/* ============================================
   element_E — Laboratorio Lógico
   Paleta real: verde neón (#9dfc44) sobre negro (#020502)
   ============================================ */

:root{
  --neon-green: #9dfc44;
  --glow-green: rgba(157, 252, 68, 0.7);
  --dark-bg: #020502;
  --nav-bg: rgba(0, 5, 0, 0.98);
  --card-bg: rgba(15, 15, 15, 0.95);
  --border-soft: #2a2a2a;
  --text-muted: #b8b8b8;
}

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

html{ scroll-behavior: smooth; }

body, html{
  min-height: 100%;
  font-family: 'Segoe UI', Roboto, sans-serif;
  background-color: var(--dark-bg);
  color: #fff;
  overflow-x: hidden;
}

a{ text-decoration:none; color:inherit; }
img{ max-width:100%; display:block; }
ul{ list-style:none; }

/* ---------- INTRO (se muestra una vez por sesión) ---------- */
#intro-screen{
  position: fixed; inset: 0;
  display:flex; flex-direction:column; justify-content:center; align-items:center;
  background: var(--dark-bg);
  z-index: 5000;
  transition: opacity 0.8s ease;
}
.logo-intro{
  width: 180px; height: 180px;
  border-radius: 50%;
  border: 4px solid var(--neon-green);
  animation: pulse 2s infinite ease-in-out;
  object-fit: cover;
}
.intro-title{
  color: var(--neon-green);
  margin-top: 22px;
  letter-spacing: 5px;
  font-size: 20px;
}
@keyframes pulse{
  0%, 100%{ transform: scale(1); box-shadow: 0 0 20px var(--neon-green); }
  50%{ transform: scale(1.05); box-shadow: 0 0 55px var(--neon-green); }
}

/* ---------- NAV (links reales, no botones JS) ---------- */
nav.main-nav{
  position: sticky; top:0; width:100%;
  background: var(--nav-bg);
  border-bottom: 2px solid var(--neon-green);
  display:flex; justify-content: space-between; align-items:center;
  padding: 10px 20px;
  z-index: 900;
  flex-wrap: wrap;
  gap: 10px;
}
.nav-logo-link{ display:flex; align-items:center; gap:10px; }
.nav-logo{
  height: 42px; width:42px;
  border-radius: 50%;
  border: 1px solid var(--neon-green);
  object-fit: cover;
}
.nav-brand-text{
  font-weight: 800;
  letter-spacing: 1px;
  font-size: 15px;
}
.nav-links{ display:flex; flex-wrap: wrap; gap: 4px; }
.nav-links a{
  padding: 10px 14px;
  cursor:pointer;
  text-transform: uppercase;
  font-weight: bold;
  font-size: 12.5px;
  letter-spacing: 0.5px;
  border-bottom: 2px solid transparent;
  transition: 0.25s ease;
  border-radius: 4px;
}
.nav-links a:hover,
.nav-links a.active{
  color: var(--neon-green);
  border-bottom-color: var(--neon-green);
  text-shadow: 0 0 10px var(--glow-green);
}

.nav-toggle{
  display:none;
  background:none;
  border: 1px solid var(--neon-green);
  color: var(--neon-green);
  font-size: 18px;
  padding: 6px 12px;
  border-radius: 6px;
  cursor:pointer;
}

/* ---------- HERO (portada / inicio) ---------- */
.hero{
  min-height: 82vh;
  display:flex; flex-direction: column; justify-content:center; align-items:center;
  text-align:center;
  padding: 60px 20px;
  border-radius: 20px;
  border: 2px solid var(--neon-green);
  margin: 20px;
  box-shadow: 0 0 30px rgba(157,252,68,0.15);
  background:
    radial-gradient(circle at 30% 20%, rgba(157,252,68,0.08), transparent 50%),
    radial-gradient(circle at 70% 85%, rgba(157,252,68,0.06), transparent 50%);
}
.hero img.hero-logo{
  width: 130px;
  margin-bottom: 22px;
  border-radius: 50%;
  border: 2px solid var(--neon-green);
}
.hero h1{
  color: var(--neon-green);
  font-size: clamp(26px, 5vw, 46px);
  text-transform: uppercase;
  margin-bottom: 14px;
  text-shadow: 0 0 15px rgba(0,0,0,0.8);
}
.hero p{
  color: var(--text-muted);
  max-width: 600px;
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 30px;
}
.hero-cta{ display:flex; gap:16px; flex-wrap: wrap; justify-content:center; }

.btn{
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor:pointer;
  border: 2px solid var(--neon-green);
  transition: all 0.2s ease;
}
.btn-primary{
  background: var(--neon-green);
  color: #020502;
}
.btn-primary:hover{ box-shadow: 0 0 25px var(--glow-green); transform: translateY(-2px); }
.btn-secondary{
  background: transparent;
  color: var(--neon-green);
}
.btn-secondary:hover{ box-shadow: 0 0 20px var(--glow-green); transform: translateY(-2px); }

/* ---------- GRID DE HERRAMIENTAS ---------- */
.tools-section{ padding: 50px 20px 80px; max-width: 1200px; margin: 0 auto; }
.tools-section h2{ text-align:center; color: var(--neon-green); font-size: 22px; text-transform:uppercase; margin-bottom: 8px; }
.tools-section .sub{ text-align:center; color: var(--text-muted); margin-bottom: 36px; font-size: 13px; }

.grid{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}
.card{
  background: var(--card-bg);
  border: 1px solid var(--border-soft);
  padding: 26px 20px;
  border-radius: 14px;
  text-align:center;
  transition: 0.3s ease;
}
.card:hover{
  border-color: var(--neon-green);
  box-shadow: 0 0 20px rgba(157,252,68,0.2);
  transform: translateY(-4px);
}
.card .icon{ font-size: 32px; margin-bottom: 12px; }
.card h3{ font-size: 14px; text-transform: uppercase; margin-bottom: 8px; letter-spacing: 0.5px; }
.card p{ font-size: 12.5px; color: var(--text-muted); line-height: 1.5; }

/* ---------- FOOTER ---------- */
footer.site-footer{
  border-top: 1px solid var(--border-soft);
  padding: 26px 20px;
  text-align:center;
  font-size: 12px;
  color: var(--text-muted);
}
footer.site-footer .brand-e{ color: var(--neon-green); }

/* ---------- PÁGINAS INTERNAS (placeholder) ---------- */
.placeholder-page{
  min-height: 70vh;
  display:flex; flex-direction: column; align-items:center; justify-content:center;
  text-align:center;
  padding: 60px 24px;
}
.placeholder-page h1{
  color: var(--neon-green);
  font-size: 30px;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.placeholder-page p{
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.6;
  margin-bottom: 26px;
}
.badge-proximamente{
  display:inline-block;
  padding: 6px 18px;
  border-radius: 999px;
  border: 1px solid var(--neon-green);
  color: var(--neon-green);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 860px){
  .nav-links{
    position:absolute; top: 64px; left:0; right:0;
    flex-direction: column;
    background: var(--nav-bg);
    border-bottom: 2px solid var(--neon-green);
    padding: 10px;
    display:none;
  }
  .nav-links.open{ display:flex; }
  .nav-toggle{ display:inline-block; }
}