/* Exercise Library — fast static UI */
:root{
  --bg:#0d1117; --bg2:#161b22; --card:#161b22; --card2:#1c232c;
  --line:#262d36; --txt:#e6edf3; --mut:#8b949e; --acc:#ff5722; --acc2:#ff8a65;
  --good:#3fb950; --radius:14px; --shadow:0 8px 24px rgba(0,0,0,.35);
}
:root[data-theme=light]{
  --bg:#f5f6f8; --bg2:#fff; --card:#fff; --card2:#f0f2f5;
  --line:#e3e6ea; --txt:#1b2330; --mut:#5b6675; --acc:#e2511a; --acc2:#ff7043;
  --shadow:0 6px 20px rgba(20,30,50,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--txt);
  font:15px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--acc2);text-decoration:none}
img{display:block}

/* ---- header ---- */
header{
  position:sticky;top:0;z-index:50;background:rgba(13,17,23,.82);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
:root[data-theme=light] header{background:rgba(255,255,255,.85)}
/* auto-hide header on scroll (all screens): visible only at the very top */
header{transition:transform .28s ease}
header.hide{transform:translateY(-100%)}
.bar{max-width:1240px;margin:0 auto;padding:12px 18px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;white-space:nowrap;color:var(--txt)}
.logo .mark{flex:none;border-radius:8px}
.logo .brand{display:flex;flex-direction:column;line-height:1}
.logo .brand b{font-weight:800;font-size:16px;letter-spacing:1.5px}
.logo .brand i{font-style:normal;font-weight:600;font-size:10.5px;letter-spacing:3.2px;color:var(--mut)}
.search{flex:1;min-width:200px;position:relative}
.search input{
  width:100%;padding:11px 14px 11px 40px;border-radius:11px;border:1px solid var(--line);
  background:var(--card2);color:var(--txt);font-size:15px;outline:none;transition:border .15s;
}
.search input:focus{border-color:var(--acc)}
.search svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);opacity:.5}
.icon-btn{
  width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line);
  background:var(--card2);color:var(--txt);border-radius:11px;cursor:pointer;font-size:17px;
}
.icon-btn:hover{border-color:var(--acc)}

/* ---- filters ---- */
.filters{max-width:1240px;margin:0 auto;padding:6px 18px 0;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.fgroup{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.flabel{font-size:11px;text-transform:uppercase;letter-spacing:.7px;color:var(--mut);margin-right:2px}
.chip{
  padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--card2);
  color:var(--mut);font-size:13px;cursor:pointer;white-space:nowrap;transition:.13s;text-transform:capitalize;
}
.chip:hover{color:var(--txt);border-color:var(--acc2)}
.chip.on{background:var(--acc);border-color:var(--acc);color:#fff;font-weight:600}
select.chip{appearance:none;padding-right:26px;background-image:linear-gradient(45deg,transparent 50%,var(--mut) 50%),linear-gradient(135deg,var(--mut) 50%,transparent 50%);background-position:calc(100% - 14px) 52%,calc(100% - 9px) 52%;background-size:5px 5px,5px 5px;background-repeat:no-repeat}

/* ---- meta row ---- */
.meta{max-width:1240px;margin:0 auto;padding:14px 18px 4px;display:flex;justify-content:space-between;align-items:center;color:var(--mut);font-size:13px}
.clear{cursor:pointer;color:var(--acc2)}
.clear:hover{text-decoration:underline}

/* ---- grid ---- */
main{max-width:1240px;margin:0 auto;padding:8px 18px 60px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:16px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  cursor:pointer;transition:transform .14s,border-color .14s,box-shadow .14s;display:flex;flex-direction:column;
  color:inherit;text-decoration:none;
}
.card:hover{transform:translateY(-3px);border-color:var(--acc);box-shadow:var(--shadow)}
.thumb{aspect-ratio:1/1;width:100%;background:var(--card2);object-fit:cover}
.card .body{padding:10px 12px 12px;display:flex;flex-direction:column;gap:7px;flex:1}
.card h3{margin:0;font-size:14px;line-height:1.3;text-transform:capitalize}
.tags{display:flex;gap:5px;flex-wrap:wrap;margin-top:auto}
.tag{font-size:10.5px;padding:3px 7px;border-radius:6px;background:var(--card2);color:var(--mut);text-transform:capitalize;border:1px solid var(--line)}
.tag.t{color:var(--acc2);border-color:rgba(255,138,101,.35)}
.empty{text-align:center;padding:70px 20px;color:var(--mut)}
#sentinel{height:1px}

/* ---- modal ---- */
.modal{
  position:fixed;inset:0;z-index:100;display:none;align-items:flex-start;justify-content:center;
  background:rgba(0,0,0,.6);backdrop-filter:blur(3px);overflow-y:auto;padding:24px 14px;
}
.modal.open{display:flex}
.sheet{
  background:var(--bg2);border:1px solid var(--line);border-radius:18px;max-width:760px;width:100%;
  box-shadow:var(--shadow);overflow:hidden;animation:pop .18s ease;
}
@keyframes pop{from{transform:translateY(14px) scale(.98);opacity:0}to{transform:none;opacity:1}}
.sheet .top{display:grid;grid-template-columns:260px 1fr;gap:0}
@media(max-width:620px){.sheet .top{grid-template-columns:1fr}}
.sheet .gif{width:100%;aspect-ratio:1/1;object-fit:cover;background:var(--card2)}
.sheet .head{padding:20px 22px;position:relative}
.sheet h2{margin:0 36px 12px 0;font-size:21px;text-transform:capitalize;line-height:1.25}
.close{position:absolute;top:14px;right:14px;width:34px;height:34px;border:none;border-radius:9px;background:var(--card2);color:var(--txt);font-size:20px;cursor:pointer}
.close:hover{background:var(--acc);color:#fff}
.kv{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:6px}
.kv span{font-size:12px;padding:5px 10px;border-radius:8px;background:var(--card2);border:1px solid var(--line);text-transform:capitalize}
.kv b{color:var(--acc2);font-weight:600;text-transform:none;margin-right:4px}
.sec{padding:0 22px 22px}
.langs{display:flex;gap:6px;margin:6px 0 14px}
.langs button{padding:6px 12px;border-radius:9px;border:1px solid var(--line);background:var(--card2);color:var(--mut);cursor:pointer;font-size:13px;font-weight:600}
.langs button.on{background:var(--acc);border-color:var(--acc);color:#fff}
.steps{margin:0;padding:0;list-style:none;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:10px 0 10px 40px;border-bottom:1px solid var(--line)}
.steps li:last-child{border-bottom:none}
.steps li::before{content:counter(s);position:absolute;left:0;top:9px;width:26px;height:26px;border-radius:50%;background:var(--acc);color:#fff;font-size:13px;font-weight:700;display:grid;place-items:center}
.muscles{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.muscles span{font-size:12px;padding:4px 9px;border-radius:7px;background:var(--card2);border:1px solid var(--line);text-transform:capitalize}
.shead{font-size:12px;text-transform:uppercase;letter-spacing:.8px;color:var(--mut);margin:16px 0 7px}

footer{border-top:1px solid var(--line);color:var(--mut);font-size:13px}
footer .bar{justify-content:space-between}
.ig{display:inline-flex;align-items:center;gap:6px;color:var(--mut);font-weight:600}
.ig:hover{color:var(--acc2)}
.ig svg{flex:none}
.skel{animation:sk 1.2s infinite ease-in-out}
@keyframes sk{0%,100%{opacity:.4}50%{opacity:.8}}

/* ---- static article (SEO) pages ---- */
.backlink{margin-left:auto;color:var(--mut);font-size:14px;font-weight:600}
.backlink:hover{color:var(--acc2)}
main.article{max-width:880px;margin:0 auto;padding:18px 18px 60px}
.crumbs{color:var(--mut);font-size:13px;margin:6px 0 16px;text-transform:capitalize}
.crumbs a{color:var(--acc2)}
main.article article{display:grid;grid-template-columns:360px 1fr;gap:26px;align-items:start}
@media(max-width:680px){main.article article{grid-template-columns:1fr}}
main.article .hero{width:100%;height:auto;aspect-ratio:1/1;object-fit:cover;border-radius:var(--radius);border:1px solid var(--line);background:var(--card2)}
main.article h1{margin:0 0 14px;font-size:27px;line-height:1.2;text-transform:capitalize}
main.article h2{font-size:20px;margin:30px 0 10px}
main.article section{margin-top:8px}
main.article details{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0;background:var(--card)}
main.article summary{cursor:pointer;font-weight:600}
main.article details p{color:var(--mut);margin:10px 0 2px}
.cta{margin-top:34px}
.cta a{display:inline-block;background:var(--acc);color:#fff;padding:12px 22px;border-radius:11px;font-weight:700}
.cta a:hover{background:var(--acc2)}