:root{
  --bg:#E9ECEC; --surface:#FAFBFB; --sunk:#DEE3E3;
  --ink:#161A1A; --muted:#5B6666; --line:#C6CFCF;
  --accent:#0F5F62; --accent-soft:#D6E6E6;
  --warn:#B4460F; --ok:#1F6B45;
  --mono:ui-monospace,"SF Mono","Cascadia Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0F1414; --surface:#161C1C; --sunk:#0A0E0E;
    --ink:#E2E8E7; --muted:#899897; --line:#2A3434;
    --accent:#4FB0B4; --accent-soft:#123033;
    --warn:#E0673A; --ok:#4FB07A;
  }
}
:root[data-theme="dark"]{
  --bg:#0F1414; --surface:#161C1C; --sunk:#0A0E0E;
  --ink:#E2E8E7; --muted:#899897; --line:#2A3434;
  --accent:#4FB0B4; --accent-soft:#123033; --warn:#E0673A; --ok:#4FB07A;
}
:root[data-theme="light"]{
  --bg:#E9ECEC; --surface:#FAFBFB; --sunk:#DEE3E3;
  --ink:#161A1A; --muted:#5B6666; --line:#C6CFCF;
  --accent:#0F5F62; --accent-soft:#D6E6E6; --warn:#B4460F; --ok:#1F6B45;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px 64px}
a{color:var(--accent)}
nav{display:flex;align-items:baseline;gap:20px;padding:16px 0 20px;border-bottom:1px solid var(--line);margin-bottom:24px;flex-wrap:wrap}
nav .brand{font-family:var(--mono);font-weight:600;font-size:15px;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
nav a:not(.brand){font-size:13.5px;color:var(--muted);text-decoration:none}
nav a:not(.brand):hover,nav a.on{color:var(--accent)}
nav .sp{margin-left:auto}
h1{font-family:var(--mono);font-size:21px;font-weight:600;margin:0 0 4px;text-wrap:balance}
h2{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;font-weight:600}
.lede{color:var(--muted);font-size:13.5px;max-width:70ch;margin:0 0 22px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:3px;padding:16px;margin-bottom:20px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:3px;overflow:hidden;margin-bottom:20px}
.stat{background:var(--surface);padding:11px 13px}
.stat .k{font-family:var(--mono);font-size:9.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted)}
.stat .v{font-family:var(--mono);font-size:21px;font-variant-numeric:tabular-nums;margin-top:3px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:3px}
table{border-collapse:collapse;width:100%;font-size:13.5px}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);white-space:nowrap}
th{background:var(--sunk);color:var(--muted);font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;font-weight:600}
tr:last-child td{border-bottom:none}
td.num,th.num{text-align:right;font-family:var(--mono);font-variant-numeric:tabular-nums}
.chip{display:inline-block;font-family:var(--mono);font-size:10.5px;letter-spacing:.04em;background:var(--sunk);border:1px solid var(--line);border-radius:2px;padding:1px 6px;margin:1px 3px 1px 0;color:var(--muted);white-space:nowrap}
.chip b{color:var(--ink);font-weight:600}
.prov{color:var(--warn);font-family:var(--mono);font-size:10.5px;letter-spacing:.06em}
form.stack{display:flex;flex-direction:column;gap:14px}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
/* a hint is small and muted wherever it sits, not only inside a .field --
   outside one it was rendering at body size and reading as prose */
.hint,.field .hint{font-size:12px;color:var(--muted)}
input[type=text],input[type=number],select,textarea{font-family:var(--sans);font-size:14px;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:2px;padding:7px 9px;width:100%}
textarea{font-family:var(--mono);font-size:12.5px;min-height:120px;resize:vertical}
input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
button,.btn{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:2px;padding:8px 14px;cursor:pointer;text-decoration:none;display:inline-block}
button:hover,.btn:hover{border-color:var(--accent);color:var(--accent)}
button:focus-visible,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button.primary{background:var(--accent);border-color:var(--accent);color:#fff}
button.primary:hover{color:#fff;opacity:.9}
button.danger:hover{border-color:var(--warn);color:var(--warn)}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
/* /compare's five selects share the row evenly and wrap on a narrow screen,
   instead of each one sizing itself to its longest option -- "Cardiology
   (atrial fibrillation)" would otherwise push the rest off the line. */
form.controls .field{flex:1 1 150px;min-width:0}
.empty{color:var(--muted);font-size:13.5px;padding:26px 14px;text-align:center}
.notice{font-size:13px;background:var(--accent-soft);border:1px solid var(--accent);border-radius:2px;padding:9px 12px;margin:0 0 18px}
.notice code{font-family:var(--mono);font-size:11.5px}
.note{font-size:12.5px;color:var(--muted);margin:10px 0 0}
.note code{font-family:var(--mono);font-size:11.5px;color:var(--accent)}
.bar{height:6px;background:var(--accent);border-radius:1px;min-width:2px;display:block}
.diff{font-family:var(--mono);font-size:12px;line-height:1.9;background:var(--sunk);border:1px solid var(--line);border-radius:2px;padding:10px 12px;margin:8px 0 0;max-height:320px;overflow-y:auto}
.d-del{color:var(--warn);text-decoration:line-through}
.d-ins{color:var(--ok)}
.d-sub{color:var(--warn);border-bottom:1px solid var(--warn)}
.d-var{color:var(--muted);border-bottom:1px dotted var(--muted)}

/* a collapsed how-to inside a panel: shut by default, so the page reads as
   controls and the prose is there when it is wanted */
details.help{margin-top:14px;border-top:1px solid var(--line);padding-top:12px}
details.help>summary{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;color:var(--accent);cursor:pointer}
details.help>*:not(summary){font-size:12.5px;color:var(--muted);max-width:78ch}
details.help p{margin:10px 0 0}
details.help ol{margin:10px 0 0;padding-left:20px}
details.help li{margin-bottom:8px}
details.help b{color:var(--ink);font-weight:600}
details.help code{font-family:var(--mono);font-size:11.5px;color:var(--accent)}

/* capture page */
#cropWrap{position:relative;display:inline-block;max-width:100%;margin-top:14px;line-height:0;cursor:crosshair;touch-action:none}
#preview{max-width:100%;height:auto;border:1px solid var(--line);border-radius:2px;background:var(--sunk)}
#cropBox{position:absolute;border:2px solid var(--accent);background:color-mix(in srgb,var(--accent) 14%,transparent);pointer-events:none}
input[type=range]{width:100%;accent-color:var(--accent)}
progress{width:100%;height:8px;accent-color:var(--accent)}
input[readonly]{color:var(--muted);background:var(--sunk)}
input[type=file]{font-family:var(--mono);font-size:12px;color:var(--muted)}
canvas.shot{max-width:260px;height:auto;border:1px solid var(--line);border-radius:2px;display:block}
textarea.ocr{min-height:56px;font-size:12px;width:min(46ch,100%)}
#paints td{white-space:normal;vertical-align:top}
[hidden]{display:none!important}

/* a two- or three-way switch between sibling pages: /compare and
   /compare/noise, and the noise tool's own pages */
.seg{display:inline-flex;flex-wrap:wrap;border:1px solid var(--line);border-radius:3px;overflow:hidden;margin:0 0 18px}
.seg a{font-family:var(--mono);font-size:12px;letter-spacing:.03em;padding:6px 12px;text-decoration:none;color:var(--muted);background:var(--surface);border-right:1px solid var(--line)}
.seg a:last-child{border-right:none}
.seg a.on{background:var(--accent);color:#fff}
.seg a:not(.on):hover{color:var(--accent)}

/* noise tests: one card per test, the radio is the whole card */
.tests{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}
label.test{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:3px;padding:12px;cursor:pointer;background:var(--surface)}
label.test:has(input:checked){border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
label.test input{margin-top:4px;accent-color:var(--accent)}
label.test .tbody{display:flex;flex-direction:column;gap:6px;min-width:0;flex:1}
label.test audio{width:100%;height:36px}
label.test details.help{margin-top:2px;padding-top:6px}
.d-extra{background:color-mix(in srgb,var(--ok) 14%,transparent);border-radius:2px;padding:0 2px}
.seg.levels{margin:0;align-self:flex-start}
.seg.levels label{display:flex;cursor:pointer;border-right:1px solid var(--line)}
.seg.levels label:last-child{border-right:none}
.seg.levels input{position:absolute;opacity:0;pointer-events:none}
.seg.levels span{font-family:var(--mono);font-size:12.5px;padding:6px 16px;color:var(--muted);background:var(--surface)}
.seg.levels input:checked+span{background:var(--accent);color:#fff}
.seg.levels input:focus-visible+span{outline:2px solid var(--accent);outline-offset:-2px}

/* accounts: who is signed in, sign-out as a link-styled POST, the sign-in card */
nav .who{font-family:var(--mono);font-size:12.5px;color:var(--ink)}
form.inline{display:inline;margin:0}
button.link{background:none;border:none;padding:0;font-family:var(--sans);font-size:13.5px;letter-spacing:0;color:var(--muted)}
button.link:hover{color:var(--accent)}
.signin{max-width:380px;margin:40px auto 0}
.signin .or{display:flex;align-items:center;gap:10px;color:var(--muted);font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;margin:18px 0}
.signin .or::before,.signin .or::after{content:"";flex:1;border-top:1px solid var(--line)}
.signin button{width:100%}
input[type=password]{font-family:var(--sans);font-size:14px;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:2px;padding:7px 9px;width:100%}
.warnbox{font-size:13px;border:1px solid var(--warn);color:var(--warn);border-radius:2px;padding:9px 12px;margin:0 0 18px}
td form{display:inline-flex;gap:6px;align-items:center;margin:0}
td input[type=password]{width:12em;padding:5px 7px;font-size:13px}
td button{padding:5px 10px}