/* Our Experience, the casebook: a cloth-bound book on a forest reading-room backdrop. The cover opens on arrival,
   pages turn on a spine, and on phones it reads one page at a time. Shares the kit from svc.css. */

.cb-stage{position:relative;min-height:calc(100svh - var(--svc-header,90px));display:flex;align-items:center;color:var(--cream);background:radial-gradient(60% 55% at 50% 42%,#2f5a39 0%,transparent 70%),radial-gradient(90% 80% at 50% 120%,#0f2014 0%,transparent 60%),var(--ink);overflow:hidden}
.cb-wrap{width:100%;display:grid;grid-template-columns:56px minmax(0,1fr) 56px;align-items:center;gap:clamp(12px,2vw,32px);padding-block:clamp(24px,5svh,56px)}

/* ---------- the book ---------- */
.cb-book{--page-ratio:.71;position:relative;justify-self:center;width:min(100%,calc((100svh - var(--svc-header,90px) - 2 * clamp(24px,5svh,56px)) * 2 * var(--page-ratio)),1180px);aspect-ratio:calc(2 * var(--page-ratio));perspective:2600px;transition:transform .9s cubic-bezier(.45,.05,.25,1);cursor:pointer}
.cb-book.is-closed{transform:translateX(-25%)}
.cb-book::after{content:'';position:absolute;z-index:4;left:50%;top:0;bottom:0;width:6%;transform:translateX(-50%);background:linear-gradient(90deg,transparent,#2a221526 40%,#2a221540 50%,#2a221526 60%,transparent);pointer-events:none;transition:opacity .5s}
.cb-book.is-closed::after{opacity:0}
.cb-slot{position:absolute;top:0;width:50%;height:100%;filter:drop-shadow(0 30px 34px #0007)}
.cb-left{left:0}
.cb-right{left:50%}

/* ---------- pages ---------- */
.cb-page{position:relative;width:100%;height:100%;overflow:hidden;color:#2d3127;background:#fbf7ec;container-type:inline-size}
.cb-left .cb-page,.cb-face-back .cb-page{border-radius:5px 0 0 5px;background:linear-gradient(90deg,#efe8d8,#fdfaf2 10%,#fbf7ec 88%,#e9e1cf)}
.cb-right .cb-page,.cb-face-front .cb-page{border-radius:0 5px 5px 0;background:linear-gradient(90deg,#e9e1cf,#fbf7ec 12%,#fdfaf2 90%,#efe8d8)}
.cb-page-inner{box-sizing:border-box;height:100%;padding:11% 11% 9%;overflow:hidden;font:400 clamp(13px,3.5cqi,18px)/1.62 var(--serif);font-variation-settings:"SOFT" 30}
.cb-page-inner p{margin:0 0 .85em}
.cb-page-inner h3{margin:1.15em 0 .45em;font:italic 300 1.42em/1.15 var(--serif);letter-spacing:-.01em;color:var(--gold-text)}
.cb-page-inner>h3:first-child{margin-top:0}
.cb-first::first-letter{float:left;margin:.06em .1em 0 0;font:600 3.5em/.78 var(--serif);font-variation-settings:"SOFT" 100;color:var(--ink)}
.cb-page-inner a{color:var(--ink);text-decoration-color:var(--gold);text-underline-offset:3px}
.cb-drew{margin-top:1.4em!important;padding-top:.9em;border-top:1px solid var(--rule);font-style:italic;font-size:.9em;color:var(--muted)}

/* chapter opener */
.is-opener .cb-page-inner{display:flex;flex-direction:column;justify-content:center}
.cb-opener img{display:block;width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:3px 20px 3px 3px;box-shadow:0 18px 28px -18px #1f3d2690}
.cb-opener h2{margin:.85em 0 .4em;font:400 2.15em/1.02 var(--serif);letter-spacing:-.035em;font-variation-settings:"SOFT" 50;color:var(--ink)}
.cb-place{margin:0!important;font:italic 400 1.1em/1.3 var(--serif);color:var(--gold-text)}

/* contents */
.is-contents .cb-page-inner{display:flex;flex-direction:column;justify-content:center}
.cb-intro{margin:0 0 1.6em!important;font:400 1.55em/1.3 var(--serif);letter-spacing:-.015em;color:var(--ink)}
.cb-toc{list-style:none;margin:0;padding:0;border-top:1px solid var(--rule)}
.cb-toc a{display:block;padding:.85em 0;border-bottom:1px solid var(--rule);text-decoration:none}
.cb-toc-title{display:block;font-size:1.12em;line-height:1.25;color:var(--ink);transition:color .3s,transform .5s var(--ease)}
.cb-toc-place{display:block;margin-top:.25em;font-style:italic;font-size:.9em;color:var(--muted)}
.cb-toc a:hover .cb-toc-title,.cb-toc a:focus-visible .cb-toc-title{color:var(--gold-text);transform:translateX(.4em)}

/* blank verso and the closing page */
.is-blank .cb-page-inner{display:grid;place-items:center}
.cb-blank-mark{width:16%;color:var(--gold-text);opacity:.35}
.cb-blank-mark svg{display:block;width:100%;height:auto}
.is-end .cb-page-inner{display:flex;flex-direction:column;justify-content:center}
.cb-end-text{margin:0 0 1.4em!important;font:400 1.7em/1.28 var(--serif);letter-spacing:-.02em;color:var(--ink)}
.cb-end-sub{margin:0 0 1.6em!important;font-size:.95em;color:var(--muted)}
.cb-cta{align-items:flex-start;margin:0}
.cb-page .svc-slide{--knob:54px}

/* ---------- the cover ---------- */
.cb-cover{position:relative;width:100%;height:100%;border-radius:3px 8px 8px 3px;color:#e7c46a;background:repeating-linear-gradient(45deg,#ffffff08 0 1px,transparent 1px 4px),repeating-linear-gradient(-45deg,#0000001a 0 1px,transparent 1px 4px),radial-gradient(120% 90% at 30% 20%,#2c5636,transparent 70%),#1d3a24;box-shadow:inset 16px 0 18px -12px #0009,inset -2px 0 0 #ffffff12}
.cb-cover-frame{position:absolute;inset:7%;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:12% 8% 9%;border:1.5px solid #d9b25a99;border-radius:2px}
.cb-cover-title{margin:0;text-align:center;font:400 clamp(28px,9cqi,64px)/.95 var(--serif);letter-spacing:-.035em;background:linear-gradient(160deg,#f3d989 10%,#c99a35 45%,#f0d27c 60%,#b8862a 90%);-webkit-background-clip:text;background-clip:text;color:transparent}
.cb-cover-title em{display:block;font-weight:300}
.cb-cover{container-type:inline-size}
.cb-cover-mark{width:20%;color:#d9b25a;opacity:.75}
.cb-cover-mark svg{display:block;width:100%;height:auto}
.cb-cover-press{margin:0;font:italic 400 clamp(12px,3.4cqi,18px)/1 var(--serif);color:#d9b25acc}

/* ---------- the turning leaf ---------- */
.cb-leaf{position:absolute;z-index:6;top:0;left:50%;width:50%;height:100%;transform-origin:0 50%;transform-style:preserve-3d;pointer-events:none}
.cb-leaf.is-single{left:0;width:100%}
.cb-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden}
.cb-face-back{transform:rotateY(180deg)}
.cb-face::after{content:'';position:absolute;inset:0;pointer-events:none;border-radius:inherit;animation:cb-shade .9s ease-in-out}
.cb-face-front::after{background:linear-gradient(90deg,#0000003d,transparent 40%)}
.cb-face-back::after{background:linear-gradient(270deg,#0000003d,transparent 40%)}
@keyframes cb-shade{0%,100%{opacity:0}50%{opacity:1}}
.cb-measure{position:absolute;left:0;top:0;visibility:hidden;pointer-events:none}

/* ---------- controls ---------- */
.cb-turn{display:grid;place-items:center;width:56px;height:56px;border-radius:50%;border:1px solid #faf7ef4d;background:transparent;color:var(--cream);font:400 20px/1 var(--sans);cursor:pointer;transition:background .35s,color .35s,border-color .35s,opacity .35s,transform .45s var(--ease)}
.cb-turn:hover:not(:disabled),.cb-turn:focus-visible{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.cb-prev:hover:not(:disabled){transform:translateX(-4px)}
.cb-next:hover:not(:disabled){transform:translateX(4px)}
.cb-turn:disabled{opacity:.2;cursor:default}
.cb-turn:focus-visible{outline:3px solid var(--gold);outline-offset:4px}

/* arrival: the book rises onto the desk */
.js .cb-book{opacity:0;translate:0 40px}
.js .cb-stage.is-in .cb-book{opacity:1;translate:none;transition:opacity 1s,translate 1.2s var(--ease),transform .9s cubic-bezier(.45,.05,.25,1)}

/* ---------- no script: the chapters read as a plain article ---------- */
.cb-source{display:none}
.no-js .cb-wrap{display:none}
.no-js .cb-source{display:block;width:min(720px,calc(100% - 48px));margin:0 auto;padding-block:60px;color:var(--cream)}
.no-js .cb-source img{max-width:100%;height:auto}
.no-js .cb-source a{color:var(--gold)}

/* ---------- phones: one page at a time, controls beneath ---------- */
@media(max-width:820px){
  .cb-stage{align-items:flex-start}
  .cb-wrap{grid-template-columns:1fr 1fr;grid-template-areas:"book book" "prev next";row-gap:18px;padding-block:18px 24px}
  .cb-book{grid-area:book;width:100%;max-width:520px;aspect-ratio:auto;height:calc(100svh - var(--svc-header,70px) - 120px);min-height:460px;max-height:820px}
  .cb-book.is-closed{transform:none}
  .cb-book::after{display:none}
  .cb-left{width:100%}
  .cb-right{display:none}
  .cb-left .cb-page,.cb-face-front .cb-page,.cb-face-back .cb-page{border-radius:4px;background:linear-gradient(90deg,#efe8d8,#fdfaf2 7%,#fbf7ec 94%,#efe8d8)}
  .cb-page-inner{padding:30px 26px 26px;font-size:15.5px}
  .cb-cover{border-radius:4px}
  .cb-prev{grid-area:prev;justify-self:end}
  .cb-next{grid-area:next;justify-self:start}
}
@media(prefers-reduced-motion:reduce){
  .cb-book,.js .cb-book{transition:none!important;opacity:1;translate:none}
  .cb-face::after{animation:none}
}