/* ============================================================
   TOOLZEN — design tokens
   Palette: cool paper + ink + cobalt/yellow/coral accents
   Type: Space Grotesk (display) / Inter (body) / JetBrains Mono (data)
   Signature: QR-module grid motif, thick badge borders, bento cards
   ============================================================ */
:root{
  --paper:#F5F5F1;
  --paper-raised:#FFFFFF;
  --ink:#16181D;
  --ink-soft:#4B4E57;
  --ink-faint:#8B8D94;
  --line:#16181D;
  --line-soft:#DEDCD3;

  --cobalt:#3454F4;
  --cobalt-ink:#1C2E9E;
  --yellow:#FFC531;
  --coral:#FF5C6C;
  --mint:#26C485;

  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'JetBrains Mono', monospace;

  --radius-s:8px;
  --radius-m:14px;
  --radius-l:22px;
  --border-w:2.5px;
  --shadow-block:5px 5px 0 var(--ink);
  --shadow-block-sm:3px 3px 0 var(--ink);
}
[data-theme="dark"]{
  --paper:#151318;
  --paper-raised:#1F1D24;
  --ink:#F3F1EC;
  --ink-soft:#C9C6D0;
  --ink-faint:#8B8892;
  --line:#F3F1EC;
  --line-soft:#332F3A;
  --shadow-block:5px 5px 0 var(--ink);
  --shadow-block-sm:3px 3px 0 var(--ink);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font-body);font-size:16px;line-height:1.55;
  -webkit-font-smoothing:antialiased;
  transition:background .2s ease, color .2s ease;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.container{max-width:1120px;margin:0 auto;padding:0 24px;}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.08;margin:0 0 .5em;letter-spacing:-.01em;}
h1{font-size:clamp(34px,5.5vw,58px);}
h2{font-size:clamp(22px,3vw,30px);}
h3{font-size:19px;}
p{margin:0 0 1em;color:var(--ink-soft);}
:focus-visible{outline:3px solid var(--cobalt);outline-offset:2px;}
@media (prefers-reduced-motion: reduce){ *{animation:none!important;transition:none!important;} }

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--paper);border-bottom:var(--border-w) solid var(--line);}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;gap:20px;}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:21px;}
.logo-badge{
  width:38px;height:38px;border-radius:var(--radius-s);background:var(--ink);
  display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);gap:2px;padding:6px;
  border:var(--border-w) solid var(--line);
}
.logo-badge span{background:var(--yellow);border-radius:1px;}
.logo-badge span:nth-child(2),.logo-badge span:nth-child(4),.logo-badge span:nth-child(6),.logo-badge span:nth-child(8){background:transparent;}
.logo small{display:block;font-family:var(--font-body);font-weight:600;font-size:10px;letter-spacing:.12em;color:var(--ink-faint);text-transform:uppercase;margin-top:1px;}
.main-nav{display:flex;gap:26px;font-weight:600;font-size:14.5px;}
.main-nav a{padding:6px 2px;border-bottom:2.5px solid transparent;}
.main-nav a:hover{border-color:var(--cobalt);}
.header-actions{display:flex;align-items:center;gap:10px;}
.icon-btn{
  width:40px;height:40px;border-radius:var(--radius-s);border:var(--border-w) solid var(--line);
  background:var(--paper-raised);cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;
  transition:transform .12s ease;
}
.icon-btn:hover{transform:translate(-2px,-2px);box-shadow:var(--shadow-block-sm);}
.icon-btn.lang-btn{width:auto;padding:0 12px;font-family:var(--font-mono);font-weight:700;font-size:12.5px;}
.nav-toggle{display:none;}

/* language switcher */
.lang-switch{position:relative;}
.lang-menu{
  position:absolute;top:calc(100% + 10px);right:0;background:var(--paper-raised);border:var(--border-w) solid var(--line);
  border-radius:var(--radius-m);box-shadow:var(--shadow-block);padding:6px;min-width:190px;
  opacity:0;transform:translateY(-6px);pointer-events:none;transition:all .15s ease;z-index:60;
}
.lang-menu.open{opacity:1;transform:translateY(0);pointer-events:auto;}
.lang-menu a{display:block;font-size:13.5px;font-weight:500;padding:9px 10px;border-radius:var(--radius-s);}
.lang-menu a:hover{background:var(--paper);}
.lang-menu a.active{color:var(--cobalt);font-weight:700;}

@media (max-width:860px){
  .main-nav{position:fixed;top:73px;left:0;right:0;background:var(--paper);border-bottom:var(--border-w) solid var(--line);
    flex-direction:column;padding:16px 24px;gap:4px;transform:translateY(-120%);transition:transform .2s ease;z-index:40;}
  .main-nav.open{transform:translateY(0);}
  .main-nav a{padding:12px 4px;border-bottom:1px solid var(--line-soft);width:100%;}
  .nav-toggle{display:flex;}
}

/* ---------- hero ---------- */
.hero{padding:64px 0 40px;position:relative;overflow:hidden;}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;}}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12.5px;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;color:var(--cobalt-ink);background:#E4E9FF;border:1.5px solid var(--cobalt);
  padding:6px 12px;border-radius:999px;margin-bottom:18px;}
[data-theme="dark"] .eyebrow{background:#1E2650;color:#AEBBFF;}
.hero .lead{font-size:18px;max-width:46ch;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px;}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:14px 24px;border-radius:var(--radius-s);
  font-weight:700;font-size:15px;border:var(--border-w) solid var(--line);cursor:pointer;
  transition:transform .12s ease, box-shadow .12s ease;
}
.btn:hover{transform:translate(-3px,-3px);box-shadow:var(--shadow-block);}
.btn-primary{background:var(--yellow);color:var(--ink);}
.btn-ghost{background:var(--paper-raised);color:var(--ink);}

/* QR hero visual — literal signature element, live-encodes text */
.hero-qr-wrap{
  background:var(--paper-raised);border:var(--border-w) solid var(--line);border-radius:var(--radius-l);
  box-shadow:var(--shadow-block);padding:28px;
}
.hero-qr-canvas{display:flex;justify-content:center;padding:16px;background:#fff;border-radius:var(--radius-m);border:1.5px solid var(--line-soft);}
.hero-qr-canvas svg{width:180px;height:180px;}
.hero-qr-input{margin-top:16px;display:flex;gap:8px;}
.hero-qr-input input{
  flex:1;padding:12px 14px;border-radius:var(--radius-s);border:var(--border-w) solid var(--line);
  font-family:var(--font-mono);font-size:14px;background:var(--paper);color:var(--ink);
}
.hero-qr-caption{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint);text-align:center;margin-top:10px;}

/* ---------- stat strip ---------- */
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:52px;}
@media (max-width:700px){.stat-strip{grid-template-columns:repeat(2,1fr);}}
.stat-strip div{background:var(--paper-raised);border:var(--border-w) solid var(--line);border-radius:var(--radius-m);padding:18px;}
.stat-strip b{display:block;font-family:var(--font-display);font-size:26px;}
.stat-strip span{font-size:13px;color:var(--ink-faint);}

/* ---------- search ---------- */
.search-wrap{margin-top:36px;position:relative;max-width:560px;}
.search-wrap input{
  width:100%;padding:15px 18px 15px 46px;border-radius:var(--radius-m);border:var(--border-w) solid var(--line);
  font-size:15px;background:var(--paper-raised);color:var(--ink);
}
.search-wrap .icn{position:absolute;left:16px;top:50%;transform:translateY(-50%);}

/* ---------- category / bento cards ---------- */
.cat-block{padding:56px 0;border-top:var(--border-w) dashed var(--line-soft);}
.cat-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:26px;flex-wrap:wrap;gap:10px;}
.cat-tag{font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint);}
.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media (max-width:900px){.tool-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:600px){.tool-grid{grid-template-columns:1fr;}}
.tool-card{
  background:var(--paper-raised);border:var(--border-w) solid var(--line);border-radius:var(--radius-l);
  padding:22px;position:relative;transition:transform .14s ease, box-shadow .14s ease;
}
.tool-card:hover{transform:translate(-4px,-4px);box-shadow:var(--shadow-block);}
.tool-card .chip{
  display:inline-block;font-family:var(--font-mono);font-size:11px;font-weight:700;padding:4px 9px;
  border-radius:999px;border:1.5px solid var(--line);margin-bottom:14px;
}
.chip-cobalt{background:#E4E9FF;color:var(--cobalt-ink);}
[data-theme="dark"] .chip-cobalt{background:#1E2650;color:#AEBBFF;}
.chip-yellow{background:#FFF3D2;color:#7A5300;}
[data-theme="dark"] .chip-yellow{background:#453200;color:#FFDD8A;}
.chip-coral{background:#FFE1E4;color:#93202D;}
[data-theme="dark"] .chip-coral{background:#4A1A20;color:#FFB3BA;}
.tool-card h3{margin-bottom:6px;}
.tool-card p{font-size:14px;margin-bottom:14px;}
.tool-card .go{font-family:var(--font-mono);font-weight:700;font-size:13px;color:var(--cobalt);}

/* ---------- tool page layout ---------- */
.breadcrumb{padding:16px 0;font-size:13px;color:var(--ink-faint);}
.breadcrumb a{font-weight:600;color:var(--ink-soft);}
.tool-page-head{padding:8px 0 32px;max-width:70ch;}
.tool-layout{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start;margin-bottom:36px;}
@media (max-width:860px){.tool-layout{grid-template-columns:1fr;}}
.panel{
  background:var(--paper-raised);border:var(--border-w) solid var(--line);border-radius:var(--radius-l);
  padding:26px;box-shadow:var(--shadow-block-sm);
}
.panel h2.panel-title{font-family:var(--font-mono);font-size:12.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:18px;}
.field{margin-bottom:16px;}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:6px;}
.field .hint{font-size:12px;color:var(--ink-faint);margin-top:5px;}
.field input[type=text],.field input[type=number],.field select,.field textarea{
  width:100%;padding:12px 14px;border-radius:var(--radius-s);border:var(--border-w) solid var(--line);
  font-size:14.5px;background:var(--paper);color:var(--ink);font-family:var(--font-body);
}
.field textarea{resize:vertical;min-height:120px;font-family:var(--font-mono);font-size:13.5px;}
.result-panel{
  background:var(--ink);color:var(--paper);border-radius:var(--radius-l);padding:26px;
  border:var(--border-w) solid var(--line);
}
[data-theme="dark"] .result-panel{background:var(--paper-raised);}
.result-lcd .r-label{font-family:var(--font-mono);font-size:12px;text-transform:uppercase;letter-spacing:.08em;opacity:.65;margin-bottom:8px;}
.result-lcd .r-value{font-family:var(--font-display);font-size:clamp(28px,4vw,42px);font-weight:700;word-break:break-word;}
.result-rows{margin-top:18px;padding-top:16px;border-top:1.5px solid rgba(255,255,255,.18);}
.result-rows div{display:flex;justify-content:space-between;font-size:13.5px;padding:6px 0;gap:12px;}
.result-rows span{opacity:.7;}
.result-rows b{font-weight:700;text-align:right;}
.copy-btn{
  margin-top:16px;width:100%;padding:12px;border-radius:var(--radius-s);border:var(--border-w) solid var(--paper);
  background:transparent;color:var(--paper);font-weight:700;cursor:pointer;font-size:14px;
}
.copy-btn:hover{background:var(--paper);color:var(--ink);}

.ad-slot{
  border:2px dashed var(--line-soft);border-radius:var(--radius-m);padding:26px;text-align:center;
  color:var(--ink-faint);font-family:var(--font-mono);font-size:12px;margin:32px 0;
}
.prose h2{margin-top:36px;}
.prose p{max-width:74ch;}
.related-grid{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;}
.related-grid a{
  padding:9px 15px;border-radius:999px;border:var(--border-w) solid var(--line);font-size:13.5px;font-weight:600;
  background:var(--paper-raised);
}
.related-grid a:hover{background:var(--yellow);}

/* faq */
.faq{margin-top:20px;}
.faq-item{border-bottom:1.5px solid var(--line-soft);}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:16px 0;font-family:var(--font-display);
  font-weight:700;font-size:16px;cursor:pointer;display:flex;justify-content:space-between;color:var(--ink);}
.faq-q::after{content:'+';font-size:22px;font-family:var(--font-body);color:var(--cobalt);}
.faq-item.open .faq-q::after{content:'−';}
.faq-a{max-height:0;overflow:hidden;transition:max-height .2s ease;}
.faq-item.open .faq-a{max-height:400px;}
.faq-a p{padding-bottom:16px;font-size:14.5px;}

/* ---------- footer ---------- */
.site-footer{border-top:var(--border-w) solid var(--line);margin-top:72px;padding:48px 0 28px;background:var(--paper-raised);}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px;margin-bottom:36px;}
@media (max-width:800px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
.footer-grid h4{font-family:var(--font-mono);font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:14px;}
.footer-grid a{display:block;font-size:14px;padding:5px 0;color:var(--ink-soft);}
.footer-grid a:hover{color:var(--cobalt);}
.footer-bottom{border-top:1.5px solid var(--line-soft);padding-top:20px;display:flex;justify-content:space-between;
  flex-wrap:wrap;gap:10px;font-size:12.5px;color:var(--ink-faint);}

/* ---------- legal pages ---------- */
.legal-page{max-width:74ch;padding-bottom:60px;}
.legal-page h2{margin-top:34px;}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease, transform .5s ease;}
.reveal.in{opacity:1;transform:none;}

/* ---------- form ---------- */
.form-panel{background:var(--paper-raised);border:var(--border-w) solid var(--line);border-radius:var(--radius-l);
  padding:28px;box-shadow:var(--shadow-block-sm);max-width:560px;}