:root{
  --bg:#F2F5F8; --surface:#FFFFFF; --fg:#0D1218; --muted:#55616E; --line:#D5DCE4;
  --accent:#1F5FD6; --accent-fg:#FFFFFF; --ice:#7FB0FF; --ink:#0D1218; --ink-2:#16202B; --on-ink:#F2F5F8; --on-ink-muted:#B7C3CF;
  --display:"Big Shoulders Display","Arial Narrow",Impact,sans-serif;
  --body:"Public Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0A0E13; --surface:#141B23; --fg:#EEF2F6; --muted:#9AA7B4; --line:#25303B; --accent:#7FB0FF; --accent-fg:#0A0E13; --ink:#0F1620; --ink-2:#18232F; color-scheme:dark}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--body);font-size:16px;line-height:1.6}
img{max-width:100%}
a{color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-fg);padding:10px 14px;z-index:20}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1160px;margin-inline:auto;padding-inline:16px}
.narrow{max-width:760px}
h1,h2,h3{font-family:var(--display);text-transform:uppercase;line-height:.98;margin:0;text-wrap:balance}
h2{font-size:clamp(32px,6vw,48px);font-weight:800}
h3{font-size:26px;font-weight:800}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:var(--muted);margin-bottom:8px}
.eyebrow.ice{color:var(--ice)}
.sub{color:var(--muted);max-width:60ch;margin:12px 0 24px}

/* header / footer */
.sitebar{background:var(--ink);color:var(--on-ink);position:sticky;top:env(safe-area-inset-top,0px);z-index:10}
.topin{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 20px;padding-block:10px}
.logo{font-family:var(--display);font-weight:900;font-size:26px;text-transform:uppercase;text-decoration:none;letter-spacing:.01em}
.sitebar nav{display:flex;flex-wrap:wrap;gap:4px 18px}
.sitebar nav a{text-decoration:none;font-weight:600;font-size:15px;padding:6px 0;color:var(--on-ink-muted);border-bottom:2px solid transparent}
.sitebar nav a:hover,.sitebar nav a[aria-current]{color:var(--on-ink);border-color:var(--ice)}
footer{margin-top:72px;background:var(--ink);color:var(--on-ink-muted);padding-block:32px 44px;font-size:13px}
footer p{margin:0 0 8px;max-width:74ch}
footer .brand{font-family:var(--display);font-size:30px;text-transform:uppercase;color:var(--on-ink);margin-bottom:10px}
.flinks{display:flex;flex-wrap:wrap;gap:6px 18px}
.flinks a,.socials a{font-weight:700;color:var(--on-ink)}
.socials{display:flex;flex-wrap:wrap;gap:8px 20px;margin-bottom:12px}

/* hero */
.hero{background:linear-gradient(115deg,transparent 0 58%,rgba(127,176,255,.10) 58% 72%,transparent 72%),linear-gradient(65deg,transparent 0 70%,rgba(127,176,255,.07) 70% 86%,transparent 86%),var(--ink);
  color:var(--on-ink);clip-path:polygon(0 0,100% 0,100% 92%,50% 100%,0 92%);padding-block:44px 88px}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:32px;align-items:center}
.hero-h{font-size:clamp(54px,11vw,118px);font-weight:900;margin-top:12px}
.hero-h span{color:var(--ice)}
.lede{font-size:18px;max-width:46ch;margin:18px 0 26px;color:var(--on-ink-muted)}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;padding:15px 26px;font-weight:700;text-decoration:none;border:0;background:var(--ice);color:#0A0E13;clip-path:polygon(12px 0,100% 0,calc(100% - 12px) 100%,0 100%)}
.btn.alt{background:transparent;color:var(--on-ink);clip-path:none;border:2px solid var(--ice);padding:13px 24px}
.btn.dark{background:var(--ink);color:var(--on-ink)}
.portrait{justify-self:center;width:100%;max-width:380px}
.frame{aspect-ratio:4/5;clip-path:polygon(18% 0,82% 0,100% 18%,100% 70%,50% 100%,0 70%,0 18%);background:linear-gradient(160deg,#243445,#0F1620);display:grid;place-items:center;position:relative}
.frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.frame svg{width:62%;height:auto}
.trust{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:-34px;position:relative}
.trust div{background:var(--surface);border:1px solid var(--line);padding:14px 16px;min-width:0}
.trust b{font-family:var(--display);font-size:34px;line-height:1;display:block}
.trust span{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.disc{margin:20px 0 0;padding:11px 14px;border-left:4px solid var(--accent);background:var(--surface);font-size:14px;color:var(--muted)}
.disc strong{color:var(--fg)}

/* sections */
.block{padding-block:52px 0}
.block.tight{padding-block:36px 0}
.block h2 a{text-decoration:none}
.more-row{margin:18px 0 0}
.textlink{font-weight:700;color:var(--accent)}
.cats{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}
.cat-tile{background:var(--ink);color:var(--on-ink);padding:18px 12px;display:flex;flex-direction:column;gap:10px;text-decoration:none;position:relative;overflow:hidden;min-width:0}
.cat-tile::after{content:"";position:absolute;right:-24px;bottom:-24px;width:70px;height:70px;background:rgba(127,176,255,.14);transform:rotate(45deg)}
.cat-tile .ci{width:34px;height:34px;fill:none;stroke:var(--ice);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.cat-tile b{font-family:var(--display);font-size:24px;text-transform:uppercase;line-height:1}
.cat-tile span{font-size:12px;color:var(--on-ink-muted)}
.cat-tile:hover{background:var(--ink-2)}
@media (max-width:900px){.cats{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:520px){.cats{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* page header + crumbs */
.phead{background:var(--ink);color:var(--on-ink);padding-block:32px 36px}
.phead h1{font-size:clamp(38px,7vw,68px);font-weight:900}
.phead .lead{max-width:62ch;margin:14px 0 0;color:var(--on-ink-muted);font-size:17px}
.phead .meta{margin:12px 0 0;color:var(--on-ink-muted);font-size:14px}
.crumbs{font-size:13px;color:var(--on-ink-muted);margin-bottom:12px}
.crumbs a{color:var(--ice)}

/* product cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:16px}
.grid.first{margin-top:24px}
.card{background:var(--surface);border:1px solid var(--line);display:flex;flex-direction:column;min-width:0;transition:transform .15s ease,box-shadow .15s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(13,18,24,.16)}
.media{position:relative;aspect-ratio:1/1;background:linear-gradient(160deg,#243445,#0F1620);display:grid;place-items:center;overflow:hidden}
.media .ico{width:30%;height:auto;fill:none;stroke:var(--ice);stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}
.media img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:#fff;padding:10px}
.badge{position:absolute;z-index:2;top:10px;left:10px;font-size:11px;letter-spacing:.1em;text-transform:uppercase;font-weight:800;padding:5px 9px;background:var(--ice);color:#0A0E13}
.tier{position:absolute;z-index:2;top:10px;right:10px;font-size:11px;letter-spacing:.1em;text-transform:uppercase;font-weight:700;padding:4px 8px;background:rgba(13,18,24,.78);color:#fff}
.body{padding:14px;display:flex;flex-direction:column;gap:6px;flex:1}
.kicker{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700}
.card p{margin:0;font-size:14px;color:var(--muted);flex:1;line-height:1.5}
.buy{margin-top:10px;display:block;text-align:center;padding:12px;font-weight:700;text-decoration:none;background:var(--accent);color:var(--accent-fg)}
.buy:hover{filter:brightness(1.1)}
@media (max-width:480px){.grid{grid-template-columns:minmax(0,1fr)}}
.tipbox{margin-top:36px;padding:22px;background:var(--surface);border:1px solid var(--line)}
.tipbox ul{margin:12px 0 0;padding-left:20px;max-width:70ch}
.tipbox li{margin-bottom:8px}

/* guides */
.gwrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.gcard{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--accent);padding:18px;text-decoration:none;min-width:0}
.gcard p{margin:0;color:var(--muted);font-size:15px;flex:1}
.gcard .more{font-weight:700;color:var(--accent)}
.gcard:hover{box-shadow:0 10px 26px rgba(13,18,24,.14)}
.prose{font-size:17px;line-height:1.7}
.prose h2{font-size:34px;margin:36px 0 10px}
.prose p,.prose ul,.prose ol{margin:0 0 16px}
.prose li{margin-bottom:6px}
.prose a{color:var(--accent);font-weight:600}
.prose table{border-collapse:collapse;width:100%;margin:0 0 18px;font-size:15px;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.prose th{background:var(--surface)}
.gear,.more{margin-top:44px}
.gear h2,.more h2{margin-bottom:16px}
.gear .grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
.fine{margin:36px 0 0;font-size:13px;color:var(--muted)}
.cta2{margin:28px 0}

/* offers, brands, faq */
.offers{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));border:1px solid var(--line);background:var(--surface)}
.offer{padding:22px;border-right:1px solid var(--line);min-width:0}
.offer:last-child{border-right:0}
.offer h3{margin:12px 0 8px}
.offer p{margin:0;color:var(--muted);font-size:15px}
.tag{display:inline-block;font-size:11px;letter-spacing:.12em;text-transform:uppercase;font-weight:700;padding:4px 8px;border:1px solid var(--accent);color:var(--accent)}
@media (max-width:700px){.offer{border-right:0;border-bottom:1px solid var(--line)}.offer:last-child{border-bottom:0}}
.collab{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.collab div{border-top:3px solid var(--accent);padding-top:12px;min-width:0}
.collab h3{font-size:24px;margin-bottom:4px}
.collab p{margin:0;color:var(--muted);font-size:15px}
.prosep{max-width:64ch;margin:12px 0}
details{background:var(--surface);border:1px solid var(--line);padding:14px 16px;margin-top:10px}
summary{cursor:pointer;font-weight:700}
details p{margin:10px 0 0;color:var(--muted);max-width:70ch}

@media (max-width:760px){
  .hero .wrap{grid-template-columns:minmax(0,1fr)}
  .portrait{max-width:230px;justify-self:start;order:-1}
  .hero{padding-block:30px 76px}
}
@media (prefers-reduced-motion:reduce){.card{transition:none}html{scroll-behavior:auto}}

/* ---- additions: guide cards, exercises, tools, search, toc ---- */
.sitebar nav a{white-space:nowrap}
.gcard .gt{display:flex;align-items:center;gap:10px;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700}
.gcard .gi{width:34px;height:34px;padding:7px;background:var(--ink);fill:none;stroke:var(--ice);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto}
.gwrap.big{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.chiprow{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.chiprow a{padding:8px 14px;border:1px solid var(--line);background:var(--surface);font-weight:600;font-size:14px;text-decoration:none}
.chiprow a:hover{border-color:var(--accent);color:var(--accent)}
.xgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin-top:16px}
.xcard{display:flex;flex-direction:column;gap:6px;background:var(--surface);border:1px solid var(--line);padding:16px;text-decoration:none;min-width:0;border-left:4px solid var(--accent)}
.xcard h3{font-size:24px}
.xcard p{margin:0;font-size:14px;color:var(--muted)}
.xcard:hover{box-shadow:0 8px 22px rgba(13,18,24,.14)}
.plan{display:flex;flex-wrap:wrap;gap:20px 32px;align-items:center;justify-content:space-between;background:var(--ink);color:var(--on-ink);padding:28px;clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%)}
.plan h2{color:var(--on-ink)}
.plan p{margin:10px 0 0;color:var(--on-ink-muted);max-width:52ch}
.plan>div:first-child{flex:1 1 320px;min-width:0}
.toc{margin:20px 0 0;padding:16px 20px;background:var(--surface);border:1px solid var(--line)}
.toc b{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.toc ol{margin:8px 0 0;padding-left:20px}
.toc li{margin:4px 0}
.toc a{color:var(--accent);font-weight:600}
.prose h2{scroll-margin-top:80px}
form.tool{background:var(--surface);border:1px solid var(--line);padding:20px;margin-top:24px;display:flex;flex-direction:column;gap:14px}
form.tool .row{display:flex;flex-wrap:wrap;gap:14px}
form.tool .row>div{flex:1 1 160px;min-width:0}
form.tool label{display:block;font-size:13px;font-weight:700;margin-bottom:6px}
form.tool input,form.tool select{width:100%;padding:12px;border:1px solid var(--line);background:var(--bg);color:var(--fg);font:inherit;border-radius:0}
form.tool button{align-self:flex-start;cursor:pointer}
.toolout{margin-top:20px}
.toolout .big{font-family:var(--display);font-size:clamp(30px,6vw,44px);text-transform:uppercase;line-height:1;margin:0 0 10px}
.toolout p{margin:0 0 10px}
.toolout .fine{font-size:13px;color:var(--muted)}
.tblwrap{overflow-x:auto;margin:14px 0}
.tblwrap table{border-collapse:collapse;width:100%;font-size:15px;background:var(--surface)}
.tblwrap th,.tblwrap td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.sres{display:flex;flex-direction:column;gap:10px}
.sitem{display:flex;flex-direction:column;gap:4px;background:var(--surface);border:1px solid var(--line);padding:14px 16px;text-decoration:none}
.sitem b{font-size:18px}
.sitem .sd{color:var(--muted);font-size:14px}
.sitem:hover{border-color:var(--accent)}
.count{font-size:13px;color:var(--muted);margin:14px 0}
.prose ol li strong{font-weight:700}