/* QRelieve — generador de QR para imprimir en 3D */
:root{
  --bg:#f6f7f9; --surface:#ffffff; --surface-2:#f0f2f5;
  --ink:#151a21; --ink-2:#4b5563; --ink-3:#7b8794;
  --line:#e2e6ec; --line-2:#cfd6df;
  --accent:#2f6df6; --accent-ink:#ffffff; --accent-soft:#e8effe;
  --ok:#0f9d58; --warn:#b45309; --warn-bg:#fff7e6; --bad:#c62828; --bad-bg:#fdecea;
  --radius:14px; --radius-sm:10px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 8px 24px rgba(16,24,40,.06);
  --maxw:1180px;
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
/* modo oscuro: cubre los tres estados (sistema, claro forzado, oscuro forzado) */
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0f1216; --surface:#161b22; --surface-2:#1c232c;
    --ink:#e9edf3; --ink-2:#b3bcc9; --ink-3:#8792a2;
    --line:#252d38; --line-2:#333d4b;
    --accent:#5b8cff; --accent-ink:#0f1216; --accent-soft:#182640;
    --warn:#f0b357; --warn-bg:#2a2110; --bad:#ff8f87; --bad-bg:#2c1717;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
    --bg:#0f1216; --surface:#161b22; --surface-2:#1c232c;
    --ink:#e9edf3; --ink-2:#b3bcc9; --ink-3:#8792a2;
    --line:#252d38; --line-2:#333d4b;
    --accent:#5b8cff; --accent-ink:#0f1216; --accent-soft:#182640;
    --warn:#f0b357; --warn-bg:#2a2110; --bad:#ff8f87; --bad-bg:#2c1717;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);
  font-size:16px;line-height:1.62;-webkit-font-smoothing:antialiased}
img,canvas,svg{max-width:100%}
a{color:var(--accent);text-underline-offset:2px}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;letter-spacing:-.02em}
h1{font-size:clamp(1.7rem,4.2vw,2.5rem);font-weight:800}
h2{font-size:clamp(1.3rem,3vw,1.75rem);font-weight:750}
h3{font-size:1.05rem;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 18px}
.narrow{max-width:820px}

/* header */
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:16px;height:60px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;letter-spacing:-.02em;
  color:var(--ink);text-decoration:none;font-size:1.06rem}
.brand-mark{width:28px;height:28px;border-radius:8px;background:var(--ink);color:var(--bg);
  display:grid;place-items:center;font-size:.72rem;font-weight:800}
.site-header nav{margin-left:auto;display:flex;gap:18px;font-size:.9rem}
.site-header nav a{color:var(--ink-2);text-decoration:none}
.site-header nav a:hover{color:var(--accent)}
@media (max-width:620px){.site-header nav a.opt{display:none}}

/* hero */
.hero{padding:30px 0 8px;text-align:center}
@media (max-width:700px){
  .hero{padding:16px 0 4px}
  .hero .kicker{margin-bottom:8px;font-size:.7rem;padding:4px 9px}
  .hero p.lead{font-size:.94rem;line-height:1.45}
  .tool-card{margin-top:12px}
  .panel{padding:16px}
}
.hero p.lead{color:var(--ink-2);font-size:1.06rem;max-width:640px;margin:0 auto 6px}
.hero .kicker{display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;color:var(--accent);background:var(--accent-soft);
  padding:5px 11px;border-radius:999px;margin-bottom:12px}

/* tool card */
.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);margin:18px 0 12px;overflow:hidden}
.tool-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr)}
@media (max-width:900px){.tool-grid{grid-template-columns:1fr}}
.panel{padding:20px}
.panel.controls{border-right:1px solid var(--line)}
@media (max-width:900px){.panel.controls{border-right:0;border-bottom:1px solid var(--line)}}
.panel.preview{background:var(--surface-2)}

fieldset{border:0;padding:0;margin:0 0 18px}
fieldset:last-child{margin-bottom:0}
legend{font-size:.74rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;
  color:var(--ink-3);padding:0;margin-bottom:9px}
label{display:block;font-size:.85rem;font-weight:600;color:var(--ink-2);margin-bottom:5px}
input[type=text],input[type=url],input[type=password],select,textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line-2);border-radius:var(--radius-sm);
  background:var(--surface);color:var(--ink);font:inherit;font-size:.95rem}
input:focus-visible,select:focus-visible,button:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field{margin-bottom:12px}
.hint{font-size:.79rem;color:var(--ink-3);margin:4px 0 0}

/* segmented */
.seg{display:flex;gap:6px;background:var(--surface-2);padding:4px;border-radius:var(--radius-sm);
  border:1px solid var(--line)}
.panel.preview .seg{background:var(--surface)}
.seg button{flex:1;border:0;background:transparent;color:var(--ink-2);font:inherit;font-size:.87rem;
  font-weight:650;padding:8px 6px;border-radius:7px;cursor:pointer}
.seg button[aria-pressed=true]{background:var(--accent);color:var(--accent-ink)}

/* style / format tiles */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.tiles.three{grid-template-columns:repeat(3,1fr)}
.tile{border:1.5px solid var(--line-2);background:var(--surface);border-radius:var(--radius-sm);
  padding:9px 4px 7px;cursor:pointer;text-align:center;font:inherit;font-size:.75rem;
  font-weight:650;color:var(--ink-2);display:flex;flex-direction:column;align-items:center;gap:5px}
.tile svg{display:block}
.tile[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}

/* colors */
.colorpick{display:flex;align-items:center;gap:9px;border:1px solid var(--line-2);
  border-radius:var(--radius-sm);padding:6px 9px;background:var(--surface)}
.colorpick input[type=color]{width:34px;height:30px;padding:0;border:0;background:none;cursor:pointer}
.colorpick .cname{font-size:.82rem;color:var(--ink-2);font-weight:600}

/* emoji picker */
.emoji-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;margin-top:8px}
.emoji-grid button{border:1.5px solid transparent;background:var(--surface-2);border-radius:8px;
  font-size:1.15rem;line-height:1;padding:6px 0;cursor:pointer}
.panel.preview .emoji-grid button{background:var(--surface)}
.emoji-grid button[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft)}
.center-actions{display:flex;gap:8px;align-items:center;margin-top:9px;flex-wrap:wrap}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line-2);
  background:var(--surface);color:var(--ink);font:inherit;font-weight:650;font-size:.9rem;
  padding:10px 14px;border-radius:var(--radius-sm);cursor:pointer;text-decoration:none}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-size:1rem;padding:13px 18px}
.btn.primary:hover{filter:brightness(1.07);color:var(--accent-ink)}
.btn.small{padding:7px 11px;font-size:.82rem}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-row{display:flex;gap:9px;flex-wrap:wrap}

/* previews */
.pv-title{font-size:.74rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;
  color:var(--ink-3);margin:0 0 8px}
.qr-stage{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px;display:grid;place-items:center;min-height:220px}
.qr-stage canvas,.qr-stage svg{width:220px;height:220px;border-radius:6px}
#viewer{position:relative;width:100%;aspect-ratio:4/3;min-height:230px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden}
#viewer canvas{display:block;width:100%;height:100%}
.viewer-msg{position:absolute;inset:0;display:grid;place-items:center;text-align:center;
  padding:18px;font-size:.86rem;color:var(--ink-3)}
.viewer-hint{font-size:.78rem;color:var(--ink-3);margin:6px 0 0;text-align:center}

/* notes / warnings */
.notes{margin:12px 0 0;display:grid;gap:7px}
.note{display:flex;gap:8px;align-items:flex-start;font-size:.83rem;line-height:1.45;
  border-radius:9px;padding:8px 11px;border:1px solid var(--line)}
.note.ok{background:var(--surface);color:var(--ink-2)}
.note.warn{background:var(--warn-bg);color:var(--warn);border-color:transparent}
.note.bad{background:var(--bad-bg);color:var(--bad);border-color:transparent}
.note b{font-weight:700}

.dl-block{margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.dl-block + .dl-block{margin-top:12px}
.dl-label{font-size:.8rem;font-weight:700;color:var(--ink-2);margin:0 0 8px}
.badge-privacy{display:flex;gap:9px;align-items:center;justify-content:center;flex-wrap:wrap;
  font-size:.85rem;color:var(--ink-2);margin:2px 0 6px;text-align:center}
.limits{text-align:center;font-size:.8rem;color:var(--ink-3);margin:0 0 8px}
.status{font-size:.82rem;color:var(--ink-3);min-height:1.2em;margin:8px 0 0}
.spinner{display:inline-block;width:13px;height:13px;border:2px solid var(--line-2);
  border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spinner{animation-duration:2s}}
.nojs{display:none}
.no-js .nojs{display:block;background:var(--warn-bg);color:var(--warn);padding:14px;border-radius:var(--radius-sm);font-size:.9rem}
.no-js .tool-grid{display:none}

/* ad slots */
.ad-slot{display:grid;place-items:center;border:1px dashed var(--line-2);border-radius:var(--radius-sm);
  background:var(--surface-2);color:var(--ink-3);font-size:.72rem;font-weight:800;letter-spacing:.16em;
  margin:26px auto;max-width:970px}
.ad-leaderboard{min-height:100px}
.ad-incontent{min-height:260px;max-width:640px}
.ad-popup{min-height:250px;width:100%;max-width:336px;margin:0 auto}
.ad-toast{min-height:90px;width:100%}
@media (max-width:520px){.ad-toast{min-height:60px}aside.corner{padding:9px}}

/* sections */
section.block{padding:34px 0}
section.block > .wrap > h2{text-align:center}
.sub{text-align:center;color:var(--ink-2);max-width:660px;margin:0 auto 24px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:760px){.steps{grid-template-columns:1fr}}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.step .n{width:30px;height:30px;border-radius:9px;background:var(--accent-soft);color:var(--accent);
  display:grid;place-items:center;font-weight:800;font-size:.9rem;margin-bottom:11px}
.step h3{margin-bottom:.35em}
.step p{margin:0;color:var(--ink-2);font-size:.92rem}
.uses{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media (max-width:860px){.uses{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.uses{grid-template-columns:1fr}}
.use{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:17px}
.use .ico{font-size:1.5rem;line-height:1;margin-bottom:8px}
.use h3{font-size:.98rem;margin-bottom:.3em}
.use p{margin:0;font-size:.88rem;color:var(--ink-2)}
.prose{color:var(--ink-2)}
.prose h2,.prose h3{color:var(--ink);text-align:left}
.prose ul{padding-left:1.15em}
.prose li{margin-bottom:.4em}
details.faq{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px 16px;margin-bottom:10px}
details.faq summary{cursor:pointer;font-weight:700;font-size:.97rem;list-style:none;
  display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-weight:700;color:var(--accent);flex:0 0 auto}
details.faq[open] summary::after{content:"−"}
details.faq p{margin:.7em 0 0;color:var(--ink-2);font-size:.92rem}

footer.site-footer{border-top:1px solid var(--line);margin-top:26px;padding:26px 0;
  color:var(--ink-3);font-size:.85rem}
footer.site-footer .wrap{display:flex;gap:16px;flex-wrap:wrap;align-items:center;justify-content:space-between}
footer.site-footer a{color:var(--ink-2);text-decoration:none;margin-right:14px}
footer.site-footer a:hover{color:var(--accent)}

/* download interstitial */
dialog.promo{border:0;padding:0;border-radius:var(--radius);max-width:400px;width:calc(100% - 32px);
  background:var(--surface);color:var(--ink);box-shadow:0 20px 60px rgba(0,0,0,.35)}
dialog.promo::backdrop{background:rgba(10,14,20,.55)}
.promo-head{display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:14px 16px;border-bottom:1px solid var(--line)}
.promo-head strong{font-size:.95rem}
.promo-close{border:0;background:var(--surface-2);color:var(--ink-2);width:30px;height:30px;
  border-radius:8px;font-size:1.1rem;line-height:1;cursor:pointer}
.promo-body{padding:16px}
.promo-body p{font-size:.88rem;color:var(--ink-2)}
.promo-foot{padding:0 16px 16px;text-align:center}

/* corner toast */
aside.corner{position:fixed;right:16px;bottom:16px;z-index:50;width:290px;max-width:calc(100vw - 32px);
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:12px;display:none}
aside.corner.show{display:block}
aside.corner .corner-head{display:flex;justify-content:space-between;align-items:center;
  font-size:.7rem;font-weight:800;letter-spacing:.14em;color:var(--ink-3);margin-bottom:8px}
aside.corner button.corner-close{border:0;background:transparent;color:var(--ink-3);cursor:pointer;
  font-size:1rem;line-height:1;padding:0 2px}
@media (max-width:520px){aside.corner{right:10px;bottom:10px;width:calc(100vw - 20px)}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0}