:root {
  --verde: #39ff14;
  --verde2: #00c853;
  --cyan: #00e5ff;
  --fondo: #050d05;
  --fondo2: #0a1a0a;
  --fondo3: #0d2310;
  --texto: #c8f0c8;
  --texto-muted: #5a8a5a;
  --tarjeta: rgba(8, 24, 8, 0.85);
  --borde: rgba(57, 255, 20, 0.15);
  --borde2: rgba(57, 255, 20, 0.3);
  --glow: 0 0 20px rgba(57, 255, 20, 0.3);
  --glow2: 0 0 40px rgba(57, 255, 20, 0.15);
  --radio: 16px;
  --radio-lg: 24px;
  --trans: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--fondo);
  color: var(--texto);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- NAV ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(5, 13, 5, 0.75);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--borde);
  transition: var(--trans);
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, var(--verde), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

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

.nav-links a {
  color: var(--texto-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: var(--trans);
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--verde);
  transition: var(--trans);
}

.nav-links a:hover { color: var(--verde); }
.nav-links a:hover::after { width: 100%; }

/* ---- BOTONES ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--trans);
  letter-spacing: 0.03em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--verde), var(--verde2));
  color: #050d05;
  box-shadow: 0 4px 20px rgba(57, 255, 20, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(57, 255, 20, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--verde);
  border: 1px solid var(--borde2);
}
.btn-outline:hover {
  background: rgba(57, 255, 20, 0.08);
  border-color: var(--verde);
  transform: translateY(-2px);
}

/* ---- HERO ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 50%, #0d2b0d 0%, #050d05 60%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.celula {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%,
    rgba(57, 255, 20, 0.06),
    rgba(57, 255, 20, 0.01) 60%,
    transparent);
  border: 1px solid rgba(57, 255, 20, 0.1);
  animation: flotar var(--dur, 12s) linear infinite;
  animation-delay: var(--delay, 0s);
}

.celula::after {
  content: '';
  position: absolute;
  top: 15%; left: 15%;
  width: 25%; height: 25%;
  border-radius: 50%;
  background: rgba(57, 255, 20, 0.12);
}

@keyframes flotar {
  0%   { transform: translateY(110vh) translateX(0)                  rotate(0deg)   scale(0.4); opacity: 0; }
  8%   { opacity: 1; }
  50%  { transform: translateY(40vh)  translateX(var(--drift, 40px)) rotate(180deg) scale(1); }
  92%  { opacity: 1; }
  100% { transform: translateY(-15vh) translateX(calc(var(--drift, 40px) * 1.5)) rotate(360deg) scale(0.4); opacity: 0; }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(57,255,20,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57,255,20,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 2rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid var(--borde2);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--verde);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-badge span { font-size: 1rem; }

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero-title .linea1 {
  display: block;
  background: linear-gradient(135deg, var(--verde) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(57, 255, 20, 0.4));
}

.hero-title .linea2 {
  display: block;
  color: var(--texto);
  font-size: 0.5em;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
  margin-top: 0.25em;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--texto-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--texto-muted);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  animation: pulsar 2s ease-in-out infinite;
}

.hero-scroll .flecha { font-size: 1.2rem; }

@keyframes pulsar {
  0%, 100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
  50%       { opacity: 1;   transform: translateX(-50%) translateY(6px); }
}

/* ---- FEATURES ---- */
.features {
  padding: 6rem 2rem;
  background: var(--fondo2);
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  padding: 0.3rem 0.9rem;
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid var(--borde);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--verde);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--texto);
}

.section-title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--verde), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}

.feature-card {
  background: var(--tarjeta);
  border: 1px solid var(--borde);
  border-radius: var(--radio-lg);
  padding: 2rem;
  transition: var(--trans);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--verde), transparent);
  opacity: 0;
  transition: var(--trans);
}

.feature-card:hover { border-color: var(--borde2); transform: translateY(-4px); box-shadow: var(--glow2); }
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--texto);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--texto-muted);
  line-height: 1.6;
}

/* ---- SECCIÓN RECIENTES ---- */
.recientes {
  padding: 6rem 2rem;
  background: var(--fondo);
}

/* ---- LISTA DE PROYECTOS ---- */
.lista-page {
  padding-top: 80px;
  min-height: 100vh;
}

.lista-header {
  background: linear-gradient(180deg, var(--fondo2) 0%, var(--fondo) 100%);
  padding: 5rem 2rem 4rem;
  text-align: center;
  border-bottom: 1px solid var(--borde);
}

.proyectos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.proyecto-card {
  background: var(--tarjeta);
  border: 1px solid var(--borde);
  border-radius: var(--radio-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: var(--trans);
  display: flex;
  flex-direction: column;
  position: relative;
}

.proyecto-card:hover {
  border-color: var(--borde2);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), var(--glow2);
}

.proyecto-card-img {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--fondo3);
}

.proyecto-card-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.proyecto-card:hover .proyecto-card-img img { transform: scale(1.05); }

.proyecto-card-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(5, 13, 5, 0.9) 0%, transparent 50%);
}

.proyecto-card-no-img {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

.proyecto-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.proyecto-card-titulo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--texto);
  margin-bottom: 0.4rem;
  line-height: 1.3;
}

.proyecto-card-subtitulo {
  font-size: 0.875rem;
  color: var(--texto-muted);
  line-height: 1.5;
  flex: 1;
}

.proyecto-card-footer {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--borde);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--texto-muted);
}

.proyecto-card-arrow {
  color: var(--verde);
  font-size: 1.1rem;
  transition: var(--trans);
}

.proyecto-card:hover .proyecto-card-arrow { transform: translateX(4px); }

.vacio {
  text-align: center;
  padding: 5rem 2rem;
  color: var(--texto-muted);
}

.vacio-icon { font-size: 4rem; margin-bottom: 1rem; }
.vacio h3 { font-size: 1.4rem; margin-bottom: 0.5rem; color: var(--texto); }

/* ---- DETALLE PROYECTO ---- */
.detalle-page { padding-top: 80px; }

.detalle-hero {
  position: relative;
  height: 65vh;
  min-height: 400px;
  overflow: hidden;
  background: var(--fondo3);
}

.detalle-hero img {
  width: 100%;
  height: 140%;
  object-fit: cover;
  object-position: center center;
  will-change: transform;
  position: absolute;
  top: -20%;
  left: 0;
}

.detalle-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top,
    rgba(5, 13, 5, 1) 0%,
    rgba(5, 13, 5, 0.6) 40%,
    rgba(5, 13, 5, 0.2) 100%);
}

.detalle-hero-content {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 3rem 4rem;
  max-width: 900px;
}

.detalle-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--texto-muted);
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  transition: var(--trans);
}
.detalle-back:hover { color: var(--verde); }

.detalle-titulo {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 0.75rem;
}

.detalle-subtitulo {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: rgba(200, 240, 200, 0.9);
  font-weight: 400;
  line-height: 1.5;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  max-width: 600px;
  letter-spacing: 0.01em;
}

/* ---- SECCIONES DE DETALLE ---- */
.detalle-body {
  max-width: 820px;
  margin: 0 auto;
  padding: 5rem 2rem 8rem;
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

@keyframes aparecer {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.seccion {
  animation: aparecer 0.5s ease both;
  background: none;
  border: none;
  border-radius: 0;
  overflow: visible;
}

.seccion:nth-child(1) { animation-delay: 0.05s; }
.seccion:nth-child(2) { animation-delay: 0.12s; }
.seccion:nth-child(3) { animation-delay: 0.19s; }
.seccion:nth-child(4) { animation-delay: 0.26s; }
.seccion:nth-child(5) { animation-delay: 0.33s; }
.seccion:nth-child(6) { animation-delay: 0.40s; }
.seccion:nth-child(7) { animation-delay: 0.47s; }

.seccion-header {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0;
  background: none;
  border: none;
  margin-bottom: 1.75rem;
}

.seccion-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}

.seccion-titulo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--texto);
  opacity: 0.9;
}

/* línea decorativa bajo el header */
.seccion-header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(200,240,200,0.12), transparent);
  margin-left: 0.5rem;
}

.seccion-body { padding: 0; }

.seccion-body > p {
  color: rgba(200, 240, 200, 0.75);
  line-height: 1.9;
  font-size: 1.05rem;
}

/* ---- OBSERVACIONES ---- */
.obs-lista {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.obs-item {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0 1.5rem;
  border: none;
  border-radius: 0;
  overflow: visible;
  align-items: start;
}

.obs-numero {
  flex-direction: column;
  padding: 0;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 0;
  padding-top: 0.15rem;
}

.obs-badge {
  width: 2.5rem; height: 2.5rem;
  border-radius: 50%;
  background: none;
  border: 1px solid rgba(200,240,200,0.2);
  color: rgba(200,240,200,0.5);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.obs-content { grid-column: 2; }

.obs-nombre {
  font-weight: 700;
  font-size: 1rem;
  color: var(--texto);
  margin-bottom: 0.6rem;
  display: block;
}

.obs-texto {
  padding: 0;
  color: rgba(200, 240, 200, 0.7);
  line-height: 1.85;
  font-size: 1rem;
}

/* ---- ELABORACION ---- */
.elab-intro {
  color: rgba(200, 240, 200, 0.75);
  line-height: 1.9;
  margin-bottom: 2rem;
  padding-bottom: 0;
  border: none;
  font-size: 1.05rem;
}

.elab-lista {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.elab-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-left: 3px solid rgba(200,240,200,0.25);
  border-radius: 0 var(--radio) var(--radio) 0;
  color: rgba(200, 240, 200, 0.75);
  line-height: 1.8;
  font-size: 1rem;
}

.elab-dot { display: none; }

/* ---- PREGUNTAS ---- */
.preguntas-lista {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.pregunta-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 0;
  background: none;
  border: none;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  border-radius: 0;
  color: rgba(200, 240, 200, 0.75);
  line-height: 1.8;
  font-size: 1rem;
}

.pregunta-item:last-child { border-bottom: none; }

.pregunta-q {
  font-size: 1.3rem;
  font-weight: 900;
  color: rgba(200, 240, 200, 0.25);
  flex-shrink: 0;
  line-height: 1.4;
  font-style: italic;
}

/* ---- GALERÍA ---- */
.galeria {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.galeria-item {
  position: relative;
  border-radius: var(--radio);
  overflow: hidden;
  aspect-ratio: 1;
  background: var(--fondo3);
  cursor: pointer;
}

.galeria-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.galeria-item:hover img { transform: scale(1.08); }

.galeria-item-overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 13, 5, 0.7);
  opacity: 0;
  transition: var(--trans);
  display: flex;
  align-items: flex-end;
  padding: 0.75rem;
}

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

.galeria-pie {
  font-size: 0.8rem;
  color: var(--texto);
  line-height: 1.3;
}

/* ---- LIGHTBOX ---- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.activo { opacity: 1; pointer-events: all; }

.lightbox img {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: var(--radio);
  box-shadow: 0 0 80px rgba(57, 255, 20, 0.2);
}

.lightbox-cerrar {
  position: absolute;
  top: 1.5rem; right: 2rem;
  font-size: 2rem;
  color: var(--texto);
  cursor: pointer;
  background: none;
  border: none;
  transition: var(--trans);
  line-height: 1;
}
.lightbox-cerrar:hover { color: var(--verde); transform: rotate(90deg); }

/* ---- HIPOTESIS / RESULTADO (colores especiales) ---- */
.seccion.hipotesis .seccion-titulo { color: rgba(180, 230, 255, 0.85); }
.seccion.hipotesis .seccion-header::after { background: linear-gradient(90deg, rgba(180,230,255,0.1), transparent); }

.seccion.resultado .seccion-titulo { color: rgba(200, 240, 180, 0.9); }
.seccion.resultado .seccion-header::after { background: linear-gradient(90deg, rgba(200,240,180,0.1), transparent); }


/* ---- FOOTER ---- */
.footer {
  background: var(--fondo2);
  border-top: 1px solid var(--borde);
  padding: 2.5rem 2rem;
  text-align: center;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--verde), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.footer p {
  color: var(--texto-muted);
  font-size: 0.85rem;
}

/* ---- SCROLL REVEAL ---- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .detalle-hero-content { padding: 2rem 1.5rem; }
  .detalle-titulo { font-size: 2rem; }
  .proyectos-grid { grid-template-columns: 1fr; }
  .galeria { grid-template-columns: repeat(2, 1fr); }
}