 700; border: 0; cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
.hero {
  padding: 72px 0 36px;
}
.hero-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 28px; align-items: center;
}
.kicker {
  display: inline-block; padding: 8px 12px; border-radius: 999px; background: #efe4d7; color: var(--primary-dark);
  font-size: 0.9rem; font-weight: 700; margin-bottom: 16px;
}
h1, h2, h3 { line-height: 1.15; margin: 0 0 16px; }
h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 16px; color: var(--muted); }
.hero-card, .card, .contact-box, .faq-item, .placeholder-visual {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  min-height: 360px;
  display: flex;
  align-items: end;
  background: linear-gradient(180deg, rgba(25, 22, 18, 0.18) 0%, rgba(25, 22, 18, 0.62) 100%), url('assets/movimiento_de_tierras.png') center/cover;
  color: #fff;
}
.hero-card p { color: rgba(255,255,255,0.92); }
.section { padding: 36px 0; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card { padding: 24px; }
.card p, .faq-item p, .contact-box p { margin-bottom: 0; }
.card-media {
  width: calc(100% + 48px);
  max-width: none;
  margin: -24px -24px 18px;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 16px 16px 0 0;
}
.checklist { padding-left: 18px; color: var(--muted); }
.checklist li { margin-bottom: 10px; }
.cta-band {
  padding: 28px; background: linear-gradient(135deg, #7a4c20 0%, #aa7544 100%); color: #fff; border-radius: var(--radius);
}
.cta-band p, .cta-band a { color: rgba(255,255,255,0.95); }
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
label { display: block; font-weight: 700; margin-bottom: 8px; }
input, select, textarea {
  width: 100%; padding: 14px 16px; border: 1px solid #cfc3b3; border-radius: 12px; background: #fff; font: inherit;
}
textarea { min-height: 140px; resize: vertical; }
.full { grid-column: 1 / -1; }
.placeholder-visual {
  position: relative;
  overflow: hidden;
  min-height: 220px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: end;
  background: linear-gradient(160deg, #cba57d 0%, #8b5c30 100%);
  color: #fff;
}
.placeholder-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(18, 16, 12, 0.1) 0%, rgba(18, 16, 12, 0.62) 100%), var(--visual-image, none) center/cover;
}
.placeholder-visual > * {
  position: relative;
  z-index: 1;
}
.placeholder-visual small { color: rgba(255,255,255,0.9); }
.visual-zanjas { --visual-image: url('assets/zanjas_para_canalizaciones.png'); }
.visual-tierras { --visual-image: url('assets/movimiento_de_tierras.png'); }
.visual-cimentaciones { --visual-image: url('assets/vaciados_para_cimentaciones.png'); }
.visual-derribos { --visual-image: url('assets/derribos_demolicion_controlada_aprox.png'); }
.site-footer { padding: 36px 0 48px; border-top: 1px solid var(--border); margin-top: 20px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; gap: 20px; }
.note { font-size: 0.92rem; color: var(--muted); }
@media (max-width: 900px) {
  .hero-grid, .grid-3, .grid-2, .footer-grid, .form-grid { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; padding: 14px 0; }
  .nav-links { gap: 12px; }
  .brand-logo { display: none; }
  .brand-logo-mobile { display: block; }
}