:root{
  --bks-wood:#1b1410;
  --bks-wood-2:#241a14;
  --bks-plank:#2e2119;
  --bks-paper:#f1e6cc;
  --bks-paper-2:#e7d8b6;
  --bks-ink:#2a1c13;
  --bks-ink-soft:#57432f;
  --bks-acc:#c9a227;
  --bks-acc-hi:#e0bb45;
  --bks-acc2:#7a2e2e;
  --bks-acc2-hi:#963b3b;
  --bks-cream:#efe3c6;
  --bks-line:rgba(42,28,19,.18);
  --bks-radius:6px;
  --bks-display:"Prata",Georgia,"Times New Roman",serif;
  --bks-body:"Scada","Trebuchet MS",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body.bks-body{
  margin:0;
  background-color:var(--bks-wood);
  background-image:
    repeating-linear-gradient(90deg,rgba(255,255,255,.012) 0 2px,transparent 2px 9px),
    linear-gradient(180deg,#221913 0%,var(--bks-wood) 40%,#160f0b 100%);
  color:var(--bks-cream);
  font:400 16px/1.6 var(--bks-body);
  overflow-x:hidden;
}
a{color:inherit}
img,svg{max-width:100%}

/* ---------- header: shelf with spines ---------- */
.bks-top{
  position:sticky;top:0;z-index:20;
  background:linear-gradient(180deg,#2a1e16,#1e1611);
  border-bottom:6px solid #3a2a1e;
  box-shadow:0 6px 0 #140e0a,0 10px 18px rgba(0,0,0,.45);
}
.bks-top-in{
  max-width:1180px;margin:0 auto;
  display:flex;align-items:center;gap:12px;
  padding:8px 16px;
}
.bks-mark{display:flex;align-items:center;gap:8px;text-decoration:none;flex:0 0 auto}
.bks-mark-svg{display:block;width:40px;height:40px}
.bks-mark-word{font:400 22px/1 var(--bks-display);color:var(--bks-acc);letter-spacing:.02em;display:flex;align-items:baseline;gap:5px}
.bks-mark-sub{font:700 11px/1 var(--bks-body);color:var(--bks-cream);letter-spacing:.2em;text-transform:uppercase}
.bks-spines{display:none}
.bks-top-cta{
  margin-left:auto;
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:0 18px;
  background:var(--bks-acc);color:#1b1208;
  font:700 15px/1 var(--bks-body);letter-spacing:.04em;text-transform:uppercase;
  text-decoration:none;border-radius:var(--bks-radius);
  box-shadow:inset 0 -3px 0 rgba(0,0,0,.2);
}
.bks-top-cta:hover{background:var(--bks-acc-hi)}

/* ---------- hero: open book ---------- */
.bks-main{max-width:1180px;margin:0 auto;padding:14px 12px 40px}
.bks-open{margin:0 0 34px}
.bks-open-book{
  position:relative;
  display:grid;grid-template-columns:1fr;
  background:var(--bks-paper);
  color:var(--bks-ink);
  border-radius:4px;
  box-shadow:0 0 0 5px var(--bks-acc2),0 0 0 7px #4a1b1b,0 18px 30px rgba(0,0,0,.55);
}
.bks-leaf{position:relative;padding:22px 18px 20px}
.bks-leaf--recto{border-top:1px dashed var(--bks-line);background:var(--bks-paper-2)}
.bks-ribbon{
  position:absolute;top:-7px;right:22px;width:16px;height:46px;
  clip-path:polygon(0 0,100% 0,100% 100%,50% 78%,0 100%);
}
.bks-ribbon--gold{background:var(--bks-acc)}
.bks-ribbon--wine{background:var(--bks-acc2)}
.bks-leaf--recto .bks-ribbon{right:48px}
.bks-folio{
  margin:0 0 8px;
  font:400 12px/1.3 var(--bks-body);letter-spacing:.16em;text-transform:uppercase;
  color:var(--bks-acc2);
}
.bks-title{
  margin:0 0 10px;padding-right:22px;
  font:400 clamp(23px,6vw,40px)/1.2 var(--bks-display);
  color:var(--bks-ink);
}
.bks-lead{margin:0 0 16px;font-size:16px;line-height:1.55;color:var(--bks-ink-soft)}
.bks-cta-row{display:flex;flex-wrap:wrap;gap:10px}
.bks-cta{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:50px;padding:0 22px;flex:1 1 220px;
  background:var(--bks-acc);color:#1b1208;
  font:700 16px/1.2 var(--bks-body);text-align:center;text-decoration:none;
  border-radius:var(--bks-radius);
  box-shadow:0 0 0 2px #8f7117 inset,0 4px 0 #7e6214;
}
.bks-cta:hover{background:var(--bks-acc-hi)}
.bks-cta-ghost{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 18px;flex:1 1 180px;
  color:var(--bks-acc2);font:700 15px/1.2 var(--bks-body);text-align:center;text-decoration:none;
  border:2px solid var(--bks-acc2);border-radius:var(--bks-radius);
}
.bks-cta-ghost:hover{background:rgba(122,46,46,.08)}

.bks-slips{list-style:none;margin:0 0 16px;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.bks-slip{margin:0}
.bks-slip-a{
  display:flex;flex-direction:column;gap:3px;height:100%;min-height:44px;
  padding:10px 10px 11px;
  background:#fbf5e6;border:1px solid var(--bks-line);border-left:4px solid var(--bks-acc2);
  border-radius:3px;text-decoration:none;color:var(--bks-ink);
}
.bks-slip:nth-child(2n) .bks-slip-a{border-left-color:var(--bks-acc)}
.bks-slip-a:hover{background:#fffaf0}
.bks-slip-n{font:400 12px/1 var(--bks-display);color:var(--bks-acc2)}
.bks-slip-t{font:700 15px/1.2 var(--bks-body)}
.bks-slip-d{font-size:13px;line-height:1.35;color:var(--bks-ink-soft)}
.bks-colophon{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--bks-line);border:1px solid var(--bks-line)}
.bks-colophon-i{background:var(--bks-paper-2);padding:8px 10px}
.bks-colophon dt{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--bks-ink-soft)}
.bks-colophon dd{margin:2px 0 0;font:400 20px/1.2 var(--bks-display);color:var(--bks-acc2)}

/* ---------- volumes (sections) ---------- */
.bks-vol{display:grid;grid-template-columns:minmax(0,1fr);margin:0 0 30px;scroll-margin-top:80px}
.bks-vol-spine{
  display:flex;align-items:center;gap:12px;
  padding:9px 16px;
  background:linear-gradient(90deg,#3b2a1d,#4b3624 50%,#3b2a1d);
  border-radius:4px 4px 0 0;
  box-shadow:inset 0 3px 0 var(--bks-acc),inset 0 -3px 0 var(--bks-acc);
  color:var(--bks-acc);
}
.bks-vol-spine--wine{background:linear-gradient(90deg,#5e2222,var(--bks-acc2) 50%,#5e2222)}
.bks-vol-spine--cream{background:linear-gradient(90deg,#d9c79f,var(--bks-cream) 50%,#d9c79f);color:var(--bks-acc2);box-shadow:inset 0 3px 0 var(--bks-acc2),inset 0 -3px 0 var(--bks-acc2)}
.bks-vol-num{font:400 20px/1 var(--bks-display)}
.bks-vol-lbl{font:700 12px/1 var(--bks-body);letter-spacing:.24em;text-transform:uppercase}
.bks-spread{
  position:relative;
  background:var(--bks-paper);color:var(--bks-ink);
  padding:22px 18px 22px;
  border-radius:0 0 4px 4px;
  box-shadow:0 14px 24px rgba(0,0,0,.45);
}
.bks-ribbon--edge{top:-4px;right:18px;height:40px}
.bks-h2{
  margin:0 0 12px;padding-right:26px;
  font:400 clamp(21px,5.2vw,31px)/1.25 var(--bks-display);
  color:var(--bks-ink);
}
.bks-h3{margin:18px 0 6px;font:700 18px/1.3 var(--bks-body);color:var(--bks-acc2)}
.bks-intro{margin:0 0 12px;font-size:17px;line-height:1.55;color:var(--bks-ink);font-style:italic}
.bks-txt{margin:0 0 10px;color:var(--bks-ink-soft)}
.bks-pages{display:grid;grid-template-columns:1fr;gap:0}
.bks-page{min-width:0}
.bks-spread{min-width:0}
.bks-inline-cta{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;margin-top:8px;padding:0 20px;
  background:var(--bks-acc);color:#1b1208;
  font:700 15px/1.2 var(--bks-body);text-align:center;text-decoration:none;
  border-radius:var(--bks-radius);box-shadow:0 3px 0 #7e6214;
}
.bks-inline-cta:hover{background:var(--bks-acc-hi)}
.bks-inline-cta--wide{display:flex;margin-top:18px}

/* chapters of the package */
.bks-chapters{list-style:none;margin:6px 0 8px;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:8px;counter-reset:none}
.bks-chapter{
  display:flex;flex-direction:column;gap:2px;
  padding:10px 8px 12px;text-align:center;
  background:#fbf5e6;border:1px solid var(--bks-line);border-top:5px solid var(--bks-acc);
}
.bks-chapter:nth-child(2){border-top-color:var(--bks-acc2)}
.bks-chapter:nth-child(3){border-top-color:#8a7a5c}
.bks-chapter-k{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--bks-ink-soft)}
.bks-chapter-v{font:400 26px/1.1 var(--bks-display);color:var(--bks-acc2)}
.bks-chapter-s{font-size:12px;line-height:1.3;color:var(--bks-ink-soft)}

/* ledgers (tables) */
.bks-ledger-wrap{margin:8px 0 6px;overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--bks-line);background:#fbf5e6}
.bks-ledger{width:100%;min-width:860px;border-collapse:collapse;font-size:14px}
.bks-ledger--pay{min-width:0}
.bks-ledger th{
  text-align:left;padding:9px 10px;
  background:var(--bks-acc2);color:var(--bks-cream);
  font:700 12px/1.2 var(--bks-body);letter-spacing:.08em;text-transform:uppercase;white-space:nowrap;
}
.bks-ledger td:nth-child(3),.bks-ledger td:last-child{white-space:nowrap}
.bks-ledger td{padding:8px 10px;border-top:1px solid var(--bks-line);vertical-align:top;color:var(--bks-ink)}
.bks-ledger td:first-child{font-weight:700;white-space:nowrap}
.bks-ledger tbody tr:nth-child(even) td{background:rgba(201,162,39,.08)}

/* VIP shelf of tomes */
.bks-shelf{
  list-style:none;margin:18px 0 0;padding:0 6px;
  display:flex;align-items:flex-end;gap:5px;
  border-bottom:8px solid #5a4030;
  box-shadow:0 6px 0 #3a2a1e;
}
.bks-tome{
  flex:1 1 0;min-width:0;
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:8px 2px 10px;border-radius:3px 3px 0 0;
  color:var(--bks-cream);
  box-shadow:inset 0 5px 0 rgba(201,162,39,.8),inset 0 -5px 0 rgba(201,162,39,.8);
}
.bks-tome--1{height:120px;background:#6a4a33}
.bks-tome--2{height:138px;background:#5b3322}
.bks-tome--3{height:156px;background:#7a2e2e}
.bks-tome--4{height:174px;background:#4d2a36}
.bks-tome--5{height:192px;background:#3a3325}
.bks-tome--6{height:212px;background:#2b1d14;box-shadow:inset 0 5px 0 var(--bks-acc),inset 0 -5px 0 var(--bks-acc),0 0 0 2px var(--bks-acc)}
.bks-tome-pct{font:400 15px/1 var(--bks-display);color:var(--bks-acc-hi)}
.bks-tome-name{writing-mode:vertical-rl;transform:rotate(180deg);font:700 13px/1 var(--bks-body);letter-spacing:.06em;white-space:nowrap}

/* 18+ seal */
.bks-seal{
  display:flex;gap:12px;align-items:flex-start;
  margin-top:14px;padding:12px;
  background:#fbf5e6;border:1px solid var(--bks-line);border-left:4px solid var(--bks-acc2);
}
.bks-seal-badge{
  flex:0 0 auto;display:flex;align-items:center;justify-content:center;
  width:48px;height:48px;border-radius:50%;
  background:var(--bks-acc2);color:var(--bks-cream);
  font:400 16px/1 var(--bks-display);box-shadow:0 0 0 3px var(--bks-acc);
}
.bks-seal-txt{margin:0;font-size:14px;line-height:1.5;color:var(--bks-ink)}

/* FAQ as index cards */
.bks-index{display:grid;grid-template-columns:1fr;gap:8px}
.bks-card{
  background:#fbf5e6;border:1px solid var(--bks-line);border-top:3px solid var(--bks-acc);
  border-radius:2px;
}
.bks-card:nth-child(3n+2){border-top-color:var(--bks-acc2)}
.bks-card-q{
  cursor:pointer;list-style:none;
  display:flex;align-items:center;min-height:48px;padding:10px 40px 10px 12px;position:relative;
  font:700 16px/1.35 var(--bks-body);color:var(--bks-ink);
}
.bks-card-q::-webkit-details-marker{display:none}
.bks-card-q::after{
  content:"+";position:absolute;right:12px;top:50%;transform:translateY(-50%);
  font:400 22px/1 var(--bks-display);color:var(--bks-acc2);
}
.bks-card[open] .bks-card-q::after{content:"–"}
.bks-card-a{margin:0;padding:0 12px 12px;color:var(--bks-ink-soft)}

/* author note + footer */
.bks-afterword{margin:10px 0 0}
.bks-afterword-in{
  padding:20px 18px;border:1px solid rgba(201,162,39,.45);border-radius:4px;
  background:rgba(239,227,198,.05);
}
.bks-h2--note{color:var(--bks-acc);font-size:clamp(19px,4.6vw,25px)}
.bks-afterword .bks-txt{color:#dccfb2}
.bks-foot{border-top:6px solid #3a2a1e;background:#140e0a;margin-top:20px}
.bks-foot-in{max-width:1180px;margin:0 auto;padding:22px 16px 30px}
.bks-foot-brand{margin:0 0 8px;font:400 20px/1.2 var(--bks-display);color:var(--bks-acc)}
.bks-foot-legal{margin:0 0 6px;font-size:13px;line-height:1.5;color:#bfb196}

/* ---------- wider screens ---------- */
@media (min-width:720px){
  .bks-main{padding:26px 20px 56px}
  .bks-slips{grid-template-columns:1fr 1fr}
  .bks-colophon{grid-template-columns:repeat(4,1fr)}
  .bks-pages{grid-template-columns:1fr 1fr;gap:0 44px;position:relative}
  .bks-pages::before{
    content:"";position:absolute;top:0;bottom:0;left:50%;width:2px;margin-left:-1px;
    background:linear-gradient(180deg,transparent,rgba(42,28,19,.22) 12%,rgba(42,28,19,.22) 88%,transparent);
  }
  .bks-index{grid-template-columns:1fr 1fr;align-items:start}
  .bks-spread{padding:28px 32px 30px}
  .bks-tome{padding:10px 4px 12px}
  .bks-tome-name{font-size:15px}
}
@media (min-width:980px){
  .bks-spines{
    display:flex;align-items:flex-end;gap:4px;height:58px;margin-left:18px;
  }
  .bks-spine-link{
    display:flex;align-items:center;justify-content:center;
    width:40px;min-height:44px;
    writing-mode:vertical-rl;transform:rotate(180deg);
    font:700 11px/1 var(--bks-body);letter-spacing:.12em;text-transform:uppercase;
    text-decoration:none;color:var(--bks-cream);
    border-radius:3px 3px 0 0;
    box-shadow:inset 0 3px 0 rgba(201,162,39,.7),inset 0 -3px 0 rgba(201,162,39,.7);
  }
  .bks-spine-link--a{height:50px;background:#6a4a33}
  .bks-spine-link--b{height:58px;background:var(--bks-acc2)}
  .bks-spine-link--c{height:46px;background:#4d2a36}
  .bks-spine-link--d{height:56px;background:#5b3322}
  .bks-spine-link--e{height:56px;background:#3a3325}
  .bks-spine-link--f{height:48px;background:#7a5a2e}
  .bks-spine-link--g{height:58px;background:#4b3624}
  .bks-spine-link--h{height:58px;background:#6a2a2a}
  .bks-spine-link:hover{color:var(--bks-acc-hi)}
  .bks-top-cta{min-height:46px;padding:0 24px}

  .bks-open-book{grid-template-columns:1.1fr 1fr}
  .bks-open-book::after{
    content:"";position:absolute;top:0;bottom:0;left:52.4%;width:34px;margin-left:-17px;pointer-events:none;
    background:linear-gradient(90deg,transparent,rgba(42,28,19,.18) 45%,rgba(42,28,19,.28) 50%,rgba(42,28,19,.18) 55%,transparent);
  }
  .bks-leaf{padding:40px 44px 36px}
  .bks-leaf--recto{border-top:0}
  .bks-lead{font-size:18px}

  .bks-vol{grid-template-columns:74px minmax(0,1fr);gap:0;align-items:start}
  .bks-vol-spine{
    flex-direction:column;justify-content:flex-start;gap:16px;
    padding:18px 0;border-radius:4px 0 0 4px;
    box-shadow:inset 0 5px 0 var(--bks-acc),inset 0 -5px 0 var(--bks-acc),inset -6px 0 10px rgba(0,0,0,.35);
    position:sticky;top:96px;
  }
  .bks-vol-spine--cream{box-shadow:inset 0 5px 0 var(--bks-acc2),inset 0 -5px 0 var(--bks-acc2),inset -6px 0 10px rgba(0,0,0,.18)}
  .bks-vol-lbl{writing-mode:vertical-rl;transform:rotate(180deg);font-size:13px}
  .bks-vol--tall .bks-vol-spine{height:360px;margin-top:0}
  .bks-vol--mid .bks-vol-spine{height:300px;margin-top:30px}
  .bks-vol--short .bks-vol-spine{height:250px;margin-top:60px}
  .bks-spread{border-radius:0 4px 4px 0;padding:34px 44px 36px}
  .bks-ribbon--edge{right:40px;height:54px}
  .bks-shelf{max-width:640px}
  .bks-afterword-in{padding:28px 44px;margin-left:74px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.bks-ledger--pay th,.bks-ledger--pay td:first-child{white-space:normal}