/* ZapToolbox — one stylesheet for every page. Mobile-first, no frameworks. */
:root{
  --bg:#f7f7f4; --card:#ffffff; --ink:#15171a; --ink-soft:#5b6068; --line:#e6e4dd;
  --zap:#f5a50b; --zap-deep:#d98a00; --zap-soft:#fff4dc; --accent:#1f6feb;
  --ok:#16803c; --bad:#c62828; --radius:14px; --shadow:0 1px 2px rgba(20,20,20,.05),0 6px 20px rgba(20,20,20,.05);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",Arial,sans-serif;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--font)}
img,svg,canvas{max-width:100%}
a{color:var(--accent)}
h1,h2,h3{line-height:1.25;margin:0 0 .5em}
h1{font-size:clamp(26px,4.5vw,38px);letter-spacing:-.01em}
h2{font-size:clamp(20px,3vw,26px)}
h3{font-size:18px}
p{margin:0 0 1em}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}

/* header */
.top{background:var(--ink);color:#fff;position:sticky;top:0;z-index:20}
.top .wrap{display:flex;align-items:center;gap:16px;height:60px}
.brand{display:flex;align-items:center;gap:8px;color:#fff;text-decoration:none;font-weight:800;font-size:20px;letter-spacing:-.01em}
.brand svg{width:26px;height:26px}
.brand b{color:var(--zap)}
.top nav{margin-left:auto;display:flex;gap:4px}
.top nav a{color:#d7dbe0;text-decoration:none;font-size:14px;padding:8px 10px;border-radius:8px}
.top nav a:hover{background:rgba(255,255,255,.08);color:#fff}

/* breadcrumbs */
.crumbs{font-size:13px;color:var(--ink-soft);margin:18px 0 6px}
.crumbs a{color:var(--ink-soft);text-decoration:none}
.crumbs a:hover{text-decoration:underline}

/* home hero */
.hero{padding:42px 0 18px;text-align:center}
.hero p{color:var(--ink-soft);font-size:18px;max-width:640px;margin:0 auto 22px}
.search{max-width:560px;margin:0 auto;position:relative}
.search input{width:100%;padding:14px 16px 14px 46px;border-radius:999px;border:1px solid var(--line);font-size:16px;background:#fff;box-shadow:var(--shadow)}
.search svg{position:absolute;left:16px;top:50%;transform:translateY(-50%);width:20px;color:var(--ink-soft)}

/* tool grid */
.cat{margin:34px 0 10px;font-size:15px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-soft)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.tile{display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.tile:hover{transform:translateY(-2px);border-color:var(--zap)}
.tile .ico{flex:none;width:40px;height:40px;border-radius:10px;background:var(--zap-soft);display:grid;place-items:center;font-size:20px}
.tile strong{display:block;font-size:16px;margin-bottom:2px}
.tile span{font-size:13.5px;color:var(--ink-soft);line-height:1.45}
.tile[hidden]{display:none}

/* tool page */
.tool-head{margin:6px 0 18px}
.tool-head p{color:var(--ink-soft);font-size:17px;margin:0}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(16px,3vw,26px);box-shadow:var(--shadow);margin-bottom:22px}
.row{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-bottom:14px}
.row > *{flex:1 1 160px;min-width:0}
label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
input[type=text],input[type=number],input[type=email],input[type=tel],input[type=date],input[type=url],input[type=password],select,textarea{
  width:100%;padding:11px 12px;border:1px solid #cfccc3;border-radius:10px;font:inherit;font-size:16px;background:#fff;color:var(--ink)}
textarea{min-height:170px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--zap);outline-offset:1px;border-color:var(--zap)}
input[type=range]{width:100%}
.check{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:500;margin:0}
.check input{width:18px;height:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 22px;border:0;border-radius:10px;background:var(--zap);color:#1b1300;font:700 15px/1 var(--font);cursor:pointer;text-decoration:none}
.btn:hover{background:var(--zap-deep)}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid #cfccc3}
.btn.ghost:hover{border-color:var(--ink)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.drop{border:2px dashed #cfccc3;border-radius:var(--radius);padding:34px 16px;text-align:center;background:#fcfbf8;cursor:pointer;transition:border-color .15s,background .15s}
.drop:hover,.drop.over{border-color:var(--zap);background:var(--zap-soft)}
.drop strong{display:block;font-size:17px;margin-bottom:4px}
.drop span{color:var(--ink-soft);font-size:14px}
.drop input{display:none}
.result{margin-top:18px}
.stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:16px}
.stat div{background:#fbfaf7;border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.stat small{display:block;color:var(--ink-soft);font-size:13px}
.stat b{font-size:22px}
.big{font-size:clamp(26px,5vw,40px);font-weight:800;margin:.2em 0}
.note{font-size:14px;color:var(--ink-soft)}
.ok{color:var(--ok)} .bad{color:var(--bad)}
.preview{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-top:14px}
.preview figure{margin:0;background:#fbfaf7;border:1px solid var(--line);border-radius:10px;padding:8px;text-align:center;font-size:12px;color:var(--ink-soft);word-break:break-all}
.preview img{display:block;max-height:140px;margin:0 auto 6px;object-fit:contain}
.qr-out{display:grid;place-items:center;padding:16px;background:#fff;border:1px solid var(--line);border-radius:12px}
.qr-out img,.qr-out canvas{image-rendering:pixelated}
table.tbl{width:100%;border-collapse:collapse;font-size:15px}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left}
.tbl th{font-size:13px;color:var(--ink-soft);font-weight:600}
.tbl td.num,.tbl th.num{text-align:right}
.scroll-x{overflow-x:auto}

/* ad slots: hidden until AdSense is set up (see README) */
.ad-slot{display:none;margin:18px 0;min-height:90px;text-align:center}
body.ads-on .ad-slot{display:block}

/* article content */
.content{max-width:760px}
.content h2{margin-top:1.6em}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin-bottom:10px}
.faq summary{font-weight:600;cursor:pointer}
.faq details p{margin:.6em 0 0;color:var(--ink-soft)}
.related{margin:30px 0}

/* footer */
.foot{margin-top:50px;background:#eceae3;padding:30px 0;font-size:14px;color:var(--ink-soft)}
.foot .wrap{display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between;align-items:center}
.foot nav{display:flex;flex-wrap:wrap;gap:14px}
.foot a{color:var(--ink-soft)}

@media (max-width:640px){
  .top nav a.hide-sm{display:none}
  .btn{width:100%}
  .btns .btn{flex:1 1 140px}
}
@media print{
  .top,.foot,.crumbs,.tool-head,.content,.related,.no-print,.ad-slot{display:none!important}
  body{background:#fff}
  .panel{border:0;box-shadow:none;padding:0}
}