:root {
  --bg:#fff; --soft:#f4f6f5; --ink:#12201c; --muted:#66736e; --line:#e3e8e6;
  --go:#1f6f5c; --go-deep:#175747; --tint:#e8f3ef; --stop:#b93a1e;
  --font:"Bricolage Grotesque", ui-rounded, "Segoe UI", system-ui, sans-serif;
}
* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font:400 17px/1.5 var(--font); min-height:100vh; display:flex; flex-direction:column; }
a { color:inherit; }
:focus-visible { outline:3px solid var(--go); outline-offset:3px; border-radius:4px; }
[hidden] { display:none !important; }

.top { border-bottom:1px solid var(--line); }
.top div, main, footer { width:100%; max-width:1120px; margin:0 auto; padding-left:20px; padding-right:20px; }
.top div { display:flex; align-items:center; height:60px; }
.brand { font-weight:800; font-size:22px; letter-spacing:-.03em; text-decoration:none; }
.brand span { color:var(--go); }
main { flex:1; padding-top:48px; padding-bottom:64px; }
footer { padding-top:20px; padding-bottom:28px; color:var(--muted); font-size:15px; border-top:1px solid var(--line); max-width:none; text-align:center; }

h1 { font-size:clamp(30px, 5vw, 44px); line-height:1.08; font-weight:800; letter-spacing:-.03em; margin:0 0 10px; text-wrap:balance; }
.what { margin:0; color:var(--muted); font-size:19px; }
.center { text-align:center; }

/* Portada */
.groups { display:grid; grid-template-columns:repeat(auto-fit, minmax(228px, 1fr)); gap:8px 20px; margin-top:36px; }
.group { margin:0 0 12px; padding-bottom:10px; border-bottom:1px solid var(--line); font-size:15px; font-weight:700; color:var(--muted); }
.groups > div { display:flex; flex-direction:column; gap:10px; margin-bottom:24px; }
.card { display:flex; align-items:flex-start; gap:14px; padding:16px; border:1px solid var(--line); border-radius:12px; text-decoration:none; transition:border-color .12s, background .12s; }
.card:hover { border-color:var(--go); background:var(--soft); }
.card svg { flex:none; width:32px; height:32px; margin-top:2px; color:var(--go); }
.card h3 { margin:0 0 2px; font-size:19px; font-weight:700; letter-spacing:-.015em; }
.card p { margin:0; color:var(--muted); font-size:15px; }

/* Pantalla de una herramienta */
.back { display:inline-block; margin-bottom:28px; color:var(--muted); font-size:15px; text-underline-offset:3px; }
.start { margin-top:36px; padding:56px 16px; border:2px dashed transparent; border-radius:16px; }
.tool.over .start { border-color:var(--go); background:var(--tint); }
.pick { display:inline-block; padding:18px 36px; border-radius:12px; background:var(--go); color:#fff; font-weight:700; font-size:21px; letter-spacing:-.01em; cursor:pointer; }
.pick:hover { background:var(--go-deep); }
.pick:focus-within { outline:3px solid var(--ink); outline-offset:3px; }
.pick input { position:absolute; opacity:0; width:1px; height:1px; }
.start p { margin:14px 0 0; color:var(--muted); font-size:15px; }

.work { display:grid; gap:24px; margin-top:32px; }
.stage { min-width:0; background:var(--soft); border-radius:14px; padding:18px; border:2px dashed transparent; }
.tool.over .stage { border-color:var(--go); }
.files { list-style:none; margin:0; padding:0; display:grid; grid-template-columns:repeat(auto-fill, minmax(136px, 1fr)); gap:12px; }
.files li, .more { background:#fff; border:1px solid var(--line); border-radius:10px; padding:10px; display:flex; flex-direction:column; align-items:center; min-width:0; }
.thumb { width:100%; aspect-ratio:1; display:grid; place-items:center; }
.thumb canvas, .thumb img { max-width:100%; max-height:100%; display:block; box-shadow:0 0 0 1px var(--line); }
.thumb.plain { color:var(--go); } .thumb.plain svg { width:56px; height:56px; }
.files .name { width:100%; margin-top:8px; font-size:14px; font-weight:500; text-align:center; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.files .size { font-size:13px; color:var(--muted); }
.files .row { display:flex; gap:2px; margin-top:4px; }
.files li button { width:32px; height:30px; border:0; border-radius:6px; background:none; color:var(--ink); font-size:15px; cursor:pointer; }
.files li button:hover:not(:disabled) { background:var(--soft); }
.files li button:disabled { opacity:.2; cursor:default; }
.more { justify-content:center; gap:4px; border-style:dashed; border-color:#b9c4c0; color:var(--go); font:700 15px var(--font); cursor:pointer; min-height:150px; }
.more:hover { background:var(--tint); }
.more b { font-size:30px; line-height:1; font-weight:400; }

.one { display:flex; align-items:center; gap:10px; font-size:15px; }
.one .name { font-weight:700; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.one .size { color:var(--muted); flex:none; }
.one button { margin-left:auto; flex:none; border:0; background:none; color:var(--go); font:700 15px var(--font); cursor:pointer; text-decoration:underline; text-underline-offset:3px; }
.hint { margin:14px 0 0; font-size:15px; color:var(--muted); }
.pages { display:grid; grid-template-columns:repeat(auto-fill, minmax(92px, 1fr)); gap:10px; margin-top:12px; }
.pages:empty { display:none; }
.pages button { display:flex; flex-direction:column; align-items:center; gap:2px; padding:6px 6px 4px; border:2px solid var(--line); border-radius:8px; background:#fff; color:var(--ink); font:500 13px var(--font); cursor:pointer; }
.pages button[aria-pressed="true"] { border-color:var(--go); background:var(--tint); font-weight:800; }
.pg { width:100%; aspect-ratio:1; display:grid; place-items:center; transition:transform .2s; }
.pg canvas { max-width:88%; max-height:88%; box-shadow:0 0 0 1px var(--line); }

/* Pantalla de carga */
.busy { margin-top:56px; }
.busy h2 { margin:0 0 20px; font-size:26px; font-weight:700; letter-spacing:-.02em; }
.bar { height:10px; max-width:420px; margin:0 auto; background:var(--line); border-radius:99px; overflow:hidden; }
.bar i { display:block; height:100%; width:0; background:var(--go); border-radius:99px; transition:width .2s; }
@keyframes slide { from { transform:translateX(-40%); } to { transform:translateX(190%); } }
.bar.wait i { width:40% !important; animation:slide 1.1s ease-in-out infinite alternate; }
.busy p { min-height:24px; margin:16px 0 0; color:var(--muted); font-size:15px; }

/* Pantalla de resultado */
.done { margin-top:40px; text-align:center; }
.done h2 { margin:0 0 20px; font-size:28px; font-weight:800; letter-spacing:-.02em; }
.result { display:inline-flex; align-items:center; gap:16px; max-width:100%; margin-bottom:22px; padding:14px 22px 14px 14px; background:var(--soft); border-radius:14px; text-align:left; }
.result .thumb { flex:none; width:84px; padding:6px; background:#fff; border-radius:6px; color:var(--go); }
.result .thumb svg { width:40px; height:40px; }
.result .name { margin:0; font-weight:700; overflow-wrap:anywhere; }
.result .size { color:var(--muted); font-size:15px; }
.saved { margin:0 0 20px; font-weight:700; color:var(--go); }
.done .pick { text-decoration:none; }
.auto { margin:12px 0 0; color:var(--muted); font-size:15px; }
.done h3 { margin:44px 0 12px; font-size:17px; font-weight:700; }
.next { display:flex; flex-wrap:wrap; justify-content:center; gap:8px; max-width:780px; margin:0 auto; }
.next button { display:inline-flex; align-items:center; gap:8px; padding:9px 15px 9px 10px; border:1px solid var(--line); border-radius:99px; background:#fff; color:var(--ink); font:500 15px var(--font); cursor:pointer; }
.next button:hover { border-color:var(--go); background:var(--soft); }
.next svg { width:22px; height:22px; color:var(--go); }
.again { display:flex; flex-wrap:wrap; justify-content:center; gap:8px 28px; margin-top:36px; }
.again button { border:0; background:none; color:var(--muted); font:500 15px var(--font); text-decoration:underline; text-underline-offset:3px; cursor:pointer; }

/* Páginas de texto (privacidad, términos) */
.doc { max-width:68ch; }
.doc h1 { margin-bottom:6px; }
.doc .date { margin:0 0 32px; color:var(--muted); font-size:15px; }
.doc h2 { margin:36px 0 8px; font-size:22px; font-weight:700; letter-spacing:-.015em; }
.doc p, .doc li { margin:0 0 12px; }
.doc ul { margin:0 0 12px; padding-left:22px; }
footer nav { display:flex; flex-wrap:wrap; justify-content:center; gap:6px 22px; margin-top:8px; }
footer a { text-underline-offset:3px; }

/* Publicidad: un único bloque discreto, debajo del contenido */
.ad { margin:56px auto 0; max-width:728px; text-align:center; }
.ad small { display:block; margin-bottom:6px; color:var(--muted); font-size:12px; }
.ad ins { display:block; min-height:100px; }

.side label { display:block; margin-bottom:16px; font-size:15px; font-weight:700; }
.side input, .side select { display:block; width:100%; margin-top:6px; padding:11px 12px; border:1.5px solid #b9c4c0; border-radius:8px; background:#fff; color:var(--ink); font:400 17px var(--font); }
.side input::placeholder { color:#8a9692; }
.go { width:100%; padding:16px; border:0; border-radius:12px; background:var(--go); color:#fff; font:700 19px var(--font); letter-spacing:-.01em; cursor:pointer; }
.go:hover:not(:disabled) { background:var(--go-deep); }
.go:disabled { background:var(--line); color:#8a9692; cursor:not-allowed; }
.msg { margin-top:12px; font-size:15px; font-weight:500; min-height:23px; color:var(--go); }
.msg.err { color:var(--stop); }
.msg.wait { color:var(--muted); }

@media (min-width:860px) {
  main { padding-top:64px; }
  .work { grid-template-columns:1fr 300px; align-items:start; }
  .side { position:sticky; top:24px; }
}
@media (prefers-reduced-motion:reduce) { .card, .pg, .bar i { transition:none; } .bar.wait i { animation:none; width:100% !important; opacity:.45; } }

/* Texto de ayuda bajo cada herramienta: discreto, para quien lo busque */
.about { margin:88px 0 0; padding-top:28px; border-top:1px solid var(--line); color:var(--muted); font-size:14px; line-height:1.5; }
.about h2 { margin:0 0 8px; font-size:15px; font-weight:700; color:var(--ink); letter-spacing:0; }
.about h2:not(:first-child) { margin-top:24px; }
.about p { margin:0 0 8px; max-width:80ch; }
.about ol { margin:0; padding:0; list-style:none; counter-reset:paso; display:grid; grid-template-columns:repeat(auto-fit, minmax(220px, 1fr)); gap:6px 28px; }
.about ol li { counter-increment:paso; margin:0; }
.about ol li::before { content:counter(paso) ". "; font-weight:700; color:var(--ink); }
.about details { border-bottom:1px solid var(--line); max-width:80ch; }
.about summary { padding:9px 0; cursor:pointer; color:var(--ink); font-weight:500; }
.about details p { margin:0 0 10px; }
.about .others { list-style:none; margin:0; padding:0; display:flex; flex-wrap:wrap; gap:4px 16px; }
.about .others li { margin:0; }
.about a { text-underline-offset:3px; }
.about .ad { margin:28px auto; }
.lost { text-align:center; padding:40px 0; }
.lost .pick { text-decoration:none; margin-top:24px; }

/* Cambio de idioma */
.langs { display:flex; align-items:center; gap:2px; margin-left:auto; font-size:14px; }
.langs a, .langs span { padding:6px 8px; border-radius:8px; color:var(--muted); text-decoration:none; }
.langs a:hover { color:var(--ink); background:var(--soft); }
.langs span { color:var(--ink); font-weight:700; }
span.pick { cursor:default; }

/* Enlace para saltar al contenido con el teclado */
.skip { position:absolute; left:-9999px; top:8px; z-index:10; padding:10px 16px; background:var(--ink); color:#fff; border-radius:8px; }
.skip:focus { left:8px; }
.done h2:focus { outline:none; }
.gone { margin:6px 0 0; color:var(--muted); font-size:14px; }

/* Página para arquitectos y enlaces de cabecera */
.nav { margin-left:auto; padding:8px 4px; color:var(--ink); font-size:15px; font-weight:500; text-decoration:none; }
.nav:hover { color:var(--go); }
.nav + .langs { margin-left:10px; }
.group.wide { margin-top:36px; }
.cards { display:grid; grid-template-columns:repeat(auto-fill, minmax(280px, 1fr)); gap:10px 20px; }
.more-link { padding:6px 2px; color:var(--go); font-size:15px; font-weight:700; text-underline-offset:3px; }

/* Chino: tipografía del sistema y sin apretar las letras */
html:lang(zh) { --font:"PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", system-ui, sans-serif; }
html:lang(zh) :is(h1, h2, h3, .brand, .pick, .go) { letter-spacing:0; }