/* Petrixia — shared stylesheet */
:root{
  --bg:#fff3ec; --panel:#ffffff; --panel-2:#fff9f4;
  --fg:#14322e; --muted:#5e726e; --rule:#efe0d6;
  --accent:#17796d; --accent-soft:#e3f3f0;
  --brand-teal:#38b5a6; --brand-coral:#ff7a66; --coral-text:#c4462f; --coral-soft:#ffe7e1;
  --slab:#12312d; --slab-fg:#e6f2ef; --slab-muted:#84a29c;
  --ok:#17796d;
  --shadow:0 1px 2px rgba(20,50,46,.04),0 8px 28px rgba(20,50,46,.07);
  --maxw:1080px;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0e1a18; --panel:#142522; --panel-2:#172c28;
    --fg:#eaf3f1; --muted:#96a9a5; --rule:#233935;
    --accent:#4fd1c0; --accent-soft:#16332f;
    --brand-teal:#38b5a6; --brand-coral:#ff8f7d; --coral-text:#ff8f7d; --coral-soft:#2e1d1a;
    --slab:#0a1413; --slab-fg:#e6f2ef; --slab-muted:#7d9994;
    --ok:#5fd1b4;
    --shadow:0 1px 2px rgba(0,0,0,.32),0 10px 30px rgba(0,0,0,.4);
  }
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);
  font:400 17px/1.65 ui-serif,"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  -webkit-font-smoothing:antialiased}
.sans{font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(1.2rem,4vw,2rem)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
h1,h2,h3{letter-spacing:-.02em;font-weight:500;margin:0}
p{margin:0 0 1.1rem}
p:last-child{margin-bottom:0}
.skip{position:absolute;left:-9999px;top:0;background:var(--panel);color:var(--fg);padding:.7rem 1rem;z-index:100;border:1px solid var(--rule);border-radius:8px}
.skip:focus{left:1rem;top:1rem}

/* header */
header.site{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--rule)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:64px}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--fg)}
.brand:hover{text-decoration:none}
.brand .mark{width:30px;height:30px;flex:0 0 auto;display:block}
.brand .name{white-space:nowrap;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-weight:500;font-size:1.02rem;letter-spacing:.235em;text-transform:uppercase;color:var(--accent)}
.brand .dot{color:var(--brand-coral)}
.brand small{align-self:center;font:500 .62rem/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.18em;text-transform:uppercase;
  color:var(--muted);border:1px solid var(--rule);border-radius:999px;padding:.32rem .5rem}
nav.top{display:flex;gap:1.45rem;font:500 .84rem/1 ui-sans-serif,system-ui,sans-serif}
nav.top a{color:var(--muted)}
nav.top a:hover{color:var(--fg);text-decoration:none}
nav.top a[aria-current="page"]{color:var(--fg);border-bottom:1px solid var(--accent);padding-bottom:.35rem}
@media (max-width:900px){
  .bar{height:auto;flex-direction:column;align-items:flex-start;gap:.6rem;padding:.85rem 0 0}
  nav.top{width:100%;overflow-x:auto;gap:1.15rem;padding-bottom:.8rem;scrollbar-width:none;-ms-overflow-style:none}
  nav.top::-webkit-scrollbar{display:none}
  nav.top a{white-space:nowrap}
  nav.top a[aria-current="page"]{padding-bottom:0;border-bottom:0;text-decoration:underline;text-underline-offset:5px;text-decoration-color:var(--accent)}
}

/* heroes */
.eyebrow{font:500 .72rem/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.19em;text-transform:uppercase;color:var(--muted);margin:0 0 1.5rem}
.hero{padding:clamp(3.5rem,10vw,7rem) 0 clamp(2.5rem,7vw,4.5rem);border-bottom:1px solid var(--rule)}
.hero h1{font-size:clamp(2.5rem,6.4vw,4.3rem);line-height:1.03;max-width:18ch}
.hero .lede{font-size:clamp(1.1rem,2.1vw,1.32rem);color:var(--muted);max-width:60ch;margin-top:1.6rem}
.phero{padding:clamp(2.6rem,7vw,4.4rem) 0 clamp(2rem,5vw,3rem);border-bottom:1px solid var(--rule)}
.phero h1{font-size:clamp(2.1rem,4.6vw,3.3rem);line-height:1.06;max-width:20ch}
.phero .lede{font-size:clamp(1.04rem,1.9vw,1.2rem);color:var(--muted);max-width:62ch;margin-top:1.3rem}
.cta{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:2.4rem}
.btn{display:inline-block;font:500 .92rem/1 ui-sans-serif,system-ui,sans-serif;padding:.85rem 1.35rem;
  border-radius:999px;border:1px solid var(--accent);background:var(--accent);color:var(--bg)}
.btn:hover{text-decoration:none;opacity:.9}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--rule)}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent);opacity:1}

/* sections */
section{padding:clamp(3.2rem,8vw,5.6rem) 0;border-bottom:1px solid var(--rule)}
section.last{border-bottom:0}
.sec-head{max-width:62ch;margin-bottom:2.6rem}
.sec-head h2{font-size:clamp(1.75rem,3.4vw,2.5rem);line-height:1.12}
.sec-head p{margin-top:1rem;color:var(--muted)}

/* grids */
.grid{display:grid;gap:1.15rem}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
@media (max-width:960px){.g3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:760px){.g3,.g2{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--rule);border-radius:14px;padding:1.6rem 1.5rem;box-shadow:var(--shadow)}
.card h3{font-size:1.16rem;margin-bottom:.55rem}
.card p{color:var(--muted);font-size:.98rem}
.num{font:500 .72rem/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.16em;color:var(--accent);display:block;margin-bottom:.9rem}

/* diagram */
figure{margin:0}
.diagram{background:var(--panel);border:1px solid var(--rule);border-radius:14px;padding:1.6rem 1.2rem;box-shadow:var(--shadow);overflow-x:auto}
.diagram svg{display:block;width:100%;min-width:520px;height:auto}
figcaption{color:var(--muted);font-size:.9rem;margin-top:.95rem;font-family:ui-sans-serif,system-ui,sans-serif;line-height:1.55}
.svg-box{fill:var(--panel-2);stroke:var(--rule)}
.svg-box-a{fill:var(--accent-soft);stroke:var(--accent)}
.svg-t{fill:var(--fg);font-family:ui-sans-serif,system-ui,sans-serif;font-size:14px;font-weight:500}
.svg-s{fill:var(--muted);font-family:ui-sans-serif,system-ui,sans-serif;font-size:11.5px}
.svg-l{stroke:var(--muted);stroke-width:1.4;fill:none}
.svg-cap{fill:var(--accent);font-family:ui-sans-serif,system-ui,sans-serif;font-size:10.5px;font-weight:600;letter-spacing:.12em}

/* code slab */
.slab{background:var(--slab);color:var(--slab-fg);border-radius:14px;padding:1.4rem 1.5rem;overflow-x:auto;border:1px solid var(--rule)}
.slab pre{margin:0;font:400 13.5px/1.85 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:pre}
.slab .c{color:var(--slab-muted)}
.slab{color:var(--slab-fg)}
.slab .k{color:#7fe0d0}
.slab-label{font:500 .7rem/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.17em;text-transform:uppercase;color:var(--muted);margin-bottom:.85rem}

/* table */
.tablewrap{overflow-x:auto;border:1px solid var(--rule);border-radius:14px;background:var(--panel);box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;min-width:560px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:.94rem}
th,td{text-align:left;padding:.95rem 1.2rem;border-bottom:1px solid var(--rule)}
th{font-weight:600;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
tbody tr:last-child td{border-bottom:0}
caption{text-align:left;padding:1.1rem 1.2rem 0;color:var(--muted);font-size:.86rem;font-family:ui-sans-serif,system-ui,sans-serif}
td.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88rem}
td.score{font-variant-numeric:tabular-nums;font-weight:600}
.pass{color:var(--ok)}
.fail{color:var(--coral-text)}

/* lists */
ul.plain{list-style:none;padding:0;margin:0}
ul.plain li{position:relative;padding-left:1.5rem;margin-bottom:.85rem;color:var(--muted)}
ul.plain li::before{content:"";position:absolute;left:0;top:.68em;width:7px;height:7px;border-radius:50%;background:var(--accent)}
ul.plain li strong{color:var(--fg);font-weight:500}
ul.cols{columns:2;column-gap:2.6rem}
@media (max-width:760px){ul.cols{columns:1}}
ul.cols li{break-inside:avoid}

/* roadmap */
.steps{list-style:none;padding:0;margin:0;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:auto 1fr;gap:1.3rem;padding:1.4rem 0;border-top:1px solid var(--rule)}
.steps li:first-child{border-top:0;padding-top:0}
.steps .marker{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;border:1px solid var(--rule);
  background:var(--panel);font:600 .85rem/1 ui-sans-serif,system-ui,sans-serif;color:var(--muted)}
.steps li[data-state="done"] .marker{background:var(--accent);border-color:var(--accent);color:var(--bg)}
.steps li[data-state="now"] .marker{border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.steps .marker::before{content:counter(s)}
.steps h3{font-size:1.12rem;margin-bottom:.3rem;display:flex;align-items:center;gap:.7rem;flex-wrap:wrap}
.steps p{color:var(--muted);font-size:.98rem;margin:0}
.chip{font:600 .62rem/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.14em;text-transform:uppercase;
  padding:.34rem .55rem;border-radius:999px;background:var(--accent-soft);color:var(--accent);border:1px solid var(--accent)}
.chip.muted{background:transparent;color:var(--muted);border-color:var(--rule)}

/* callout */
.callout{border:1px solid var(--rule);border-left:3px solid var(--accent);background:var(--panel);
  border-radius:0 14px 14px 0;padding:1.35rem 1.5rem;margin-top:2rem}
.callout p{color:var(--muted);font-size:.98rem}
.callout strong{color:var(--fg);font-weight:500}

/* two-column split */
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:2.5rem;align-items:start}
@media (max-width:820px){.split{grid-template-columns:1fr;gap:1.6rem}}

/* page-to-page nav */
.pagenav{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;padding:2.4rem 0 0;
  border-top:1px solid var(--rule);margin-top:1rem;font-family:ui-sans-serif,system-ui,sans-serif;font-size:.92rem}
.pagenav a{display:inline-flex;align-items:center;gap:.4rem}

/* footer */
footer.site{padding:3rem 0 3.5rem;font-family:ui-sans-serif,system-ui,sans-serif;font-size:.88rem;color:var(--muted);border-top:1px solid var(--rule)}
.foot-cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem;margin-bottom:2.4rem}
@media (max-width:760px){.foot-cols{grid-template-columns:1fr 1fr;gap:1.6rem}}
.foot-cols h4{font:600 .68rem/1 ui-sans-serif,system-ui,sans-serif;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0 0 .95rem}
.foot-cols ul{list-style:none;padding:0;margin:0}
.foot-cols li{margin-bottom:.55rem}
.foot-cols a{color:var(--fg)}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;align-items:center;
  padding-top:1.6rem;border-top:1px solid var(--rule)}
.foot-note{margin-top:1.4rem;font-size:.82rem;max-width:74ch}

/* brand mark */
.mk-head{fill:var(--panel);stroke:var(--brand-teal)}
.mk-ant{stroke:var(--brand-teal)}
.mk-bulb{fill:var(--brand-coral)}
.mk-visor{fill:var(--slab)}
.mk-eye{fill:var(--brand-teal)}
.tagline{font:500 .74rem/1.4 ui-sans-serif,system-ui,sans-serif;letter-spacing:.13em;
  text-transform:uppercase;color:var(--coral-text)}