*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0b0d;
  --bg-elevated: #111318;
  --bg-card: #161922;
  --surface: #1c1f2a;
  --border: #252938;
  --border-light: #333850;
  --text: #e8e9ed;
  --text-muted: #8a8fa6;
  --text-dim: #7c8197;
  --accent: #b4c7a3;
  --accent-bright: #d4e8c2;
  --accent-dim: #6b7d5c;
  --topo: #1e2430;
  --topo-line: #252d3a;
  --ff-display: 'Instrument Serif', Georgia, serif;
  --ff-body: 'DM Sans', system-ui, sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--ff-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════
   TOPOGRAPHIC BACKGROUND PATTERN
   ═══════════════════════════════════════ */

.topo-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.3;
  pointer-events: none;
}

.topo-bg svg {
  width: 100%;
  height: 100%;
}

/* ═══════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
}

section {
  position: relative;
  z-index: 1;
}

/* ═══════════════════════════════════════
   NAV
   ═══════════════════════════════════════ */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: all 0.4s ease;
  backdrop-filter: blur(0px);
}

nav.scrolled {
  background: rgba(10, 11, 13, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 0;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--ff-body);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-logo-mark {
  width: 28px;
  height: 28px;
  border: 2px solid var(--accent);
  border-radius: 4px;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
}

.nav-logo-mark::before {
  content: '';
  width: 18px;
  height: 18px;
  background: linear-gradient(135deg, transparent 40%, var(--accent-dim) 40%, var(--accent-dim) 60%, transparent 60%);
  opacity: 0.6;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  transition: color 0.3s;
}

.nav-links a:hover { color: var(--accent-bright); }

.nav-cta {
  background: var(--accent-dim) !important;
  color: var(--bg) !important;
  padding: 0.5rem 1.25rem;
  border-radius: 4px;
  font-weight: 500 !important;
  transition: background 0.3s !important;
}

.nav-cta:hover { background: var(--accent) !important; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: all 0.3s;
}

/* ═══════════════════════════════════════
   HERO
   ═══════════════════════════════════════ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 6rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-content { max-width: 540px; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(107, 125, 92, 0.12);
  border: 1px solid rgba(107, 125, 92, 0.25);
  padding: 0.45rem 1rem;
  border-radius: 3px;
  margin-bottom: 2rem;
}

.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero h1 {
  font-family: var(--ff-display);
  font-size: clamp(2.8rem, 5vw, 4.2rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.hero h1 em {
  font-style: italic;
  color: var(--accent-bright);
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 440px;
  font-weight: 300;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.9rem 2rem;
  border: none;
  border-radius: 4px;
  font-family: var(--ff-body);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s;
}

.btn-primary:hover {
  background: var(--accent-bright);
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(180, 199, 163, 0.15);
}

.btn-primary svg { width: 16px; height: 16px; }

.btn-secondary {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 400;
  padding: 0.9rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: all 0.3s;
}

.btn-secondary:hover {
  color: var(--text);
  border-color: var(--border-light);
}

/* Hero visual: before/after */
.hero-visual {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.hero-visual-layer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hero-before {
  background: linear-gradient(170deg, #1a2a1f 0%, #0f1a14 40%, #152018 100%);
  z-index: 1;
  clip-path: polygon(0 0, var(--split, 50%) 0, var(--split, 50%) 100%, 0 100%);
  transition: clip-path 0.1s linear;
}

.hero-after {
  background: linear-gradient(170deg, #1a2a1f 0%, #0f1a14 40%, #152018 100%);
  z-index: 0;
}

.hero-landscape {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-landscape .mountain {
  position: absolute;
  bottom: 0;
  width: 100%;
}

.hero-before .mountain {
  height: 60%;
  background: linear-gradient(180deg, #2a3d2e 0%, #1a2a1f 100%);
  clip-path: polygon(0% 100%, 0% 45%, 8% 35%, 18% 50%, 28% 25%, 38% 40%, 48% 15%, 55% 30%, 65% 20%, 75% 35%, 85% 10%, 92% 25%, 100% 30%, 100% 100%);
}

.hero-after .mountain {
  height: 60%;
  background: linear-gradient(180deg, #2a3d2e 0%, #1a2a1f 100%);
  clip-path: polygon(0% 100%, 0% 45%, 8% 35%, 18% 50%, 28% 25%, 38% 40%, 48% 15%, 55% 30%, 65% 20%, 75% 35%, 85% 10%, 92% 25%, 100% 30%, 100% 100%);
}

/* Wind turbines in "after" */
.turbine {
  position: absolute;
  bottom: 30%;
  z-index: 2;
}

.turbine-tower {
  width: 3px;
  height: 60px;
  background: linear-gradient(180deg, #8a9a7c, #6a7a5c);
  margin: 0 auto;
}

.turbine-hub {
  width: 7px;
  height: 7px;
  background: #a0b090;
  border-radius: 50%;
  margin: 0 auto -3px;
  position: relative;
  z-index: 2;
}

.turbine-blades {
  position: relative;
  width: 50px;
  height: 50px;
  margin: -25px auto 0;
  animation: spin-blade 4s linear infinite;
}

.turbine-blades::before,
.turbine-blades::after,
.turbine-blades span {
  content: '';
  position: absolute;
  width: 2px;
  height: 24px;
  background: linear-gradient(180deg, #a0b090, transparent);
  left: 50%;
  top: 50%;
  transform-origin: center top;
  border-radius: 1px;
}

.turbine-blades::before { transform: translateX(-50%) rotate(0deg); }
.turbine-blades::after { transform: translateX(-50%) rotate(120deg); }
.turbine-blades span { transform: translateX(-50%) rotate(240deg); }

.t1 { left: 25%; }
.t2 { left: 45%; bottom: 38%; }
.t2 .turbine-tower { height: 50px; }
.t2 .turbine-blades { width: 40px; height: 40px; animation-duration: 5s; }
.t3 { left: 70%; bottom: 35%; }
.t3 .turbine-tower { height: 45px; }
.t3 .turbine-blades { width: 36px; height: 36px; animation-duration: 4.5s; }

@keyframes spin-blade { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* Slider control */
.hero-slider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split, 50%);
  width: 3px;
  background: var(--accent);
  z-index: 10;
  cursor: col-resize;
  transition: left 0.1s linear;
}

.hero-slider::before {
  content: '◀ ▶';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent);
  color: var(--bg);
  font-size: 0.5rem;
  padding: 0.6rem 0.4rem;
  border-radius: 3px;
  white-space: nowrap;
  letter-spacing: 0.15em;
}

.hero-label {
  position: absolute;
  bottom: 1rem;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  background: rgba(10, 11, 13, 0.7);
  border-radius: 3px;
  z-index: 11;
  font-weight: 500;
}

.label-before { left: 1rem; color: var(--text-muted); }
.label-after { right: 1rem; color: var(--accent); }

/* ═══════════════════════════════════════
   STATS BAR
   ═══════════════════════════════════════ */

.stats {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 3rem 0;
  margin-bottom: 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stats-clients {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stat-number {
  font-family: var(--ff-display);
  font-size: 2.8rem;
  color: var(--accent-bright);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ═══════════════════════════════════════
   SECTION HEADERS
   ═══════════════════════════════════════ */

.section-header {
  margin-bottom: 4rem;
  max-width: 600px;
}

.section-header.centered {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-dim);
  font-weight: 500;
  margin-bottom: 1rem;
  display: block;
}

.section-title {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 1rem;
}

.section-title em {
  font-style: italic;
  color: var(--accent);
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  font-weight: 300;
}

/* ═══════════════════════════════════════
   SERVICIOS
   ═══════════════════════════════════════ */

.servicios {
  padding: 7rem 0;
}

.servicios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.servicio-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2.5rem 2rem;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.servicio-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.servicio-card:hover {
  border-color: var(--border-light);
  transform: translateY(-3px);
}

.servicio-card:hover::before { opacity: 1; }

.servicio-icon {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: grid;
  place-items: center;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.servicio-icon svg { width: 22px; height: 22px; }

.servicio-card h3 {
  font-family: var(--ff-body);
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.servicio-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  font-weight: 300;
}

/* ═══════════════════════════════════════
   PROCESO
   ═══════════════════════════════════════ */

.proceso {
  padding: 7rem 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.proceso-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.proceso-steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, var(--border), var(--accent-dim), var(--border));
}

.step {
  text-align: center;
  padding: 0 1.5rem;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border: 2px solid var(--border-light);
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0 auto 1.5rem;
  font-family: var(--ff-display);
  font-size: 1.3rem;
  color: var(--accent);
  background: var(--bg-elevated);
  position: relative;
  z-index: 1;
  transition: all 0.3s;
}

.step:hover .step-number {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(180, 199, 163, 0.1);
}

.step h3 {
  font-family: var(--ff-body);
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.step p {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.6;
  font-weight: 300;
}

/* ═══════════════════════════════════════
   PORTAFOLIO
   ═══════════════════════════════════════ */

.portafolio {
  padding: 7rem 0;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.portfolio-item {
  aspect-ratio: 16/10;
  border-radius: 5px;
  overflow: hidden;
  position: relative;
  cursor: pointer;
  border: 1px solid var(--border);
}

.portfolio-item-bg {
  position: absolute;
  inset: 0;
  transition: transform 0.6s ease;
}

.portfolio-item:hover .portfolio-item-bg { transform: scale(1.05); }

.portfolio-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(10, 11, 13, 0.9) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity 0.4s;
}

.portfolio-item:hover .portfolio-item-overlay { opacity: 1; }

.portfolio-item h4 {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.portfolio-item span {
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.05em;
}

/* Color palettes for placeholder portfolio items */
.pf-wind { background: linear-gradient(135deg, #1a2e28, #0e1f1a, #223830); }
.pf-solar { background: linear-gradient(135deg, #2a2518, #1a1810, #302a1e); }
.pf-mining { background: linear-gradient(135deg, #201a18, #181210, #2a2018); }
.pf-transmission { background: linear-gradient(135deg, #181e2a, #101520, #1e2530); }
.pf-port { background: linear-gradient(135deg, #152028, #0e1820, #1a2a35); }
.pf-road { background: linear-gradient(135deg, #1e1e22, #141418, #252528); }

/* ═══════════════════════════════════════
   SECTORES
   ═══════════════════════════════════════ */

.sectores {
  padding: 7rem 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.sectores-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1.25rem;
}

.sector-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2rem 1.25rem;
  text-align: center;
  transition: all 0.3s;
}

.sector-card:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
}

.sector-icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  display: block;
  filter: grayscale(0.3);
}

.sector-card h4 {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1.4;
}
.sector-card h3.sector-name {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1.4;
}

/* ═══════════════════════════════════════
   NORMATIVA BANNER
   ═══════════════════════════════════════ */

.normativa {
  padding: 4rem 0;
}

.normativa-inner {
  background: linear-gradient(135deg, rgba(107, 125, 92, 0.08), rgba(107, 125, 92, 0.03));
  border: 1px solid rgba(107, 125, 92, 0.2);
  border-radius: 8px;
  padding: 3rem;
  display: flex;
  align-items: center;
  gap: 3rem;
}

.normativa-icon {
  width: 64px;
  height: 64px;
  border: 2px solid var(--accent-dim);
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--accent);
}

.normativa-icon svg { width: 28px; height: 28px; }

.normativa h3 {
  font-family: var(--ff-display);
  font-size: 1.3rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
}

.normativa p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  font-weight: 300;
}

/* ═══════════════════════════════════════
   CONTACTO
   ═══════════════════════════════════════ */

.contacto {
  padding: 7rem 0 5rem;
}

.contacto-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contacto-info h3 {
  font-family: var(--ff-display);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.contacto-info a, .contacto-info p {
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
}

.contacto-info a:hover { color: var(--accent-bright); }

.contacto-info .info-block { margin-bottom: 2rem; }

.contacto-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row { display: flex; gap: 1.25rem; }
.form-row > * { flex: 1; }

.contacto-form label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.contacto-form input,
.contacto-form textarea,
.contacto-form select {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--ff-body);
  font-size: 0.9rem;
  padding: 0.85rem 1rem;
  border-radius: 4px;
  outline: none;
  transition: border-color 0.3s;
}

.contacto-form input:focus,
.contacto-form textarea:focus,
.contacto-form select:focus {
  border-color: var(--accent-dim);
}

.contacto-form textarea { resize: vertical; min-height: 120px; }

.contacto-form select option { background: var(--bg-card); }

/* Form step labels */
.form-step-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-dim);
  font-weight: 500;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* Checkbox grid */
.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: all 0.2s;
  user-select: none;
}

.check-item:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.check-item input { display: none; }

.check-mark {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-light);
  border-radius: 3px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  transition: all 0.2s;
}

.check-item input:checked ~ .check-mark {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.check-item input:checked ~ .check-mark::after {
  content: '✓';
  font-size: 0.65rem;
  color: var(--bg);
  font-weight: 700;
}

.check-item:has(input:checked) {
  border-color: var(--accent-dim);
  background: rgba(107, 125, 92, 0.06);
  color: var(--text);
}

/* Radio group */
.radio-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.radio-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.6rem 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: all 0.2s;
  user-select: none;
}

.radio-item:hover {
  border-color: var(--border-light);
  color: var(--text);
}

.radio-item input { display: none; }

.radio-mark {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-light);
  border-radius: 50%;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  transition: all 0.2s;
}

.radio-item input:checked ~ .radio-mark {
  border-color: var(--accent);
}

.radio-item input:checked ~ .radio-mark::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.radio-item:has(input:checked) {
  border-color: var(--accent-dim);
  background: rgba(107, 125, 92, 0.06);
  color: var(--text);
}

@media (max-width: 640px) {
  .checkbox-grid { grid-template-columns: 1fr; }
  .radio-group { flex-direction: column; }
}

/* ═══════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════ */

footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.78rem;
  transition: color 0.3s;
}

.footer-links a:hover { color: var(--accent); }

/* ═══════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════ */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.35s; }

/* ═══════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════ */

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero-visual { max-width: 500px; }
  .servicios-grid { grid-template-columns: repeat(2, 1fr); }
  .proceso-steps { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
  .proceso-steps::before { display: none; }
  .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
  .sectores-grid { grid-template-columns: repeat(3, 1fr); }
  .contacto-grid { grid-template-columns: 1fr; }
  .normativa-inner { flex-direction: column; text-align: center; gap: 1.5rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 11, 13, 0.97);
    backdrop-filter: blur(20px);
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-toggle { display: block; }
  .hero { padding: 7rem 0 4rem; min-height: auto; }
  .servicios-grid { grid-template-columns: 1fr; }
  .proceso-steps { grid-template-columns: 1fr; gap: 2rem; }
  .portfolio-grid { grid-template-columns: 1fr; }
  .sectores-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { flex-direction: column; gap: 1.25rem; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .footer-inner { flex-direction: column; gap: 1rem; text-align: center; }
}

/* ═══════════════════════════════════════
   COMPARE (before / after), real images
   ═══════════════════════════════════════ */
.compare {
  position: relative;
  aspect-ratio: var(--ratio, 16/9);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
  user-select: none;
  touch-action: pan-y;
}
.compare img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.compare-before { position: absolute; inset: 0; clip-path: inset(0 calc(100% - var(--split, 50%)) 0 0); z-index: 1; }
.compare-line {
  position: absolute; top: 0; bottom: 0; left: var(--split, 50%); width: 2px; margin-left: -1px;
  background: var(--accent); z-index: 2; pointer-events: none;
}
.compare-line::before {
  content: ''; position: absolute; top: 50%; left: 50%; width: 34px; height: 34px; transform: translate(-50%, -50%);
  border-radius: 50%; background: var(--accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230a0b0d' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 7l-5 5 5 5M15 7l5 5-5 5'/%3E%3C/svg%3E");
  background-size: 20px; background-position: center; background-repeat: no-repeat;
}
.compare-range { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: col-resize; z-index: 3; -webkit-appearance: none; appearance: none; }
.compare-range:focus-visible ~ .compare-line::before { outline: 2px solid var(--accent-bright); outline-offset: 3px; }
.compare-label {
  position: absolute; bottom: 0.75rem; z-index: 4; pointer-events: none;
  font-size: 0.62rem; letter-spacing: 0.15em; text-transform: uppercase; font-weight: 500;
  padding: 0.3rem 0.65rem; background: rgba(10, 11, 13, 0.72); border-radius: 3px;
}
.compare-label.is-before { left: 0.75rem; color: var(--text-muted); }
.compare-label.is-after { right: 0.75rem; color: var(--accent); }
.compare-caption { margin-top: 0.6rem; font-size: 0.8rem; color: var(--text-dim); }

/* hero uses the compare component */
.hero-visual.compare { aspect-ratio: 4/3; }

/* ═══════════════════════════════════════
   PROCESO thumbnails
   ═══════════════════════════════════════ */
.step-img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 4px; border: 1px solid var(--border); margin-bottom: 1rem; display: block; background: var(--bg-card); }
.step-credit { display: block; margin-top: 0.5rem; font-size: 0.72rem; color: var(--text-dim); }

/* ═══════════════════════════════════════
   PORTFOLIO cards (real projects)
   ═══════════════════════════════════════ */
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.case-card { display: block; text-decoration: none; color: inherit; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; background: var(--bg-card); transition: border-color 0.3s, transform 0.3s; }
.case-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.case-card:first-child { grid-column: 1 / -1; }
.case-card-img { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.case-card:first-child .case-card-img { aspect-ratio: 21/9; }
.case-card-img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: opacity 0.5s; }
.case-card-img .is-base { opacity: 0; }
.case-card:hover .case-card-img .is-base, .case-card:focus-visible .case-card-img .is-base { opacity: 1; }
.case-card-body { padding: 1.25rem 1.5rem 1.5rem; }
.case-card-meta { font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-dim); margin-bottom: 0.4rem; }
.case-card h3 { font-family: var(--ff-display); font-weight: 400; font-size: 1.6rem; line-height: 1.15; margin-bottom: 0.5rem; }
.case-card p { color: var(--text-muted); font-size: 0.88rem; line-height: 1.6; }
.case-card-cta { display: inline-flex; align-items: center; gap: 0.4rem; margin-top: 1rem; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); font-weight: 500; }
.case-card-cta svg { width: 12px; height: 12px; }

/* ═══════════════════════════════════════
   PROJECT DETAIL page
   ═══════════════════════════════════════ */
.case-page { padding: 8rem 0 4rem; }
.case-back { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-muted); text-decoration: none; margin-bottom: 2rem; }
.case-back:hover { color: var(--accent); }
.case-head { display: grid; grid-template-columns: 1.4fr 1fr; gap: 3rem; align-items: end; margin-bottom: 2.5rem; }
.case-head h1 { font-family: var(--ff-display); font-weight: 400; font-size: clamp(2.2rem, 4.5vw, 3.6rem); line-height: 1.05; margin: 0.6rem 0 1rem; }
.case-head p { color: var(--text-muted); line-height: 1.7; max-width: 46ch; }
.case-facts { display: grid; grid-template-columns: max-content 1fr; gap: 0.6rem 1.25rem; font-size: 0.86rem; border-top: 1px solid var(--border); padding-top: 1.25rem; }
.case-facts dt { color: var(--text-dim); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; padding-top: 0.15rem; }
.case-facts dd { color: var(--text); }
.case-facts a { color: var(--accent); }
.case-section { margin-top: 4.5rem; }
.case-section h2 { font-family: var(--ff-display); font-weight: 400; font-size: 2rem; margin-bottom: 0.4rem; }
.case-section > p { color: var(--text-muted); margin-bottom: 2rem; max-width: 60ch; }
.case-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; counter-reset: step; }
.case-step { counter-increment: step; }
.case-step a { display: block; }
.case-step img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 4px; border: 1px solid var(--border); background: var(--bg-card); display: block; transition: border-color 0.3s; }
.case-step a:hover img { border-color: var(--accent-dim); }
.case-step h3 { margin-top: 0.85rem; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); font-weight: 500; }
.case-step h3::before { content: counter(step, decimal-leading-zero) "  "; color: var(--text-dim); }
.case-step p { margin-top: 0.35rem; color: var(--text-muted); font-size: 0.86rem; line-height: 1.6; }
.case-compares { display: grid; gap: 2.5rem; }
.case-cta { margin-top: 5rem; padding: 2.5rem; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-card); display: flex; gap: 2rem; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.case-cta h2 { font-family: var(--ff-display); font-weight: 400; font-size: 1.8rem; }
.case-next { margin-top: 3rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.case-next a { color: var(--text-muted); text-decoration: none; font-size: 0.85rem; }
.case-next a:hover { color: var(--accent); }
.case-next span { display: block; font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.25rem; }

@media (max-width: 900px) {
  .cases-grid { grid-template-columns: 1fr; }
  .case-card:first-child .case-card-img { aspect-ratio: 16/9; }
  .case-head { grid-template-columns: 1fr; gap: 2rem; }
  .case-page { padding-top: 6.5rem; }
}

/* Contact form attachments */
.file-drop { margin-top: 1.25rem; border: 1px dashed var(--border-light); border-radius: 6px; padding: 1rem 1.1rem; transition: border-color 0.2s, background 0.2s; }
.file-drop.is-over { border-color: var(--accent); background: rgba(180, 199, 163, 0.06); }
.file-drop-label { display: flex; flex-direction: column; gap: 0.3rem; cursor: pointer; position: relative; }
.file-drop-label input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.file-drop-title { font-size: 0.9rem; color: var(--text); }
.file-drop-hint { font-size: 0.78rem; color: var(--text-dim); line-height: 1.5; }
.file-list { list-style: none; margin: 0; padding: 0; }
.file-list:not(:empty) { margin-top: 0.8rem; border-top: 1px solid var(--border); padding-top: 0.6rem; }
.file-list li { display: flex; align-items: center; gap: 0.75rem; font-size: 0.82rem; padding: 0.3rem 0; }
.file-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.file-size { color: var(--text-dim); font-variant-numeric: tabular-nums; }
.file-remove { background: none; border: 0; color: var(--text-muted); font-size: 1.1rem; line-height: 1; cursor: pointer; padding: 0 0.25rem; }
.file-remove:hover { color: var(--accent); }

/* Content pages (sector, guide, FAQ) */
.prose-head { max-width: 760px; margin-bottom: 2.5rem; }
.prose-head h1 { font-family: var(--ff-display); font-weight: 400; font-size: clamp(2.1rem, 4.2vw, 3.3rem); line-height: 1.08; margin: 0.6rem 0 1rem; }
.prose-head p { color: var(--text-muted); font-size: 1.05rem; line-height: 1.7; }
.prose { max-width: 760px; }
.prose h2 { font-family: var(--ff-display); font-weight: 400; font-size: 1.8rem; margin: 2.6rem 0 0.9rem; }
.prose p { color: var(--text-muted); line-height: 1.8; margin-bottom: 1rem; }
.prose ul { margin: 0 0 1rem 1.1rem; color: var(--text-muted); line-height: 1.8; }
.prose li { margin-bottom: 0.45rem; padding-left: 0.2rem; }
.prose li::marker { color: var(--accent-dim); }
.prose-source { font-size: 0.85rem; border-top: 1px solid var(--border); padding-top: 1rem; margin-top: 2rem; }
.prose a, .case-topic a { color: var(--accent); }
.faq details { border-bottom: 1px solid var(--border); padding: 1rem 0; }
.faq summary { cursor: pointer; color: var(--text); font-size: 1rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--accent); font-size: 1.2rem; line-height: 1; }
.faq details[open] summary::after { content: '−'; }
.faq details p { margin: 0.75rem 0 0; }
.topic-links, .footer-topics { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; }
.topic-links { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.topic-links a, .footer-topics a { color: var(--text-muted); text-decoration: none; font-size: 0.85rem; }
.topic-links a:hover, .footer-topics a:hover { color: var(--accent); }
.footer-topics { flex-basis: 100%; order: 3; margin-top: 1rem; }
.case-topic { margin-top: 2.5rem; color: var(--text-muted); }
a.sector-card { text-decoration: none; color: inherit; }
a.sector-card:hover h3 { color: var(--accent); }