:root{--bg:#f6f7f9;--panel:#fff;--fg:#17181c;--muted:#5d6170;--line:#dfe1e6;--accent:#2563eb;--accent-fg:#fff;--soft:#eef3ff;--ok:#15803d;--warn:#b45309;--err:#b91c1c;--done:#dcfce7;--radius:12px}
@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--panel:#181b21;--fg:#eceef2;--muted:#a3a8b5;--line:#2c313a;--accent:#7aa2ff;--accent-fg:#0b0d12;--soft:#1b2335;--ok:#4ade80;--warn:#fbbf24;--err:#f87171;--done:#173a26}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}
.wrap{max-width:960px;margin:0 auto;padding:0 16px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* header / footer */
header.site{background:var(--panel);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:6px 20px;padding-block:10px}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.15rem;color:var(--fg);text-decoration:none}
.logo img{width:26px;height:26px}
.logo span{color:var(--accent)}
.menu{margin-left:auto;background:transparent;border:1px solid var(--line);border-radius:8px;padding:6px 12px;cursor:pointer;font-weight:600}
nav.tools{flex-basis:100%;display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:4px 16px;padding-bottom:6px}
nav.tools details{border:0;border-radius:0;padding:0;margin:0;background:none}
nav.tools summary{margin:8px 0 2px;padding:4px 10px;border-radius:8px;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
nav.tools summary:hover{background:var(--soft);color:var(--fg)}
nav.tools a{display:block;color:var(--fg);text-decoration:none;padding:6px 10px;border-radius:8px;font-size:.95rem}
nav.tools a:hover{background:var(--soft)}
nav.tools a[aria-current=page]{background:var(--soft);color:var(--accent);font-weight:600}
/* below 1000px the tools list is a menu opened by the button; above it, a fixed sidebar */
@media (max-width:999px){.menu[aria-expanded=false]+nav.tools{display:none}}
@media (min-width:1000px){
  body{padding-left:240px}
  header.site{position:fixed;top:0;bottom:0;left:0;width:240px;overflow-y:auto;border-bottom:0;border-right:1px solid var(--line)}
  header.site .wrap{display:block;padding:18px 12px}
  .logo{padding:0 10px}
  .menu{display:none}
  nav.tools{display:block;margin-top:10px}
  nav.tools summary{margin-top:12px}
}
footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem;padding-block:20px}
footer.site nav{margin-bottom:6px}
footer.site p{margin:0}

/* page */
main{padding-block:24px 40px}
h1{font-size:clamp(1.6rem,4vw,2.2rem);line-height:1.2;margin:0 0 .4rem}
.lead{color:var(--muted);margin:0 0 1.2rem;font-size:1.05rem}
.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:0;margin:0 0 20px;counter-reset:s}
.steps li{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px 12px 52px;counter-increment:s}
.steps li::before{content:counter(s);position:absolute;left:14px;top:12px;width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--accent-fg);display:grid;place-items:center;font-weight:700;font-size:.9rem}
@media (max-width:700px){.steps{grid-template-columns:1fr}}
.note{background:var(--soft);border-radius:var(--radius);padding:14px 16px;margin-bottom:20px}
.note h2{font-size:1rem;margin:0 0 .25rem}
.note p{margin:0}
article h2{font-size:1.35rem;margin:2rem 0 .6rem}
article h3{font-size:1.05rem;margin:1.4rem 0 .4rem}
article ol,article ul{padding-left:1.3rem}
article li{margin-bottom:.4rem}
details{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin-bottom:8px;background:var(--panel)}
summary{cursor:pointer;font-weight:600}
details p{margin:.5rem 0 0}

/* tool panel */
.tool{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:20px}
.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px}
button,select,input{font:inherit;color:inherit}
.btn{background:var(--accent);color:var(--accent-fg);border:0;border-radius:8px;padding:10px 18px;font-weight:600;cursor:pointer}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--line)}
.btn:disabled{opacity:.5;cursor:not-allowed}
select{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:9px 10px;max-width:100%}
label.inline{display:flex;align-items:center;gap:6px}
.status{margin:12px 0 0;font-weight:600}
.status.ok{color:var(--ok)}
.status.warn{color:var(--warn)}
.status.err{color:var(--err)}
dl.info{display:grid;grid-template-columns:auto 1fr;gap:4px 16px;margin:14px 0 0;font-size:.95rem}
dl.info dt{color:var(--muted)}
dl.info dd{margin:0;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.screen{position:relative;background:var(--bg);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.screen .placeholder{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);margin:0;padding:16px;text-align:center}
.meter{height:10px;background:var(--bg);border:1px solid var(--line);border-radius:99px;overflow:hidden;margin-top:10px}
.meter span{display:block;height:100%;width:0;background:var(--accent);transition:width .05s linear}

/* directory cards (all tests, guides) */
.group{margin-bottom:24px}
.group h2{font-size:1.15rem;margin:0 0 10px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.cards a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;color:var(--fg);text-decoration:none}
.cards a:hover{border-color:var(--accent)}
.cards b{display:block;color:var(--accent)}
.cards span{display:block;font-size:.9rem;color:var(--muted);margin-top:2px}
.os-guides{background:var(--soft);border-radius:var(--radius);padding:10px 14px;margin:1.6rem 0 0;font-weight:600}
.os-guides:empty{display:none}
.crumbs{font-size:.9rem;color:var(--muted);margin:0 0 .6rem}