/* =============================================================
   ¿Cuánto me tomaría? — hoja de estilos única
   Identidad: la ficha de préstamo de una biblioteca.
   Papel de libro mayor, tinta de sello violeta, etiquetas a máquina.

   1 Tokens · 2 Reset · 3 Utilidades · 4 Tipografía · 5 Componentes
   6 Secciones · 7 Anuncios · 8 Responsive · 9 Reduced motion
   ============================================================= */

/* ---------- 1. Tokens ---------- */
:root {
  --papel:  #edefe8;   /* papel de libro mayor */
  --ficha:  #fbfcf7;   /* cartulina de la ficha */
  --tinta:  #1a1c19;
  --tinta-2:#5c6157;
  --tinta-3:#8a9081;
  --regla:  #d3d8ca;
  --sello:  #5b3ba6;   /* tinta del sello */
  --sello-2:#ece6f9;
  --vencido:#b03a2e;   /* solo para avisos */

  --display: "Bricolage Grotesque", "Trebuchet MS", sans-serif;
  --sans: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Courier Prime", ui-monospace, "Courier New", monospace;

  --r: 5px;
  --gutter: clamp(1rem, 4vw, 2rem);
  --maxw: 62rem;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --papel:  #14160f;
    --ficha:  #1d2018;
    --tinta:  #eff1e6;
    --tinta-2:#9aa090;
    --tinta-3:#6e7466;
    --regla:  #333829;
    --sello:  #b49bf5;
    --sello-2:#241d38;
    --vencido:#e2705f;
  }
}
:root[data-theme="dark"] {
  --papel:  #14160f;
  --ficha:  #1d2018;
  --tinta:  #eff1e6;
  --tinta-2:#9aa090;
  --tinta-3:#6e7466;
  --regla:  #333829;
  --sello:  #b49bf5;
  --sello-2:#241d38;
  --vencido:#e2705f;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--tinta);
  background: var(--papel);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
a { color: inherit; }
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; line-height: 1.05; }
::selection { background: var(--sello); color: var(--papel); }
:focus-visible { outline: 2px solid var(--sello); outline-offset: 3px; }

/* ---------- 3. Utilidades ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.skip-link {
  position: fixed; top: -100px; left: 1rem; z-index: 999;
  background: var(--tinta); color: var(--papel);
  padding: .6rem 1rem; font-weight: 700;
}
.skip-link:focus { top: 1rem; }
[hidden] { display: none !important; }

/* etiqueta a máquina: la voz de la ficha */
.sello-txt {
  font-family: var(--mono); font-weight: 700;
  font-size: .72rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--tinta-3);
}

/* ---------- 4. Tipografía ---------- */
h1 {
  font-family: var(--display); font-weight: 800;
  font-size: clamp(1.7rem, 5.6vw, 3.3rem); letter-spacing: -0.035em;
}
h2 {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2rem); letter-spacing: -0.03em;
}
h3 { font-family: var(--display); font-size: 1.06rem; font-weight: 700; letter-spacing: -0.02em; }

/* ---------- 5. Componentes ---------- */
.site-header { border-bottom: 1px solid var(--regla); background: var(--papel); position: sticky; top: 0; z-index: 20; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: .8rem; }
.logo { display: inline-flex; align-items: center; gap: .55rem; text-decoration: none; }
.logo-mark { display: block; width: 26px; height: 26px; color: var(--sello); }
.logo-mark svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.7; }
.logo-text { font-family: var(--display); font-weight: 700; font-size: 1rem; letter-spacing: -0.03em; white-space: nowrap; }
.header-note { display: none; font-family: var(--mono); font-weight: 700; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--tinta-3); white-space: nowrap; }

.hero { padding-block: clamp(1.1rem, 4vw, 2.6rem) 1rem; }
.hero-sub { margin-top: .7rem; font-size: clamp(.98rem, 2.2vw, 1.15rem); color: var(--tinta-2); max-width: 40rem; }

/* --- la ficha --- */
.tool-wrap { padding-bottom: 1rem; }
.tool-card {
  background: var(--ficha);
  border: 1.5px solid var(--tinta);
  border-radius: var(--r);
  padding: clamp(1.05rem, 3.5vw, 1.9rem);
  box-shadow: 4px 4px 0 var(--regla);
}
.noscript-msg { background: var(--sello-2); padding: .8rem 1rem; margin-bottom: 1rem; }

.tool-form { display: grid; gap: 1.2rem; }
.field { display: grid; gap: .45rem; border: 0; padding: 0; }
.field > label, .field legend, .pace-label {
  font-family: var(--mono); font-weight: 700;
  font-size: .74rem; letter-spacing: .13em; text-transform: uppercase; color: var(--tinta-2);
}
.opt { color: var(--tinta-3); }
.row { display: grid; gap: 1.2rem; }

input[type="text"], input[type="number"] {
  width: 100%;
  font-family: var(--display); font-weight: 600;
  font-size: 1.3rem;
  padding: .6rem .7rem;
  color: var(--tinta);
  background: transparent;
  border: 0; border-bottom: 2px solid var(--regla);
  border-radius: 0;
  transition: border-color .2s var(--ease);
}
input:focus { border-bottom-color: var(--sello); outline: none; }
input::placeholder { color: var(--tinta-3); font-weight: 400; }
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; appearance: textfield; }

.input-unit { position: relative; }
.input-unit .unit {
  position: absolute; right: .2rem; bottom: .75rem;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .06em;
  color: var(--tinta-3); pointer-events: none;
}
.input-unit input { padding-right: 5.5rem; }

/* selector de formato */
.segmented { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1.5px solid var(--regla); border-radius: var(--r); overflow: hidden; }
.segmented--small { grid-template-columns: repeat(2, minmax(0, 7rem)); width: fit-content; }
.seg input { position: absolute; opacity: 0; width: 0; height: 0; }
.seg + .seg span { border-left: 1.5px solid var(--regla); }
.seg span {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .3rem;
  padding: .7rem .4rem; text-align: center;
  font-weight: 600; font-size: .92rem;
  transition: background .18s var(--ease), color .18s var(--ease);
}
.segmented--small .seg span { flex-direction: row; padding: .6rem .5rem; }
.seg svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.seg input:checked + span { background: var(--sello); color: var(--papel); }
.seg input:focus-visible + span { outline: 2px solid var(--sello); outline-offset: -3px; }
.seg:hover input:not(:checked) + span { background: var(--sello-2); }

/* chips de ritmo */
.chips { display: grid; grid-template-columns: repeat(3, 1fr); gap: .4rem; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; width: 0; height: 0; }
.chip span {
  display: flex; flex-direction: column; align-items: center; gap: .05rem;
  padding: .5rem .35rem; text-align: center;
  border: 1.5px solid var(--regla); border-radius: var(--r);
  font-size: .9rem; font-weight: 600;
  transition: border-color .18s var(--ease), background .18s var(--ease), color .18s var(--ease);
}
.chip small { font-family: var(--mono); font-weight: 400; color: var(--tinta-3); font-size: .74rem; }
.chip input:checked + span { border-color: var(--sello); background: var(--sello-2); color: var(--sello); }
.chip input:checked + span small { color: inherit; }
.chip input:focus-visible + span { outline: 2px solid var(--sello); outline-offset: 2px; }

.field--weekend { gap: .6rem; }
.weekend-extra { display: grid; gap: .3rem; padding-top: .2rem; max-width: 18rem; animation: slide .28s var(--ease); }
@keyframes slide { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

/* --- el resguardo (resultado) --- */
.result { margin-top: 1.6rem; }
.result-empty, .result-error { color: var(--tinta-2); font-size: .95rem; text-align: center; padding-top: 1.2rem; border-top: 2px dashed var(--regla); }
.result-error { color: var(--vencido); font-weight: 600; }

.result-card {
  position: relative;
  border-top: 2px dashed var(--regla);
  padding-top: 1.6rem;
  animation: pop .3s var(--ease);
}
/* muescas de troquel */
.result-card::before, .result-card::after {
  content: ""; position: absolute; top: -12px; width: 22px; height: 22px;
  border-radius: 50%; background: var(--papel);
  border: 1.5px solid var(--tinta);
}
.result-card::before { left: calc(-1 * clamp(1.05rem, 3.5vw, 1.9rem) - 12px); }
.result-card::after { right: calc(-1 * clamp(1.05rem, 3.5vw, 1.9rem) - 12px); }
@keyframes pop { from { opacity: 0; } to { opacity: 1; } }

.result-title { font-family: var(--mono); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; color: var(--tinta-2); }
.result-big {
  font-family: var(--display); font-weight: 800;
  font-size: clamp(3.4rem, 15vw, 6rem); line-height: .95;
  letter-spacing: -0.055em; color: var(--sello);
  margin-top: .3rem;
  font-variant-numeric: tabular-nums;
}
.result-big span:last-child { font-size: .3em; color: var(--tinta); letter-spacing: -0.02em; }
.result-sub { color: var(--tinta-2); font-size: 1rem; margin-top: .1rem; }

.pace-box { margin-top: 1.3rem; padding-top: 1rem; border-top: 1px solid var(--regla); }
.pace-tag { display: block; font-family: var(--mono); font-weight: 700; font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--tinta-3); }
.pace-main { font-family: var(--display); font-weight: 700; font-size: clamp(1.35rem, 5vw, 1.9rem); letter-spacing: -0.03em; margin-top: .15rem; }
.pace-extra { font-size: .92rem; color: var(--tinta-2); margin-top: .2rem; }

.result-meta { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin-top: 1.2rem; padding-top: 1rem; border-top: 1px solid var(--regla); }
.result-meta dt { font-family: var(--mono); font-weight: 700; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--tinta-3); }
.result-meta dd { font-family: var(--display); font-weight: 700; font-size: 1.15rem; margin-top: .1rem; font-variant-numeric: tabular-nums; }

.result-actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.4rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .85rem 1.3rem; border-radius: var(--r);
  font-weight: 700; font-size: 1rem;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn--primary { background: var(--sello); color: var(--papel); flex: 1 1 16rem; }
.btn--primary:hover { background: color-mix(in srgb, var(--sello) 84%, #000); }
.btn--ghost { border: 1.5px solid var(--regla); }
.btn--ghost:hover { border-color: var(--sello); color: var(--sello); }
.btn[disabled] { opacity: .6; pointer-events: none; }
.result-hint { margin-top: .7rem; font-size: .87rem; color: var(--tinta-2); }

.privacy-badge {
  display: flex; align-items: center; gap: .5rem;
  margin-top: 1.4rem; padding-top: 1rem; border-top: 1px solid var(--regla);
  font-size: .85rem; color: var(--tinta-2);
}
.privacy-badge svg { flex: none; width: 15px; height: 15px; fill: none; stroke: var(--sello); stroke-width: 1.8; }

/* ---------- 6. Secciones ---------- */
.section { padding-block: clamp(2rem, 5.5vw, 3.25rem); }
.section > h2 { margin-bottom: 1.3rem; }

.steps { list-style: none; padding: 0; display: grid; gap: 1.4rem; counter-reset: paso; }
.step { border-top: 2px solid var(--tinta); padding-top: .9rem; }
.step-icon { display: block; width: 26px; height: 26px; color: var(--sello); margin-bottom: .6rem; }
.step-icon svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.step h3 { margin-bottom: .25rem; }
.step p { color: var(--tinta-2); font-size: .96rem; }

.cards { list-style: none; padding: 0; display: grid; gap: 1.1rem; }
.card { border-top: 1px solid var(--regla); padding-top: .8rem; }
.card h3 { margin-bottom: .2rem; }
.card p { color: var(--tinta-2); font-size: .95rem; }

.prose { max-width: 38rem; }
.prose h3 { font-size: 1.2rem; margin-top: 1.7rem; margin-bottom: .35rem; }
.prose p { margin-top: .8rem; color: var(--tinta-2); }
.prose strong { color: var(--tinta); font-weight: 700; }

.faq { display: grid; max-width: 42rem; border-top: 1px solid var(--regla); }
.faq details { border-bottom: 1px solid var(--regla); }
.faq summary { cursor: pointer; padding: .95rem 2rem .95rem 0; font-weight: 600; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: .2rem; top: .85rem; font-family: var(--mono); color: var(--sello); font-weight: 700; font-size: 1.1rem; }
.faq details[open] summary::after { content: "–"; }
.faq p { padding: 0 0 1rem; color: var(--tinta-2); }

.site-footer { border-top: 2px solid var(--tinta); padding-block: 1.8rem; margin-top: 1rem; }
.footer-inner { display: grid; gap: .5rem; }
.footer-brand { font-family: var(--display); font-weight: 700; }
.footer-links { display: flex; gap: 1.2rem; font-size: .92rem; }
.footer-links a { color: var(--tinta-2); text-decoration: underline; text-underline-offset: 3px; }
.footer-links a:hover { color: var(--sello); }
.footer-note { font-size: .82rem; color: var(--tinta-3); max-width: 34rem; }

/* ---------- 7. Huecos de anuncios (vacíos: el dueño pega AdSense) ---------- */
.ad-slot {
  position: relative;
  border: 1px dashed var(--regla);
  border-radius: var(--r);
  display: grid; place-items: center;
}
.ad-slot::before {
  content: attr(data-label);
  font-family: var(--mono); font-weight: 700;
  font-size: .66rem; letter-spacing: .2em; color: var(--tinta-3);
}
.ad-slot--leaderboard { min-height: 100px; margin-top: 1.2rem; }
.ad-slot--incontent { min-height: 250px; margin-block: .5rem; }
.ad-slot--dialog { min-height: 250px; width: 100%; margin-block: .9rem; }
.ad-slot--toast { min-height: 90px; width: 100%; border: 0; }
@media (min-width: 720px) { .ad-slot--leaderboard { min-height: 120px; } }

.ad-dialog {
  border: 1.5px solid var(--tinta); border-radius: var(--r);
  background: var(--ficha); color: var(--tinta);
  padding: 1.3rem; max-width: min(23rem, 92vw); width: 100%;
  box-shadow: 5px 5px 0 var(--regla);
}
.ad-dialog::backdrop { background: rgba(15,17,12,.5); }
.ad-dialog-close { position: absolute; top: .3rem; right: .7rem; font-size: 1.5rem; line-height: 1; color: var(--tinta-3); }
.ad-dialog-title { font-family: var(--display); font-weight: 700; font-size: 1.02rem; padding-right: 1.4rem; }
.ad-dialog .btn { width: 100%; }

.ad-toast {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 40;
  width: min(17rem, calc(100vw - 2rem));
  background: var(--ficha); border: 1.5px solid var(--tinta);
  border-radius: var(--r); padding: .85rem;
  box-shadow: 4px 4px 0 var(--regla);
  animation: slide .3s var(--ease);
}
.ad-toast-close { position: absolute; top: 0; right: .45rem; font-size: 1.3rem; line-height: 1.3; color: var(--tinta-3); }

/* ---------- 8. Responsive ---------- */
@media (min-width: 540px) {
  .header-note { display: block; }
  .chips { display: flex; flex-wrap: wrap; }
  .chip span { flex-direction: row; align-items: baseline; gap: .4rem; padding: .5rem .85rem; }
}
@media (min-width: 720px) {
  .row { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 1.6rem; }
  .cards { grid-template-columns: repeat(2, 1fr); gap: 1.2rem 2.2rem; }
  .result-meta { max-width: 26rem; }
  .btn--primary { flex: 0 0 auto; }
}
@media (min-width: 960px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- 9. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .result-card, .weekend-extra, .ad-toast { animation: none; }
}