/* Vitale Signal — Frequency concept
   Layout: an instrument panel. Oversized grotesk headlines over a live oscilloscope; mono readouts carry the data. */
@font-face{font-family:"Signal Grotesk";src:url("fonts/schibsted-grotesk-var.woff2") format("woff2"),url("fonts/schibsted-grotesk-var.woff") format("woff");font-weight:400 900;font-display:swap}

:root{
  --bg:#f4f5f8; --surface:#ffffff; --ink:#14161b; --muted:#585e6a; --line:#dce0e7; --soft:#e9ecf1;
  --signal:#d74418; --signal-ink:#b5360f; --signal-cool:#97a0b2; --on-signal:#ffffff;
  --glass:rgba(244,245,248,.74); --grid:rgba(20,22,27,.055); --shadow:0 1px 2px rgba(20,22,27,.05),0 12px 32px -12px rgba(20,22,27,.14);
  --display:"Signal Grotesk",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono","Cascadia Mono",Menlo,Consolas,monospace;
  --max:1320px; --gutter:clamp(16px,4vw,56px); --r:18px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0b0d11; --surface:#141820; --ink:#f1f2f5; --muted:#a1a8b5; --line:#262c36; --soft:#1a1f28;
  --signal:#ff7643; --signal-ink:#ff9068; --signal-cool:#4f5869; --on-signal:#160803;
  --glass:rgba(11,13,17,.72); --grid:rgba(241,242,245,.05); --shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -16px rgba(0,0,0,.6);
  color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0b0d11; --surface:#141820; --ink:#f1f2f5; --muted:#a1a8b5; --line:#262c36; --soft:#1a1f28;
  --signal:#ff7643; --signal-ink:#ff9068; --signal-cool:#4f5869; --on-signal:#160803;
  --glass:rgba(11,13,17,.72); --grid:rgba(241,242,245,.05); --shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -16px rgba(0,0,0,.6);
  color-scheme:dark}

*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;scroll-padding-top:88px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.6 var(--display);-webkit-font-smoothing:antialiased;overflow-x:clip}
h1,h2,h3,p,ul,ol,figure{margin:0}ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
img,canvas,svg{display:block;max-width:100%}
:focus-visible{outline:2.5px solid var(--signal);outline-offset:3px;border-radius:6px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:fixed;left:16px;top:-60px;z-index:100;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px}
.skip:focus{top:12px}
.wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(72px,10vw,140px)}
.fine{font-size:13px;color:var(--muted);line-height:1.6}
.center{text-align:center;margin-top:28px}
.mono-label{font:500 11.5px/1.4 var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--ink)}
.mono-label.dim,.dim{color:var(--muted)}
h2{font-size:clamp(38px,5.6vw,80px);line-height:.98;letter-spacing:-.045em;font-weight:640;text-wrap:balance}
h3{font-size:clamp(22px,2vw,27px);line-height:1.15;letter-spacing:-.025em;font-weight:620;text-wrap:balance}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:14px 26px;border-radius:999px;border:0;background:var(--signal);color:var(--on-signal);font-weight:650;font-size:15px;letter-spacing:-.01em;line-height:1.2;transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s,filter .2s;box-shadow:0 8px 24px -10px color-mix(in srgb,var(--signal) 70%,transparent);will-change:transform}
.btn:hover{filter:brightness(1.06);box-shadow:0 14px 34px -12px color-mix(in srgb,var(--signal) 85%,transparent)}
.btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}
.btn-sm{min-height:42px;padding:10px 18px;font-size:14px}
.icon-btn{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:transparent;font-size:22px;line-height:1;transition:background .2s,border-color .2s}
.icon-btn:hover{background:var(--soft)}
.chip-btn{min-height:40px;padding:8px 16px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font-size:14px;font-weight:560;transition:border-color .2s,background .2s}
.chip-btn:hover{border-color:var(--ink)}
.link-arrow{display:inline-flex;align-items:center;gap:8px;min-height:44px;font-weight:600;font-size:15px;border-bottom:1.5px solid var(--line);transition:border-color .2s,gap .2s}
.link-arrow:hover{border-color:var(--signal);gap:12px}

/* scroll meter */
.scroll-meter{position:fixed;inset:0 0 auto;height:2px;z-index:60;background:var(--signal);transform-origin:0 50%;transform:scaleX(0);pointer-events:none}
@supports (animation-timeline:scroll()){
  .scroll-meter{animation:meter linear both;animation-timeline:scroll(root)}
  @keyframes meter{to{transform:scaleX(1)}}
}

/* header */
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;transition:background .3s,border-color .3s,backdrop-filter .3s;border-bottom:1px solid transparent}
.site-header.scrolled{background:var(--glass);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);border-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:72px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:19px;letter-spacing:-.03em;font-weight:520}
.brand b{font-weight:720}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--ink);color:var(--bg)}
.brand-mark svg path{stroke:var(--signal)}
.nav-links{display:flex;gap:4px}
.nav-links a{padding:8px 13px;border-radius:999px;font-size:14.5px;font-weight:540;color:var(--muted);transition:color .2s,background .2s}
.nav-links a:hover,.nav-links a[aria-current="true"]{color:var(--ink);background:var(--soft)}
.nav-actions{display:flex;align-items:center;gap:10px}
.kbd-button{display:inline-flex;align-items:center;gap:8px;height:42px;padding:0 10px 0 13px;border-radius:999px;border:1px solid var(--line);background:transparent;color:var(--muted)}
.kbd-button:hover{color:var(--ink);border-color:var(--ink)}
kbd{font:500 11px var(--mono);padding:3px 6px;border-radius:6px;border:1px solid var(--line);background:var(--soft);color:var(--muted)}
.theme-toggle .i-sun{display:none}
:root[data-theme="dark"] .theme-toggle .i-sun{display:block}
:root[data-theme="dark"] .theme-toggle .i-moon{display:none}

/* hero */
.hero{position:relative;display:grid;grid-template-columns:minmax(0,1fr);padding-top:clamp(32px,5vw,72px)}
.hero-inner{order:1;position:relative;z-index:2}
.hero .scope{order:2}
.hero > .wrap:last-child{order:3}
.hero-status{display:flex;align-items:center;gap:10px;margin-bottom:28px;color:var(--muted)}
.hero-status .sep{opacity:.5}
.status-dot{width:8px;height:8px;border-radius:50%;background:var(--signal-cool);box-shadow:0 0 0 0 transparent;transition:background .4s}
.hero.locked .status-dot{background:var(--signal);animation:pulse 2.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--signal) 55%,transparent)}70%{box-shadow:0 0 0 10px transparent}100%{box-shadow:0 0 0 0 transparent}}
.hero-title{font-size:clamp(50px,9.6vw,150px);line-height:.9;letter-spacing:-.06em;font-weight:660;max-width:12ch}
.hero-title .line{display:block}
.hero-title em{font-style:normal;color:var(--signal);position:relative;white-space:nowrap}
.hero-row{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:24px 48px;margin-top:30px}
.hero-sub{max-width:46ch;font-size:clamp(18px,1.6vw,21px);line-height:1.5;color:var(--muted)}
.hero-cta{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px}
@media (prefers-reduced-motion:no-preference){
  .hero-title .line{animation:rise 1s cubic-bezier(.2,.8,.2,1) both}
  .hero-title .line:nth-child(2){animation-delay:.08s}
  .hero-sub,.hero-cta{animation:rise 1s .16s cubic-bezier(.2,.8,.2,1) both}
  @keyframes rise{from{transform:translateY(24px);opacity:.001}}
}
.scope{position:relative;height:clamp(200px,24vw,340px);margin-top:clamp(8px,2vw,24px);border-block:1px solid var(--line);overflow:hidden}
.scope canvas{position:absolute;inset:0;width:100%;height:100%;z-index:1}
.scope-grid{position:absolute;inset:0;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:100% 25%,calc(100% / 12) 100%;background-position:0 -1px,-1px 0}
.scope-grid::after{content:"";position:absolute;left:0;right:0;top:50%;border-top:1px dashed color-mix(in srgb,var(--ink) 14%,transparent)}

.tuner{position:relative;z-index:3;display:grid;grid-template-columns:minmax(0,1.4fr) auto minmax(0,1.6fr);align-items:center;gap:20px 36px;margin-top:-34px;padding:18px 26px;border-radius:var(--r);background:var(--glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--line);box-shadow:var(--shadow)}
.tuner-dial{display:grid;gap:8px}
.dial-track{display:flex;align-items:center;gap:12px}
.dial-track input{flex:1;min-width:0}
input[type=range]{-webkit-appearance:none;appearance:none;height:30px;background:transparent;cursor:pointer;touch-action:pan-y}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:linear-gradient(90deg,var(--signal) var(--fill,50%),var(--line) var(--fill,50%))}
input[type=range]::-moz-range-track{height:4px;border-radius:4px;background:var(--line)}
input[type=range]::-moz-range-progress{height:4px;border-radius:4px;background:var(--signal)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;margin-top:-9px;border-radius:50%;background:var(--surface);border:2px solid var(--signal);box-shadow:0 2px 8px rgba(0,0,0,.18);transition:transform .15s}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--surface);border:2px solid var(--signal)}
input[type=range]:active::-webkit-slider-thumb{transform:scale(1.15)}
.tuner-readout{display:grid;justify-items:start;gap:2px;padding-inline:24px;border-inline:1px solid var(--line)}
.snr{font:600 26px/1 var(--mono);letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:var(--ink);min-width:9ch}
.tuner-lamps{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:14.5px;font-weight:560}
.tuner-lamps li{display:flex;align-items:center;gap:8px;color:var(--muted);transition:color .3s}
.tuner-lamps i{width:9px;height:9px;border-radius:50%;background:var(--line);transition:background .3s,box-shadow .3s}
.tuner-lamps li.on{color:var(--ink)}
.tuner-lamps li.on i{background:var(--signal);box-shadow:0 0 12px var(--signal)}

/* ticker */
.ticker{overflow:hidden;border-bottom:1px solid var(--line);padding-block:18px;margin-top:clamp(48px,6vw,72px);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.ticker-track{display:flex;gap:28px;width:max-content;font-size:clamp(20px,2.2vw,30px);font-weight:560;letter-spacing:-.03em;white-space:nowrap}
.ticker-track i{font-style:normal;color:var(--signal);font-size:.5em;align-self:center}
@media (prefers-reduced-motion:no-preference){.ticker-track{animation:tick 38s linear infinite}@keyframes tick{to{transform:translateX(-50%)}}}

/* section heads */
.section-head{display:grid;gap:18px;max-width:880px;margin:0 auto clamp(40px,6vw,72px);text-align:center;justify-items:center}
.section-head.left{text-align:left;justify-items:start;margin-inline:0}
.section-intro{max-width:56ch;font-size:clamp(17px,1.4vw,19px);color:var(--muted);line-height:1.55}

/* reveal: visible at rest, animated where scroll timelines exist */
@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .reveal{animation:reveal linear both;animation-timeline:view();animation-range:entry 0% entry 55%}
    @keyframes reveal{from{opacity:.35;transform:translateY(32px)}}
  }
}

/* spotlight cards */
.spot{position:relative;isolation:isolate}
.spot::before{content:"";position:absolute;inset:0;border-radius:inherit;z-index:-1;opacity:0;transition:opacity .35s;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),color-mix(in srgb,var(--signal) 14%,transparent),transparent 60%)}
.spot::after{content:"";position:absolute;inset:-1px;border-radius:inherit;z-index:-1;padding:1px;opacity:0;transition:opacity .35s;background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),var(--signal),transparent 70%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
.spot:hover::before,.spot:hover::after{opacity:1}

/* channels */
.channels{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;perspective:1400px}
.channel{display:flex;flex-direction:column;gap:14px;padding:26px;border-radius:24px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .5s cubic-bezier(.2,.8,.2,1);transform:rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg));transform-style:preserve-3d}
.channel > p{color:var(--muted);font-size:16px}
.channel-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.channel-head .mono-label{color:var(--muted)}
.ch-led{flex:none;width:8px;height:8px;border-radius:50%;background:var(--signal);box-shadow:0 0 10px var(--signal)}
.ticks{display:grid;gap:6px;margin-top:auto;padding-top:10px;border-top:1px solid var(--line);font-size:14.5px}
.ticks li{display:flex;gap:10px;align-items:baseline}
.ticks li::before{content:"";flex:none;width:12px;height:2px;background:var(--signal);transform:translateY(-4px)}
.demo{position:relative;border-radius:16px;background:var(--bg);border:1px solid var(--line);padding:14px;min-height:200px;overflow:hidden;font-size:13px}
/* search demo */
.search-bar{display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:999px;background:var(--surface);border:1px solid var(--line);color:var(--muted)}
.typed{color:var(--ink);font-weight:520;white-space:nowrap;overflow:hidden}
.caret{width:1.5px;height:15px;background:var(--signal);animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.results{display:grid;gap:8px;margin-top:12px}
.result{display:grid;gap:5px;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:var(--surface)}
.r-muted b,.r-muted span{display:block;height:8px;border-radius:4px;background:var(--soft)}
.r-muted b{width:46%}.r-muted span{width:78%}
.r-you{border-color:color-mix(in srgb,var(--signal) 55%,var(--line));box-shadow:0 0 0 4px color-mix(in srgb,var(--signal) 10%,transparent);transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.r-you strong{font-size:14px}
.r-you span{color:var(--muted);font-size:12px}
.r-you em{font-style:normal;font-weight:650;color:var(--signal-ink);font-size:12px}
.demo-search.hit .r-you{transform:scale(1.025)}
/* board demo */
.cols,.lanes{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.cols span{font:500 10px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding-bottom:6px;border-bottom:1px solid var(--line)}
.lanes{position:relative;height:126px;margin-top:8px}
.lead{position:absolute;left:0;width:calc(25% - 4.5px);padding:6px 7px;border-radius:9px;background:var(--surface);border:1px solid var(--line);font-size:10.5px;line-height:1.25;font-weight:560;transition:transform .8s cubic-bezier(.65,0,.35,1),border-color .4s,background .4s;box-shadow:0 2px 6px rgba(0,0,0,.05)}
.lead small{display:block;color:var(--muted);font-weight:450;font-size:9.5px}
.lead.won{border-color:var(--signal);background:color-mix(in srgb,var(--signal) 9%,var(--surface))}
.board-foot{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;margin-top:8px}
.ping{font-size:11px;font-weight:600;padding:4px 9px;border-radius:999px;background:color-mix(in srgb,var(--signal) 12%,transparent);color:var(--signal-ink);opacity:0;transform:translateY(6px);transition:opacity .4s,transform .4s}
.ping.show{opacity:1;transform:none}
.board-foot b{color:var(--ink)}
/* chart demo */
.seg{display:inline-flex;padding:3px;border-radius:999px;background:var(--surface);border:1px solid var(--line)}
.seg button{border:0;background:transparent;padding:6px 12px;min-height:32px;border-radius:999px;font-size:12px;font-weight:600;color:var(--muted);transition:background .25s,color .25s}
.seg button[aria-checked="true"]{background:var(--ink);color:var(--bg)}
#trend{width:100%;height:118px;margin-top:10px;overflow:visible}
#trend .raw{fill:none;stroke:var(--signal-cool);stroke-width:1.4;vector-effect:non-scaling-stroke;transition:opacity .5s}
#trend .smooth{fill:none;stroke:var(--signal);stroke-width:2.6;stroke-linecap:round;vector-effect:non-scaling-stroke;transition:stroke-dashoffset 1.1s cubic-bezier(.2,.8,.2,1),opacity .4s}
#trend .area{fill:url(#trend-fill);transition:opacity .5s}
#trend .gridl{stroke:var(--line);stroke-width:1;vector-effect:non-scaling-stroke}
#trend .end{fill:var(--signal)}
.demo-chart[data-view="raw"] .smooth,.demo-chart[data-view="raw"] .area,.demo-chart[data-view="raw"] .end{opacity:0}
.demo-chart[data-view="signal"] .raw{opacity:.35}
.chart-foot{display:flex;justify-content:space-between;gap:8px;margin-top:8px;font-size:10px}

/* signal check */
.check-section{background:linear-gradient(180deg,transparent,color-mix(in srgb,var(--soft) 70%,transparent) 18%,color-mix(in srgb,var(--soft) 70%,transparent) 82%,transparent)}
.check{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(28px,5vw,72px);align-items:start}
.check .section-head{margin-bottom:32px}
.check-tools{display:flex;gap:10px;flex-wrap:wrap}
.statements{display:grid;gap:12px;counter-reset:q}
.statement{display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px 16px;align-items:center;margin:0;padding:18px 20px;border:1px solid var(--line);border-radius:18px;background:var(--surface);transition:border-color .3s,box-shadow .3s}
.statement.done{border-color:color-mix(in srgb,var(--signal) 35%,var(--line))}
.statement legend{display:contents}
.statement .q-ch{grid-column:1;font:500 10.5px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--signal-ink);padding:4px 8px;border-radius:6px;background:color-mix(in srgb,var(--signal) 10%,transparent);white-space:nowrap}
.statement .q-text{grid-column:2;font-size:16.5px;font-weight:540;line-height:1.4}
.opts{grid-column:1 / -1;display:grid;grid-template-columns:repeat(3,1fr);gap:4px;margin-top:10px;padding:4px;border-radius:14px;background:var(--bg);border:1px solid var(--line)}
.opts label{position:relative;display:grid;place-items:center;min-height:42px;border-radius:10px;font-size:14px;font-weight:580;color:var(--muted);cursor:pointer;transition:background .2s,color .2s}
.opts input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.opts label:hover{color:var(--ink)}
.opts label:has(input:checked){background:var(--ink);color:var(--bg)}
.opts label:has(input:focus-visible){outline:2.5px solid var(--signal);outline-offset:2px}
.meter-panel{position:sticky;top:96px}
.meter-card{padding:24px;border-radius:24px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);display:grid;gap:22px}
.meter-top{display:flex;justify-content:space-between;gap:12px}
.meters{display:grid;gap:16px}
.meter{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 12px;align-items:center}
.meter-name{font-weight:620;font-size:15px}
.meter-val{font:600 15px var(--mono);font-variant-numeric:tabular-nums;color:var(--muted);min-width:4ch;text-align:right}
.leds{grid-column:1 / -1;display:grid;grid-template-columns:repeat(20,1fr);gap:3px}
.leds i{height:16px;border-radius:3px;background:var(--soft);transition:background .3s,box-shadow .3s}
.leds i.on{background:var(--signal);box-shadow:0 0 8px color-mix(in srgb,var(--signal) 45%,transparent)}
.leds i.on.lo{background:color-mix(in srgb,var(--signal) 55%,var(--signal-cool))}
.meter.weak .meter-name::after{content:"Start here";margin-left:10px;font:600 10px var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:3px 7px;border-radius:6px;background:var(--signal);color:var(--on-signal);vertical-align:2px}
.meter.idle .leds i{animation:idle 2.4s ease-in-out infinite;animation-delay:calc(var(--i) * 60ms)}
@keyframes idle{0%,100%{background:var(--soft)}50%{background:color-mix(in srgb,var(--signal-cool) 35%,var(--soft))}}
@media (prefers-reduced-motion:reduce){.meter.idle .leds i{animation:none}}
.verdict{padding-top:18px;border-top:1px solid var(--line);display:grid;gap:8px}
.verdict-text{font-size:19px;line-height:1.35;font-weight:600;letter-spacing:-.02em}
.verdict-text span{color:var(--signal-ink)}
.verdict p:not(.mono-label):not(.verdict-text){color:var(--muted);font-size:15px}
.brief-builder{display:grid;gap:16px}
.chips{border:0;margin:0;padding:0;display:grid;gap:10px}
.chips legend{margin-bottom:10px;padding:0}
.chip-row{display:flex;flex-wrap:wrap;gap:6px}
.chip-row label{position:relative;display:inline-flex;align-items:center;min-height:38px;padding:7px 14px;border-radius:999px;border:1px solid var(--line);font-size:13.5px;font-weight:560;cursor:pointer;transition:all .2s}
.chip-row input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.chip-row label:has(input:checked){background:var(--ink);color:var(--bg);border-color:var(--ink)}
.chip-row label:has(input:focus-visible){outline:2.5px solid var(--signal);outline-offset:2px}

/* model */
.model{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(24px,4vw,56px);align-items:start}
.model-inputs{display:grid;gap:22px;padding:28px;border-radius:24px;border:1px solid var(--line);background:var(--surface)}
.field{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 12px;align-items:center}
.field label{font-size:14.5px;font-weight:560;color:var(--muted)}
.field input[type=range]{grid-column:1 / -1;width:100%}
.field output{font:600 22px var(--mono);font-variant-numeric:tabular-nums}
.field-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field-pair .field{grid-template-columns:1fr}
.num{display:flex;align-items:center;gap:6px;min-height:52px;padding:0 16px;border-radius:14px;border:1px solid var(--line);background:var(--bg);font:600 18px var(--mono);transition:border-color .2s}
.num:focus-within{border-color:var(--signal)}
.num input{width:100%;min-width:0;border:0;background:transparent;font:inherit;font-variant-numeric:tabular-nums;outline:none;padding:0}
.num span{color:var(--muted)}
.error{font-size:14px;color:var(--signal-ink);font-weight:560}
.model-out{display:grid;gap:22px}
.flow{position:relative;height:190px;border-radius:24px;border:1px solid var(--line);background:var(--surface);overflow:hidden}
.flow canvas{position:absolute;inset:0;width:100%;height:100%}
.flow-labels{position:absolute;inset:auto 0 10px;display:grid;grid-template-columns:repeat(3,1fr);font:500 10.5px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.flow-labels span{padding-left:16px}
.model-table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.model-table th,.model-table td{padding:12px 8px;text-align:right;border-bottom:1px solid var(--line);font-size:16px}
.model-table thead th{font:500 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.model-table tbody th{text-align:left;font-weight:620}
.model-table td{font:500 17px var(--mono)}
.row-then td{color:var(--signal-ink);font-weight:650}
.key{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:10px;vertical-align:0}
.key-now{background:var(--signal-cool)}.key-then{background:var(--signal)}
.model-diff{display:grid;gap:6px}
.big{font-size:clamp(56px,7vw,104px);line-height:.9;letter-spacing:-.05em;font-weight:680;color:var(--ink)}
.diff-sub{color:var(--muted);font-weight:540}
.formula summary{cursor:pointer;font-weight:600;font-size:15px;min-height:44px;display:flex;align-items:center}
.formula p{color:var(--muted);font-size:15px;max-width:60ch}

/* process */
.process{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px;--p:1}
.process::before{content:"";position:absolute;left:0;right:0;top:22px;height:2px;background:var(--line)}
.process::after{content:"";position:absolute;left:0;right:0;top:22px;height:2px;background:var(--signal);transform-origin:0 50%}
@supports (animation-timeline:view()){@media (prefers-reduced-motion:no-preference) and (min-width:861px){
  .process::after{animation:grow linear both;animation-timeline:view();animation-range:entry 20% cover 55%}
  @keyframes grow{from{transform:scaleX(0)}}
}}
.process li{position:relative;z-index:1;display:grid;gap:18px;align-content:start}
.step-n{position:relative;display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:var(--bg);border:2px solid var(--signal);font:600 16px var(--mono);color:var(--signal-ink);transition:background .45s,color .45s,box-shadow .45s,border-color .45s}
.step-tag{color:var(--signal-ink);margin-bottom:6px}
.process h3{margin-bottom:8px}
.process p{color:var(--muted);font-size:16px}
.process .step-tag{font-size:11.5px;color:var(--signal-ink)}
.path-readout{display:none}

/* mobile + tablet: scroll-driven signal path */
@media (max-width:860px){
  .process{grid-template-columns:1fr;gap:0;padding-left:64px}
  .process::before,.process::after{display:block;left:22px;right:auto;top:8px;bottom:8px;width:2px;height:auto}
  .process::after{transform-origin:50% 0;transform:scaleY(var(--p));animation:none;box-shadow:0 0 14px var(--signal)}
  .process li{display:block;padding-bottom:56px}
  .process li:last-child{padding-bottom:8px}
  .step-n{position:absolute;left:-64px;top:0;z-index:2}
  .step-body{padding:22px 20px;border-radius:22px;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow)}
  .path-head{position:absolute;z-index:3;left:17px;top:calc(8px + var(--p) * (100% - 16px));width:12px;height:12px;margin-top:-6px;border-radius:50%;background:var(--signal);box-shadow:0 0 0 5px color-mix(in srgb,var(--signal) 22%,transparent),0 0 24px 4px var(--signal);pointer-events:none}
  .path-readout{position:sticky;top:calc(env(safe-area-inset-top,0px) + 80px);z-index:5;display:flex;align-items:center;gap:12px;margin:-12px 0 36px;padding:10px 16px;border-radius:999px;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4);box-shadow:var(--shadow)}
  .path-readout b{color:var(--signal-ink);font-weight:700}
  .path-name{font-weight:640;font-size:15px;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
  .path-bar{flex:1;height:3px;border-radius:3px;background:var(--line);overflow:hidden;min-width:40px}
  .path-bar i{display:block;height:100%;background:var(--signal);transform-origin:0 50%;transform:scaleX(var(--p,0))}
  .js-path .process li .step-body{transition:opacity .6s cubic-bezier(.2,.8,.2,1),filter .6s,transform .6s cubic-bezier(.2,.8,.2,1),border-color .5s}
  .js-path .process li:not(.on) .step-body{opacity:.42;filter:blur(2.5px) saturate(.4);transform:translateX(14px) scale(.98)}
  .js-path .process li:not(.on) .step-n{border-color:var(--line);color:var(--muted)}
  .js-path .process li.on .step-n{background:var(--signal);border-color:var(--signal);color:var(--on-signal);box-shadow:0 0 0 6px color-mix(in srgb,var(--signal) 16%,transparent),0 0 22px color-mix(in srgb,var(--signal) 55%,transparent)}
  .js-path .process li.current .step-body{border-color:color-mix(in srgb,var(--signal) 50%,var(--line))}
  .js-path .process li.current .step-n::after{content:"";position:absolute;inset:-4px;border-radius:50%;border:2px solid var(--signal);animation:lockring 1.6s cubic-bezier(.2,.8,.2,1) infinite}
  @keyframes lockring{from{transform:scale(.9);opacity:.9}to{transform:scale(1.9);opacity:0}}
}
@media (min-width:861px) and (max-width:1080px){
  .process{grid-template-columns:1fr 1fr;row-gap:40px}
  .process::before,.process::after{display:none}
}
@media (max-width:860px) and (prefers-reduced-motion:reduce){
  .js-path .process li:not(.on) .step-body{opacity:1;filter:none;transform:none}
  .js-path .process li.current .step-n::after{animation:none}
}

/* care */
.care{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:28px clamp(28px,5vw,72px);align-items:start}
.plans{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.plan{display:grid;gap:12px;align-content:start;padding:28px;border-radius:24px;border:1px solid var(--line);background:var(--surface)}
.plan .mono-label{color:var(--signal-ink)}
.plan p:last-child{color:var(--muted);font-size:16px}
.principles{grid-column:1 / -1;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin-top:clamp(24px,4vw,48px);padding-top:32px;border-top:1px solid var(--line)}
.principles li{color:var(--muted);font-size:15.5px}
.principles strong{display:block;color:var(--ink);font-weight:640;font-size:17px;margin-bottom:4px}

/* faq */
.faq{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(28px,5vw,72px)}
.faq-list{border-top:1px solid var(--line)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:72px;padding-block:14px;cursor:pointer;font-size:clamp(18px,1.6vw,21px);font-weight:600;letter-spacing:-.02em;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";flex:none;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;border:1px solid var(--line);font-weight:400;transition:transform .3s,background .3s}
.faq-list details[open] summary::after{transform:rotate(45deg);background:var(--signal);color:var(--on-signal);border-color:var(--signal)}
.faq-list details p{padding-bottom:24px;color:var(--muted);max-width:62ch}
.faq-list details::details-content{transition:content-visibility .4s allow-discrete,block-size .4s;block-size:0;overflow:clip}
.faq-list details[open]::details-content{block-size:auto}
@supports (interpolate-size:allow-keywords){:root{interpolate-size:allow-keywords}}

/* contact */
.contact{position:relative;overflow:hidden;padding-block:clamp(90px,12vw,150px) clamp(190px,22vw,300px);border-top:1px solid var(--line)}
.contact canvas{position:absolute;left:0;right:0;bottom:0;width:100%;height:clamp(170px,20vw,280px)}
.contact-inner{position:relative;z-index:1;display:grid;gap:22px;justify-items:center;text-align:center}
.contact h2{font-size:clamp(42px,6.6vw,96px)}
.contact-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:14px 20px;margin-top:10px}
.email-big{font-size:clamp(22px,3.2vw,40px);font-weight:620;letter-spacing:-.035em;border-bottom:2px solid var(--signal);padding-bottom:4px;word-break:break-word;background:var(--glass);border-radius:6px 6px 0 0;padding-inline:6px}

/* footer, dock */
.site-footer{border-top:1px solid var(--line);padding-block:32px calc(32px + env(safe-area-inset-bottom,0px))}
.foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.foot p{color:var(--muted);font-size:15px}
.foot nav{display:flex;gap:20px;font-size:14.5px;font-weight:560}
.foot nav a{min-height:44px;display:inline-flex;align-items:center}
.dock{display:none}

/* dialogs */
dialog{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:24px;box-shadow:0 30px 80px -20px rgba(0,0,0,.4);padding:0;max-width:min(640px,calc(100vw - 32px));width:100%}
dialog::backdrop{background:color-mix(in srgb,var(--bg) 40%,rgba(0,0,0,.45));backdrop-filter:blur(6px)}
@media (prefers-reduced-motion:no-preference){
  dialog[open]{animation:pop .35s cubic-bezier(.2,.8,.2,1)}
  @keyframes pop{from{opacity:0;transform:translateY(14px) scale(.98)}}
}
#brief-dialog{padding:26px}
.dlg-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
#brief-dialog h2{font-size:clamp(28px,4vw,40px);margin-bottom:16px}
.brief-text{margin:0 0 18px;padding:18px;border-radius:14px;background:var(--bg);border:1px solid var(--line);font:13px/1.6 var(--mono);white-space:pre-wrap;max-height:46vh;overflow:auto}
.dlg-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:12px}
#palette{margin-top:12vh;max-width:min(580px,calc(100vw - 32px))}
.pal-search{display:flex;align-items:center;gap:12px;padding:16px 18px;border-bottom:1px solid var(--line);color:var(--muted)}
.pal-search input{flex:1;min-width:0;border:0;background:transparent;font-size:17px;outline:none;color:var(--ink)}
#pal-list{max-height:52vh;overflow:auto;padding:8px}
#pal-list li{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;cursor:pointer;font-weight:560}
#pal-list li small{font:500 10.5px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
#pal-list li[aria-selected="true"]{background:var(--soft)}
#pal-list li[aria-selected="true"] small{color:var(--signal-ink)}
#pal-list .empty{color:var(--muted);cursor:default}

#toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));z-index:90;transform:translate(-50%,20px);opacity:0;pointer-events:none;padding:12px 18px;border-radius:999px;background:var(--ink);color:var(--bg);font-size:14px;font-weight:600;transition:opacity .3s,transform .3s}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* theme reveal */
::view-transition-old(root),::view-transition-new(root){animation:none;mix-blend-mode:normal}

/* responsive */
@media (max-width:1080px){
  .nav-links{display:none}
  .channels{grid-template-columns:1fr 1fr}
  .channels .channel:last-child{grid-column:1 / -1}
  .tuner{grid-template-columns:1fr auto}
  .tuner-lamps{grid-column:1 / -1}
  .tuner-readout{border-inline:0;border-left:1px solid var(--line);padding-right:0}
  .principles{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .check,.model,.care,.faq{grid-template-columns:1fr}
  .meter-panel{position:static}
  .plans{grid-template-columns:1fr}
}
@media (max-width:680px){
  body{font-size:16px}
  .nav-actions .btn,.kbd-hint{display:none}
  .kbd-button{padding:0;width:42px;justify-content:center}
  .channels{grid-template-columns:1fr}
  .channels .channel:last-child{grid-column:auto}
  .channel{padding:20px}
  .tuner{grid-template-columns:1fr;margin-top:-24px;padding:16px 18px;gap:14px}
  .tuner-readout{border:0;padding:0;display:flex;align-items:baseline;gap:10px}
  .tuner{container-type:inline-size}
  .tuner > *{min-width:0}
  .tuner-lamps{flex-wrap:nowrap;gap:8px;font-size:clamp(10.5px,3.55cqi,14px);letter-spacing:-.01em;white-space:nowrap;justify-content:space-between}
  .tuner-lamps li{gap:5px}
  .tuner-lamps i{width:6px;height:6px;flex:none}
  .principles{grid-template-columns:1fr}
  .field-pair{grid-template-columns:1fr}
  .model-table th,.model-table td{padding:10px 4px;font-size:14px}
  .model-table td{font-size:14px}
  .statement{padding:16px}
  .dock{display:flex;position:fixed;z-index:40;left:12px;right:12px;bottom:calc(12px + env(safe-area-inset-bottom,0px));justify-content:space-between;align-items:center;gap:10px;padding:8px 8px 8px 20px;border-radius:999px;background:var(--glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--line);box-shadow:var(--shadow);font-weight:600;font-size:15px;transition:transform .35s,opacity .35s}
  .dock.hide{transform:translateY(140%);opacity:0}
  .site-footer{padding-bottom:calc(100px + env(safe-area-inset-bottom,0px))}
  #toast{bottom:calc(90px + env(safe-area-inset-bottom,0px))}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition-duration:.01ms!important}}


/* ===== v3 additions ===== */
.btn-lg{min-height:58px;padding:16px 28px;font-size:16px}
.btn-arrow{display:inline-block;transition:transform .3s cubic-bezier(.2,.8,.2,1)}
.btn:hover .btn-arrow{transform:translateX(4px)}
.link-btn{background:none;border:0;padding:6px 2px;min-height:40px;font-weight:600;font-size:14.5px;color:var(--ink);text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:4px;cursor:pointer}
.link-btn:hover{text-decoration-color:var(--signal)}
.link-btn:disabled{opacity:.35;cursor:not-allowed}

/* how-it-works steps (teaser + check page) */
.how-steps{display:flex;flex-wrap:wrap;gap:10px 22px;counter-reset:none;font-size:15px;font-weight:560;color:var(--muted)}
.how-steps li{display:flex;align-items:center;gap:10px}
.how-steps b{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;border:1.5px solid var(--line);font:600 12px var(--mono);color:var(--ink);transition:all .3s}
.how-steps li.now{color:var(--ink)}
.how-steps li.now b{background:var(--signal);border-color:var(--signal);color:var(--on-signal)}
.how-steps li.done b{border-color:var(--signal);color:var(--signal-ink)}

/* home teaser */
.teaser{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(28px,5vw,72px);align-items:center}
.teaser .section-head{margin-bottom:0;gap:22px}
.teaser-card{display:grid;gap:20px;padding:26px;border-radius:26px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .4s cubic-bezier(.2,.8,.2,1)}
.teaser-card:hover{transform:translateY(-4px)}
.teaser-q{padding-top:18px;border-top:1px solid var(--line);display:grid;gap:10px}
.teaser-text{font-size:18px;font-weight:600;letter-spacing:-.02em;line-height:1.35}
.teaser-opts{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.teaser-opts span{display:grid;place-items:center;min-height:42px;border-radius:12px;border:1.5px solid var(--line);font-size:14px;font-weight:600;color:var(--muted)}
.teaser-opts .pick{border-color:var(--signal);color:var(--signal-ink);background:color-mix(in srgb,var(--signal) 9%,transparent)}

/* analytics unit chart */
#units{width:100%;height:auto;margin-top:10px;overflow:visible;display:block}
.u-dot{fill:var(--signal-cool);transition:transform 1s cubic-bezier(.65,0,.35,1),fill .6s,opacity .6s}
.demo-chart[data-view="signal"] .u-dot{fill:var(--signal);opacity:var(--op)}
.u-lbl,.u-cnt{font:500 9px var(--mono);letter-spacing:.06em;text-transform:uppercase;fill:var(--muted);text-anchor:middle;opacity:0;transition:opacity .5s .9s}
.u-cnt{font-size:10px;font-weight:700;fill:var(--ink)}
.demo-chart[data-view="signal"] .u-lbl,.demo-chart[data-view="signal"] .u-cnt{opacity:1}

/* process illustrations */
.step-art{display:block;width:100%;max-width:300px;height:auto;margin-top:16px;overflow:hidden}
.step-art *{transform-box:view-box}
.a-ring{fill:none;stroke:var(--signal);stroke-width:1.4;opacity:0;transform-origin:120px 44px}
.a-in{fill:var(--signal);opacity:0}
.a-core{fill:var(--signal)}
.a-core-in{fill:var(--surface)}
li.on .a-ring{animation:a-ripple 2.4s cubic-bezier(.2,.6,.3,1) infinite;animation-delay:var(--d)}
li.on .a-in{animation:a-incoming 2.6s cubic-bezier(.5,0,.8,.6) infinite;animation-delay:var(--d)}
@keyframes a-ripple{0%{transform:scale(1);opacity:.85}100%{transform:scale(6);opacity:0}}
@keyframes a-incoming{0%{transform:translate(var(--x),var(--y));opacity:0}20%{opacity:.9}88%{opacity:.9}100%{transform:translate(0,0);opacity:0}}
.a-nz{fill:var(--signal-cool);opacity:.8;transition:transform .9s cubic-bezier(.65,0,.35,1) var(--d),opacity .4s calc(var(--d) + .6s)}
li.on .a-nz{transform:translate(var(--x),var(--y));opacity:0}
.a-doc{fill:var(--bg);stroke:var(--line);stroke-width:1.5}
.a-line{stroke:var(--muted);stroke-width:3.5;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset .6s cubic-bezier(.2,.8,.2,1) var(--d)}
.a-tick{fill:none;stroke:var(--signal);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset .4s var(--d)}
li.on .a-line,li.on .a-tick{stroke-dashoffset:0}
.a-stamp{opacity:0;transform:scale(.5) rotate(-30deg);transform-origin:196px 46px;transition:opacity .4s 1.6s,transform .6s cubic-bezier(.3,1.6,.5,1) 1.6s}
.a-stamp circle{fill:color-mix(in srgb,var(--signal) 12%,transparent);stroke:var(--signal);stroke-width:2}
.a-stamp path{fill:none;stroke:var(--signal);stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
li.on .a-stamp{opacity:1;transform:scale(1) rotate(-8deg)}
.a-cube{opacity:0;transform:translateY(-34px);transition:opacity .35s var(--d),transform .7s cubic-bezier(.3,1.5,.5,1) var(--d)}
li.on .a-cube{opacity:1;transform:none}
.a-cube path{stroke:var(--surface);stroke-width:.8;stroke-linejoin:round}
.f-t{fill:var(--signal)}
.f-l{fill:color-mix(in srgb,var(--signal) 58%,var(--ink))}
.f-r{fill:color-mix(in srgb,var(--signal) 72%,var(--bg))}
.a-arc-bg,.a-arc{fill:none;stroke-width:9;stroke-linecap:round}
.a-arc-bg{stroke:var(--soft)}
.a-arc{stroke:var(--signal);stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 1.3s cubic-bezier(.2,.8,.2,1) .2s}
li.on .a-arc{stroke-dashoffset:.12}
.a-tk{stroke:var(--line);stroke-width:1.5}
.a-needle{stroke:var(--ink);stroke-width:2.6;stroke-linecap:round;transform-origin:92px 78px;transform:rotate(-90deg);transition:transform 1.5s cubic-bezier(.3,1.35,.5,1) .2s}
li.on .a-needle{transform:rotate(68deg)}
.a-hub{fill:var(--ink)}
.a-key{opacity:0;transform:translateX(36px);transition:opacity .5s 1.3s,transform .8s cubic-bezier(.2,.8,.2,1) 1.3s}
.a-key circle,.a-key path{fill:none;stroke:var(--signal);stroke-width:3;stroke-linecap:round}
.a-key .k-hole{stroke-width:2}
li.on .a-key{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  li.on .a-ring,li.on .a-in{animation:none}
  .a-ring{opacity:.25}
}

/* forms (Klaviyo) */
.tx-form{position:relative;display:grid;gap:16px;padding:clamp(20px,3vw,30px);border-radius:26px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}
.tx-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-bottom:14px;border-bottom:1px dashed var(--line)}
.tx-status{display:flex;align-items:center;gap:8px;color:var(--muted)}
.tx-status i{width:8px;height:8px;border-radius:50%;background:var(--signal-cool);transition:background .3s}
.tx-form[data-state="idle"] .tx-status i{background:var(--signal)}
.tx-form[data-state="sending"] .tx-status i{background:var(--signal);animation:pulse 1s infinite}
.tx-form[data-state="sent"] .tx-status i{background:#2f9e5b}
.tx-form[data-state="error"] .tx-status{color:var(--signal-ink)}
.tx-title{font-size:clamp(24px,2.6vw,32px);letter-spacing:-.035em}
.tx-sub{color:var(--muted);font-size:15.5px;margin-top:-6px}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.f-field{display:grid;gap:7px}
.f-label{font-size:13.5px;font-weight:600;color:var(--ink);padding:0}
.f-label span{font-weight:450;color:var(--muted);margin-left:4px}
.f-field input,.f-field textarea{width:100%;min-height:50px;padding:12px 15px;border-radius:14px;border:1.5px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-size:16px;transition:border-color .2s,box-shadow .2s;resize:vertical}
.f-field textarea{min-height:84px}
.f-field input::placeholder,.f-field textarea::placeholder{color:color-mix(in srgb,var(--muted) 70%,transparent)}
.f-field input:focus,.f-field textarea:focus{outline:none;border-color:var(--signal);box-shadow:0 0 0 4px color-mix(in srgb,var(--signal) 16%,transparent)}
.f-field.invalid input{border-color:var(--signal-ink);box-shadow:0 0 0 4px color-mix(in srgb,var(--signal) 14%,transparent)}
.f-chips{border:0;margin:0;padding:0;display:grid;gap:10px}
.f-chips legend{margin-bottom:10px}
.f-chips .chip-row label{position:relative;display:inline-flex;align-items:center;min-height:42px;padding:8px 16px;border-radius:999px;border:1.5px solid var(--line);font-size:14px;font-weight:580;cursor:pointer;transition:all .2s}
.f-chips .chip-row input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.f-chips .chip-row label:has(input:checked){background:var(--ink);color:var(--bg);border-color:var(--ink)}
.f-chips .chip-row label:has(input:focus-visible){outline:2.5px solid var(--signal);outline-offset:2px}
.f-check{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted);cursor:pointer}
.f-check input{width:20px;height:20px;margin:1px 0 0;accent-color:var(--signal);flex:none}
.f-error{font-size:14px;font-weight:600;color:var(--signal-ink);min-height:0}
.f-error:empty{display:none}
.f-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px}
.f-alt{font-size:14px;color:var(--muted)}
.f-alt a{color:var(--ink);font-weight:600;text-decoration:underline;text-decoration-color:var(--signal);text-underline-offset:4px}
.f-alt .link-btn{font-size:13px;min-height:auto}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.f-success{display:grid;gap:8px;padding:20px;border-radius:18px;background:color-mix(in srgb,var(--signal) 8%,var(--surface));border:1px solid color-mix(in srgb,var(--signal) 35%,var(--line))}
.f-success .mono-label{color:var(--signal-ink)}
.f-success-title{font-size:22px;font-weight:650;letter-spacing:-.03em}
.f-success p:last-child{color:var(--muted)}
.tx-form.sent > :not(.tx-head):not(.f-success){display:none}

/* homepage contact layout */
.contact-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(28px,5vw,72px);align-items:start}
.contact-copy{display:grid;gap:20px;padding-top:12px}
.contact-copy h2{font-size:clamp(40px,5.4vw,78px)}
.contact-facts{display:grid;gap:10px;font-weight:560}
.contact-facts li{display:flex;gap:12px;align-items:baseline}
.contact-facts li::before{content:"";flex:none;width:14px;height:2px;background:var(--signal);transform:translateY(-4px)}

/* ===== signal check page ===== */
.check-page{padding-block:clamp(28px,5vw,64px) clamp(60px,8vw,110px)}
.check-intro{display:grid;gap:16px;margin-bottom:clamp(24px,4vw,40px)}
.check-intro h1{font-size:clamp(40px,6.4vw,92px);line-height:.96;letter-spacing:-.05em;font-weight:660;text-wrap:balance;max-width:14ch}
.check-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:clamp(20px,4vw,56px);align-items:start}
.stage{display:grid;gap:18px;min-width:0;scroll-margin-top:96px}
.phase{display:grid;gap:16px}
.stage-top{display:flex;justify-content:space-between;align-items:center;gap:12px}
.ticks6{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}
.ticks6 i{height:6px;border-radius:6px;background:var(--line);transition:background .4s}
.ticks6 i.done{background:var(--signal)}
.ticks6 i.now{background:color-mix(in srgb,var(--signal) 40%,var(--line));animation:tickpulse 1.6s ease-in-out infinite}
@keyframes tickpulse{50%{background:color-mix(in srgb,var(--signal) 70%,var(--line))}}
.q-card,.result-card{display:grid;gap:18px;padding:clamp(22px,3.4vw,36px);border-radius:28px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}
#q-card{view-transition-name:qcard}
.q-chip{justify-self:start;font:600 11px var(--mono);letter-spacing:.09em;text-transform:uppercase;padding:6px 10px;border-radius:8px;color:var(--signal-ink);background:color-mix(in srgb,var(--signal) 11%,transparent)}
.q-big{font-size:clamp(26px,3.4vw,40px);line-height:1.12;letter-spacing:-.035em;font-weight:640;outline:none}
.q-hint{color:var(--muted);font-size:15px;margin-top:-6px}
.q-opts{display:grid;gap:10px}
.q-opt{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:16px;width:100%;min-height:72px;padding:14px 18px;border-radius:18px;border:1.5px solid var(--line);background:var(--bg);text-align:left;cursor:pointer;transition:border-color .2s,background .2s,transform .2s,box-shadow .2s}
@media (hover:hover){.q-opt:hover{border-color:var(--ink);transform:translateY(-1px)}}
.q-opt:active{transform:scale(.99)}
.q-ico{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--surface);border:1px solid var(--line);color:var(--muted);transition:all .25s}
.q-txt{display:grid;gap:2px}
.q-txt b{font-size:17px;font-weight:650;letter-spacing:-.01em}
.q-txt small{font-size:14px;color:var(--muted)}
.q-key{font:500 11px var(--mono);color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:3px 7px}
.q-opt[aria-checked="true"]{border-color:var(--signal);background:color-mix(in srgb,var(--signal) 8%,var(--surface));box-shadow:0 0 0 4px color-mix(in srgb,var(--signal) 14%,transparent)}
.q-opt[aria-checked="true"] .q-ico{background:var(--signal);border-color:var(--signal);color:var(--on-signal)}
.q-opt.picked .q-ico{animation:popin .35s cubic-bezier(.3,1.6,.5,1)}
@keyframes popin{from{transform:scale(.6)}}
.chips.chips-lg .chip-row label{min-height:48px;padding:10px 18px;font-size:15px}
.chips.chips-lg .chip-row{gap:8px}
.chips.chips-lg legend{margin-bottom:12px}
#see-results{justify-self:start;margin-top:6px}
.r-title{font-size:clamp(28px,3.6vw,44px);line-height:1.08;letter-spacing:-.04em;outline:none}
.r-title span{color:var(--signal-ink)}
.r-sum{color:var(--muted);font-size:17px}
.result-card .ticks{margin-top:0}
.brief-peek summary{cursor:pointer;font-weight:600;min-height:44px;display:flex;align-items:center}
.brief-peek .brief-text{margin:6px 0 10px}
.peek-actions{display:flex;gap:16px}
.retake{text-align:center}
.check-page .meter-panel{top:92px}
.meter-note{margin-top:-6px}
::view-transition-old(qcard){animation:qout .25s ease both}
::view-transition-new(qcard){animation:qin .4s cubic-bezier(.2,.8,.2,1) both}
@keyframes qout{to{opacity:0;transform:translateX(-30px)}}
@keyframes qin{from{opacity:0;transform:translateX(40px)}}

@media (max-width:860px){
  .teaser,.contact-grid,.check-layout{grid-template-columns:1fr}
  .stage{scroll-margin-top:150px}
  .check-layout .meter-panel{order:-1;position:sticky;top:calc(env(safe-area-inset-top,0px) + 76px);z-index:5}
  .check-layout .meter-card{padding:12px 16px;gap:8px;border-radius:18px;background:var(--glass);backdrop-filter:blur(16px) saturate(1.4);-webkit-backdrop-filter:blur(16px) saturate(1.4)}
  .check-layout .meter-card .meter-top,.check-layout .meter-note{display:none}
  .check-layout .meters{grid-template-columns:repeat(3,1fr);gap:10px}
  .check-layout .meter{grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto auto;gap:5px 6px;align-content:end}
  .check-layout .meter-name{grid-column:1 / -1;font-size:12px;line-height:1.15;white-space:normal;overflow:visible;text-wrap:balance}
  .check-layout .meter-val{grid-column:2;grid-row:2;font-size:11px;min-width:0;align-self:center}
  .check-layout .leds{grid-column:1;grid-row:2;grid-template-columns:repeat(10,1fr);gap:2px}
  .check-layout .leds i{height:8px;border-radius:2px}
  .check-layout .leds i:nth-child(even){display:none}
  .check-layout .meter.weak .meter-name::after{display:none}
  .check-layout .meter.weak .meter-name{color:var(--signal-ink)}
  .check-page .dock{display:none}
}
@media (max-width:680px){
  .f-row{grid-template-columns:1fr}
  .q-opt{min-height:68px;padding:12px 14px;gap:12px}
  .q-key{display:none}
  .how-steps{font-size:13.5px;gap:8px 14px}
  .check-page + .site-footer{padding-bottom:calc(32px + env(safe-area-inset-bottom,0px))}
}

/* model sliders */
.model-hint{margin-bottom:-4px}
.sfield{display:grid;gap:8px}
.sfield-top{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.sfield-top label{font-size:15px;font-weight:580;color:var(--muted)}
.sfield-top output{font:650 24px var(--mono);font-variant-numeric:tabular-nums;letter-spacing:-.02em;color:var(--ink);white-space:nowrap}
#m-target-out{color:var(--signal-ink)}
.sfield input[type=range]{width:100%;height:40px;touch-action:pan-y}
.sfield input[type=range]::-webkit-slider-runnable-track{height:6px;border-radius:6px}
.sfield input[type=range]::-webkit-slider-thumb{width:28px;height:28px;margin-top:-11px;border-width:3px}
.sfield input[type=range]::-moz-range-thumb{width:24px;height:24px;border-width:3px}
.sfield input[type=range]::-moz-range-track,.sfield input[type=range]::-moz-range-progress{height:6px}
.sfield-scale{display:flex;justify-content:space-between;gap:8px;margin-top:-6px;font:500 11px var(--mono);color:var(--muted)}
.sfield-scale .delta{font-weight:650;color:var(--signal-ink)}
.sfield-scale .delta.neg{color:var(--muted)}
.inline-link{color:var(--ink);font-weight:600;text-decoration:underline;text-decoration-color:var(--signal);text-underline-offset:3px}