:root{
  --bg:#000;
  --overlay:rgba(0,0,0,.65);
  --card:rgba(255,255,255,.05);
  --border:rgba(0,224,255,.25);
  --accent:#00e0ff;
  --accent-soft:#00b9d8;
  --text:#e2e8f0;
  --muted:#8be8ff;
  --radius:8px;
  --blur:6px;
  --shadow:0 4px 12px rgba(0,0,0,.55);
  --transition:.25s ease;
  --font-sans:'Inter',sans-serif;
  --font-display:'Orbitron',sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:var(--font-sans);background:var(--bg);color:var(--text);overflow-x:hidden}

a{color:var(--accent);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--accent-soft)}

.container{width:90%;max-width:1200px;margin:0 auto}

#matrix{position:fixed;inset:0;z-index:-2}

header{
  position:sticky;top:0;z-index:1000;
  background:rgba(0,0,0,.75);
  border-bottom:1px solid var(--border);
  backdrop-filter:blur(var(--blur));
  box-shadow:var(--shadow);
}
header .container{display:flex;align-items:center;justify-content:space-between;padding:.9rem 0}
.logo{font-family:var(--font-display);font-size:1.7rem;color:var(--accent);letter-spacing:1px}
nav{display:flex;gap:1.25rem;align-items:center;flex-wrap:wrap}
nav a{font-weight:500;position:relative}
nav a::after{content:'';position:absolute;left:0;bottom:-4px;width:0;height:2px;background:var(--accent);transition:var(--transition)}
nav a:hover::after{width:100%}
#nav-toggle{display:none;background:none;border:none;font-size:1.8rem;color:var(--accent)}
@media(max-width:768px){
   nav{display:none;flex-direction:column;align-items:flex-start;width:100%;
        background:rgba(0,0,0,.9);position:absolute;top:64px;left:0;padding:1rem 5%}
   nav.open{display:flex}
   #nav-toggle{display:block}
}

.hero{
  background:var(--overlay);
  text-align:center;
  padding:7rem 0 8rem;
}
.hero h1{
  font-family:var(--font-display);
  font-size:2.9rem;
  color:var(--accent);
  margin-bottom:1rem;
}
.hero p{max-width:720px;margin:.75rem auto;font-size:1.1rem}

.scroll-mouse{
  width:24px;height:38px;border:2px solid var(--accent);border-radius:14px;
  position:absolute;left:50%;bottom:1.3rem;transform:translateX(-50%);
}
.scroll-mouse::before{
  content:'';display:block;width:4px;height:6px;border-radius:50%;background:var(--accent);
  margin:6px auto 0;
  animation:scroll 2s infinite ease-in-out;
}
@keyframes scroll{0%{opacity:1;transform:translateY(0)}
  50%{opacity:.3;transform:translateY(10px)}
  100%{opacity:1;transform:translateY(0)}}

section{padding:4.5rem 0}
h2{font-family:var(--font-display);color:var(--accent);text-align:center;margin-bottom:2.5rem}

.dark{background:var(--overlay)}

.grid{display:grid;gap:1.7rem}
.features .grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.5rem;box-shadow:var(--shadow);backdrop-filter:blur(var(--blur));
  transition:var(--transition)
}
.card:hover{transform:translateY(-6px);border-color:var(--accent)}
.card h3{color:var(--accent-soft);margin-bottom:.6rem;font-family:var(--font-display)}

.timeline{display:grid;gap:2rem}
.timeblock{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
           padding:1.6rem}
.timeblock h3{margin-bottom:1rem;color:var(--accent);font-family:var(--font-display)}
.timeblock span{font-size:.9rem;color:var(--muted)}

.accordion .item{margin-bottom:1rem;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.accordion .question{width:100%;padding:1rem;text-align:left;background:none;color:var(--accent);font-weight:600;border:none;cursor:pointer}
.accordion .answer{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 1rem}
.accordion .item.open .answer{max-height:220px;padding:1rem}

blockquote{background:var(--card);border-left:4px solid var(--accent);padding:1rem 1.25rem}
cite{display:block;margin-top:.6rem;color:var(--muted)}

.socials{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1rem}
.socials a{background:var(--accent);color:#000;padding:.45rem .9rem;border-radius:var(--radius);
          font-size:.85rem;font-weight:600;transition:var(--transition)}
.socials a:hover{background:var(--accent-soft)}

#backTop{position:fixed;bottom:24px;right:24px;width:46px;height:46px;background:var(--accent);color:#000;border:none;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .3s ease;}
#backTop.show{opacity:1;pointer-events:auto}

footer{background:rgba(0,0,0,.8);padding:1.2rem 0;text-align:center;color:var(--muted);font-size:.9rem;border-top:1px solid var(--border)}

/* ==== Zero Spin Image ==== */
@keyframes zeroTwirl{
  0%{transform:rotate(0deg) scale(.8);opacity:0;}
  75%{transform:rotate(360deg) scale(1.05);}
  100%{transform:rotate(360deg) scale(1);opacity:1;}
}
.zero-twirl{
  width:120px;aspect-ratio:1/1;object-fit:cover;border-radius:8px;
  animation:zeroTwirl 1.4s cubic-bezier(.26,.71,.34,1.02) forwards;
  margin:1.8rem auto 0;
  display:block;
}

/* ==== Talk to Zero widget ==== */
#zeroChatBtn{#zeroChatBtn{
  position:fixed;bottom:24px;left:24px;width:64px;height:64px;border-radius:50%;
  background:var(--accent);color:#000;font-weight:bold;font-size:28px;display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 14px rgba(0,224,255,.8);cursor:pointer;z-index:1100;
  animation:pulse 2.5s infinite ease-in-out;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 14px rgba(0,224,255,.8);}
  50%{box-shadow:0 0 28px rgba(0,224,255,1);}
}
#zeroModal{
  position:fixed;inset:0;background:rgba(0,0,0,.88);backdrop-filter:blur(4px);display:none;z-index:1200;
}
#zeroModal.open{display:flex;align-items:center;justify-content:center;}
#zeroModal iframe{
  width:min(90%,1100px);height:85vh;border:2px solid var(--accent);border-radius:8px;box-shadow:0 0 22px rgba(0,224,255,.45);
}
#zeroModal .close{
  position:absolute;top:22px;right:32px;font-size:32px;color:var(--accent);cursor:pointer;
}