:root{
    --bg: #050B18;
    --bg-elevated: #0A1224;
    --bg-card: #0D1528;
    --line: #1E293B;
    --blue: #007AFF;
    --violet: #8B5CF6;
    --green: #10B981;
    --gold: #F59E0B;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-tertiary: #64748B;
    --grad: linear-gradient(135deg, #007AFF 0%, #8B5CF6 100%);
  }

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

  html{scroll-behavior:smooth;}

  body{
    background:var(--bg);
    color:var(--text-primary);
    font-family:'Inter',sans-serif;
    overflow-x:hidden;
  }

  h1,h2,h3,.display{
    font-family:'Sora',sans-serif;
    letter-spacing:-0.02em;
  }

  .mono{
    font-family:'JetBrains Mono',monospace;
    letter-spacing:0.08em;
    text-transform:uppercase;
    font-size:0.72rem;
  }

  .wrap{
    max-width:1120px;
    margin:0 auto;
    padding:0 32px;
  }

  section{
    position:relative;
    padding:120px 0;
  }

  /* ============ NAV ============ */
  nav{
    position:fixed;
    top:0; left:0; right:0;
    z-index:100;
    padding:22px 0;
    background:rgba(11,14,26,0.7);
    backdrop-filter:blur(16px);
    border-bottom:1px solid transparent;
    transition:border-color 0.3s;
  }
  nav.scrolled{border-bottom-color:var(--line);}
  .nav-inner{
    max-width:1120px;
    margin:0 auto;
    padding:0 32px;
    display:flex;
    align-items:center;
    justify-content:space-between;
  }
  .nav-brand{
    display:flex;
    align-items:center;
    gap:10px;
    font-weight:700;
    font-size:1.05rem;
  }
  .nav-brand .dot{
    width:8px;height:8px;border-radius:50%;
    background:var(--grad);
  }
  .logo-img{
    width:30px;height:30px;
    border-radius:8px;
    object-fit:cover;
  }
  .nav-links{
    display:flex;
    gap:36px;
    font-size:0.9rem;
    color:var(--text-secondary);
  }
  .nav-links a{color:inherit;text-decoration:none;transition:color 0.2s;}
  .nav-links a:hover{color:var(--text-primary);}
  

  /* ============ HERO ============ */
  .hero{
    min-height:100vh;
    display:flex;
    align-items:center;
    padding-top:100px;
    background:
      radial-gradient(ellipse 60% 50% at 80% 10%, rgba(155,92,255,0.16), transparent),
      radial-gradient(ellipse 50% 40% at 10% 30%, rgba(59,155,250,0.12), transparent);
  }
  .hero-grid{
    display:grid;
    grid-template-columns:1.1fr 0.9fr;
    gap:60px;
    align-items:center;
  }
  @media (max-width:900px){.hero-grid{grid-template-columns:1fr;}}

  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    color:var(--blue);
    margin-bottom:24px;
  }
  .eyebrow::before{
    content:'';
    width:16px;height:1px;
    background:var(--blue);
  }

  .hero h1{
    font-size:clamp(2.6rem, 5.5vw, 4.4rem);
    font-weight:700;
    line-height:1.04;
    margin-bottom:24px;
  }
  .hero h1 .grad-text{
    background:var(--grad);
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent;
  }

  .hero p.lead{
    font-size:1.1rem;
    color:var(--text-secondary);
    line-height:1.65;
    max-width:480px;
    margin-bottom:36px;
  }

  .btn-row{display:flex;gap:16px;flex-wrap:wrap;}
  .btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:14px 26px;
    border-radius:10px;
    font-size:0.92rem;
    font-weight:600;
    text-decoration:none;
    transition:transform 0.2s, box-shadow 0.2s;
  }
  .btn-primary{
    background:var(--grad);
    color:#fff;
    box-shadow:0 8px 24px -8px rgba(155,92,255,0.5);
  }
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px -8px rgba(155,92,255,0.6);}
  .btn-ghost{
    background:transparent;
    color:var(--text-primary);
    border:1px solid var(--line);
  }
  .btn-ghost:hover{border-color:var(--text-tertiary);}

  .stat-row{
    display:flex;
    gap:40px;
    margin-top:56px;
    flex-wrap:wrap;
  }
  .stat-num{
    font-family:'Sora',sans-serif;
    font-size:1.9rem;
    font-weight:700;
  }
  .stat-label{
    color:var(--text-tertiary);
    font-size:0.82rem;
    margin-top:2px;
  }

  /* ============ HAND SVG VISUAL ============ */
  .hand-visual{
    position:relative;
    display:flex;
    justify-content:center;
    align-items:center;
  }
  .hand-visual svg{width:100%;max-width:420px;height:auto;}
  .landmark-dot{
    fill:var(--blue);
    filter:drop-shadow(0 0 6px rgba(59,155,250,0.7));
  }
  .landmark-dot.violet{fill:var(--violet);filter:drop-shadow(0 0 6px rgba(155,92,255,0.7));}
  .landmark-line{
    stroke:rgba(255,255,255,0.25);
    stroke-width:1.4;
    fill:none;
  }
  .pulse{
    animation:pulse 2.4s ease-in-out infinite;
  }
  @keyframes pulse{
    0%,100%{r:3.2; opacity:0.9;}
    50%{r:4.6; opacity:0.4;}
  }
  .hand-outline{
    stroke:rgba(255,255,255,0.14);
    stroke-width:1.5;
    fill:none;
  }
  .scan-line{
    stroke:var(--violet);
    stroke-width:1;
    opacity:0.5;
    animation:scan 3s ease-in-out infinite;
  }
  .det-box path{
    stroke:rgba(255,255,255,0.3);
    stroke-width:2;
    fill:none;
    stroke-linecap:round;
  }
  .det-label{
    font-family:'JetBrains Mono',monospace;
    font-size:11px;
    letter-spacing:0.08em;
    fill:var(--text-tertiary);
  }
  @keyframes scan{
    0%{transform:translateY(-80px); opacity:0;}
    15%{opacity:0.6;}
    85%{opacity:0.6;}
    100%{transform:translateY(80px); opacity:0;}
  }

  /* ============ SECTION HEADERS ============ */
  .sec-head{
    max-width:640px;
    margin-bottom:64px;
  }
  .sec-head .eyebrow{margin-bottom:18px;}
  .sec-head h2{
    font-size:clamp(1.8rem,3.4vw,2.6rem);
    font-weight:700;
    line-height:1.15;
    margin-bottom:16px;
  }
  .sec-head p{
    color:var(--text-secondary);
    font-size:1.02rem;
    line-height:1.65;
  }

  /* ============ PROBLEM SECTION ============ */
  .problem-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    border-radius:16px;
    overflow:hidden;
  }
  @media (max-width:800px){.problem-grid{grid-template-columns:1fr;}}
  .problem-card{
    background:var(--bg-elevated);
    padding:36px 32px;
  }
  .problem-card .num{
    font-family:'JetBrains Mono',monospace;
    color:var(--text-tertiary);
    font-size:0.8rem;
    margin-bottom:20px;
    display:block;
  }
  .problem-card h3{
    font-size:1.15rem;
    font-weight:600;
    margin-bottom:10px;
  }
  .problem-card p{
    color:var(--text-secondary);
    font-size:0.92rem;
    line-height:1.6;
  }

  /* ============ PIPELINE (HOW IT WORKS) ============ */
  .pipeline{
    position:relative;
  }
  .pipeline-track{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:0;
    position:relative;
  }
  @media (max-width:900px){.pipeline-track{grid-template-columns:1fr;gap:32px;}}
  .pipeline-track::before{
    content:'';
    position:absolute;
    top:34px;
    left:6%;
    right:6%;
    height:1px;
    background:linear-gradient(90deg, transparent, var(--line) 10%, var(--line) 90%, transparent);
  }
  @media (max-width:900px){.pipeline-track::before{display:none;}}
  .pipe-step{
    position:relative;
    padding:0 20px;
    text-align:left;
  }
  .pipe-icon{
    width:68px;height:68px;
    border-radius:16px;
    background:var(--bg-card);
    border:1px solid var(--line);
    display:flex;
    align-items:center;
    justify-content:center;
    margin-bottom:24px;
    position:relative;
    z-index:2;
    font-family:'JetBrains Mono',monospace;
    font-size:0.72rem;
    color:var(--blue);
  }
  .pipe-step h3{
    font-size:1.05rem;
    font-weight:600;
    margin-bottom:8px;
  }
  .pipe-step p{
    color:var(--text-secondary);
    font-size:0.88rem;
    line-height:1.6;
  }
  .pipe-arrow{
    display:none;
    position:absolute;
    right:-14px;
    top:26px;
    color:var(--text-tertiary);
  }
  @media (min-width:901px){.pipe-arrow{display:block;}}

  /* ============ FEATURES ============ */
  .feature-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
  }
  @media (max-width:900px){.feature-grid{grid-template-columns:1fr 1fr;}}
  @media (max-width:600px){.feature-grid{grid-template-columns:1fr;}}
  .feature-card{
    background:var(--bg-card);
    border:1px solid var(--line);
    border-radius:14px;
    padding:28px;
    transition:border-color 0.25s, transform 0.25s;
  }
  .feature-card:hover{
    border-color:rgba(155,92,255,0.4);
    transform:translateY(-3px);
  }
  .feature-card:hover .feature-icon{
    border-color:rgba(155,92,255,0.5);
  }
  .feature-icon{
    width:52px;height:52px;
    border-radius:12px;
    background:var(--bg-elevated);
    border:1px solid var(--line);
    margin-bottom:18px;
    display:flex;align-items:center;justify-content:center;
    padding:10px;
  }
  .feature-icon img{
    width:100%;height:100%;
    object-fit:contain;
  }
  .feature-card h3{
    font-size:1rem;
    font-weight:600;
    margin-bottom:8px;
  }
  .feature-card p{
    color:var(--text-secondary);
    font-size:0.88rem;
    line-height:1.6;
  }

  /* ============ CONTEXT / BUILT FOR ============ */
  .context-panel{
    background:var(--bg-elevated);
    border:1px solid var(--line);
    border-radius:20px;
    padding:56px;
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:48px;
    align-items:center;
  }
  @media (max-width:800px){.context-panel{grid-template-columns:1fr;padding:36px 28px;}}
  .context-panel h2{
    font-size:1.7rem;
    margin-bottom:16px;
  }
  .context-panel p{
    color:var(--text-secondary);
    line-height:1.7;
    font-size:0.98rem;
  }
  .context-tag-row{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-top:24px;
  }
  .tag{
    font-family:'JetBrains Mono',monospace;
    font-size:0.72rem;
    padding:7px 14px;
    border-radius:20px;
    border:1px solid var(--line);
    color:var(--text-secondary);
  }
  .context-visual{
    aspect-ratio:1/1;
    border-radius:16px;
    background:
      radial-gradient(circle at 30% 30%, rgba(0,122,255,0.25), transparent 60%),
      radial-gradient(circle at 70% 70%, rgba(139,92,246,0.25), transparent 60%);
    border:1px solid var(--line);
    display:flex;
    align-items:center;
    justify-content:center;
    overflow:hidden;
    position:relative;
  }
  .context-visual img{
    width:100%;height:100%;
    object-fit:cover;
    opacity:0.9;
    mix-blend-mode:luminosity;
  }
  .context-visual .caption-overlay{
    position:absolute;
    inset:0;
    display:flex;
    align-items:flex-end;
    padding:24px;
    background:linear-gradient(180deg, transparent 40%, rgba(5,11,24,0.9) 100%);
  }
  .context-visual .caption-overlay p{
    font-family:'Sora',sans-serif;
    font-weight:600;
    font-size:1.05rem;
    color:#fff;
    line-height:1.4;
  }

  /* ============ TEAM ============ */
  .team-panel{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
  }
  @media (max-width:800px){.team-panel{grid-template-columns:1fr;}}
  .team-card{
    background:var(--bg-card);
    border:1px solid var(--line);
    border-radius:16px;
    padding:32px;
  }
  .adviser-avatar{
    width:48px;height:48px;
    border-radius:50%;
    background:var(--grad);
    display:flex;
    align-items:center;
    justify-content:center;
    font-family:'Sora',sans-serif;
    font-weight:700;
    font-size:1rem;
    color:#fff;
    margin-bottom:18px;
  }
  .dev-avatar-row{
    display:flex;
    margin-bottom:18px;
  }
  .dev-avatar{
    width:40px;height:40px;
    border-radius:50%;
    background:var(--grad);
    border:2px solid var(--bg-card);
    display:flex;
    align-items:center;
    justify-content:center;
    font-family:'Sora',sans-serif;
    font-weight:700;
    font-size:0.78rem;
    color:#fff;
    margin-left:-10px;
  }
  .dev-avatar:first-child{margin-left:0;}
  .team-card .mono{color:var(--text-tertiary);margin-bottom:14px;display:block;}
  .team-card h3{font-size:1.15rem;margin-bottom:6px;font-weight:600;}
  .team-card .role{color:var(--blue);font-size:0.85rem;margin-bottom:16px;}
  .team-card p{color:var(--text-secondary);font-size:0.9rem;line-height:1.6;}
  .member-list{
    list-style:none;
    margin-top:16px;
    display:flex;
    flex-direction:column;
    gap:10px;
  }
  .member-list li{
    color:var(--text-secondary);
    font-size:0.92rem;
    padding:10px 0;
    border-top:1px solid var(--line);
  }
  .member-list li:first-child{border-top:none;}
  .placeholder-note{
    font-family:'JetBrains Mono',monospace;
    font-size:0.7rem;
    color:var(--text-tertiary);
    margin-top:16px;
  }

  /* ============ LIBRARY PREVIEW ============ */
  .library-strip{
    display:grid;
    grid-template-columns:repeat(5,1fr);
    gap:16px;
  }
  @media (max-width:800px){.library-strip{grid-template-columns:repeat(3,1fr);}}
  @media (max-width:500px){.library-strip{grid-template-columns:repeat(2,1fr);}}
  .lib-card{
    background:var(--bg-card);
    border:1px solid var(--line);
    border-radius:14px;
    padding:18px;
    text-align:center;
    transition:border-color 0.25s, transform 0.25s;
  }
  .lib-card:hover{border-color:rgba(139,92,246,0.4);transform:translateY(-3px);}
  .lib-card .lib-img-wrap{
    position:relative;
    width:100%;
    aspect-ratio:1/1;
    border-radius:8px;
    margin-bottom:10px;
    overflow:hidden;
    background:
      radial-gradient(circle at 30% 30%, rgba(0,122,255,0.35), transparent 60%),
      radial-gradient(circle at 70% 70%, rgba(139,92,246,0.35), transparent 60%),
      var(--bg-elevated);
  }
  .lib-card img{
    width:100%;
    height:100%;
    object-fit:cover;
    mix-blend-mode:luminosity;
    opacity:0.92;
  }
  .lib-card span{
    font-family:'JetBrains Mono',monospace;
    font-size:0.72rem;
    color:var(--text-secondary);
    text-transform:uppercase;
  }

  /* ============ LIVE DEMO ============ */
  .demo-panel{
    background:var(--bg-card);
    border:1px solid var(--line);
    border-radius:20px;
    padding:40px;
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:40px;
  }
  @media (max-width:860px){.demo-panel{grid-template-columns:1fr;padding:28px 22px;}}

  .demo-stage{
    position:relative;
    aspect-ratio:4/3;
    background:var(--bg-elevated);
    border:1px solid var(--line);
    border-radius:14px;
    overflow:hidden;
    display:flex;
    align-items:center;
    justify-content:center;
  }
  .demo-stage video, .demo-stage canvas, .demo-stage img{
    position:absolute;
    inset:0;
    width:100%;
    height:100%;
    object-fit:cover;
  }
  .demo-stage #demoOverlay{object-fit:contain;}
  .demo-placeholder{
    color:var(--text-tertiary);
    font-size:0.85rem;
    text-align:center;
    padding:0 20px;
    z-index:2;
  }

  .demo-controls{
    display:flex;
    gap:12px;
    margin-top:18px;
    flex-wrap:wrap;
  }
  .demo-btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:11px 20px;
    border-radius:9px;
    font-size:0.85rem;
    font-weight:600;
    cursor:pointer;
    border:1px solid var(--line);
    background:var(--bg-elevated);
    color:var(--text-primary);
    transition:border-color 0.2s;
    font-family:'Inter',sans-serif;
  }
  .demo-btn:hover{border-color:var(--blue);}
  .demo-btn.primary{
    background:var(--grad);
    border:none;
    color:#fff;
  }
  .demo-btn:disabled{opacity:0.5;cursor:not-allowed;}

  .demo-status{
    display:flex;
    align-items:center;
    gap:8px;
    margin-top:16px;
    font-family:'JetBrains Mono',monospace;
    font-size:0.75rem;
    color:var(--text-tertiary);
  }
  .status-dot{
    width:7px;height:7px;border-radius:50%;
    background:var(--text-tertiary);
  }
  .status-dot.live{background:var(--green);box-shadow:0 0 8px var(--green);}
  .status-dot.loading{background:var(--gold);}

  .result-card{
    background:var(--bg-elevated);
    border:1px solid var(--line);
    border-radius:14px;
    padding:28px;
    margin-top:20px;
  }
  .result-label{
    font-family:'JetBrains Mono',monospace;
    font-size:0.7rem;
    color:var(--text-tertiary);
    text-transform:uppercase;
    margin-bottom:10px;
    display:block;
  }
  .result-sign{
    font-family:'Sora',sans-serif;
    font-size:1.8rem;
    font-weight:700;
    margin-bottom:6px;
  }
  .result-meta{
    display:flex;
    gap:16px;
    color:var(--text-secondary);
    font-size:0.85rem;
  }
  .confidence-bar{
    height:6px;
    background:var(--bg-card);
    border-radius:4px;
    margin-top:14px;
    overflow:hidden;
  }
  .confidence-fill{
    height:100%;
    background:var(--grad);
    width:0%;
    transition:width 0.3s ease;
  }
  #fileInput{display:none;}

  /* ============ FOOTER ============ */
  footer{
    padding:64px 0 40px;
    border-top:1px solid var(--line);
  }
  .footer-inner{
    display:flex;
    justify-content:space-between;
    align-items:center;
    flex-wrap:wrap;
    gap:20px;
  }
  .footer-brand{
    display:flex;
    align-items:center;
    gap:10px;
    font-weight:700;
  }
  .footer-brand .dot{
    width:8px;height:8px;border-radius:50%;
    background:var(--grad);
  }
  footer .meta{
    color:var(--text-tertiary);
    font-size:0.82rem;
    text-align:right;
    line-height:1.6;
  }

  .reveal{
    opacity:0;
    transform:translateY(24px);
    transition:opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.visible{
    opacity:1;
    transform:translateY(0);
  }

  @media (prefers-reduced-motion: reduce){
    *{animation:none !important; transition:none !important;}
  }


  /* ============ NAV: mobile menu + CTA ============ */
  .nav-cta{
    color:var(--text-primary) !important;
    background:var(--grad);
    padding:7px 16px;
    border-radius:999px;
    font-weight:600;
  }
  .nav-toggle{
    display:none;
    background:none;border:0;cursor:pointer;
    width:40px;height:40px;
    flex-direction:column;justify-content:center;align-items:center;gap:5px;
  }
  .nav-toggle span{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:2px;transition:transform .25s, opacity .25s;}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
  @media (max-width:720px){
    .nav-toggle{display:flex;}
    .nav-links{
      display:none;
      position:absolute;top:100%;left:0;right:0;
      flex-direction:column;gap:0;
      background:rgba(5,11,24,0.97);
      border-bottom:1px solid var(--line);
      padding:8px 32px 20px;
    }
    .nav-links.open{display:flex;}
    .nav-links a{padding:14px 0;border-bottom:1px solid var(--line);}
    .nav-links .nav-cta{margin-top:14px;text-align:center;border-bottom:0;padding:12px 16px;}
  }

  /* ============ DOWNLOAD ============ */
  .download-panel{
    background:var(--bg-card);
    border:1px solid var(--line);
    border-radius:18px;
    padding:36px;
    max-width:760px;
    margin:0 auto;
  }
  .download-main{
    display:flex;align-items:center;gap:20px;flex-wrap:wrap;
    padding-bottom:28px;border-bottom:1px solid var(--line);
  }
  .download-main > div{flex:1;min-width:180px;}
  .download-logo{width:64px;height:64px;border-radius:16px;object-fit:cover;}
  .download-main h3{font-size:1.2rem;margin-bottom:6px;}
  .dl-meta{color:var(--text-tertiary);}
  .install-steps{
    margin:28px 0 20px 20px;
    color:var(--text-secondary);
    font-size:0.92rem;line-height:1.9;
  }
  .install-steps strong{color:var(--text-primary);font-weight:600;}
  .download-note{color:var(--text-tertiary);font-size:0.8rem;}
  footer .meta a{color:var(--text-secondary);}
  @media (max-width:600px){.download-panel{padding:24px 20px;}}