.bk-lead{font-size:clamp(18px,1.8vw,23px);line-height:1.38;letter-spacing:-.01em}.bk-facts{display:grid;gap:10px;margin:24px 0 0;padding-top:16px;border-top:1px solid rgba(0,0,0,.14)}.bk-facts div{display:flex;justify-content:space-between;gap:12px;font-size:14px}.bk-facts dt{color:color-mix(in srgb,var(--paper-ink) 55%,transparent)}.bk-facts dd{margin:0;font-weight:600;text-align:right}.bk-list{padding-left:20px;display:flex;flex-direction:column;gap:8px;font-size:15px}.bk-list li::marker{color:var(--c);font-weight:700}.bk-tags{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin-top:18px}.bk-tags li{font-size:12px;border:1px solid rgba(0,0,0,.2);border-radius:999px;padding:3px 10px}.bk-folio{position:absolute;bottom:18px;left:0;right:0;text-align:center;font-size:11px;color:rgba(0,0,0,.45);font-variant-numeric:tabular-nums}.bk-mobile-left{display:none}:root[data-theme="light"] .leaf,:root[data-theme="light"] .cover-back{outline:1px solid var(--rule);outline-offset:-1px}.cform{display:flex;flex-direction:column;gap:18px;max-width:640px;padding-bottom:32px}.cform-lead{font-size:19px;line-height:1.38;color:var(--fg)}.cform-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.cform label{display:flex;flex-direction:column;gap:8px;font-size:12px;font-weight:600;color:var(--muted)}.cform input,.cform textarea{width:100%;background:var(--raise);border:1px solid var(--rule);color:var(--fg);border-radius:10px;padding:12px 14px;font:inherit;font-size:16px;font-weight:400;transition:border-color .2s}.cform textarea{resize:vertical;min-height:140px;line-height:1.5}.cform input:focus,.cform textarea:focus{outline:none;border-color:var(--fg)}.cform-hp{position:absolute!important;left:-9999px;width:1px;height:1px;overflow:hidden}.cform-foot{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.cform-send{display:inline-flex;align-items:center;gap:10px;background:var(--fg);color:var(--bg);border:1px solid var(--fg);border-radius:999px;padding:12px 22px;font:inherit;font-size:15px;font-weight:600;cursor:pointer;transition:opacity .2s}.cform-send:hover{opacity:.85}.cform-send:disabled{opacity:.5;cursor:default}.cform-status{font-size:14px;color:var(--muted)}.cform-status.ok{color:#22A447}.cform-status.err{color:#E5484D}@media (max-width:820px){.book{transform:scale(.94);height:min(640px,calc(100svh - 110px))}.book.open{transform:none}.cover{left:0;width:100%;transition:transform 1s cubic-bezier(.4,.1,.2,1),opacity .3s .7s}.book.open .cover{opacity:0;pointer-events:none}.leaf-right{left:0;width:100%;border-radius:6px;box-shadow:none;padding-bottom:28px}.cover-back{display:none}.bk-mobile-left{display:block;margin-bottom:24px}.leaf-right .bk-folio{position:static;display:block;margin-top:28px}.reader-bar{flex-wrap:wrap}}:root{--head:112px;--ease:cubic-bezier(.2,.8,.2,1)}html{-webkit-text-size-adjust:100%}.top{position:fixed;inset:0 0 auto;z-index:40;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;padding:max(18px,env(safe-area-inset-top,0px)) var(--pad-r) 18px var(--pad);background:var(--bg);border-bottom:1px solid transparent;transition:border-color .3s,background .3s}.top.stuck{border-color:var(--rule)}.brand{grid-column:2;margin:0;text-align:center;font-size:clamp(20px,2.3vw,32px);font-weight:600;letter-spacing:-.025em;line-height:1.15}.brand a{color:inherit}.brand a:hover{color:inherit}.brand span{display:block}.brand span+span{color:var(--muted);font-weight:500}.nav{grid-column:1;grid-row:1;display:flex;gap:clamp(14px,2vw,26px);font-size:14px;font-weight:500}.nav a{color:var(--muted);position:relative;padding:4px 0;transition:color .2s}.nav a:hover,.nav a[aria-current="true"]{color:var(--fg)}.nav a[aria-current="true"]::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:currentColor}.theme-btn{grid-column:3;justify-self:end}main{padding-top:var(--head)}.stage{min-height:calc(100svh - var(--head));display:flex;flex-direction:column;align-items:center;justify-content:center;gap:clamp(16px,2.6vh,28px);padding:clamp(12px,3vh,32px) var(--pad-r) clamp(24px,5vh,56px) var(--pad);scroll-margin-top:var(--head)}.fb-wrap{width:min(92vw,calc((100svh - var(--head) - 110px) * 1.44),1180px);max-width:100%}.fb{--flip:.55s;position:relative;width:100%;aspect-ratio:1.44;perspective:2600px;container-type:size;transition:transform .6s var(--ease);cursor:pointer;touch-action:pan-y;outline:none}.fb:focus-visible{outline:2px solid var(--fg);outline-offset:8px;border-radius:6px}.fb.closed{transform:translateX(-25%)}.fb.ended{transform:translateX(25%)}.fb::before{content:"";position:absolute;left:4%;right:4%;bottom:-5%;height:8%;background:radial-gradient(closest-side,rgba(0,0,0,.45),transparent);filter:blur(6px);z-index:-1}:root[data-theme="light"] .fb::before{background:radial-gradient(closest-side,rgba(0,0,0,.18),transparent)}.fb-base{position:absolute;top:0;bottom:0;left:50%;width:50%;background:#1b1b1b;border-radius:0 6px 6px 0;box-shadow:inset 12px 0 18px -12px rgba(0,0,0,.6)}.fl{position:absolute;top:0;bottom:0;left:50%;width:50%;transform-origin:left center;transform-style:preserve-3d;transition:transform var(--flip) cubic-bezier(.45,.05,.3,1)}.fl.flipped{transform:rotateY(-180deg)}.fp{position:absolute;inset:0;overflow:hidden;background:var(--paper);color:var(--paper-ink);padding:6.5cqh 5.5cqh;display:flex;flex-direction:column;gap:2.4cqh;transition:visibility 0s linear calc(var(--flip) / 2)}.fp.f{border-radius:0 6px 6px 0;box-shadow:inset 3cqh 0 4cqh -3cqh rgba(0,0,0,.28);visibility:visible}.fp.b{transform:scaleX(-1);border-radius:6px 0 0 6px;box-shadow:inset -3cqh 0 4cqh -3cqh rgba(0,0,0,.28);visibility:hidden}.fl.flipped .fp.f{visibility:hidden}.fl.flipped .fp.b{visibility:visible}.fl::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(0,0,0,.25),transparent 60%);opacity:0;transition:opacity calc(var(--flip) / 2) ease}.fl.turning::after{opacity:1}