:root{--y:#FFC400;--ink:#111111;--bg:#f6f6f4;--panel:#fff;--text:#111;--text2:#3a3a38;--mute:#6c6c68;--hair:rgba(17,17,17,.09);--link:#8a6700;--logo:#111;color-scheme:light}
@media (prefers-color-scheme:dark){:root{--bg:#111;--panel:#191919;--text:#f5f5f3;--text2:#cacac6;--mute:#8e8e8a;--hair:rgba(255,255,255,.09);--link:#FFC400;--logo:#fff;color-scheme:dark}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--link)}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px max(20px,env(safe-area-inset-left));background:color-mix(in srgb,var(--bg) 78%,transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--hair)}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:600;letter-spacing:-.01em}
.brand span{padding-left:10px;border-left:1px solid var(--hair);color:var(--text2)}
.zlogo{height:20px;width:auto;display:block}.zlogo text{fill:var(--logo)}
.cta{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:36px;padding:0 16px;border:0;border-radius:10px;background:var(--y);color:var(--ink);font:600 14px/1 inherit;font-family:inherit;text-decoration:none;cursor:pointer;transition:transform .1s ease-out,filter .15s}
.cta:hover{filter:brightness(1.05)}.cta:active{transform:scale(.97)}
.cta.big{min-height:44px;padding:0 20px;font-size:15px;margin:6px 0 10px}
main{max-width:740px;margin:0 auto;padding:36px max(20px,env(safe-area-inset-left)) 40px}
.crumbs{font-size:13px;color:var(--mute);margin-bottom:18px}.crumbs a{color:var(--mute)}
h1{margin:0 0 14px;font-size:clamp(30px,5vw,44px);line-height:1.08;letter-spacing:-.03em;text-wrap:balance}
.lede{margin:0 0 18px;font-size:19px;line-height:1.5;color:var(--text2)}
h2{margin:40px 0 10px;font-size:23px;line-height:1.25;letter-spacing:-.02em}
p,li{color:var(--text2)}li{margin:6px 0}b{color:var(--text)}
table{width:100%;border-collapse:collapse;margin:12px 0;font-size:15px}th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--hair)}th{color:var(--mute);font-weight:600;font-size:13px}
.faq details{border-bottom:1px solid var(--hair)}.faq summary{cursor:pointer;padding:12px 0;font-weight:600}.faq p{margin:0 0 14px}
.try{margin:44px 0 0;padding:24px;border-radius:16px;background:var(--ink);color:#f5f5f3;display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.try p{margin:0;flex:1;min-width:220px;color:#cfcfca}.try b{color:#fff}
.related ul{list-style:none;padding:0;display:grid;gap:8px}.related a{display:block;padding:12px 14px;border-radius:10px;background:var(--panel);box-shadow:inset 0 0 0 1px var(--hair);color:var(--text);text-decoration:none;font-weight:600}
.related a:hover{box-shadow:inset 0 0 0 1px var(--y)}
footer{max-width:740px;margin:0 auto;padding:24px max(20px,env(safe-area-inset-left)) 48px;border-top:1px solid var(--hair);display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13px;color:var(--mute)}
footer a{color:var(--mute);text-decoration:none}footer a:hover{color:var(--text)}
.calc{display:flex;flex-direction:column;gap:12px;padding:20px;border-radius:16px;background:var(--panel);box-shadow:inset 0 0 0 1px var(--hair);margin:8px 0 10px}
.calc label{font-size:13px;font-weight:600;color:var(--text2)}
.calc textarea,.calc input[type=number]{font:inherit;font-size:15px;color:var(--text);background:var(--bg);border:1px solid var(--hair);border-radius:10px;padding:10px 12px}
.calc-row{display:grid;grid-template-columns:auto 110px auto minmax(0,1fr) auto;align-items:center;gap:10px}
.calc input[type=range]{accent-color:#FFC400}
.calc output{font-variant-numeric:tabular-nums;font-size:14px;color:var(--text2)}
.calc-out{display:flex;align-items:baseline;gap:12px;margin:4px 0}.calc-out b{font-size:40px;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.calc-table td:last-child{font-variant-numeric:tabular-nums}
@media (max-width:560px){.calc-row{grid-template-columns:auto minmax(0,1fr)}.calc-row output{grid-column:2}}