:root{--bg:#0A0A0A;--text:#FAFAFA;--silver:#B8B8C0;--accent:#6d4aff}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:'Inter',sans-serif;font-weight:300;line-height:1.6;overflow-x:hidden}
h1,h2,h3{font-family:'Space Grotesk',sans-serif}

header{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;justify-content:space-between;align-items:center;padding:1.5rem 3rem;mix-blend-mode:difference}
.logo{display:flex;align-items:center;gap:.8rem;text-decoration:none}
.logo svg{flex-shrink:0}
.logo span{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.1rem;letter-spacing:.2em;color:var(--text)}
nav a{color:var(--silver);text-decoration:none;font-size:.8rem;letter-spacing:.15em;margin-left:2rem;text-transform:uppercase;transition:color .3s}
nav a:hover{color:var(--accent)}

/* HERO con ciudad 3D */
.hero{height:100vh;position:relative;overflow:hidden}
.hero-fallback{position:absolute;inset:0;background:url('../img/proyecto1.jpg') center/cover;opacity:.4;filter:saturate(.7)}
#city{position:absolute;inset:0;cursor:grab;touch-action:pan-y}
#city:active{cursor:grabbing}
.hero-content{position:absolute;inset:0;z-index:2;display:flex;flex-direction:column;justify-content:flex-end;padding:0 3rem 5.5rem;pointer-events:none}
.kicker{font-size:.75rem;letter-spacing:.25em;text-transform:uppercase;color:var(--silver);margin-bottom:1rem}
.hero h1{font-size:clamp(3.5rem,12vw,10rem);font-weight:700;letter-spacing:-.02em;line-height:.95;text-shadow:0 4px 40px rgba(0,0,0,.8)}
.hero .tagline{max-width:560px;margin-top:1.5rem;color:var(--silver);font-size:1.05rem;text-shadow:0 2px 20px rgba(0,0,0,.8)}
.hero .hint{margin-top:.8rem;font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(184,184,192,.55)}

.chapter{min-height:100vh;display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid rgba(109,74,255,.35)}
.chapter .visual{position:relative;overflow:hidden;min-height:60vh}
.chapter .visual img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s ease}
.chapter:hover .visual img{transform:scale(1.04)}
.chapter .content{display:flex;flex-direction:column;justify-content:center;padding:6rem 5rem}
.chapter:nth-child(even) .visual{order:2}
.num{font-family:'Space Grotesk',sans-serif;font-size:.75rem;letter-spacing:.25em;color:var(--accent);text-transform:uppercase;margin-bottom:1.5rem}
.chapter h2{font-size:clamp(2.2rem,4.5vw,3.8rem);font-weight:700;margin-bottom:1.5rem}
.chapter p{color:var(--silver);max-width:420px}

.caps{padding:10rem 3rem;border-bottom:1px solid rgba(109,74,255,.35)}
.caps .num{margin-bottom:3rem}
.cap-list{list-style:none;max-width:1100px;margin:0 auto}
.cap-list li{display:flex;justify-content:space-between;align-items:baseline;padding:1.8rem 0;border-bottom:1px solid rgba(184,184,192,.15);font-family:'Space Grotesk',sans-serif;font-size:clamp(1.4rem,3vw,2.4rem);font-weight:500;transition:padding-left .3s,color .3s}
.cap-list li:hover{padding-left:1.5rem;color:var(--accent)}
.cap-list li span{font-family:'Inter',sans-serif;font-size:.8rem;font-weight:300;letter-spacing:.1em;color:var(--silver);text-transform:uppercase}

.cta{min-height:90vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:6rem 2rem}
.cta h2{font-size:clamp(3rem,8vw,7rem);font-weight:700;letter-spacing:-.02em;margin-bottom:2.5rem}
.btn{display:inline-block;background:var(--accent);color:var(--text);text-decoration:none;font-family:'Space Grotesk',sans-serif;font-weight:500;letter-spacing:.1em;padding:1.2rem 3.2rem;border-radius:999px;font-size:1rem;transition:transform .3s,box-shadow .3s}
.btn:hover{transform:translateY(-3px);box-shadow:0 10px 40px rgba(109,74,255,.45)}

footer{padding:2rem 3rem;display:flex;justify-content:space-between;align-items:center;font-size:.75rem;letter-spacing:.1em;color:var(--silver);border-top:1px solid rgba(184,184,192,.1)}
footer .foot-logo{display:flex;align-items:center;gap:.5rem}

.reveal{opacity:0;transform:translateY(40px);transition:opacity .9s ease,transform .9s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

@media(max-width:800px){
  header{padding:1.2rem 1.5rem}
  nav a{margin-left:1rem;font-size:.7rem}
  .hero-content{padding:0 1.5rem 4.5rem}
  .chapter{grid-template-columns:1fr}
  .chapter:nth-child(even) .visual{order:0}
  .chapter .content{padding:3rem 1.5rem}
  .caps{padding:5rem 1.5rem}
}