:root{--ink:#0b2938;--muted:#42616c;--paper:#f8f8f3;--teal:#00767c;--orange:#f9660b;--line:#cddcde;--soft:#eaf2ef}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:104px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Segoe UI,Arial,sans-serif}a{color:#006c80;text-underline-offset:3px}a:hover{color:#a94003}img{max-width:100%;height:auto}button,input,summary{font:inherit}:focus-visible{outline:3px solid var(--orange);outline-offset:4px}[hidden]{display:none!important}.efb-skip{position:absolute;left:16px;top:-100px;z-index:1000;background:#fff;padding:14px}.efb-skip:focus{top:12px}.efb-wrap{max-width:1160px;margin:auto;padding:0 24px}.efb-crumbs{font-size:.85rem;margin-top:28px;display:flex;gap:10px;flex-wrap:wrap}.efb-hero{padding:36px 0 44px}.efb-hero-grid{display:grid;grid-template-columns:1.14fr 1fr;gap:44px;align-items:center}.efb-label{text-transform:uppercase;font-size:.74rem;letter-spacing:.11em;color:var(--teal);font-weight:750}.efb-hero h1{font-size:clamp(2.2rem,4.2vw,3.8rem);line-height:1.09;letter-spacing:-.035em;margin:16px 0 24px}.efb-lead{font-size:1.12rem;line-height:1.75;color:var(--muted)}.efb-meta{font-size:.82rem;color:var(--muted);border-top:1px solid var(--line);padding:15px 0;margin-top:24px}.efb-hero figure{margin:0}.efb-hero img{width:100%;border-radius:16px}.efb-hero figcaption{font-size:.78rem;line-height:1.6;margin-top:10px;color:var(--muted)}.efb-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.efb-button{display:inline-block;text-decoration:none;border:1px solid #5e8391;border-radius:8px;padding:12px 16px;font-weight:650;font-size:.9rem;background:#fff}.efb-button.primary{background:var(--orange);border-color:var(--orange);color:var(--ink)}.efb-routes{border-block:1px solid var(--line);padding:34px 0 38px;margin-bottom:46px}.efb-routes h2{margin-top:0;font-size:1.6rem}.efb-tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.efb-tile{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;text-decoration:none;gap:8px}.efb-tile strong{font-size:1.02rem}.efb-tile small{line-height:1.6;color:var(--muted)}.efb-tile:hover{border-color:var(--teal);background:var(--soft)}.efb-regions{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.efb-regions details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px}.efb-regions summary{font-weight:650;cursor:pointer}.efb-regions ul{padding-left:18px;line-height:1.9;margin-bottom:0}.efb-reading{display:grid;grid-template-columns: minmax(0,790px) 280px;gap:55px;align-items:start}.efb-toc{position:sticky;top:100px;max-height:calc(100vh - 125px);overflow:auto;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:.87rem;padding:18px;order:2}.efb-toc summary{font-weight:750;cursor:pointer;font-size:1rem}.efb-toc ol{padding-left:18px;margin-bottom:2px}.efb-toc li{padding:6px 0;line-height:1.5}.efb-toc a{text-decoration:none}.efb-body{min-width:0;font-size:1.06rem;line-height:1.85}.efb-body p{margin:0 0 1.25em}.efb-body h2{font-size:1.95rem;line-height:1.2;letter-spacing:-.025em;margin:2.5em 0 .9em}.efb-body h2:first-child{margin-top:0}.efb-body h3{font-size:1.36rem;line-height:1.35;margin:1.8em 0 .7em}.efb-body h4{font-size:1.08rem;margin:1.6em 0 .6em}.efb-body ul,.efb-body ol{padding-left:26px;margin-bottom:1.5em}.efb-body li{margin-bottom:.65em}.efb-body figure{margin:30px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}.efb-body figure img{display:block;width:100%;object-fit:contain}.efb-body figcaption{padding:15px 18px;font-size:.86rem;line-height:1.65;color:var(--muted)}.efb-credit{display:block;font-size:.75rem;margin-top:7px}.efb-table{overflow:auto;margin:24px 0 32px;border:1px solid var(--line);border-radius:9px;background:#fff}.efb-body table{border-collapse:collapse;width:100%;font-size:.91rem;line-height:1.6;min-width:500px}.efb-body caption{text-align:left;font-weight:700;padding:16px}.efb-body th{background:#e5f0ef;text-align:left;color:var(--ink)}.efb-body th,.efb-body td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}.efb-body tr:last-child td{border-bottom:0}.efb-body blockquote,.efb-body .callout,.efb-body .note{margin:26px 0;background:var(--soft);padding:22px 24px;border-left:3px solid var(--teal);border-radius:0 10px 10px 0}.efb-body .formula{overflow:auto;background:#fff;border:1px solid var(--line);padding:18px;margin:20px 0;border-radius:9px}.efb-body math{font-family:Cambria Math,STIX Two Math,serif;line-height:1.5}.efb-body math[display=block]{padding:14px 8px;overflow:auto;max-width:100%;font-size:1.13em}.efb-body .references,.efb-body #referencias{font-size:.94rem}.efb-body .references li{margin-bottom:1.1em;overflow-wrap:anywhere}.efb-continue{background:var(--soft);border-radius:14px;padding:26px;margin:45px 0}.efb-footer{margin-top:65px;border-top:1px solid var(--line);padding:32px 0;font-size:.89rem;line-height:1.8}.efb-footer nav{display:flex;flex-wrap:wrap;gap:18px}.efb-footer button{background:transparent;border:1px solid var(--line);padding:6px 12px;border-radius:6px}.efb-search{display:flex;gap:10px;margin:22px 0}.efb-search input{padding:12px;border:1px solid var(--line);border-radius:7px;width:min(500px,100%);background:#fff}.efb-search button{border:0;border-radius:7px;background:var(--orange);padding:10px 18px;font-weight:650}
@media(max-width:1000px){.efb-reading{grid-template-columns:minmax(0,1fr) 230px;gap:28px}.efb-tiles{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.efb-wrap{padding:0 20px}.efb-hero{padding:22px 0 32px}.efb-hero-grid{grid-template-columns:1fr;gap:24px}.efb-hero h1{font-size:2.5rem}.efb-hero figure{max-width:540px}.efb-routes{margin-bottom:26px;padding:26px 0}.efb-regions{grid-template-columns:1fr}.efb-reading{display:flex;flex-direction:column;gap:28px}.efb-toc{position:static;order:0;width:100%;max-height:none}.efb-body{order:1;font-size:1rem}.efb-body h2{font-size:1.65rem}.efb-body h3{font-size:1.24rem}.efb-tile{padding:14px}.efb-tile small{font-size:.79rem}.efb-hero figcaption{font-size:.73rem}.efb-table{margin-inline:0}.efb-crumbs{margin-top:20px}.efb-body figure{margin:24px 0}.efb-body th,.efb-body td{padding:10px 12px}.efb-body math[display=block]{font-size:1rem}.efb-search{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.efb-tile img{width:100%;aspect-ratio:16/9;object-fit:contain;background:#edf3ef;border-radius:7px;margin-bottom:8px}.efb-routes .efb-tile:has(img){padding:12px}.efb-routes .efb-tile:has(img) strong,.efb-routes .efb-tile:has(img) small{padding-inline:5px}
@media(max-width:760px){.efb-body{width:100%;max-width:100%;overflow-wrap:break-word}.efb-table,.efb-body .table-scroll{max-width:100%;min-width:0}.efb-body a{overflow-wrap:anywhere}}

/* Available biomechanics monographs */
.efb-family-intro{max-width:760px;color:var(--muted);line-height:1.7;margin:0 0 24px}
.efb-family-label{display:block;font-size:.67rem;font-weight:750;letter-spacing:.055em;text-transform:uppercase;color:var(--teal)}
.efb-routes .efb-tile:has(img) .efb-family-label{padding-inline:5px}
.efb-featured{padding:0 0 36px}
.efb-feature-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);align-items:center;gap:30px;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;text-decoration:none;color:var(--ink);padding:20px}
.efb-feature-card>img{display:block;width:100%;aspect-ratio:1200/760;object-fit:contain;background:#edf3ef;border-radius:10px}
.efb-feature-copy{padding:10px 14px 10px 0}
.efb-feature-copy h2{font-size:clamp(1.55rem,2.5vw,2.2rem);line-height:1.17;letter-spacing:-.025em;margin:12px 0 18px}
.efb-feature-copy p{color:var(--muted);font-size:1rem;line-height:1.75;margin:0 0 18px}
.efb-feature-link{font-size:.92rem;font-weight:750;color:var(--teal);display:inline-block;border-bottom:1px solid transparent;padding-bottom:3px}
.efb-feature-card:hover{color:var(--ink);border-color:var(--teal)}
.efb-feature-card:hover .efb-feature-link{border-color:var(--teal)}
@media(max-width:760px){.efb-featured{padding-bottom:24px}.efb-feature-card{grid-template-columns:1fr;padding:14px;gap:16px}.efb-feature-card>img{max-height:280px}.efb-feature-copy{padding:0 5px 8px}.efb-feature-copy h2{font-size:1.6rem}.efb-family-label{font-size:.68rem}}