:root{--blue:#0066cc;--blue-dark:#003c78;--blue-ink:#072c55;--blue-soft:#eaf4ff;--yellow:#ffcc00;--white:#fff;--ink:#12304d;--muted:#587087;--line:#dbe8f3;--surface:#f5faff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--surface);color:var(--ink);font:1rem/1.5 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{font:inherit}.site-header{background:var(--white);border-bottom:1px solid var(--line)}.header-inner,.hero-inner,.library,footer{width:min(1180px,calc(100% - 40px));margin-inline:auto}.header-inner{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:13px;color:var(--ink);text-decoration:none}.brand-mark{width:52px;height:52px;display:grid;place-items:center;border-radius:50%;background:var(--blue);border:4px solid var(--yellow);color:#fff;font-family:Georgia,serif;font-size:1.75rem;font-weight:800;box-shadow:0 0 0 2px var(--blue)}.brand strong,.brand small{display:block}.brand strong{font-size:1rem}.brand small{margin-top:3px;color:var(--muted);font-size:.78rem}.year-chip{padding:9px 14px;border-radius:999px;background:var(--blue-soft);color:var(--blue-dark);font-size:.82rem;font-weight:750}
.hero{position:relative;overflow:hidden;background:var(--blue);color:#fff}.hero:after{content:"";position:absolute;inset:auto 0 0;height:8px;background:var(--yellow)}.hero-inner{position:relative;z-index:2;min-height:410px;padding:70px 0 78px;display:grid;grid-template-columns:1.35fr .65fr;gap:60px;align-items:center}.eyebrow{display:flex;align-items:center;gap:9px;margin:0 0 18px;font-size:.82rem;font-weight:800;text-transform:uppercase;letter-spacing:.11em}.hero h1{margin:0;max-width:700px;font-size:clamp(3.25rem,8vw,6.6rem);line-height:.88;letter-spacing:-.065em}.hero h1 span{color:var(--yellow)}.hero-lead{max-width:640px;margin:24px 0;font-size:clamp(1.05rem,2vw,1.25rem);line-height:1.65;color:#e7f3ff}.hero-meta{display:flex;flex-wrap:wrap;gap:11px}.hero-meta span{padding:9px 12px;border:1px solid #ffffff4a;border-radius:10px;background:#ffffff14;font-size:.88rem}.hero-orbit{position:absolute;border-radius:50%;border:1px solid #ffffff24}.orbit-one{width:480px;height:480px;right:-90px;top:-250px}.orbit-two{width:660px;height:660px;right:-230px;bottom:-500px}.book-stack{position:relative;min-height:270px;perspective:900px}.book{position:absolute;right:6%;width:210px;height:270px;padding:28px;border-radius:10px 20px 20px 10px;box-shadow:-12px 18px 30px #00376e66;transform-origin:left center;font-weight:900;letter-spacing:.06em}.book:before{content:"";position:absolute;left:11px;top:0;bottom:0;width:3px;background:#ffffff50}.book-back{background:#fff;color:var(--blue);transform:rotate(-13deg) translate(-60px,3px)}.book-mid{background:var(--yellow);color:var(--blue-ink);transform:rotate(7deg) translate(25px,4px)}.book-front{display:flex;flex-direction:column;justify-content:flex-end;background:var(--blue-dark);color:#fff;transform:rotate(-2deg)}.book-front span{color:var(--yellow);font-size:1rem}.book-front strong{font-size:1.65rem}.book-front small{margin-top:8px;font-size:.8rem}
.availability-note{width:min(920px,calc(100% - 40px));margin:-27px auto 0;position:relative;z-index:3;display:flex;align-items:center;justify-content:center;gap:11px;padding:15px 20px;background:var(--yellow);color:var(--blue-ink);border:4px solid var(--surface);border-radius:16px;box-shadow:0 12px 28px #002b5517}.availability-note p{margin:0}.lock{width:18px;height:18px;display:grid;place-items:center;border:3px solid var(--blue-ink);border-radius:5px;font-size:0}
.library{padding:72px 0 84px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:40px;margin-bottom:28px}.section-kicker{margin:0 0 7px;color:var(--blue);font-size:.8rem;font-weight:850;letter-spacing:.12em;text-transform:uppercase}.section-heading h2{margin:0;font-size:clamp(2rem,4vw,3rem);letter-spacing:-.04em}.section-heading>p{max-width:440px;margin:0;color:var(--muted);line-height:1.6}.months-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.month-panel{border-radius:24px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 18px 55px #0f4b7912}.month-heading{min-height:112px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:25px 28px}.month-heading span{font-size:.72rem;font-weight:850;letter-spacing:.12em;text-transform:uppercase}.month-heading h3{margin:2px 0 0;font-size:2rem;letter-spacing:-.035em}.month-heading .calendar{font-size:2.5rem;letter-spacing:0;opacity:.78}.month-panel.blue .month-heading{background:var(--blue);color:#fff}.month-panel.yellow .month-heading{background:var(--yellow);color:var(--blue-ink)}.books-grid{padding:16px;display:grid;grid-template-columns:1fr 1fr;gap:12px}.resource-card{position:relative;min-height:220px;overflow:hidden;padding:18px;border:1px solid var(--line);border-radius:17px;background:#fbfdff}.resource-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.pdf-icon{display:inline-grid;place-items:center;width:45px;height:34px;border-radius:8px;background:var(--blue-soft);color:var(--blue);font-size:.72rem;font-weight:900}.status{padding:5px 8px;border-radius:999px;background:#eef2f6;color:#6b7e91;font-size:.66rem;font-weight:750}.status.ready{background:#e0f7ea;color:#12603b}.resource-card>p{margin:22px 0 4px;color:var(--muted);font-size:.76rem}.resource-card h4{margin:0;font-size:1.35rem;letter-spacing:-.025em}.resource-actions{display:flex;gap:7px;margin-top:21px}.resource-actions a,.resource-actions span{position:relative;z-index:2;flex:1;min-height:38px;display:inline-flex;justify-content:center;align-items:center;gap:6px;border-radius:9px;font-size:.75rem;font-weight:780;text-decoration:none}.resource-actions a:first-child{background:var(--blue);color:#fff}.resource-actions a:last-child{background:var(--yellow);color:var(--blue-ink)}.resource-actions a:hover,.resource-actions a:focus-visible{filter:brightness(.93);outline:3px solid #003c7840;outline-offset:2px}.resource-actions span{background:#e9eff5;color:#8090a0;cursor:not-allowed}.card-number{position:absolute;right:12px;bottom:-20px;color:#0066cc09;font-size:5.7rem;line-height:1;font-weight:950;pointer-events:none}
.help-strip{padding:25px max(20px,calc((100% - 1180px)/2));display:flex;align-items:center;justify-content:space-between;gap:32px;background:var(--blue-ink);color:#fff}.help-strip>div{display:flex;align-items:center;gap:13px}.shield{color:var(--yellow);font-size:1.4rem}.help-strip p{margin:0;color:#d9e9f7;line-height:1.5;font-size:.9rem}.help-strip strong,.help-strip span{display:block}.help-strip strong{color:#fff}footer{min-height:145px;padding:35px 0;display:flex;justify-content:space-between;align-items:center;gap:24px;color:var(--muted);font-size:.84rem}.footer-brand{display:flex;align-items:center;gap:12px}.brand-mark.small{width:40px;height:40px;border-width:3px;font-size:1.25rem}.footer-brand p{margin:0}.footer-brand strong,.footer-brand span{display:block}.footer-brand strong{color:var(--ink)}
@media(max-width:900px){.hero-inner{grid-template-columns:1fr;min-height:0;padding-bottom:64px}.book-stack{display:none}.months-grid{grid-template-columns:1fr}.section-heading{align-items:start;flex-direction:column;gap:14px}}
@media(max-width:620px){.header-inner,.hero-inner,.library,footer{width:min(100% - 28px,1180px)}.header-inner{min-height:72px}.year-chip{display:none}.brand-mark{width:44px;height:44px;font-size:1.4rem}.hero-inner{padding:54px 0 62px}.hero h1{font-size:clamp(3.1rem,18vw,4.7rem)}.availability-note{width:calc(100% - 28px);align-items:flex-start;justify-content:flex-start}.library{padding:56px 0 64px}.books-grid{grid-template-columns:1fr}.resource-card{min-height:205px}.help-strip,footer{align-items:flex-start;flex-direction:column}.help-strip{padding-block:28px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Visor PDF protegido */
.resource-actions button{position:relative;z-index:2;flex:1;min-height:38px;display:inline-flex;justify-content:center;align-items:center;gap:6px;border:0;border-radius:9px;background:var(--blue);color:#fff;font:780 .75rem/1 Inter,ui-sans-serif,system-ui,sans-serif;cursor:pointer}.resource-actions button:hover,.resource-actions button:focus-visible{filter:brightness(.93);outline:3px solid #003c7840;outline-offset:2px}.pdf-viewer{width:min(1100px,calc(100vw - 28px));max-width:none;height:min(900px,92vh);padding:18px;border:1px solid var(--line);border-radius:20px;background:#fff;color:var(--ink);box-shadow:0 30px 90px #001d3d55}.pdf-viewer[open]{display:grid;grid-template-rows:auto auto minmax(0,1fr);gap:14px}.pdf-viewer::backdrop{background:#001b35b8;backdrop-filter:blur(3px)}.pdf-viewer-header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.pdf-viewer-header h2{margin:0;color:var(--blue-ink);font-size:1.15rem}.pdf-viewer-header p{margin:5px 0 0;color:var(--muted);font-size:.84rem}.close-pdf{flex:0 0 auto;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--blue-ink);font-size:1.5rem;line-height:1;cursor:pointer}.pdf-viewer-toolbar{display:flex;gap:8px}.pdf-viewer-toolbar a{min-height:40px;display:inline-flex;align-items:center;padding:8px 12px;border-radius:9px;background:var(--blue-soft);color:var(--blue-dark);font-size:.82rem;font-weight:780;text-decoration:none}.pdf-viewer-frame{min-height:0;overflow:hidden;border:1px solid var(--line);border-radius:12px;background:#edf3f8}.pdf-viewer-frame iframe{display:block;width:100%;height:100%;min-height:420px;border:0;background:#fff}.pdf-viewer-frame p{display:none;margin:0;padding:14px;color:var(--muted);font-size:.82rem;text-align:center}
@media(max-width:620px){.pdf-viewer{width:calc(100vw - 16px);height:94vh;padding:12px;border-radius:14px}.pdf-viewer-header h2{font-size:1rem}.pdf-viewer-frame iframe{min-height:65vh}.pdf-viewer-frame p{display:block}}

/* Meses desplegables */
.months-grid{display:grid;grid-template-columns:1fr;gap:16px}.month-panel{margin:0}.month-heading{cursor:pointer;list-style:none}.month-heading::-webkit-details-marker{display:none}.month-heading::marker{display:none}.month-heading .month-title{display:block;margin-top:2px;font-size:2rem;line-height:1.1;letter-spacing:-.035em;text-transform:none}.month-count{margin-left:auto;padding:7px 11px;border:1px solid currentColor;border-radius:999px;opacity:.8}.month-chevron{font-size:1.8rem;line-height:1;transition:transform .2s ease}.month-panel[open] .month-chevron{transform:rotate(180deg)}.books-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:900px){.books-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.books-grid{grid-template-columns:1fr}.month-heading{min-height:94px;padding:20px}.month-heading .month-title{font-size:1.65rem}.month-count{display:none}}

/* Títulos reales y estado sin publicaciones */
.resource-card{min-height:255px}.resource-card .book-author{margin:6px 0 0;color:var(--muted);font-size:.83rem}.month-empty{min-height:230px;margin:16px;padding:40px;display:flex;align-items:center;justify-content:center;gap:20px;border:1px dashed #c8d8e6;border-radius:18px;background:#fbfdff;text-align:left}.month-empty-icon{flex:0 0 auto;width:62px;height:62px;display:grid;place-items:center;border-radius:50%;background:var(--yellow);color:var(--blue-ink);font-size:2rem}.month-empty h3{margin:0;color:var(--blue-ink);font-size:1.45rem;letter-spacing:-.02em}.month-empty p{margin:5px 0 2px;color:var(--ink);font-weight:700}.month-empty div>span{color:var(--muted);font-size:.88rem;line-height:1.5}
@media(max-width:620px){.resource-card{min-height:235px}.month-empty{min-height:220px;margin:12px;padding:28px 20px;align-items:center;flex-direction:column;text-align:center}}

/* Menú institucional */
.header-actions{display:flex;align-items:center;gap:10px}.site-menu{position:relative;z-index:30}.site-menu summary{min-height:42px;display:flex;align-items:center;gap:8px;padding:9px 13px;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--blue-ink);font-size:.82rem;font-weight:800;list-style:none;cursor:pointer}.site-menu summary::-webkit-details-marker{display:none}.site-menu summary::marker{display:none}.site-menu summary:hover,.site-menu summary:focus-visible{background:var(--blue-soft);outline:3px solid #0066cc45;outline-offset:2px}.site-menu nav{position:absolute;top:calc(100% + 12px);right:0;width:min(360px,calc(100vw - 28px));display:grid;gap:9px;padding:16px;border:1px solid var(--line);border-radius:17px;background:#fff;box-shadow:0 22px 60px #072c5530}.site-menu nav>strong{padding:3px 3px 8px;color:var(--blue-ink);font-size:.88rem}.site-menu nav a{min-height:65px;display:flex;align-items:center;gap:12px;padding:11px 12px;border:1px solid var(--line);border-radius:12px;background:#fbfdff;color:var(--blue-ink);font-size:.86rem;font-weight:750;text-decoration:none}.site-menu nav a:hover,.site-menu nav a:focus-visible{border-color:#0066cc66;background:var(--blue-soft);outline:none}.site-menu nav a>span:last-child{flex:1}.site-menu nav small{display:block;margin-top:2px;color:var(--muted);font-size:.72rem;font-weight:500}
@media(max-width:620px){.site-menu .menu-label{display:none}.site-menu summary{width:44px;padding:0;justify-content:center}}

/* Crédito del sitio */
.footer-meta{max-width:500px;text-align:right}.footer-meta p{margin:0}.footer-meta small{display:block;margin-top:5px;color:var(--muted);font-size:.72rem;line-height:1.45}
@media(max-width:620px){.footer-meta{text-align:left}}