:root{
    --bg:#0A0A0F;
    --surface:#12121A;
    --accent:#7B61FF;
    --accent2:#00D4FF;
    --text:#E8E8F0;
    --muted:rgba(232,232,240,0.5);
    --border:rgba(232,232,240,0.08);
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{background:var(--bg);color:var(--text);font-family:'Inter',sans-serif;overflow-x:hidden;}
  .display{font-family:'Space Grotesk',sans-serif;}
  .mono{font-family:'JetBrains Mono',monospace;}

  /* NAV */
  nav{
    position:fixed;top:0;left:0;right:0;z-index:100;
    padding:1.2rem 6vw;
    display:flex;justify-content:space-between;align-items:center;
    background:rgba(10,10,15,0.85);
    backdrop-filter:blur(12px);
    border-bottom:1px solid var(--border);
  }
  .nav-logo{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1rem;color:var(--text);text-decoration:none;}
  .nav-logo span{color:var(--accent);}
  .nav-links{display:flex;gap:2rem;list-style:none;}
  .nav-links a{font-size:0.85rem;color:var(--muted);text-decoration:none;letter-spacing:0.03em;transition:color 0.2s;}
  .nav-links a:hover{color:var(--text);}

  /* SCROLL VIDEO */
  .video-scroll{position:relative;height:250vh;}
  .video-pin{position:fixed;top:0;left:0;width:100%;height:100vh;z-index:1;overflow:hidden;}
  #portfolioCanvas{width:100%;height:100%;display:block;filter:brightness(0.65) saturate(1.1);}
  .video-overlay{
    position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(10,10,15,0.2) 0%,rgba(10,10,15,0.0) 30%,rgba(10,10,15,0.98) 100%);
  }

  /* IMAGE SECTIONS — sin fondo, la imagen flota sobre el bg de la web */
  .img-section{
    position:relative;z-index:5;
    padding:3vh 6vw;
    background:transparent;
  }
  .img-section img{width:100%;display:block;border-radius:16px;}

  /* SECTION LABEL */
  .section-label{
    font-family:'JetBrains Mono',monospace;font-size:0.7rem;
    text-transform:uppercase;letter-spacing:0.18em;
    color:var(--accent);margin-bottom:0.7rem;display:block;
  }

  /* CONTENT CARD — usado por FAQ y Contact */
  .content-card-section{
    position:relative;z-index:5;
    padding:4vh 6vw;
    background:transparent;
  }
  .content-card{
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:24px;
    padding:4rem 4rem;
  }

  /* FAQ */
  .faq-list{margin-top:2rem;max-width:820px;}
  .faq-item{border-bottom:1px solid var(--border);}
  .faq-q{
    width:100%;background:none;border:none;color:var(--text);
    font-family:'Space Grotesk',sans-serif;font-size:1rem;font-weight:500;
    text-align:left;padding:1.3rem 0;cursor:pointer;
    display:flex;justify-content:space-between;align-items:center;gap:1rem;
    transition:color 0.2s;
  }
  .faq-q:hover{color:var(--accent);}
  .faq-q .chevron{flex-shrink:0;width:17px;height:17px;color:var(--muted);transition:transform 0.3s ease,color 0.2s;}
  .faq-item.open .chevron{transform:rotate(180deg);color:var(--accent);}
  .faq-a{max-height:0;overflow:hidden;transition:max-height 0.35s ease;}
  .faq-a p{font-size:0.93rem;color:var(--muted);line-height:1.7;padding-bottom:1.3rem;}
  .faq-a strong{color:var(--accent2);font-weight:500;}

  /* CONTACT */
  .contact-inner{text-align:center;}
  .contact-inner h2{font-family:'Space Grotesk',sans-serif;font-size:clamp(2rem,4.5vw,3.2rem);font-weight:700;margin:0.5rem 0 1rem;}
  .contact-inner > p{color:var(--muted);font-size:1rem;max-width:46ch;margin:0 auto 3rem;line-height:1.6;}
  .contact-links{display:flex;flex-wrap:wrap;gap:0.9rem;justify-content:center;margin-bottom:2.5rem;}
  .contact-link{
    display:inline-flex;align-items:center;gap:0.55rem;
    padding:0.75rem 1.3rem;border:1px solid var(--border);border-radius:6px;
    color:var(--text);text-decoration:none;font-size:0.88rem;font-weight:500;
    transition:all 0.25s ease;background:rgba(255,255,255,0.03);
  }
  .contact-link:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);}
  .contact-link svg{width:15px;height:15px;flex-shrink:0;}
  .btn-cta{
    display:inline-flex;align-items:center;gap:0.6rem;
    padding:1rem 2.4rem;
    background:linear-gradient(135deg,var(--accent),#5b47e0);
    color:#fff;border:none;border-radius:6px;
    font-family:'Space Grotesk',sans-serif;font-size:1rem;font-weight:600;
    cursor:pointer;text-decoration:none;
    transition:transform 0.2s,box-shadow 0.2s;
    box-shadow:0 4px 20px rgba(123,97,255,0.3);
  }
  .btn-cta:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(123,97,255,0.4);}

  footer{
    padding:2rem 6vw;border-top:1px solid var(--border);
    display:flex;justify-content:space-between;align-items:center;
    font-size:0.75rem;color:var(--muted);background:var(--surface);
  }

  /* CASE STUDY */
  .cs-card{
    display:grid;
    grid-template-columns:1fr 1.6fr;
    gap:3vw;
    align-items:start;
  }
  /* info panel izquierda */
  .cs-title{
    font-family:'Space Grotesk',sans-serif;
    font-size:clamp(1.6rem,2.5vw,2.2rem);font-weight:700;
    margin-bottom:1.4rem;
  }
  .cs-meta{
    display:grid;grid-template-columns:1fr 1fr;gap:0.5rem 1.5rem;
    margin-bottom:1.8rem;
    padding:1.1rem 1.3rem;
    background:rgba(123,97,255,0.06);
    border:1px solid rgba(123,97,255,0.15);
    border-radius:12px;
  }
  .cs-meta-item .lbl{
    font-family:'JetBrains Mono',monospace;font-size:0.62rem;
    text-transform:uppercase;letter-spacing:0.12em;
    color:var(--accent);margin-bottom:0.15rem;display:block;
  }
  .cs-meta-item .val{font-size:0.86rem;color:var(--text);}
  .tech-chips{display:flex;flex-wrap:wrap;gap:0.4rem;margin-bottom:1.8rem;}
  .chip{
    font-size:0.68rem;font-family:'JetBrains Mono',monospace;
    padding:0.22rem 0.6rem;
    border:1px solid rgba(123,97,255,0.35);border-radius:3px;
    color:var(--accent);letter-spacing:0.04em;
  }
  .cs-block{
    margin-bottom:1.2rem;padding:1.1rem 1.3rem;
    background:rgba(255,255,255,0.02);
    border:1px solid var(--border);border-radius:12px;
  }
  .cs-block-title{
    font-size:0.72rem;font-weight:600;text-transform:uppercase;
    letter-spacing:0.1em;color:var(--accent2);
    font-family:'JetBrains Mono',monospace;margin-bottom:0.6rem;
  }
  .cs-block p{font-size:0.88rem;color:var(--muted);line-height:1.7;margin-bottom:0.5rem;}
  .cs-block p:last-child{margin-bottom:0;}
  .cs-block ul{list-style:none;display:flex;flex-direction:column;gap:0.4rem;}
  .cs-block ul li{
    font-size:0.86rem;color:var(--muted);line-height:1.6;
    padding-left:1.1rem;position:relative;
  }
  .cs-block ul li::before{content:'→';position:absolute;left:0;color:var(--accent);font-size:0.72rem;top:3px;}
  .cs-block.outcome ul li::before{content:'✔';color:#4ade80;}
  .cs-block.outcome ul li{color:var(--text);}

  /* carousel derecha */
  .cs-visual{position:sticky;top:80px;}
  .cs-carousel{
    position:relative;width:100%;aspect-ratio:9/16;
    border-radius:14px;overflow:hidden;
    background:var(--surface);border:1px solid var(--border);
  }
  /* imágenes apiladas en columna */
  .cs-carousel img{
    position:absolute;inset:0;width:100%;height:100%;object-fit:contain;
    opacity:0;transition:opacity 0.45s ease,transform 0.45s ease;
    transform:translateX(40px);
  }
  .cs-carousel img.active{opacity:1;transform:translateX(0);}
  .cs-carousel img.out-left{opacity:0;transform:translateX(-40px);}
  .cs-dots{display:flex;gap:6px;justify-content:center;margin-top:0.8rem;}
  .cs-dot{
    width:7px;height:7px;border-radius:50%;
    background:var(--border);border:1px solid rgba(232,232,240,0.2);
    cursor:pointer;transition:background 0.3s,transform 0.2s;
  }
  .cs-dot.active{background:var(--accent);transform:scale(1.3);border-color:var(--accent);}
  .cs-images{display:flex;flex-direction:column;gap:1.2rem;}
  .cs-img-card{
    border-radius:14px;overflow:hidden;
    border:1px solid var(--border);
    background:var(--surface);
  }
  .cs-img-card img{
    width:100%;display:block;
    object-fit:contain;
    transition:transform 0.4s ease;
  }
  .cs-img-card:hover img{transform:scale(1.04);}

  @media(max-width:900px){
    .cs-card{grid-template-columns:1fr;}
    .cs-visual{position:relative;top:auto;}
    .cs-carousel{aspect-ratio:16/9;}
  }

  @media(max-width:900px){
    .nav-links{display:none;}
    .content-card{padding:2.5rem 1.8rem;}
    footer{flex-direction:column;gap:0.5rem;text-align:center;}
  }
  .yt-thumb{cursor:pointer;}
  .yt-thumb:hover img{transform:scale(1.04);}
  .yt-play{
    position:absolute;inset:0;
    display:flex;align-items:center;justify-content:center;
    transition:opacity 0.2s;
  }
  .yt-thumb:hover .yt-play{opacity:0.8;}