/* decidable.ink — X Marks the Spot, a Brian Thomas series. Palette & type borrowed from brianthomas.ink. */
:root{--ink:#1c2230;--ink-2:#2e3850;--sepia:#6b5a45;--sepia-2:#8a7558;--paper:#f6efdf;--paper-2:#efe5cf;--rule:#d8c9a8;--x:#c4161c;--easy:#2f7d3a;--hard:#c4161c;
--display:'Cormorant Garamond','EB Garamond',Garamond,Georgia,serif;--text:'EB Garamond',Garamond,Georgia,serif;--r:4px}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--text);font-size:1.2rem;line-height:1.6;-webkit-font-smoothing:antialiased;
 background-image:radial-gradient(120% 60% at 50% 0%,#fbf7ee 0%,rgba(251,247,238,0) 70%),radial-gradient(80% 50% at 100% 100%,rgba(107,90,69,.07),transparent 70%);
 background-repeat:no-repeat;min-height:100vh;display:flex;flex-direction:column}
main{flex:1;width:100%;max-width:68rem;margin:0 auto;padding:0 1.25rem}
a{color:var(--ink);text-decoration-color:var(--sepia-2);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--sepia)}
:focus-visible{outline:2px solid var(--sepia);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.6rem 1rem;z-index:10}.skip:focus{left:.5rem;top:.5rem}
h1,h2,h3{font-family:var(--display);font-weight:500;line-height:1.1;margin:0;letter-spacing:.01em}
p{margin:0 0 1em}
.masthead{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.25rem 1rem;max-width:68rem;width:100%;margin:0 auto;padding:max(.8rem,env(safe-area-inset-top)) 1.25rem .4rem;border-bottom:1px solid var(--rule)}
.series{display:flex;align-items:center;gap:.2rem;text-decoration:none;font-family:var(--display);font-size:1.5rem;font-weight:600;letter-spacing:.03em;min-height:48px}
.series img{width:40px;height:40px;object-fit:contain}
.byline{display:inline-flex;align-items:center;gap:.4rem;text-decoration:none;font-family:var(--display);font-size:1.2rem;font-style:italic;color:var(--sepia);min-height:48px}
.byline .quill{width:1.8rem;height:1.8rem;color:var(--sepia)}
.byline:hover span{text-decoration:underline}
.nav{display:flex;flex-wrap:wrap;gap:.1rem;margin:0 -.6rem;width:100%}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 .6rem;text-decoration:none;font-size:1.05rem;letter-spacing:.04em;color:var(--ink-2);border-bottom:2px solid transparent}
.nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--sepia)}
@media(min-width:760px){.nav{width:auto;order:3}.masthead{flex-wrap:nowrap}}
.hero{text-align:center;padding:2.5rem 0 1.5rem;max-width:40rem;margin:0 auto}
.hero-x{width:96px;height:96px;object-fit:contain;display:block;margin:0 auto .25rem}
.hero h1{font-size:clamp(2.6rem,8vw,4rem);font-weight:600}
.by{font-style:italic;color:var(--sepia);font-size:1.25rem;margin:.4rem 0 1.2rem}
.lede{font-size:1.35rem}
.rules{font-family:var(--display);font-size:1.3rem;letter-spacing:.03em}
.soon{display:inline-block;border:1px solid var(--rule);padding:.3rem 1rem;border-radius:999px;background:var(--paper-2);color:var(--ink-2);font-size:1.05rem}
section{margin:0 auto 2.5rem}
h2{font-size:2rem;margin:0 0 1rem;text-align:center}
.how{max-width:40rem;border-top:1px solid var(--rule);padding-top:2rem}
.how ul{list-style:none;padding:0;margin:0}.how li{padding:.55rem 0;border-bottom:1px dashed var(--rule)}
.how li strong{font-family:var(--display);font-size:1.25rem}
.shelf{border-top:1px solid var(--rule);padding-top:2rem}
.grid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:1.4rem 1.1rem}
@media(min-width:760px){.grid{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}}
.book figure{margin:0}
.book img{width:100%;height:auto;aspect-ratio:2/3;display:block;border-radius:3px;box-shadow:0 1px 2px rgba(28,34,48,.25),0 8px 22px rgba(28,34,48,.18);background:var(--paper-2)}
.book figcaption{display:flex;flex-direction:column;padding-top:.5rem;line-height:1.25}
.num{font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;color:var(--sepia)}
.t{font-family:var(--display);font-size:1.2rem;font-weight:600}
.eds{font-size:.9rem;color:var(--ink-2)}
.more{text-align:center;margin-top:1.6rem}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:.6rem 1.5rem;font-family:var(--display);font-size:1.2rem;font-weight:600;letter-spacing:.04em;text-decoration:none;border-radius:var(--r);border:1.5px solid var(--ink);background:var(--ink);color:var(--paper)}
.btn:hover{background:var(--ink-2);color:var(--paper)}
.btn-ghost{background:transparent;color:var(--ink)}.btn-ghost:hover{background:var(--paper-2);color:var(--ink)}
.author{max-width:40rem;text-align:center;border-top:1px solid var(--rule);padding-top:2rem}
.intro{text-align:center;max-width:40rem;padding:2rem 0 1rem}
.intro h1{font-size:clamp(2.4rem,7vw,3.4rem);font-weight:600}
.filter{display:inline-flex;gap:.4rem;flex-wrap:wrap;justify-content:center}
.filter button{font:inherit;font-size:1rem;min-height:44px;padding:0 1rem;border:1px solid var(--rule);border-radius:999px;background:var(--paper);color:var(--ink);cursor:pointer}
.filter button[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
#books{margin-bottom:3rem}
.foot{border-top:1px solid var(--rule);text-align:center;padding:1.4rem 1.25rem max(1.4rem,env(safe-area-inset-bottom));color:var(--sepia)}
.roof{font-family:var(--display);font-size:1.25rem;margin:0 0 .3rem}.small{font-size:.95rem;margin:0}
.lede.big{font-family:var(--display);font-size:clamp(1.6rem,4.5vw,2.1rem);line-height:1.25;margin-bottom:.5rem}
.why{max-width:40rem;text-align:center;border-top:1px solid var(--rule);padding-top:2rem}
.about{text-align:left}.about h1,.about .by,.about .lede{text-align:center}.about .btn{display:flex;width:max-content;margin:1rem auto 0}