/* ─── Variables ─────────────────────────── */
:root {
  --black:   #080808;
  --dark:    #111110;
  --white:   #f0efeb;
  --gray-4:  #444;
  --gray-6:  #666;
  --gray-c:  #ccc;

  --serif:  'Cormorant Garamond', Georgia, serif;
  --sans:   'Jost', 'Helvetica Neue', Arial, sans-serif;

  --nav-h:   4rem;
  --pad:     clamp(4rem, 10vw, 8rem);
  --gutter:  2.5rem;
}

/* ─── Reset ─────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html  { scroll-behavior: smooth; }
body  {
  background: var(--black);
  color: var(--white);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

/* ─── Logo bar element ───────────────────── */
.bar {
  display: inline-block;
  width: 1.5px;
  background: currentColor;
  height: 0.68em;
  margin: 0 0.17em;
  vertical-align: middle;
  position: relative;
  top: -0.05em;
  opacity: 0.72;
}

/* ─── Scroll reveal ──────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.75s ease, transform 0.75s ease;
  transition-delay: var(--delay, 0s);
}
.reveal.visible { opacity: 1; transform: none; }

/* ─── Navigation ─────────────────────────── */
#nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 999;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  transition: background 0.45s ease, border-color 0.45s ease;
  border-bottom: 1px solid transparent;
}
#nav.scrolled {
  background: rgba(8, 8, 8, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: rgba(255, 255, 255, 0.07);
}

.nav-logo {
  display: flex;
  align-items: center;
  line-height: 1;
}
.nav-mark {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.nav-links { display: flex; gap: 2.25rem; }
.nav-links a {
  font-size: 0.73rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  opacity: 0.58;
  transition: opacity 0.2s;
}
.nav-links a:hover { opacity: 1; }

.nav-insta {
  display: flex;
  align-items: center;
  opacity: 0.58;
  transition: opacity 0.2s;
}
.nav-insta svg {
  width: 1rem;
  height: 1rem;
}
.nav-insta:hover { opacity: 1; }

/* ─── Hero ───────────────────────────────── */
#hero {
  height: 100vh;
  height: 100svh;
  min-height: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--black);
  overflow: hidden;
}

/* Engineering grid */
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.016) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.016) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
/* Radial vignette */
#hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 38%, rgba(8,8,8,0.65) 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  animation: fadeUp 1.3s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-logo {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(5rem, 16vw, 13rem);
  line-height: 1;
  letter-spacing: -0.015em;
  color: var(--white);
}
.hero-logo .bar {
  width: clamp(2px, 0.28vw, 3px);
  height: 0.6em;
  margin: 0 0.13em;
  opacity: 0.6;
}

/* ── Hero digit spin ─────────────────────── */
.logo-digit {
  display: inline-block;
  animation: digitSpin 1s cubic-bezier(0.4, 0, 0.2, 1);
}
.hero-logo .logo-digit:nth-child(1) { animation-delay: 1.3s; }
.hero-logo .logo-digit:nth-child(3) { animation-delay: 1.55s; }
.hero-logo .logo-digit:nth-child(5) { animation-delay: 1.8s; }
.hero-logo .logo-digit:nth-child(7) { animation-delay: 2.05s; }

@keyframes digitSpin {
  from { transform: perspective(600px) rotateY(0deg); }
  to   { transform: perspective(600px) rotateY(360deg); }
}

.hero-meta {
  position: absolute;
  bottom: 2rem;
  left: 0;
  right: 0;
  padding: 0 var(--gutter);
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  opacity: 0.38;
  z-index: 1;
  animation: fadeUp 1.3s cubic-bezier(0.16, 1, 0.3, 1) 0.42s both;
}

.scroll-hint { animation: bob 2.2s ease-in-out infinite; }
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(7px); }
}

/* ─── Section shells ─────────────────────── */
.section-light { background: var(--white); color: var(--black); }
.section-dark  { background: var(--dark);  color: var(--white); }

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--pad) var(--gutter);
}

/* ─── Section header ─────────────────────── */
.section-head {
  margin-bottom: 3.5rem;
  padding-bottom: 1.25rem;
}
.section-light .section-head { border-bottom: 1px solid rgba(8,8,8,0.12); }
.section-dark  .section-head { border-bottom: 1px solid rgba(255,255,255,0.1); }

.sec-num {
  display: block;
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.38em;
  opacity: 0.38;
  margin-bottom: 0.5rem;
}
.section-head h2 {
  font-family: var(--sans);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

/* ─── Nosotros ───────────────────────────── */
.nosotros-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
  margin-bottom: 4rem;
}

.nosotros-text .lead {
  font-family: var(--sans);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 300;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}
.nosotros-text p:not(.lead) {
  font-size: 0.88rem;
  color: var(--gray-6);
  line-height: 1.85;
  margin-bottom: 1rem;
}
.nosotros-text p:last-child { margin-bottom: 0; }

.pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 1.75rem;
}
.pillar {
  padding-top: 1.1rem;
  border-top: 1px solid rgba(8,8,8,0.14);
}
.pillar h3 {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  margin-bottom: 0.45rem;
}
.pillar p {
  font-size: 0.8rem;
  color: var(--gray-6);
  line-height: 1.65;
}

/* ─── Stats bar ──────────────────────────── */
.stats-bar {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 2rem 0;
  border-top: 1px solid rgba(8,8,8,0.1);
}
.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-align: center;
  cursor: default;
  perspective: 600px;
}
.stat:hover {
  animation: stat-flip 1.2s ease-in-out;
}
@keyframes stat-flip {
  0%   { transform: rotateY(0deg); }
  100% { transform: rotateY(360deg); }
}
.stat-n {
  font-family: var(--sans);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-n sup {
  font-size: 0.55em;
  vertical-align: super;
  opacity: 0.65;
}
.stat-l {
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.45;
}
.stat-div {
  width: 1px;
  height: 2.5rem;
  background: rgba(8,8,8,0.12);
}

/* ─── Obras ──────────────────────────────── */
.obras-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5px;
  background: rgba(255,255,255,0.07);
}
/* Stagger within each visual row */
.obra-card:nth-child(3n+2) { --delay: 0.08s; }
.obra-card:nth-child(3n+3) { --delay: 0.16s; }

.obra-card {
  position: relative;
  height: 320px;
}

/* ── 3D flip mechanics ── */
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transform: perspective(1200px) rotateY(0deg);
  -webkit-transform: perspective(1200px) rotateY(0deg);
  transition: transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
  -webkit-transition: -webkit-transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
}
.obra-card:hover .card-inner,
.obra-card.tapped .card-inner {
  transform: perspective(1200px) rotateY(180deg);
  -webkit-transform: perspective(1200px) rotateY(180deg);
}

.card-front,
.card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-front {
  background: var(--dark);
  padding: 2rem 1.75rem;
  overflow: hidden;
  transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
}

.card-back {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  overflow: hidden;
}
.card-back img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-back-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.82));
  padding: 3rem 1.75rem 1.4rem;
  color: var(--white);
}
.card-back-label h3 {
  font-family: var(--sans);
  font-size: clamp(0.9rem, 1.4vw, 1.05rem);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 0.2rem;
}
.card-back-label span {
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.6;
}

/* ── Card front content ── */
.obra-year-bg {
  position: absolute;
  bottom: -0.18em;
  right: -0.04em;
  font-family: var(--sans);
  font-size: clamp(5rem, 7.5vw, 8rem);
  font-weight: 300;
  color: rgba(255,255,255,0.038);
  line-height: 1;
  user-select: none;
  pointer-events: none;
  transition: color 0.35s;
}
.obra-card:hover .obra-year-bg { color: rgba(255,255,255,0.07); }

.obra-year {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  opacity: 0.80;
  margin-bottom: 0.7rem;
}
.card-front h3 {
  font-family: var(--sans);
  font-size: clamp(0.95rem, 1.5vw, 1.15rem);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 0.3rem;
}
.obra-loc {
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  opacity: 0.45;
  margin-bottom: 0.9rem;
}
.card-front p {
  font-size: 0.8rem;
  line-height: 1.7;
  opacity: 0.6;
  margin-bottom: 1.1rem;
}
.obra-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.obra-tags span {
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.18rem 0.5rem;
  border: 1px solid rgba(255,255,255,0.18);
  opacity: 0.55;
}

/* ─── Contacto ───────────────────────────── */
.contacto-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: end;
}
.contacto-cta {
  font-family: var(--sans);
  font-size: clamp(2.4rem, 5.5vw, 4.25rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.025em;
}
.contacto-cta em {
  font-style: italic;
  opacity: 0.55;
}

.contacto-info { display: flex; flex-direction: column; }
.contact-row {
  display: flex;
  flex-direction: column;
  gap: 0.22rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(8,8,8,0.1);
}
.contact-row:first-child { border-top: 1px solid rgba(8,8,8,0.1); }
.contact-lbl {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  opacity: 0.4;
}
.contact-row a {
  font-size: 0.98rem;
  font-weight: 300;
  transition: opacity 0.2s;
}
.contact-row a:hover { opacity: 0.55; }

.contact-insta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.contact-insta svg {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
}

/* ─── Footer ─────────────────────────────── */
footer {
  background: var(--black);
  color: var(--white);
  padding: 2.25rem var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255,255,255,0.07);
}
.footer-mark {
  font-family: var(--sans);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.footer-copy {
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  opacity: 0.35;
}

.footer-insta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  opacity: 0.45;
  transition: opacity 0.2s;
}
.footer-insta svg {
  width: 1rem;
  height: 1rem;
}
.footer-insta:hover { opacity: 0.8; }

/* ─── Responsive ──────────────────────────── */
@media (max-width: 1024px) {
  .obras-grid { grid-template-columns: repeat(2, 1fr); }
  .obra-card:nth-child(3n+2) { --delay: 0s; }
  .obra-card:nth-child(3n+3) { --delay: 0s; }
  .obra-card:nth-child(2n+2) { --delay: 0.08s; }
  .obra-card { height: 300px; }

  .nosotros-body { grid-template-columns: 1fr; gap: 3rem; }
}

@media (max-width: 700px) {
  :root { --gutter: 1.25rem; }

  .obras-grid { grid-template-columns: 1fr; }
  .obra-card:nth-child(n) { --delay: 0s; }
  .obra-card { height: 280px; }

  .nosotros-body { gap: 2.5rem; }
  .pillars { grid-template-columns: 1fr; }

  .contacto-body { grid-template-columns: 1fr; gap: 2.5rem; }
  .contacto-cta  { font-size: clamp(2rem, 8vw, 2.75rem); }

  .stats-bar { flex-wrap: wrap; gap: 1.5rem; }
  .stat { flex: 0 0 calc(50% - 1.5rem); }
  .stat-div { display: none; }

  .nav-links { gap: 1.25rem; }
  .nav-links a { font-size: 0.65rem; letter-spacing: 0.1em; }

  .hero-meta { font-size: 0.62rem; }

  footer { flex-direction: column; gap: 0.6rem; text-align: center; }
  .footer-insta { justify-content: center; }
}