/* ============================================================
   StoZ — dark RF instrument page
   ============================================================ */
:root{
  --bg:#05070b;
  --bg-2:#070b11;
  --panel:#0a0f17;
  --panel-2:#0d141e;
  --line:#182130;
  --line-2:#121a26;
  --ink:#e6edf8;
  --ink-2:#b9c5d6;
  --muted:#8b98ad;
  --faint:#5f6c80;
  --teal:#3ddbc9;
  --teal-dim:rgba(61,219,201,.14);
  --amber:#ffb454;
  --blue:#7c9cff;
  --sans:"Inter","HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular",ui-monospace,"Cascadia Code",Consolas,"Courier New",monospace;
  --wrap:1160px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:15px;line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    linear-gradient(rgba(120,160,200,.045) 1px,transparent 1px) 0 0/48px 48px,
    linear-gradient(90deg,rgba(120,160,200,.045) 1px,transparent 1px) 0 0/48px 48px,
    radial-gradient(900px 520px at 78% -10%,rgba(61,219,201,.10),transparent 68%),
    radial-gradient(700px 500px at 8% 6%,rgba(124,156,255,.07),transparent 70%);
  mask-image:linear-gradient(180deg,#000 0%,#000 62%,transparent 92%);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,#000 62%,transparent 92%);
}
::selection{background:rgba(61,219,201,.28);color:#fff}
a{color:inherit;text-decoration:none}
code{font-family:var(--mono);font-size:.88em;color:#b9d2e8}
h1,h2,h3{letter-spacing:-.035em;line-height:1.12;margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(18px,4vw,32px)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;z-index:99;background:#0a0f17;padding:10px 14px;border:1px solid var(--teal);border-radius:8px}

/* ---------------- nav ---------------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(5,7,11,.66);
  backdrop-filter:blur(14px) saturate(1.3);
  -webkit-backdrop-filter:blur(14px) saturate(1.3);
  border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s;
}
.nav.is-stuck{border-bottom-color:var(--line);background:rgba(5,7,11,.88)}
.nav-in{max-width:var(--wrap);margin:0 auto;height:62px;padding:0 clamp(18px,4vw,32px);display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:9px}
.brand-glyph{display:block;width:30px;height:30px;object-fit:contain;flex:0 0 auto}
.brand-word{font-family:var(--mono);font-size:17px;font-weight:700;letter-spacing:-.02em}
.brand-sub{font-family:var(--mono);font-size:9.5px;color:var(--teal);border:1px solid rgba(61,219,201,.28);background:rgba(61,219,201,.07);border-radius:4px;padding:1px 5px;letter-spacing:.06em}
.nav-links{display:flex;gap:24px;margin-left:auto;font-size:13px;color:var(--muted)}
.nav-links a{position:relative;padding:5px 0;transition:color .2s}
.nav-links a:hover,.nav-links a.is-active{color:var(--ink)}
.nav-links a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--teal);transform:scaleX(0);transform-origin:left;transition:transform .25s}
.nav-links a:hover::after,.nav-links a.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:14px}
.nav-ver{font-family:var(--mono);font-size:10.5px;color:var(--faint);border:1px solid var(--line);border-radius:999px;padding:2px 8px}
.nav-gh{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;color:var(--ink-2);border:1px solid var(--line);border-radius:8px;padding:6px 11px;background:rgba(255,255,255,.02);transition:border-color .2s,color .2s,background .2s}
.nav-gh:hover{border-color:#2c3a4f;color:#fff;background:rgba(255,255,255,.05)}

/* ---------------- hero ---------------- */
.hero{position:relative;padding:clamp(104px,13vw,150px) 0 clamp(48px,6vw,72px);overflow:hidden}
.hero-bg{position:absolute;inset:0;pointer-events:none;display:flex;justify-content:flex-end;align-items:flex-start}
.hero-bg span{
  font-family:var(--mono);font-weight:700;letter-spacing:-.06em;line-height:.8;
  font-size:clamp(160px,26vw,380px);
  color:transparent;-webkit-text-stroke:1px rgba(140,175,210,.10);
  transform:translate(4%,-14%);user-select:none;
}
.hero-grid{position:relative;z-index:1;max-width:var(--wrap);margin:0 auto;padding:0 clamp(18px,4vw,32px);display:grid;grid-template-columns:1.04fr .96fr;gap:clamp(32px,5vw,64px);align-items:center}
.tap{margin:0 0 20px;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--teal)}
.tap::before{content:"";display:inline-block;width:18px;height:1px;background:var(--teal);vertical-align:middle;margin-right:9px;opacity:.7}
.hero h1{font-size:clamp(38px,5.6vw,68px);font-weight:720;letter-spacing:-.05em;line-height:1.06}
.grad{
  background:linear-gradient(100deg,#3ddbc9 0%,#7c9cff 70%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.eq{
  display:inline-flex;align-items:center;gap:12px;margin:26px 0 0;
  padding:12px 20px;border:1px solid rgba(61,219,201,.2);border-radius:11px;
  background:linear-gradient(180deg,rgba(61,219,201,.06),rgba(61,219,201,.015));
  font-family:var(--mono);font-size:19px;color:#dfeaf4;
  box-shadow:0 0 0 1px rgba(61,219,201,.03) inset,0 18px 40px -34px rgba(61,219,201,.7);
}
.eq-z{color:var(--teal);font-weight:600}
.eq-op{color:var(--faint)}
.eq-frac{display:inline-flex;flex-direction:column;align-items:center;font-size:15px;line-height:1.28;vertical-align:middle}
.eq-up{padding:0 4px;white-space:nowrap}
.eq-line{display:block;width:100%;height:1px;background:rgba(223,234,244,.45);margin:3px 0}
.eq-dn{padding:0 4px}
.lead{margin:24px 0 0;max-width:34em;font-size:15.5px;line-height:1.85;color:var(--ink-2)}
.cta-row{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border-radius:10px;font-size:14px;font-weight:560;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .25s,background .2s,border-color .2s,color .2s}
.btn:active{transform:translateY(1px)}
.btn-solid{background:linear-gradient(180deg,#47e4d1,#2fc7b6);color:#03211d;box-shadow:0 12px 28px -16px rgba(61,219,201,.9),0 1px 0 rgba(255,255,255,.35) inset}
.btn-solid:hover{box-shadow:0 16px 34px -16px rgba(61,219,201,1),0 1px 0 rgba(255,255,255,.4) inset}
.btn-wire{border-color:#263345;color:var(--ink-2);background:rgba(255,255,255,.02)}
.btn-wire:hover{border-color:#3a4a61;color:#fff;background:rgba(255,255,255,.05)}
.hero-spec{display:grid;grid-template-columns:repeat(4,auto);gap:0 34px;margin:36px 0 0;padding:18px 0 0;border-top:1px solid var(--line)}
.hero-spec div{display:flex;flex-direction:column;gap:2px}
.hero-spec dt{font-size:10.5px;color:var(--faint);letter-spacing:.05em;order:2}
.hero-spec dd{margin:0;font-family:var(--mono);font-size:13px;color:var(--ink-2);order:1}

/* instrument */
.hero-instrument{position:relative}
.scope{
  border:1px solid var(--line);border-radius:16px;overflow:hidden;
  background:
    radial-gradient(120% 90% at 50% 0%,rgba(61,219,201,.07),transparent 60%),
    linear-gradient(180deg,#0b1119,#080d14);
  box-shadow:0 1px 0 rgba(255,255,255,.04) inset,0 40px 80px -60px rgba(61,219,201,.55);
}
.scope-head{display:flex;align-items:center;justify-content:space-between;padding:11px 15px;border-bottom:1px solid var(--line-2)}
.scope-title{font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--teal);opacity:.9}
.scope-meta{font-family:var(--mono);font-size:9.5px;color:var(--faint)}
.scope-canvas{padding:14px 14px 6px}
.scope-canvas canvas{display:block;width:100%;height:auto;aspect-ratio:1/1}
.scope-foot{display:flex;align-items:center;gap:8px;padding:10px 15px;border-top:1px solid var(--line-2);font-family:var(--mono);font-size:10.5px;color:var(--muted)}
.scope-z{margin-left:auto;color:var(--amber)}
.led{width:5px;height:5px;border-radius:50%;background:var(--teal);box-shadow:0 0 8px rgba(61,219,201,.9);animation:led 2.6s ease-in-out infinite}
@keyframes led{50%{opacity:.35}}
.hero-caption{display:flex;justify-content:space-between;gap:12px;margin-top:12px;padding:0 4px;font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.02em}

/* ---------------- section head ---------------- */
.sec-head{max-width:var(--wrap);margin:0 auto}
.sec-kicker{margin:0 0 14px;font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--teal);opacity:.85}
.sec-head h2{font-size:clamp(28px,3.6vw,42px);font-weight:680;letter-spacing:-.045em}
.sec-sub{margin:16px 0 0;max-width:46em;font-size:14.5px;color:var(--muted)}

/* ---------------- calc ---------------- */
.calc{padding:clamp(64px,8vw,108px) 0 0}
.calc-panel{
  margin-top:36px;display:grid;grid-template-columns:340px 1fr;
  border:1px solid var(--line);border-radius:18px;overflow:hidden;
  background:linear-gradient(180deg,#080d14,#060a10);
}
.controls{padding:26px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:18px;background:rgba(255,255,255,.012)}
.ctrl-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding-bottom:16px;border-bottom:1px solid var(--line-2)}
.ctrl-row label{font-size:13px;color:var(--ink-2)}
.num-wrap{display:flex;align-items:center;gap:6px}
.num-wrap input{
  width:78px;height:34px;border-radius:8px;border:1px solid #243144;background:#080d14;
  color:var(--teal);font-family:var(--mono);font-size:13px;text-align:right;padding:0 9px;
  outline:none;transition:border-color .2s,box-shadow .2s;
}
.num-wrap input:focus{border-color:rgba(61,219,201,.55);box-shadow:0 0 0 3px rgba(61,219,201,.12)}
.num-wrap span{font-family:var(--mono);font-size:11.5px;color:var(--faint)}
.ctrl label{display:flex;align-items:baseline;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--muted);margin-bottom:9px}
.ctrl output{font-family:var(--mono);font-size:12px;color:var(--teal)}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:3px;border-radius:2px;
  background:linear-gradient(90deg,rgba(61,219,201,.5),rgba(124,156,255,.35));
  outline:none;cursor:pointer;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:#0a0f17;border:2px solid var(--teal);box-shadow:0 0 0 4px rgba(61,219,201,.12);
  transition:box-shadow .2s,transform .2s;
}
input[type=range]::-webkit-slider-thumb:hover{box-shadow:0 0 0 6px rgba(61,219,201,.18);transform:scale(1.08)}
input[type=range]::-moz-range-thumb{width:12px;height:12px;border-radius:50%;background:#0a0f17;border:2px solid var(--teal)}
.presets{display:flex;flex-wrap:wrap;gap:6px}
.presets button{
  appearance:none;cursor:pointer;font-family:var(--mono);font-size:10.5px;
  padding:5px 9px;border-radius:6px;border:1px solid #223046;
  background:rgba(255,255,255,.02);color:var(--muted);
  transition:border-color .2s,color .2s,background .2s;
}
.presets button:hover{border-color:rgba(61,219,201,.45);color:var(--teal);background:rgba(61,219,201,.06)}
.ctrl-note{margin:auto 0 0;font-size:11px;line-height:1.65;color:var(--faint)}

.readout{padding:24px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.92fr);gap:24px;align-items:stretch}
.chart-box{border:1px solid var(--line-2);border-radius:12px;background:#070c12;overflow:hidden}
.chart-head{display:flex;justify-content:space-between;padding:9px 12px;border-bottom:1px solid var(--line-2);font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:var(--faint)}
.chart-tag{color:var(--teal)}
.chart-box canvas{display:block;width:100%;height:auto;aspect-ratio:1/1}
.numbers{display:flex;flex-direction:column;gap:16px;min-width:0}
.num-primary{display:flex;flex-direction:column;gap:4px;padding-bottom:14px;border-bottom:1px solid var(--line-2)}
.num-label{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--faint)}
.num-value{font-family:var(--mono);font-size:clamp(20px,2.3vw,26px);color:var(--teal);letter-spacing:-.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.num-value i{font-style:normal;font-size:.55em;color:var(--faint);margin-left:4px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line-2);border:1px solid var(--line-2);border-radius:9px;overflow:hidden}
.grid-2 .cell{background:#080d14;padding:10px 12px;display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.cell span{font-size:11px;color:var(--faint)}
.cell b{font-family:var(--mono);font-size:12.5px;font-weight:500;color:var(--ink-2)}
.equiv{border:1px solid var(--line-2);border-radius:9px;padding:12px 14px;background:rgba(61,219,201,.03)}
.equiv-head{font-family:var(--mono);font-size:9.5px;letter-spacing:.08em;color:var(--faint);margin-bottom:7px}
.equiv-body{font-family:var(--mono);font-size:12.5px;color:var(--ink-2);line-height:1.6}
.equiv-body em{font-style:normal;color:var(--amber)}
.equiv-sub{margin-top:6px;font-size:11px;color:var(--faint);line-height:1.5}
.fineprint{margin:auto 0 0;font-size:10.5px;line-height:1.7;color:var(--faint);border-top:1px dashed var(--line-2);padding-top:12px}
.fcard .lang-chips{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}
.chip{font-family:var(--mono);font-size:10px;color:var(--muted);border:1px solid var(--line);border-radius:5px;padding:2px 8px}

/* ---------------- features ---------------- */
.features{padding:clamp(72px,9vw,120px) 0 0}
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:14px;margin-top:36px}
.fcard{
  grid-column:span 3;position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:14px;padding:22px 20px;
  background:linear-gradient(180deg,#0a0f17,#080c13);
  transition:border-color .3s,transform .35s cubic-bezier(.2,.7,.2,1),box-shadow .35s;
}
.fcard::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .35s;
  background:radial-gradient(320px 140px at 80% 0%,rgba(61,219,201,.09),transparent 70%);
}
.fcard:hover{border-color:#26344a;transform:translateY(-3px);box-shadow:0 30px 60px -50px rgba(61,219,201,.8)}
.fcard:hover::after{opacity:1}
.fcard--wide{grid-column:span 6}
.idx{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--amber);opacity:.75;margin-bottom:12px}
.fcard h3{font-size:16.5px;font-weight:620;letter-spacing:-.02em;margin-bottom:9px}
.fcard p{margin:0;font-size:13px;line-height:1.75;color:var(--muted)}
.fcard code{color:#9fc4dd;background:rgba(124,156,255,.07);border-radius:4px;padding:1px 4px}
.chips{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:14px 0 0}
.chips li{font-family:var(--mono);font-size:10px;color:var(--teal);border:1px solid rgba(61,219,201,.22);background:rgba(61,219,201,.05);border-radius:5px;padding:2px 7px}
.viz-note{display:flex;gap:8px;margin-top:14px}
.viz-note span{font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:var(--faint);border:1px solid var(--line);border-radius:5px;padding:2px 8px}
.logline{
  margin-top:14px;padding:10px 12px;border-radius:8px;background:#060a10;border:1px solid var(--line-2);
  font-family:var(--mono);font-size:10px;line-height:1.9;color:#6f7f96;overflow-x:auto;
}
.logline b{color:var(--teal);font-weight:400}
.logline i{font-style:normal;color:var(--amber)}

/* ---------------- math ---------------- */
.math{padding:clamp(72px,9vw,120px) 0 0}
.math-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:36px}
.eq-card{border:1px solid var(--line);border-radius:14px;padding:24px;background:linear-gradient(180deg,#090e15,#070b11)}
.eq-tag{display:inline-block;font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--teal);border:1px solid rgba(61,219,201,.22);border-radius:4px;padding:2px 7px;margin-bottom:16px}
.big-eq{font-family:var(--mono);font-size:clamp(16px,1.9vw,20px);color:#d8e8f4;line-height:1.6;letter-spacing:-.01em}
.big-eq sub{font-size:.62em;color:var(--muted)}
.frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 2px;font-size:.78em;line-height:1.3}
.frac-top{padding:0 6px 2px;border-bottom:1px solid rgba(216,232,244,.4)}
.frac-bot{padding:2px 6px 0}
.eq-card p{margin:14px 0 0;font-size:13px;color:var(--muted);line-height:1.75}
.eq-list{display:grid;gap:8px}
.eq-list > div{display:flex;align-items:baseline;gap:12px;padding-bottom:8px;border-bottom:1px dashed var(--line-2)}
.eq-list > div:last-child{border-bottom:0;padding-bottom:0}
.eq-list span{flex:0 0 74px;font-size:11.5px;color:var(--faint)}
.eq-list code{font-size:11.5px;color:#b6cbdc;line-height:1.7}

/* ---------------- io ---------------- */
.io{padding:clamp(72px,9vw,120px) 0 0}
.io-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:14px;margin-top:36px}
.table-card,.code-card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#080d14}
.table-head{display:flex;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line-2);font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--faint)}
table{width:100%;border-collapse:collapse;font-size:12.5px}
th{text-align:left;padding:10px 16px;font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:var(--faint);font-weight:400;border-bottom:1px solid var(--line-2)}
td{padding:12px 16px;border-bottom:1px solid var(--line-2);color:var(--muted);vertical-align:top;line-height:1.6}
tr:last-child td{border-bottom:0}
td:first-child{color:var(--ink-2)}
td code{font-size:10.5px;color:#9fc4dd}
.table-note{margin:0;padding:14px 16px;font-size:11px;color:var(--faint);line-height:1.7;border-top:1px solid var(--line-2)}
.code-head{display:flex;justify-content:space-between;align-items:center;padding:11px 14px;border-bottom:1px solid var(--line-2);font-family:var(--mono);font-size:9.5px;color:var(--faint)}
.dotrow{display:flex;gap:4px}
.dotrow i{width:6px;height:6px;border-radius:50%;background:#1c2736}
.code-card pre{margin:0;padding:18px 16px;overflow-x:auto;font-size:11.5px;line-height:1.9;color:#9fb4c8}
.code-card code{background:none;padding:0;font-size:inherit;color:inherit}
.code-card .k{color:var(--teal)}
.code-card .c{color:#5f7389}
.code-card .n{color:var(--amber)}
.code-note{margin:0;padding:0 16px 16px;font-size:11px;line-height:1.7;color:var(--faint)}

/* ---------------- get ---------------- */
.get{padding:clamp(72px,9vw,120px) 0 0}
.get-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:14px;margin-top:36px;align-items:start}
.get-steps{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.get-steps li{display:flex;gap:16px;padding:18px 20px;border:1px solid var(--line);border-radius:12px;background:#080d14}
.step-n{flex:0 0 auto;width:26px;height:26px;border-radius:7px;display:grid;place-items:center;font-family:var(--mono);font-size:11px;color:var(--teal);border:1px solid rgba(61,219,201,.25);background:rgba(61,219,201,.06)}
.get-steps h3{font-size:14.5px;margin-bottom:6px;font-weight:600}
.get-steps p{margin:0;font-size:12.5px;line-height:1.7;color:var(--muted)}
.inline-code{margin:12px 0 0;padding:10px 12px;background:#050910;border:1px solid var(--line-2);border-radius:7px;font-size:11px;line-height:1.8;color:#9fb4c8;overflow-x:auto}
.inline-code code{background:none;padding:0;color:inherit;font-size:inherit}
.inline-code .p{color:var(--teal)}
.get-card{border:1px solid var(--line);border-radius:14px;padding:22px;background:linear-gradient(180deg,#0a0f17,#070b11)}
.get-card-kicker{margin:0 0 12px;font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;color:var(--faint);text-transform:uppercase}
.repo-link{display:flex;align-items:center;gap:9px;padding:11px 13px;border:1px solid #223046;border-radius:9px;background:rgba(255,255,255,.02);font-family:var(--mono);font-size:11.5px;color:var(--ink-2);transition:border-color .2s,background .2s,color .2s}
.repo-link:hover{border-color:rgba(61,219,201,.4);color:#fff;background:rgba(61,219,201,.05)}
.repo-arrow{margin-left:auto;color:var(--faint)}
.get-spec{display:grid;grid-template-columns:1fr 1fr;gap:10px 16px;margin:18px 0 0}
.get-spec div{display:flex;justify-content:space-between;gap:8px;padding-bottom:9px;border-bottom:1px dashed var(--line-2)}
.get-spec dt{font-size:11px;color:var(--faint)}
.get-spec dd{margin:0;font-family:var(--mono);font-size:11px;color:var(--ink-2)}
.warn{display:flex;gap:10px;margin-top:18px;padding:12px 13px;border:1px solid rgba(255,180,84,.2);background:rgba(255,180,84,.05);border-radius:9px}
.warn > span{flex:0 0 auto;font-family:var(--mono);font-size:9px;letter-spacing:.08em;color:var(--amber);border:1px solid rgba(255,180,84,.3);border-radius:4px;padding:1px 5px;height:17px;line-height:15px}
.warn p{margin:0;font-size:11px;line-height:1.7;color:#bfa986}

/* ---------------- limits ---------------- */
.limits{padding:clamp(72px,9vw,110px) 0 0}
.limits-box{border:1px solid var(--line);border-radius:14px;padding:26px;background:linear-gradient(90deg,rgba(124,156,255,.05),transparent 40%)}
.limits-box h2{font-size:15px;letter-spacing:-.01em;margin-bottom:14px;color:var(--ink-2)}
.limits-box ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px 32px}
.limits-box li{position:relative;padding-left:16px;font-size:12.5px;line-height:1.7;color:var(--muted)}
.limits-box li::before{content:"—";position:absolute;left:0;color:var(--faint)}
.limits-box code{font-size:10.5px}

/* ---------------- footer ---------------- */
.foot{margin-top:clamp(64px,8vw,100px);border-top:1px solid var(--line);padding-top:34px}
.foot-in{display:flex;justify-content:space-between;gap:28px;flex-wrap:wrap;align-items:flex-start}
.foot-word{font-family:var(--mono);font-size:15px;font-weight:700}
.foot-brand p{margin:6px 0 0;font-size:12px;color:var(--faint)}
.foot-nav{display:flex;gap:22px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.foot-nav a:hover{color:var(--teal)}
.foot-copy{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:26px 0 34px;margin-top:22px;border-top:1px solid var(--line-2);font-size:10.5px;color:#5d6b80;font-family:var(--mono)}

/* ---------------- reveal ---------------- */
.rv{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.rv.is-in{opacity:1;transform:none}

/* ---------------- responsive ---------------- */
@media (max-width:1080px){
  .readout{grid-template-columns:1fr}
  .chart-box{max-width:440px}
  .fcard{grid-column:span 6}
  .fcard--wide{grid-column:span 6}
  .io-grid,.get-grid{grid-template-columns:1fr}
}
@media (max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-copy{max-width:620px}
  .nav-links{display:none}
  .calc-panel{grid-template-columns:1fr}
  .controls{border-right:0;border-bottom:1px solid var(--line)}
  .math-grid{grid-template-columns:1fr}
  .hero-spec{grid-template-columns:repeat(2,auto);gap:14px 32px}
  .limits-box ul{grid-template-columns:1fr}
}
@media (max-width:640px){
  body{font-size:14.5px}
  .hero{padding-top:92px}
  .hero h1{letter-spacing:-.04em}
  .hero-bg span{font-size:160px;opacity:.7}
  .eq{font-size:16px;padding:10px 14px}
  .btn{flex:1 1 auto}
  .cta-row .btn{justify-content:center}
  .grid{grid-template-columns:1fr}
  .fcard,.fcard--wide{grid-column:span 1}
  .readout{padding:16px}
  .controls{padding:20px}
  .table-card{overflow-x:auto}
  table{min-width:520px}
  .nav-ver{display:none}
  .nav-gh span{display:none}
  .nav-gh{padding:7px 9px}
  .foot-copy{flex-direction:column;gap:8px}
  .hero-caption{flex-direction:column;gap:4px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .rv{opacity:1;transform:none}
}