:root{
  --bg:#0b1220;
  --card:#0f172a;
  --ink:#e5edff;
  --muted:#c7d2fe;
  --accent:#6ea8fe;
  --accent2:#22c55e;
  --border:#1f2a44;
}

:root.light{
  --bg:#f8fafc;
  --card:#ffffff;
  --ink:#0f172a;
  --muted:#475569;
  --accent:#2563eb;
  --accent2:#16a34a;
  --border:#e2e8f0;
}

*{box-sizing:border-box}
html,body{font-family:'Inter','Roboto',system-ui,-apple-system,Segoe UI,Arial,sans-serif;margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink);
  background:var(--bg);line-height:1.75}
a{color:var(--accent);text-decoration:none;transition:all .2s ease}a:hover{opacity:.9;text-decoration:underline}
img{max-width:100%;display:block}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
.header{position:sticky;top:0;background:color-mix(in oklab, var(--bg), #000 10%);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:20}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.2px;color:var(--ink)}
.brand img{height:30px;filter:drop-shadow(0 2px 6px rgba(110,168,254,.35))}
.menu{display:flex;gap:18px;flex-wrap:wrap}
.menu a{padding:8px 10px;border-radius:10px;color:var(--ink)}
.menu a.active{background:linear-gradient(135deg, rgba(110,168,254,.18), rgba(34,197,94,.18));border:1px solid rgba(110,168,254,.35)}
.theme-toggle{border:1px solid var(--border);background:transparent;color:var(--ink);padding:8px 12px;border-radius:10px;cursor:pointer}
.theme-toggle:hover{background:rgba(255,255,255,.06)}
.hero{padding:72px 0 32px}
.badge{display:inline-block;padding:6px 12px;border:1px solid rgba(110,168,254,.35);border-radius:999px;font-size:12px;color:var(--ink);background:rgba(110,168,254,.12)}
h1{font-size:clamp(28px,4vw,44px);margin:.4em 0 .2em;font-weight:900;letter-spacing:-.4px}
.lead{color:var(--muted);max-width:820px}
.grid{display:grid;gap:22px;margin-top:26px}
@media(min-width:980px){.grid{grid-template-columns:2fr 1fr}}
.card, article{border:1px solid var(--border);border-radius:16px;padding:22px;background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,.01));box-shadow:0 10px 30px rgba(0,0,0,.25)}
.card h3, article h2{margin:0 0 10px 0}
.section{margin:44px 0}
.list{list-style:disc;padding-left:20px}
.footer{border-top:1px solid var(--border);margin-top:44px}
.footer .container{padding:24px 20px;color:var(--muted);font-size:14px}
.btn{display:inline-block;padding:12px 16px;border-radius:12px;background:linear-gradient(135deg, var(--accent), #4f8df6);color:#081022;border:1px solid rgba(110,168,254,.6);font-weight:700;transition:transform .08s ease}
.btn:hover{filter:brightness(1.08);text-decoration:none;transform:translateY(-1px)}
.cards{display:grid;gap:16px}
@media(min-width:760px){.cards{grid-template-columns:repeat(3,1fr)}}
.meta{color:var(--muted);font-size:14px;margin-bottom:6px}
.kicker{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.12em}
.figure{background:rgba(110,168,254,.06);border:1px dashed rgba(110,168,254,.35);border-radius:12px;padding:12px;text-align:center;color:var(--muted);font-size:13px}
.small{font-size:13px;color:var(--muted)}
.table{width:100%;border-collapse:collapse}
.table th,.table td{border:1px solid var(--border);padding:10px;text-align:left;vertical-align:top}
blockquote{border-left:4px solid rgba(110,168,254,.35);padding-left:12px;color:var(--ink);background:rgba(110,168,254,.06);border-radius:6px}
details{border:1px solid var(--border);border-radius:12px;padding:14px 16px;background:rgba(255,255,255,.03)}
details+details{margin-top:12px}
summary{cursor:pointer;font-weight:800;color:var(--ink)}
form{display:grid;gap:10px}
input,textarea{font:inherit;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:transparent;color:var(--ink)}
hr.divider{border:0;height:1px;background:linear-gradient(90deg, rgba(110,168,254,0), rgba(110,168,254,.5), rgba(110,168,254,0));margin:28px 0}

/* Back to top */
#topBtn{position:fixed;right:16px;bottom:16px;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:rgba(255,255,255,.06);color:var(--ink);cursor:pointer;display:none}
#cookie{position:fixed;left:16px;bottom:16px;max-width:520px;background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.03));border:1px solid var(--border);border-radius:12px;padding:14px;color:var(--ink);display:none}
#cookie button{margin-left:10px}


/* --- Mobile nav improvements --- */
.menu-toggle{display:none;border:1px solid var(--border);background:transparent;color:var(--ink);
  padding:8px 12px;border-radius:10px;cursor:pointer;margin-left:10px}
.menu-toggle:hover{background:rgba(255,255,255,.06)}
.brand{white-space:nowrap}

@media(max-width: 920px){
  .menu{display:none;position:absolute;top:100%;left:0;right:0;
    background:color-mix(in oklab, var(--bg), #000 8%);border-bottom:1px solid var(--border);
    padding:12px 20px;flex-direction:column;gap:12px}
  .menu.open{display:flex}
  .nav{position:relative}
  .theme-toggle{display:none}
  .hero{padding-top:56px}
}


/* --- Nav as flat buttons --- */
.menu a{
  display:inline-block;
  padding:8px 16px;
  border-radius:8px;
  background:rgba(255,255,255,0.06);
  border:1px solid var(--border);
  transition:background .2s ease, color .2s ease;
}
.menu a:hover{
  background:rgba(110,168,254,0.2);
  text-decoration:none;
}
.menu a.active{
  background:var(--accent);
  color:#081022;
  font-weight:700;
}


/* --- Header search --- */
.searchbar{display:flex;align-items:center;gap:8px;margin-left:10px}
.searchbar input{padding:8px 10px;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--ink);min-width:180px}
.search-results{position:absolute;top:100%;right:20px;max-width:420px;background:color-mix(in oklab, var(--bg), #000 10%);
  border:1px solid var(--border);border-radius:10px;padding:10px;display:none;z-index:50}
.search-results.open{display:block}
.search-results a{display:block;padding:6px 8px;border-radius:8px}
.search-results a:hover{background:rgba(255,255,255,.06);text-decoration:none}

/* Cookie banner better spacing */
#cookie{display:none;position:fixed;left:16px;right:16px;bottom:16px;max-width:720px;margin:auto;z-index:40}
#cookie .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
#cookie .close{border:1px solid var(--border);background:transparent;color:var(--ink);padding:8px 12px;border-radius:10px;cursor:pointer}
#cookie .close:hover{background:rgba(255,255,255,.06)}

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


/* Focus styles for accessibility */
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:8px}

/* Breadcrumbs */
.breadcrumbs{font-size:13px;color:var(--muted);margin-top:16px;margin-bottom:8px}
.breadcrumbs a{color:var(--accent)}

/* Print styles */
@media print{
  .header,#cookie,#topBtn,.theme-toggle,.menu,.searchbar,.btn-print{display:none !important}
  body{background:#fff;color:#000}
  article,.card{border:none;box-shadow:none}
  a{color:#000;text-decoration:underline}
}

/* Hero illustrations */
.hero-illus{display:block;margin:14px 0 0 0}

/* --- CLEAN THEME TWEAKS --- */
.menu a{
  display:inline-block;
  padding:8px 12px;
  border-radius:8px;
  background:transparent;
  border:1px solid transparent;
}
.menu a:hover{
  background:rgba(255,255,255,0.06);
  border-color:var(--border);
  text-decoration:none;
}
.menu a.active{
  background:rgba(110,168,254,0.18);
  color:var(--ink);
  border-color:rgba(110,168,254,0.5);
}
.lang{font-size:13px}
.lang a{color:var(--muted)}
.lang a:hover{color:var(--accent)}
/* Hide hero illustration blocks for a cleaner look */
.hero-illus{display:none !important}


/* --- NAV FIX: keep header single-line & tidy --- */
.header .nav{display:flex;align-items:center;gap:14px;flex-wrap:nowrap}
.brand{flex:0 0 auto;white-space:nowrap}
.menu{flex:1 1 auto;display:flex;justify-content:center;gap:14px;flex-wrap:nowrap;min-width:0}
.menu a{flex:0 0 auto;white-space:nowrap}
.searchbar{flex:0 0 auto}
.searchbar input{min-width:140px;max-width:220px}
.theme-toggle{flex:0 0 auto}
/* Avoid accidental second row */
.header{min-height:58px}
/* If still narrow, allow menu to scroll horizontally instead of wrapping */
@media(max-width: 1060px){
  .menu{overflow-x:auto;justify-content:flex-start}
}

/* --- Brand as Home icon --- */
.brand svg{height:28px;width:auto;display:block;fill:var(--ink);transition:opacity .2s ease, transform .06s ease}
.brand:hover svg{opacity:.9;transform:translateY(-1px)}


/* --- HEADER GRID FIX --- */
.header .nav{
  display:grid;
  grid-template-columns:auto 1fr auto auto;
  align-items:center;
  gap:12px;
}
.brand{white-space:nowrap}
.menu{
  display:flex;
  gap:12px;
  justify-content:center;
  flex-wrap:nowrap;
  overflow-x:auto;
  scrollbar-width:none;
}
.menu::-webkit-scrollbar{display:none}
.menu a{flex:0 0 auto;white-space:nowrap}
.searchbar{min-width:0}
.searchbar input{width:220px;max-width:28vw;min-width:140px}
/* Ensure menu doesn't slide under search on tight widths */
@media(max-width: 1120px){
  .searchbar input{max-width:22vw}
}
@media(max-width: 980px){
  .searchbar input{display:none}
}

.menu a{padding:6px 10px}


/* ===== Sidebar layout ===== */
.layout{display:grid;grid-template-columns:220px 1fr;gap:18px;align-items:start}
.sidebar{position:sticky;top:64px;height:calc(100vh - 64px);padding:8px 6px 16px 12px;border-right:1px solid var(--border)}
.sidebar a{display:block;padding:10px 12px;margin:4px 0;border-radius:10px;border:1px solid transparent;color:var(--ink)}
.sidebar a:hover{background:rgba(255,255,255,.06);text-decoration:none;border-color:var(--border)}
.sidebar a.active{background:rgba(110,168,254,.18);border-color:rgba(110,168,254,.5)}
/* Hide the old top menu */
.menu{display:none !important}
/* Make header compact since no menu in it */
.header .nav{grid-template-columns:auto 1fr auto;gap:12px}
/* Responsive: collapse sidebar to top dropdown on small screens */
@media(max-width: 980px){
  .layout{display:block}
  .sidebar{position:relative;top:auto;height:auto;border-right:none;border-bottom:1px solid var(--border);padding:8px 12px;margin:0 20px}
  .sidebar .toggle{display:inline-block;margin-bottom:8px}
  .sidebar .links{display:none}
  .sidebar.open .links{display:block}
  .sidebar .toggle button{border:1px solid var(--border);background:transparent;color:var(--ink);padding:8px 12px;border-radius:10px}
}


/* ====== Energy/Vibe upgrade ====== */

/* Smooth theme transition */
:root, :root.light {
  transition: background-color .25s ease, color .25s ease;
}

/* Airier vertical rhythm */
.hero{padding:84px 0 36px}
.section{margin:56px 0}

/* Card lift + hover */
.card, article{
  transition: transform .12s ease, box-shadow .2s ease, background .25s ease, border-color .25s ease;
}
.card:hover, article:hover{
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(0,0,0,.25);
}

/* Buttons */
.btn{
  transition: transform .06s ease, filter .2s ease, background .25s ease, color .25s ease, border-color .25s ease;
}
.btn:hover{ transform: translateY(-1px); }

/* Sidebar links vibe */
.sidebar a{
  position:relative;
  transition: background .2s ease, border-color .2s ease, color .2s ease, transform .06s ease;
}
.sidebar a:hover{ transform: translateX(2px); }
.sidebar a.active{
  background: linear-gradient(90deg, rgba(110,168,254,.18), rgba(110,168,254,.04));
  border-color: rgba(110,168,254,.5);
}

/* Links underline animation */
a{ text-decoration:none; background-image: linear-gradient(currentColor, currentColor);
    background-size: 0% 1px; background-repeat:no-repeat; background-position: 0 100%;
    transition: background-size .2s ease; }
a:hover{ background-size: 100% 1px; }
.menu a, .sidebar a{ background-image:none } /* keep buttons clean */

/* Search input focus */
.searchbar input{ transition: box-shadow .2s ease, border-color .2s ease }
.searchbar input:focus{ outline:none; border-color: rgba(110,168,254,.6); box-shadow: 0 0 0 4px rgba(110,168,254,.15) }

/* Cookie + Top button subtle effects */
#cookie{ transition: opacity .25s ease }
#topBtn{ transition: opacity .2s ease, transform .1s ease }
#topBtn:hover{ transform: translateY(-2px) }

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *{ transition: none !important }
  .card:hover, article:hover, .btn:hover, .sidebar a:hover, #topBtn:hover { transform: none !important }
}

.header{background:#0b1220cc;backdrop-filter: blur(12px)}
:root.light .header{background:#ffffffd0;backdrop-filter: blur(12px)}


/* ===== Two-zone sidebar (scrollable links + fixed tools) ===== */
.sidebar{
  display:flex;
  flex-direction:column;
  position:sticky; top:64px;
  height:calc(100vh - 64px);
}
.sidebar .links{
  flex:1 1 auto;
  overflow-y:auto;
  padding-right:4px;
}
.sidebar .tools{
  margin-top:auto;
  padding-top:8px;
  border-top:1px solid var(--border);
}
.sidebar .tools a{ opacity:.9 }
.sidebar .tools a:hover{ opacity:1 }

@media (max-height: 740px){
  .sidebar a{ padding:8px 10px; }
}


/* ===== Layout top spacing fix ===== */
.header{position:sticky; top:0; z-index:100; }
main.container{padding-top:16px}
.hero{padding:42px 0 28px} /* was 84px; reduce to avoid empty top gap */

/* Sidebar track visual compactness */
.sidebar{top:56px; height:calc(100vh - 56px)}


/* ==== VERSION TEST v4 ==== */
.version-banner{position:sticky;top:0;z-index:120;margin:0;background:#c2410c;color:#fff;
  padding:8px 14px;font-weight:700;letter-spacing:.3px;border-bottom:2px solid rgba(255,255,255,.25)}
:root.light .version-banner{background:#c026d3}


/* ===== Modern Nav v5: Collapsible Sidebar + Top App Bar ===== */
:root{ --sbw: 72px; --sbw-expanded: 232px; }
body.sb-expanded{ --sbw: var(--sbw-expanded); }
.app{ display:grid; grid-template-columns: var(--sbw) 1fr; align-items:start; }

/* Top bar */
.topbar{position:sticky;top:0;z-index:120;background:#0b1220cc;backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
:root.light .topbar{background:#ffffffd0}
.topbar .row{display:flex;align-items:center;gap:10px;padding:10px 16px}
.topbar .spacer{flex:1 1 auto}

/* Sidebar */
.side{position:sticky;top:56px;height:calc(100vh - 56px);border-right:1px solid var(--border);background:var(--panel);transition:width .2s ease}
.side .logo{display:flex;align-items:center;gap:10px;padding:10px 12px}
.side .toggle{display:flex;align-items:center;justify-content:center;padding:6px}
.side .toggle button{border:1px solid var(--border);background:transparent;color:var(--ink);border-radius:10px;padding:8px 10px;cursor:pointer}
.side .navlist{overflow-y:auto;padding:6px 6px 10px 6px;height:calc(100% - 94px)}
.side a.item{display:flex;align-items:center;gap:12px;padding:10px 12px;margin:4px 6px;border-radius:10px;border:1px solid transparent;white-space:nowrap}
.side a.item .label{opacity:.95;transition:opacity .2s ease}
.side a.item:hover{background:rgba(255,255,255,.06);border-color:var(--border)}
.side a.item.active{background:linear-gradient(90deg, rgba(110,168,254,.18), rgba(110,168,254,.04));border-color:rgba(110,168,254,.5)}
/* collapsed labels hidden */
body:not(.sb-expanded) .side a.item .label{display:none}
body:not(.sb-expanded) .side{width:72px}
body.sb-expanded .side{width:var(--sbw-expanded)}

/* Main content spacing */
main.container{padding:18px 20px}

/* Mobile: slide-over drawer */
@media (max-width: 980px){
  .app{grid-template-columns: 1fr}
  .side{position:fixed;left:0;top:0;height:100vh;width:var(--sbw-expanded);transform:translateX(-110%);transition:transform .2s ease}
  body.sb-open .side{transform:none}
  .backdrop{position:fixed;inset:0;background:rgba(0,0,0,.4);backdrop-filter:blur(2px);display:none}
  body.sb-open .backdrop{display:block}
}

/* Simple icon style */
.icon{width:22px;height:22px;display:inline-block;stroke:none;fill:var(--ink)}
.theme-toggle{margin-right:8px}
.searchbar input{min-width:160px;max-width:280px}


/* ===== v6: Icon set + active indicator ===== */
.side a.item{position:relative}
.side a.item.active::before{
  content:"";
  position:absolute; left:0; top:6px; bottom:6px;
  width:3px; border-radius:3px;
  background:rgba(110,168,254,.9);
}
.icon{width:20px;height:20px;opacity:.95}
.side a.item:hover .icon{opacity:1}

/* ===== Stable Nav v6a ===== */
.app{display:grid;grid-template-columns:220px 1fr;align-items:start}
.topbar{position:sticky;top:0;z-index:200;background:#0b1220f2;backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
:root.light .topbar{background:#fffffff2}
.topbar .row{display:flex;align-items:center;gap:10px;padding:10px 16px}
.side{position:sticky;top:56px;height:calc(100vh - 56px);border-right:1px solid var(--border);background:var(--panel)}
.side .navlist{overflow-y:auto;height:100%;padding:8px 6px 10px}
.side .logo{display:flex;align-items:center;gap:10px;padding:10px 12px;border-bottom:1px solid var(--border)}
.side a.item{display:flex;align-items:center;gap:12px;padding:10px 12px;margin:4px 6px;border-radius:10px;border:1px solid transparent;white-space:nowrap}
.side a.item:hover{background:rgba(255,255,255,.06);border-color:var(--border)}
.side a.item.active{background:linear-gradient(90deg, rgba(110,168,254,.18), rgba(110,168,254,.04));border-color:rgba(110,168,254,.5)}
.icon{width:20px;height:20px;opacity:.95}
main.container{padding:18px 22px}

/* Mobile drawer */
@media (max-width: 980px){
  .app{grid-template-columns:1fr}
  .side{position:fixed;left:0;top:0;height:100vh;width:260px;transform:translateX(-105%);transition:transform .2s ease}
  body.drawer-open .side{transform:none}
  .backdrop{position:fixed;inset:0;background:rgba(0,0,0,.45);backdrop-filter:blur(2px);display:none;z-index:190}
  body.drawer-open .backdrop{display:block}
}

/* Ensure no leftover narrow-mode rules */
body:not(.sb-expanded) .side a.item .label{display:inline}
body:not(.sb-expanded) .side{width:auto}