/* ===========================================================
   QR3D — tokens
   Paleta: papel cuadriculado + azul de plano técnico + naranja
   de impresora (bed/filament), en vez de los defaults típicos.
=========================================================== */
:root {
  --paper: #ECEAE2;
  --paper-line: #D6D2C4;
  --surface: #FFFFFF;
  --ink: #191C1F;
  --ink-soft: #565B5F;
  --blueprint: #2F5AA8;
  --blueprint-dim: #C7D3E6;
  --accent: #FF5A1F;
  --accent-ink: #7A2A0C;
  --good: #1F8A55;
  --warn: #C7511F;
  --bad: #C0392B;

  --display: "Space Grotesk", "Inter", sans-serif;
  --sans: "Inter", "Space Grotesk", sans-serif;
  --mono: "JetBrains Mono", monospace;

  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-soft: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14171A;
    --paper-line: #2A2E33;
    --surface: #1D2023;
    --ink: #F1EFE9;
    --ink-soft: #A7ACB1;
    --blueprint: #7FA3E0;
    --blueprint-dim: #263349;
  }
}

/* ===========================================================
   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: 1.6;
  color: var(--ink);
  background:
    radial-gradient(circle at 1px 1px, var(--paper-line) 1px, transparent 1.2px) 0 0 / 26px 26px,
    var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.05; letter-spacing: -0.01em; font-family: var(--display); }
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--blueprint); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: fixed; top: -100px; left: 1rem;
  padding: .6rem 1rem; background: var(--ink); color: var(--paper);
  z-index: 9999; border-radius: var(--radius-s); font-weight: 600;
}
.skip-link:focus { top: 1rem; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

/* ===========================================================
   Header / Footer
=========================================================== */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--paper-line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-family: var(--display); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; }
.logo::before { content: "▣ "; color: var(--accent); }
.header-nav { display: flex; gap: 1.4rem; font-size: .92rem; font-weight: 500; }
.header-nav a { color: var(--ink-soft); transition: color .2s var(--ease-out); }
.header-nav a:hover { color: var(--ink); }
@media (max-width: 539px) { .header-nav a:not(:last-child) { display: none; } }

.site-footer { border-top: 1px solid var(--paper-line); margin-top: 4rem; padding: 2rem 0; color: var(--ink-soft); font-size: .88rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: .8rem 1.5rem; align-items: center; justify-content: space-between; }
.footer-inner nav { display: flex; gap: 1.2rem; }
.footer-inner a:hover { color: var(--ink); }

/* ===========================================================
   Hero
=========================================================== */
.hero { padding: 2.6rem 20px 1.6rem; text-align: center; }
.hero h1 { font-size: clamp(1.9rem, 4.4vw, 3rem); max-width: 18ch; margin: 0 auto .7rem; }
.hero .subtitle { max-width: 56ch; margin: 0 auto; color: var(--ink-soft); font-size: clamp(1rem, 1.6vw, 1.15rem); }

/* ===========================================================
   Tool card
=========================================================== */
.tool-card {
  max-width: 1120px; margin: 0 auto 2.4rem; padding: 0 20px;
}
.tool-grid {
  background: var(--surface);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-l);
  padding: clamp(16px, 3vw, 28px);
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  position: relative;
}
.tool-grid::before, .tool-grid::after {
  content: ""; position: absolute; width: 14px; height: 14px;
  border: 2px solid var(--blueprint-dim); pointer-events: none;
}
.tool-grid::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; border-radius: 6px 0 0 0; }
.tool-grid::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; border-radius: 0 0 6px 0; }

@media (min-width: 960px) {
  .tool-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}

.field-group { margin-bottom: 1.1rem; }
.field-group.is-hidden { display: none; }
.field-group.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.field-label { display: block; font-size: .82rem; font-weight: 600; margin-bottom: .35rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .04em; }
.field-hint { font-size: .82rem; color: var(--ink-soft); margin-top: .35rem; }

input[type="text"] {
  width: 100%; padding: .7rem .85rem; border: 1.5px solid var(--paper-line);
  border-radius: var(--radius-s); font-size: .95rem; background: var(--paper);
  color: var(--ink); transition: border-color .15s var(--ease-out);
}
input[type="text"]:focus { border-color: var(--blueprint); }

.segmented { display: inline-flex; border: 1.5px solid var(--paper-line); border-radius: 999px; padding: 3px; gap: 3px; }
.segmented-btn { padding: .5rem 1rem; border-radius: 999px; font-size: .88rem; font-weight: 600; color: var(--ink-soft); transition: all .18s var(--ease-out); }
.segmented-btn.is-active { background: var(--ink); color: var(--paper); }

.style-grid, .format-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; }
.format-grid { grid-template-columns: repeat(3, 1fr); }
.chip-btn {
  padding: .6rem .4rem; border: 1.5px solid var(--paper-line); border-radius: var(--radius-s);
  font-size: .82rem; font-weight: 600; text-align: center; color: var(--ink-soft);
  transition: all .16s var(--ease-out);
}
.chip-btn.is-active { border-color: var(--accent); color: var(--accent-ink); background: color-mix(in srgb, var(--accent) 10%, var(--surface)); }
@media (max-width: 539px) { .style-grid { grid-template-columns: repeat(2, 1fr); } }

.color-input { display: flex; align-items: center; gap: .5rem; border: 1.5px solid var(--paper-line); border-radius: var(--radius-s); padding: .4rem .6rem; background: var(--paper); }
.color-input input[type="color"] { width: 30px; height: 30px; border: 0; border-radius: 6px; padding: 0; background: none; }
.color-input span { font-family: var(--mono); font-size: .82rem; color: var(--ink-soft); }

.center-row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.emoji-picker { display: flex; flex-wrap: wrap; gap: .35rem; }
.emoji-btn {
  width: 38px; height: 38px; display: grid; place-items: center;
  border: 1.5px solid var(--paper-line); border-radius: var(--radius-s); font-size: 1.05rem;
  transition: border-color .15s var(--ease-out);
}
.emoji-btn.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--surface)); }
.upload-btn {
  padding: .55rem .9rem; border: 1.5px dashed var(--paper-line); border-radius: var(--radius-s);
  font-size: .85rem; font-weight: 600; color: var(--ink-soft); cursor: pointer;
}
.upload-btn:hover { border-color: var(--blueprint); color: var(--ink); }

.divider { border: 0; border-top: 1px dashed var(--paper-line); margin: 1.4rem 0; }

/* preview column */
.preview-panels { display: grid; gap: .9rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .preview-panels { grid-template-columns: 1fr 1fr; } }
.preview-panel { display: flex; flex-direction: column; gap: .4rem; }
.preview-label { font-size: .82rem; font-weight: 600; color: var(--ink-soft); display: flex; align-items: center; gap: .4rem; }
.badge-soft { font-size: .72rem; font-weight: 600; padding: .15rem .5rem; border-radius: 999px; background: var(--blueprint-dim); color: var(--blueprint); }

.qr-2d-frame, .qr-3d-frame {
  aspect-ratio: 1 / 1; border-radius: var(--radius-m); border: 1px solid var(--paper-line);
  background:
    linear-gradient(var(--paper-line) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px) 0 0 / 20px 20px,
    var(--paper);
  display: grid; place-items: center; overflow: hidden; position: relative;
}
.qr-2d-frame canvas { max-width: 82%; max-height: 82%; border-radius: 4px; box-shadow: 0 6px 20px rgb(0 0 0 / .08); }
.qr-3d-frame canvas { width: 100%; height: 100%; display: block; touch-action: none; }
.qr-3d-status {
  position: absolute; inset: auto 0 10px 0; text-align: center; font-size: .78rem;
  color: var(--ink-soft); pointer-events: none;
}

.print-warnings { display: grid; gap: .4rem; margin-top: .9rem; }
.warning-line {
  font-size: .82rem; padding: .5rem .7rem; border-radius: var(--radius-s);
  border: 1px solid var(--paper-line); display: flex; gap: .5rem; align-items: flex-start;
}
.warning-line.is-good { border-color: color-mix(in srgb, var(--good) 40%, var(--paper-line)); color: var(--good); }
.warning-line.is-warn { border-color: color-mix(in srgb, var(--warn) 40%, var(--paper-line)); color: var(--warn); }
.warning-line.is-bad { border-color: color-mix(in srgb, var(--bad) 40%, var(--paper-line)); color: var(--bad); }

.download-group { margin-top: 1.1rem; display: grid; gap: .55rem; }
.download-row { display: grid; grid-template-columns: 1fr 1fr; gap: .55rem; }

.btn {
  border-radius: var(--radius-s); font-weight: 700; padding: .75rem 1.1rem; font-size: .92rem;
  transition: transform .15s var(--ease-out), box-shadow .15s var(--ease-out), opacity .15s;
  text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px color-mix(in srgb, var(--accent) 45%, transparent); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-big { font-size: 1rem; padding: .95rem 1.2rem; }
.btn-secondary { background: var(--paper); border: 1.5px solid var(--paper-line); color: var(--ink); }
.btn-secondary:hover { border-color: var(--blueprint); }
.btn-link { background: none; color: var(--ink-soft); font-weight: 600; font-size: .84rem; text-decoration: underline; text-underline-offset: 3px; }

.privacy-badge { font-size: .84rem; color: var(--ink-soft); margin-top: 1rem; }

/* ===========================================================
   Ad slots (placeholders only)
=========================================================== */
.ad-slot {
  max-width: 1120px; margin: 1.6rem auto; min-height: 90px;
  border: 1.5px dashed var(--paper-line); border-radius: var(--radius-m);
  display: grid; place-items: center; background: color-mix(in srgb, var(--paper-line) 25%, transparent);
}
.ad-slot-label { font-family: var(--mono); font-size: .78rem; letter-spacing: .1em; color: var(--ink-soft); text-transform: uppercase; }
.ad-slot--leaderboard { min-height: 90px; margin-left: 20px; margin-right: 20px; }
.ad-slot--incontent { min-height: 250px; margin-left: 20px; margin-right: 20px; }
.ad-slot--popup { min-height: 200px; width: 100%; }

/* ===========================================================
   Content sections
=========================================================== */
.content-section { padding: 2.4rem 20px; }
.content-section h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); margin-bottom: 1.4rem; }
.text-block p { max-width: 72ch; color: var(--ink-soft); margin-bottom: 1rem; }
.text-block p strong { color: var(--ink); }

.steps-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .steps-grid { grid-template-columns: repeat(3, 1fr); } }
.step-card { background: var(--surface); border: 1px solid var(--paper-line); border-radius: var(--radius-m); padding: 1.3rem; }
.step-icon { color: var(--blueprint); margin-bottom: .8rem; }
.step-card h3 { font-size: 1.05rem; margin-bottom: .4rem; }
.step-card p { color: var(--ink-soft); font-size: .92rem; }

.usecases-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .usecases-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1280px) { .usecases-grid { grid-template-columns: repeat(3, 1fr); } }
.usecase-card { border: 1px solid var(--paper-line); border-radius: var(--radius-m); padding: 1.1rem; background: var(--surface); }
.usecase-card h3 { font-size: 1rem; margin-bottom: .4rem; color: var(--accent-ink); }
.usecase-card p { font-size: .9rem; color: var(--ink-soft); }

.faq-list { display: grid; gap: .6rem; max-width: 80ch; }
.faq-item { border: 1px solid var(--paper-line); border-radius: var(--radius-m); background: var(--surface); overflow: hidden; }
.faq-item summary { padding: 1rem 1.2rem; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--accent); font-size: 1.2rem; flex-shrink: 0; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding: 0 1.2rem 1.1rem; color: var(--ink-soft); font-size: .93rem; }

/* ===========================================================
   Popup / corner toast
=========================================================== */
.download-dialog { border: 0; border-radius: var(--radius-l); padding: 0; max-width: 420px; width: calc(100% - 40px); box-shadow: 0 24px 60px rgb(0 0 0 / .25); }
.download-dialog::backdrop { background: rgb(20 20 20 / .5); }
.download-dialog-inner { padding: 1.4rem; position: relative; }
.dialog-close { position: absolute; top: .6rem; right: .6rem; width: 32px; height: 32px; border-radius: 999px; font-size: 1.2rem; background: var(--paper); }
.download-dialog .ad-slot { margin: .6rem 0 1rem; }
.download-dialog .btn { width: 100%; }

.corner-toast {
  position: fixed; right: 16px; bottom: 16px; z-index: 60;
  background: var(--surface); border: 1.5px dashed var(--paper-line); border-radius: var(--radius-m);
  padding: .8rem 2.2rem .8rem 1rem; box-shadow: 0 10px 30px rgb(0 0 0 / .15);
  min-width: 220px; min-height: 60px; display: flex; align-items: center;
  animation: toast-in .4s var(--ease-out);
}
@keyframes toast-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.corner-toast-close { position: absolute; top: .5rem; right: .6rem; font-size: 1rem; color: var(--ink-soft); }