:root{
  --bg:#ffffff;--text:#0f172a;--muted:#334155;--accent:#0ea5e9;--accent2:#2563eb;--card:#ffffff;--border:#e5e7eb;
  --logo-size:70px;          /* logo size */
  --header-py:0px;           /* tighter header */
  --header-py-compact:0px;   /* tighter when sticky */
  --menu-py:4px;             /* slimmer nav pills */
}
*{box-sizing:border-box} html,body{margin:0}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,'Noto Sans';background:var(--bg);color:var(--text)}
a{color:var(--accent2);text-decoration:none}

/* Header (sticky + blur) */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.85);
  -webkit-backdrop-filter:saturate(180%) blur(8px);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--border);
  transition:box-shadow .2s ease,background-color .2s ease,transform .2s ease;
}
.site-header .nav{padding:var(--header-py) 16px}
.site-header.is-sticky{box-shadow:0 10px 30px rgba(15,23,42,.08)}
.site-header.is-compact .nav{padding:var(--header-py-compact) 16px}

/* Layout */
.nav{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  max-width:1100px;margin:0 auto;position:relative;
  min-height:var(--logo-size);        /* header height hugs logo */
}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.hero{max-width:1100px;margin:24px auto;border:1px solid var(--border);border-radius:16px;overflow:hidden}
section{padding:26px 0} h1,h2{margin:.2rem 0} .lede{color:var(--muted)}
.btn{display:inline-flex;gap:10px;align-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border:none;padding:12px 16px;font-weight:700;border-radius:12px;cursor:pointer}
footer{border-top:1px solid var(--border);color:var(--muted);padding:24px 20px;margin-top:36px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:22px;box-shadow:0 4px 18px rgba(15,23,42,.05)}

/* Brand (logo + text) */
.logo{display:inline-flex;align-items:center;gap:2px;text-decoration:none;color:#0f172a;font-weight:800;letter-spacing:.2px;line-height:0}
.logo:focus-visible{outline:2px solid #2563eb;outline-offset:2px}
.logo-mark{display:block;width:var(--logo-size);height:var(--logo-size);object-fit:contain;border-radius:8px}
.logo-text{white-space:nowrap;line-height:1}

/* Desktop menu */
.menu{display:flex;gap:16px;list-style:none;margin:0;padding:0}
.menu a{padding:var(--menu-py) 12px;border-radius:10px;color:var(--text);line-height:1}
.menu a:hover,.menu a.active{background:#eef6ff}

/* Toggle button (hidden on desktop by default) */
.menu-toggle{display:none;align-items:center;justify-content:center;gap:8px;border:1px solid #e5e7eb;background:#fff;border-radius:10px;padding:10px 12px;cursor:pointer}
.menu-toggle:focus-visible{outline:2px solid #2563eb;outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ================= MOBILE ================= */
@media (max-width:840px){
  .site-header{--logo-size:48px}      /* remove if you want full-size logo on phones */
  .menu-toggle{display:inline-flex}

  /* Fallback when JS is off: allow wrap */
  .nav .menu{flex-wrap:wrap}

  /* JS enhancement: dropdown panel right under header */
  .nav.js-enabled .menu{
    position:absolute; left:12px; right:12px; top:calc(100% + 8px);
    background:#fff; border:1px solid #e5e7eb; border-radius:12px;
    box-shadow:0 10px 30px rgba(15,23,42,.12);
    padding:10px; margin:0; display:block; flex-direction:column; gap:6px; z-index:1000;
    max-height:0; overflow:hidden; opacity:0; transform:translateY(-4px);
    transition:max-height .32s ease, opacity .2s ease, transform .2s ease;
  }
  .nav.js-enabled.open .menu{opacity:1; transform:translateY(0)}
  .menu a{display:block;padding:12px 14px}
}

/* ================= DESKTOP ENFORCEMENT ================= */
@media (min-width:841px){
  .menu-toggle{display:none !important}
  .nav .menu{
    display:flex !important;
    position:static !important;
    max-height:none !important;
    opacity:1 !important;
    transform:none !important;
  }
}

/* Optional: bigger logo on large screens
   (delete this block if you want header height identical on desktop) */
@media (min-width:1024px){
  .logo-mark{width:calc(var(--logo-size) + 20px);height:calc(var(--logo-size) + 20px)}
}