:root{
  --max-width: 1200px;
  --container-pad: 1rem;
  --accent: #2563eb;
  --muted: #6b7280;
  --bg: #ffffff;
  --radius: 12px;
  --transition: 200ms ease;
  --font-sans: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  --base-font-size: 16px;
}

*{box-sizing:border-box}
html{font-size:16px; -webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  color:#111827;
  background:var(--bg);
  line-height:1.45;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* Container */
.container{
  width:100%;
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 var(--container-pad);
}

/* Responsive grid helpers */
.row{display:flex;flex-wrap:wrap;margin:0 -0.5rem}
.col{padding:0 0.5rem;flex:1 1 0%}

/* Images */
img{max-width:100%;height:auto;display:block}

/* Buttons - touch friendly */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:.68rem 1rem;border-radius:8px;border:0;
  font-weight:600;cursor:pointer;min-height:44px;
  transition:transform var(--transition), box-shadow var(--transition);
}
.btn:active{transform:translateY(1px)}

/* NAV - mobile-first */
.site-header{
  position:sticky;top:0;z-index:60;background:rgba(255,255,255,0.97);backdrop-filter:saturate(120%) blur(6px);
  box-shadow:0 1px 0 rgba(16,24,40,0.04);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.6rem var(--container-pad)}
.brand{display:flex;align-items:center;gap:.6rem}
.brand img{height:36px;width:auto}

/* mobile hamburger */
.menu-toggle{
  display:flex;align-items:center;justify-content:center;
  width:44px;height:44px;border-radius:8px;border:0;background:transparent;
}
.nav{display:none;flex-direction:column;gap:.25rem;padding:0.6rem}
.nav a{padding:.6rem .4rem;border-radius:6px;text-decoration:none;color:inherit}
.nav a:hover{background:rgba(37,99,235,0.06);color:var(--accent)}

/* Desktop nav */
@media(min-width:880px){
  .menu-toggle{display:none}
  .nav{display:flex;flex-direction:row;gap:1rem;align-items:center;padding:0}
}

/* Hero example */
.hero{display:flex;flex-direction:column;align-items:flex-start;gap:1rem;padding:2.5rem 0}
.hero h1{font-size:clamp(1.6rem, 4vw, 2.6rem);margin:0;line-height:1.05}
.hero p{color:var(--muted);max-width:60ch}

/* Utility spacing */
.mt-1{margin-top:.5rem}
.mt-2{margin-top:1rem}
.mb-2{margin-bottom:1rem}
.p-2{padding:.75rem}

/* Smooth scroll behavior */
html{scroll-behavior:smooth}