:root{
  --ink:#0e1418;--ink-2:#3d4c55;--muted:#66757e;--line:#e3e8ea;--line-2:#eef2f3;
  --paper:#fff;--soft:#f6f9fa;--acc:#0e7c8a;--acc-ink:#08525c;--acc-soft:#e4f4f6;
  --lime:#5f9e21;--warn:#a15c00;--warn-soft:#fdf4e6;
  --max:1180px;--r:14px;--r-s:9px;
  --sans:"Inter var","Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,ui-sans-serif,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,"JetBrains Mono",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{
    --ink:#e9eef0;--ink-2:#b7c4c9;--muted:#8b9aa1;--line:#242e33;--line-2:#1b2429;
    --paper:#0b1014;--soft:#111a1f;--acc:#4bc4d3;--acc-ink:#8ee0ea;--acc-soft:#0f2b30;
    --lime:#96d24a;--warn:#e0a94b;--warn-soft:#241c0d;
  }
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:17px;line-height:1.65;font-feature-settings:"kern","liga","cv11";
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto}
a{color:var(--acc-ink);text-decoration:none;border-bottom:1px solid color-mix(in srgb,var(--acc) 35%,transparent)}
a:hover{border-bottom-color:var(--acc)}
h1,h2,h3,h4{line-height:1.1;letter-spacing:-.022em;font-weight:660;margin:0}
h1{font-size:clamp(2.1rem,4.6vw,3.5rem);letter-spacing:-.032em;font-weight:700}
h2{font-size:clamp(1.5rem,2.6vw,2.05rem);margin:0 0 .55em}
h3{font-size:1.14rem;margin:2em 0 .4em;letter-spacing:-.012em}
h4{font-size:.98rem;margin:1.5em 0 .3em}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.15em;padding-left:1.35em}
li{margin:.35em 0}
li::marker{color:var(--muted)}
strong{font-weight:650}
small{font-size:.85em}
.wrap{width:min(var(--max),calc(100% - 2.75rem));margin-inline:auto}
.skip{position:absolute;left:-9999px}
.skip:focus{left:1rem;top:1rem;z-index:99;background:var(--paper);padding:.7rem 1rem;border:1px solid var(--line);border-radius:var(--r-s)}
.mono{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:500}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:1.1rem;min-height:66px}
.brand{display:flex;align-items:center;gap:.6rem;margin-right:auto;border:0;color:var(--ink);
  font-weight:680;letter-spacing:-.02em;font-size:1.02rem;white-space:nowrap}
.brand .glyph{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;
  background:var(--ink);color:var(--paper);font-family:var(--mono);font-size:.72rem;font-weight:600;letter-spacing:0}
.brand .glyph::after{content:"";width:5px;height:5px;border-radius:50%;background:var(--acc);
  position:relative;left:9px;top:6px;margin-left:-5px}
.menu{display:flex;gap:.1rem;flex-wrap:wrap}
.menu a{border:0;color:var(--muted);font-size:.9rem;font-weight:500;padding:.4rem .6rem;border-radius:7px}
.menu a:hover{color:var(--ink);background:var(--soft)}
.menu a[aria-current=page]{color:var(--ink);background:var(--soft);font-weight:600}
.btn{display:inline-flex;align-items:center;gap:.45rem;border:1px solid var(--ink);background:var(--ink);
  color:var(--paper);font-weight:600;font-size:.9rem;padding:.5rem .95rem;border-radius:8px;white-space:nowrap}
.btn:hover{background:var(--ink-2);border-color:var(--ink-2);color:var(--paper)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:var(--soft);color:var(--ink)}
.top .btn{display:none}
@media(min-width:1000px){.top .btn{display:inline-flex}}

/* ---------- hero ---------- */
.hero{position:relative;padding:4.4rem 0 2.6rem;border-bottom:1px solid var(--line);overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;
  background-image:radial-gradient(color-mix(in srgb,var(--acc) 22%,transparent) 1px,transparent 1px);
  background-size:22px 22px;
  mask-image:radial-gradient(120% 80% at 88% 0,#000,transparent 62%);
  -webkit-mask-image:radial-gradient(120% 80% at 88% 0,#000,transparent 62%);opacity:.55}
.hero h1{max-width:23ch;margin:.5rem 0 0}
.hero .lead{font-size:1.15rem;color:var(--ink-2);max-width:62ch;margin:1.1rem 0 0}
.hero .acts{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.7rem}
.byline{display:flex;flex-wrap:wrap;gap:.35rem .9rem;margin-top:1.6rem;font-size:.82rem;color:var(--muted)}
.byline span{display:inline-flex;align-items:center;gap:.35rem}
.byline span::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--acc)}
.crumbs{font-size:.8rem;color:var(--muted);padding-top:1.6rem}
.crumbs a{color:var(--muted);border-bottom-color:transparent}
.crumbs a:hover{color:var(--ink)}

/* ---------- shell / toc ---------- */
.shell{display:block;padding:2.6rem 0 1rem}
.doc{min-width:0;max-width:74ch}
.side{display:none}
@media(min-width:1080px){
  .shell{display:grid;grid-template-columns:minmax(0,1fr) 232px;gap:4rem;align-items:start}
  .side{display:block;position:sticky;top:96px;order:2;font-size:.87rem}
  .doc{order:1}
}
.side .mono{display:block;padding-bottom:.6rem;border-bottom:1px solid var(--line)}
.side ol{list-style:none;margin:.7rem 0 0;padding:0;counter-reset:t}
.side li{margin:0}
.side a{display:block;color:var(--muted);border:0;padding:.3rem 0;line-height:1.4}
.side a:hover{color:var(--acc-ink)}
.side .after{margin-top:1.5rem;padding-top:1.1rem;border-top:1px solid var(--line)}

/* ---------- blocks ---------- */
.sec{padding:1.4rem 0 2.6rem;border-top:1px solid var(--line-2)}
.sec:first-child{border-top:0;padding-top:0}
.sec > .mono{display:block;margin-bottom:.7rem}
.answer{border:1px solid var(--line);border-left:3px solid var(--acc);border-radius:var(--r);
  background:var(--soft);padding:1.25rem 1.4rem;margin:0 0 2.4rem}
.answer .mono{color:var(--acc-ink);display:block;margin-bottom:.5rem}
.answer p:last-child{margin-bottom:0}
.answer p{font-size:1.03rem}
.note{border:1px solid var(--line);border-radius:var(--r);padding:1.15rem 1.3rem;background:var(--paper);margin:1.8rem 0}
.note.warn{background:var(--warn-soft);border-color:color-mix(in srgb,var(--warn) 35%,var(--line))}
.note .mono{display:block;margin-bottom:.4rem}
.note.warn .mono{color:var(--warn)}
.note p:last-child{margin-bottom:0}
.grid{display:grid;gap:.9rem;grid-template-columns:repeat(auto-fit,minmax(232px,1fr));margin:1.6rem 0}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(290px,1fr))}
.card{border:1px solid var(--line);border-radius:var(--r);padding:1.15rem 1.25rem;background:var(--paper)}
.card h3{margin:.15rem 0 .4rem;font-size:1.03rem}
.card p:last-child{margin-bottom:0}
.card p{font-size:.95rem;color:var(--ink-2)}
.card .mono{display:block;margin-bottom:.55rem}
.stats{display:grid;gap:0;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin:2rem 0;background:var(--paper)}
.stats div{padding:1.15rem 1.25rem;border-right:1px solid var(--line)}
.stats div:last-child{border-right:0}
.stats b{display:block;font-size:1.85rem;font-weight:680;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;line-height:1.1;margin-bottom:.25rem}
.stats span{font-size:.86rem;color:var(--muted);display:block}
@media(max-width:760px){.stats div{border-right:0;border-bottom:1px solid var(--line)}.stats div:last-child{border-bottom:0}}

/* rank list */
.rank{border:1px solid var(--line);border-radius:var(--r);padding:1.3rem 1.4rem;margin:0 0 .9rem;
  display:grid;grid-template-columns:2.3rem 1fr;gap:0 1rem;background:var(--paper)}
.rank .n{font-family:var(--mono);font-size:1.05rem;font-weight:600;color:var(--muted);
  font-variant-numeric:tabular-nums;padding-top:.15rem}
.rank h3{margin:0 0 .35rem;font-size:1.12rem;display:flex;align-items:center;gap:.55rem;flex-wrap:wrap}
.rank p{margin:0 0 .7rem;font-size:.96rem;color:var(--ink-2)}
.rank p:last-child{margin-bottom:0}
.rank .why{color:var(--ink)}
.rank.top{border-color:color-mix(in srgb,var(--acc) 45%,var(--line));background:
  linear-gradient(180deg,var(--acc-soft),transparent 42%)}
.rank.top .n{color:var(--acc-ink)}
.pill{font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;
  border:1px solid var(--line);border-radius:999px;padding:.2rem .5rem;color:var(--muted);font-weight:600}
.pill.acc{background:var(--acc);border-color:var(--acc);color:#fff}
@media (prefers-color-scheme:dark){.pill.acc{color:#04191c}}
.pro-con{display:grid;gap:.35rem 1.4rem;grid-template-columns:1fr;margin:.5rem 0 0;font-size:.92rem}
@media(min-width:620px){.pro-con{grid-template-columns:1fr 1fr}}
.pro-con ul{list-style:none;margin:0;padding:0}
.pro-con li{padding-left:1.25rem;position:relative;color:var(--ink-2)}
.pro-con .p li::before{content:"+";position:absolute;left:0;color:var(--lime);font-weight:700}
.pro-con .c li::before{content:"−";position:absolute;left:0;color:var(--warn);font-weight:700}

/* tables */
figure.tbl{margin:1.9rem 0}
figure.tbl figcaption{font-size:.84rem;color:var(--muted);margin-bottom:.6rem}
.scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--paper)}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:.92rem}
caption{text-align:left;font-size:.84rem;color:var(--muted);padding:.9rem 1rem 0}
th,td{text-align:left;vertical-align:top;padding:.8rem 1rem;border-bottom:1px solid var(--line-2)}
thead th{font-family:var(--mono);font-size:.66rem;letter-spacing:.11em;text-transform:uppercase;
  color:var(--muted);font-weight:600;border-bottom:1px solid var(--line);background:var(--soft);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
tbody th{font-weight:600;white-space:nowrap}

/* steps + timeline */
ol.steps{list-style:none;counter-reset:s;padding:0;margin:1.7rem 0}
ol.steps li{counter-increment:s;position:relative;padding:0 0 1.35rem 3rem;border-left:1px solid var(--line);margin:0}
ol.steps li:last-child{border-left-color:transparent;padding-bottom:0}
ol.steps li::before{content:counter(s);position:absolute;left:-16px;top:-2px;width:31px;height:31px;
  border-radius:50%;border:1px solid var(--line);background:var(--paper);display:grid;place-items:center;
  font-family:var(--mono);font-size:.75rem;font-weight:600;color:var(--acc-ink)}
ol.steps b{display:block;margin-bottom:.15rem}
ol.steps p{margin:0;font-size:.95rem;color:var(--ink-2)}
ul.checks{list-style:none;padding:0;margin:1.5rem 0}
ul.checks li{position:relative;padding-left:1.75rem;margin:.5rem 0}
ul.checks li::before{content:"";position:absolute;left:0;top:.52em;width:.62rem;height:.32rem;
  border-left:2px solid var(--acc);border-bottom:2px solid var(--acc);transform:rotate(-45deg)}

/* glossary */
dl.gloss{margin:1.7rem 0;border-top:1px solid var(--line)}
dl.gloss div{padding:1rem 0;border-bottom:1px solid var(--line-2)}
dl.gloss dt{font-weight:640;letter-spacing:-.01em}
dl.gloss dd{margin:.2rem 0 0;color:var(--ink-2);font-size:.96rem}

/* faq */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line-2)}
.faq summary{cursor:pointer;font-weight:600;padding:1rem 2.2rem 1rem 0;position:relative;list-style:none;letter-spacing:-.01em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:.4rem;top:1.35rem;width:.55rem;height:.55rem;
  border-right:1.5px solid var(--muted);border-bottom:1.5px solid var(--muted);transform:rotate(45deg);transition:transform .15s}
.faq details[open] summary::after{transform:rotate(225deg)}
.faq details > div{padding:0 0 1.05rem;color:var(--ink-2);font-size:.96rem;max-width:66ch}
.faq details > div p:last-child{margin-bottom:0}

/* cta + sources */
.cta{border:1px solid var(--line);border-radius:var(--r);padding:1.6rem;margin:2.4rem 0;background:var(--soft)}
.cta h3{margin:.1rem 0 .5rem;font-size:1.15rem}
.cta p{color:var(--ink-2);font-size:.96rem}
.cta .acts{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:1.1rem}
.src{font-size:.88rem;color:var(--muted)}
.src ol{padding-left:1.3rem}
.src a{overflow-wrap:anywhere}
.fine{font-size:.82rem;color:var(--muted);margin-top:1.2rem}
.next{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));margin:1.6rem 0}
.next a{border:1px solid var(--line);border-radius:var(--r);padding:1rem 1.15rem;display:block;color:var(--ink)}
.next a:hover{border-color:var(--acc);background:var(--soft)}
.next a b{display:block;font-weight:640;margin-bottom:.15rem}
.next a span{font-size:.88rem;color:var(--muted)}

/* footer */
footer{margin-top:3.5rem;border-top:1px solid var(--line);background:var(--soft)}
.fgrid{display:grid;gap:2rem;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));padding:3rem 0 2rem}
.fgrid h3{font-family:var(--mono);font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muted);font-weight:600;margin:0 0 .7rem}
.fgrid a{display:block;margin:.3rem 0;color:var(--ink-2);font-size:.92rem;border:0}
.fgrid a:hover{color:var(--acc-ink)}
.fgrid .about p{font-size:.9rem;color:var(--muted);max-width:34ch}
.legal{border-top:1px solid var(--line);padding:1.1rem 0;font-size:.8rem;color:var(--muted);
  display:flex;flex-wrap:wrap;gap:.4rem 1.2rem}
@media(max-width:760px){
  .hero{padding-top:2.8rem}
  .bar{flex-wrap:wrap;padding:.7rem 0;gap:.6rem}
  .menu{width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:.15rem;-webkit-overflow-scrolling:touch}
  body{font-size:16.5px}
}
@media print{.top,.side,footer,.cta{display:none}}