/* =============================================================
   1. Tokens
   ============================================================= */
:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --surface-2: #f0eee9;
  --text: #17171a;
  --text-soft: #55565c;
  --border: #e2e0da;
  --accent: #2f6f4f;
  --accent-strong: #1f5138;
  --accent-contrast: #ffffff;
  --warn-bg: #fff6e3;
  --warn-text: #7a5a00;
  --bad-bg: #fdeceb;
  --bad-text: #a32b1f;
  --info-bg: #eef3ff;
  --info-text: #2b4b8f;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
  --shadow-1: 0 1px 2px rgba(20, 20, 20, 0.06), 0 6px 20px -8px rgba(20, 20, 20, 0.12);
  --sans: "Manrope", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14151a;
    --surface: #1b1c22;
    --surface-2: #22232b;
    --text: #f1f1ee;
    --text-soft: #a9aab3;
    --border: #33343c;
    --accent: #59b98a;
    --accent-strong: #79d1a5;
    --accent-contrast: #0c130f;
    --warn-bg: #3a3115;
    --warn-text: #ffd873;
    --bad-bg: #3a1c1a;
    --bad-text: #ff8b7d;
    --info-bg: #1a2438;
    --info-text: #9db8ff;
  }
}
:root[data-theme="dark"] {
  --bg: #14151a;
  --surface: #1b1c22;
  --surface-2: #22232b;
  --text: #f1f1ee;
  --text-soft: #a9aab3;
  --border: #33343c;
  --accent: #59b98a;
  --accent-strong: #79d1a5;
  --accent-contrast: #0c130f;
  --warn-bg: #3a3115;
  --warn-text: #ffd873;
  --bad-bg: #3a1c1a;
  --bad-text: #ff8b7d;
  --info-bg: #1a2438;
  --info-text: #9db8ff;
}

/* =============================================================
   2. Reset
   ============================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; tab-size: 2; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  overscroll-behavior-y: none;
}
img, svg, video, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; }
a { color: inherit; }
p { text-wrap: pretty; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; letter-spacing: -0.01em; font-weight: 800; }
::selection { background: var(--accent); color: var(--accent-contrast); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.container { width: 100%; max-width: 1120px; margin-inline: auto; padding-inline: 1.25rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: -100px; left: 1rem; padding: .6rem 1rem;
  background: var(--surface); color: var(--text); z-index: 9999;
  border-radius: 8px; font-weight: 600; box-shadow: var(--shadow-1);
  transition: top .2s var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* =============================================================
   3. Header / footer
   ============================================================= */
.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: .9rem; }
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 800; font-size: 1.1rem; text-decoration: none; }
.brand__mark { color: var(--accent); font-size: 1.3rem; }
.site-header__claim { color: var(--text-soft); font-size: .85rem; display: none; }
@media (min-width: 540px) { .site-header__claim { display: block; } }

.site-footer { border-top: 1px solid var(--border); margin-top: 3rem; padding-block: 1.5rem; color: var(--text-soft); font-size: .9rem; }
.site-footer__inner { display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; align-items: center; justify-content: space-between; }
.site-footer__links { display: flex; gap: 1.25rem; }
.site-footer__links a { text-decoration: none; }
.site-footer__links a:hover { color: var(--accent); }

/* =============================================================
   4. Hero
   ============================================================= */
.hero { padding-block: 2.4rem 1.6rem; text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 4.6vw, 2.7rem); max-width: 22ch; margin-inline: auto; }
.hero__subtitle { color: var(--text-soft); max-width: 56ch; margin: .9rem auto 0; font-size: 1.05rem; }

/* =============================================================
   5. Tool card
   ============================================================= */
.tool-card { background: var(--surface); border-block: 1px solid var(--border); padding-block: 1.8rem 2.4rem; }
.tool-card__grid { display: grid; gap: 1.75rem; grid-template-columns: 1fr; }
@media (min-width: 960px) { .tool-card__grid { grid-template-columns: 1fr 1fr; align-items: start; } }
.tool-card__col--preview { display: flex; flex-direction: column; align-items: center; gap: 1rem; }

.field-group { margin-bottom: 1.35rem; }
.field-group--row { display: flex; gap: 1.5rem; }
.field-label { display: block; font-weight: 700; font-size: .9rem; margin-bottom: .4rem; }
.field-hint { color: var(--text-soft); font-size: .82rem; margin-top: .4rem; }

.mode-tabs { display: flex; gap: .5rem; margin-bottom: 1rem; }
.mode-tab {
  flex: 1; padding: .55rem .8rem; border: 1px solid var(--border); background: var(--surface-2);
  border-radius: var(--radius-s); font-weight: 600; transition: background .15s var(--ease-out), color .15s var(--ease-out);
}
.mode-tab.is-active { background: var(--accent); color: var(--accent-contrast); border-color: var(--accent); }

.text-input {
  width: 100%; padding: .75rem .9rem; border: 1px solid var(--border); border-radius: var(--radius-s);
  background: var(--surface); color: var(--text); font-size: 1rem; font-family: inherit;
}
.text-input:focus-visible { border-color: var(--accent); }

.style-presets { display: flex; flex-wrap: wrap; gap: .5rem; }
.style-btn, .format-btn {
  padding: .55rem .95rem; border: 1px solid var(--border); background: var(--surface-2);
  border-radius: 999px; font-weight: 600; font-size: .9rem; transition: transform .15s var(--ease-out), background .15s var(--ease-out);
}
.style-btn.is-active, .format-btn.is-active { background: var(--accent); color: var(--accent-contrast); border-color: var(--accent); }
.style-btn:hover, .format-btn:hover { transform: translateY(-1px); }

input[type="color"] {
  width: 100%; height: 44px; border: 1px solid var(--border); border-radius: var(--radius-s);
  padding: 3px; background: var(--surface); cursor: pointer;
}

.emoji-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: .35rem; margin-bottom: .7rem; }
@media (max-width: 420px) { .emoji-grid { grid-template-columns: repeat(6, 1fr); } }
.emoji-btn {
  aspect-ratio: 1; border: 1px solid var(--border); background: var(--surface-2); border-radius: var(--radius-s);
  font-size: 1.2rem; display: flex; align-items: center; justify-content: center; transition: background .15s var(--ease-out);
}
.emoji-btn.is-active { background: var(--accent); border-color: var(--accent); }
.center-upload { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }

.warn { padding: .6rem .8rem; border-radius: var(--radius-s); font-size: .88rem; margin-bottom: .5rem; }
.warn--bad { background: var(--bad-bg); color: var(--bad-text); }
.warn--warn { background: var(--warn-bg); color: var(--warn-text); }

.qr-preview {
  width: 100%; max-width: 380px; aspect-ratio: 1; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius-l); display: flex; align-items: center; justify-content: center; padding: 1rem; overflow: hidden;
}
.qr-preview canvas { width: 100%; height: 100%; border-radius: var(--radius-m); }
.qr-empty { color: var(--text-soft); text-align: center; font-size: .92rem; padding: 1.5rem; }

.download-row { display: flex; flex-wrap: wrap; gap: .7rem; width: 100%; max-width: 380px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .75rem 1.3rem; border-radius: 999px; font-weight: 700; font-size: .95rem;
  border: 1px solid transparent; transition: transform .15s var(--ease-out), background .15s var(--ease-out);
  flex: 1;
}
.btn--primary { background: var(--accent); color: var(--accent-contrast); }
.btn--primary:hover { transform: translateY(-1px); background: var(--accent-strong); }
.btn--ghost { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn--ghost:hover { transform: translateY(-1px); }
.btn--small { padding: .5rem .9rem; font-size: .85rem; flex: 0; }
.btn-link { margin-top: .7rem; background: none; border: none; text-decoration: underline; color: var(--text-soft); font-size: .88rem; }
.btn-link:hover { color: var(--accent); }

.section-divider { border-top: 1px dashed var(--border); padding-top: 1.8rem; margin-top: 2.2rem; text-align: center; }
.section-divider h2 { font-size: 1.5rem; }
.section-divider__sub { color: var(--text-soft); max-width: 52ch; margin: .5rem auto 0; }

.print3d-grid { display: grid; gap: 1.75rem; grid-template-columns: 1fr; margin-top: 1.6rem; }
@media (min-width: 960px) { .print3d-grid { grid-template-columns: 1fr 1fr; align-items: start; } }
.format-btns { display: flex; flex-wrap: wrap; gap: .6rem; }
.format-btn { display: inline-flex; align-items: center; gap: .45rem; }
.format-btn__icon { font-size: 1.1rem; }
.module-size-info { color: var(--text-soft); font-size: .85rem; margin-bottom: .8rem; }

.viewer-wrap {
  position: relative; width: 100%; aspect-ratio: 1; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: var(--radius-l); overflow: hidden;
}
.viewer-canvas { width: 100%; height: 100%; touch-action: none; cursor: grab; }
.viewer-canvas:active { cursor: grabbing; }
.viewer-hint {
  position: absolute; bottom: .6rem; left: 50%; transform: translateX(-50%);
  font-size: .78rem; color: var(--text-soft); background: color-mix(in srgb, var(--surface) 80%, transparent);
  padding: .3rem .7rem; border-radius: 999px; pointer-events: none;
}
.viewer-fallback { padding: 2rem; text-align: center; color: var(--text-soft); }

/* =============================================================
   6. Ad slots (placeholders)
   ============================================================= */
.ad-slot {
  display: flex; align-items: center; justify-content: center; min-height: 90px;
  border: 1px dashed var(--border); border-radius: var(--radius-s); background: var(--surface-2);
  color: var(--text-soft); margin-block: 2rem;
}
.ad-slot__label { font-size: .78rem; letter-spacing: .12em; font-weight: 700; text-transform: uppercase; }
.ad-slot--banner { min-height: 100px; }
.ad-slot--incontent { min-height: 250px; max-width: 728px; }
.ad-slot--popup { min-height: 250px; width: 100%; margin: 0; }

.ad-toast {
  position: fixed; bottom: 1rem; right: 1rem; width: 220px; min-height: 90px;
  background: var(--surface); border: 1px dashed var(--border); border-radius: var(--radius-s);
  box-shadow: var(--shadow-1); display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(12px); pointer-events: none; transition: opacity .3s var(--ease-out), transform .3s var(--ease-out);
  z-index: 40;
}
.ad-toast.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.ad-toast__close {
  position: absolute; top: .3rem; right: .3rem; width: 22px; height: 22px; border-radius: 50%;
  background: var(--surface-2); border: 1px solid var(--border); font-size: 1rem; line-height: 1;
}

.ad-dialog { border: none; border-radius: var(--radius-m); padding: 0; max-width: min(90vw, 380px); background: var(--surface); box-shadow: var(--shadow-1); }
.ad-dialog::backdrop { background: rgba(10, 10, 12, 0.55); }
.ad-dialog__inner { position: relative; padding: 1.4rem; }
.ad-dialog__close {
  position: absolute; top: .6rem; right: .6rem; width: 30px; height: 30px; border-radius: 50%;
  background: var(--surface-2); border: 1px solid var(--border); font-size: 1.1rem;
}

/* =============================================================
   7. How it works / ideas / FAQ / SEO text
   ============================================================= */
.how-it-works, .use-ideas, .seo-text, .faq { padding-block: 2.6rem; }
.how-it-works h2, .use-ideas h2, .seo-text h2, .faq h2 { text-align: center; font-size: 1.7rem; margin-bottom: 1.8rem; }

.steps { display: grid; gap: 1.4rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m); padding: 1.4rem; }
.step__num {
  width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: var(--accent-contrast);
  display: flex; align-items: center; justify-content: center; font-weight: 800; margin-bottom: .8rem;
}
.step h3 { font-size: 1.05rem; margin-bottom: .4rem; }
.step p { color: var(--text-soft); font-size: .92rem; }

.idea-grid { display: grid; gap: 1.2rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .idea-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .idea-grid { grid-template-columns: repeat(3, 1fr); } }
.idea-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-m); padding: 1.3rem; }
.idea-card__emoji { font-size: 1.6rem; margin-bottom: .6rem; }
.idea-card h3 { font-size: 1rem; margin-bottom: .35rem; }
.idea-card p { color: var(--text-soft); font-size: .9rem; }

.seo-text { max-width: 780px; margin-inline: auto; }
.seo-text p { margin-bottom: 1rem; color: var(--text-soft); }
.seo-text h2 { text-align: left; }

.faq-list { max-width: 780px; margin-inline: auto; display: flex; flex-direction: column; gap: .6rem; }
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-s); padding: .9rem 1.1rem; }
.faq-item summary { cursor: pointer; font-weight: 700; }
.faq-item p { color: var(--text-soft); margin-top: .6rem; font-size: .93rem; }

/* =============================================================
   8. No-JS fallback
   ============================================================= */
html:not(.is-ready) .tool-card::after {
  content: "Esta herramienta necesita JavaScript activado para generar el código QR.";
}