/* qrfreetool — Premium static UI (mobile-first)
   Base UI: CSS variables + subtle motion + accessible defaults
*/

:root{
  --bg: #0b1020;
  --bg2:#0f1730;
  --surface:#121c3a;
  --surface2:#0f1a38;
  --card:#141f42;
  --text:#eaf0ff;
  --muted:#b7c3e6;
  --muted2:#8fa0cf;
  --border: rgba(255,255,255,.10);
  --shadow: 0 18px 40px rgba(0,0,0,.35);
  --shadow2: 0 10px 24px rgba(0,0,0,.28);
  --accent:#6cf0ff;
  --accent2:#9d7bff;
  --good:#4ade80;
  --warn:#fbbf24;
  --bad:#fb7185;

  --radius-xl: 22px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 12px;

  --max: 1140px;

  color-scheme: dark;
}

body.theme-light{
  --bg: #f7f9ff;
  --bg2:#ffffff;
  --surface:#ffffff;
  --surface2:#ffffff;
  --card:#ffffff;
  --text:#0b132b;
  --muted:#344268;
  --muted2:#5f6f9a;
  --border: rgba(10,25,60,.12);
  --shadow: 0 18px 40px rgba(10,25,60,.12);
  --shadow2: 0 10px 24px rgba(10,25,60,.10);
  --accent:#2563eb;
  --accent2:#7c3aed;
  --good:#16a34a;
  --warn:#d97706;
  --bad:#e11d48;

  color-scheme: light;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji";
  line-height:1.55;
  color:var(--text);
  background:
    radial-gradient(1200px 800px at 20% -10%, rgba(108,240,255,.14), transparent 60%),
    radial-gradient(900px 600px at 90% 0%, rgba(157,123,255,.12), transparent 55%),
    radial-gradient(900px 650px at 70% 105%, rgba(37,99,235,.10), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  min-height:100vh;
}

img{max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline}
p{margin:0 0 12px}
ul,ol{margin:0 0 14px;padding-left:18px}
small{color:var(--muted2)}
code,kbd{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.skip-link{
  position:absolute;left:-999px;top:10px;
  background:var(--accent);color:#001024;
  padding:10px 14px;border-radius:12px;
  z-index:9999;
}
.skip-link:focus{left:10px}

.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 16px}
.section{padding:52px 0}
.section.tight{padding:34px 0}

.grid{display:grid;gap:18px}
.grid.cols-2{grid-template-columns:1fr}
.grid.cols-3{grid-template-columns:1fr}
@media (min-width:900px){
  .grid.cols-2{grid-template-columns:1fr 1fr}
  .grid.cols-3{grid-template-columns:repeat(3,1fr)}
  .layout-2col{display:grid;grid-template-columns:1fr 340px;gap:22px;align-items:start}
}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow2);
  overflow:hidden;
  position:relative;
}
.card.pad{padding:18px}
.card.pad-lg{padding:22px}
.card::before{
  content:"";
  position:absolute;inset:-1px;
  background: radial-gradient(600px 160px at 10% 0%, rgba(108,240,255,.18), transparent 60%),
              radial-gradient(600px 160px at 90% 0%, rgba(157,123,255,.16), transparent 55%);
  pointer-events:none;
  opacity:.65;
}
.card > *{position:relative}

.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 12px;border-radius:999px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.05);
  color:var(--muted);
  font-size:12px;
}

.h1{
  font-size: clamp(30px, 3.4vw, 48px);
  line-height:1.1;
  letter-spacing:-0.02em;
  margin:0 0 12px;
}
.h2{
  font-size: clamp(22px, 2.2vw, 30px);
  letter-spacing:-0.01em;
  margin:0 0 10px;
}
.h3{
  font-size: 18px;
  margin:0 0 8px;
}
.lead{font-size: clamp(15px, 1.3vw, 18px); color: var(--muted); margin:0 0 16px}
.kicker{color:var(--muted2);text-transform:uppercase;letter-spacing:.14em;font-size:12px;margin:0 0 10px}

.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.btn{
  appearance:none;border:0;cursor:pointer;
  padding:12px 14px;border-radius:14px;
  font-weight:650;
  display:inline-flex;align-items:center;gap:10px;
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease, background .15s ease;
  box-shadow: 0 10px 22px rgba(0,0,0,.22);
}
.btn:focus{outline: 3px solid rgba(108,240,255,.35); outline-offset:2px}
.btn.primary{
  color:#061125;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
}
.btn.primary:hover{transform: translateY(-2px); box-shadow: 0 14px 30px rgba(0,0,0,.28)}
.btn.ghost{
  color:var(--text);
  background: rgba(255,255,255,.06);
  border:1px solid var(--border);
  box-shadow:none;
}
.btn.ghost:hover{transform: translateY(-2px); background: rgba(255,255,255,.08)}
.btn.danger{
  color:#30020b;background: rgba(251,113,133,.92);
}
.btn.small{padding:10px 12px;border-radius:12px;font-size:14px}
.btn.icon{padding:10px 11px}
.btn[disabled]{opacity:.6;cursor:not-allowed;transform:none}

.input, select, textarea{
  width:100%;
  padding:12px 12px;
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  font-size: 14px;
}
textarea{min-height:110px;resize:vertical}
label{display:block;margin:0 0 6px;font-weight:650;color:var(--muted)}
.form-row{display:grid;gap:12px}
@media(min-width:820px){.form-row.cols-2{grid-template-columns:1fr 1fr}}

.hr{
  height:1px;background:var(--border);margin:14px 0;
}

.header-wrap{
  position:sticky;top:0;z-index:50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(10,16,32,.72), rgba(10,16,32,.40));
  border-bottom: 1px solid var(--border);
}
body.theme-light .header-wrap{
  background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.62));
}
.header{
  display:flex;align-items:center;justify-content:space-between;
  padding: 12px 0;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:850;letter-spacing:-0.02em;
}
.brand .logo{
  width:36px;height:36px;border-radius:12px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 12px 26px rgba(0,0,0,.25);
  display:grid;place-items:center;
  font-weight:900;color:#081126;
}
.nav{
  display:none;gap:10px;align-items:center;
}
.nav a{
  color:var(--muted);
  padding:10px 10px;border-radius:12px;
  border:1px solid transparent;
  transition: background .15s ease, transform .15s ease;
  font-weight:650;font-size:14px;
}
.nav a:hover{background: rgba(255,255,255,.06); transform: translateY(-1px); text-decoration:none}
.nav a.active{color:var(--text);border-color: var(--border); background: rgba(255,255,255,.06)}

.header-actions{display:flex;align-items:center;gap:10px}

.mobile-toggle{
  display:inline-flex;
}
@media(min-width:900px){
  .nav{display:flex}
  .mobile-toggle{display:none}
}

.drawer{
  position:fixed;inset:0;z-index:80;
  display:none;
}
.drawer.open{display:block}
.drawer .backdrop{
  position:absolute;inset:0;background: rgba(0,0,0,.5);
}
.drawer .panel{
  position:absolute;right:0;top:0;height:100%;width:min(86vw, 360px);
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.03));
  border-left:1px solid var(--border);
  padding:18px;
  box-shadow: var(--shadow);
}
.drawer .panel a{
  display:block;padding:12px 12px;border-radius:14px;
  color:var(--muted);border:1px solid transparent;
}
.drawer .panel a:hover{background: rgba(255,255,255,.06);text-decoration:none}
.drawer .panel a.active{color:var(--text);border-color: var(--border); background: rgba(255,255,255,.06)}
.drawer .panel .panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}

.hero{
  padding: 44px 0 18px;
}
.hero-grid{
  display:grid;gap:18px;align-items:center;
}
@media(min-width:900px){.hero-grid{grid-template-columns:1.3fr .7fr}}
.hero-art{
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background:
    radial-gradient(900px 400px at 20% 0%, rgba(108,240,255,.20), transparent 55%),
    radial-gradient(800px 400px at 85% 15%, rgba(157,123,255,.18), transparent 55%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
  overflow:hidden;
  padding:20px;
}
.qr-mock{
  display:grid;gap:14px;
}
.qr-tile{
  border-radius: 18px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.05);
  padding:16px;
}
.qr-grid{
  display:grid;grid-template-columns:repeat(9,1fr);gap:6px;
}
.qr-grid span{
  width:100%;aspect-ratio:1/1;border-radius:5px;
  background: rgba(255,255,255,.10);
}
.qr-grid span.on{background: rgba(108,240,255,.9)}
body.theme-light .qr-grid span.on{background: rgba(37,99,235,.88)}
.qr-grid span.on2{background: rgba(157,123,255,.9)}
body.theme-light .qr-grid span.on2{background: rgba(124,58,237,.85)}

.note{
  border:1px solid var(--border);
  background: rgba(255,255,255,.05);
  border-radius: 16px;
  padding:12px 12px;
  color: var(--muted);
}
.note strong{color:var(--text)}
.note.good{border-color: rgba(74,222,128,.35); background: rgba(74,222,128,.12)}
.note.warn{border-color: rgba(251,191,36,.35); background: rgba(251,191,36,.12)}
.note.bad{border-color: rgba(251,113,133,.35); background: rgba(251,113,133,.10)}

.tabs{display:flex;gap:10px;flex-wrap:wrap;margin: 10px 0 14px}
.tab{
  padding:10px 12px;border-radius:14px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.05);
  color:var(--muted);
  cursor:pointer;
  font-weight:700;
}
.tab[aria-selected="true"]{color:var(--text); background: rgba(255,255,255,.08)}

.result{
  display:grid;gap:10px;
}
.result pre{
  margin:0;
  padding:12px;
  border-radius:14px;
  border:1px solid var(--border);
  background: rgba(0,0,0,.22);
  overflow:auto;
  white-space:pre-wrap;
  word-break:break-word;
  color: var(--text);
}
body.theme-light .result pre{background: rgba(10,25,60,.06)}
.result-actions{display:flex;flex-wrap:wrap;gap:10px}

.ad{
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(255,255,255,.22);
  background: rgba(255,255,255,.04);
  color: var(--muted2);
  padding: 14px;
  min-height: 90px;
  display:grid;place-items:center;
  text-align:center;
}
body.theme-light .ad{border-color: rgba(10,25,60,.22)}
.ad.small{min-height:70px}
.ad.side{min-height:300px}
.ad.hidden{display:none !important}

.footer{
  padding: 38px 0;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.10);
}
body.theme-light .footer{background: rgba(10,25,60,.03)}
.footer-grid{display:grid;gap:18px}
@media(min-width:900px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr}}

.footer a{color:var(--muted)}
.footer a:hover{color:var(--text); text-decoration:none}
.footer .muted{color:var(--muted2)}

.fade-up{opacity:0; transform: translateY(12px); transition: opacity .55s ease, transform .55s ease}
.fade-up.in-view{opacity:1; transform: translateY(0px)}

.table{
  width:100%;
  border-collapse:separate;
  border-spacing:0;
  overflow:hidden;
  border-radius: 18px;
  border:1px solid var(--border);
}
.table th, .table td{
  padding:12px;
  border-bottom:1px solid var(--border);
  vertical-align:top;
}
.table th{color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.10em}
.table tr:last-child td{border-bottom:0}

.pill{
  display:inline-flex;align-items:center;
  padding:6px 10px;border-radius:999px;
  background: rgba(255,255,255,.06);
  border:1px solid var(--border);
  color:var(--muted);
  font-size:12px;
  gap:8px;
}

.cookie{
  position:fixed;left:14px;right:14px;bottom:14px;z-index:90;
  max-width: 900px;margin:0 auto;
  border-radius: 22px;
  border:1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.05));
  box-shadow: var(--shadow);
  padding: 14px 14px;
  display:none;
}
.cookie.show{display:block}
.cookie .row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between}
.cookie .text{color:var(--muted);max-width: 620px}
.cookie .text strong{color:var(--text)}

kbd{
  padding:2px 7px;border-radius:8px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.06);
  color:var(--muted);
  font-size:12px;
}

.post-card{
  padding:18px;
  display:grid;gap:10px;
}
.post-card .meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;color:var(--muted2);font-size:13px}
.post-card h3{margin:0;font-size:18px;letter-spacing:-0.01em}
.post-card p{color:var(--muted);margin:0}
.post-card .tags{display:flex;flex-wrap:wrap;gap:8px}

.article{
  padding: 18px;
}
.article h1{margin:0 0 10px;font-size: clamp(26px, 2.8vw, 42px);letter-spacing:-0.02em;line-height:1.12}
.article h2{margin:20px 0 8px;font-size:22px}
.article h3{margin:16px 0 6px;font-size:18px}
.article .meta{display:flex;flex-wrap:wrap;gap:12px;color:var(--muted2);font-size:13px;margin-bottom:14px}
.article .summary{
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
  padding: 14px;
  margin: 14px 0;
}
.article .summary h2{margin:0 0 8px;font-size:18px}
.article .toc{
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  padding: 14px;
  margin: 14px 0;
}
.article blockquote{
  margin:14px 0;
  padding: 12px 12px;
  border-left:4px solid rgba(108,240,255,.5);
  background: rgba(255,255,255,.04);
  border-radius: 14px;
  color:var(--muted);
}

.notice{
  border-radius: 18px;
  padding: 12px 12px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.04);
  color: var(--muted);
}
.notice strong{color:var(--text)}