/* ============================================================
   CHEK RESEARCH — product brief pages
   Same tokens and components as the home page. No build step.
   ============================================================ */
:root{
  --accent:#1F5FA8;
  --accentText:#1F5FA8;
  --paper:#FFFFFF;
  --panel:#F7F9FC;
  --ink:#0E1726;
  --ink2:#586172;
  --line:rgba(14,23,38,.12);
  --line2:rgba(14,23,38,.06);
  --ok:#0E7C5A;
  --shadow:0 1px 2px rgba(14,23,38,.05),0 14px 34px -20px rgba(14,23,38,.13);
  --shadow-hover:0 2px 6px rgba(14,23,38,.07),0 26px 52px -22px rgba(14,23,38,.22);
  --accentSoft:color-mix(in srgb,var(--accent) 12%,transparent);
  --accentLine:color-mix(in srgb,var(--accent) 34%,transparent);
  --okSoft:color-mix(in srgb,var(--ok) 14%,transparent);
  --okLine:color-mix(in srgb,var(--ok) 32%,transparent);
  --hfont:'Geist',sans-serif;
  --mono:'Geist Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --maxw:1240px;
  --pad:48px;
  --ease:cubic-bezier(.16,1,.3,1);
  --ease2:cubic-bezier(.22,.61,.36,1);
  --motion-ease:cubic-bezier(.16,1,.3,1);
}
html[data-theme="dark"]{
  --paper:#0A1728;
  --panel:#112238;
  --ink:#EEF2F8;
  --ink2:#93A0B5;
  --line:rgba(255,255,255,.11);
  --line2:rgba(255,255,255,.06);
  --ok:#5FD39A;
  --accentText:#6FB2F5;
  --shadow:0 1px 2px rgba(0,0,0,.5),0 20px 44px -24px rgba(0,0,0,.75);
  --shadow-hover:0 2px 8px rgba(0,0,0,.6),0 30px 62px -26px rgba(0,0,0,.85);
}
*{box-sizing:border-box}
html,body{margin:0}
html{scroll-behavior:smooth}
body{
  background:var(--paper);color:var(--ink);
  font-family:'General Sans',system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  min-height:100vh;
  transition:background .5s var(--ease2),color .5s var(--ease2);
}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
h1,h2,h3{font-family:var(--hfont);margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--accentText);outline-offset:3px;border-radius:6px;box-shadow:0 0 0 4px var(--accentSoft)}
.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.section{border-bottom:1px solid var(--line)}
.mono{font-family:var(--mono)}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--accentText)}
.skip-link{position:absolute;left:-999px;top:0;z-index:200;background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:0 0 8px 0;font-size:13.5px;font-weight:600}
.skip-link:focus{left:0}

/* ---------------- header ---------------- */
.site-header{
  position:sticky;top:0;z-index:60;border-bottom:1px solid var(--line);
  background:color-mix(in srgb,var(--paper) 82%,transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:box-shadow .22s var(--motion-ease),border-color .22s var(--motion-ease),background .22s var(--motion-ease);
}
.site-header.is-scrolled{
  border-bottom-color:color-mix(in srgb,var(--ink) 16%,transparent);
  box-shadow:0 1px 0 var(--line2),0 10px 30px -22px rgba(14,23,38,.35);
  background:color-mix(in srgb,var(--paper) 90%,transparent);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding-top:18px;padding-bottom:18px}
.wordmark,.footer-mark{display:inline-flex;align-items:center;line-height:0}
.wm-logo{height:30px;width:auto;display:block}
.footer-mark .wm-logo{height:24px}
html[data-theme="dark"] .wm-logo{filter:brightness(0) invert(1)}
.wm-stack{flex-direction:column;align-items:flex-start;gap:7px}
.wm-tagline{font-family:var(--mono);font-size:9.5px;letter-spacing:.19em;text-transform:uppercase;color:var(--ink2);line-height:1;white-space:nowrap}
.nav-links{display:flex;gap:6px;font-size:14px;align-items:center}
.nav-links > a{position:relative;color:var(--ink2);padding:9px 14px;border-radius:9px;font-weight:600;transition:color .2s var(--motion-ease),background .2s var(--motion-ease),box-shadow .2s var(--motion-ease)}
.nav-links > a:hover,.nav-links > a:focus-visible{color:var(--accentText);background:var(--accentSoft)}
.nav-menu{position:relative;display:flex;align-items:center}
.nav-menu-btn{
  display:inline-flex;align-items:center;gap:7px;font-family:inherit;font-size:14px;font-weight:600;
  color:var(--ink2);background:transparent;border:0;cursor:pointer;padding:9px 14px;border-radius:9px;
  transition:color .2s var(--motion-ease),background .2s var(--motion-ease),box-shadow .2s var(--motion-ease);
}
.nav-menu-btn:hover,.nav-menu-btn:focus-visible,.nav-menu-btn[aria-expanded="true"],.nav-menu-btn.is-active{color:var(--accentText);background:var(--accentSoft)}
.nav-menu-btn.is-active{box-shadow:inset 0 0 0 1px var(--accentLine)}
.nav-caret{transition:transform .25s var(--motion-ease)}
.nav-menu-btn[aria-expanded="true"] .nav-caret{transform:rotate(180deg)}
.prod-panel{
  position:absolute;top:calc(100% + 12px);left:0;z-index:70;width:432px;padding:10px;
  display:grid;grid-template-columns:1fr 1fr;gap:2px;
  background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-hover);
  opacity:0;transform:translateY(-6px);transition:opacity .2s var(--motion-ease),transform .2s var(--motion-ease);
}
.prod-panel[hidden]{display:none}
.prod-panel.is-open{opacity:1;transform:none}
.prod-item{display:flex;flex-direction:column;gap:2px;padding:10px 12px;border-radius:10px;transition:background .18s var(--motion-ease),box-shadow .18s var(--motion-ease)}
.prod-item:hover,.prod-item:focus-visible{background:var(--accentSoft);box-shadow:inset 0 0 0 1px var(--accentLine)}
.prod-name{font-size:14.5px;font-weight:600;color:var(--ink);transition:color .18s var(--motion-ease)}
.prod-item:hover .prod-name,.prod-item:focus-visible .prod-name{color:var(--accentText)}
.prod-tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink2)}
.nav-actions{display:flex;align-items:center;gap:12px}
.icon-btn{
  width:40px;height:40px;flex:none;border-radius:9px;border:1px solid var(--line);
  background:transparent;color:var(--ink);display:flex;align-items:center;justify-content:center;
  font-size:16px;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .3s var(--ease);
}
.icon-btn:hover,.icon-btn:focus-visible{background:var(--accentSoft);border-color:var(--accentLine);color:var(--accentText)}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;cursor:pointer;border:1px solid transparent}
.btn-primary{padding:14px 24px;border-radius:9px;background:var(--ink);color:var(--paper);font-size:14.5px;box-shadow:var(--shadow);transition:transform .3s var(--ease),box-shadow .3s,opacity .2s}
.btn-primary:hover,.btn-primary:focus-visible{transform:translateY(-2px);box-shadow:var(--shadow-hover);opacity:.95}
.btn-outline{padding:14px 24px;border-radius:9px;border:1px solid var(--line);color:var(--ink);font-size:14.5px;background:transparent;transition:transform .3s var(--ease),border-color .2s,color .2s,background .2s}
.btn-outline:hover,.btn-outline:focus-visible{transform:translateY(-2px);border-color:var(--accentLine);color:var(--accentText);background:var(--accentSoft)}
.btn-nav{padding:11px 18px;border-radius:8px;background:var(--ink);color:var(--paper);font-size:13.5px;font-weight:600;box-shadow:var(--shadow);transition:transform .3s var(--ease),box-shadow .3s,opacity .2s}
.btn-nav:hover,.btn-nav:focus-visible{transform:translateY(-2px);box-shadow:var(--shadow-hover);opacity:.95}
.hamburger{display:none}
.drawer-backdrop{position:fixed;inset:0;z-index:80;background:rgba(14,23,38,.4);opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}
html[data-theme="dark"] .drawer-backdrop{background:rgba(0,0,0,.6)}
.drawer-backdrop.open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;right:0;bottom:0;z-index:90;width:min(84vw,340px);
  background:var(--paper);border-left:1px solid var(--line);box-shadow:var(--shadow-hover);
  transform:translateX(100%);transition:transform .38s var(--ease);
  display:flex;flex-direction:column;padding:22px;overflow-y:auto;
}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.drawer nav{display:flex;flex-direction:column;margin-top:14px}
.drawer nav a{font-size:17px;color:var(--ink);font-family:var(--hfont);font-weight:600;padding:12px 6px;border-bottom:1px solid var(--line2);transition:color .18s,transform .18s var(--motion-ease)}
.drawer nav a:hover,.drawer nav a:focus-visible{color:var(--accentText);transform:translateX(6px)}
.drawer-group{font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--ink2);padding:16px 6px 4px}
.drawer nav a .drawer-tag{display:block;font-family:var(--mono);font-size:10.5px;font-weight:400;letter-spacing:.08em;text-transform:uppercase;color:var(--ink2);margin-top:3px}
.drawer .btn-primary{margin-top:24px;justify-content:center}

/* ---------------- product hero ---------------- */
.p-hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center;padding-top:64px;padding-bottom:64px}
.p-h1{font-weight:700;font-size:56px;line-height:1.02;letter-spacing:-.03em;margin:18px 0 10px;text-wrap:balance}
.p-tagline{font-size:19px;line-height:1.4;color:var(--ink2);margin:0 0 20px;max-width:42ch}
.p-lead{font-size:16px;line-height:1.6;color:var(--ink2);max-width:48ch;margin:0 0 30px;text-wrap:pretty}
.p-lead b{color:var(--ink);font-weight:600}
.p-btns{display:flex;gap:14px;flex-wrap:wrap}
.p-fig{margin:0}
.frame{position:relative;border-radius:12px;border:1px solid var(--line);background:var(--panel);box-shadow:var(--shadow);overflow:hidden}
.frame-photo{background:#F2F2F2}
.frame img{display:block;width:100%;height:auto}
.frame-label{
  position:absolute;top:14px;left:14px;z-index:6;
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--accentText);
  background:color-mix(in srgb,var(--paper) 62%,transparent);padding:3px 7px;border-radius:6px;
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}

/* ---------------- specs ---------------- */
.p-body{padding-top:64px;padding-bottom:72px}
.p-h2{font-weight:700;font-size:32px;line-height:1.06;letter-spacing:-.025em;margin:0 0 10px}
.p-sub{font-size:16px;line-height:1.6;color:var(--ink2);max-width:62ch;margin:0 0 34px}
.p-specs{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.p-specs li{
  display:flex;gap:14px;align-items:flex-start;
  border:1px solid var(--line);border-radius:12px;padding:20px 22px;background:var(--panel);box-shadow:var(--shadow);
}
.check-tile{
  flex:none;width:26px;height:26px;border-radius:7px;border:1px solid var(--accentLine);background:var(--accentSoft);
  display:flex;align-items:center;justify-content:center;color:var(--accentText);font-size:13px;
}
.check-tile svg{width:14px;height:14px}
.p-specs strong{display:block;font-size:15px;color:var(--ink)}
.p-specs .cl-sub{font-size:13.5px;color:var(--ink2)}
.p-note{margin-top:34px;border-left:3px solid var(--accent);background:var(--panel);border-radius:8px;padding:14px 18px;font-size:14px;color:var(--ink2)}
.p-note b{color:var(--ink)}
.p-figrow{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:34px}
.p-cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-top:38px;padding-top:30px;border-top:1px solid var(--line)}

/* ---------------- footer ---------------- */
.site-footer .wrap{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;
  padding-top:32px;padding-bottom:32px;font-family:var(--mono);font-size:12px;color:var(--ink2);
}

/* ---------------- responsive ---------------- */
@media (max-width:1080px){
  .p-h1{font-size:48px}
}
@media (max-width:820px){
  :root{--pad:28px}
  .nav-links{display:none}
  .btn-nav{display:none}
  .hamburger{display:flex}
  .wm-tagline{display:none}
  .p-hero-grid{grid-template-columns:1fr;gap:36px;padding-top:48px;padding-bottom:48px}
  .p-h1{font-size:40px}
  .p-specs,.p-figrow{grid-template-columns:1fr}
  .p-body{padding-top:48px;padding-bottom:56px}
  .p-h2{font-size:27px}
}
@media (max-width:520px){
  :root{--pad:20px}
  .p-h1{font-size:34px}
  .p-btns .btn,.p-cta .btn{flex:1 1 auto;justify-content:center}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto !important}
  .btn,.icon-btn,.prod-item,.drawer nav a,.nav-menu-btn{transition:none !important}
  .drawer nav a:hover{transform:none !important}
}