:root {
  --grafito: #1e2124;
  --gris-900: #2b2f33;
  --gris-700: #4a4f55;
  --gris-500: #7a8087;
  --gris-300: #c9ccd0;
  --gris-100: #eef0f1;
  --blanco: #fafafa;
  --verde: #6f8f78;        /* acento: usar poco */
  --verde-claro: #a9c2b0;
  --max: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", system-ui, sans-serif;
  color: var(--gris-900);
  background: var(--blanco);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
.contenedor { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- Encabezado ---------- */
header {
  position: fixed; inset: 0 0 auto 0; z-index: 10;
  transition: background .3s, box-shadow .3s;
}
header.solido { background: rgba(30, 33, 36, .96); box-shadow: 0 1px 0 rgba(255,255,255,.06); }
.barra { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.marca { text-decoration: none; color: #fff; line-height: 1.1; }
.marca strong { display: block; font-family: "Cormorant Garamond", serif; font-size: 1.7rem; font-weight: 600; letter-spacing: .01em; }
.marca span { font-size: .68rem; letter-spacing: .28em; text-transform: uppercase; color: var(--gris-300); }
nav ul { display: flex; gap: 36px; list-style: none; }
nav a {
  text-decoration: none; color: var(--gris-100); font-size: .9rem; font-weight: 500;
  letter-spacing: .04em; padding: 6px 0; border-bottom: 2px solid transparent; transition: border-color .2s, color .2s;
}
nav a:hover { color: #fff; border-color: var(--verde); }
.menu-btn { display: none; background: none; border: 0; color: #fff; cursor: pointer; padding: 8px; }
.menu-btn span { display: block; width: 24px; height: 2px; background: currentColor; margin: 5px 0; }

/* ---------- Portada ---------- */
.portada {
  background: var(--grafito); color: #fff;
  padding: 170px 0 110px;
}
.portada-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: center; }
.portada-imagen { position: relative; z-index: 0; }
.portada-imagen img {
  display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; object-position: 35% center;
  filter: grayscale(1) contrast(1.05) brightness(.85);
}
.portada-imagen::after {  /* marco desplazado, detalle en verde */
  content: ""; position: absolute; inset: 18px -18px -18px 18px;
  border: 1px solid var(--verde); z-index: -1;
}
.etiqueta {
  display: inline-block; font-size: .75rem; letter-spacing: .3em; text-transform: uppercase;
  color: var(--verde-claro); margin-bottom: 20px;
}
.portada h1 {
  font-family: "Cormorant Garamond", serif; font-weight: 500;
  font-size: clamp(2.6rem, 6vw, 4.6rem); line-height: 1.08; max-width: 14ch; margin-bottom: 24px;
}
.portada p { max-width: 520px; font-size: 1.08rem; color: var(--gris-300); margin-bottom: 40px; }
.boton {
  display: inline-block; text-decoration: none; font-weight: 500; font-size: .92rem; letter-spacing: .04em;
  padding: 14px 30px; border: 1px solid var(--gris-300); color: #fff; transition: background .2s, border-color .2s;
}
.boton:hover { background: var(--verde); border-color: var(--verde); }

/* ---------- Secciones ---------- */
section { padding: 110px 0; }
.titulo-seccion { margin-bottom: 56px; }
.titulo-seccion .etiqueta { color: var(--verde); margin-bottom: 12px; }
.titulo-seccion h2 {
  font-family: "Cormorant Garamond", serif; font-weight: 500;
  font-size: clamp(2rem, 4vw, 2.9rem); line-height: 1.15; color: var(--grafito);
}

/* Estudio */
.estudio-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 72px; align-items: start; }
.dato {
  border-left: 2px solid var(--verde); padding-left: 28px;
}
.dato .numero { font-family: "Cormorant Garamond", serif; font-size: 5.5rem; line-height: 1; color: var(--grafito); }
.dato .texto { color: var(--gris-500); font-size: .95rem; max-width: 24ch; margin-top: 8px; }
.estudio-texto p { color: var(--gris-700); font-size: 1.05rem; }
.estudio-texto p + p { margin-top: 20px; }

/* Servicios */
.servicios { background: var(--gris-100); }
.servicios-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.tarjeta {
  background: #fff; padding: 40px 34px; border-top: 3px solid var(--gris-300);
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.tarjeta:hover { border-color: var(--verde); transform: translateY(-4px); box-shadow: 0 18px 40px -24px rgba(30,33,36,.35); }
.tarjeta h3 { font-family: "Cormorant Garamond", serif; font-weight: 600; font-size: 1.75rem; color: var(--grafito); margin-bottom: 22px; }
.tarjeta h4 {
  font-size: .72rem; letter-spacing: .2em; text-transform: uppercase; color: var(--gris-500);
  font-weight: 600; margin: 22px 0 8px;
}
.tarjeta h4:first-of-type { margin-top: 0; }
.tarjeta h5 { font-size: .95rem; font-weight: 600; color: var(--gris-900); margin: 22px 0 4px; }
.tarjeta h5 + h4 { margin-top: 10px; }
.tarjeta ul { list-style: none; }
.tarjeta li { position: relative; padding-left: 18px; color: var(--gris-700); font-size: .95rem; margin: 4px 0; }
.tarjeta li::before {
  content: ""; position: absolute; left: 0; top: .72em; width: 6px; height: 1px; background: var(--gris-500);
}

/* Contacto */
.contacto { background: var(--grafito); color: var(--gris-100); }
.contacto .titulo-seccion h2 { color: #fff; }
.contacto .titulo-seccion .etiqueta { color: var(--verde-claro); }
.contacto-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(255,255,255,.08); }
.contacto-item { background: var(--grafito); padding: 36px 32px 36px 0; }
.contacto-item + .contacto-item { padding-left: 32px; }
.contacto-item h3 { font-size: .72rem; letter-spacing: .22em; text-transform: uppercase; color: var(--gris-500); font-weight: 600; margin-bottom: 12px; }
.contacto-item p, .contacto-item a { font-size: 1.08rem; color: #fff; text-decoration: none; }
.contacto-item a:hover { color: var(--verde-claro); }
.contacto-item small { display: block; color: var(--gris-500); font-size: .88rem; margin-top: 4px; }

footer { background: #17191b; color: var(--gris-500); font-size: .82rem; padding: 26px 0; }
footer .contenedor { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .portada { padding: 130px 0 80px; }
  .portada-grid { grid-template-columns: 1fr; gap: 48px; }
  .portada-imagen { margin-right: 18px; }
  .estudio-grid { grid-template-columns: 1fr; gap: 40px; }
  .servicios-grid { grid-template-columns: 1fr; }
  .contacto-grid { grid-template-columns: 1fr; background: none; }
  .contacto-item, .contacto-item + .contacto-item { padding: 24px 0; border-bottom: 1px solid rgba(255,255,255,.08); }
}
@media (max-width: 720px) {
  .menu-btn { display: block; }
  nav {
    position: absolute; top: 76px; left: 0; right: 0; background: rgba(30,33,36,.98);
    max-height: 0; overflow: hidden; transition: max-height .3s;
  }
  nav.abierto { max-height: 300px; }
  nav ul { flex-direction: column; gap: 0; padding: 8px 24px 20px; }
  nav a { display: block; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.06); }
  section { padding: 80px 0; }
}