/* OptiBooks — shared stylesheet
   Design notes: the structural device is the RULE, borrowed from accounting's own
   visual language (single rule separates, double rule totals). No cards.
   Palette is warm paper / cool ink / bronze accent — ledger and brass, not money-green. */

:root{
  --paper:#FBFAF8;
  --paper-2:#F4F2EE;
  --ink:#1A1F2B;
  --slate:#5C6472;
  --rule:#E0DDD6;
  --rule-strong:#1A1F2B;
  --accent:#8F5314;
  --accent-soft:#F2E9DE;
  --ok:#1F6F4A;
  --maxw:70rem;
  --read:38rem;
}

@media (prefers-color-scheme:dark){
  :root{
    --paper:#14161C;--paper-2:#1B1E26;--ink:#ECEAE5;--slate:#9AA1AD;
    --rule:#2A2E38;--rule-strong:#ECEAE5;--accent:#D79A4E;--accent-soft:#2A231A;--ok:#5CBE90;
  }
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,.serif{font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;font-weight:400}
.mono{font-family:"SF Mono","Cascadia Mono","Roboto Mono",Consolas,monospace;font-variant-numeric:tabular-nums}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem}
a{color:var(--accent);text-underline-offset:2px}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

/* ---- nav ---- */
.nav{border-bottom:1px solid var(--rule)}
.nav .wrap{display:flex;flex-wrap:wrap;gap:.5rem 2rem;align-items:baseline;padding-top:1.1rem;padding-bottom:1.1rem}
.brand{font-family:"Iowan Old Style",Palatino,Georgia,serif;font-size:1.25rem;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.brand b{font-weight:400;color:var(--accent)}
.nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:1.5rem;margin:0 0 0 auto;padding:0;font-size:.92rem}
.nav a:not(.brand){color:var(--slate);text-decoration:none}
.nav a:not(.brand):hover{color:var(--ink);text-decoration:underline}

/* ---- stage banner: the honesty line, deliberately not hidden ---- */
.stage{background:var(--accent-soft);border-bottom:1px solid var(--rule)}
.stage .wrap{padding:.7rem 1.5rem;font-size:.88rem;color:var(--ink)}
.stage strong{font-weight:600}

/* ---- hero ---- */
.hero{padding:4.5rem 0 3rem;border-bottom:1px solid var(--rule)}
.hero h1{font-size:clamp(2.1rem,5.2vw,3.4rem);line-height:1.1;letter-spacing:-.02em;margin:0 0 1.1rem;max-width:20ch;text-wrap:balance}
.hero p{font-size:1.2rem;color:var(--slate);max-width:var(--read);margin:0 0 1.6rem;text-wrap:pretty}
.hero .cta{display:inline-block;background:var(--ink);color:var(--paper);text-decoration:none;
  padding:.8rem 1.5rem;font-size:.95rem;font-weight:600;border-radius:2px}
.hero .cta:hover{background:var(--accent)}
.hero .cta-note{display:block;margin-top:.7rem;font-size:.86rem;color:var(--slate)}

/* ---- ruled sections ---- */
section{padding:3.5rem 0;border-bottom:1px solid var(--rule)}
section.total{border-bottom:3px double var(--rule-strong)}
.eyebrow{font-family:"SF Mono","Cascadia Mono",Consolas,monospace;font-size:.7rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--accent);margin:0 0 .9rem}
h2{font-size:clamp(1.5rem,3.2vw,2.05rem);line-height:1.2;letter-spacing:-.015em;margin:0 0 1rem;max-width:24ch;text-wrap:balance}
h3{font-size:1.12rem;margin:0 0 .4rem}
p{max-width:var(--read)}
.lede{font-size:1.06rem;color:var(--slate);max-width:var(--read)}

/* ---- ledger rows: the repeating structural unit ---- */
.rows{margin-top:2rem;border-top:1px solid var(--rule)}
.row{display:grid;grid-template-columns:11rem 1fr;gap:2rem;padding:1.4rem 0;border-bottom:1px solid var(--rule);align-items:start}
.row .k{font-family:"SF Mono","Cascadia Mono",Consolas,monospace;font-size:.72rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--slate);padding-top:.3rem}
.row p{margin:0;max-width:44rem}
.row p+p{margin-top:.5rem}

/* ---- the "what we don't do" block — deliberately prominent ---- */
.limits{background:var(--paper-2)}
/* Two columns on wide screens, one on narrow. The li is deliberately NOT a grid
   container: its content is mixed inline runs (a <b> plus loose text), and CSS grid
   promotes each run to its own grid item — which pushed the trailing sentence into
   the 1.4rem marker column and squeezed it against the left edge. */
.limits ul{list-style:none;margin:1.5rem 0 0;padding:0;display:grid;
  gap:1.15rem 3rem;grid-template-columns:repeat(auto-fit,minmax(19rem,1fr));max-width:60rem}
.limits li{position:relative;padding-left:2rem;max-width:34rem}
.limits li::before{content:"—";position:absolute;left:0;top:0;color:var(--accent);
  font-family:"SF Mono","Cascadia Mono",Consolas,monospace}
.limits li b{font-weight:600}

/* ---- case figure ---- */
.figure{margin:2rem 0 0;padding:1.6rem 0;border-top:3px double var(--rule-strong);border-bottom:1px solid var(--rule);max-width:44rem}
.figure .amt{font-family:"Iowan Old Style",Palatino,Georgia,serif;font-size:clamp(2rem,5vw,2.8rem);color:var(--accent);line-height:1;letter-spacing:-.02em}
.figure .cap{display:block;margin-top:.6rem;font-size:.9rem;color:var(--slate);max-width:36rem}

/* ---- faq ---- */
.faq{margin-top:1.5rem;border-top:1px solid var(--rule)}
.faq details{border-bottom:1px solid var(--rule)}
.faq summary{cursor:pointer;padding:1.1rem 0;font-family:"Iowan Old Style",Palatino,Georgia,serif;font-size:1.08rem;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--accent);margin-right:.7rem;font-family:"SF Mono",Consolas,monospace}
.faq details[open] summary::before{content:"–"}
.faq details>p{margin:0 0 1.2rem;color:var(--slate)}

/* ---- waitlist ---- */
.signup{max-width:34rem;margin-top:1.5rem}
.signup label{display:block;font-size:.86rem;color:var(--slate);margin-bottom:.35rem}
.signup input{width:100%;padding:.75rem .85rem;font-size:1rem;font-family:inherit;color:var(--ink);
  background:var(--paper);border:1px solid var(--slate);border-radius:2px;margin-bottom:1rem}
.signup button{background:var(--ink);color:var(--paper);border:0;padding:.8rem 1.5rem;font-size:.95rem;
  font-family:inherit;font-weight:600;border-radius:2px;cursor:pointer}
.signup button:hover{background:var(--accent)}
.signup .fine{font-size:.82rem;color:var(--slate);margin-top:.8rem}
/* Honeypot: off-screen for people, fillable by bots. Not display:none — some bots skip that. */
.signup .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* ---- footer ---- */
footer{padding:2.5rem 0 4rem;font-size:.88rem;color:var(--slate)}
footer .cols{display:flex;flex-wrap:wrap;gap:2rem 4rem;margin-bottom:2rem}
footer a{color:var(--slate)}
footer .legal{max-width:46rem;line-height:1.6}

@media (max-width:640px){
  body{font-size:16px}
  .hero{padding:3rem 0 2.2rem}
  section{padding:2.6rem 0}
  .row{grid-template-columns:1fr;gap:.4rem}
  .row .k{padding-top:0}
  .nav ul{margin-left:0;gap:1.1rem}
}