/* ============ THE LIBRARY: newsletters as books on a shelf ============
   Each book is a real button. Spine shows title + date. Hover pulls it out of the row,
   click brings it forward and opens it (a <dialog>). All colors from tokens. */
.lib{padding:clamp(60px,10vh,130px) clamp(20px,4vw,52px);max-width:1560px;margin:0 auto}
.lib-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:clamp(26px,5vh,48px)}
.lib-head p{margin-top:16px;font-size:15.5px;font-weight:300;line-height:1.66;color:var(--ink-70);max-width:52ch}
.lib-filter{display:flex;gap:8px;flex-wrap:wrap}
.lib-filter button{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-70);
  background:transparent;border:1px solid var(--line-strong);border-radius:100px;padding:9px 14px;cursor:pointer;transition:color .2s,border-color .2s,background .2s}
.lib-filter button:hover{color:var(--ink);border-color:var(--ink)}
.lib-filter button[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}

.shelf-wrap{perspective:1600px;perspective-origin:50% 40%}
.shelf{display:flex;align-items:flex-end;gap:5px;padding:0 clamp(16px,3vw,44px) 0;min-height:340px;
  transform-style:preserve-3d;overflow-x:auto;overflow-y:visible;scrollbar-width:thin;scroll-snap-type:x proximity}
.shelf::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px}
.shelf-board{height:14px;margin:0 clamp(6px,1vw,16px);border-radius:3px;background:linear-gradient(180deg,var(--paper-2),var(--white));
  border-top:1px solid var(--line-strong);box-shadow:0 30px 60px -20px rgba(0,0,0,.7);position:relative}
.shelf-board::before{content:"";position:absolute;inset:-1px 0 auto;height:1px;background:linear-gradient(90deg,transparent,var(--line-strong),transparent)}

/* listitem wrapper for each book: transparent to the shelf's flex layout,
   present in the accessibility tree so role="list" has real list items. */
.book-slot{display:flex;align-items:flex-end;flex:0 0 auto;transform-style:preserve-3d}

.book{position:relative;flex:0 0 auto;width:var(--w,54px);height:var(--h,300px);border:0;padding:0;cursor:pointer;
  transform-style:preserve-3d;transform:rotateY(0deg) translateZ(0);transition:transform .45s cubic-bezier(.2,.7,.2,1);scroll-snap-align:start;
  background:transparent;text-align:left}
.book:focus-visible{outline:2px solid var(--cobalt);outline-offset:4px;border-radius:3px}
.spine{position:absolute;inset:0;border-radius:3px 2px 2px 3px;background:var(--c);display:flex;flex-direction:column;justify-content:space-between;
  align-items:center;padding:14px 0 12px;overflow:hidden;box-shadow:inset 3px 0 6px -3px rgba(255,255,255,.18),inset -3px 0 6px -3px rgba(0,0,0,.6),0 12px 28px -14px rgba(0,0,0,.8)}
.spine::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.12),transparent 30%,transparent 70%,rgba(0,0,0,.25))}
.spine-title{writing-mode:vertical-rl;transform:rotate(180deg);font-family:var(--display);font-weight:600;font-size:13px;letter-spacing:-.01em;
  color:var(--ink);white-space:nowrap;max-height:calc(100% - 60px);overflow:hidden;text-overflow:ellipsis}
.spine-num{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--ink);opacity:.75;transform:rotate(0)}
.spine-mark{width:14px;height:14px;border-radius:50%;border:1px solid rgba(241,239,232,.5);position:relative}
.spine-mark::after{content:"";position:absolute;inset:4px;border-radius:50%;background:var(--ink);opacity:.8}
.book .cover{position:absolute;top:0;bottom:0;left:100%;width:calc(var(--h,300px) * .68);transform-origin:left;transform:rotateY(90deg);
  background:var(--c);border-radius:0 4px 4px 0;box-shadow:0 30px 60px -20px rgba(0,0,0,.9);padding:22px;display:flex;flex-direction:column;justify-content:space-between;opacity:0;transition:opacity .2s}
.cover b{font-family:var(--display);font-weight:600;font-size:17px;line-height:1.15;letter-spacing:-.02em;color:var(--ink)}
.cover span{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);opacity:.7}
@media(hover:hover){
  .book:hover,.book:focus-visible{transform:translateZ(46px) rotateY(-32deg) translateY(-10px);z-index:2}
  .book:hover .cover,.book:focus-visible .cover{opacity:1;transition-delay:.12s}
}
.book.dim{opacity:.28;filter:saturate(.3)}

/* the open book */
.reader{border:0;padding:0;background:transparent;max-width:min(880px,94vw);width:100%;color:var(--ink);margin:auto;inset:0;position:fixed;overflow:visible}
.reader::backdrop{background:rgba(15,20,36,.86)}
/* the device: an iPad in the hand, the issue on its screen */
.device{position:relative;background:var(--ink);border-radius:34px;padding:16px 16px 22px;box-shadow:0 60px 120px -30px rgba(15,20,36,.7),0 0 0 1px rgba(243,237,227,.12) inset;
  transform-origin:50% 100%;animation:deviceIn .65s cubic-bezier(.2,.8,.2,1)}
@keyframes deviceIn{from{opacity:0;transform:perspective(1400px) rotateX(10deg) translateY(36px) scale(.96)}to{opacity:1;transform:none}}
.device-bar{display:flex;justify-content:space-between;align-items:center;padding:0 14px 8px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:rgba(243,237,227,.7)}
.device-sig{display:inline-flex;gap:2px;align-items:flex-end}.device-sig i{display:block;width:3px;background:rgba(243,237,227,.7);border-radius:1px}
.device-sig i:nth-child(1){height:5px}.device-sig i:nth-child(2){height:8px}.device-sig i:nth-child(3){height:11px}
.device-screen{background:var(--white);border-radius:20px;height:min(74vh,720px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent;box-shadow:0 0 0 1px rgba(15,20,36,.6) inset}
.device-screen:focus-visible{outline:2px solid var(--cobalt);outline-offset:-2px}
.device-home{width:96px;height:4px;border-radius:2px;background:rgba(243,237,227,.45);margin:12px auto 0}
.issue-cover{background:var(--c,var(--cobalt));color:var(--paper);padding:clamp(28px,4vw,48px) clamp(24px,4vw,44px);min-height:44%;display:flex;flex-direction:column;justify-content:flex-end;gap:14px;position:relative}
.issue-cover .spine-num{font-size:11px;letter-spacing:.16em;opacity:.85}
.issue-cover h2{font-family:var(--display);font-weight:600;font-size:clamp(28px,3.6vw,46px);line-height:1.02;letter-spacing:-.03em;margin:0;text-wrap:balance;max-width:16ch}
.issue-cover small{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;opacity:.8}
.issue-swipe{position:absolute;right:clamp(24px,4vw,44px);bottom:18px;font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;opacity:.7;animation:swipeHint 1.8s ease-in-out infinite}
@keyframes swipeHint{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}
.issue-body{padding:clamp(24px,4vw,44px)}
.issue-body p{font-size:16px;font-weight:400;line-height:1.75;color:var(--ink-70);max-width:60ch}
.issue-body p+p{margin-top:16px}
.issue-body p:first-child{font-size:clamp(18px,1.9vw,22px);color:var(--ink);font-weight:400;line-height:1.5}
.issue-foot{margin:8px clamp(24px,4vw,44px) 0;padding:20px 0 clamp(24px,4vw,40px);border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;align-items:center}
.issue-foot .kicker{font-size:10px}
.issue-nav{display:inline-flex;gap:8px;flex-wrap:wrap}
.reader-close{position:absolute;top:-8px;right:-8px;width:42px;height:42px;border-radius:50%;border:1px solid var(--line-strong);background:var(--paper);color:var(--ink);cursor:pointer;font-size:20px;line-height:1;box-shadow:var(--shadow-float);z-index:2}
.reader-close:hover{border-color:var(--ink);transform:rotate(90deg)}.reader-close{transition:transform .35s cubic-bezier(.2,.8,.2,1),border-color .2s}
@media(max-width:600px){.reader{max-width:96vw}.device{border-radius:26px;padding:10px 10px 16px}.device-screen{height:78vh;border-radius:16px}.issue-cover{min-height:38%}.reader-close{top:-6px;right:-6px}}
@media(prefers-reduced-motion:reduce){.device{animation:none}.issue-swipe{animation:none}.reader-close{transition:none}}

/* subscribe strip under the shelf */
.lib-sub{margin-top:clamp(30px,5vh,56px);display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;padding:clamp(20px,3vw,34px);border:1px solid var(--line);border-radius:16px;background:var(--white)}
.lib-sub h3{font-family:var(--display);font-weight:600;font-size:clamp(20px,2.2vw,28px);letter-spacing:-.02em}
.lib-sub p{margin-top:8px;font-size:14px;font-weight:300;color:var(--ink-70);max-width:52ch}
.lib-sub form{display:flex;gap:10px;flex-wrap:wrap}
.lib-sub input{font-family:var(--body);font-size:15px;color:var(--ink);background:var(--paper-2);border:1px solid var(--line-strong);border-radius:100px;padding:13px 18px;min-width:260px}
.lib-sub input:focus{outline:none;border-color:var(--cobalt);box-shadow:0 0 0 3px rgba(77,102,255,.18)}
@media(max-width:760px){.lib-sub{grid-template-columns:1fr}}

@media(prefers-reduced-motion:reduce){.book{transition:none}.reader-in{animation:none}}

/* book cloth: four tints mixed from the tokens, never a raw value */
.c1{--c:color-mix(in srgb,var(--cobalt) 78%,var(--paper))}
.c2{--c:color-mix(in srgb,var(--cobalt) 42%,var(--paper))}
.c3{--c:color-mix(in srgb,var(--mint) 70%,var(--cobalt))}
.c4{--c:color-mix(in srgb,var(--champagne) 75%,var(--ink))}

/* premium books */
.spine{border-radius:4px 2px 2px 4px;
  background:
    linear-gradient(90deg,rgba(255,255,255,.28),rgba(255,255,255,0) 18%,rgba(0,0,0,0) 62%,rgba(0,0,0,.35)),
    repeating-linear-gradient(180deg,rgba(255,255,255,.05) 0 2px,rgba(0,0,0,.04) 2px 4px),
    var(--c);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.08),inset 6px 0 10px -6px rgba(255,255,255,.35),inset -8px 0 12px -8px rgba(0,0,0,.7),0 14px 30px -12px rgba(0,0,0,.65)}
.spine::before{background:linear-gradient(180deg,rgba(255,255,255,.18),transparent 14%,transparent 86%,rgba(0,0,0,.35))}
.spine::after{content:"";position:absolute;left:10%;right:10%;top:10px;height:2px;border-radius:2px;background:linear-gradient(90deg,transparent,rgba(212,175,55,.85),transparent);box-shadow:0 calc(100% - 6px) 0 0 rgba(212,175,55,.6)}
.spine-num,.spine-title{color:#F2E4B8;text-shadow:0 1px 0 rgba(0,0,0,.45)}
.spine-title{font-weight:500;letter-spacing:.01em}
.spine-mark{border-color:rgba(242,228,184,.7)}
.spine-mark::after{background:#F2E4B8}
.book{transition:transform .55s cubic-bezier(.2,.8,.2,1),filter .4s}
.book:hover,.book:focus-visible{transform:translateZ(70px) rotateY(-34deg) translateY(-16px);filter:drop-shadow(0 30px 30px rgba(0,0,0,.45))}
.book .cover{background:linear-gradient(135deg,rgba(255,255,255,.22),rgba(255,255,255,.04) 40%,rgba(0,0,0,.25)),var(--c);border:1px solid rgba(255,255,255,.18);backdrop-filter:blur(6px)}
.book .cover::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 30%,rgba(255,255,255,.35) 50%,transparent 70%);transform:translateX(-120%);transition:transform .9s ease}
.book:hover .cover::after{transform:translateX(120%)}
.cover b,.cover span{color:#F8F1DC}
.shelf-board{height:18px;border-radius:4px;background:linear-gradient(180deg,#E9DCC3,#C9B593 55%,#A8916A);box-shadow:0 22px 40px -18px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.7)}
.shelf-wrap{position:relative}
.shelf-wrap::after{content:"";position:absolute;left:0;right:0;bottom:-30px;height:60px;background:radial-gradient(ellipse 60% 100% at 50% 0,rgba(20,26,43,.18),transparent 70%);pointer-events:none}