:root{
    --graphite-950:#0a0b0d;
    --graphite-900:#111318;
    --graphite-850:#161920;
    --graphite-800:#1d212a;
    --line:#2a2e38;
    --line-soft:#20232b;
    --white:#f5f5f3;
    --gray-300:#c7cad1;
    --gray-500:#8a8f9c;
    --gray-600:#6b7080;
    --mustard:#c9a227;
    --mustard-bright:#e3c25a;
    --mustard-dim:#8a7020;
    --nav-bg-scrolled:rgba(10,11,13,.85);
    --on-accent:#14171b;
    --radius:2px;
  }
  :root[data-theme="light"]{
    --graphite-950:#ffffff;
    --graphite-900:#f4f4f1;
    --graphite-850:#ececE8;
    --graphite-800:#e3e3de;
    --line:#dcdcd6;
    --line-soft:#e9e9e5;
    --white:#14171b;
    --gray-300:#40444d;
    --gray-500:#666b76;
    --gray-600:#868c98;
    --mustard-dim:#b8901f;
    --nav-bg-scrolled:rgba(255,255,255,.88);
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--graphite-950);
    color:var(--white);
    font-family:'IBM Plex Sans',sans-serif;
    font-size:16px;
    line-height:1.65;
    overflow-x:hidden;
    transition:background .35s ease, color .35s ease;
  }
  h1,h2,h3,.display{font-family:'Space Grotesk',sans-serif;letter-spacing:-0.01em;}
  .mono{font-family:'IBM Plex Mono',monospace;}
  a{color:inherit;text-decoration:none;}
  .wrap{max-width:1180px;margin:0 auto;padding:0 40px;}
  .eyebrow{
    font-family:'IBM Plex Mono',monospace;
    font-size:11px;
    letter-spacing:0.16em;
    text-transform:uppercase;
    color:var(--mustard);
    display:flex;align-items:center;gap:10px;
    margin-bottom:20px;
  }
  .eyebrow::before{content:'';width:16px;height:1px;background:var(--mustard);}

  /* grid backdrop */
  .grid-bg{
    position:absolute;inset:0;
    background-image:
      linear-gradient(var(--line-soft) 1px, transparent 1px),
      linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
    background-size:64px 64px;
    -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,.9), rgba(0,0,0,0));
    mask-image:linear-gradient(180deg, rgba(0,0,0,.9), rgba(0,0,0,0));
    pointer-events:none;
  }
  .corner-tick{position:absolute;width:10px;height:10px;border:1px solid var(--mustard-dim);opacity:.6;}
  .corner-tick.tl{top:24px;left:24px;border-right:none;border-bottom:none;}
  .corner-tick.tr{top:24px;right:24px;border-left:none;border-bottom:none;}

  /* TOP BAR */
  .top-bar{
    position:fixed;top:0;left:0;right:0;z-index:110;
    background:var(--graphite-900);border-bottom:1px solid var(--line);
    height:36px;display:flex;align-items:center;
    font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--gray-500);
  }
  .top-bar-inner{display:flex;justify-content:flex-end;gap:22px;width:100%;}
  .top-bar a{color:var(--gray-500);display:flex;align-items:center;gap:6px;transition:color .2s;}
  .top-bar a:hover{color:var(--mustard-bright);}
  @media (max-width:640px){.top-bar-inner{justify-content:center;gap:16px;}}

  /* NAV */
  nav{
    position:fixed;top:36px;left:0;right:0;z-index:100;
    padding:22px 40px;
    display:flex;align-items:center;justify-content:space-between;
    transition:background .3s ease, border-color .3s ease, padding .3s ease;
    border-bottom:1px solid transparent;
  }
  nav.scrolled{
    background:var(--nav-bg-scrolled);
    -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
    padding:14px 40px;
  }
  .logo{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:18px;letter-spacing:-0.02em;}
  .logo span{color:var(--mustard);}
  .nav-links{display:flex;gap:36px;font-size:14px;color:var(--gray-300);}
  .nav-links a{transition:color .2s;position:relative;}
  .nav-links a:hover{color:var(--white);}
  .nav-cta{
    font-size:13px;font-family:'IBM Plex Mono',monospace;
    border:1px solid var(--mustard-dim);color:var(--mustard-bright);
    padding:9px 18px;transition:all .2s;white-space:nowrap;
  }
  .nav-cta:hover{background:var(--mustard);color:var(--on-accent);border-color:var(--mustard);}

  .theme-toggle{
    width:38px;height:38px;flex-shrink:0;display:flex;align-items:center;justify-content:center;
    border:1px solid var(--line);background:transparent;color:var(--gray-300);cursor:pointer;
    transition:all .2s ease;
  }
  .theme-toggle:hover{border-color:var(--mustard-dim);color:var(--mustard-bright);}
  .theme-toggle svg{width:17px;height:17px;}
  .theme-toggle .icon-moon{display:none;}
  :root[data-theme="light"] .theme-toggle .icon-sun{display:none;}
  :root[data-theme="light"] .theme-toggle .icon-moon{display:block;}
  .nav-mobile-hide{display:flex;}
  .nav-right{display:flex;align-items:center;gap:26px;}
  .btn-primary,.btn-ghost{
    font-size:14px;font-weight:500;padding:15px 26px;display:inline-flex;align-items:center;gap:10px;
    transition:all .2s ease;
  }
  .btn-primary{background:var(--mustard);color:var(--on-accent);}
  .btn-primary:hover{background:var(--mustard-bright);transform:translateY(-1px);}
  .btn-ghost{border:1px solid var(--line);color:var(--white);}
  .btn-ghost:hover{border-color:var(--gray-500);}
  /* FOOTER */
  footer{border-top:1px solid var(--line);padding:56px 0 34px;}
  .footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:50px;}
  @media (max-width:760px){.footer-top{grid-template-columns:1fr 1fr;}}
  .footer-top h4{font-size:12px;color:var(--gray-600);text-transform:uppercase;letter-spacing:.1em;margin-bottom:16px;font-family:'IBM Plex Mono',monospace;}
  .footer-top a,.footer-top p{display:block;font-size:14px;color:var(--gray-300);margin-bottom:10px;}
  .footer-top a:hover{color:var(--mustard-bright);}
  .footer-bottom{display:flex;justify-content:space-between;font-size:12px;color:var(--gray-600);border-top:1px solid var(--line);padding-top:26px;flex-wrap:wrap;gap:12px;font-family:'IBM Plex Mono',monospace;}