/* Forge Numbers — design system
   Navy + emerald + gold · Space Grotesk / Inter · modern micro-interactions */
:root{
  --ink:#0E1B2C; --ink2:#17293D; --emerald:#12A67A; --emerald-d:#0C7E5C; --mint:#DCF2E9;
  --gold:#E5A73C; --gold-d:#C6841C; --bone:#F6F5F1; --paper:#FFFFFF;
  --text:#12202E; --muted:#5E6E7C; --line:#E7EBEE; --line2:#DDE3E7;
  --danger:#D8564A; --danger-bg:#FBEBE9;
  --shadow:0 1px 2px rgba(14,27,44,.04),0 8px 24px rgba(14,27,44,.06);
  --shadow-lg:0 2px 4px rgba(14,27,44,.05),0 18px 44px rgba(14,27,44,.13);
  --r:14px; --sans:'Inter',system-ui,-apple-system,sans-serif; --head:'Space Grotesk','Inter',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--text);background:var(--bone);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,.h{font-family:var(--head);font-weight:600;letter-spacing:-.02em;line-height:1.15;color:var(--ink)}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.narrow{max-width:760px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(246,245,241,.72);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:border-color .3s,box-shadow .3s,background .3s}
.nav.scrolled{background:rgba(246,245,241,.9);border-bottom-color:var(--line);box-shadow:0 4px 20px rgba(14,27,44,.05)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--head);font-weight:600;font-size:19px;color:var(--ink)}
.logo{width:34px;height:34px;border-radius:9px;background:var(--ink);display:grid;place-items:center;color:#fff;flex:none}
.logo svg{width:19px;height:19px}
.logo-mark{width:38px;height:38px;flex:none;background:url(brand/fn-mark-dark.png) center/contain no-repeat;display:inline-block}
footer .logo-mark{background-image:url(brand/fn-mark-light.png)}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:15px;color:var(--ink2);font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--emerald)}
.menu-btn{display:none;background:none;border:none;color:var(--ink);cursor:pointer}

/* buttons */
.btn{font-family:var(--sans);font-weight:600;font-size:15px;border:none;border-radius:11px;padding:12px 22px;cursor:pointer;transition:transform .12s cubic-bezier(.34,1.56,.64,1),box-shadow .2s,background .2s,border-color .2s;display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.btn-primary{background:var(--emerald);color:#fff;box-shadow:0 2px 10px rgba(18,166,122,.28)}
.btn-primary:hover{background:var(--emerald-d);box-shadow:0 6px 20px rgba(18,166,122,.38);transform:translateY(-2px)}
.btn-primary:active{transform:translateY(0) scale(.98)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line2)}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-2px)}
.btn-gold{background:var(--gold);color:#3a2a08}
.btn-gold:hover{background:var(--gold-d);transform:translateY(-2px)}

/* hero */
.hero{padding:64px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--head);font-size:13px;font-weight:500;letter-spacing:.02em;color:var(--emerald-d);background:var(--mint);padding:6px 14px;border-radius:100px;margin-bottom:22px}
.eyebrow svg{width:14px;height:14px}
.hero h1{font-size:52px;margin-bottom:18px}
.hero h1 .u{color:var(--emerald)}
.hero p.sub{font-size:19px;color:var(--muted);max-width:30em;margin-bottom:28px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.trust{display:flex;gap:22px;flex-wrap:wrap;color:var(--muted);font-size:14px}
.trust span{display:flex;align-items:center;gap:7px}
.trust svg{width:17px;height:17px;color:var(--emerald)}

/* calculator card (shared) */
.calc{background:var(--paper);border-radius:20px;padding:26px 26px 28px;box-shadow:var(--shadow-lg);border:1px solid var(--line)}
.calc-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.calc-head .t{font-family:var(--head);font-weight:600;font-size:17px;color:var(--ink)}
.calc-tag{font-size:12px;font-weight:600;color:var(--emerald-d);background:var(--mint);padding:4px 10px;border-radius:100px}
.field{margin-bottom:17px}
.field-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:9px}
.field-top label{font-size:14px;color:var(--muted);font-weight:500}
.field-top .val{font-family:var(--head);font-weight:600;font-size:16px;color:var(--ink)}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:100px;background:var(--line2);outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#fff;border:none;box-shadow:0 1px 4px rgba(14,27,44,.25),0 0 0 5px var(--emerald);cursor:grab;transition:transform .15s,box-shadow .15s}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.12)}
input[type=range]::-webkit-slider-thumb:active{cursor:grabbing;box-shadow:0 1px 4px rgba(14,27,44,.25),0 0 0 8px rgba(18,166,122,.28)}
input[type=range]::-moz-range-thumb{width:22px;height:22px;border-radius:50%;background:#fff;border:none;box-shadow:0 1px 4px rgba(14,27,44,.25),0 0 0 5px var(--emerald);cursor:grab}
.result{margin-top:22px;background:var(--ink);border-radius:15px;padding:20px 22px;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:16px;overflow:hidden}
.result .lab{font-size:13px;color:#9db4c9;font-weight:500}
.result .big{font-family:var(--head);font-weight:700;font-size:34px;letter-spacing:-.02em;transition:opacity .28s;color:#fff}
.result .big.flash{opacity:.25}
.result .sub2{font-size:12px;color:#7f98ad;margin-top:2px}
.result .gold-chip{width:44px;height:44px;border-radius:12px;background:rgba(229,167,60,.16);display:grid;place-items:center;color:var(--gold);flex:none}
.result .gold-chip svg{width:22px;height:22px}

/* number/text/select inputs for tool pages */
.in-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.in-field label{display:block;font-size:14px;color:var(--muted);font-weight:500;margin-bottom:7px}
.in-wrap{position:relative}
.in-wrap .pre,.in-wrap .post{position:absolute;top:50%;transform:translateY(-50%);color:var(--muted);font-size:15px;pointer-events:none}
.in-wrap .pre{left:14px}.in-wrap .post{right:14px}
input[type=number],input[type=text],select{width:100%;font-family:var(--sans);font-size:16px;color:var(--ink);background:var(--paper);border:1.5px solid var(--line2);border-radius:11px;padding:12px 14px;outline:none;transition:border-color .2s,box-shadow .2s;-moz-appearance:textfield}
input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.in-wrap.has-pre input{padding-left:30px}
.in-wrap.has-post input{padding-right:44px}
input:focus,select:focus{border-color:var(--emerald);box-shadow:0 0 0 4px rgba(18,166,122,.14)}
.seg{display:inline-flex;background:var(--bone);border:1px solid var(--line2);border-radius:11px;padding:3px;gap:2px}
.seg button{font-family:var(--sans);font-size:14px;font-weight:600;color:var(--muted);background:none;border:none;padding:8px 16px;border-radius:8px;cursor:pointer;transition:all .18s}
.seg button.on{background:var(--paper);color:var(--ink);box-shadow:0 1px 3px rgba(14,27,44,.1)}

/* stat cards row (tool results) */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px}
.stat{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.stat .k{font-size:13px;color:var(--muted);margin-bottom:6px}
.stat .v{font-family:var(--head);font-weight:700;font-size:26px;color:var(--ink);letter-spacing:-.02em}
.stat.accent{background:var(--ink)}
.stat.accent .k{color:#9db4c9}.stat.accent .v{color:#fff}
.stat.good .v{color:var(--emerald-d)}
.stat.warn .v{color:var(--gold-d)}

/* tool page layout */
.breadcrumb{font-size:14px;color:var(--muted);padding:22px 0 0}
.breadcrumb a{color:var(--emerald-d)}
.tool-head{padding:14px 0 30px}
.tool-head h1{font-size:38px;margin-bottom:12px}
.tool-head p{font-size:18px;color:var(--muted);max-width:44em}
.tool-layout{display:grid;grid-template-columns:1.15fr .85fr;gap:32px;align-items:start}
.panel{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}
.panel h3{font-size:16px;margin-bottom:18px}
.prose{max-width:720px}
.prose h2{font-size:26px;margin:38px 0 14px}
.prose h3{font-size:19px;margin:26px 0 10px}
.prose p{margin-bottom:16px;color:#33424f}
.prose ul{margin:0 0 16px 20px;color:#33424f}
.prose li{margin-bottom:8px}
.faq-q{font-family:var(--head);font-weight:600;color:var(--ink);margin:20px 0 6px;font-size:17px}

/* sections */
.sec{padding:66px 0}
.sec.tint{background:var(--paper)}
.sec-head{text-align:center;max-width:640px;margin:0 auto 42px}
.kick{font-family:var(--head);font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--emerald);margin-bottom:12px}
.sec-head h2{font-size:36px;margin-bottom:12px}
.sec-head p{color:var(--muted);font-size:17px}
.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:24px 22px;transition:transform .22s cubic-bezier(.34,1.3,.5,1),box-shadow .22s,border-color .22s;display:block}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--line2)}
.card .ic{width:46px;height:46px;border-radius:12px;background:var(--mint);color:var(--emerald-d);display:grid;place-items:center;margin-bottom:16px;transition:background .22s,color .22s}
.card:hover .ic{background:var(--emerald);color:#fff}
.card .ic svg{width:23px;height:23px}
.card h3{font-size:17px;margin-bottom:6px}
.card p{font-size:14px;color:var(--muted);line-height:1.5}
.card .go{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-size:14px;font-weight:600;color:var(--emerald-d);opacity:0;transform:translateX(-6px);transition:opacity .22s,transform .22s}
.card:hover .go{opacity:1;transform:translateX(0)}

/* shop band */
.shop{background:var(--ink);border-radius:26px;padding:52px 54px;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;position:relative;overflow:hidden}
.shop::after{content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;border-radius:50%;background:rgba(18,166,122,.14)}
.shop .kick{color:var(--gold)}
.shop h2{color:#fff;font-size:34px;margin-bottom:14px}
.shop p{color:#9db4c9;font-size:16px;margin-bottom:22px;max-width:34em}
.shop-feats{display:flex;flex-direction:column;gap:11px;margin-bottom:26px}
.shop-feats div{display:flex;align-items:center;gap:11px;color:#dbe6ef;font-size:15px}
.shop-feats svg{width:19px;height:19px;color:var(--emerald);flex:none}
.price-box{position:relative;z-index:2;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:28px;text-align:center}
.price-box .amt{font-family:var(--head);font-weight:700;font-size:46px;color:#fff}
.price-box .amt s{font-size:22px;color:#6f8aa1;font-weight:400;margin-right:8px}
.price-box .note{color:#9db4c9;font-size:13px;margin:6px 0 20px}
.badge3{display:flex;gap:8px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.badge3 span{font-size:12px;color:#bcd;background:rgba(255,255,255,.07);padding:5px 11px;border-radius:100px}

/* carousel (shop page) */
.mtk-carousel{width:100%;aspect-ratio:1/1;border-radius:18px;overflow:hidden;background:var(--paper);border:1px solid var(--line);position:relative}
.mtk-track{width:100%;height:100%}
.mtk-slide{position:absolute;inset:0;opacity:0;transition:opacity .6s}
.mtk-slide.active{opacity:1}
.mtk-slide img{width:100%;height:100%;object-fit:cover}
.mtk-dots{position:absolute;bottom:12px;left:0;right:0;display:flex;justify-content:center;gap:7px}
.mtk-dots button{width:8px;height:8px;border-radius:50%;border:none;background:rgba(14,27,44,.25);cursor:pointer;padding:0}
.mtk-dots button.on{background:var(--emerald)}
.mtk-ph{position:absolute;inset:0;display:grid;place-items:center;text-align:center;color:var(--muted);padding:24px}

/* reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}

/* footer */
footer{background:var(--ink);color:#9db4c9;padding:50px 0 34px;margin-top:20px}
footer .cols{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.08)}
footer h4{color:#fff;font-family:var(--head);font-size:14px;margin-bottom:14px;font-weight:500}
footer a{display:block;font-size:14px;color:#9db4c9;margin-bottom:9px;transition:color .2s}
footer a:hover{color:var(--emerald)}
footer .foot-brand{max-width:280px}
footer .foot-brand .brand{color:#fff;margin-bottom:12px}
footer .foot-brand p{font-size:14px}
footer .bottom{padding-top:22px;font-size:13px;color:#6f8aa1}

@media (max-width:860px){
  .hero-grid,.shop,.tool-layout{grid-template-columns:1fr;gap:34px}
  .hero h1{font-size:40px}.sec-head h2{font-size:29px}.tool-head h1{font-size:30px}
  .tools{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:1fr}
  .in-grid{grid-template-columns:1fr}
  .nav-links a:not(.btn){display:none}
  .shop{padding:36px 26px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}.reveal{opacity:1;transform:none}}