/* ============================================================
   ARXcelerate — shared base styles
   Design tokens, reset, layout helpers, nav, buttons, footer.
   Every page links this first, then adds its own page-specific CSS.
   ============================================================ */

:root{
  --ink:#13141A;
  --paper:#F8F7F3;
  --signal:#4C5FD6;
  --signal-deep:#3547B8;
  --signal-pale:#EAEBFA;
  --line:#E3E1DA;
  --muted:#5C5E66;
  --white:#FFFFFF;
  --font-serif:'Georgia','Times New Roman',serif;
  --font-sans:-apple-system,BlinkMacSystemFont,'Segoe UI','Helvetica Neue',Arial,sans-serif;
  --font-mono:'IBM Plex Mono',monospace;
  --maxw:1120px;
  --r-pill:999px;
  --r-lg:22px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font-sans);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:400;margin:0;color:var(--ink);}
h1 strong,h2 strong{font-weight:700;}
em{font-style:italic;color:var(--signal-deep);}
p{margin:0;color:var(--muted);line-height:1.62;font-size:0.98rem;}
a{color:inherit;text-decoration:none;}
label{display:block;}
button,input,select,textarea{
  font-family:inherit;font-size:inherit;color:inherit;
  -webkit-appearance:none;-moz-appearance:none;appearance:none;
  margin:0;box-shadow:none;
}
button{cursor:pointer;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
.label{
  font-family:var(--font-sans);font-size:0.7rem;font-weight:600;
  letter-spacing:0.14em;text-transform:uppercase;color:var(--signal-deep);
  display:block;
}

/* ---------- NAV ---------- */
header{
  position:sticky;top:0;z-index:100;
  background:rgba(248,247,243,0.86);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
nav{
  max-width:var(--maxw);margin:0 auto;padding:15px 28px;
  display:flex;align-items:center;justify-content:space-between;
}
.logo{font-family:var(--font-serif);font-weight:400;font-size:1.08rem;display:flex;align-items:center;gap:8px;}
.logo svg{width:17px;height:17px;flex:none;}
.nav-links{display:flex;gap:26px;align-items:center;}
.nav-links a{font-size:0.85rem;font-weight:500;color:var(--ink);opacity:0.72;transition:opacity .15s;}
.nav-links a:hover,.nav-links a.active{opacity:1;}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-sans);font-weight:600;font-size:0.85rem;
  padding:10px 18px;border-radius:var(--r-pill);
  transition:background .18s,transform .18s,border-color .18s;white-space:nowrap;
  border:1px solid transparent;line-height:1.4;cursor:pointer;
}
.btn:disabled{opacity:0.4;cursor:not-allowed;}
.btn-primary{background:var(--ink);color:var(--white);}
.btn-primary:hover:not(:disabled){background:var(--signal-deep);transform:translateY(-1px);}
.btn-outline{background:transparent;border-color:var(--ink);color:var(--ink);}
.btn-outline:hover:not(:disabled){background:var(--ink);color:var(--white);}

/* mobile menu toggle (hidden on desktop) */
.nav-toggle{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none;}
.nav-burger{display:none;}

@media (max-width:820px){
  .nav-burger{
    display:flex;flex-direction:column;justify-content:center;gap:5px;
    width:42px;height:42px;margin-left:auto;padding:0 10px;cursor:pointer;
    border:1px solid var(--line);border-radius:11px;background:var(--white);
  }
  .nav-burger span{
    height:2px;width:100%;background:var(--ink);border-radius:2px;
    transition:transform .2s ease, opacity .2s ease;
  }
  .nav-toggle:checked ~ .nav-burger span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .nav-toggle:checked ~ .nav-burger span:nth-child(2){opacity:0;}
  .nav-toggle:checked ~ .nav-burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

  .nav-links{
    display:none;
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:4px 28px 14px;
    box-shadow:0 14px 26px -14px rgba(19,20,26,0.22);
  }
  .nav-toggle:checked ~ .nav-links{display:flex;}
  .nav-links a{
    padding:14px 2px;font-size:0.95rem;opacity:0.9;
    border-top:1px solid var(--line);
  }
  .nav-links a:first-child{border-top:none;}
  /* header CTA collapses into the menu on mobile */
  nav > .btn-primary{display:none;}
}

/* ---------- FOOTER ---------- */
footer{padding:48px 0 32px;}
.footer-row{
  display:flex;justify-content:space-between;align-items:flex-start;gap:28px;flex-wrap:wrap;
  padding-bottom:30px;border-bottom:1px solid var(--line);
}
.footer-row p{max-width:280px;font-size:0.85rem;margin-top:10px;}
.footer-nav{display:flex;gap:44px;}
.footer-nav div{display:flex;flex-direction:column;gap:7px;}
.footer-nav h4{font-family:var(--font-sans);font-size:0.7rem;font-weight:600;letter-spacing:0.12em;text-transform:uppercase;color:var(--muted);margin:0 0 4px;}
.footer-nav a{font-size:0.85rem;}
.footer-nav a:hover{color:var(--signal-deep);}
.footer-bottom{display:flex;justify-content:space-between;padding-top:20px;font-size:0.8rem;color:var(--muted);flex-wrap:wrap;gap:8px;}