:root{
  --toolbar-h:72px;
  --footer-h:68px;
  --bg:#ece9e2;
  --paper:#fff;
  --ink:#141414;
  --muted:#6b6b66;
  --line:#d3d0c9;
}
*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif}
button,a{font:inherit;color:inherit}
button{cursor:pointer}
.reader-shell{height:100vh;height:100dvh;display:grid;grid-template-rows:var(--toolbar-h) minmax(0,1fr) var(--footer-h);overflow:hidden}
.reader-toolbar{position:relative;z-index:20;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:max(10px,env(safe-area-inset-top)) max(22px,env(safe-area-inset-right)) 10px max(22px,env(safe-area-inset-left));border-bottom:1px solid var(--line);background:rgba(250,249,246,.96);backdrop-filter:blur(14px)}
.reader-close{justify-self:start;text-decoration:none;font-weight:700;border-bottom:1px solid currentColor;line-height:1.4}
.reader-title{text-align:center;line-height:1.25}.reader-title strong{display:block;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:16px;letter-spacing:.05em}.reader-title span{display:block;margin-top:3px;color:var(--muted);font-size:10px;letter-spacing:.15em}
.reader-fullscreen{justify-self:end;border:1px solid #aaa79f;background:transparent;padding:8px 12px;font-size:12px}
.reader-stage{position:relative;min-height:0;overflow:hidden;display:flex;align-items:center;justify-content:center;padding:24px 64px 20px;outline:none;touch-action:pan-y;background:radial-gradient(ellipse at center,rgba(255,255,255,.72) 0%,rgba(255,255,255,0) 58%)}
.book{position:relative;display:grid;grid-template-columns:minmax(0,1fr) 18px minmax(0,1fr);align-items:stretch;width:min(1040px,calc(100vw - 180px),calc((100dvh - var(--toolbar-h) - var(--footer-h) - 44px) * 1.37));aspect-ratio:1.37 / 1;max-height:calc(100dvh - var(--toolbar-h) - var(--footer-h) - 44px);filter:drop-shadow(0 20px 36px rgba(32,30,25,.18))}
.page{position:relative;min-width:0;height:100%;display:flex;align-items:center;background:var(--paper);overflow:hidden}.page img{display:block;width:100%;height:100%;object-fit:contain;background:#fff;user-select:none;-webkit-user-drag:none}
.page-left{border-radius:4px 0 0 4px;box-shadow:inset -16px 0 24px -25px rgba(0,0,0,.65)}
.page-right{border-radius:0 4px 4px 0;box-shadow:inset 16px 0 24px -25px rgba(0,0,0,.65)}
.gutter{position:relative;background:linear-gradient(90deg,rgba(0,0,0,.10),rgba(255,255,255,.5) 48%,rgba(0,0,0,.10));z-index:2}
.page.is-empty{visibility:hidden}.book.is-cover{display:flex;justify-content:center;width:min(430px,calc(100vw - 160px))}.book.is-cover .page-left,.book.is-cover .gutter{display:none}.book.is-cover .page-right{width:100%;border-radius:4px;box-shadow:none}
.turn-zone{position:absolute;z-index:10;top:0;bottom:0;width:22%;border:0;background:transparent;opacity:0}.turn-next{left:0}.turn-prev{right:0}
.reader-footer{position:relative;z-index:20;display:grid;grid-template-columns:110px minmax(150px,360px) 110px;align-items:center;justify-content:center;gap:28px;padding:10px max(20px,env(safe-area-inset-right)) max(10px,env(safe-area-inset-bottom)) max(20px,env(safe-area-inset-left));border-top:1px solid var(--line);background:rgba(250,249,246,.97)}
.nav-button{height:42px;border:1px solid #aaa79f;background:#fff;font-weight:700}.nav-button:disabled{opacity:.35;cursor:default}
.reader-progress{text-align:center;font-size:12px;color:var(--muted)}.progress-track{height:2px;background:#d7d4ce;margin-top:8px;overflow:hidden}.progress-track i{display:block;width:0;height:100%;background:#252525;transition:width .2s ease}
.reader-end{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:24px;background:rgba(21,20,18,.72);backdrop-filter:blur(8px)}.reader-end[hidden]{display:none}.reader-end-card{width:min(520px,100%);background:#fff;padding:44px;text-align:center;box-shadow:0 28px 70px rgba(0,0,0,.3)}.reader-end-card p{font-size:12px;letter-spacing:.18em;color:var(--muted)}.reader-end-card h1{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:28px;font-weight:500;line-height:1.6}.reader-end-actions a{display:flex;align-items:center;justify-content:center;min-height:54px;margin-top:28px;background:#161616;color:#fff;text-decoration:none;font-weight:700}.reader-end-card button{margin-top:18px;border:0;background:none;border-bottom:1px solid currentColor;padding:3px}
@media(max-width:760px){
  :root{--toolbar-h:68px;--footer-h:62px}
  .reader-toolbar{grid-template-columns:72px 1fr 72px;padding-top:max(8px,env(safe-area-inset-top));padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}
  .reader-title strong{font-size:15px}.reader-title span{display:none}.reader-fullscreen{font-size:0;border:0;padding:8px}.reader-fullscreen:after{content:"□";font-size:22px}
  .reader-stage{padding:12px max(10px,env(safe-area-inset-right)) 10px max(10px,env(safe-area-inset-left));touch-action:pan-y}
  .book,.book.is-cover{display:flex;width:100%;height:100%;max-height:none;filter:drop-shadow(0 10px 24px rgba(32,30,25,.16))}
  .book .page-left,.book .gutter{display:none}.book .page-right{width:100%;height:100%;border-radius:2px;box-shadow:none;background:transparent}.book .page-right img{width:100%;height:100%;object-fit:contain;background:transparent}
  .turn-zone{width:34%}.turn-next{left:0}.turn-prev{right:0}
  .reader-footer{grid-template-columns:74px 1fr 74px;gap:12px;padding-top:8px}.nav-button{height:38px;font-size:13px}.progress-track{margin-top:5px}
  .reader-end-card{padding:34px 24px}.reader-end-card h1{font-size:23px}
}
@media(max-height:650px) and (min-width:761px){.reader-stage{padding-top:12px;padding-bottom:10px}.book{max-height:calc(100dvh - var(--toolbar-h) - var(--footer-h) - 22px)}}