/* RLSOK site (release/UX_SPEC.md 1.4): dark instrument style; accents are only the four status colours. */
:root{
  --bg:#0b0d0c;--panel:#111513;--panel2:#161b18;--ink:#ecebe5;--muted:#a9b2ad;--line:#28302c;
  --hw:#2fd27c;--sim:#e5b94e;--prog:#8fa3b8;--fail:#ef6b5b;--signal:#e5b94e;
  --sans:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"Cascadia Mono","SF Mono",Consolas,"PingFang SC","Microsoft YaHei",monospace;
  --scope-bg:#0b0d0c;--scope-grid:#1c2420;--scope-ink:#ecebe5;--scope-muted:#7b8680;--scope-band:rgba(236,235,229,.05)
}
*{box-sizing:border-box}
html{scroll-padding-top:76px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
img,video,canvas{max-width:100%}
a:focus-visible,button:focus-visible,summary:focus-visible,video:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:var(--bg);padding:10px 14px;z-index:20}.skip:focus{top:12px}
.wrap{width:min(1120px,calc(100% - 64px));margin:0 auto}
.muted{color:var(--muted)}
.mono{font-family:var(--mono)}

/* top bar */
.bar{position:sticky;top:0;z-index:10;background:rgba(11,13,12,.96);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;gap:20px;height:64px}
.brand{font:700 17px var(--mono);letter-spacing:.14em;text-decoration:none;display:inline-flex;align-items:center;min-height:44px}
.bar nav{display:flex;align-items:center;gap:22px;margin-left:auto;font-size:15px}
.bar nav a{text-decoration:none;color:var(--muted);min-height:44px;display:inline-flex;align-items:center}
.bar nav a:hover,.bar nav a[aria-current=page]{color:var(--ink)}
.bar nav a.navdl{color:var(--bg);background:var(--ink);padding:0 16px;font-weight:600;min-height:40px}
.lang{font:14px var(--mono);color:var(--ink);background:none;border:1px solid var(--line);min-height:40px;min-width:48px;padding:0 12px;cursor:pointer}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:48px;padding:0 22px;background:var(--ink);color:var(--bg);text-decoration:none;font:600 16px var(--sans);border:1px solid var(--ink);cursor:pointer}
.btn:hover{background:#fff}
.btn.big{min-height:60px;font-size:18px;padding:0 28px}
.btn.ghost{background:none;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--muted);background:var(--panel2)}
.btn small{font:500 13px var(--mono);opacity:.75}

/* status pill: the only four states */
.st{display:inline-flex;align-items:center;gap:8px;font:600 14px var(--sans);padding:3px 10px;border:1px solid currentColor;white-space:nowrap;line-height:1.5}
.st::before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor}
.st.hw{color:var(--hw)}.st.sim{color:var(--sim)}.st.prog{color:var(--prog)}.st.fail{color:var(--fail)}

/* hero */
.hero{display:grid;grid-template-columns:1fr 1.15fr;gap:48px;align-items:center;padding:64px 0 56px}
h1{font-size:clamp(34px,4.4vw,58px);line-height:1.12;letter-spacing:-.02em;font-weight:700;margin:0 0 20px}
.hero .sub{color:var(--muted);font-size:clamp(17px,1.5vw,20px);margin:0 0 32px;max-width:34em}
.cta-row{display:flex;flex-wrap:wrap;gap:12px 16px;align-items:center}
.dlline{color:var(--muted);font-size:16px;margin:14px 0 0}
.film{position:relative;margin:0;border:1px solid var(--line);background:#000}
.film video,.film img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
.badge{position:absolute;left:12px;top:12px;background:rgba(11,13,12,.85);border:1px solid var(--sim);color:var(--sim);padding:4px 10px;font:600 14px var(--sans);line-height:1.4}
.badge span{display:block;font-weight:400;color:var(--ink);font-size:13px}
.film figcaption{font-size:15px;color:var(--muted);padding:12px 14px;background:var(--panel);border-top:1px solid var(--line)}

/* sections */
.block{padding:72px 0 0}
h2{font-size:clamp(24px,2.6vw,34px);line-height:1.25;letter-spacing:-.01em;margin:0 0 28px;font-weight:700}
h3{font-size:19px;margin:0 0 8px;line-height:1.35}
p{margin:0 0 14px}

/* progress */
.progress{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:end;border:1px solid var(--line);background:var(--panel);padding:28px}
.progress h2{margin-bottom:22px}
.psteps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:p}
.psteps li{counter-increment:p;padding:14px 16px 16px;border-top:3px solid var(--line);font-size:16px;line-height:1.45}
.psteps li::before{content:counter(p) " ";font:600 14px var(--mono);color:var(--muted)}
.psteps li em{display:block;font-style:normal;font:600 14px var(--sans);margin-top:6px;color:var(--muted)}
.psteps li.done{border-top-color:var(--sim)}.psteps li.done em{color:var(--sim)}
.psteps li.next{border-top-color:var(--prog)}.psteps li.next em{color:var(--prog)}
.pbtns{display:flex;flex-direction:column;gap:10px}

/* how */
.how{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;list-style:none;margin:0;padding:0}
.how li{border:1px solid var(--line);background:var(--panel);padding:24px}
.how svg{display:block;width:100%;height:auto;margin-bottom:18px}
.how p{color:var(--muted)}

/* stories */
.stories{display:grid;gap:28px}
.story{display:grid;grid-template-columns:1fr 1.2fr;gap:28px;align-items:center;border:1px solid var(--line);background:var(--panel);padding:24px}
.story img{display:block;width:100%;height:auto;border:1px solid var(--line)}
.story p{color:var(--muted)}
.story a.more{color:var(--ink);font-weight:600;text-decoration:none;display:inline-flex;min-height:44px;align-items:center}
.story a.more:hover{text-decoration:underline}

/* tables */
.tbl{width:100%;border-collapse:collapse;font-size:16px}
.tbl th{font:600 14px var(--sans);color:var(--muted);text-align:left;padding:0 16px 12px 0;border-bottom:1px solid var(--line)}
.tbl td{padding:16px 16px 16px 0;border-bottom:1px solid var(--line);vertical-align:top}
.tbl td.r,.tbl th.r{text-align:right;padding-right:0}
.tblwrap{overflow-x:auto}
.caps td:first-child{font-weight:600}

ul.plain{list-style:none;margin:0;padding:0}
ul.plain li{padding:12px 0;border-bottom:1px solid var(--line)}
.linkmore{display:inline-flex;min-height:44px;align-items:center;font-weight:600;color:var(--ink)}

/* faq */
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;min-height:56px;display:flex;align-items:center;font-size:17px;font-weight:600;list-style:none;padding:8px 32px 8px 0;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;font:400 24px var(--mono);color:var(--muted)}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);padding:0 0 18px;margin:0;max-width:52em}

/* bottom cta + footer */
.cta{padding:80px 0 72px;text-align:center}
.cta p{color:var(--muted)}
.cta .cta-row{justify-content:center}
.foot{border-top:1px solid var(--line);padding:28px 0 40px}
.foot .wrap{display:flex;flex-wrap:wrap;gap:8px 24px;align-items:center;font-size:15px}
.foot a{color:var(--muted);text-decoration:none;min-height:44px;display:inline-flex;align-items:center}
.foot a:hover{color:var(--ink)}
.foot .cr{margin-left:auto;color:var(--muted);font-size:14px}

/* dialogs */
dialog{background:var(--panel);color:var(--ink);border:1px solid var(--line);padding:28px;max-width:min(520px,calc(100% - 32px))}
dialog::backdrop{background:rgba(0,0,0,.6)}
dialog h2{font-size:22px;margin-bottom:12px}
dialog p{color:var(--muted)}
dialog .dlist{display:flex;flex-direction:column;gap:10px;margin:18px 0}
dialog .dlist .btn{justify-content:flex-start}
dialog .x{position:absolute;right:12px;top:12px;background:none;border:0;color:var(--muted);font-size:24px;min-width:44px;min-height:44px;cursor:pointer}
.code{display:block;background:var(--bg);border:1px solid var(--line);padding:12px 14px;font:14px/1.6 var(--mono);overflow-wrap:anywhere;color:var(--ink)}

/* inner pages */
.page{padding:48px 0 32px}
.page h1{font-size:clamp(32px,4vw,48px)}
.lead{color:var(--muted);font-size:18px;max-width:46em;margin:0 0 36px}
.back{display:inline-flex;min-height:44px;align-items:center;color:var(--muted);text-decoration:none}
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;list-style:none;margin:0;padding:0;counter-reset:s}
.steps3 li{counter-increment:s;border:1px solid var(--line);background:var(--panel);padding:22px}
.steps3 li h3::before{content:counter(s) ". ";color:var(--muted)}
.steps3 svg{display:block;width:100%;height:auto;margin-bottom:16px}
.steps3 p{color:var(--muted)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.card{display:flex;flex-direction:column;gap:10px;border:1px solid var(--line);background:var(--panel);padding:22px;text-decoration:none;min-height:100%}
.card:hover{background:var(--panel2)}
.card p{color:var(--muted);margin:0}
.card .go{margin-top:auto;font-weight:600}
.legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin:0 0 8px}
.legend div{border:1px solid var(--line);background:var(--panel);padding:16px}
.legend p{color:var(--muted);margin:10px 0 0;font-size:16px}
.engrow details{margin-top:6px}
.engrow details summary{cursor:pointer;color:var(--muted);font-size:15px;min-height:36px;display:inline-flex;align-items:center}
.engrow details p{color:var(--muted);font-size:16px;margin:6px 0 0;max-width:46em}
.fails li{display:grid;grid-template-columns:110px 1fr auto;gap:16px;align-items:start}
.fails .date{font:14px var(--mono);color:var(--muted);padding-top:2px}
.fails p{margin:4px 0 0;color:var(--muted);font-size:16px}
.shot{display:block;width:100%;height:auto;border:1px solid var(--line)}
figure{margin:0}
figure.fig figcaption{color:var(--muted);font-size:15px;padding:10px 0 0}
.note{color:var(--muted);font-size:16px}
.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:24px 0}
.kv div{border:1px solid var(--line);background:var(--panel);padding:18px}
.kv b{display:block;font-size:19px;margin-bottom:6px}
.kv p{color:var(--muted);font-size:16px;margin:0}
.round{border:1px solid var(--line);background:var(--panel);padding:20px;margin:14px 0}
.round h3{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.lbl{font-size:14px;color:var(--muted);margin:14px 0 4px}
.quote{font:14px/1.6 var(--mono);color:#cfcdc4;background:var(--bg);border:1px solid var(--line);padding:12px 14px;white-space:pre-wrap;overflow-wrap:anywhere;margin:0}
details.tech{margin:32px 0 0;border:1px solid var(--line);background:var(--panel);padding:0 20px}
details.tech > summary{cursor:pointer;min-height:52px;display:flex;align-items:center;font-weight:600}
details.tech[open]{padding-bottom:20px}
.srcline{font:13px var(--mono);color:var(--muted);overflow-wrap:anywhere}
.post{border-top:1px solid var(--line);padding:36px 0}
.post .date{font:14px var(--mono);color:var(--muted)}
.post h2{font-size:26px;margin:6px 0 20px}
.post .three{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:20px}
.post .three div{border:1px solid var(--line);background:var(--panel);padding:18px}
.post .three b{display:block;color:var(--muted);font-size:14px;margin-bottom:6px}
.post img,.post video{display:block;width:100%;height:auto;border:1px solid var(--line)}

/* scope (real ngspice waveform, evidence page) */
.scope{margin:0;border:1px solid var(--line);background:var(--panel)}
#scope{display:block;width:100%;height:clamp(240px,36vw,420px)}
.steps{display:flex;list-style:none;margin:0;padding:0;border-bottom:1px solid var(--line);font:14px var(--sans);overflow-x:auto}
.steps li{flex:1;padding:12px 14px;color:var(--muted);border-right:1px solid var(--line);white-space:nowrap;min-width:max-content}
.steps li:last-child{border-right:0}
.steps li.on{color:var(--ink);background:var(--panel2)}
.steps li.on[data-s=pass]{color:var(--sim)}
.steps li.on[data-s=fail]{color:var(--fail)}
.scope figcaption{display:flex;flex-wrap:wrap;gap:8px 16px;justify-content:space-between;padding:12px 16px;border-top:1px solid var(--line);font-size:15px;color:var(--muted)}
.stage{color:var(--ink)}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;gap:32px;padding:36px 0 40px}
  .progress{grid-template-columns:1fr}
  .pbtns{flex-direction:row;flex-wrap:wrap}
  .how,.steps3,.post .three{grid-template-columns:1fr}
  .story{grid-template-columns:1fr}
}
@media (max-width:700px){
  body{font-size:15px}
  .wrap{width:calc(100% - 32px)}
  .bar .wrap{height:56px;gap:12px}
  .bar nav{gap:14px;font-size:15px}
  .bar nav .hide-m{display:none}
  .bar nav a.navdl{padding:0 12px}
  .psteps{grid-template-columns:1fr 1fr}
  .psteps li{border-top-width:3px}
  .block{padding-top:56px}
  .cta-row .btn{width:100%}
  .fails li{grid-template-columns:1fr}
  .foot .cr{margin-left:0;width:100%}
  .tbl{font-size:15px}
  .tbl.stack thead{display:none}
  .tbl.stack tr{display:block;border-bottom:1px solid var(--line);padding:10px 0}
  .tbl.stack td{display:block;border:0;padding:4px 0}
  .tbl.stack td.r{text-align:left}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* minimum 15 px for every visible label (UX_SPEC 1.4) */
.lang,.st,.badge b,.badge span,.psteps li em,.tbl th,.date,.post .date,.fails .date,.foot .cr,.steps li,.post .three b,.engrow details summary,.scope figcaption,.srcline{font-size:15px}
[hidden]{display:none!important}
.lbl,.quote{font-size:15px}

/* spec 1.4: body text and the labels read inside it at 16px */
.psteps li em,.date,.post .date,.fails .date,.steps li,.post .three b{font-size:16px}
.hero h1{text-wrap:balance}