/* =============================================================================
   QR3D — hoja de estilos unica
   1 Tokens · 2 Reset · 3 Utilidades · 4 Tipografia · 5 Cabecera · 6 Herramienta
   7 Anuncios · 8 Secciones · 9 Pie · 10 Responsive · 11 Movimiento reducido
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  --ink:        #14161c;
  --ink-soft:   #4b5160;
  --ink-faint:  #737a8a;
  --bg:         #f5f6f8;
  --surface:    #ffffff;
  --surface-2:  #fafbfc;
  --line:       #e2e5ea;
  --line-soft:  #eceef2;
  --accent:     #ff5c1f;
  --accent-ink: #ffffff;
  --accent-dim: #fff1ea;
  --ok:         #17794a;
  --warn:       #a55c00;
  --warn-bg:    #fff6e6;
  --danger:     #c0261f;
  --danger-bg:  #fdecea;

  --radius:     14px;
  --radius-sm:  9px;
  --gutter:     clamp(1rem, 4vw, 2rem);
  --maxw:       1220px;
  --shadow:     0 1px 2px rgba(20,22,28,.05), 0 8px 24px -12px rgba(20,22,28,.14);
  --shadow-lg:  0 2px 6px rgba(20,22,28,.06), 0 22px 48px -22px rgba(20,22,28,.26);
  --ease-out:   cubic-bezier(.16, 1, .3, 1);
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
          "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef0f4; --ink-soft: #a8b0c0; --ink-faint: #838b9b;
    --bg: #0e1015; --surface: #171a21; --surface-2: #1c1f27;
    --line: #2a2e38; --line-soft: #23262f;
    --accent: #ff6d33; --accent-ink: #16171b; --accent-dim: #2a1b13;
    --ok: #4fc98a; --warn: #ffc46b; --warn-bg: #2c2415;
    --danger: #ff8078; --danger-bg: #2e1a19;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 28px -14px rgba(0,0,0,.7);
    --shadow-lg: 0 2px 6px rgba(0,0,0,.45), 0 24px 52px -24px rgba(0,0,0,.8);
  }
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: 16px; line-height: 1.62;
  color: var(--ink); background: var(--bg);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: clip;
}
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
input, select { font: inherit; color: inherit; }
a { color: inherit; }
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; line-height: 1.12; letter-spacing: -.021em; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2.5px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
fieldset { border: 0; padding: 0; }
[id] { scroll-margin-top: 74px; }
legend { padding: 0; }

/* ---------- 3. Utilidades ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--texto { max-width: 74ch; }
.skip-link {
  position: fixed; top: -100px; left: 1rem; z-index: 999;
  padding: .65rem 1.1rem; background: var(--ink); color: var(--bg);
  border-radius: 8px; font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 1rem; }

/* ---------- 4. Tipografia ---------- */
h1 { font-size: clamp(1.65rem, 4.4vw, 2.55rem); font-weight: 780; }
h2 { font-size: clamp(1.35rem, 3vw, 1.95rem); font-weight: 720; }
h3 { font-size: 1.06rem; font-weight: 680; }
code { font-family: var(--mono); font-size: .88em; background: var(--surface-2);
  border: 1px solid var(--line-soft); border-radius: 5px; padding: .05em .35em; }

/* ---------- 5. Cabecera ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 60px; }
.brand { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none;
  font-weight: 800; letter-spacing: -.03em; font-size: 1.15rem; }
.brand-mark { color: var(--accent); flex: none; }
.header-nav { display: flex; gap: 1.35rem; font-size: .92rem; font-weight: 550; }
.header-nav a { color: var(--ink-soft); text-decoration: none;
  transition: color .2s var(--ease-out); }
.header-nav a:hover { color: var(--ink); }

/* ---------- 6. Herramienta ---------- */
.hero { padding: clamp(1.4rem, 3.6vw, 2.6rem) 0 1.4rem; }
.hero h1 { margin-bottom: .5rem; }
.lede { color: var(--ink-soft); font-size: clamp(.98rem, 1.6vw, 1.09rem);
  max-width: 68ch; margin-bottom: clamp(1.2rem, 2.6vw, 1.8rem); }
.lede strong { color: var(--ink); }

.tool {
  display: grid; gap: clamp(.9rem, 2vw, 1.35rem);
  grid-template-columns: 1fr;
  align-items: start;
}
@media (min-width: 960px) {
  .tool { grid-template-columns: minmax(360px, 1fr) minmax(400px, 1.05fr); }
  .tool-previews { position: sticky; top: 76px; }
}
.tool-controls, .tool-previews { display: grid; gap: clamp(.9rem, 2vw, 1.15rem); }

.ctl {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(1rem, 2.4vw, 1.3rem);
  box-shadow: var(--shadow);
}
.ctl legend {
  font-weight: 700; font-size: .95rem; letter-spacing: -.01em;
  margin-bottom: .9rem; color: var(--ink);
}
.field { display: block; margin-bottom: .85rem; }
.field:last-child { margin-bottom: 0; }
.field-label { display: block; font-size: .82rem; font-weight: 620;
  color: var(--ink-soft); margin-bottom: .38rem; letter-spacing: .005em; }
.field-label em { font-style: normal; font-weight: 500; color: var(--ink-faint); }
input[type="text"], select {
  width: 100%; padding: .62rem .78rem;
  background: var(--surface-2); color: var(--ink);
  border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  transition: border-color .18s var(--ease-out), background .18s var(--ease-out);
}
input[type="text"]:focus, select:focus { border-color: var(--accent); background: var(--surface); outline: none; }
input[type="text"]::placeholder { color: var(--ink-faint); }
.grid-2 { display: grid; gap: .7rem; grid-template-columns: 1fr; }
@media (min-width: 540px) { .grid-2 { grid-template-columns: 1fr 1fr; } }
.hint { font-size: .8rem; color: var(--ink-faint); line-height: 1.5; margin-top: .45rem; }

/* segmentos y chips */
.seg { display: flex; gap: .3rem; padding: .25rem; background: var(--surface-2);
  border: 1px solid var(--line); border-radius: 11px; margin-bottom: .9rem; }
.seg-btn { flex: 1; padding: .48rem .5rem; border-radius: 8px; font-size: .88rem;
  font-weight: 600; color: var(--ink-soft); transition: all .18s var(--ease-out); }
.seg-btn.is-on { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.chips { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .95rem; }
.chip { padding: .42rem .8rem; border-radius: 999px; font-size: .85rem; font-weight: 570;
  background: var(--surface-2); border: 1.5px solid var(--line); color: var(--ink-soft);
  transition: all .18s var(--ease-out); }
.chip:hover { border-color: var(--ink-faint); color: var(--ink); }
.chip.is-on { background: var(--ink); border-color: var(--ink); color: var(--bg); }

/* colores */
.colores { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; margin-bottom: .6rem; }
.color-pick { display: inline-flex; align-items: center; gap: .5rem; padding: .32rem .6rem .32rem .34rem;
  background: var(--surface-2); border: 1.5px solid var(--line); border-radius: 999px;
  font-size: .82rem; font-weight: 570; color: var(--ink-soft); cursor: pointer; }
.color-pick input[type="color"] {
  width: 30px; height: 30px; padding: 0; border: 0; border-radius: 50%;
  background: none; cursor: pointer; flex: none;
}
.color-pick input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-pick input[type="color"]::-webkit-color-swatch { border: 1.5px solid var(--line); border-radius: 50%; }
.color-pick input[type="color"]::-moz-color-swatch { border: 1.5px solid var(--line); border-radius: 50%; }
.mini-btn { padding: .42rem .75rem; border-radius: 999px; font-size: .8rem; font-weight: 600;
  background: var(--surface-2); border: 1.5px solid var(--line); color: var(--ink-soft);
  transition: all .18s var(--ease-out); }
.mini-btn:hover { border-color: var(--ink-faint); color: var(--ink); }
.mini-btn.as-label { display: inline-block; cursor: pointer; }
.paletas { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .35rem; }
.paleta { width: 42px; height: 26px; border-radius: 7px; border: 1.5px solid var(--line);
  padding: 0; overflow: hidden; display: flex; transition: transform .18s var(--ease-out); }
.paleta:hover { transform: translateY(-2px); }
.paleta span { flex: 1; }

/* emojis y centro */
.emoji-row { display: flex; flex-wrap: wrap; gap: .28rem; margin-bottom: .55rem; }
.emoji-btn { width: 34px; height: 34px; border-radius: 9px; font-size: 1.05rem; line-height: 1;
  display: grid; place-items: center; background: var(--surface-2);
  border: 1.5px solid var(--line); transition: all .16s var(--ease-out); }
.emoji-btn:hover { transform: translateY(-2px); border-color: var(--ink-faint); }
.emoji-btn.is-on { background: var(--accent-dim); border-color: var(--accent); }
.emoji-row--label { margin-top: -.35rem; }
.centro-acciones { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }

/* rangos */
input[type="range"] { width: 100%; accent-color: var(--accent); height: 26px; }
output { font-variant-numeric: tabular-nums; font-weight: 680; color: var(--ink); }

/* formatos 3D */
.formatos { display: grid; grid-template-columns: repeat(3, 1fr); gap: .45rem; margin-bottom: .95rem; }
.fmt { display: grid; gap: .18rem; justify-items: center; text-align: center;
  padding: .7rem .35rem .6rem; border-radius: 11px; background: var(--surface-2);
  border: 1.5px solid var(--line); color: var(--ink-soft);
  transition: all .18s var(--ease-out); }
.fmt svg { width: 38px; height: 32px; margin-bottom: .1rem; }
.fmt strong { font-size: .8rem; font-weight: 640; color: var(--ink); line-height: 1.2; }
.fmt small { font-size: .68rem; color: var(--ink-faint); line-height: 1.25; }
.fmt:hover { border-color: var(--ink-faint); }
.fmt.is-on { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }
.fmt.is-on strong { color: var(--ink); }

/* avisos de impresion */
.avisos { list-style: none; padding: 0; display: grid; gap: .35rem; margin-top: .3rem; }
.avisos li { font-size: .8rem; line-height: 1.45; padding: .45rem .6rem; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--line-soft); color: var(--ink-soft); }
.avisos li.is-ok { color: var(--ok); }
.avisos li.is-warn { background: var(--warn-bg); border-color: transparent; color: var(--warn); }
.avisos li.is-bad { background: var(--danger-bg); border-color: transparent; color: var(--danger); font-weight: 560; }

/* vistas previas */
.preview-card { background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(.9rem, 2.2vw, 1.2rem); box-shadow: var(--shadow); }
.preview-head { display: flex; align-items: center; justify-content: space-between;
  gap: .6rem; margin-bottom: .75rem; }
.preview-head h2 { font-size: .95rem; font-weight: 700; letter-spacing: -.01em; }
.tag { font-size: .72rem; font-weight: 600; color: var(--ink-faint);
  font-variant-numeric: tabular-nums; text-align: right; }
.qr-stage { display: grid; place-items: center; padding: .5rem;
  background: var(--surface-2); border-radius: 11px; border: 1px solid var(--line-soft); }
.qr-stage canvas { width: min(100%, 300px); height: auto; border-radius: 6px;
  image-rendering: -webkit-optimize-contrast; }

.viewer-stage { position: relative; aspect-ratio: 4 / 3; border-radius: 11px;
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 62%),
    var(--surface-2);
  border: 1px solid var(--line-soft); overflow: hidden; }
.viewer-stage canvas { width: 100%; height: 100%; touch-action: none; cursor: grab; }
.viewer-stage canvas.is-grabbing { cursor: grabbing; }
.viewer-msg { position: absolute; inset: 0; display: grid; place-items: center;
  text-align: center; padding: 1.2rem; font-size: .86rem; color: var(--ink-faint);
  pointer-events: none; }
.viewer-msg[hidden] { display: none; }
.viewer-reset { position: absolute; right: .5rem; bottom: .5rem; padding: .3rem .6rem;
  font-size: .72rem; font-weight: 600; border-radius: 7px; color: var(--ink-soft);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  border: 1px solid var(--line); backdrop-filter: blur(6px); }
.viewer-hint { font-size: .76rem; color: var(--ink-faint); margin: .5rem 0 .8rem; }

/* botones de descarga */
.dl-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-top: .8rem; }
.dl-row--main { display: grid; gap: .45rem; margin-top: 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .62rem 1.05rem; border-radius: 10px; font-weight: 640; font-size: .9rem;
  border: 1.5px solid transparent; transition: all .18s var(--ease-out); }
.btn-ghost { background: var(--surface-2); border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink-faint); transform: translateY(-1px); }
.btn-primary { flex-direction: column; gap: .1rem; padding: .8rem 1.2rem;
  background: var(--accent); color: var(--accent-ink); font-size: 1rem; font-weight: 700; }
.btn-primary small { font-size: .72rem; font-weight: 500; opacity: .88; }
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.06);
  box-shadow: 0 10px 24px -10px color-mix(in srgb, var(--accent) 70%, transparent); }
.btn-primary[disabled], .btn[disabled] { opacity: .55; cursor: progress; transform: none; }
.btn-link { background: none; color: var(--ink-soft); font-size: .82rem; font-weight: 560;
  text-decoration: underline; text-underline-offset: 3px; padding: .3rem; }
.btn-link:hover { color: var(--ink); }
.check { display: inline-flex; align-items: center; gap: .35rem; font-size: .78rem;
  color: var(--ink-soft); cursor: pointer; }
.check input { accent-color: var(--accent); }

.privacidad-badge { margin-top: 1.1rem; font-size: .86rem; color: var(--ink-soft);
  background: var(--surface); border: 1px solid var(--line); border-radius: 11px;
  padding: .7rem .9rem; }
.privacidad-badge strong { color: var(--ink); }
.noscript-aviso { margin-top: .7rem; padding: .7rem .9rem; border-radius: 11px;
  background: var(--warn-bg); color: var(--warn); font-size: .88rem; }

/* ---------- 7. Anuncios (solo huecos, sin scripts de terceros) ---------- */
.ad-slot {
  position: relative; display: grid; place-items: center;
  border: 1.5px dashed var(--line); border-radius: var(--radius);
  background: repeating-linear-gradient(135deg,
    transparent 0 11px, color-mix(in srgb, var(--ink) 3%, transparent) 11px 22px);
  color: var(--ink-faint);
}
.ad-label { font-size: .68rem; font-weight: 750; letter-spacing: .18em; }
.ad-slot--banner { min-height: 96px; margin: clamp(1.4rem, 3vw, 2.2rem) 0; }
.ad-slot--inline { min-height: 268px; max-width: 340px; margin: 0 auto clamp(1.6rem, 3vw, 2.4rem); }
.ad-slot--modal { min-height: 244px; width: 100%; margin: .9rem 0; }
.ad-slot--toast { min-height: 66px; width: 100%; border-radius: 8px; }

.ad-modal { border: 0; padding: 0; border-radius: var(--radius); background: var(--surface);
  color: var(--ink); box-shadow: var(--shadow-lg); max-width: min(94vw, 340px); }
.ad-modal::backdrop { background: rgba(12,14,18,.55); backdrop-filter: blur(2px); }
.ad-modal-inner { position: relative; padding: 1.15rem; }
.ad-modal-close { position: absolute; top: .5rem; right: .5rem; width: 30px; height: 30px;
  border-radius: 8px; display: grid; place-items: center; font-size: .9rem;
  color: var(--ink-soft); background: var(--surface-2); border: 1px solid var(--line); }
.ad-modal-close:hover { color: var(--ink); }
.ad-modal-ok { font-size: .95rem; font-weight: 680; padding-right: 2rem; }
.ad-modal-continue { width: 100%; }

/* Aviso de esquina: pequeno y abajo a la izquierda, para no tapar el boton
   principal de descarga (comprobado en pantalla estrecha). */
.ad-toast { position: fixed; left: .6rem; bottom: .6rem; z-index: 50; width: min(62vw, 232px);
  padding: .4rem; background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; box-shadow: var(--shadow-lg); }
.ad-toast[hidden] { display: none; }
.ad-toast-close { position: absolute; top: -9px; left: -9px; width: 24px; height: 24px;
  border-radius: 50%; display: grid; place-items: center; font-size: .7rem;
  background: var(--ink); color: var(--bg); box-shadow: var(--shadow); }

/* ---------- 8. Secciones ---------- */
.seccion { padding: clamp(2.2rem, 5vw, 3.6rem) 0; }
.seccion--alt { background: var(--surface); border-block: 1px solid var(--line); }
.seccion h2 { margin-bottom: .7rem; }
.seccion-lede { color: var(--ink-soft); max-width: 62ch; margin-bottom: 1.6rem; }
.wrap--texto h2 { margin-bottom: 1rem; }
.wrap--texto h3 { margin: 1.7rem 0 .5rem; }
.wrap--texto p { color: var(--ink-soft); margin-bottom: .85rem; }
.wrap--texto p strong { color: var(--ink); }

.pasos { list-style: none; padding: 0; margin-top: 1.6rem; display: grid; gap: 1rem;
  grid-template-columns: 1fr; counter-reset: paso; }
@media (min-width: 720px) { .pasos { grid-template-columns: repeat(3, 1fr); gap: 1.4rem; } }
.pasos li { position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.4rem 1.2rem 1.2rem; box-shadow: var(--shadow); }
.seccion--alt .pasos li { background: var(--bg); }
.paso-num { position: absolute; top: -14px; left: 1.2rem; width: 30px; height: 30px;
  border-radius: 9px; display: grid; place-items: center; font-weight: 800; font-size: .88rem;
  background: var(--accent); color: var(--accent-ink); }
.paso-ico { width: 30px; height: 30px; color: var(--accent); margin-bottom: .55rem; }
.pasos h3 { margin-bottom: .35rem; }
.pasos p { font-size: .89rem; color: var(--ink-soft); }

.ideas { display: grid; gap: .9rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .ideas { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .ideas { grid-template-columns: repeat(4, 1fr); } }
.idea { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.1rem; transition: transform .2s var(--ease-out), box-shadow .2s var(--ease-out); }
.idea:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.idea-emoji { font-size: 1.5rem; display: block; margin-bottom: .45rem; line-height: 1; }
.idea h3 { margin-bottom: .3rem; font-size: 1rem; }
.idea p { font-size: .85rem; color: var(--ink-soft); }

#faq details { border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg); margin-bottom: .55rem; overflow: hidden; }
#faq summary { padding: .85rem 1rem; font-weight: 620; font-size: .95rem; cursor: pointer;
  list-style: none; display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
#faq summary::-webkit-details-marker { display: none; }
#faq summary::after { content: "+"; font-size: 1.2rem; color: var(--accent); font-weight: 700;
  flex: none; transition: transform .22s var(--ease-out); }
#faq details[open] summary::after { transform: rotate(45deg); }
#faq details p { padding: 0 1rem 1rem; font-size: .89rem; color: var(--ink-soft); margin: 0; }

/* ---------- 9. Pie ---------- */
.site-footer { padding: 2.4rem 0 3rem; border-top: 1px solid var(--line); }
.footer-inner { display: grid; gap: .7rem; }
.footer-brand { font-size: .92rem; color: var(--ink-soft); }
.footer-brand strong { color: var(--ink); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 1.1rem; font-size: .88rem; }
.footer-nav a { color: var(--ink-soft); text-decoration: none; }
.footer-nav a:hover { color: var(--accent); }
.footer-legal { font-size: .78rem; color: var(--ink-faint); max-width: 60ch; }

/* ---------- 10. Responsive ---------- */
@media (max-width: 539px) {
  .header-nav { display: none; }
  .hero { padding-top: 1rem; }
  .lede { font-size: .93rem; line-height: 1.5; margin-bottom: 1rem; }
  .ctl { padding: .9rem; }
  .ctl legend { margin-bottom: .7rem; }
  .seg { margin-bottom: .7rem; }
  .formatos { grid-template-columns: 1fr; }
  .fmt { grid-template-columns: 42px 1fr; justify-items: start; text-align: left;
    align-items: center; column-gap: .7rem; padding: .6rem .8rem; }
  .fmt svg { grid-row: span 2; margin: 0; }
  .ad-toast { left: .5rem; width: min(70vw, 210px); bottom: .5rem; }
}

/* ---------- 11. Movimiento reducido (solo lo intrusivo) ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .idea:hover, .btn:hover, .emoji-btn:hover, .paleta:hover { transform: none; }
}