:root{--fs:19px;--bg:#fff;--fg:#1a1a1a;--mute:#777;--line:#eee;--pill:#000;--pillfg:#fff;--bar:rgba(255,255,255,.88);--w:40rem;
--red:#ff5a5a66;--orange:#ff9f4366;--yellow:#ffe14d80;--green:#5fd38a66;--blue:#5aa9ff66;--indigo:#6b6bff66;--violet:#b06bff66}
[data-theme=dark]{--bg:#0e0e10;--fg:#e8e6e3;--mute:#9a9a9a;--line:#222;--pill:#fff;--pillfg:#000;--bar:rgba(14,14,16,.88)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:5rem}
body{margin:0;background:var(--bg);color:var(--fg);font:300 var(--fs)/1.75 "Nunito Sans","Avenir Next",Avenir,system-ui,sans-serif;-webkit-font-smoothing:antialiased;transition:background .3s,color .3s}
a{color:inherit}
button{font:inherit;color:inherit}
.bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:.5rem;padding:.6rem 1rem;background:var(--bar);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:blur(14px);font-size:15px}
.bar .title{flex:1;font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar .title span{color:var(--mute);font-weight:300}
.tools{display:flex;align-items:center;gap:.15rem}
.ic{background:none;border:0;cursor:pointer;padding:.4rem .55rem;border-radius:999px;font-size:15px;line-height:1;min-width:2.2rem;min-height:2.2rem}
.ic:hover{background:var(--line)}
.pill{display:inline-flex;align-items:center;justify-content:center;background:var(--pill);color:var(--pillfg);border:1px solid var(--pill);border-radius:999px;padding:.55rem 1.1rem;font-size:14px;font-weight:400;text-decoration:none;cursor:pointer;white-space:nowrap}
.pill.ghost{background:transparent;color:var(--fg);border-color:var(--fg)}
.prog{position:absolute;left:0;right:0;bottom:0;height:2px;background:transparent}
.prog i{display:block;height:100%;width:0;background:linear-gradient(90deg,#ff5a5a,#ff9f43,#ffe14d,#5fd38a,#5aa9ff,#6b6bff,#b06bff);transition:width .15s}
.pctRead{position:absolute;right:1rem;bottom:-1.4rem;font-size:11px;color:var(--mute);pointer-events:none}
main{padding:0 1.25rem}
article{max-width:var(--w);margin:0 auto;padding:2rem 0 6rem}
.hero{text-align:center;padding:3rem 0 5rem}
.hero img{width:min(320px,70vw);height:auto;display:block;margin:0 auto 2.5rem;border:0;box-shadow:0 30px 60px -30px rgba(0,0,0,.35)}
.btitle{font-weight:300;font-size:2.1em;line-height:1.2;margin:0 0 .4rem;letter-spacing:-.01em}
.bsub{font-size:1.2em;color:var(--mute);margin:0}
.bauth{margin-top:1.5rem;font-size:.9em;letter-spacing:.15em;text-transform:uppercase;color:var(--mute)}
#book h1{font-weight:300;font-size:1.8em;line-height:1.25;margin:6rem 0 2rem;letter-spacing:-.01em}
#book h2{font-weight:400;font-size:1.3em;margin:3.5rem 0 1rem}
#book h3{font-weight:600;font-size:1em;margin:2.5rem 0 .6rem}
#book p,#book li{margin:0 0 1.15em}
#book blockquote{margin:2rem 0;padding:0 0 0 1.25rem;border-left:2px solid var(--line);color:var(--mute)}
#book table{border-collapse:collapse;width:100%;font-size:.9em}
#book td,#book th{padding:.4rem;border-bottom:1px solid var(--line);text-align:left}
#book img{max-width:100%;height:auto}
#book hr{border:0;height:1px;background:var(--line);margin:4rem 0}
.end{text-align:center;padding:5rem 0 2rem}
.end .dlrow{color:var(--mute);font-size:.9em;margin-top:1.5rem}
mark.hl{color:inherit;border-radius:3px;padding:0 .05em;cursor:pointer}
mark.hl.note{box-shadow:inset 0 -2px 0 currentColor}
mark.c-red{background:var(--red)}mark.c-orange{background:var(--orange)}mark.c-yellow{background:var(--yellow)}mark.c-green{background:var(--green)}mark.c-blue{background:var(--blue)}mark.c-indigo{background:var(--indigo)}mark.c-violet{background:var(--violet)}
.drawer{position:fixed;top:0;bottom:0;left:0;width:min(360px,88vw);background:var(--bg);z-index:40;transform:translateX(-102%);transition:transform .3s ease;overflow:auto;padding:1rem 1.25rem 2rem;font-size:15px}
.drawer.open{box-shadow:0 0 40px rgba(0,0,0,.12)}
.drawer.right{left:auto;right:0;transform:translateX(102%)}
.drawer.open{transform:none}
.dhead{display:flex;justify-content:space-between;align-items:center;font-weight:400;margin-bottom:1rem}
.drawer ol{list-style:none;padding:0;margin:0}
.drawer li a{display:flex;justify-content:space-between;gap:.5rem;padding:.45rem 0;text-decoration:none}
.drawer li.l2 a{padding-left:1rem;color:var(--mute);font-size:14px}
.drawer li a.cur{font-weight:600}
.pct{color:var(--mute);font-size:12px;flex:none}
.dl{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.5rem}
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.25);z-index:30;opacity:0;pointer-events:none;transition:opacity .3s}
.scrim.on{opacity:1;pointer-events:auto}
.ncard{padding:.8rem 0;border-bottom:1px solid var(--line)}
.ncard q{display:block;padding-left:.6rem;border-left:3px solid;cursor:pointer}
.ncard p{margin:.4rem 0 0;color:var(--mute)}
.pop{position:absolute;z-index:50;display:flex;align-items:center;gap:.2rem;background:var(--bg);border-radius:999px;padding:.3rem .4rem;box-shadow:0 8px 30px rgba(0,0,0,.18)}
.pop .sw{display:flex;gap:.25rem}
.pop .sw button{width:1.4rem;height:1.4rem;border-radius:50%;border:0;cursor:pointer}
.modal{position:fixed;inset:0;z-index:60;background:rgba(0,0,0,.3);display:flex;align-items:center;justify-content:center;padding:1rem}
.mbox{background:var(--bg);border-radius:18px;padding:1.5rem;width:min(520px,100%);font-size:15px}
.mbox blockquote{margin:0 0 1rem;color:var(--mute);max-height:8rem;overflow:auto}
.mbox textarea{width:100%;font:inherit;color:var(--fg);background:transparent;border:1px solid var(--line);border-radius:12px;padding:.75rem}
.mrow{display:flex;justify-content:flex-end;gap:.5rem;margin-top:1rem}
.pager{display:none}
/* paged mode */
body.paged{overflow:hidden;height:100dvh}
body.paged main{height:calc(100dvh - 3.4rem);overflow:hidden;padding:0}
body.paged article{max-width:none;height:100%;padding:2rem 0 3rem;margin:0;column-gap:0;column-fill:auto}
body.paged article>*{padding-left:max(1.25rem,calc((var(--colw) - var(--w))/2));padding-right:max(1.25rem,calc((var(--colw) - var(--w))/2));break-inside:avoid-column}
body.paged #book h1{margin-top:2rem;break-before:column}
body.paged .pager{display:flex;position:fixed;bottom:.5rem;left:50%;transform:translateX(-50%);align-items:center;gap:.75rem;font-size:13px;color:var(--mute);background:var(--bar);border-radius:999px;padding:.1rem .4rem;z-index:15}
body.paged .pctRead{display:none}
@media (max-width:640px){
  :root{--fs:18px}
  .bar .title span{display:none}
  #fsDown,#fsUp{display:none}
  .bar .pill{padding:.45rem .8rem;font-size:13px}
  body.paged article>*{break-inside:auto}
}
@media (max-width:400px){#modeBtn{display:none}}
@media print{.bar,.pager,.drawer{display:none}}
[hidden]{display:none!important}