/* UTILITY_CORE design-system v2.2.0 — static-first, mobile-first, no framework */
:root{
  --primary:#2563eb; --primary-ink:#ffffff; --secondary:#0f172a;
  --surface:#ffffff; --surface-2:#f1f5f9; --text:#0f172a; --muted:#5b6472;
  --border:#e2e8f0; --accent:#f59e0b; --danger:#dc2626; --success:#16a34a;
  --radius:12px; --max:1120px; --ad-bg:#f8fafc;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,"Helvetica Neue",Arial,sans-serif;
}
[data-theme="dark"]{
  --surface:#0f172a; --surface-2:#1e293b; --text:#f1f5f9; --muted:#94a3b8;
  --border:#334155; --ad-bg:#1e293b;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
::selection{background:var(--primary);color:var(--primary-ink,#fff)}
body{margin:0;font-family:var(--font);background:var(--surface);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3{text-wrap:balance;letter-spacing:-.015em}
h1{font-size:clamp(1.9rem,4.5vw,2.9rem);line-height:1.12}
h2{font-size:clamp(1.25rem,2.6vw,1.6rem);margin-top:1.6em}
a{color:var(--link,var(--primary))}
[data-theme="dark"] a{color:color-mix(in srgb,var(--primary) 62%,#fff)}
:focus-visible{outline:3px solid var(--focus,#92400e);outline-offset:2px}
[data-theme="dark"]{--focus:#f59e0b}
::placeholder{color:var(--muted);opacity:1}
.result .big{letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.skip{position:absolute;left:-9999px}.skip:focus{left:8px;top:8px;background:var(--accent);color:#000;padding:8px 12px;z-index:99;border-radius:8px}
header.top{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:1px solid var(--border)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
.bar{display:flex;gap:12px;align-items:center;padding:12px 0;flex-wrap:wrap}
.logo{font-weight:800;font-size:1.25rem;text-decoration:none;color:var(--text);display:flex;align-items:center;gap:8px}
.logo .mark{width:32px;height:32px;border-radius:9px;background:var(--primary);color:var(--primary-ink,#fff);display:inline-flex;align-items:center;justify-content:center;font-weight:900}
nav.main{display:flex;gap:4px;flex-wrap:wrap}
nav.main a{text-decoration:none;color:var(--text);padding:8px 12px;border-radius:8px}
nav.main a:hover,nav.main a[aria-current="page"]{background:var(--surface-2)}
.searchbox{margin-left:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
@media(max-width:820px){
  .bar{row-gap:8px}
  .searchbox{margin-left:0;flex:1 1 100%;order:3}
  .searchbox input[type="search"]{flex:1;min-width:0}
  nav.main{order:2;flex:1 1 100%;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}
  nav.main::-webkit-scrollbar{display:none}
  nav.main a{flex:none}
}
input[type="search"],input[type="text"],input[type="number"],input[type="date"],input[type="color"],select,textarea{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:12px;font-size:1rem;min-height:48px}
textarea{width:100%;min-height:140px;font-family:ui-monospace,Consolas,monospace}
button,.btn{background:var(--primary);color:var(--primary-ink,#fff);border:0;border-radius:10px;padding:12px 18px;font-size:1rem;min-height:48px;cursor:pointer;font-weight:700}
button.secondary{background:var(--surface-2);color:var(--text);border:1px solid var(--border)}
button.ghost{background:transparent;color:var(--text);border:1px dashed var(--border)}
button:disabled{opacity:.5;cursor:not-allowed}
.hero{padding:36px 0 12px;text-align:left;position:relative}
.hero-aurora{position:relative;overflow:hidden;border-radius:18px;padding:clamp(24px,4vw,44px);margin:14px 0;background:radial-gradient(70% 120% at 12% 0%,color-mix(in srgb,var(--primary) 26%,transparent) 0,transparent 60%),radial-gradient(55% 100% at 95% 15%,color-mix(in srgb,var(--primary) 18%,transparent) 0,transparent 55%),var(--surface-2);border:1px solid var(--border)}
@media (prefers-reduced-motion:no-preference){.hero-aurora::after{content:"";position:absolute;inset:-40%;background:radial-gradient(30% 30% at 60% 40%,color-mix(in srgb,var(--primary) 14%,transparent),transparent 70%);animation:drift 14s ease-in-out infinite alternate;pointer-events:none}@keyframes drift{from{transform:translate(-4%,-2%)}to{transform:translate(4%,3%)}}}
.hero h1{font-size:clamp(1.8rem,4.5vw,2.8rem);line-height:1.15;margin:.2em 0}
.hero p.lead{font-size:1.1rem;color:var(--muted);max-width:62ch}
.badges{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.badge{background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:6px 12px;font-size:.85rem}
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:20px;padding:12px 0 40px}
.layout>*{min-width:0}
.grid>*{min-width:0}
.result pre,#out pre,.card pre{white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere}
@media(min-width:1024px){.layout{grid-template-columns:minmax(0,1fr) 300px}.rail{position:sticky;top:76px;align-self:start}}
.ad{background:var(--ad-bg) repeating-linear-gradient(-45deg,transparent 0 14px,rgba(127,140,160,.07) 14px 15px);border:1px solid var(--border);border-radius:10px;min-height:90px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.85rem;margin:16px 0;overflow:hidden;text-align:center;padding:12px}
.ad[data-variant="top"]{min-height:100px}
.ad[data-variant="sidebar"]{min-height:280px}
/* responsive ad unit: sidebar rail exists only on desktop — never request or
   show it on mobile (policy-safe responsive implementation, zero waste) */
@media(max-width:1023px){.ad[data-variant="sidebar"]{display:none}}
/* accidental-click distance: results/download buttons always sit well above */
#out+.ad[data-variant="in-content"]{margin-top:28px}
.ad[data-variant="in-content"]{min-height:120px}
.ad[data-variant="footer"]{min-height:100px}
.ad .lbl{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em}
/* dropdowns (language/theme): button + listbox panel */
.dd{position:relative;display:inline-block}
.dd>button{display:inline-flex;align-items:center;gap:6px}
.dd .panel{position:absolute;right:0;top:calc(100% + 6px);min-width:190px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 12px 32px rgba(0,0,0,.18);padding:6px;z-index:80}
.dd .panel [role="option"]{display:flex;align-items:center;gap:8px;width:100%;text-align:left;background:transparent;color:var(--text);border:0;border-radius:8px;padding:12px;font-size:1rem;min-height:44px;font-weight:500}
.dd .panel [role="option"]:hover{background:var(--surface-2)}
.dd .panel [role="option"][aria-selected="true"]{background:var(--surface-2);font-weight:800}
/* privacy: unmissable ON state + persistent badge */
#privBtn.on{background:#15803d;color:#fff;border-color:#15803d}
#privBadge{position:fixed;left:12px;bottom:12px;z-index:70;background:#15803d;color:#fff;font-size:.8rem;font-weight:700;border-radius:999px;padding:8px 14px;box-shadow:0 6px 20px rgba(0,0,0,.25);display:none}
body[data-priv="1"] #privBadge{display:block}
.grid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:640px){.grid.cols-2{grid-template-columns:1fr 1fr}.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.grid.cols-3{grid-template-columns:repeat(3,1fr)}.grid.cols-4{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;transition:transform .16s ease,box-shadow .16s ease}
@media (hover:hover){.card:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.10)}}
[data-theme="dark"] .card{box-shadow:0 1px 0 rgba(255,255,255,.04) inset}
button:active{transform:scale(.98)}
.card h3{margin:.2em 0;font-size:1.05rem}
.card p{color:var(--muted);font-size:.95rem;margin:.3em 0 .8em}
.quicknav{position:sticky;top:60px;z-index:40;display:flex;gap:8px;overflow-x:auto;padding:10px 2px;margin:0;max-width:100%;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(8px);scrollbar-width:none}
.quicknav::-webkit-scrollbar{display:none}
.quicknav a{flex:none;text-decoration:none;color:var(--text);border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:8px 14px;font-size:.9rem;font-weight:600}
/* mobile action bar (tool view) */
#actionbar{display:none}
@media(max-width:768px){
  #actionbar.on{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(10px);border-top:1px solid var(--border)}
  #actionbar button{flex:1}
  body.tool-open{padding-bottom:76px}
}
/* before/after compare slider */
.ba-wrap{position:relative;border:1px solid var(--border);border-radius:10px;overflow:hidden;max-width:100%;background:#000}
.ba-wrap img{display:block;width:100%;height:auto}
.ba-after{position:absolute;inset:0;overflow:hidden}
.ba-after img{width:100%;height:100%;object-fit:cover}
.ba-handle{position:absolute;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 8px rgba(0,0,0,.6)}
.ba-wrap input[type="range"]{position:absolute;inset:0;width:100%;opacity:0;cursor:ew-resize;min-height:0}
.ba-tag{position:absolute;top:8px;font-size:.72rem;font-weight:800;background:rgba(0,0,0,.65);color:#fff;border-radius:6px;padding:2px 8px}
.result{border-left:4px solid var(--primary)}
.tool-meta{font-size:.8rem;color:var(--muted)}
#toolView{scroll-margin-top:84px}
#homeView{scroll-margin-top:84px}
.kbd{background:var(--surface-2);border:1px solid var(--border);border-bottom-width:2px;border-radius:6px;padding:1px 7px;font-family:ui-monospace,monospace;font-size:.85em}
button:not(.secondary):not(.ghost) .kbd,.btn:not(.secondary):not(.ghost) .kbd{background:transparent;border:1px solid currentColor;color:inherit}
.drop{border:2px dashed var(--border);border-radius:var(--radius);padding:28px;text-align:center;background:var(--surface-2);width:100%}
.drop.drag{border-color:var(--primary);background:#eff6ff}
.progress{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden;border:1px solid var(--border)}
.progress>i{display:block;height:100%;background:var(--primary);width:0%;transition:width .25s ease}
[data-theme="dark"] .progress>i{background:color-mix(in srgb,var(--primary) 62%,#fff)}
.result{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-top:12px}
.result .big{font-size:1.6rem;font-weight:800;word-break:break-word;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
table.data{width:100%;border-collapse:collapse;font-size:.95rem}
table.data th,table.data td{border:1px solid var(--border);padding:8px;text-align:right}
table.data th:first-child,table.data td:first-child{text-align:left}
canvas.chart{width:100%;height:220px;background:var(--surface);border:1px solid var(--border);border-radius:10px}
.faq details{border:1px solid var(--border);border-radius:10px;margin:8px 0;padding:10px 14px;background:var(--surface)}
.faq summary{cursor:pointer;font-weight:700}
footer.site{border-top:1px solid var(--border);padding:28px 0;margin-top:24px;color:var(--muted);font-size:.92rem}
footer.site nav{display:flex;gap:14px;flex-wrap:wrap;margin:8px 0}
.toast{position:static;transform:none;background:var(--secondary);color:#fff;padding:10px 14px;border-radius:12px;z-index:auto;display:flex;gap:10px;align-items:center;max-width:100%;box-shadow:0 8px 24px rgba(0,0,0,.28)}
.toasts{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);z-index:99;display:flex;flex-direction:column;gap:8px;width:max-content;max-width:calc(100vw - 24px)}
.toasts .toast>span{flex:1;min-width:0;overflow-wrap:anywhere}
.toast-act,.toast-x{flex:none;min-height:36px;padding:6px 10px;font-size:.85rem}
.toast-x{border-color:transparent;color:#fff}
.toast-err{border-left:4px solid var(--danger)}
.toast-warn{border-left:4px solid var(--accent)}
.toast-ok{border-left:4px solid var(--success)}
/* skeletons (aria-busy regions) */
.skel{position:relative;overflow:hidden;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;min-height:58px;margin:8px 0}
.skel::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,transparent 20%,rgba(148,163,184,.28) 50%,transparent 80%);animation:sksh 1.2s ease-in-out infinite}
@keyframes sksh{from{transform:translateX(-100%)}to{transform:translateX(100%)}}
body[data-savedata="1"] .skel::after{display:none}
/* result flash on fresh (non-live) runs */
@keyframes outflash{0%{box-shadow:0 0 0 3px var(--primary)}100%{box-shadow:0 0 0 0 transparent}}
#out.flash>.result:first-child{animation:outflash 1.1s ease-out}
/* inline field errors + char counts + dirty dot */
.ferr{color:var(--danger);font-size:.82rem;margin:4px 0 0;font-weight:600}
input[aria-invalid="true"],select[aria-invalid="true"],textarea[aria-invalid="true"]{border-color:var(--danger)}
.ccount{font-size:.75rem;color:var(--muted);text-align:right;margin:2px 0 0}
#resetBtn.dirty{border-style:solid;border-color:var(--accent)}
/* desktop sticky run-bar (mobile keeps #actionbar) */
#runbar{display:none}
@media(min-width:769px){
  #runbar.on{display:flex;position:fixed;right:16px;bottom:16px;z-index:60;gap:8px;align-items:center;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:14px;padding:8px;box-shadow:0 10px 28px rgba(0,0,0,.16)}
  #runbar button{min-height:44px;padding:10px 14px}
}
/* back to top */
#backTop{display:none;position:fixed;left:12px;bottom:64px;z-index:60;min-height:44px;width:44px;padding:0;border-radius:50%;font-size:1.1rem}
#backTop.on{display:block}
/* history v2 */
.hist-item{display:flex;gap:8px;align-items:center;flex-wrap:wrap;border:1px solid var(--border);border-radius:10px;padding:8px 12px;margin:8px 0;background:var(--surface)}
.hist-item .grow{flex:1;min-width:140px}
.hist-item time{font-size:.75rem;color:var(--muted);white-space:nowrap}
.hist-item .sum{font-size:.82rem;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}
/* v2.2 — sound toggle off state */
#soundBtn[aria-pressed="false"]{opacity:.55}
/* v2.2 — coachmark overlay (first-run, dismissible, no CLS: fixed overlay) */
#coachRoot .coach-veil{position:fixed;inset:0;z-index:110;background:rgba(2,6,23,.55);display:flex;align-items:center;justify-content:center;padding:20px}
#coachRoot .coach-card{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:14px;padding:20px;max-width:420px;width:100%;box-shadow:0 18px 50px rgba(0,0,0,.3)}
#coachRoot .coach-card ol{margin:10px 0 14px;padding-left:20px}
#coachRoot .coach-card label{display:flex;gap:8px;align-items:center;font-size:.85rem;color:var(--muted);margin:8px 0}
/* v2.2 — timer controls: 44px+ tap targets, done pulse */
#out [data-role="controls"] button{min-height:44px}
@keyframes donepulse{0%{box-shadow:0 0 0 0 var(--success)}100%{box-shadow:0 0 0 14px transparent}}
#out .timer-done{animation:donepulse .9s ease-out 2;border-radius:10px}
/* v2.2 — animated decision wheel */
.wheel-wrap{display:flex;flex-direction:column;gap:10px;align-items:center}
canvas.wheel-canvas{max-width:100%;height:auto;border:1px solid var(--border);border-radius:50%;background:var(--surface)}
.wheel-legend{font-size:.85rem;color:var(--muted);max-width:100%;overflow-wrap:anywhere}
/* v2.2 — illustrated empty states */
.empty-illu{display:flex;gap:12px;align-items:center;border:1px dashed var(--border);border-radius:12px;padding:14px;margin:10px 0;color:var(--muted)}
.empty-illu svg{flex:none}
/* v2.2 — guides reading progress (static pages) */
#tocProg{position:fixed;top:0;left:0;height:3px;width:0%;z-index:90;background:var(--primary)}
.sr{position:fixed;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.preview{display:flex;gap:12px;flex-wrap:wrap}
.preview img,.preview video,.preview canvas{max-width:100%;height:auto;border:1px solid var(--border);border-radius:10px;background:#000}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.chip{border:1px solid var(--border);border-radius:999px;padding:6px 10px;background:var(--surface);cursor:pointer}
.chip[aria-pressed="true"]{background:var(--primary);color:#fff;border-color:var(--primary)}
.notice{border-left:4px solid var(--success);background:var(--surface-2);padding:10px 14px;border-radius:0 10px 10px 0;margin:12px 0}
.warn{border-left-color:var(--accent)}
.err{border-left-color:var(--danger)}
/* QR + barcode renders */
[data-qrbox] svg{max-width:100%;height:auto;background:#fff;border:1px solid var(--border);border-radius:10px}
.ean-bars{display:block;max-width:100%;height:auto;background:#fff;padding:12px;border:1px solid var(--border);border-radius:10px}
/* tool H1 focus target (a11y, no outline noise for mouse) */
#toolView h1:focus{outline:none}
#toolView h1:focus-visible{outline:3px solid var(--focus,#92400e);outline-offset:4px;border-radius:4px}
/* Save-Data: kill decorative animation, keep everything functional */
body[data-savedata="1"] .hero-aurora::after{display:none!important}
/* Print: result only — no nav, ads, toolbars or inputs */
@media print{
  header.site,nav.breadcrumb,#quickNav,#quickChips,#actionbar,#runbar,#backTop,.toasts,.skel,.toolbar,.ad,footer.site,#homeView form,#q,#results,.drop,.faq details,button,#histSec{display:none!important}
  body{background:#fff;color:#000}
  .result,.card{break-inside:avoid;border:1px solid #999;background:#fff}
  #toolView h1{font-size:1.4rem}
  a{color:#000;text-decoration:none}
}