:root{
  --bg:#f5f8f5;
  --surface:#ffffff;
  --surface-2:#edf4ef;
  --text:#10231c;
  --muted:#5d6f67;
  --line:#d8e3dc;
  --green:#0c6f4e;
  --green-2:#0f8960;
  --lime:#dff56a;
  --dark:#07120f;
  --warning:#fff7d8;
  --warning-line:#ead67d;
  --radius:24px;
  --shadow:0 20px 55px rgba(9,52,37,.10);
  --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(circle at 90% -5%,rgba(27,148,99,.10),transparent 28rem),
    linear-gradient(180deg,#f8faf8 0,#f3f7f4 100%);
  color:var(--text);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit}
.wrap{width:min(calc(100% - 32px),var(--max));margin-inline:auto}
.skip{
  position:absolute;top:-80px;left:12px;z-index:100;
  background:#fff;color:#111;padding:10px 14px;border-radius:10px
}
.skip:focus{top:12px}
header{
  position:sticky;top:0;z-index:20;
  border-bottom:1px solid rgba(16,35,28,.08);
  background:rgba(248,250,248,.90);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px)
}
.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:850;letter-spacing:-.03em}
.brand img{width:34px;height:34px;display:block}
.nav-right{display:flex;align-items:center;gap:18px}
nav{display:flex;gap:20px;align-items:center}
nav a{text-decoration:none;color:var(--muted);font-size:.93rem}
nav a:hover{color:var(--text)}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 15px;
  border-radius:999px;background:var(--dark);color:#fff;text-decoration:none;font-size:.88rem;font-weight:800
}
.hero{padding:clamp(74px,9vw,120px) 0 64px}
.hero-grid{
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(340px,.95fr);
  gap:clamp(44px,7vw,90px);align-items:center
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.75);
  padding:7px 11px;color:var(--green);font-weight:760;font-size:.83rem
}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--green-2)}
h1{
  max-width:780px;margin:20px 0 20px;
  font-size:clamp(3rem,6.2vw,5.8rem);line-height:.97;letter-spacing:-.064em;font-weight:900
}
.lead{max-width:710px;margin:0;color:#42584f;font-size:clamp(1.08rem,2vw,1.30rem)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;min-height:52px;
  padding:0 20px;border-radius:999px;border:1px solid var(--line);text-decoration:none;
  font-weight:800;cursor:pointer;transition:transform .16s ease,background .16s ease
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--dark);color:#fff;border-color:var(--dark)}
.btn-primary:hover{background:#10251d}
.btn-secondary{background:#fff;color:var(--text)}
.micro{margin:13px 0 0;color:#65776e;font-size:.86rem}
.bill-card{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:32px;background:var(--surface);
  box-shadow:var(--shadow);padding:28px
}
.bill-card::after{
  content:"";position:absolute;width:240px;height:240px;border-radius:50%;
  background:rgba(12,111,78,.08);right:-95px;top:-85px;pointer-events:none
}
.bill-head{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:28px}
.bill-head strong{font-size:1.05rem}
.pill{font-size:.78rem;padding:6px 9px;border-radius:999px;background:var(--surface-2);color:var(--green);font-weight:760}
.bill-line{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0;border-top:1px solid var(--line)}
.bill-line span{color:var(--muted)}
.bill-line strong{font-variant-numeric:tabular-nums}
.bill-total{margin-top:10px;padding-top:19px;border-top:2px solid var(--dark);font-size:1.15rem}
.bill-total strong{font-size:1.65rem;color:var(--green)}
.answer-strip{
  margin-top:0;padding:22px 24px;border:1px solid #cfe3d6;border-radius:22px;background:#edf6f0
}
.answer-strip p{margin:0;color:#375047}
.answer-strip strong{color:var(--text)}
section{padding:74px 0}
.kicker{
  margin:0 0 10px;text-transform:uppercase;letter-spacing:.09em;color:var(--green);
  font-weight:850;font-size:.78rem
}
h2{max-width:800px;margin:0;font-size:clamp(2rem,4vw,3.7rem);line-height:1.04;letter-spacing:-.05em}
.intro{max-width:780px;margin:18px 0 0;color:var(--muted);font-size:1.05rem}
.calculator{
  display:grid;grid-template-columns:minmax(0,.94fr) minmax(340px,1.06fr);
  gap:18px;margin-top:34px
}
.calc-panel,.result-panel{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:26px;
  box-shadow:0 12px 38px rgba(9,52,37,.06)
}
.field{margin-top:18px}
.field:first-of-type{margin-top:0}
label{display:block;margin-bottom:8px;font-weight:780}
.help{display:block;margin-top:6px;color:#5d6f67;font-size:.82rem}
.error{display:none;margin-top:6px;color:#a22929;font-size:.82rem;font-weight:700}
.field.invalid .error{display:block}
.field.invalid input{border-color:#c94747;background:#fffafa;box-shadow:0 0 0 4px rgba(201,71,71,.08)}
.input-wrap{position:relative}
input{
  width:100%;height:54px;border:1px solid #cddbd2;border-radius:15px;background:#fbfdfb;color:var(--text);
  padding:0 112px 0 15px;font:inherit;font-size:1.05rem;outline:none
}
input:focus{border-color:var(--green-2);box-shadow:0 0 0 4px rgba(15,137,96,.11)}
.unit{
  position:absolute;right:12px;top:50%;transform:translateY(-50%);
  color:#65776e;font-size:.86rem;font-weight:730
}
.result-panel{
  background:var(--dark);color:#f6fbf8;border-color:var(--dark);
  display:flex;flex-direction:column;justify-content:space-between
}
.result-panel .kicker{color:var(--lime)}
.result-number{
  margin:10px 0 4px;font-size:clamp(3rem,7vw,5rem);font-weight:900;line-height:1;letter-spacing:-.06em;
  color:var(--lime);font-variant-numeric:tabular-nums
}
.result-sub{color:#b7c8c1;margin:0}
.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:26px}
.metric{border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:14px;background:rgba(255,255,255,.04)}
.metric span{display:block;color:#a9bbb3;font-size:.78rem;margin-bottom:5px}
.metric strong{font-variant-numeric:tabular-nums}
.result-note{margin-top:20px;color:#9fb0a9;font-size:.80rem}

.optional-label{font-weight:500;color:#5d6f67}
.result-note-last{margin-bottom:0}
.truth-title{font-size:clamp(2rem,3.4vw,3rem)}

.result-empty{display:grid;place-items:center;min-height:330px;text-align:center;padding:24px}
.result-empty strong{display:block;font-size:1.35rem;margin-bottom:8px;color:#f2f8f5}
.result-empty p{margin:0;color:#a9bbb3;max-width:420px}
.result-content[hidden],.result-empty[hidden]{display:none!important}
.compare-action{
  margin-top:18px;padding:20px;border:1px solid rgba(223,245,106,.35);
  border-radius:18px;background:rgba(223,245,106,.08)
}
.compare-action p{margin:0 0 14px;color:#c5d5ce}
.compare-action .btn{background:var(--lime);color:var(--dark);border-color:var(--lime)}
.notice{
  margin-top:22px;padding:20px 22px;border:1px solid var(--warning-line);
  background:var(--warning);border-radius:18px;color:#564a19
}
.notice strong{display:block;margin-bottom:4px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:34px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px}
.card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:24px}
.card .num{
  width:38px;height:38px;display:grid;place-items:center;border-radius:50%;
  background:var(--surface-2);color:var(--green);font-weight:850;margin-bottom:20px
}
.card strong{display:block;margin-bottom:8px}
.card p{margin:0;color:var(--muted)}
.truth{
  display:grid;grid-template-columns:.85fr 1.15fr;gap:30px;align-items:start;
  border:1px solid var(--line);border-radius:30px;background:var(--surface);padding:30px
}
.stack{display:grid;gap:10px}
.stack-row{
  display:flex;justify-content:space-between;gap:20px;align-items:center;
  padding:15px 17px;border-radius:16px;background:#f5f8f5
}
.stack-row span{color:var(--muted)}
.stack-row.em{background:#e8f4ed;border:1px solid #cfe6d8}
.stack-row.em strong{color:var(--green)}
.faq{display:grid;gap:12px;margin-top:30px}
details{border:1px solid var(--line);border-radius:18px;background:#fff;padding:0 20px}
summary{cursor:pointer;list-style:none;padding:19px 0;font-weight:790}
summary::-webkit-details-marker{display:none}
details p{margin:0 0 20px;color:var(--muted);max-width:850px}
.sourcebox{
  margin-top:34px;padding:24px;border-radius:22px;background:#eef4f0;border:1px solid var(--line)
}
.sourcebox p{margin:0 0 10px;color:var(--muted)}
.sourcebox a{color:var(--green);font-weight:760}
.final-action{
  text-align:center;padding:42px 26px;border:1px solid var(--line);border-radius:30px;background:var(--surface)
}
.final-action h2{margin-inline:auto}
.final-action p{max-width:680px;margin:16px auto 0;color:var(--muted)}
.final-action .cta-row{justify-content:center}
.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:28px}
.trust-item{padding:16px 18px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}
.trust-item strong{display:block;margin-bottom:4px}
.trust-item span{color:var(--muted);font-size:.88rem}
.about-box{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:28px;align-items:start;
  border:1px solid var(--line);border-radius:28px;background:var(--surface);padding:28px
}
.about-box p{margin:0 0 14px;color:var(--muted)}
.about-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.text-link{color:var(--green);font-weight:780;text-decoration-thickness:1px;text-underline-offset:3px}
footer{padding:34px 0 48px;color:#5d6f67;font-size:.82rem}
.foot{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;padding-top:24px;border-top:1px solid var(--line)}
.foot p{max-width:800px;margin:0}
.footlinks{display:flex;gap:14px;flex-wrap:wrap}
:focus-visible{outline:3px solid rgba(15,137,96,.48);outline-offset:3px}
@media(max-width:860px){
  .hero-grid,.calculator,.truth,.about-box{grid-template-columns:1fr}
  .grid3,.grid4,.trust-strip{grid-template-columns:1fr}
  .hero{padding-top:64px}
  .bill-card{max-width:620px}
  nav{display:none}
}
@media(max-width:600px){
  h1{font-size:clamp(2.8rem,13vw,4.3rem)}
  .btn{width:100%}
  .result-grid{grid-template-columns:1fr}
  .foot{flex-direction:column}
  input{padding-right:98px}
  section{padding:58px 0}
  .hero{padding-top:54px}
  .nav-cta{min-height:38px;padding:0 13px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important}
}


.method-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:16px;
  margin-top:28px
}
.method-card{
  border:1px solid var(--line);
  border-radius:22px;
  background:var(--surface);
  padding:22px
}
.method-card h3,.example-box h3,.method-note h3{margin:0 0 10px}
.method-card p{margin:0}
.formula{
  margin:12px 0!important;
  padding:12px 14px;
  border-radius:14px;
  background:var(--surface-2);
  overflow-wrap:anywhere
}
.formula code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
  color:var(--text);
  font-weight:760
}
.example-box{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(240px,.65fr);
  gap:22px;
  align-items:center;
  margin-top:20px;
  padding:24px;
  border:1px solid var(--line);
  border-radius:24px;
  background:#f8faf8
}
.example-box p{margin-bottom:0}
.example-math{
  display:grid;
  gap:7px;
  padding:18px;
  border-radius:18px;
  background:var(--dark);
  color:#f6fbf8
}
.example-math span{color:#c5d5ce;font-size:.86rem}
.example-math strong{font-size:1.15rem}
.method-note{
  margin-top:20px;
  padding:22px 24px;
  border-left:4px solid var(--green);
  border-radius:0 18px 18px 0;
  background:var(--surface-2)
}
.method-note p,.method-assumption{margin-bottom:0}
.method-assumption{
  margin-top:18px;
  color:var(--muted);
  font-size:.9rem
}
.source-updated{margin:12px 0 0!important;font-size:.86rem;color:var(--muted)}
@media(max-width:760px){
  .method-grid,.example-box{grid-template-columns:1fr}
}