/* solaten.online — original stylesheet. No web fonts, no remote assets, no third-party requests. */

:root{
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --bg:#f6f6f4;
  --bg-2:#eceae5;
  --surface:#ffffff;
  --surface-2:#f3f2ef;
  --ink:#14181d;
  --ink-2:#39424e;
  --muted:#6a7381;
  --line:#e0dfd9;
  --line-2:#d0cec6;

  --brand:#b4471b;
  --brand-ink:#8f3512;
  --brand-soft:#fdf1ea;
  --brand-line:#f0d3c2;
  --amber:#c07d10;
  --amber-soft:#fdf6e6;
  --steel:#41576e;
  --steel-soft:#eef2f6;

  --radius:14px;
  --radius-sm:9px;
  --radius-lg:20px;
  --shadow:0 1px 2px rgba(16,20,26,.05),0 8px 24px -12px rgba(16,20,26,.16);
  --shadow-lg:0 2px 4px rgba(16,20,26,.05),0 22px 48px -18px rgba(16,20,26,.24);
  --maxw:1180px;
}

@media (prefers-color-scheme:dark){
  :root{
    --bg:#0e1116;
    --bg-2:#0a0d11;
    --surface:#161b22;
    --surface-2:#1c222b;
    --ink:#e8eaed;
    --ink-2:#bdc4ce;
    --muted:#8b95a3;
    --line:#252c36;
    --line-2:#323b47;

    --brand:#ef7f47;
    --brand-ink:#ffa877;
    --brand-soft:#241610;
    --brand-line:#3d2418;
    --amber:#e0a63a;
    --amber-soft:#211b0d;
    --steel:#9fb6cd;
    --steel-soft:#161d25;

    --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -12px rgba(0,0,0,.6);
    --shadow-lg:0 2px 4px rgba(0,0,0,.4),0 22px 48px -18px rgba(0,0,0,.7);
  }
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

img,svg{max-width:100%;height:auto;display:block}

a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,summary:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:3px;
  border-radius:4px;
}

h1,h2,h3,h4{
  line-height:1.22;
  margin:0 0 .5em;
  letter-spacing:-.018em;
  font-weight:700;
  color:var(--ink);
  text-wrap:balance;
}
h1{font-size:clamp(1.85rem,1.35rem + 2.2vw,3rem);letter-spacing:-.028em}
h2{font-size:clamp(1.4rem,1.15rem + 1.1vw,1.95rem);margin-top:2.2em}
h3{font-size:clamp(1.12rem,1.02rem + .45vw,1.32rem);margin-top:1.9em}
h4{font-size:1.02rem;margin-top:1.5em}
p{margin:0 0 1.15em}
ul,ol{margin:0 0 1.2em;padding-left:1.35em}
li{margin:.4em 0}
li::marker{color:var(--brand)}
strong{font-weight:650;color:var(--ink)}
small{font-size:.86rem}
hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}
code{font-family:var(--font-mono);font-size:.9em;background:var(--surface-2);padding:.12em .38em;border-radius:5px}

.skip{
  position:absolute;left:-9999px;top:0;
  background:var(--brand);color:#fff;padding:.7rem 1.1rem;z-index:100;border-radius:0 0 8px 0;
}
.skip:focus{left:0}

.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,4vw,32px)}

/* ---------- Affiliate disclosure bar (first element in the document) ---------- */
.adbar{
  background:var(--brand);
  color:#fff;
  font-size:.83rem;
  line-height:1.45;
  letter-spacing:.005em;
}
@media (prefers-color-scheme:dark){ .adbar{background:#7d2f0f;color:#ffe9dd} }
.adbar .wrap{display:flex;gap:.6rem;align-items:center;justify-content:center;padding-top:.55rem;padding-bottom:.55rem;text-align:center;flex-wrap:wrap}
.adbar strong{color:inherit;font-weight:700}
.adbar a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.adbar-tag{
  flex:none;
  border:1px solid currentColor;
  border-radius:999px;
  padding:.05rem .5rem;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.09em;
  text-transform:uppercase;
}

/* ---------- Header ---------- */
.site-head{
  position:sticky;top:0;z-index:40;
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(1.6) blur(12px);
  -webkit-backdrop-filter:saturate(1.6) blur(12px);
  border-bottom:1px solid var(--line);
}
.site-head .wrap{display:flex;align-items:center;gap:1rem;min-height:62px}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);font-weight:700;letter-spacing:-.02em;font-size:1.06rem}
.brand:hover{text-decoration:none}
.brand-mark{
  width:30px;height:30px;flex:none;border-radius:8px;
  background:linear-gradient(145deg,var(--brand),var(--amber));
  display:grid;place-items:center;color:#fff;font-size:.82rem;font-weight:800;letter-spacing:.02em;
}
.brand-sub{color:var(--muted);font-weight:500;font-size:.78rem;letter-spacing:.04em;text-transform:uppercase;display:none}
@media (min-width:900px){.brand-sub{display:inline}}

.nav{margin-left:auto;display:none;gap:.2rem;align-items:center}
@media (min-width:920px){.nav{display:flex}}
.nav a{
  color:var(--ink-2);font-size:.92rem;font-weight:550;
  padding:.45rem .7rem;border-radius:8px;
}
.nav a:hover{background:var(--surface-2);color:var(--ink);text-decoration:none}
.nav a[aria-current="page"]{color:var(--brand);background:var(--brand-soft)}

.nav-btn{
  margin-left:auto;display:inline-flex;align-items:center;gap:.5rem;
  background:var(--surface);border:1px solid var(--line-2);color:var(--ink);
  border-radius:9px;padding:.45rem .7rem;font-size:.88rem;font-weight:600;cursor:pointer;
}
@media (min-width:920px){.nav-btn{display:none}}
.nav-btn svg{width:16px;height:16px}
.nav-drawer{display:none;border-top:1px solid var(--line);background:var(--surface)}
.nav-drawer[data-open]{display:block}
@media (min-width:920px){.nav-drawer{display:none!important}}
.nav-drawer .wrap{display:grid;grid-template-columns:1fr 1fr;gap:.2rem;padding-top:.7rem;padding-bottom:.9rem}
.nav-drawer a{padding:.55rem .4rem;color:var(--ink-2);font-size:.93rem;font-weight:550}

/* ---------- Layout ---------- */
.shell{flex:1 0 auto;padding:clamp(1.6rem,4vw,3rem) 0 clamp(2.5rem,6vw,4.5rem)}
.cols{display:grid;gap:clamp(1.6rem,3vw,2.6rem);align-items:start}
@media (min-width:1040px){
  .cols{grid-template-columns:minmax(0,1fr) 316px}
  .cols.narrow{grid-template-columns:minmax(0,1fr)}
}
.content{min-width:0}
.content>*:first-child{margin-top:0}
.prose{max-width:72ch}
.prose h2,.prose h3{scroll-margin-top:96px}

.rail{display:flex;flex-direction:column;gap:1.1rem;min-width:0}
@media (min-width:1040px){.rail{position:sticky;top:82px}}

/* ---------- Article head ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.45rem;
  font-size:.74rem;font-weight:700;letter-spacing:.11em;text-transform:uppercase;
  color:var(--brand);background:var(--brand-soft);border:1px solid var(--brand-line);
  padding:.28rem .66rem;border-radius:999px;margin-bottom:1rem;
}
.lede{font-size:clamp(1.06rem,1rem + .4vw,1.24rem);color:var(--ink-2);line-height:1.6;max-width:66ch}
.byline{
  display:flex;flex-wrap:wrap;gap:.45rem .9rem;align-items:center;
  font-size:.88rem;color:var(--muted);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:.85rem 0;margin:1.5rem 0 1.8rem;
}
.byline strong{color:var(--ink);font-weight:600}
.byline .dot{color:var(--line-2)}

/* ---------- Boxes ---------- */
.box{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(1rem,2.2vw,1.4rem);margin:1.8rem 0;box-shadow:var(--shadow);
}
.box>*:last-child{margin-bottom:0}
.box-title{
  font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);margin:0 0 .6rem;
}
.box.disclosure{border-color:var(--brand-line);background:var(--brand-soft)}
.box.disclosure .box-title{color:var(--brand-ink)}
.box.note{background:var(--steel-soft);border-color:var(--line)}
.box.warn{background:var(--amber-soft);border-color:var(--line)}
.box.plain{box-shadow:none;background:var(--surface-2)}

.keyfacts{list-style:none;padding:0;margin:0;display:grid;gap:.55rem}
.keyfacts li{display:grid;grid-template-columns:minmax(120px,34%) 1fr;gap:.2rem .9rem;margin:0;font-size:.95rem}
.keyfacts b{color:var(--muted);font-weight:600;font-size:.85rem;letter-spacing:.02em}
@media (max-width:520px){.keyfacts li{grid-template-columns:1fr}}

/* ---------- Table of contents ---------- */
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.05rem 1.2rem;box-shadow:var(--shadow)}
.toc h2,.toc .box-title{margin-top:0}
.toc ol{list-style:none;counter-reset:toc;padding:0;margin:0;font-size:.92rem}
.toc li{counter-increment:toc;margin:.15rem 0}
.toc a{display:flex;gap:.6rem;color:var(--ink-2);padding:.28rem 0;line-height:1.4}
.toc a::before{content:counter(toc,decimal-leading-zero);color:var(--brand);font-variant-numeric:tabular-nums;font-size:.8rem;font-weight:700;flex:none;padding-top:.1em}
.toc a:hover{color:var(--brand);text-decoration:none}

/* ---------- CTA ---------- */
.cta-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(1.05rem,2.4vw,1.5rem);box-shadow:var(--shadow);margin:2rem 0;
  position:relative;overflow:hidden;
}
.cta-card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--brand),var(--amber));
}
.cta-card h3,.cta-card h4{margin-top:0}
.cta-card p{font-size:.97rem;color:var(--ink-2)}
.cta-card p:last-child{margin-bottom:0}
.rail .cta-card{margin:0}

.btn{
  display:flex;align-items:center;justify-content:center;gap:.5rem;
  width:100%;text-align:center;
  background:linear-gradient(180deg,var(--brand),var(--brand-ink));
  color:#fff;font-weight:650;font-size:1.02rem;letter-spacing:.005em;
  padding:.85rem 1.2rem;border-radius:11px;border:1px solid var(--brand-ink);
  box-shadow:0 1px 0 rgba(255,255,255,.18) inset,0 6px 18px -8px rgba(180,71,27,.7);
  transition:transform .12s ease,filter .12s ease;
}
.btn:hover{text-decoration:none;filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.btn.small{font-size:.94rem;padding:.7rem 1rem}
.btn-arrow{flex:none;width:17px;height:17px}

.btn-label{
  display:block;text-align:center;margin:.5rem 0 0;
  font-size:.78rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--brand-ink);
}
.btn-note{
  display:block;text-align:center;margin:.35rem 0 0;
  font-size:.82rem;line-height:1.5;color:var(--muted);
}
.cta-card .btn-note:last-child{margin-bottom:0}

/* ---------- Figures ---------- */
figure{margin:2.2rem 0}
figure img{
  width:100%;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);
}
figcaption{
  margin-top:.65rem;font-size:.87rem;line-height:1.55;color:var(--muted);
  padding-left:.85rem;border-left:3px solid var(--brand-line);
}
figcaption b{color:var(--ink-2);font-weight:600}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;margin:1.8rem 0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:.94rem;min-width:520px}
th,td{text-align:left;padding:.72rem .95rem;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--surface-2);font-size:.79rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:700}
tbody tr:last-child td{border-bottom:0}

/* ---------- Cards grid ---------- */
.grid{display:grid;gap:1rem;margin:1.8rem 0}
@media (min-width:640px){.grid.two{grid-template-columns:1fr 1fr}}
@media (min-width:760px){.grid.three{grid-template-columns:repeat(3,1fr)}}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.1rem 1.2rem;box-shadow:var(--shadow);
}
.card h3,.card h4{margin-top:0;font-size:1.05rem}
.card p:last-child{margin-bottom:0}
.card p{font-size:.94rem;color:var(--ink-2);margin-bottom:.6rem}
a.card{display:block;color:inherit}
a.card:hover{text-decoration:none;border-color:var(--brand-line);box-shadow:var(--shadow-lg)}
a.card h3,a.card h4{color:var(--brand)}
.card-tag{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:.4rem}

/* ---------- Definition list (glossary) ---------- */
.defs{margin:1.8rem 0;display:grid;gap:.1rem}
.defs dt{font-weight:650;color:var(--ink);margin-top:1.1rem;font-size:1.02rem}
.defs dd{margin:.25rem 0 0;color:var(--ink-2);font-size:.96rem}

/* ---------- Steps ---------- */
.steps{list-style:none;counter-reset:step;padding:0;margin:1.8rem 0;display:grid;gap:.85rem}
.steps li{
  counter-increment:step;position:relative;margin:0;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:.95rem 1.1rem .95rem 3.1rem;
}
.steps li::before{
  content:counter(step);position:absolute;left:1rem;top:.95rem;
  width:1.55rem;height:1.55rem;border-radius:50%;
  background:var(--brand-soft);border:1px solid var(--brand-line);color:var(--brand-ink);
  display:grid;place-items:center;font-size:.8rem;font-weight:700;
}
.steps b{display:block;margin-bottom:.15rem}
.steps p{margin:0;font-size:.94rem;color:var(--ink-2)}

/* ---------- Footer ---------- */
.site-foot{
  flex:none;margin-top:auto;
  background:var(--bg-2);border-top:1px solid var(--line);
  font-size:.9rem;color:var(--muted);
}
.foot-top{display:grid;gap:1.8rem;padding:clamp(2rem,4vw,3rem) 0 1.6rem}
@media (min-width:760px){.foot-top{grid-template-columns:1.5fr 1fr 1fr}}
.foot-col h2{font-size:.76rem;letter-spacing:.11em;text-transform:uppercase;color:var(--ink);margin:0 0 .8rem}
.foot-col ul{list-style:none;padding:0;margin:0}
.foot-col li{margin:.3rem 0}
.foot-col a{color:var(--ink-2)}
.foot-col a:hover{color:var(--brand)}
.foot-id{font-style:normal;line-height:1.7}
.foot-id b{display:block;color:var(--ink);font-size:.98rem;margin-bottom:.2rem}
.foot-legal{border-top:1px solid var(--line);padding:1.2rem 0 2.2rem;display:grid;gap:.7rem;font-size:.84rem;line-height:1.6}
.foot-legal p{margin:0}

/* ---------- Misc ---------- */
.muted{color:var(--muted)}
.srcs{font-size:.92rem}
.srcs li{margin:.5rem 0}
.updated{font-size:.85rem;color:var(--muted);margin-top:2.5rem;padding-top:1rem;border-top:1px solid var(--line)}
.center{text-align:center}
.mt0{margin-top:0}
.err-code{font-size:clamp(3.5rem,10vw,6rem);font-weight:800;color:var(--brand);line-height:1;letter-spacing:-.04em;margin:0 0 .3rem}