:root{
  --bg:#0e1117;
  --surface:#0f172a;
  --panel:#111827;
  --muted:#1f2937;
  --text:#e5e7eb;
  --subtle:#94a3b8;
  --primary:#10b981;
  --accent:#3b82f6;
  --ring: rgba(59,130,246,.5);
  --shadow: 0 12px 32px rgba(0,0,0,.35);
  --radius: 16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:radial-gradient(1200px 600px at 10% 10%, rgba(16,185,129,.08), transparent 40%), linear-gradient(180deg,var(--bg),#0b1020);color:var(--text);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.container{width:min(1100px,92%);margin-inline:auto}
.hidden{display:none}
.tag{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:#d1fae5;background:rgba(16,185,129,.15);border:1px solid rgba(16,185,129,.35);padding:4px 10px;border-radius:999px}

/* Header */
header.site-header{
  position:sticky;top:0;z-index:1000;background:rgba(17,24,39,.75);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.06)
}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:36px;height:36px}
.brand .title{font-weight:700;letter-spacing:.3px}

.nav{display:flex;align-items:center;gap:18px}
.nav a{color:var(--text);padding:8px 10px;border-radius:10px}
.nav a:hover{background:rgba(255,255,255,.06)}
.nav .dropdown{position:relative}
.nav .dropdown > button{
  background:transparent;border:0;color:var(--text);font:inherit;cursor:pointer;padding:8px 10px;border-radius:10px;display:flex;align-items:center;gap:6px
}
.chev{width:16px;height:16px;transform:rotate(0);transition:transform .2s ease}
.nav .dropdown:hover .chev{transform:rotate(180deg)}
.menu{position:absolute;top:110%;left:0;background:var(--panel);border:1px solid rgba(255,255,255,.06);
  border-radius:12px;box-shadow:var(--shadow);min-width:260px;opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:all .18s ease;overflow:hidden}
.nav .dropdown:hover .menu{opacity:1;visibility:visible;transform:translateY(0)}
.menu a{display:flex;justify-content:space-between;padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.05)}
.menu a:last-child{border-bottom:0}
.menu small{color:var(--subtle)}

.hamburger{display:none;background:transparent;border:0;color:var(--text);padding:6px}
.mobile-nav{display:none;}

/* Hero & cards */
.hero{padding:44px 0 10px}
.hero .banner{
  display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center;
  padding:26px;border-radius:var(--radius);
  background:linear-gradient(135deg, rgba(16,185,129,.18), rgba(59,130,246,.12));
  border:1px solid rgba(255,255,255,.08);
}
.hero h1{font-size:clamp(28px,4vw,40px);margin:0 0 12px}
.hero p{color:var(--subtle);margin:0}
.hero .cta{display:flex;gap:12px;margin-top:14px}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:10px 14px;
  background:linear-gradient(135deg,var(--accent),var(--primary));
  color:white;border-radius:12px;border:0;cursor:pointer;box-shadow:var(--shadow);font-weight:600
}
.btn.secondary{background:transparent;border:1px solid rgba(255,255,255,.14);color:var(--text)}

.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px;margin:24px 0}
.card{grid-column:span 6;padding:18px;border-radius:16px;background:rgba(17,24,39,.75);border:1px solid rgba(255,255,255,.08);transition:transform .18s ease, border-color .18s ease}
.card:hover{transform:translateY(-3px);border-color:rgba(59,130,246,.5)}
.card h3{margin:4px 0 8px}
.card p{margin:0;color:var(--subtle)}
.card .actions{margin-top:12px}
.badge{font-size:12px;padding:3px 8px;border-radius:999px;background:rgba(16,185,129,.18);color:#d1fae5;border:1px solid rgba(16,185,129,.35)}

.section-title{font-size:22px;margin:24px 0 8px}

/* Footer */
footer{margin-top:40px;border-top:1px solid rgba(255,255,255,.08);background:rgba(17,24,39,.6)}
footer .foot{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between;padding:16px 0;color:var(--subtle)}
footer .links{display:flex;gap:14px;flex-wrap:wrap}

/* Page layout */
.page{padding:14px 0 24px}
.page .back{display:inline-block;margin:12px 0 10px}
.page .back a{color:var(--accent);text-decoration:none}
.page .back a:hover{text-decoration:underline}

.form{display:grid;gap:12px;max-width:640px}
.input, textarea{width:100%;padding:12px 14px;border-radius:12px;background:var(--muted);border:1px solid rgba(255,255,255,.08);color:var(--text);outline:none}
.input:focus, textarea:focus{border-color:var(--ring);box-shadow:0 0 0 4px rgba(59,130,246,.15)}
textarea{min-height:140px;resize:vertical}
label{font-weight:600}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:12px}

table{width:100%;border-collapse:collapse;margin-top:12px}
th,td{border:1px solid rgba(255,255,255,.08);padding:8px;text-align:right}
th:first-child,td:first-child{text-align:left}
.calc-box{padding:16px;border-radius:16px;background:rgba(17,24,39,.7);border:1px solid rgba(255,255,255,.08);box-shadow:var(--shadow)}
.calc-box h1{margin:0 0 6px}
.calc-box p{color:var(--subtle)}

/* Notices */
.notice{padding:10px;border-radius:10px;background:rgba(59,130,246,.12);border:1px solid rgba(59,130,246,.28);color:#cde3ff}

/* Cookies */
.cookie-banner{
  position:fixed;left:12px;right:12px;bottom:12px;
  background:rgba(17,24,39,.95);border:1px solid rgba(255,255,255,.08);
  border-radius:14px;display:flex;gap:12px;align-items:center;justify-content:space-between;
  padding:12px;z-index:2000;box-shadow:var(--shadow)
}

/* Blog */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.post-card{border:1px solid rgba(255,255,255,.08);border-radius:16px;overflow:hidden;background:rgba(17,24,39,.7);display:block}
.post-card img{aspect-ratio:16/9;object-fit:cover;width:100%}
.post-card .pad{padding:12px}
.post-card h4{margin:0 0 6px}
.post-card p{margin:0;color:var(--subtle)}
article.prose h1, article.prose h2{margin-top:10px}

/* Mobile */
@media (max-width: 900px){
  .hero .banner{grid-template-columns:1fr}
  .card{grid-column:span 12}
  .blog-grid{grid-template-columns:1fr 1fr}
}
@media (max-width: 640px){
  .nav{display:none}
  .hamburger{display:block}
  .mobile-nav{display:block;border-top:1px solid rgba(255,255,255,.08);padding-bottom:12px}
  .mobile-nav .item{display:block;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.06)}
  .mobile-nav .group{margin-top:10px;border:1px solid rgba(255,255,255,.08);border-radius:12px;overflow:hidden}
  .mobile-nav .group .label{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:rgba(255,255,255,.04);cursor:pointer}
  .mobile-nav .group .content{display:none;padding:8px 12px}
  .mobile-nav .group.open .content{display:block}
}

/* === Blog grid & cards === */
.post-grid { display:grid; gap:18px; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); margin:20px 0; }
.post-card { background:#0f2033; border:1px solid #2b4766; border-radius:16px; padding:14px; }
.post-card .thumb img { width:100%; height:auto; display:block; border-radius:12px; }
.post-card h2 { margin:12px 0 6px; font-size:1.1rem; }
.post-card p { opacity:.85; }

/* === Post hero === */
.post-hero { margin:16px 0 24px; }
.post-hero img { width:100%; height:auto; display:block; border-radius:16px; border:1px solid #1f3b57; }
.post-hero figcaption { font-size:.9rem; opacity:.7; margin-top:8px; }

/* Kill stray hamburger/mobile if any CSS tries to show them */
.hamburger, #hamburger, #mobileNav { display:none !important; }

/* Table of contents */
.toc { background:#0f2033; border:1px solid #2b4766; border-radius:12px; padding:12px 14px; margin:16px 0; }
.toc ol { margin:8px 0 0 18px; }



  .nav { display:none; width:100%; padding:12px 0; }
  .nav.open { display:flex; flex-direction:column; align-items:flex-start; }
  .nav .dropdown > .menu { position:static; width:100%; margin-top:6px; }
}


/* Sticky footer */
.site-footer { position: fixed; left: 0; right: 0; bottom: 0; z-index: 998; background: #0b1b2a; border-top: 1px solid #2b4766; }
.site-footer .container { padding: 10px 16px; }
:root { --footer-height: 56px; }
body { padding-bottom: calc(var(--footer-height) + 12px); }



  .nav { gap:10px; }
  .nav .dropdown > .menu { position:static; width:100%; margin-top:6px; }
}


  .nav .dropdown > .menu { position:static; width:100%; margin-top:6px; }
}



@media (max-width: 768px){
  .footer-inner { flex-direction:column; align-items:flex-start; gap:8px; }
}

/* Footer layout & sticky behavior */
.site-footer { position: fixed; left: 0; right: 0; bottom: 0; z-index: 998; background: #0b1b2a; border-top: 1px solid #2b4766; }
.site-footer .footer-inner { display:flex; gap:10px; align-items:center; justify-content:space-between; padding:10px 16px; flex-wrap:wrap; }
.footer-nav a { color:#cfe8ff; text-decoration:none; margin-right:16px; }
.footer-nav a:hover { text-decoration:underline; }
:root { --footer-height: 56px; }
body { padding-bottom: calc(var(--footer-height) + 12px); }
@media (max-width: 768px){
  .footer-inner { flex-direction:column; align-items:flex-start; gap:8px; }
}



  header .topbar { flex-wrap:wrap; }
  .nav { display:none; width:100%; padding:10px 0; }
  .nav.open { display:flex; flex-direction:column; align-items:flex-start; gap:10px; }
  .nav .dropdown > .menu { position:static; width:100%; margin-top:6px; }
}



.site-header { position: sticky; top:0; z-index: 999; background:#0b1b2a; border-bottom:1px solid #2b4766; }
.topbar { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:10px 16px; }
.brand { display:flex; align-items:center; gap:8px; color:#e6f2ff; text-decoration:none; font-weight:700; }
.brand span { font-size:1.05rem; letter-spacing:.3px; }
.nav { display:flex; align-items:center; gap:16px; }
.nav a { color:#cfe8ff; text-decoration:none; padding:6px 8px; border-radius:8px; }
.nav a:hover, .nav a:focus-visible { background:#142436; outline:none; }
.dropdown { position:relative; }
.dropbtn { background:#162435; color:#e6f2ff; border:1px solid #2b4766; padding:8px 10px; border-radius:10px; cursor:pointer; display:inline-flex; align-items:center; gap:6px; }
.dropdown .menu { position:absolute; top:120%; left:0; min-width:260px; background:#0f2033; border:1px solid #2b4766; border-radius:12px; padding:8px; display:none; }
.dropdown.open .menu { display:block; }
.dropdown .menu a { display:block; padding:8px 10px; border-radius:8px; color:#cfe8ff; }
.dropdown .menu a:hover { background:#152a43; }
.nav-toggle { display:none; margin-left:auto; background:#162435; color:#e6f2ff; border:1px solid #2b4766; padding:8px 12px; border-radius:10px; cursor:pointer; }

@media (max-width: 900px){
  .nav-toggle { display:inline-flex; }
  .nav { display:none; position:static; width:100%; padding:10px 16px; flex-direction:column; align-items:flex-start; gap:10px; }
  .nav.open { display:flex; }
  .dropdown .menu { position:static; width:100%; margin-top:6px; }
}
/* Keyboard focus */
a:focus-visible, button:focus-visible { outline: 2px solid #66b3ff; outline-offset:2px; border-radius:8px; }



.site-header { position: sticky; top:0; z-index: 999; background:#0b1b2a; border-bottom:1px solid #2b4766; }
.topbar { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:10px 16px; }
.brand { display:flex; align-items:center; gap:8px; color:#e6f2ff; text-decoration:none; font-weight:700; }
.brand span { font-size:1.05rem; letter-spacing:.3px; }

/* Base nav */
.nav { display:flex; align-items:center; gap:16px; }
.nav a { color:#cfe8ff; text-decoration:none; padding:6px 8px; border-radius:8px; }
.nav a:hover, .nav a:focus-visible { background:#142436; outline:none; }

/* Tools dropdown using <details> */
.dropdown { position:relative; }
.dropdown > summary { list-style:none; cursor:pointer; background:#162435; color:#e6f2ff; border:1px solid #2b4766; padding:8px 10px; border-radius:10px; }
.dropdown > summary::-webkit-details-marker { display:none; }
.dropdown .menu { position:absolute; top:120%; left:0; min-width:260px; background:#0f2033; border:1px solid #2b4766; border-radius:12px; padding:8px; display:none; }
.dropdown[open] .menu { display:block; }
.dropdown .menu a { display:block; padding:8px 10px; border-radius:8px; color:#cfe8ff; }
.dropdown .menu a:hover { background:#152a43; }

/* Mobile wrapper using <details> */
.nav-wrap { position:relative; }
.nav-toggle { display:none; margin-left:auto; background:#162435; color:#e6f2ff; border:1px solid #2b4766; padding:8px 12px; border-radius:10px; cursor:pointer; }
.nav-toggle::-webkit-details-marker { display:none; }

@media (max-width: 900px){
  .nav-toggle { display:inline-flex; align-items:center; }
  .nav { display:none; position:static; width:100%; padding:10px 0; flex-direction:column; align-items:flex-start; gap:10px; }
  .nav-wrap[open] .nav { display:flex; }
  .dropdown .menu { position:static; width:100%; margin-top:6px; display:none; }
  .dropdown[open] .menu { display:block; }
}

/* Focus outline */
a:focus-visible, summary:focus-visible { outline: 2px solid #66b3ff; outline-offset:2px; border-radius:8px; }



.site-header { position: sticky; top:0; z-index: 999; background:#0b1b2a; border-bottom:1px solid #2b4766; }
.topbar { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:10px 16px; }
.brand { display:flex; align-items:center; gap:8px; color:#e6f2ff; text-decoration:none; font-weight:700; }
.brand span { font-size:1.05rem; letter-spacing:.3px; }

/* Desktop nav */
.nav { display:block; }
.nav-list { display:flex; align-items:center; gap:16px; margin:0; padding:0; list-style:none; }
.nav-list > li > a { color:#cfe8ff; text-decoration:none; padding:8px 10px; border-radius:8px; display:inline-block; }
.nav-list > li > a:hover, .nav-list > li > a:focus-visible { background:#142436; outline:none; }

/* Dropdown */
.dropdown { position:relative; }
.dropbtn { background:#162435; color:#e6f2ff; border:1px solid #2b4766; padding:8px 10px; border-radius:10px; cursor:pointer; display:inline-flex; align-items:center; gap:6px; }
.menu { position:absolute; top:120%; left:0; min-width:260px; background:#0f2033; border:1px solid #2b4766; border-radius:12px; padding:8px; display:none; z-index:1000; }
.dropdown.open .menu { display:block; }
.menu li { list-style:none; }
.menu a { display:block; padding:8px 10px; border-radius:8px; color:#cfe8ff; text-decoration:none; }
.menu a:hover { background:#152a43; }

/* Hamburger */
.nav-toggle { display:none; background:transparent; border:0; width:44px; height:44px; align-items:center; justify-content:center; cursor:pointer; }
.nav-toggle .line { display:block; width:24px; height:2px; background:#e6f2ff; margin:3px 0; border-radius:2px; }

/* Mobile layout */
@media (max-width: 900px){
  .nav-toggle { display:inline-flex; }
  .nav { display:none; width:100%; }
  .nav.open { display:block; }
  .nav-list { flex-direction:column; align-items:flex-start; gap:10px; padding:10px 0; }
  .dropdown .menu { position:static; width:100%; margin-top:6px; display:none; }
  .dropdown.open .menu { display:block; }
}

/* Focus outline */
a:focus-visible, button:focus-visible { outline: 2px solid #66b3ff; outline-offset:2px; border-radius:8px; }


/* === Modern Nav (desktop + mobile, off-canvas) === */
.site-header { position:sticky; top:0; z-index:999; background:#0b1b2a; border-bottom:1px solid #2b4766; }
.topbar { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:10px 16px; }
.brand { display:flex; align-items:center; gap:8px; color:#e6f2ff; text-decoration:none; font-weight:700; }
.brand span { font-size:1.05rem; letter-spacing:.3px; }

/* Desktop inline nav */
.main-nav { display:block; }
.nav-inline { display:flex; align-items:center; gap:16px; margin:0; padding:0; list-style:none; }
.nav-inline > li > a { color:#cfe8ff; text-decoration:none; padding:8px 10px; border-radius:8px; display:inline-block; }
.nav-inline > li > a:hover, .nav-inline > li > a:focus-visible { background:#142436; outline:none; }

/* Dropdown */
.has-dropdown { position:relative; }
.dropdown-toggle { background:#162435; color:#e6f2ff; border:1px solid #2b4766; padding:8px 10px; border-radius:10px; cursor:pointer; display:inline-flex; align-items:center; gap:6px; }
.dropdown-menu { position:absolute; top:120%; left:0; min-width:260px; background:#0f2033; border:1px solid #2b4766; border-radius:12px; padding:8px; display:none; z-index:1000; }
.has-dropdown.open .dropdown-menu { display:block; }
.dropdown-menu a { display:block; padding:8px 10px; border-radius:8px; color:#cfe8ff; text-decoration:none; }
.dropdown-menu a:hover { background:#152a43; }

/* Hamburger (mobile trigger) */
.hamburger { display:none; background:transparent; border:0; width:44px; height:44px; align-items:center; justify-content:center; cursor:pointer; }
.hamburger span { display:block; width:24px; height:2px; background:#e6f2ff; margin:3px 0; border-radius:2px; }

/* Backdrop for mobile nav */
.nav-backdrop { position:fixed; inset:0; background:rgba(0,0,0,.4); z-index:998; }

/* Mobile: off-canvas */
@media (max-width: 900px){
  .hamburger { display:inline-flex; }
  .main-nav { position:fixed; top:0; right:0; height:100dvh; width:82vw; max-width:360px; background:#0b1b2a; border-left:1px solid #2b4766; transform:translateX(100%); transition:transform .25s ease; padding:70px 16px 16px; z-index:999; }
  .main-nav.open { transform:translateX(0); }
  .nav-inline { flex-direction:column; align-items:flex-start; gap:12px; }
  .dropdown-menu { position:static; display:none; width:100%; margin-top:6px; }
  .has-dropdown.open .dropdown-menu { display:block; }
}

/* Keyboard focus */
a:focus-visible, button:focus-visible { outline:2px solid #66b3ff; outline-offset:2px; border-radius:8px; }


/* Back Home link styling */
.back-home { margin: 10px 0 14px; }
.back-home a { display:inline-block; padding:8px 12px; border-radius:10px; background:#162435; color:#cfe8ff; text-decoration:none; border:1px solid #2b4766; }
.back-home a:hover { background:#1c2d47; }

/* Sticky header & footer (ensure across pages) */
.site-footer { position: fixed; left:0; right:0; bottom:0; z-index:998; background:#0b1b2a; border-top:1px solid #2b4766; }
:root { --footer-height: 56px; }
body { padding-bottom: calc(var(--footer-height) + 12px); }
/* Header already sticky via .fd-header; if not present, make .site-header sticky */
.site-header { position: sticky; top: 0; z-index: 999; }