/* ============================================================
   QR///  —  design tokens
   ============================================================ */
:root{
  --bg:        #0a0a0c;
  --bg-panel:  #131316;
  --bg-input:  #0e0e11;
  --line:      #232328;
  --line-soft: #1a1a1e;
  --text:      #ececee;
  --text-dim:  #8a8a92;
  --text-faint:#4d4d54;
  --accent:    #ff3b3b;   /* scanner laser red */
  --accent-dim:#5c1414;
  --ok:        #39d97a;
  --radius:    2px;
  --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --display: 'Unbounded', var(--mono);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--mono);
  font-size:15px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

/* faint module-grid backdrop, evokes QR pixels */
body{
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size:28px 28px;
  background-position:-1px -1px;
  background-attachment:fixed;
}

a{ color:inherit; }
img,svg{ display:block; max-width:100%; }

.wrap{
  max-width:1080px;
  margin:0 auto;
  padding:0 24px;
}

/* ---------- focus visibility ---------- */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; }
}

/* ============================================================
   Header / nav
   ============================================================ */
.site-header{
  border-bottom:1px solid var(--line);
  background:rgba(10,10,12,.92);
  backdrop-filter:blur(6px);
  position:sticky;
  top:0;
  z-index:40;
}
.site-header .wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:64px;
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--display);
  font-weight:600;
  font-size:16px;
  letter-spacing:.02em;
  text-decoration:none;
  color:var(--text);
}
.logo .mark{ width:20px; height:20px; }
.logo .mark rect{ fill:var(--text); }
.logo .mark .cut{ fill:var(--bg); }
.logo .slash{ color:var(--accent); }

.site-nav{
  display:flex;
  gap:28px;
  font-size:13px;
}
.site-nav a{
  text-decoration:none;
  color:var(--text-dim);
  position:relative;
  padding:4px 0;
}
.site-nav a:hover,
.site-nav a[aria-current="page"]{ color:var(--text); }
.site-nav a[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-2px;
  height:2px;
  background:var(--accent);
}
.nav-toggle{ display:none; }

/* ============================================================
   Hero
   ============================================================ */
.hero{
  padding:56px 0 32px;
  border-bottom:1px solid var(--line);
}
.eyebrow{
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--accent);
  display:flex;
  align-items:center;
  gap:8px;
  margin:0 0 16px;
}
.eyebrow::before{
  content:"";
  width:7px; height:7px;
  background:var(--accent);
  display:inline-block;
  animation:blink 1.6s steps(2,jump-none) infinite;
}
@keyframes blink{ 50%{ opacity:.15; } }

h1.headline{
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(28px, 5vw, 46px);
  line-height:1.12;
  letter-spacing:-.01em;
  margin:0 0 16px;
  max-width:16ch;
}
h1.headline em{
  font-style:normal;
  color:var(--accent);
}
.hero p.lede{
  color:var(--text-dim);
  max-width:56ch;
  font-size:14.5px;
  margin:0;
}

/* ============================================================
   Generator layout
   ============================================================ */
.generator{
  padding:40px 0 64px;
  display:grid;
  grid-template-columns:1fr 380px;
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.panel{
  background:var(--bg-panel);
  padding:28px;
}
.panel-label{
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-faint);
  margin:0 0 20px;
  display:flex;
  align-items:center;
  gap:8px;
}
.panel-label .n{ color:var(--text-dim); }

/* ---- tabs (data type) ---- */
.type-tabs{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border:1px solid var(--line);
  margin-bottom:24px;
}
.type-tabs button{
  background:var(--bg-input);
  color:var(--text-dim);
  border:none;
  border-right:1px solid var(--line);
  padding:10px 6px;
  font-family:var(--mono);
  font-size:12px;
  cursor:pointer;
}
.type-tabs button:last-child{ border-right:none; }
.type-tabs button[aria-selected="true"]{
  background:var(--bg);
  color:var(--text);
  box-shadow:inset 0 2px 0 var(--accent);
}
.type-tabs button:hover{ color:var(--text); }

/* ---- fields ---- */
.field{ margin-bottom:18px; }
.field label{
  display:block;
  font-size:12px;
  color:var(--text-dim);
  margin-bottom:7px;
}
.field .hint{
  color:var(--text-faint);
  font-size:11px;
  margin-top:6px;
}
input[type="text"],
input[type="url"],
input[type="email"],
input[type="password"],
textarea,
select{
  width:100%;
  background:var(--bg-input);
  border:1px solid var(--line);
  color:var(--text);
  padding:11px 12px;
  font-family:var(--mono);
  font-size:13.5px;
  border-radius:var(--radius);
}
textarea{ resize:vertical; min-height:88px; }
input:focus, textarea:focus, select:focus{ border-color:var(--accent); }
input::placeholder, textarea::placeholder{ color:var(--text-faint); }

.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:14px; }

/* range slider */
input[type="range"]{
  width:100%;
  accent-color:var(--accent);
  background:transparent;
  height:20px;
}
.range-row{ display:flex; align-items:center; gap:12px; }
.range-row output{
  font-size:12px;
  color:var(--text);
  min-width:52px;
  text-align:right;
}

/* error correction chips */
.chip-row{ display:flex; gap:8px; flex-wrap:wrap; }
.chip{
  background:var(--bg-input);
  border:1px solid var(--line);
  color:var(--text-dim);
  font-family:var(--mono);
  font-size:12px;
  padding:7px 12px;
  cursor:pointer;
  border-radius:var(--radius);
}
.chip[aria-pressed="true"]{
  border-color:var(--accent);
  color:var(--text);
}
.chip:hover{ color:var(--text); }

/* color pickers */
.color-field{ display:flex; align-items:center; gap:10px; }
.color-field input[type="color"]{
  -webkit-appearance:none;
  appearance:none;
  width:38px; height:38px;
  padding:0;
  border:1px solid var(--line);
  background:var(--bg-input);
  border-radius:var(--radius);
  cursor:pointer;
}
.color-field input[type="color"]::-webkit-color-swatch{ border:none; border-radius:1px; }
.color-field input[type="color"]::-webkit-color-swatch-wrapper{ padding:4px; }
.color-field code{ font-size:12px; color:var(--text-dim); }

fieldset{ border:none; padding:0; margin:0 0 18px; }
legend{ font-size:12px; color:var(--text-dim); margin-bottom:7px; padding:0; }

/* ============================================================
   Preview panel
   ============================================================ */
.preview-panel{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:flex-start;
}
.scan-frame{
  position:relative;
  width:100%;
  aspect-ratio:1/1;
  max-width:300px;
  background:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
}
.scan-frame .corner{
  position:absolute;
  width:22px; height:22px;
  border:2px solid var(--accent);
}
.scan-frame .corner.tl{ top:-1px; left:-1px; border-right:none; border-bottom:none; }
.scan-frame .corner.tr{ top:-1px; right:-1px; border-left:none; border-bottom:none; }
.scan-frame .corner.bl{ bottom:-1px; left:-1px; border-right:none; border-top:none; }
.scan-frame .corner.br{ bottom:-1px; right:-1px; border-left:none; border-top:none; }

.scan-frame canvas{ image-rendering:pixelated; max-width:88%; max-height:88%; }

.scanline{
  position:absolute;
  left:0; right:0; top:0;
  height:2px;
  background:linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow:0 0 8px 1px var(--accent);
  opacity:0;
}
.scanline.active{
  opacity:1;
  animation:sweep 0.9s cubic-bezier(.4,0,.2,1);
}
@keyframes sweep{
  0%{ top:0; opacity:0; }
  8%{ opacity:1; }
  92%{ opacity:1; }
  100%{ top:100%; opacity:0; }
}

.preview-meta{
  margin-top:16px;
  font-size:11.5px;
  color:var(--text-faint);
  text-align:center;
}
.preview-meta strong{ color:var(--text-dim); font-weight:400; }

.download-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
  width:100%;
  max-width:300px;
  margin-top:20px;
}

button.btn{
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.02em;
  padding:12px 14px;
  border-radius:var(--radius);
  cursor:pointer;
  border:1px solid var(--line);
  background:transparent;
  color:var(--text);
  text-align:center;
}
button.btn:hover{ border-color:var(--text-dim); }
button.btn.primary{
  background:var(--accent);
  border-color:var(--accent);
  color:#fff;
  font-weight:600;
}
button.btn.primary:hover{ background:#e42f2f; }
button.btn:disabled{ opacity:.4; cursor:not-allowed; }

/* ============================================================
   Feature strip
   ============================================================ */
.features{
  padding:56px 0;
  border-bottom:1px solid var(--line);
}
.section-title{
  font-family:var(--display);
  font-size:13px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-dim);
  margin:0 0 28px;
}
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.feature{
  background:var(--bg);
  padding:22px 24px;
}
.feature h3{
  font-size:14px;
  margin:0 0 8px;
  font-weight:600;
}
.feature p{
  margin:0;
  font-size:13px;
  color:var(--text-dim);
}
.feature .glyph{
  color:var(--accent);
  font-size:12px;
  margin-bottom:12px;
  font-family:var(--mono);
}

/* ============================================================
   FAQ
   ============================================================ */
.faq{ padding:56px 0; border-bottom:1px solid var(--line); }
.faq-item{ border-bottom:1px solid var(--line-soft); }
.faq-item:first-of-type{ border-top:1px solid var(--line-soft); }
.faq-item summary{
  cursor:pointer;
  padding:18px 0;
  font-size:14px;
  list-style:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:"+";
  color:var(--accent);
  font-size:16px;
  flex-shrink:0;
}
.faq-item[open] summary::after{ content:"−"; }
.faq-item p{
  margin:0 0 20px;
  color:var(--text-dim);
  font-size:13.5px;
  max-width:70ch;
}

/* ============================================================
   Simple content pages (privacidade / termos / sobre)
   ============================================================ */
.doc{
  padding:48px 0 80px;
  max-width:760px;
  margin:0 auto;
}
.doc h1{
  font-family:var(--display);
  font-size:28px;
  margin:0 0 8px;
}
.doc .updated{
  color:var(--text-faint);
  font-size:12px;
  margin-bottom:36px;
}
.doc h2{
  font-size:16px;
  margin:36px 0 12px;
  padding-top:20px;
  border-top:1px solid var(--line-soft);
}
.doc p, .doc li{
  color:var(--text-dim);
  font-size:14px;
  line-height:1.75;
}
.doc ul{ padding-left:20px; }
.doc a{ color:var(--accent); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer{ padding:32px 0 48px; }
.site-footer .wrap{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  align-items:center;
  justify-content:space-between;
  font-size:12px;
  color:var(--text-faint);
}
.site-footer nav{ display:flex; gap:20px; }
.site-footer a{ color:var(--text-faint); text-decoration:none; }
.site-footer a:hover{ color:var(--text-dim); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 860px){
  .generator{ grid-template-columns:1fr; }
  .feature-grid{ grid-template-columns:1fr; }
}
@media (max-width: 640px){
  .site-nav{
    position:fixed;
    inset:64px 0 0 0;
    background:var(--bg);
    flex-direction:column;
    padding:24px;
    gap:0;
    transform:translateX(100%);
    transition:transform .25s ease;
  }
  .site-nav.open{ transform:translateX(0); }
  .site-nav a{ padding:14px 0; border-bottom:1px solid var(--line-soft); font-size:15px; }
  .nav-toggle{
    display:block;
    background:none;
    border:1px solid var(--line);
    color:var(--text);
    width:38px; height:38px;
    font-family:var(--mono);
    cursor:pointer;
  }
  .grid-2{ grid-template-columns:1fr; }
  .type-tabs{ grid-template-columns:repeat(2,1fr); }
  .type-tabs button:nth-child(2){ border-right:none; }
}