/* Fast Turtle English — hoja de estilo única */

:root{
  --teal:#2fa89e;
  --teal-600:#248a82;
  --blue:#4a90c2;
  --ink:#0d1b21;
  --bg:#f6f8f8;
  --surface:#ffffff;
  --surface-2:#eef3f3;
  --text:#152229;
  --muted:#5d7078;
  --line:#dde5e6;
  --accent:#e8873a;
  --shadow:0 1px 2px rgba(13,27,33,.06), 0 8px 24px -12px rgba(13,27,33,.18);
  --radius:14px;
  --topbar-h:60px;
  --sidebar-w:290px;
  --maxw:820px;
}
:root[data-theme="dark"]{
  --bg:#0c1519;
  --surface:#122026;
  --surface-2:#182b32;
  --text:#e6eef0;
  --muted:#93a8b0;
  --line:#24393f;
  --teal:#43c2b6;
  --blue:#6aaede;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 30px -14px rgba(0,0,0,.7);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0c1519; --surface:#122026; --surface-2:#182b32; --text:#e6eef0;
    --muted:#93a8b0; --line:#24393f; --teal:#43c2b6; --blue:#6aaede;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 30px -14px rgba(0,0,0,.7);
  }
}

*{box-sizing:border-box}
/* display:grid/flex en .lightbox y .icon-btn pisaria el [hidden] del navegador */
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font:16px/1.6 "Inter","Segoe UI",system-ui,-apple-system,sans-serif;
  -webkit-font-smoothing:antialiased;
}
svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}

.skip{position:absolute;left:-999px;top:8px;z-index:99;background:var(--teal);color:#fff;padding:10px 16px;border-radius:8px}
.skip:focus{left:8px}

/* ---------- topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:40;height:var(--topbar-h);
  display:flex;align-items:center;gap:14px;padding:0 16px;
  background:color-mix(in srgb,var(--surface) 88%,transparent);
  backdrop-filter:saturate(1.4) blur(12px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:34px;height:34px;stroke:none}
.brand-text{display:flex;flex-direction:column;line-height:1}
.brand-text strong{font-size:15px;letter-spacing:-.2px}
.brand-text em{font-style:normal;font-size:11px;color:var(--muted);letter-spacing:.16em;text-transform:uppercase}

.icon-btn{
  display:grid;place-items:center;width:38px;height:38px;flex:none;
  background:transparent;border:1px solid transparent;border-radius:10px;cursor:pointer;
}
.icon-btn:hover{background:var(--surface-2)}
.icon-btn:focus-visible,a:focus-visible,input:focus-visible,button:focus-visible{outline:2px solid var(--teal);outline-offset:2px}
.nav-toggle{display:none}

.search{position:relative;flex:1;max-width:520px;margin-left:auto}
.search input{
  width:100%;height:40px;padding:0 42px;border-radius:11px;
  border:1px solid var(--line);background:var(--surface-2);color:var(--text);font-size:14.5px;
}
.search input::placeholder{color:var(--muted)}
.search-ico{position:absolute;left:12px;top:10px;color:var(--muted)}
.search kbd{
  position:absolute;right:10px;top:9px;font:600 11px/22px ui-monospace,monospace;
  min-width:22px;height:22px;text-align:center;color:var(--muted);
  background:var(--surface);border:1px solid var(--line);border-radius:6px
}
#themeBtn .ico-moon{display:none}
:root[data-theme="dark"] #themeBtn .ico-sun{display:none}
:root[data-theme="dark"] #themeBtn .ico-moon{display:block}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) #themeBtn .ico-sun{display:none}
  :root:not([data-theme="light"]) #themeBtn .ico-moon{display:block}
}

/* ---------- layout ---------- */
.shell{display:flex;align-items:flex-start}
.sidebar{
  position:sticky;top:var(--topbar-h);flex:none;width:var(--sidebar-w);
  height:calc(100vh - var(--topbar-h));overflow-y:auto;
  border-right:1px solid var(--line);background:var(--surface);
}
body.home .sidebar{display:none}
.sidebar-inner{padding:18px 12px 60px}
main{flex:1;min-width:0;padding:34px clamp(16px,4vw,48px) 90px}

/* ---------- nav tree ---------- */
.nav-book{margin-bottom:22px}
.nav-book>h3{
  margin:0 0 8px;padding:0 10px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)
}
.nav-sec{margin-bottom:6px}
.nav-sec>summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:8px;
  padding:8px 10px;border-radius:9px;font-weight:600;font-size:14px
}
.nav-sec>summary::-webkit-details-marker{display:none}
.nav-sec>summary:hover{background:var(--surface-2)}
.nav-sec>summary .chev{transition:transform .18s;color:var(--muted)}
.nav-sec[open]>summary .chev{transform:rotate(90deg)}
.nav-sec .count{margin-left:auto;font-size:11px;color:var(--muted);font-weight:500}
.nav-list{list-style:none;margin:2px 0 6px;padding:0 0 0 12px;border-left:1px solid var(--line)}
.nav-list a{
  display:flex;gap:8px;align-items:baseline;padding:6px 10px;border-radius:8px;
  font-size:13.5px;color:var(--muted);line-height:1.35
}
.nav-list a:hover{background:var(--surface-2);color:var(--text)}
.nav-list a.active{background:color-mix(in srgb,var(--teal) 14%,transparent);color:var(--text);font-weight:600}
.nav-list a .num{flex:none;font-variant-numeric:tabular-nums;font-size:11.5px;opacity:.7;min-width:16px}
.nav-list a.done .num::after{content:"✓";margin-left:2px;color:var(--teal)}

/* ---------- home ---------- */
.hero{
  max-width:1000px;margin:0 auto;padding:clamp(28px,6vw,72px) 0 20px;text-align:center;
}
.hero .eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;
  background:var(--surface);border:1px solid var(--line);font-size:12.5px;color:var(--muted)
}
.hero h1{
  margin:22px 0 14px;font-size:clamp(34px,6vw,58px);line-height:1.05;letter-spacing:-1.4px;font-weight:800
}
.hero h1 span{
  background:linear-gradient(100deg,var(--blue),var(--teal));
  -webkit-background-clip:text;background-clip:text;color:transparent
}
.hero p{max-width:56ch;margin:0 auto;color:var(--muted);font-size:clamp(16px,2vw,18.5px)}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:28px}
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:12px 22px;border-radius:11px;
  font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer
}
.btn-primary{background:linear-gradient(100deg,var(--blue),var(--teal));color:#fff}
.btn-primary:hover{filter:brightness(1.06)}
.btn-ghost{background:var(--surface);border-color:var(--line)}
.btn-ghost:hover{background:var(--surface-2)}

.stats{display:flex;gap:38px;justify-content:center;flex-wrap:wrap;margin:44px 0 10px}
.stats div{text-align:center}
.stats b{display:block;font-size:31.2px;letter-spacing:-.5px}
.stats span{font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}

.books{
  display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  max-width:1000px;margin:56px auto 0
}
.book-card{
  display:flex;gap:20px;padding:20px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .18s, box-shadow .18s
}
.book-card:hover{transform:translateY(-3px);box-shadow:0 16px 40px -20px rgba(13,27,33,.45)}
.book-card img{display:block;width:150px;height:auto;aspect-ratio:893/1263;flex:0 0 auto;align-self:flex-start;border-radius:9px;border:1px solid var(--line);background:#fff;object-fit:contain}
.book-card h2{margin:2px 0 8px;font-size:19px;letter-spacing:-.3px}
.book-card p{margin:0 0 14px;font-size:13.8px;color:var(--muted);line-height:1.5}
.chips{display:flex;gap:7px;flex-wrap:wrap}
.chip{
  font-size:11.5px;padding:4px 10px;border-radius:999px;
  background:var(--surface-2);color:var(--muted);border:1px solid var(--line)
}
.chip.on{background:color-mix(in srgb,var(--teal) 16%,transparent);color:var(--text);border-color:transparent}

/* ---------- planes ---------- */
.features{
  display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  max-width:1000px;margin:56px auto 0
}
.feature{padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.feature svg{color:var(--teal);margin-bottom:10px;width:22px;height:22px}
.feature h3{margin:0 0 6px;font-size:15px}
.feature p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.5}

.site-foot{
  max-width:1000px;margin:70px auto 0;padding-top:24px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted)
}

/* ---------- reader ---------- */
.crumbs{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--muted);margin-bottom:10px;flex-wrap:wrap}
.crumbs a:hover{color:var(--text)}
.crumbs svg{width:14px;height:14px;opacity:.55}

.doc{max-width:var(--maxw);margin:0 auto}
.doc-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:6px}
.doc h1{margin:0;font-size:clamp(25px,4vw,34px);line-height:1.2;letter-spacing:-.8px;flex:1}
.doc-meta{display:flex;align-items:center;gap:12px;margin:14px 0 30px;flex-wrap:wrap}
.badge{
  display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:5px 11px;border-radius:999px;
  background:var(--surface-2);border:1px solid var(--line);color:var(--muted)
}
.done-btn{
  display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;cursor:pointer;
  background:var(--surface);border:1px solid var(--line);font-size:13px
}
.done-btn:hover{background:var(--surface-2)}
.done-btn[aria-pressed="true"]{background:color-mix(in srgb,var(--teal) 16%,transparent);border-color:transparent;font-weight:600}
.done-btn svg{width:16px;height:16px;color:var(--teal)}

.section-progress{height:5px;border-radius:99px;background:var(--surface-2);overflow:hidden;margin:14px 0 4px}
.section-progress i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--teal))}

/* teoría: páginas escaneadas */
.pages{display:grid;gap:22px}
.page-fig{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.page-fig button{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in}
.page-fig img{display:block;width:100%;height:auto}
.page-fig figcaption{
  display:flex;justify-content:space-between;align-items:center;gap:10px;
  padding:9px 14px;font-size:12px;color:var(--muted);border-top:1px solid var(--line);background:var(--surface)
}

.notice{
  display:flex;gap:12px;padding:16px 18px;border-radius:var(--radius);
  background:color-mix(in srgb,var(--accent) 10%,var(--surface));
  border:1px solid color-mix(in srgb,var(--accent) 32%,transparent);font-size:14px;line-height:1.55
}
.notice svg{flex:none;color:var(--accent);margin-top:2px}

/* niveles */
.levels{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 26px}
.level-tab{
  padding:8px 15px;border-radius:10px;border:1px solid var(--line);background:var(--surface);
  cursor:pointer;font-size:13.5px;display:inline-flex;align-items:center;gap:8px
}
.level-tab:hover{background:var(--surface-2)}
.level-tab[aria-selected="true"]{
  background:linear-gradient(100deg,var(--blue),var(--teal));color:#fff;border-color:transparent;font-weight:600
}
.level-tab .stars{letter-spacing:1px;opacity:.85;font-size:11px}

.lvl-head{
  display:flex;align-items:center;gap:10px;margin:38px 0 16px;padding-top:10px;
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)
}
.lvl-head::after{content:"";flex:1;height:1px;background:var(--line)}

.block{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 22px;margin-bottom:16px;font-size:15px;line-height:1.75;overflow-wrap:break-word
}
.block strong{color:var(--text);font-weight:650}
.block :is(strong):first-child{display:inline-block;margin-bottom:4px}
.cards{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));margin-bottom:16px}
.cards .block{margin:0;font-size:14.5px}
.cards .block strong{
  display:block;margin:0 0 10px;padding-bottom:8px;border-bottom:1px solid var(--line);
  color:var(--teal);font-size:13.5px
}
mark{background:color-mix(in srgb,var(--accent) 40%,transparent);color:inherit;border-radius:3px;padding:0 2px}

/* índice de subtemas (Reading, Writing…) */
.tiles{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.tile{
  display:flex;align-items:center;gap:12px;padding:15px 17px;background:var(--surface);
  border:1px solid var(--line);border-radius:12px;transition:transform .15s,border-color .15s
}
.tile:hover{transform:translateY(-2px);border-color:var(--teal)}
.tile .n{
  flex:none;display:grid;place-items:center;width:30px;height:30px;border-radius:9px;
  background:var(--surface-2);font-size:12.5px;font-weight:700;color:var(--muted)
}
.tile span{font-size:14.5px;line-height:1.35}

/* prev / next */
.pager{display:grid;gap:12px;grid-template-columns:1fr 1fr;max-width:var(--maxw);margin:44px auto 0}
.pager a{
  padding:15px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface);
  display:flex;flex-direction:column;gap:3px;font-size:14.5px;transition:border-color .15s
}
.pager a:hover{border-color:var(--teal)}
.pager a small{font-size:11.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}
.pager a.next{text-align:right;grid-column:2}
.pager a.prev{grid-column:1}

/* búsqueda */
.results{max-width:var(--maxw);margin:0 auto}
.results h1{font-size:24px;margin:0 0 6px}
.results .hint{color:var(--muted);font-size:14px;margin:0 0 26px}
.result{
  display:block;padding:16px 18px;border:1px solid var(--line);border-radius:12px;
  background:var(--surface);margin-bottom:12px
}
.result:hover{border-color:var(--teal)}
.result .path{font-size:11.5px;color:var(--muted);letter-spacing:.05em;text-transform:uppercase}
.result h4{margin:5px 0 6px;font-size:16px}
.result p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.6}
.empty{text-align:center;color:var(--muted);padding:60px 0}

/* lightbox */
.lightbox{
  position:fixed;inset:0;z-index:80;background:rgba(6,14,17,.94);
  display:grid;place-items:center;padding:56px 16px
}
.lightbox img{max-width:100%;max-height:100%;object-fit:contain;background:#fff;border-radius:6px}
.lightbox .icon-btn{position:absolute;color:#fff;background:rgba(255,255,255,.1)}
.lightbox .icon-btn:hover{background:rgba(255,255,255,.22)}
.lb-close{top:14px;right:14px}
.lb-nav{top:50%;transform:translateY(-50%);width:46px;height:46px}
.lb-prev{left:14px}.lb-next{right:14px}
.lb-count{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);color:#cfe1e5;font-size:13px}

.scrim{position:fixed;inset:0;background:rgba(6,14,17,.5);z-index:35}

@media (max-width:900px){
  :root{--sidebar-w:280px}
  .nav-toggle{display:grid}
  body.home .nav-toggle{visibility:hidden}
  .brand-text{display:none}
  .sidebar{
    position:fixed;top:var(--topbar-h);left:0;z-index:36;
    transform:translateX(-100%);transition:transform .22s ease
  }
  body.nav-open .sidebar{transform:none}
  .search{margin-left:0}
  .search kbd{display:none}
  .book-card{flex-direction:column}
  .book-card img{width:140px}
  .pager{grid-template-columns:1fr}
  .pager a.next,.pager a.prev{grid-column:1}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}

@media print{
  .topbar,.sidebar,.pager,.scrim,.done-btn{display:none}
  main{padding:0}
  .block,.page-fig{break-inside:avoid;box-shadow:none}
}

/* rejilla de respuestas (libro A, desde el PDF de soluciones) */
.block .ans{
  display:grid;gap:5px 20px;margin-top:11px;
  grid-template-columns:repeat(auto-fill,minmax(150px,1fr))
}
.block .ans.long{grid-template-columns:1fr;gap:9px}
.block .ans span{font-variant-numeric:tabular-nums;line-height:1.5}
.block .ans.long span{padding-left:1.1em;text-indent:-1.1em}

/* ---------- teoría del libro A: la maqueta del cuaderno ----------
   En el PDF la rejilla es invisible y todo se apoya en una escala de grises:
   panel claro, cabecera en chip / banda / banda oscura, y filas destacadas. */
:root{
  --teo-panel:#f2f2f2;   /* fondo del panel      (0.95 del PDF) */
  --teo-band:#d9d9d9;    /* banda de cabecera    (0.85) */
  --teo-chip:#d4d4d4;    /* chip del titulo      (0.83) */
  --teo-dark:#a6a6a6;    /* cabecera oscura      (0.65) */
  --teo-row:#dedede;     /* fila destacada       (0.85) */
  --teo-g1:#8a8a8a;      /* gris de cuerpo normal */
  --teo-g2:#949494;      /* gris de los ejemplos  */
}
:root[data-theme="dark"]{
  --teo-panel:#17262c; --teo-band:#24383f; --teo-chip:#2b424a;
  --teo-dark:#3c5c66; --teo-row:#20333a; --teo-g1:#93a8b0; --teo-g2:#82969e;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --teo-panel:#17262c; --teo-band:#24383f; --teo-chip:#2b424a;
    --teo-dark:#3c5c66; --teo-row:#20333a; --teo-g1:#93a8b0; --teo-g2:#82969e;
  }
}

.doc.wide{max-width:1120px}
.panel{background:var(--teo-panel);border-radius:4px;overflow:hidden;padding-bottom:7px}
.panel h4{margin:0 0 4px;font-size:14.5px;font-weight:600;letter-spacing:-.1px}
.panel.cab-chip h4{text-align:center;padding:7px 0 5px}
.panel.cab-chip h4 span.t,.panel.cab-banda h4 span.t,.panel.cab-oscura h4 span.t{
  display:inline-block;padding:1px 9px;border-radius:3px;background:var(--teo-chip)
}
.panel.cab-banda h4{background:var(--teo-band);padding:5px 8px}
.panel.cab-banda h4 span.t{background:transparent;padding:0}
.panel.cab-oscura{padding-bottom:0}
.panel.cab-oscura h4{background:var(--teo-dark);color:#fff;text-align:center;padding:5px 8px}
.panel.cab-oscura h4 span.t{background:transparent;padding:0}

table.teo{width:100%;border-collapse:collapse;font-size:13.5px;line-height:1.5}
table.teo td{padding:3px 9px;border:0;background:transparent;vertical-align:top}
table.teo tr.medio td{background:var(--teo-row)}
.panel .g1{color:var(--teo-g1)}
.panel .g2{color:var(--teo-g2);font-size:.82em}
.block .g1,.block .g2{color:var(--muted)}
.block .g2{font-size:.85em}

.cards .panel table.teo{font-size:13px}
@media (max-width:620px){
  table.teo{font-size:12.5px}
  table.teo td{padding:3px 7px}
}

/* el matiz del título ("for he/she/it") va pequeño pero del mismo color */
.panel h4 .g1,.panel h4 .g2{color:inherit}
.panel h4 .g2{font-size:.72em;opacity:.82}

/* Teoría: texto real con la composición vectorial del cuaderno. */
.teoria-fragmento { margin: 24px 0; }
.teoria-herramientas { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:10px; font-size:13px; }
.teoria-scroll { overflow-x:auto; background:white; border-radius:8px; padding:12px; }
.teoria-vector { display:block; width:100%; height:auto; background:white; }
.teoria-fragmento.ampliado .teoria-vector { width:1106px; max-width:none; }
.teoria-accesible pre { white-space:pre-wrap; font-family:inherit; line-height:1.6; }
@media print { .teoria-herramientas, .teoria-accesible { display:none; } .teoria-scroll { padding:0; overflow:visible; } .teoria-fragmento.ampliado .teoria-vector { width:100%; } }

.teoria-vector svg { display:block; width:100%; height:auto; }
.teoria-estado { color:#404040; }
.teoria-vector svg { fill:#000; stroke:none; stroke-width:1; stroke-linecap:butt; stroke-linejoin:miter; color:#000; }

/* Logo de moi aussie en la portada. */
.hero-logo { display:block; width:min(460px,100%); height:auto; margin:0 auto 12px; }
:root[data-theme="dark"] .hero-logo { filter:brightness(0) invert(.9); }
@media (prefers-color-scheme:dark) { :root:not([data-theme="light"]) .hero-logo { filter:brightness(0) invert(.9); } }

/* Párrafos de las descripciones de los cuadernos. */
.book-card p { white-space:pre-line; }

/* Listas para facilitar la lectura de las descripciones. */
.book-benefits { margin:16px 0; padding-left:20px; color:var(--muted); font-size:14px; line-height:1.6; list-style:disc; }
.book-benefits li { padding-left:3px; margin:0 0 9px; }
.book-card .book-closing { margin-top:16px; font-weight:700; color:var(--text); }



/* Icono aportado: proporciones originales y contraste en ambos temas. */
img.brand-mark { display:block; object-fit:cover; flex:0 0 auto; }
:root[data-theme="dark"] img.brand-mark { filter:invert(1); }
@media (prefers-color-scheme:dark) { :root:not([data-theme="light"]) img.brand-mark { filter:invert(1); } }

/* Recorta el espacio transparente del logotipo en la composición. */
.hero-logo-frame{width:min(460px,100%);aspect-ratio:4;margin:0 auto 2px;overflow:hidden;}
.hero-logo-frame .hero-logo{width:100%;margin:0;transform:translateY(-17%);}

.book-card .book-intro{font-weight:600;color:color-mix(in srgb,var(--muted) 65%,var(--text));}

/* Botones de acceso de los libros: tamaño y contraste. */
.book-card .chip{display:inline-flex;align-items:center;justify-content:center;min-height:34px;padding:0 14px;font-size:13px;border-radius:999px;color:color-mix(in srgb,var(--muted) 65%,var(--text));border-color:color-mix(in srgb,var(--line) 75%,var(--muted));}

/* 32 px visibles y 44 px de superficie, con margen transparente. */
.book-card .chip{min-height:44px;padding:6px 0;border:0;background:transparent;}
.book-card .chip-face{display:inline-flex;align-items:center;justify-content:center;min-height:32px;padding:0 14px;border:1px solid color-mix(in srgb,var(--line) 75%,var(--muted));border-radius:999px;background:var(--surface-2);}
.book-card .chip.on .chip-face{background:color-mix(in srgb,var(--teal) 16%,transparent);}

.book-cover-link{display:block;flex:0 0 auto;align-self:flex-start;}

/* Accesos centrados en todo el ancho de cada libro. */
.book-card{display:grid;grid-template-columns:150px minmax(0,1fr);gap:16px 20px;}
.book-card .book-actions{grid-column:1 / -1;justify-content:center;gap:4px 7px;}
.book-card button.chip{font-family:inherit;cursor:not-allowed;}
.book-card .chip:disabled .chip-face{opacity:.5;}


.book-card .book-actions .chip-face{padding-inline:10px;}





/* Distribución adaptable: una, dos o tres tarjetas sin comprimir el texto. */
.books{max-width:1600px;grid-template-columns:minmax(0,1fr);align-items:stretch;gap:22px;}
.book-card{container-type:inline-size;min-width:0;width:100%;grid-template-columns:minmax(0,1fr);grid-template-rows:1fr auto;gap:16px;}
.book-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:20px;min-width:0;}
.book-info{display:flex;flex-direction:column;min-width:0;}
.book-card img{width:150px;max-width:100%;height:auto;}
.book-card .book-description{flex:1;}
.book-card .book-actions{grid-column:1;min-height:92px;align-content:end;align-self:end;}
@container(min-width:440px){.book-layout{grid-template-columns:150px minmax(0,1fr);}}
@media(min-width:768px){
 .books{grid-template-columns:repeat(2,minmax(0,1fr));}
 .books>.book-card:last-child:nth-child(odd){grid-column:1 / -1;width:calc((100% - 22px)/2);justify-self:center;}
 .book-card h2{min-height:46px;}
 .book-card .book-intro{min-height:42px;}
}
@media(min-width:1200px){
 .books{grid-template-columns:repeat(3,minmax(0,1fr));}
 .books>.book-card:last-child:nth-child(odd){grid-column:auto;width:100%;}
}
@media(max-width:767px){.book-card .book-actions{min-height:44px;}}

/* Escritorio: espacio suficiente para los cinco accesos en una sola línea. */
@media(min-width:1200px){
 .books{max-width:none;gap:18px;}
 .book-card{padding:16px;}
 .book-card .book-actions{flex-wrap:nowrap;gap:3px;min-height:44px;}
 .book-card .book-actions .chip-face{padding-inline:7px;}
 .book-card .book-actions .chip{font-size:12px;white-space:nowrap;}
}
@media(min-width:1200px){
 body.home main{padding-inline:24px;}
 .books{gap:12px;}
 .book-card{padding:12px;}
 .book-card .book-actions .chip-face{padding-inline:5px;}
}

/* Portadas protagonistas y accesos que aprovechan el ancho disponible. */
@media(min-width:1200px){
 .book-layout{grid-template-columns:150px minmax(0,1fr);gap:16px;}
 .book-card .book-actions{justify-content:space-between;gap:2px;}
 .book-card h2{min-height:0;}
 .book-card .book-intro{min-height:0;}
 .book-card .book-actions:has(> :only-child){justify-content:center;}
}

/* Portadas más grandes, alineadas con la altura del texto y el eslogan. */
@media(min-width:1200px){
 .book-layout{grid-template-columns:minmax(170px,42%) minmax(0,1fr);gap:12px;align-items:stretch;}
 .book-cover-link{align-self:stretch;display:flex;align-items:flex-start;}
 .book-card img{width:100%;max-width:none;}
 .book-card h2{margin-top:0;margin-bottom:6px;}
 .book-card .book-intro{margin-bottom:8px;line-height:1.35;}
 .book-card .book-closing{margin-top:8px;margin-bottom:0;}
}

/* Eslogan de tamaño uniforme, en todo el ancho de la tarjeta. */
.book-card{grid-template-rows:1fr auto auto;}
.book-card .book-closing{grid-column:1 / -1;white-space:nowrap;text-align:center;font-size:13px;line-height:1.5;margin:0;}
@media(max-width:359px){.book-card .book-closing{font-size:11.5px;}}

/* Eslogan en su posición original, siempre en una línea. */
.book-card{grid-template-rows:1fr auto;}
.book-card .book-closing{grid-column:auto;text-align:left;font-size:10px;white-space:nowrap;margin:8px 0 0;}
.book-card .book-closing{font-size:13px;}
@media(min-width:1200px){.book-card .book-closing{font-size:clamp(9.4px,.78vw,13px);}}

/* La descripción se centra en el espacio entre el subtítulo y el eslogan. */
.book-card .book-description{flex:0 1 auto;margin-block:auto;padding-block:12px;}
.book-card .book-intro{margin-bottom:0;}
.book-card .book-closing{margin-top:0;}