:root{
  --bg:#f5f5f7; --surface:#fff; --text:#1d1d1f; --muted:#6e6e73; --line:#d2d2d7;
  --accent:#ff3b30; --blue:#0071e3; --blue-ink:#fff; --good:#248a3d; --band:rgba(255,59,48,.14);
  --nav:rgba(245,245,247,.72); --shadow:0 1px 2px rgba(0,0,0,.04),0 8px 30px rgba(0,0,0,.06);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#000;--surface:#1c1c1e;--text:#f5f5f7;--muted:#a1a1a6;--line:#38383a;--accent:#ff453a;--blue:#2997ff;--blue-ink:#000;--good:#30d158;--band:rgba(255,69,58,.2);--nav:rgba(0,0,0,.72);--shadow:none}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:60px}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.47 -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px;border-radius:6px}

.nav{position:sticky;top:0;z-index:10;background:var(--nav);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line)}
.navin{max-width:980px;margin:0 auto;padding:0 20px;height:52px;display:flex;align-items:center;gap:20px}
.brand{font-weight:600;color:var(--text);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.links{display:flex;gap:20px;margin-left:auto;font-size:14px}
.links a{color:var(--muted)}
.links a:hover{color:var(--text);text-decoration:none}
.pill{background:var(--blue);color:var(--blue-ink);padding:6px 14px;border-radius:980px;font-size:14px;font-weight:500}
.pill:hover{text-decoration:none;filter:brightness(1.08)}
@media (max-width:560px){.links{display:none}.pill{margin-left:auto}}

.hero{padding:72px 0 56px;text-align:center}
.eyebrow{font-size:15px;font-weight:600;color:var(--accent);margin:0 0 10px}
h1{font-size:clamp(42px,8.5vw,84px);line-height:1.04;letter-spacing:-.035em;font-weight:700;margin:0 auto 18px;max-width:14ch}
.lede{font-size:clamp(19px,3vw,24px);line-height:1.35;color:var(--muted);max-width:34em;margin:0 auto 36px;font-weight:400}
.herochart{position:relative;background:var(--surface);border-radius:28px;box-shadow:var(--shadow);padding:16px 16px 8px;text-align:left}
#heroCanvas{display:block;width:100%;height:clamp(240px,46vw,420px)}
.herostats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;padding:14px 8px 10px;text-align:center}
.herostats b{display:block;font-size:clamp(24px,5vw,40px);letter-spacing:-.02em;font-variant-numeric:tabular-nums;line-height:1.1}
.herostats div:nth-child(2) b,.herostats div:nth-child(3) b{color:var(--accent)}
.herostats span{font-size:13px;color:var(--muted)}
.heronote{font-size:13px;color:var(--muted);margin:14px auto 28px;max-width:46em}
.link{background:none;border:0;color:var(--blue);font:inherit;cursor:pointer;padding:0}
.btn{display:inline-block;background:var(--blue);color:var(--blue-ink);font:inherit;font-size:16px;font-weight:500;line-height:1.2;padding:12px 22px;border-radius:980px;border:1px solid transparent;cursor:pointer;margin:4px 3px;transition:filter .15s,background-color .15s,transform .1s}
.btn:hover{text-decoration:none;filter:brightness(1.08)}
.btn:active{transform:scale(.98);filter:brightness(.96)}
.btn.ghost{background:color-mix(in srgb,var(--blue) 12%,transparent);color:var(--blue)}
.btn.ghost:hover{background:color-mix(in srgb,var(--blue) 20%,transparent);text-decoration:none;filter:none}
.btn.ghost:active{background:color-mix(in srgb,var(--blue) 26%,transparent)}
.actions .btn,.share .btn{margin:0}
.btn.small{padding:10px 20px;font-size:16px;width:100%;margin:0;min-height:52px}

section{padding:72px 0 8px}
h2{font-size:clamp(30px,5.5vw,48px);line-height:1.08;letter-spacing:-.03em;font-weight:700;margin:0 0 12px}
h3{margin:0 0 6px;font-size:21px;letter-spacing:-.015em;line-height:1.2}
.sub{color:var(--muted);font-size:clamp(17px,2.4vw,21px);line-height:1.38;margin:0 0 28px;max-width:38em}
.note{color:var(--muted);font-size:13.5px;max-width:48em;margin-top:14px}

.reasons{list-style:none;counter-reset:r;padding:0;margin:0;display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.reasons li{counter-increment:r;background:var(--surface);border-radius:22px;padding:26px;box-shadow:var(--shadow)}
.reasons li::before{content:counter(r,decimal-leading-zero);display:block;font-size:14px;font-weight:600;color:var(--accent);margin-bottom:10px;font-variant-numeric:tabular-nums}
.reasons p{margin:0;color:var(--muted)}

.tool{background:var(--surface);border-radius:28px;padding:26px;box-shadow:var(--shadow)}
.row{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:16px}
label,.field{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:500;color:var(--muted);flex:1 1 150px}
.btnlabel{justify-content:flex-end}
input[type=number]{font:inherit;font-size:19px;padding:11px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--text);width:100%}
input[type=number]{-moz-appearance:textfield;appearance:textfield}
input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
input[type=number]:focus,.leg input:focus{outline:2px solid var(--blue);border-color:transparent}
input[type=number]:hover,.leg input:hover{border-color:var(--muted)}
input[type=range]{width:100%;accent-color:var(--blue)}
output{font-weight:600;color:var(--text)}
.out{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin-top:8px}
.stat{background:var(--bg);border-radius:16px;padding:16px}
.stat b{display:block;font-size:clamp(24px,4vw,32px);letter-spacing:-.02em;line-height:1.1;font-variant-numeric:tabular-nums}
.stat span{font-size:13px;color:var(--muted)}
.bad b{color:var(--accent)}
.ok b{color:var(--good)}
.msg{grid-column:1/-1;background:var(--bg);border-radius:12px;padding:12px 16px;color:var(--muted)}
.tablewrap{overflow-x:auto;margin-top:18px}
table{border-collapse:collapse;width:100%;font-size:15px;font-variant-numeric:tabular-nums}
th{font-weight:500;color:var(--muted);font-size:13px}
th,td{padding:10px 12px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
tr.hl td{background:var(--band);font-weight:600}
figure{margin:20px 0 0}
svg{width:100%;height:auto;display:block}
figcaption{font-size:14px;color:var(--muted);margin-top:8px}

#counter p{font-size:19px;color:var(--muted);max-width:40em}
#counter p b{color:var(--text)}
.story{background:var(--surface);border-radius:28px;padding:30px;box-shadow:var(--shadow);font-size:clamp(19px,2.8vw,24px);line-height:1.4;letter-spacing:-.01em}
.story p{margin:0 0 14px}.story p:last-child{margin:0}
footer{margin-top:72px;padding:28px 0 48px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
code{background:var(--bg);padding:1px 6px;border-radius:6px;font-size:.92em}

.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}}

.byyear{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.byyear .chip{flex:1 1 110px;background:var(--bg);border-radius:16px;padding:12px 14px}
.byyear .chip b{display:block;font-size:24px;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.byyear .chip span{font-size:12.5px;color:var(--muted)}
.byyear .lead{flex:1 1 100%;font-size:14px;color:var(--muted)}
.share{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}
.sharemsg{font-size:14px;color:var(--muted)}

.seg{display:flex;gap:2px;padding:3px;background:var(--bg);border:1px solid var(--line);border-radius:12px}
.seg button{flex:1;font:inherit;font-size:15px;font-weight:500;padding:9px 10px;border:0;border-radius:9px;background:transparent;color:var(--muted);cursor:pointer;transition:background-color .15s,color .15s}
.seg button:hover{color:var(--text)}
.seg button[aria-checked="true"]{background:var(--surface);color:var(--text);font-weight:600;box-shadow:0 1px 3px rgba(0,0,0,.18),0 0 0 .5px var(--line)}
.hint{font-size:12.5px;font-weight:400;color:var(--muted)}
.legs{display:grid;grid-template-columns:minmax(0,1fr);gap:10px;margin-bottom:12px}
.leg{position:relative;display:flex;align-items:center;gap:10px}
.leg .n{width:54px;font-size:14px;color:var(--muted)}
.leg input{font:inherit;font-size:19px;padding:11px 46px 11px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--text);flex:1;min-width:0}
.leg input.err{border-color:var(--accent)}
.leg .x{position:absolute;right:6px;top:50%;margin-top:-18px;width:36px;height:36px;display:grid;place-items:center;background:none;border:0;color:var(--muted);font-size:22px;line-height:1;cursor:pointer;border-radius:50%;transition:background-color .15s,color .15s}
.leg .x:hover{color:var(--accent);background:var(--bg)}
.bigline{grid-column:1/-1;font-size:clamp(20px,3.2vw,26px);letter-spacing:-.015em;line-height:1.3;padding:6px 2px 2px}
.bigline b{color:var(--accent)}

label.wide,.field.wide{flex-basis:100%}
.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
@media (max-width:600px){
  body{font-size:16px}
  .hero{padding:44px 0 40px}
  section{padding:52px 0 4px}
  .tool{padding:18px;border-radius:22px}
  .herochart{border-radius:22px;padding:12px 10px 4px}
  .row{gap:12px}
  label{flex:1 1 40%}
  label.wide,.field.wide{flex-basis:100%}
  input[type=number]{font-size:18px;padding:10px 12px}
  .seg button{font-size:14px;padding:9px 4px}
  .out{grid-template-columns:1fr 1fr;gap:10px}
  .stat{padding:14px}
  .stat b{font-size:24px}
  .stat span{font-size:12.5px;line-height:1.35;display:block;margin-top:2px}
  .bigline,.msg{grid-column:1/-1}
  .byyear .chip{flex:1 1 40%}
  .btn{display:block;width:100%;text-align:center;margin:8px 0 0}
  .btn.small{width:100%}
  .share,.slipactions{display:grid;grid-template-columns:1fr;gap:8px}
  .share .btn,.slipactions .btn{margin:0}
  .hero .btn{display:inline-block;width:auto;min-width:230px}
  .sharemsg{text-align:center}
  .reasons{gap:12px}
  .reasons li{padding:20px;border-radius:18px}
  .story{padding:22px;border-radius:22px}
  .leg .n{width:46px}
}