:root{--bg:#F7F1E1;--bg-2:#EFE6CF;--ink:#1B1B1B;--muted:#5A5648;--gold:#B8921F;--gold-2:#C9A227;--rule:#D9CFB4;--card:#FFFDF7;--accent-book:#1E3A2B;--max:1100px}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#15191C;--bg-2:#1C2126;--ink:#F2E8CF;--muted:#B9B1A0;--gold:#C9A227;--gold-2:#D9B547;--rule:#2E353B;--card:#1C2126}}
:root[data-theme="dark"]{--bg:#15191C;--bg-2:#1C2126;--ink:#F2E8CF;--muted:#B9B1A0;--gold:#C9A227;--gold-2:#D9B547;--rule:#2E353B;--card:#1C2126}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 "Libre Baskerville",Georgia,"Times New Roman",serif}
a{color:inherit}
main{max-width:var(--max);margin:0 auto;padding:0 16px}
h1,h2,h3{line-height:1.15;margin:0 0 .5em;font-weight:700}
h2{font-size:1.5rem;margin-top:0}
p{margin:0 0 1em}
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:var(--max);margin:0 auto;padding:18px 16px;flex-wrap:wrap}
.brand{text-decoration:none;font-weight:700;letter-spacing:.06em;font-size:1.05rem}
.brand-blank{color:var(--gold);margin-left:.35em}
nav{display:flex;gap:18px;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.95rem}
nav a{text-decoration:none;color:var(--muted)}
nav a:hover{color:var(--ink)}
.hero{padding:56px 0 32px;text-align:center;max-width:780px;margin:0 auto}
.hero-small{padding-top:32px}
.hero h1{font-size:clamp(2.6rem,8vw,5rem);letter-spacing:.04em;margin-bottom:.35em}
.hero .blank{color:var(--gold);border-bottom:0}
.eyebrow{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;text-transform:uppercase;letter-spacing:.18em;font-size:.75rem;color:var(--muted);margin-bottom:.8em}
.lede{font-size:1.2rem}
.lede-sub{color:var(--muted)}
.btn{display:inline-block;padding:11px 18px;margin:4px 4px 4px 0;border:1.5px solid var(--ink);border-radius:6px;text-decoration:none;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.95rem;font-weight:600}
.btn:hover{background:var(--bg-2)}
.btn-primary{background:var(--ink);color:var(--bg)}
.btn-primary:hover{background:var(--gold);border-color:var(--gold);color:#1B1B1B}
.btn-disabled{border-style:dashed;color:var(--muted);cursor:default}
section{padding:28px 0}
.books h2,.calcs h2,.about h2{text-align:center}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px;margin-top:20px}
.card{display:block;text-decoration:none;background:var(--card);border:1px solid var(--rule);border-radius:10px;overflow:hidden;transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(0,0,0,.12)}
.card img{display:block;width:100%;height:auto;background:var(--c)}
.card-body{padding:16px 18px 18px}
.card h3{font-size:1.2rem;margin-bottom:.3em}
.card p{color:var(--muted);font-size:.95rem;margin-bottom:.8em}
.card-cta{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.9rem;font-weight:600;color:var(--gold)}
.calcs,.about{max-width:780px;margin:0 auto}
.calcs ul{padding-left:1.2em}
.book{display:grid;grid-template-columns:minmax(220px,1fr) 2fr;gap:40px;padding:32px 0;align-items:start}
.book-cover img{width:100%;height:auto;border-radius:6px;box-shadow:0 12px 36px rgba(0,0,0,.22)}
.book h1{font-size:clamp(2rem,5vw,3rem)}
.subtitle{font-style:italic;font-size:1.15rem;color:var(--muted)}
.hook{font-size:1.15rem}
.specs,.fine{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.85rem;color:var(--muted)}
.inside{padding-left:1.2em}
.inside li{margin-bottom:.5em}
.actions{margin:18px 0 6px}
.calc-list{list-style:none;padding:0;max-width:780px;margin:0 auto}
.calc{border-left:5px solid var(--c);padding:6px 0 6px 20px;margin-bottom:36px}
footer{border-top:1px solid var(--rule);margin-top:48px;padding:28px 16px;text-align:center;color:var(--muted);font-size:.9rem}
footer p{margin:0 0 .4em}
footer a{color:inherit}
.grid-1{grid-template-columns:minmax(200px,280px);justify-content:center}
.calc-hero{border-top:5px solid var(--c);padding-top:28px}
.calc-hero .eyebrow a{text-decoration:none;color:var(--c)}
.calc-app{display:grid;grid-template-columns:minmax(260px,340px) 1fr;gap:32px;align-items:start}
.calc-summary{position:sticky;top:12px;background:var(--card);border:1px solid var(--rule);border-top:5px solid var(--c);border-radius:10px;padding:18px 18px 10px}
.calc-summary h2{font-size:1.2rem}
.calc-summary h3{font-size:1rem;margin-top:18px}
.stat{display:flex;justify-content:space-between;gap:12px;padding:6px 0;border-bottom:1px solid var(--rule);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.9rem}
.stat .value{font-weight:600;white-space:nowrap}
.stat.big{display:block;border:0;padding:10px 0 14px}
.stat.big .label{display:block;font-size:.8rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.stat.big .value{display:block;font:700 2.2rem/1.1 "Libre Baskerville",Georgia,serif;color:var(--c)}
.calc-section{background:var(--card);border:1px solid var(--rule);border-radius:10px;padding:18px;margin-bottom:22px}
.calc-section h2{font-size:1.2rem;margin-bottom:.3em}
.settings{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.field{display:flex;flex-direction:column;gap:4px;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.9rem}
.field small{color:var(--muted)}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.data{width:100%;border-collapse:collapse;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:.9rem;margin:8px 0 12px}
table.data th{text-align:left;font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:6px 6px 6px 0;border-bottom:2px solid var(--rule);white-space:nowrap}
table.data td{padding:4px 6px 4px 0;border-bottom:1px solid var(--rule);vertical-align:middle}
table.data tfoot td{font-weight:700;border-bottom:0;padding-top:8px}
table.data input,table.data select,.field input{width:100%;min-width:90px;box-sizing:border-box;padding:7px 8px;border:1px solid var(--rule);border-radius:6px;background:var(--bg);color:var(--ink);font:inherit}
table.data input[type=number]{min-width:80px}
table.data input[type=date]{min-width:130px}
table.data td:last-child{width:28px;padding-right:0}
button.x{border:0;background:transparent;color:var(--muted);font-size:1.2rem;cursor:pointer;padding:2px 6px}
button.x:hover{color:#B3261E}
button.btn{cursor:pointer;background:var(--card);color:var(--ink)}
.btn-danger{border-color:#B3261E;color:#B3261E}
.toolbar{margin-top:14px}
.muted{color:var(--muted)}
@media (max-width:860px){.calc-app{grid-template-columns:1fr}.calc-summary{position:static}}
@media print{.top,footer,.toolbar,button,.books,.calc-hero .fine{display:none !important}.calc-app{grid-template-columns:1fr}.calc-summary{position:static;border:0}}
@media (max-width:720px){.book{grid-template-columns:1fr;gap:24px}.book-cover{max-width:320px;margin:0 auto}.top{justify-content:center}}