:root{
  --paper:#F6F8F7;--surface:#fff;--ink:#1D2424;--muted:#58655F;--line:#D5DFDA;
  --green:#2BC088;--green-ink:#0E6B4A;--green-soft:#E3F6EE;--danger:#B3261E;
  --r:6px;--max:1120px;
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI Variable Text","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
:root[data-theme=dark]{--paper:#0F1514;--surface:#172120;--ink:#E8F0ED;--muted:#9BAAA4;--line:#2A3835;--green:#3FD9A0;--green-ink:#5FE3B4;--green-soft:#13302A;--danger:#FF8A80}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--paper:#0F1514;--surface:#172120;--ink:#E8F0ED;--muted:#9BAAA4;--line:#2A3835;--green:#3FD9A0;--green-ink:#5FE3B4;--green-soft:#13302A;--danger:#FF8A80}}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--font);min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
img{max-width:100%;height:auto}
a{color:var(--green-ink);text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--green);outline-offset:2px;border-radius:3px}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--paper);padding:8px 12px;z-index:100;border-radius:var(--r)}
.skip:focus{left:8px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.muted{color:var(--muted)}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0 0 .5em}

/* ruler: the signature element */
.ruler{height:14px;border-top:2px solid var(--ink);opacity:.9;
  background:
   repeating-linear-gradient(90deg,var(--ink) 0 1.5px,transparent 1.5px 12px) 0 0/100% 7px no-repeat,
   repeating-linear-gradient(90deg,var(--ink) 0 1.5px,transparent 1.5px 60px) 0 0/100% 14px no-repeat}
.ruler.flip{transform:scaleY(-1)}

/* header */
.site-header{background:var(--surface);position:sticky;top:0;z-index:50}
.bar{display:flex;align-items:center;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;letter-spacing:-.03em;color:var(--ink);text-decoration:none}
.search{position:relative;flex:1;max-width:460px;margin-left:auto}
.search input,.hero-search input,.filter,.zt-field input,.zt-field textarea,.zt-field select,.zt-row select,.zt-row input{width:100%;font:inherit;color:var(--ink);background:var(--paper);border:1.5px solid var(--line);border-radius:var(--r);padding:9px 12px}
.search input:focus,.hero-search input:focus,.filter:focus,.zt-field input:focus,.zt-field textarea:focus,.zt-field select:focus{border-color:var(--green);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--green) 30%,transparent)}
.nav{display:flex;align-items:center;gap:8px;font-weight:600}
.nav a{color:var(--ink);text-decoration:none;padding:8px 10px;border-radius:var(--r);white-space:nowrap}
.nav a:hover{background:var(--green-soft)}
.icon-btn{border:0;background:none;color:var(--ink);width:38px;height:38px;border-radius:var(--r);cursor:pointer;display:grid;place-items:center}
.icon-btn:hover{background:var(--green-soft)}
.results{position:absolute;left:0;right:0;top:calc(100% + 6px);margin:0;padding:6px;list-style:none;background:var(--surface);border:1.5px solid var(--ink);border-radius:var(--r);max-height:70vh;overflow:auto;z-index:60}
.results a{display:block;padding:8px 10px;border-radius:4px;color:var(--ink);text-decoration:none}
.results a small{display:block;color:var(--muted)}
.results [aria-selected=true] a,.results a:hover{background:var(--green-soft)}
.announce{background:var(--ink);color:var(--paper);text-align:center;padding:8px 16px;font-size:.92rem}
.announce a{color:var(--green)}

/* hero */
.hero{padding:56px 0 40px}
.hero-grid{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center}
.hero h1{font-size:clamp(2.1rem,5.2vw,3.7rem);letter-spacing:-.04em;max-width:15ch;margin-bottom:.35em}
.lead{font-size:1.15rem;color:var(--muted);max-width:60ch;margin:0 0 1.2em}
.hero-search{display:flex;gap:8px;max-width:560px}
.hero-search input{padding:13px 14px;font-size:1.05rem}
.hero-mark{display:block}
.page-h{font-size:clamp(1.8rem,4vw,2.6rem);margin-top:.4em}
.sec-h{font-size:1.35rem;margin:2.2em 0 .8em}
.sec-h a{color:inherit;text-decoration:none}
.sec-h a:hover{text-decoration:underline}

/* buttons */
.btn{font:inherit;font-weight:700;border:1.5px solid var(--ink);background:var(--surface);color:var(--ink);padding:9px 16px;border-radius:var(--r);cursor:pointer;text-decoration:none;display:inline-block;line-height:1.3}
.btn:hover{background:var(--green-soft)}
.btn-primary{background:var(--green);border-color:var(--green);color:#10241C}
.btn-primary:hover{background:color-mix(in srgb,var(--green) 85%,#fff)}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* grids and cards */
.grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.tcard,.cat{display:flex;flex-direction:column;gap:2px;height:100%;padding:14px 16px;background:var(--surface);border:1.5px solid var(--line);border-left:4px solid var(--green);border-radius:var(--r);color:var(--ink);text-decoration:none}
.tcard:hover,.cat:hover{border-color:var(--ink);border-left-color:var(--green)}
.tcard span,.cat span{color:var(--muted);font-size:.92rem}
.cats .cat{border-left-color:var(--ink)}
.empty{padding:24px;border:1.5px dashed var(--line);border-radius:var(--r);margin-top:24px}

/* breadcrumbs */
.crumbs{padding-top:18px;font-size:.9rem;color:var(--muted)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li+li::before{content:"/";margin-right:6px;opacity:.6}
.crumbs a{color:var(--muted)}

/* tool page */
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;align-items:start}
.tool-head h1{font-size:clamp(1.7rem,3.6vw,2.4rem);margin-top:.5em}
.tool-card{background:var(--surface);border:1.5px solid var(--ink);border-radius:var(--r);padding:20px;margin:16px 0;min-height:220px}
.skeleton{height:160px;border-radius:var(--r);background:linear-gradient(90deg,var(--line),transparent,var(--line)) 0 0/200% 100%;animation:sk 1.4s linear infinite;opacity:.6}
@keyframes sk{to{background-position:-200% 0}}
.side{position:sticky;top:84px;display:grid;gap:16px}
.side-box{background:var(--surface);border:1.5px solid var(--line);border-radius:var(--r);padding:16px}
.side-box ul,.site-footer ul{list-style:none;margin:0;padding:0}
.side-box li{padding:3px 0}

/* prose + faq */
.prose{max-width:72ch;margin:32px 0}
.prose h2{font-size:1.4rem;margin-top:1.8em}
.prose ol,.prose ul{padding-left:1.3em}
.faq details{border-bottom:1.5px solid var(--line);padding:10px 0}
.faq summary{cursor:pointer;font-weight:650}
.faq p{margin:.5em 0 0;color:var(--muted)}

/* footer */
.site-footer{background:var(--surface);margin-top:56px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;padding-top:32px;padding-bottom:16px}
.foot-h{font-size:.95rem;margin:0 0 10px}
.site-footer li{padding:2px 0}
.site-footer a:not(.brand){color:var(--muted)}
.fine{padding-bottom:28px;color:var(--muted);font-size:.9rem}

/* ads */
.ad{margin:16px auto;text-align:center;max-width:100%}
.ad[hidden]{display:none}
.ad-label{display:block;font-size:.7rem;color:var(--muted);margin-bottom:2px}
.ad iframe{border:0;max-width:100%;display:block;margin:0 auto}
.ad[data-ad-slot=sticky]{position:fixed;left:0;right:0;bottom:0;margin:0;z-index:70;background:var(--surface);border-top:1.5px solid var(--ink);padding:4px 0}
.ad-close{position:absolute;right:4px;top:-26px;font:inherit;border:1.5px solid var(--ink);background:var(--surface);color:var(--ink);border-radius:var(--r) var(--r) 0 0;padding:0 8px;cursor:pointer}

/* consent + toast */
.consent{position:fixed;left:16px;right:16px;bottom:16px;max-width:560px;margin:0 auto;background:var(--surface);border:1.5px solid var(--ink);border-radius:var(--r);padding:16px;z-index:90;display:grid;gap:12px}
.consent p{margin:0;font-size:.95rem}
.consent .row{display:flex;gap:8px;justify-content:flex-end}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:var(--r);z-index:95;font-weight:600}

/* tool kit: reuse inside tool.js */
.zt-field{display:grid;gap:6px;font-weight:650;margin-bottom:14px}
.zt-field textarea{font-family:var(--mono);font-weight:400;resize:vertical}
.zt-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:12px 0}
.zt-row>*{width:auto}
.zt-out{background:var(--paper);border:1.5px solid var(--line);border-radius:var(--r);padding:12px;margin:12px 0 0;white-space:pre-wrap;word-break:break-word;font-family:var(--mono);min-height:48px}
.zt-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin:12px 0}
.zt-stats div{border:1.5px solid var(--line);border-radius:var(--r);padding:10px;background:var(--paper)}
.zt-stats b{display:block;font-size:1.5rem;font-variant-numeric:tabular-nums}
.zt-drop{border:2px dashed var(--ink);border-radius:var(--r);padding:36px 16px;text-align:center;cursor:pointer;background:var(--paper)}
.zt-drop.over,.zt-drop:hover{background:var(--green-soft);border-color:var(--green-ink)}
.zt-error{color:var(--danger);font-weight:600}

@media (max-width:900px){
  .tool-layout{grid-template-columns:1fr}.side{position:static}
  .hero-grid{grid-template-columns:1fr}.hero-mark{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}.foot-grid>div:first-child{grid-column:1/-1}
}
@media (max-width:640px){
  .bar{gap:8px}.brand span{display:none}.nav a{display:none}
  .hero{padding:32px 0 24px}.hero-search{flex-direction:column}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}