/* HEXgenerator.online
   Layout: dark neon-hex hero (brand, nav, H1, answer-first lead) → tool card overlapping the hero edge
   → article (how-to + FAQ) beside related-tool cards → footer with full tool/language interlinking. */
:root{
  --bg:#f4f5fb; --surface:#ffffff; --sunken:#eceef7; --ink:#131c33; --muted:#535e7a; --line:#dde1ec;
  --accent:#6a00ff; --accent-ink:#ffffff; --accent-2:#00b8d9; --ok:#0f7d48; --warn:#a96200; --bad:#c42443;
  --hero-bg:#070b24; --hero-ink:#ffffff; --hero-muted:#c7cdea; --hero-line:rgba(255,255,255,.16);
  --f-display:"Lexend",ui-sans-serif,system-ui,sans-serif;
  --f-body:"Figtree",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --r:12px; --gutter-l:max(16px,env(safe-area-inset-left,0px)); --gutter-r:max(16px,env(safe-area-inset-right,0px));
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0b1020; --surface:#131a2c; --sunken:#0e1425; --ink:#e8ebf5; --muted:#9ba5bd; --line:#252f47;
  --accent:#a06bff; --accent-ink:#0b1020; --accent-2:#3dd6f0; --ok:#3fcd88; --warn:#f2a93f; --bad:#ff6f87; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0b1020; --surface:#131a2c; --sunken:#0e1425; --ink:#e8ebf5; --muted:#9ba5bd; --line:#252f47;
  --accent:#a06bff; --accent-ink:#0b1020; --accent-2:#3dd6f0; --ok:#3fcd88; --warn:#f2a93f; --bad:#ff6f87; color-scheme:dark}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55}
img{max-width:100%;height:auto}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--f-display);margin:0;text-wrap:balance;line-height:1.2}
p{margin:0}
a{color:inherit}
button,select,input{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent-2);outline-offset:2px;border-radius:6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px;top:8px;z-index:30;background:var(--surface);color:var(--ink);padding:10px 14px;border-radius:8px}
.skip:focus{left:16px}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.container{max-width:1180px;margin:0 auto;padding-left:var(--gutter-l);padding-right:var(--gutter-r)}

/* ---------- hero ---------- */
.hero{position:relative;isolation:isolate;background:var(--hero-bg);color:var(--hero-ink);overflow:hidden}
.hero-img{position:absolute;inset:0;z-index:-2}
.hero-img img{width:100%;height:100%;object-fit:cover;display:block}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(6,9,30,.78) 0%,rgba(6,9,30,.6) 45%,rgba(6,9,30,.92) 100%)}
.hero .container{padding-block:14px 76px;display:flex;flex-direction:column;gap:22px}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px 20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;min-height:44px}
.brand img{width:38px;height:auto}
.word{font-family:var(--f-display);font-size:21px;letter-spacing:-.01em;line-height:1;white-space:nowrap}
.word b{font-weight:700}.word span{font-weight:400}.word i{font-style:normal;color:#b98bff;font-weight:700}
.langs{display:flex;gap:2px;list-style:none;margin:0;padding:3px;border:1px solid var(--hero-line);border-radius:999px}
.langs a{display:grid;place-items:center;min-width:40px;min-height:36px;padding:0 8px;border-radius:999px;text-decoration:none;font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--hero-muted)}
.langs a:hover{color:var(--hero-ink);background:rgba(255,255,255,.08)}
.langs a[aria-current="true"]{background:var(--hero-ink);color:var(--hero-bg)}
.mainnav{overflow-x:auto;margin-inline:-4px;scrollbar-width:none}
.mainnav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0 4px}
.mainnav a{display:flex;align-items:center;min-height:44px;padding:0 14px;border-radius:10px;text-decoration:none;color:var(--hero-muted);font-weight:600;font-size:15px;white-space:nowrap;transition:background .15s,color .15s}
.mainnav a:hover{color:var(--hero-ink);background:rgba(255,255,255,.08)}
.mainnav a[aria-current="page"]{color:var(--hero-ink);background:rgba(255,255,255,.14);box-shadow:inset 0 -2px 0 #b98bff}
.crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0;padding:0;font-size:13.5px;color:var(--hero-muted)}
.crumbs li+li::before{content:"›";margin-right:6px;opacity:.7}
.crumbs a{text-decoration:none}.crumbs a:hover{text-decoration:underline}
.intro{max-width:780px;display:flex;flex-direction:column;gap:12px}
.intro h1{font-size:clamp(30px,5vw,52px);font-weight:700;letter-spacing:-.02em}
.intro .lead{font-size:clamp(16px,1.6vw,18px);color:var(--hero-muted);max-width:68ch}
.updated{font-size:13px;color:var(--hero-muted)}

/* ---------- tool ---------- */
.tool{position:relative;margin-top:-48px;display:flex;flex-direction:column;gap:16px}
.toolcard{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:16px;display:flex;flex-direction:column;gap:14px;box-shadow:0 18px 40px -24px rgba(10,14,40,.45)}
.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.field{display:flex;align-items:center;gap:6px;background:var(--sunken);border:1px solid var(--line);border-radius:999px;padding:0 6px 0 14px;font-size:14px;color:var(--muted);min-height:44px}
.field select{border:0;background:transparent;padding:8px 6px;font-weight:600;color:var(--ink);cursor:pointer}
.spacer{flex:1}
.btn{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:0 16px;min-height:44px;cursor:pointer;display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px;transition:border-color .15s,background .15s}
.btn:hover{border-color:var(--muted)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn.primary:hover{filter:brightness(1.08)}
kbd{font-family:var(--f-mono);font-size:11px;border:1px solid currentColor;border-radius:4px;padding:0 5px;opacity:.8}
.hintline{font-size:13px;color:var(--muted)}
svg.i{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}

.palette{display:flex;height:min(48vh,420px);min-height:300px;border-radius:14px;overflow:hidden}
.sw{flex:1;min-width:0;position:relative;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:6px;padding:14px 6px 18px;transition:flex .25s ease;cursor:pointer}
.sw.sel{flex:1.35}
.sw .hex{font-family:var(--f-mono);font-weight:700;font-size:clamp(14px,1.8vw,20px);letter-spacing:.02em;background:none;border:0;cursor:copy;padding:8px;border-radius:8px;min-height:44px}
.sw .meta{font-size:11.5px;font-family:var(--f-mono);opacity:.8;text-align:center}
.sw .tools{display:flex;gap:2px;opacity:.6;transition:opacity .15s}
.sw:hover .tools,.sw.sel .tools,.sw:focus-within .tools,.sw.locked .tools{opacity:1}
.sw .tools button,.sw .tools label{width:44px;height:44px;border-radius:10px;border:0;background:transparent;display:grid;place-items:center;cursor:pointer;color:inherit;position:relative}
.sw .tools button:hover,.sw .tools label:hover{background:rgba(127,127,127,.2)}
.sw .tools input[type=color]{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.sw .lockmark{position:absolute;top:12px;font-size:11px;font-family:var(--f-mono);letter-spacing:.08em;text-transform:uppercase;opacity:.9}
@media (max-width:640px){
  .palette{flex-direction:column;height:auto;min-height:0}
  .sw{flex-direction:row;justify-content:space-between;padding:6px 10px;min-height:64px}
  .sw.sel{flex:1}
  .sw .tools{opacity:1}
  .sw .lockmark{position:static;order:3}
  .sw .meta{display:none}
}

/* workbench */
.bench{background:var(--surface);border:1px solid var(--line);border-radius:20px}
.tabs{display:flex;gap:2px;padding:6px;border-bottom:1px solid var(--line);overflow-x:auto}
.tab{border:0;background:transparent;padding:0 14px;min-height:44px;border-radius:10px;cursor:pointer;color:var(--muted);font-weight:600;white-space:nowrap;font-size:14.5px}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{background:var(--sunken);color:var(--ink);box-shadow:inset 0 -2px 0 var(--accent)}
.panel{padding:20px;display:flex;flex-direction:column;gap:16px}
.panel h2{font-size:19px;font-weight:600}
.hint{color:var(--muted);font-size:14px;max-width:68ch}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.seg{display:inline-flex;background:var(--sunken);border-radius:12px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{border:0;background:transparent;padding:0 12px;min-height:40px;border-radius:9px;cursor:pointer;font-size:13.5px;font-weight:600;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
pre.code{margin:0;background:var(--sunken);border:1px solid var(--line);border-radius:var(--r);padding:16px;padding-right:96px;overflow-x:auto;font-family:var(--f-mono);font-size:13px;line-height:1.65;min-width:0}
.codebox{position:relative;min-width:0}
.codebox .btn{position:absolute;top:8px;right:8px;min-height:36px;padding:0 12px;font-size:12.5px}

.cgrid-wrap{overflow-x:auto}
table.cgrid{border-collapse:separate;border-spacing:4px;font-size:12px}
.cgrid th{font-family:var(--f-mono);font-weight:500;color:var(--muted);padding:4px;text-align:center;white-space:nowrap}
.cgrid th .dot{display:inline-block;width:12px;height:12px;border-radius:3px;vertical-align:-2px;margin-right:4px;border:1px solid var(--line)}
.cgrid td{width:96px;min-width:84px;height:66px;border-radius:8px;text-align:center;vertical-align:middle;padding:4px}
.cgrid td .aa{font-family:var(--f-display);font-size:18px;font-weight:600;line-height:1.1}
.cgrid td .r{font-family:var(--f-mono);font-size:11px}
.pill{display:inline-block;font-size:10px;font-weight:700;letter-spacing:.06em;padding:1px 6px;border-radius:999px;background:var(--surface);color:var(--ink);margin-top:2px}
.pill.fail{background:transparent;border:1px solid currentColor;color:inherit;opacity:.75}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.checker{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:12px}
.ck{border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.ck .demo{padding:18px}
.ck .demo-h{font-family:var(--f-display);font-size:22px;font-weight:600}
.ck .demo p+p{margin-top:6px;font-size:14px}
.ck .res{display:flex;gap:8px;flex-wrap:wrap;padding:10px 14px;background:var(--sunken);font-size:13px;align-items:center}
.ck select{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:6px;min-height:36px;font-family:var(--f-mono);font-size:12px}
.ok{color:var(--ok);font-weight:700}.no{color:var(--bad);font-weight:700}

.gprev{height:200px;border-radius:var(--r);border:1px solid var(--line)}
.stops{display:flex;gap:8px;flex-wrap:wrap}
.stop{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;padding:0 12px 0 6px;min-height:44px;cursor:pointer;font-family:var(--f-mono);font-size:12.5px;background:var(--surface)}
.stop .dot{width:24px;height:24px;border-radius:50%;border:1px solid rgba(127,127,127,.35)}
.stop input,input[type=range]{accent-color:var(--accent)}
input[type=range]{width:180px;min-height:32px}
.rangeLbl{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}

.sim{display:grid;gap:12px}
.simrow{display:grid;grid-template-columns:190px minmax(0,1fr);gap:12px;align-items:center}
.simrow .lbl b{display:block;font-size:14.5px}.simrow .lbl span{font-size:12.5px;color:var(--muted)}
.strip{display:flex;height:54px;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.strip div{flex:1;min-width:0;display:flex;align-items:flex-end;justify-content:center;padding-bottom:4px;font-family:var(--f-mono);font-size:11px;overflow:hidden}
.warnbox{border-left:3px solid var(--warn);background:var(--sunken);padding:12px 14px;border-radius:0 10px 10px 0;font-size:14px}
.warnbox.good{border-color:var(--ok)}
@media (max-width:560px){.simrow{grid-template-columns:1fr;gap:6px}.strip div{font-size:0}}

.shades{display:grid;grid-template-columns:repeat(11,minmax(0,1fr));border-radius:var(--r);overflow:hidden;border:1px solid var(--line)}
.shades button{border:0;height:86px;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;padding:6px 2px;cursor:copy;font-family:var(--f-mono);font-size:10.5px;gap:2px;min-width:0;overflow:hidden}
.shades button b{font-size:12px}
@media (max-width:760px){.shades{grid-template-columns:repeat(4,minmax(0,1fr))}}

.saved{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.sv{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--surface)}
.sv .bar{display:flex;height:56px;width:100%;border:0;padding:0;cursor:pointer}
.sv .bar span{flex:1}
.sv .foot{display:flex;justify-content:space-between;align-items:center;padding:4px 6px 4px 12px;font-size:12.5px;color:var(--muted)}
.sv .foot button{border:0;background:none;color:var(--muted);cursor:pointer;font-size:12.5px;min-height:36px;padding:0 8px;border-radius:6px}
.sv .foot button:hover{color:var(--bad)}
.empty{border:1px dashed var(--line);border-radius:var(--r);padding:22px;color:var(--muted);font-size:14px;text-align:center}

/* ---------- article + related ---------- */
.content{display:grid;gap:28px;padding-block:44px 8px}
@media (min-width:960px){.content{grid-template-columns:minmax(0,1fr) 340px;align-items:start}}
.article{display:flex;flex-direction:column;gap:30px;min-width:0}
.article section{display:flex;flex-direction:column;gap:14px}
.article h2{font-size:clamp(22px,2.6vw,28px);font-weight:600}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:10px;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:36px minmax(0,1fr);gap:12px;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;max-width:72ch}
.steps li::before{content:counter(s);display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--sunken);font-family:var(--f-display);font-weight:600;color:var(--accent)}
.faq{display:grid;gap:18px}
.faq article{border-top:1px solid var(--line);padding-top:16px;max-width:72ch}
.faq h3{font-size:18px;font-weight:600;margin-bottom:6px}
.faq p{color:var(--ink)}
.related{display:flex;flex-direction:column;gap:12px}
.related h2{font-size:18px;font-weight:600}
.rcard{display:grid;grid-template-columns:112px minmax(0,1fr);gap:12px;align-items:center;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:8px;transition:border-color .15s,transform .15s}
.rcard:hover{border-color:var(--accent)}
.rcard img{width:112px;height:72px;object-fit:cover;border-radius:9px;display:block;background:var(--hero-bg)}
.rcard b{display:block;font-family:var(--f-display);font-weight:600;font-size:15px}
.rcard span{display:block;font-size:13px;color:var(--muted);line-height:1.4}
.prose{display:flex;flex-direction:column;gap:22px;max-width:72ch;padding-block:44px 8px}
.prose h2{font-size:22px;font-weight:600;margin-bottom:6px}

/* ---------- footer ---------- */
.site-foot{margin-top:56px;border-top:1px solid var(--line);background:var(--surface)}
.site-foot .container{padding-block:32px calc(28px + env(safe-area-inset-bottom,0px));display:grid;gap:28px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.site-foot h2{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;font-family:var(--f-body)}
.site-foot ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.site-foot a{display:inline-flex;align-items:center;min-height:36px;text-decoration:none;font-size:14.5px}
.site-foot a:hover{color:var(--accent);text-decoration:underline}
.site-foot .about{font-size:14px;color:var(--muted);max-width:40ch;margin-top:10px}
.site-foot .brandline{font-family:var(--f-display);font-size:18px}
.site-foot .brandline b{font-weight:700}.site-foot .brandline i{font-style:normal;color:var(--accent);font-weight:700}

.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:999px;font-size:14px;font-weight:600;opacity:0;transition:.2s;pointer-events:none;z-index:40}
.toast.on{opacity:1;transform:translate(-50%,0)}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}}