/* puzzlecrownbooks.com: the "Value Bumper" look. Font: Rubik (SIL OFL 1.1, self-hosted, see fonts/OFL-Rubik.txt). */
@font-face{font-family:"Rubik";font-weight:400;font-display:swap;src:url(/assets/fonts/rubik-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Rubik";font-weight:500;font-display:swap;src:url(/assets/fonts/rubik-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Rubik";font-weight:700;font-display:swap;src:url(/assets/fonts/rubik-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Rubik";font-weight:800;font-display:swap;src:url(/assets/fonts/rubik-latin-800-normal.woff2) format("woff2")}
@font-face{font-family:"Rubik";font-weight:900;font-display:swap;src:url(/assets/fonts/rubik-latin-900-normal.woff2) format("woff2")}

:root{
  --yellow:#FFD600; --red:#E53935; --red-dark:#B71C1C; --blue:#1E4FD8; --blue-dark:#163CA8; --ink:#111827; --ink-2:#374151;
  --easy:#2BB673; --med:#FFB300; --hard:#E8453C;
  --easy-t:#0F7A43; --med-t:#8A5200; --hard-t:#B3241D;
  --white:#fff; --cream:#FFF8D6; --line:#D1D5DB; --paper-2:#F3F4F6;
  --accent:#FFD600; --radius:12px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--white);color:var(--ink);font:400 19px/1.6 "Rubik",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;overflow-wrap:break-word}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue-dark);text-underline-offset:3px}
a:hover{color:var(--ink)}
:focus-visible{outline:4px solid var(--blue);outline-offset:3px}
h1,h2,h3{font-weight:900;line-height:1.1;letter-spacing:-.01em;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(2.1rem,6.5vw,3.6rem)}
h2{font-size:clamp(1.6rem,4.4vw,2.3rem)}
h3{font-size:1.3rem}
p{margin:0 0 1em}
ul,ol{padding-left:1.3em}
.wrap{max-width:1120px;margin:0 auto;padding:0 max(16px,env(safe-area-inset-left))}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:var(--ink);color:#fff;padding:8px 12px;z-index:9}
.small{font-size:.86rem;color:var(--ink-2)}
.sub{color:var(--ink-2);max-width:62ch;font-size:1.05rem}
.kicker{font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.85rem;margin-bottom:.6em}
.lead{font-size:clamp(1.15rem,2.6vw,1.35rem);line-height:1.5;max-width:60ch}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* buttons: big tap targets */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:54px;background:var(--blue);color:#fff;font-weight:800;font-size:1.05rem;text-decoration:none;padding:.6em 1.3em;border:3px solid var(--blue);border-radius:999px;margin:0 .4em .6em 0;box-shadow:0 4px 0 var(--ink);transition:transform .1s,box-shadow .1s}
.btn:hover,.btn:focus{background:var(--blue-dark);border-color:var(--blue-dark);color:#fff}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 var(--ink)}
.btn-ghost{background:var(--white);color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover,.btn-ghost:focus{background:var(--cream);color:var(--ink);border-color:var(--ink)}
.btn[aria-disabled=true]{background:var(--paper-2);color:var(--ink-2);border-color:var(--line);box-shadow:none;pointer-events:none}

/* header: the red band with the crown masthead */
.top{background:var(--red);color:#fff;border-bottom:5px solid var(--ink)}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:10px 24px;flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;min-height:48px}
.brand:hover{color:#fff}
.brand .crown{width:54px;height:auto;flex:none}
.brand span{font-weight:900;font-size:clamp(1.55rem,5vw,2rem);line-height:1;text-transform:uppercase;letter-spacing:-.01em;white-space:nowrap}
.nav{display:flex;flex-wrap:wrap;gap:4px 6px}
.nav a{color:#fff;font-weight:800;font-size:1.1rem;text-decoration:none;padding:10px 14px;border-radius:999px;min-height:48px;display:flex;align-items:center}
.nav a:hover,.nav a:focus{background:var(--red-dark);color:#fff}
.nav a[aria-current=page]{background:var(--yellow);color:var(--ink)}
@media (max-width:760px){
  .top-in{justify-content:center}
  .nav{justify-content:center;gap:4px}
  .nav a{font-size:1rem;padding:8px 12px}
}

/* sections */
.section{padding:56px 0}
.section.yellow{background:var(--yellow)}
.section.cream{background:var(--cream)}
.section.blue{background:var(--blue);color:#fff}
.section.blue a{color:#fff}
.split{display:grid;gap:32px;align-items:center}
@media (min-width:860px){.split{grid-template-columns:1fr 1fr}}

/* hero */
.hero{background:var(--yellow);padding:44px 0 56px;overflow:hidden}
.hero-in{display:grid;gap:32px;align-items:center}
@media (min-width:860px){.hero-in{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr)}}
.hero h1 .blue{color:var(--blue)}
.hero .cover{max-width:360px;margin:0 auto;transform:rotate(2deg)}
@media (max-width:600px){.hero .cover{max-width:290px}.trio{display:none!important}}
.promise{display:inline-block;background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);padding:10px 16px;font-weight:700;font-size:1.1rem;margin:0 0 1.2em;box-shadow:5px 5px 0 var(--ink)}
.cta{margin-top:.4em}

/* facts strip */
.facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;padding:28px 0}
@media (min-width:860px){.facts{grid-template-columns:repeat(4,minmax(0,1fr))}}
.facts div{display:flex;flex-direction:column;gap:4px}
.facts b{font-weight:900;font-size:1.35rem;line-height:1.15}
.facts span{font-size:1rem;opacity:.95}

/* levels */
.lv-grid{display:grid;gap:20px;margin-top:20px}
@media (min-width:860px){.lv-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.lv{background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.lv-h{padding:12px 18px;font-weight:900;font-size:1.6rem;text-transform:uppercase;letter-spacing:.02em;color:var(--ink)}
.lv-b{padding:16px 18px 18px}
.lv-b p:last-child{margin-bottom:0}
.b-easy{background:var(--easy)}
.b-medium{background:var(--med)}
.b-hard{background:var(--hard)}
.ladder{display:flex;border:3px solid var(--ink);border-radius:var(--radius);overflow:hidden;margin:20px 0 10px;font-weight:900;text-align:center}
.ladder span{flex:1;padding:12px 4px;color:var(--ink);font-size:1.1rem}
.ladder-note{font-size:1rem;color:var(--ink-2)}
.lv-detail{border-left:12px solid var(--c);padding:6px 0 6px 20px;margin:36px 0}
.lv-detail h2,.prose .lv-detail h2{color:var(--t);font-size:clamp(1.9rem,5.5vw,2.5rem);margin-top:0}
.lv-detail ul{margin:0 0 1em}
.lv-detail li{margin-bottom:.4em}

/* chips */
.chips{display:inline-flex;gap:4px;vertical-align:middle}
.chip{display:inline-block;font-size:.78rem;font-weight:800;text-transform:uppercase;padding:2px 9px;border-radius:999px;color:var(--ink);border:2px solid var(--ink)}

/* book cards */
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin-top:20px}
@media (min-width:860px){.cards{grid-template-columns:repeat(4,minmax(0,1fr))}}
.card{display:flex;flex-direction:column;gap:6px;color:var(--ink);text-decoration:none;background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);padding:12px}
.card:hover,.card:focus{box-shadow:6px 6px 0 var(--ink);color:var(--ink)}
.card-t{font-weight:900;font-size:1.1rem;line-height:1.2;margin-top:6px}
.card-e{font-size:.9rem;color:var(--ink-2)}
.card-l{font-size:.9rem;font-weight:700;display:flex;flex-wrap:wrap;align-items:center;gap:4px 6px}
.chips{flex-wrap:wrap}
.card-s{font-size:.92rem;font-weight:700;color:var(--blue-dark)}
.cover-img img{border-radius:4px;box-shadow:0 2px 8px rgba(0,0,0,.2)}

/* the empty-catalogue panel */
.soon-panel{display:flex;gap:24px;align-items:flex-start;background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);padding:24px;margin-top:20px;box-shadow:8px 8px 0 var(--ink)}
.soon-panel .crown.big{width:96px;height:auto;flex:none}
.soon-panel h3{font-size:clamp(1.4rem,4vw,1.9rem)}
.soon-panel .signup{margin:16px 0 0;border:0;padding:0;max-width:none}
.soon-panel .signup-h{display:none}
@media (max-width:600px){.soon-panel{flex-direction:column;gap:10px;padding:18px}.soon-panel .crown.big{width:72px}}

/* free puzzles */
.pdf-list{list-style:none;padding:0;margin:20px 0;display:grid;gap:14px}
.pdf-list li{background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);padding:16px 18px;display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;justify-content:space-between}
.pdf-list .t{font-weight:800;font-size:1.15rem}
.pdf-list .btn{margin:0}
.empty{background:var(--cream);border:3px dashed var(--ink);border-radius:var(--radius);padding:24px;margin:20px 0}
.empty h2{font-size:clamp(1.3rem,4vw,1.8rem)}

/* walkthrough explainer list */
.steps-demo{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.steps-demo li{background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);padding:14px 16px;font-size:1.02rem}
.steps-demo b{display:block;font-weight:900;color:var(--blue-dark)}

/* prose pages */
.prose{max-width:780px;padding-top:40px;padding-bottom:56px}
.prose h2{margin-top:1.4em;font-size:clamp(1.4rem,4vw,1.9rem)}
.ticks{list-style:none;padding:0;margin:0 0 1.2em}
.ticks li{position:relative;padding-left:1.8em;margin-bottom:.5em}
.ticks li::before{content:"";position:absolute;left:0;top:.35em;width:1.05em;height:1.05em;border-radius:50%;background:var(--easy) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3.5 8.5l3 3 6-7' fill='none' stroke='%23111827' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/80% no-repeat}
.note{background:var(--cream);border-left:8px solid var(--yellow);padding:12px 16px;border-radius:4px}
.callout{background:var(--ink);color:#fff;border-radius:var(--radius);padding:22px 24px;margin:32px 0}
.callout a{color:var(--yellow);font-weight:700}
.callout h2{margin-top:0;color:var(--yellow)}

/* book page */
.book{display:grid;gap:32px;padding-top:36px;padding-bottom:48px}
@media (min-width:860px){.book{grid-template-columns:360px 1fr;align-items:start}}
.book-cover{max-width:360px;width:100%;margin:0 auto}
.book h1{font-size:clamp(1.9rem,5.5vw,3rem)}
.book .ed{font-weight:700;color:var(--ink-2);margin-top:-.4em}
.book .strap{font-weight:800;font-size:1.25rem}
.meta{display:grid;grid-template-columns:max-content 1fr;gap:6px 18px;margin:0 0 20px}
.meta dt{font-weight:800}
.meta dd{margin:0}
.buy{margin:8px 0 4px}
.stores{margin:.2em 0 .6em;font-size:1rem}
.stores summary{cursor:pointer;text-decoration:underline;min-height:44px;display:flex;align-items:center}
.stores ul{margin:.4em 0 0;padding-left:1.2em;columns:2}
.stores li{margin-bottom:.4em}
.sample{margin:.6em 0 0;font-weight:700}
.book .note{margin-top:18px}

/* footer */
.foot{background:var(--ink);color:#fff;padding:40px 0 32px;border-top:6px solid var(--red)}
.foot-in{display:grid;gap:20px}
.foot a{color:#fff}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.4rem;margin-bottom:.3em}
.foot-brand .crown{width:44px;height:auto}
.foot nav{display:flex;flex-wrap:wrap;gap:4px 8px}
.foot nav a{padding:10px 10px;min-height:44px;display:inline-flex;align-items:center;font-weight:600}
.foot .small{color:#D1D5DB}

/* ---------- mock cover (Value Bumper, sized in container units like branding/options) ---------- */
.cover{container-type:inline-size;aspect-ratio:6/9;width:100%;border-radius:4px;overflow:hidden;box-shadow:0 2px 3px rgba(0,0,0,.2),0 10px 24px rgba(0,0,0,.18)}
.cv{height:100%;background:#FFD600;color:#111827;font-family:"Rubik",system-ui,sans-serif;display:flex;flex-direction:column;line-height:1.2}
.cv-top{background:#E53935;color:#fff;padding:2cqw 4cqw;display:flex;justify-content:space-between;align-items:center;gap:3cqw}
.cv .mast{display:flex;align-items:center;gap:2cqw;min-width:0}
.cv .mast svg{width:9.5cqw;height:auto;flex:none}
.cv .mast b{font-weight:900;font-size:7.4cqw;line-height:1;letter-spacing:-.01em;text-transform:uppercase;white-space:nowrap}
.cv .lp{font-weight:800;font-size:4.8cqw;line-height:1;text-align:right;text-transform:uppercase}
.cv-head{position:relative;z-index:1;padding:0 4cqw;margin-block:auto;display:flex;align-items:center;gap:2.6cqw}
.cv .n{font-weight:900;font-size:17cqw;line-height:.72;color:#1E4FD8;letter-spacing:-.03em;padding-top:.4cqw}
.cv .t{font-weight:900;font-size:6.6cqw;line-height:.9;text-transform:uppercase;display:flex;flex-direction:column;justify-content:center}
.cv .burst{position:absolute;right:1.5cqw;top:.5cqw;width:30cqw;aspect-ratio:1;background:#1E4FD8;color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;font-weight:900;font-size:6.4cqw;line-height:.95;transform:rotate(8deg);filter:drop-shadow(0 .6cqw 0 rgba(0,0,0,.25));
  clip-path:polygon(50% 0,61% 13%,77% 6%,79% 23%,95% 25%,88% 40%,100% 50%,88% 60%,95% 75%,79% 77%,77% 94%,61% 87%,50% 100%,39% 87%,23% 94%,21% 77%,5% 75%,12% 60%,0 50%,12% 40%,5% 25%,21% 23%,23% 6%,39% 13%)}
.cv-grid{width:88cqw;aspect-ratio:1;margin:0 auto 5cqw;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);background:#fff;border:.9cqw solid #111827;color:#111}
.cv-grid span{display:flex;align-items:center;justify-content:center;font-weight:700;font-size:6.2cqw;line-height:1;border-right:.25cqw solid #b9c0cc;border-bottom:.25cqw solid #b9c0cc;min-width:0;min-height:0}
.cv-grid span:nth-child(3n){border-right:.7cqw solid #111827}
.cv-grid span:nth-child(n+19):nth-child(-n+27),.cv-grid span:nth-child(n+46):nth-child(-n+54){border-bottom:.7cqw solid #111827}
.cv-grid span:nth-child(9n){border-right:0}
.cv-grid span:nth-child(n+73){border-bottom:0}
.cv-grid.ws span,.cv-grid.ws span:nth-child(3n),.cv-grid.ws span:nth-child(n){border:0;font-size:5.6cqw}
.cv-bar{display:flex;font-weight:900;font-size:4.6cqw;text-align:center;line-height:1}
.cv-bar span{flex:1;color:#fff;padding:1.6cqw 0}
.cv-bar .b-easy{background:#2BB673}.cv-bar .b-medium{background:#FFB300;color:#222}.cv-bar .b-hard{background:#E8453C}
.cv-by{font-weight:800;font-size:2.8cqw;text-align:center;padding:1cqw 0 1.2cqw;letter-spacing:.06em}

/* ---------- walkthrough player (classes used by assets/walkthrough.js) ---------- */
.wt{padding-top:32px;padding-bottom:48px}
.wt-head h1{font-size:clamp(1.8rem,5.5vw,2.8rem);margin-bottom:.2em}
.wt-head p{color:var(--ink-2);margin-bottom:16px}
.wt-body{display:grid;gap:20px}
@media (min-width:860px){.wt-body{grid-template-columns:minmax(0,540px) 1fr;align-items:start}}
.board{position:relative;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,minmax(0,1fr));aspect-ratio:1;width:100%;max-width:540px;border:4px solid var(--ink);background:var(--white);user-select:none}
.cell{position:relative;min-width:0;min-height:0;overflow:hidden;border-right:1px solid #b9c0cc;border-bottom:1px solid #b9c0cc;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:clamp(1.1rem,5.6vw,1.9rem);transition:background .25s}
.cell.c2,.cell.c5{border-right:3px solid var(--ink)}
.cell.c8{border-right:0}
.cell.r2,.cell.r5{border-bottom:3px solid var(--ink)}
.cell.r8{border-bottom:0}
.cell.given{color:var(--ink)}
.cell.solved{color:var(--blue)}
.cell.unit{background:#FFF3B0}
.cell.pat{background:#FFE066}
.cell.focus{background:var(--yellow)}
.cell.focus.solved{color:var(--ink)}
.cell.elimc{background:#FDE2E1}
.cands{position:absolute;inset:0;display:grid;grid-template-columns:repeat(3,1fr);font-size:clamp(.5rem,2.1vw,.78rem);font-weight:500;color:#6B7280;padding:1px}
.cands span{display:flex;align-items:center;justify-content:center}
.cands span.gone{color:#C62828;text-decoration:line-through;font-weight:900}
.cands span.keep{color:var(--ink);font-weight:900}
.panel{background:var(--white);border:3px solid var(--ink);border-radius:var(--radius);padding:18px}
.panel .count{font-size:.85rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2)}
.panel h2{font-size:1.5rem;margin:.2em 0 .4em}
.panel .tier{display:inline-block;font-size:.75rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:2px 10px;border-radius:999px;background:var(--paper-2);margin-left:6px;vertical-align:middle}
.panel .tier.basic{background:var(--easy)}
.panel .tier.intermediate{background:var(--med)}
.panel .tier.advanced,.panel .tier.expert{background:var(--hard)}
.panel .what{font-size:1.1rem}
.panel .why{color:var(--ink-2);font-size:1rem}
.controls{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 6px}
.controls button{font:inherit;font-weight:800;background:var(--blue);color:#fff;border:3px solid var(--blue);border-radius:999px;padding:.5em 1.1em;cursor:pointer;min-width:52px;min-height:52px}
.controls button.ghost{background:var(--white);color:var(--ink);border-color:var(--ink)}
.controls button:disabled{opacity:.4;cursor:default}
.progress{height:8px;background:var(--paper-2);border-radius:4px;overflow:hidden;margin-top:8px}
.progress i{display:block;height:100%;background:var(--blue);width:0;transition:width .2s}
.wt-foot{margin-top:16px;font-size:.95rem;color:var(--ink-2)}
.toggle{font-size:1rem;display:flex;align-items:center;gap:8px;margin-top:6px;min-height:44px}
.toggle input{width:22px;height:22px}
.board.killer .cands{grid-template-rows:repeat(3,1fr);padding:35% 13% 13% 17%;font-size:clamp(.36rem,1.5vw,.58rem);line-height:1}
.board .cages{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.cage-line{fill:none;stroke:#444;stroke-width:.03;stroke-dasharray:.09 .06}
.cage-sum{font-size:.24px;font-weight:700;fill:var(--ink);paint-order:stroke;stroke:var(--white);stroke-width:.06px}

/* ---------- forms: email signup + contact ---------- */
.signup{max-width:680px;margin:32px auto 0;padding:24px;border:3px solid var(--ink);border-radius:var(--radius);background:var(--white)}
.signup-h{font-size:clamp(1.3rem,3.5vw,1.7rem);margin:0 0 8px}
.signup-row{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}
.signup-row input{flex:1 1 220px;min-width:0;min-height:54px;font:inherit;padding:10px 14px;border:3px solid var(--ink);border-radius:10px}
.signup-row .btn{margin:0}
.signup-ok{display:flex;gap:10px;align-items:flex-start;font-size:1rem}
.signup-ok input{margin-top:5px;width:22px;height:22px;flex:none}
.signup .hp,.contact .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.contact{max-width:680px}
.contact label{display:block;font-weight:700;margin:16px 0 6px}
.contact input,.contact select,.contact textarea{display:block;width:100%;min-height:54px;font:inherit;padding:10px 14px;border:3px solid var(--ink);border-radius:10px;background:#fff;color:var(--ink)}
.contact textarea{resize:vertical}