:root{--ink:#1c2733;--mut:#5b6b7a;--teal:#0f766e;--teal-d:#0b5f58;--amber:#b45309;--line:#dfe6ec;--bg:#f6f8f9;--card:#ffffff;--soft:#eef4f3}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;font-size:17px}
a{color:var(--teal)}
h1,h2,h3{line-height:1.25;margin:0 0 .5em}
h1{font-size:1.7rem}h2{font-size:1.35rem;margin-top:1.8em}h3{font-size:1.1rem}
p{margin:0 0 1em}
.wrap{max-width:880px;margin:0 auto;padding:0 16px}
header.site{background:var(--ink);color:#fff}
header.site .wrap{display:flex;align-items:center;gap:18px;padding:12px 16px}
.logo{font-weight:800;font-size:1.25rem;color:#fff;text-decoration:none;letter-spacing:.02em}
.logo span{color:#f59e0b}
nav.main{margin-left:auto;display:flex;gap:16px}
nav.main a{color:#d7e0e8;text-decoration:none;font-size:.95rem}
nav.main a:hover{color:#fff}
.crumbs{font-size:.85rem;color:var(--mut);margin:14px 0 0}
.crumbs a{text-decoration:none}
.hero{background:var(--teal);color:#fff;padding:34px 0 30px}
.hero h1{font-size:2rem;margin-bottom:.3em}
.hero p{max-width:640px;color:#d9efec;margin:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:20px;margin:20px 0}
.calc{margin-top:18px}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 16px}
@media(max-width:640px){.calc-grid{grid-template-columns:1fr}}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:4px}
.field .unit{font-weight:400;color:var(--mut);font-size:.85rem}
.field input,.field select{width:100%;padding:10px 12px;font-size:1rem;border:1px solid #b9c4cd;border-radius:6px;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus{outline:2px solid var(--teal);outline-offset:1px}
.field .hint{font-size:.82rem;color:var(--mut);margin-top:3px}
.check{display:flex;gap:8px;align-items:flex-start;font-weight:600;font-size:.95rem}
.check input{width:18px;height:18px;margin-top:2px;flex:none}
.results{background:var(--soft);border:1px solid #cfe3e0;border-radius:10px;padding:18px 20px;margin-top:18px}
.results h2{margin-top:0;font-size:1.1rem}
.res-row{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-bottom:1px solid #dce7e5}
.res-row:last-child{border-bottom:0}
.res-row .k{color:var(--ink)}
.res-row .v{font-weight:700;white-space:nowrap}
.res-row.hero-row .v{font-size:1.3rem;color:var(--teal-d)}
.buy{border-left:4px solid var(--amber)}
.buy h3{margin:0 0 6px;font-size:1rem;color:var(--amber)}
.note{font-size:.88rem;color:var(--mut)}
table{border-collapse:collapse;width:100%;margin:0 0 1em;font-size:.95rem}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}
th{background:var(--soft)}
.faq{border:1px solid var(--line);border-radius:8px;margin:0 0 10px;background:#fff}
.faq summary{cursor:pointer;padding:12px 14px;font-weight:600}
.faq div{padding:0 14px 12px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:16px 0}
.tile{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;text-decoration:none;color:var(--ink);display:block}
.tile:hover{border-color:var(--teal)}
.tile h3{margin:0 0 4px;color:var(--teal-d)}
.tile p{margin:0;font-size:.9rem;color:var(--mut)}
.tile .tag{font-size:.75rem;color:var(--amber);font-weight:700;text-transform:uppercase;letter-spacing:.04em}
.soon{color:var(--mut);font-size:.95rem}
.ad-slot{border:1.5px dashed #c4ccd3;border-radius:8px;background:#fafbfc;text-align:center;color:#93a1ad;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;padding:22px 10px;margin:26px 0}
.author{display:flex;gap:16px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:20px 22px;margin:26px 0;background:#fff}
.author .avatar{flex:0 0 auto;width:56px;height:56px;border-radius:50%;object-fit:cover;display:block}
.author h2{margin:0 0 4px;font-size:1.05rem}
.author p{margin:0 0 8px;color:#3c4753}
.author a{font-weight:600}
footer.site{border-top:1px solid var(--line);margin-top:40px;padding:22px 0 30px;color:var(--mut);font-size:.88rem}
footer.site a{color:var(--mut)}
.btn{display:inline-block;background:var(--teal);color:#fff;border:0;border-radius:6px;padding:10px 16px;font-weight:700;cursor:pointer;font-size:1rem}
.btn:hover{background:var(--teal-d)}
.addline{display:flex;justify-content:space-between;gap:10px;padding:6px 0;border-bottom:1px solid #dce7e5;font-size:.95rem}
.total-line{font-weight:700}
.formula{background:var(--soft);border-radius:8px;padding:14px 16px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92rem;overflow-x:auto}