/* ETS website – same "Instrument" style as the app */
@font-face{font-family:'Plex Sans';src:local('IBM Plex Sans'),url(fonts/ibm-plex-sans-latin-400-normal.woff2) format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Plex Sans';src:local('IBM Plex Sans Medium'),url(fonts/ibm-plex-sans-latin-500-normal.woff2) format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Plex Sans';src:local('IBM Plex Sans SemiBold'),url(fonts/ibm-plex-sans-latin-600-normal.woff2) format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Plex Sans';src:local('IBM Plex Sans Bold'),url(fonts/ibm-plex-sans-latin-700-normal.woff2) format('woff2');font-weight:700;font-display:swap}
@font-face{font-family:'Plex Mono';src:local('IBM Plex Mono'),url(fonts/ibm-plex-mono-latin-400-normal.woff2) format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Plex Mono';src:local('IBM Plex Mono Medium'),url(fonts/ibm-plex-mono-latin-500-normal.woff2) format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Plex Mono';src:local('IBM Plex Mono SemiBold'),url(fonts/ibm-plex-mono-latin-600-normal.woff2) format('woff2');font-weight:600;font-display:swap}

:root{
  --bg:#F2F1EC; --card:#FFFFFF; --text:#1A1C1E; --muted:#62666A; --line:#1A1C1E; --hair:#CFCDC4; --grid:#E3E1DA;
  --signal:#C8401B; --signal-ink:#FFFFFF; --inv-bg:#1A1C1E; --inv-text:#F2F1EC; --ok:#2F7D4A;
  --sans:'Plex Sans','IBM Plex Sans',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:'Plex Mono','IBM Plex Mono',ui-monospace,Menlo,Consolas,monospace;
  --wrap:1180px; --gut:clamp(16px,4vw,48px);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#111315; --card:#181B1E; --text:#E9E7E0; --muted:#979B9E; --line:#E9E7E0; --hair:#33383C; --grid:#23272A;
  --signal:#FF6A40; --signal-ink:#111315; --inv-bg:#E9E7E0; --inv-text:#111315; --ok:#5FBF7F; color-scheme:dark;}}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--sans);overflow-x:hidden}
a{color:inherit}
img{max-width:100%;height:auto}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:var(--card);padding:8px 12px;z-index:10}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px}

/* header */
.top{border-bottom:1.5px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:5}
.top .wrap{display:flex;align-items:center;gap:28px;min-height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;text-decoration:none;letter-spacing:-.01em;white-space:nowrap}
.mark{width:30px;height:30px;background:var(--text);color:var(--bg);font:600 11px var(--mono);display:grid;place-items:center;letter-spacing:.04em;flex:none}
.nav{display:flex;gap:26px;flex:1}
.nav a,.top .aux a:not(.btn){font:500 12.5px var(--mono);letter-spacing:.08em;text-transform:uppercase;text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
.nav a[aria-current],.nav a:hover{border-bottom-color:var(--signal)}
.aux{display:flex;align-items:center;gap:18px}
.menu-btn{display:none;background:none;border:1.5px solid var(--line);color:var(--text);font:600 12px var(--mono);letter-spacing:.08em;height:40px;padding:0 12px;text-transform:uppercase}
@media (max-width:860px){
  .top .wrap{flex-wrap:wrap;gap:0 12px}
  .logo{flex:1}
  .menu-btn{display:block}
  .nav,.aux{display:none;width:100%}
  .top.open .nav{display:flex;flex-direction:column;gap:0;padding:6px 0}
  .top.open .aux{display:flex;padding:0 0 14px}
  .nav a{padding:12px 0;border-bottom:1px solid var(--hair)}
}

/* type + bits */
h1,h2,h3{line-height:1.12;letter-spacing:-.02em;margin:0}
h1{font-size:clamp(38px,6vw,60px);font-weight:700}
h2{font-size:clamp(26px,3.4vw,34px);font-weight:700}
h3{font-size:18px;font-weight:600;letter-spacing:0}
p{margin:0 0 14px}
.lbl{font:500 12px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}
.mono{font-family:var(--mono)}
.small{font-size:14px}
.lead{font-size:clamp(17px,2vw,19px);color:var(--muted);max-width:560px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border:1.5px solid var(--line);font:600 13px var(--mono);letter-spacing:.08em;text-transform:uppercase;background:transparent;color:var(--text);text-decoration:none;cursor:pointer}
.btn:hover{background:var(--grid)}
.btn.pri{background:var(--inv-bg);color:var(--inv-text);border-color:var(--inv-bg)}
.btn.sig{background:var(--signal);border-color:var(--signal);color:var(--signal-ink)}
.btn.pri:hover,.btn.sig:hover{filter:brightness(1.12)}
.btn[disabled]{opacity:.55;cursor:progress}
.btn.block{width:100%}
.card{background:var(--card);border:1.5px solid var(--line);padding:22px}
.tag{display:inline-block;font:600 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:3px 8px;border:1.5px solid var(--signal);color:var(--signal)}
.tag.fill{background:var(--signal);color:var(--signal-ink)}
.section{padding-top:clamp(40px,6vw,72px);padding-bottom:clamp(40px,6vw,72px)}
.rule{border-top:1.5px solid var(--line)}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media (max-width:860px){.grid3{grid-template-columns:1fr}}
.check{list-style:none;padding:0;margin:18px 0 22px}
.check li{padding:9px 0;border-top:1px solid var(--hair);display:flex;gap:10px;font-size:15px}
.check li::before{content:"";width:9px;height:9px;background:var(--signal);margin-top:8px;flex:none}
.field{display:flex;flex-direction:column;gap:6px;margin:0 0 14px}
.field label{font:500 12px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
input[type=text],input[type=email],input[type=search]{font:16px var(--sans);min-height:46px;padding:0 12px;border:1.5px solid var(--line);background:var(--card);color:var(--text);width:100%;border-radius:0}
input.key{font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase}
.msg{padding:12px 14px;border-left:3px solid var(--signal);background:var(--grid);font-size:15px;margin:12px 0}
.msg.ok{border-left-color:var(--ok)}
[hidden]{display:none!important}

/* home */
.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center;padding-top:clamp(36px,6vw,64px)}
.hero .ctas{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 12px}
.phones{position:relative;height:620px}
.phone{width:250px;border:10px solid #0b0c0d;border-radius:30px;overflow:hidden;box-shadow:0 18px 40px rgba(0,0,0,.28);background:#000;position:absolute}
.phone img{display:block;width:100%}
.phone.a{left:6%;top:40px;transform:rotate(-4deg)}
.phone.b{left:46%;top:0;z-index:2}
.facts{display:grid;grid-template-columns:repeat(3,1fr);margin-top:40px;border-top:1.5px solid var(--line)}
.facts div{padding:14px 16px 0 0}
.facts b{font:600 12px var(--mono);letter-spacing:.1em;text-transform:uppercase;display:block}
.facts span{color:var(--muted);font-size:14px}
@media (max-width:860px){
  .hero{grid-template-columns:1fr}
  .phones{height:470px;max-width:420px;margin:0 auto;width:100%}
  .phone{width:190px;border-width:8px;border-radius:24px}
  .phone.a{left:0}.phone.b{left:auto;right:0}
  .facts{grid-template-columns:1fr}
}
.feature{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1.5px solid var(--line)}
.feature > div{padding:22px 22px 26px 0;border-bottom:1px solid var(--hair)}
.feature h3{margin:8px 0 6px}
.feature p{color:var(--muted);font-size:15px}
@media (max-width:860px){.feature{grid-template-columns:1fr}}

/* pricing */
.price{font-size:44px;font-weight:700;margin:10px 0 0;line-height:1.1}
.plan{position:relative;display:flex;flex-direction:column}
.plan .check{flex:1}
.plan.main{border-width:2.5px}
.plan .tag.fill{position:absolute;top:-13px;left:20px}
.pay-note{display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap;text-align:center}

/* dialog */
dialog{border:1.5px solid var(--line);background:var(--card);color:var(--text);padding:24px;max-width:460px;width:calc(100% - 32px)}
dialog::backdrop{background:rgba(0,0,0,.55)}
dialog h2{font-size:24px;margin-bottom:10px}
.row{display:flex;gap:10px;flex-wrap:wrap}

/* licence + thanks */
.keybox{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:12px 0}
.keybox code{font:600 clamp(18px,3.6vw,24px) var(--mono);letter-spacing:.05em;word-break:break-all}
.kv{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-top:1px solid var(--hair);flex-wrap:wrap}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;border-top:1px solid var(--hair);padding-top:14px;margin-top:6px}
.stats b{display:block;font-size:18px;margin-top:4px}
@media (max-width:560px){.stats{grid-template-columns:1fr 1fr}}
.spinner{width:14px;height:14px;border:2px solid var(--hair);border-top-color:var(--signal);border-radius:50%;display:inline-block;animation:spin 1s linear infinite;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spinner{animation:none}}

/* docs */
.docs{display:grid;grid-template-columns:240px minmax(0,1fr) 200px;gap:40px;padding-top:28px;padding-bottom:60px}
.docs-side{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 100px);overflow:auto;font-size:15px}
.docs-side .grp{font:500 12px var(--mono);letter-spacing:.1em;text-transform:uppercase;margin:18px 0 4px}
.docs-side a{display:block;padding:5px 0 5px 12px;color:var(--muted);text-decoration:none;border-left:2px solid transparent}
.docs-side a[aria-current]{color:var(--text);font-weight:600;border-left-color:var(--signal)}
.docs-side a:hover{color:var(--text)}
.docs-toc{position:sticky;top:84px;align-self:start;font-size:14px}
.docs-toc a{display:block;padding:4px 0;color:var(--muted);text-decoration:none}
.docs-toc a:hover{color:var(--text)}
.prose{max-width:720px}
.prose h1{font-size:clamp(32px,4vw,40px);margin:6px 0 16px}
.prose h2{font-size:24px;margin:34px 0 10px;scroll-margin-top:84px}
.prose h3{margin:24px 0 8px;scroll-margin-top:84px}
.prose p,.prose li{font-size:16.5px}
.prose ul,.prose ol{padding-left:22px;margin:0 0 16px}
.prose li{margin:4px 0}
.prose code{font:14px var(--mono);background:var(--grid);padding:1px 5px}
.prose pre{background:var(--inv-bg);color:var(--inv-text);padding:14px 16px;overflow:auto}
.prose pre code{background:none;padding:0;color:inherit}
.prose img{border:1.5px solid var(--line);display:block;margin:14px 0}
.prose hr{border:0;border-top:1px solid var(--hair);margin:30px 0}
.callout{padding:12px 16px;border-left:3px solid var(--signal);background:var(--grid);margin:18px 0}
.callout p{margin:0}
.callout-warning,.callout-important{border-left-color:var(--signal);background:color-mix(in srgb,var(--signal) 10%,var(--card))}
blockquote{margin:16px 0;padding-left:16px;border-left:3px solid var(--hair);color:var(--muted)}
.table-wrap{overflow-x:auto;margin:14px 0}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:9px 10px 9px 0;border-bottom:1px solid var(--hair);vertical-align:top}
th{font:500 12px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border-bottom:1.5px solid var(--line)}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:40px;border-top:1.5px solid var(--line);padding-top:16px}
.pager a{text-decoration:none;max-width:48%}
.pager small{display:block;font:500 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.search{position:relative;margin-bottom:6px}
.search input{min-height:40px;font-size:15px}
.results{position:absolute;left:0;right:0;top:44px;background:var(--card);border:1.5px solid var(--line);z-index:4;max-height:60vh;overflow:auto}
.results a{display:block;padding:10px 12px;border-bottom:1px solid var(--hair);text-decoration:none}
.results a:hover,.results a.on{background:var(--grid)}
.results small{display:block;color:var(--muted);font-size:13px}
.docs-menu{display:none}
@media (max-width:1060px){.docs{grid-template-columns:220px minmax(0,1fr)}.docs-toc{display:none}}
@media (max-width:760px){
  .docs{grid-template-columns:minmax(0,1fr);gap:10px;padding-top:16px}
  .docs-menu{display:block}
  .docs-side{position:static;max-height:none;display:none;border:1.5px solid var(--line);padding:4px 14px 14px;background:var(--card)}
  .docs-side.open{display:block}
}

/* footer */
.foot{border-top:1.5px solid var(--line);margin-top:40px;padding:28px 0 40px;font-size:14px;color:var(--muted)}
.foot .wrap{display:flex;gap:24px;flex-wrap:wrap;justify-content:space-between}
.foot nav{display:flex;gap:18px;flex-wrap:wrap}
.foot a{text-decoration:none}.foot a:hover{text-decoration:underline}
.disclaimer{max-width:620px;font-size:13px}
.split{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:40px}
@media (max-width:860px){.split{grid-template-columns:1fr}}
.docs > aside,.docs > article{min-width:0}
/* admin */
.adm-grid{display:grid;grid-template-columns:minmax(0,1fr) 110px;gap:14px}
.adm-type{border:0;padding:0;margin:0 0 14px;display:grid;gap:10px}
.adm-type legend{margin-bottom:8px}
.adm-type > label{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--hair);padding:12px;cursor:pointer}
.adm-type > label:has(input:checked){border-color:var(--line)}
.adm-type > label > input{margin-top:4px}
.adm-row{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1.5fr) auto;gap:6px 16px;align-items:center;padding:14px 0;border-top:1px solid var(--hair)}
.adm-row:first-child{border-top:0}
.adm-row.revoked{opacity:.55}
.adm-row code{font:14px var(--mono);letter-spacing:.03em;word-break:break-all}
.adm-row .acts{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.adm-row .acts .btn{min-height:36px;padding:0 10px;font-size:11.5px}
.tag.plain{border-color:var(--line);color:var(--text)}
@media (max-width:700px){.adm-row{grid-template-columns:1fr}.adm-row .acts{justify-content:flex-start}.adm-grid{grid-template-columns:1fr}}
@media (max-width:520px){.logo .full{display:none}}
@media (max-width:860px){.plan.main{order:-1;margin-top:10px}}