/* QR a Medida — hoja de estilos única */
:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f0f2f6;
  --text: #16181d;
  --muted: #5b6270;
  --border: #dde1e8;
  --accent: #2f5bea;
  --accent-ink: #ffffff;
  --accent-soft: #e6ecfd;
  --ok: #16794a;
  --ok-soft: #e3f4ea;
  --warn: #9a5b00;
  --warn-soft: #fdf1dc;
  --err: #b42318;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 4px 16px rgba(16, 24, 40, .06);
  --maxw: 1180px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115; --surface: #171a21; --surface-2: #1f232c; --text: #e8eaef; --muted: #a3a9b6;
    --border: #2c313c; --accent: #7c9cff; --accent-ink: #0b1020; --accent-soft: #1e2742;
    --ok: #5fd39a; --ok-soft: #12291e; --warn: #f2b95c; --warn-soft: #2d2412; --err: #ff8a80;
    --shadow: 0 1px 2px rgba(0,0,0,.4); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1115; --surface: #171a21; --surface-2: #1f232c; --text: #e8eaef; --muted: #a3a9b6;
  --border: #2c313c; --accent: #7c9cff; --accent-ink: #0b1020; --accent-soft: #1e2742;
  --ok: #5fd39a; --ok-soft: #12291e; --warn: #f2b95c; --warn-soft: #2d2412; --err: #ff8a80;
  --shadow: 0 1px 2px rgba(0,0,0,.4); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
img, svg, canvas, video { max-width: 100%; }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(1.6rem, 4.2vw, 2.3rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.25rem, 3vw, 1.55rem); margin-top: 1.8em; }
h3 { font-size: 1.1rem; margin-top: 1.4em; }
p, ul, ol { margin: 0 0 1em; }
code { background: var(--surface-2); padding: .1em .35em; border-radius: 5px; font-size: .92em; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; z-index: 50; background: var(--surface); padding: 8px 12px; border-radius: 8px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* Cabecera */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.header-in { max-width: var(--maxw); margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 750; color: var(--text); text-decoration: none; font-size: 1.1rem; }
.brand svg { width: 28px; height: 28px; }
.nav { margin-left: auto; display: flex; gap: 4px; align-items: center; }
.nav-links { display: flex; gap: 2px; list-style: none; margin: 0; padding: 0; }
.nav-links a { display: block; padding: 7px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: .95rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
.lang-switch { display: inline-grid; place-items: center; min-width: 38px; height: 38px; padding: 0 8px; border: 1px solid var(--border); border-radius: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: .85rem; letter-spacing: .04em; }
.lang-switch:hover { border-color: var(--accent); color: var(--accent); }
.icon-btn { border: 1px solid var(--border); background: var(--surface); color: var(--text); width: 38px; height: 38px; border-radius: 10px; cursor: pointer; display: inline-grid; place-items: center; }
.icon-btn svg { width: 19px; height: 19px; }
.menu-btn { display: none; }
@media (max-width: 900px) {
  .menu-btn { display: inline-grid; }
  .nav-links { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--surface); border-bottom: 1px solid var(--border); flex-direction: column; padding: 8px 16px 14px; }
  .nav-links.open { display: flex; }
}

/* Estructura */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 20px 16px 48px; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; }
@media (min-width: 1100px) { .layout.has-aside { grid-template-columns: minmax(0, 1fr) 300px; } }
.aside { display: none; }
@media (min-width: 1100px) { .aside { display: block; } .aside .sticky { position: sticky; top: 80px; } }
.crumbs { font-size: .88rem; color: var(--muted); margin-bottom: 10px; }
.crumbs ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs li + li::before { content: "›"; margin-right: 6px; }
.crumbs a { color: var(--muted); }
.lead { font-size: 1.08rem; color: var(--muted); max-width: 70ch; }
.prose { max-width: 75ch; }
.prose li { margin-bottom: .35em; }

/* Tarjetas y herramienta */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.tool { display: grid; gap: 20px; grid-template-columns: minmax(0, 1fr); margin: 18px 0 8px; }
@media (min-width: 820px) { .tool { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); align-items: start; } }
.tool-3 { grid-template-areas: "form" "prev" "style"; }
.tool-3 .t-form { grid-area: form; } .tool-3 .t-prev { grid-area: prev; } .tool-3 .t-style { grid-area: style; }
@media (min-width: 820px) {
  .tool-3 { grid-template-areas: "form prev" "style prev"; grid-template-rows: auto 1fr; row-gap: 14px; }
  .tool-3 .t-prev { align-self: stretch; } .tool-3 .t-prev .preview { position: sticky; top: 76px; }
}
.tool .preview { display: flex; flex-direction: column; align-items: center; gap: 12px; }
@media (min-width: 820px) { .tool .preview { position: sticky; top: 76px; } }
.qr-box { width: 100%; max-width: 300px; aspect-ratio: 1; display: grid; place-items: center; background: var(--surface-2); border-radius: 10px; overflow: hidden; }
.qr-box > svg, .qr-box > canvas { width: 100% !important; height: auto !important; display: block; }
.qr-empty { color: var(--muted); font-size: .92rem; text-align: center; padding: 20px; }

.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }
.field > label, .label { font-weight: 600; font-size: .93rem; }
.hint { font-size: .84rem; color: var(--muted); }
.row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
input[type="text"], input[type="url"], input[type="email"], input[type="tel"], input[type="number"], input[type="password"], select, textarea {
  width: 100%; font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 9px; padding: 9px 11px; min-height: 42px;
}
textarea { min-height: 90px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
input[type="color"] { width: 46px; height: 38px; border: 1px solid var(--border); border-radius: 8px; padding: 2px; background: var(--surface); cursor: pointer; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.check { display: flex; align-items: center; gap: 8px; font-size: .95rem; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.color-row { display: flex; align-items: center; gap: 8px; }
.color-row input[type="text"] { max-width: 110px; font-family: ui-monospace, monospace; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; font: inherit; font-weight: 600; border-radius: 10px; padding: 10px 16px; min-height: 44px; cursor: pointer; border: 1px solid var(--border); background: var(--surface); color: var(--text); text-decoration: none; }
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.07); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

.tabs { display: flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: 11px; margin-bottom: 16px; flex-wrap: wrap; }
.tabs button { flex: 1; font: inherit; font-weight: 600; font-size: .93rem; border: 0; background: transparent; color: var(--muted); padding: 8px 10px; border-radius: 8px; cursor: pointer; min-height: 40px; }
@media (max-width: 480px) { .tabs button { padding: 8px 4px; font-size: .86rem; } }
.tabs button[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

details.panel { border: 1px solid var(--border); border-radius: 10px; margin-bottom: 12px; background: var(--surface); }
details.panel > summary { cursor: pointer; padding: 11px 14px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; }
details.panel > summary::after { content: "+"; color: var(--muted); font-weight: 400; }
details.panel[open] > summary::after { content: "–"; }
details.panel > .panel-body { padding: 4px 14px 14px; }

.style-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(78px, 1fr)); gap: 8px; }
.style-opt { border: 2px solid var(--border); border-radius: 10px; background: var(--surface); padding: 6px; cursor: pointer; font: inherit; font-size: .78rem; color: var(--muted); display: flex; flex-direction: column; align-items: center; gap: 4px; }
.style-opt svg { width: 38px; height: 38px; }
.style-opt[aria-pressed="true"] { border-color: var(--accent); color: var(--text); }

.status { font-size: .9rem; padding: 8px 12px; border-radius: 9px; width: 100%; text-align: center; }
.status.ok { background: var(--ok-soft); color: var(--ok); }
.status.warn { background: var(--warn-soft); color: var(--warn); }
.status.err { background: var(--warn-soft); color: var(--err); }
.status:empty { display: none; }
.meta { font-size: .82rem; color: var(--muted); text-align: center; }

/* Huecos de anuncio: altura reservada para evitar CLS */
.ad-slot { display: block; min-height: 280px; margin: 36px 0; background: transparent; position: relative; }
.ad-slot::before { content: "Publicidad"; position: absolute; top: -18px; left: 0; font-size: .72rem; color: var(--muted); letter-spacing: .04em; text-transform: uppercase; }
html[lang="en"] .ad-slot::before { content: "Advertisement"; }
.ad-slot.ad-aside { min-height: 600px; margin: 0; }
@media (max-width: 600px) { .ad-slot { min-height: 250px; } }

/* Contenido */
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; position: relative; padding-left: 42px; margin-bottom: 12px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 700; display: grid; place-items: center; font-size: .9rem; }
.faq details { border-bottom: 1px solid var(--border); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 8px 0 0; color: var(--muted); }
.note { background: var(--accent-soft); border-radius: 10px; padding: 12px 14px; font-size: .95rem; }
.grid-tools { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); margin: 16px 0; }
.tool-card { display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; transition: border-color .15s, transform .15s; }
.tool-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.tool-card strong { font-size: 1.03rem; }
.tool-card span { color: var(--muted); font-size: .92rem; }
.tool-card .ico { width: 36px; height: 36px; border-radius: 9px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; }
.tool-card .ico svg { width: 20px; height: 20px; }
.hero { padding: 18px 0 6px; }
.table { width: 100%; border-collapse: collapse; font-size: .94rem; margin-bottom: 1em; }
.table th, .table td { border-bottom: 1px solid var(--border); padding: 8px 6px; text-align: left; vertical-align: top; }
.table-wrap { overflow-x: auto; }

/* Lector */
.drop { border: 2px dashed var(--border); border-radius: 12px; padding: 26px 16px; text-align: center; color: var(--muted); cursor: pointer; }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.video-box { position: relative; width: 100%; max-width: 420px; margin: 0 auto; border-radius: 12px; overflow: hidden; background: #000; aspect-ratio: 1; }
.video-box video { width: 100%; height: 100%; object-fit: cover; display: block; }
.video-box .frame { position: absolute; inset: 15%; border: 3px solid rgba(255,255,255,.85); border-radius: 14px; box-shadow: 0 0 0 999px rgba(0,0,0,.25); }
.result { word-break: break-all; background: var(--surface-2); border-radius: 10px; padding: 12px; font-family: ui-monospace, monospace; font-size: .92rem; white-space: pre-wrap; }
.hidden { display: none !important; }

/* Código de barras */
.bc-box { width: 100%; min-height: 160px; display: grid; place-items: center; background: #fff; border-radius: 10px; padding: 10px; overflow-x: auto; }

/* Pie */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); font-size: .92rem; color: var(--muted); }
.footer-in { max-width: var(--maxw); margin: 0 auto; padding: 28px 16px; display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.site-footer h2 { font-size: .95rem; margin: 0 0 8px; color: var(--text); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 5px; }
.site-footer a { color: var(--muted); }
.footer-note { max-width: var(--maxw); margin: 0 auto; padding: 0 16px 24px; font-size: .8rem; }
.linklike { background: none; border: 0; padding: 0; font: inherit; color: var(--muted); text-decoration: underline; cursor: pointer; }