:root {
  color-scheme:light; --desk:#e2e2e2; --paper:#f6f1e6; --ink:#30372f;
  --muted:#50594f; --accent:#8a3f2e; --line:#aeb5aa;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  --reader-width:100vw; --reader-height:100dvh;
}
* { box-sizing:border-box; }
html,body { margin:0; min-width:280px; min-height:100%; background:var(--desk); color:var(--ink); font-family:var(--sans); }
body { overflow:hidden; -webkit-font-smoothing:antialiased; }
button,a { -webkit-tap-highlight-color:transparent; }
button { font:inherit; color:var(--ink); cursor:pointer; touch-action:manipulation; }
button:disabled { cursor:default; opacity:.4; }
button:focus-visible,a:focus-visible { outline:3px solid var(--accent); outline-offset:3px; }
.skip-link { position:fixed; left:12px; top:12px; z-index:10; padding:12px; background:var(--paper); transform:translateY(-200%); }
.skip-link:focus { transform:none; }
.site-footer,.reading-hint { display:none; }
.reader { position:fixed; inset:0; width:var(--reader-width); height:var(--reader-height); padding:0; }
.album-title { position:absolute; z-index:2; top:max(16px,env(safe-area-inset-top)); left:16px; right:16px; margin:0; text-align:center; font-family:"Songti SC","STSong",serif; font-size:24px; font-weight:500; line-height:1.3; letter-spacing:.12em; }
.book-mode { position:absolute; z-index:2; top:50px; left:12px; right:12px; margin:0; text-align:center; font-size:12px; line-height:1.5; color:var(--muted); pointer-events:none; }
.is-3d .book-mode { width:1px; height:1px; overflow:hidden; clip-path:inset(50%); }
#book3d-stage { position:absolute; top:56px; left:0; width:100%; height:calc(100% - 180px); touch-action:pinch-zoom; }
#book3d-stage canvas { display:block; width:100%; height:100%; cursor:zoom-in; }
.is-turning #book3d-stage canvas { cursor:wait; }
.reader-controls { position:absolute; bottom:max(64px,calc(env(safe-area-inset-bottom) + 56px)); left:50%; transform:translateX(-50%); display:flex; align-items:center; justify-content:center; gap:16px; margin:0; }
.page-control { display:flex; justify-content:center; align-items:center; min-width:44px; min-height:44px; padding:0 16px; border:1px solid var(--line); border-radius:4px; color:var(--ink); background:#f8f9f6; font-size:14px; }
.reader-controls .page-control { width:44px; height:44px; padding:0; border-radius:50%; }
.page-control svg { width:18px; height:18px; stroke:currentColor; stroke-width:1.5; }
.control-label { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }
.page-control:hover:enabled,.photo-action:hover:enabled,.zoom-controls button:hover:enabled { background:#fff; border-color:var(--muted); }
.page-control:active:enabled,.photo-action:active:enabled,.zoom-controls button:active:enabled { background:#dddccc; }
.reading-position { width:168px; text-align:center; flex-shrink:0; }
#page-status { margin:0 0 8px; font-size:13px; color:var(--ink); font-variant-numeric:tabular-nums; white-space:nowrap; }
.progress-track { width:104px; height:2px; margin:auto; background:#aeb5aa; }
.progress-track span { display:block; height:100%; background:var(--accent); }
.page-actions { position:absolute; bottom:max(8px,env(safe-area-inset-bottom)); left:max(16px,env(safe-area-inset-left)); right:max(16px,env(safe-area-inset-right)); display:flex; align-items:center; justify-content:center; gap:8px; }
.photo-action { min-width:44px; min-height:44px; max-width:260px; padding:8px 12px; border:1px solid var(--line); border-radius:4px; background:#f8f9f6; color:var(--ink); font-size:13px; line-height:1.4; }
.originals-action { color:var(--accent); border-color:var(--accent); }
.is-3d .page-companion { display:none; }
.page-companion { position:absolute; top:72px; left:16px; right:16px; bottom:128px; display:flex; align-items:center; justify-content:center; }
.book { display:flex; position:relative; width:var(--sheet-size); filter:drop-shadow(0 12px 18px #0002); }
.book.is-spread { width:calc(var(--sheet-size) * 2); }
.album-page { position:relative; flex:0 0 var(--sheet-size); width:var(--sheet-size); aspect-ratio:3/4; background:var(--paper); overflow:hidden; }
.page-artwork { display:block; width:100%; height:100%; object-fit:contain; }
.photo-button { display:block; width:100%; height:100%; min-width:44px; min-height:44px; border:0; background:transparent; padding:0; cursor:zoom-in; }
.photo-button:focus-visible { outline-offset:-4px; }
.page-content { padding:20px; }
.photo-gallery img { display:block; max-width:100%; max-height:100%; }
.is-fallback { --sheet-size:min(600px,calc((var(--reader-width) - 32px) / 2),calc((var(--reader-height) - 200px) * .75)); }
.is-fallback #book3d-stage { display:none; }
.loading,.error { padding:24px; text-align:center; font-size:14px; }
.photo-dialog { position:fixed; left:50%; top:50%; margin:0; transform:translate(-50%,-50%); width:min(1440px,calc(var(--reader-width) - 24px)); height:calc(var(--reader-height) - 24px); max-width:none; max-height:none; padding:12px; border:1px solid var(--line); color:var(--ink); background:var(--paper); overflow:hidden; }
.photo-dialog::backdrop { background:#1b211be6; }
.zoom-toolbar { display:flex; align-items:center; justify-content:space-between; gap:12px; min-height:44px; margin-bottom:8px; }
.zoom-toolbar p { margin:0; font-size:14px; line-height:1.5; }
.zoom-toolbar button { flex-shrink:0; }
.originals-dialog .zoom-toolbar { margin-bottom:16px; }
.originals-dialog h2 { margin:0 0 4px; font-family:"Songti SC","STSong",serif; font-size:24px; font-weight:500; }
.originals-dialog .zoom-toolbar p { color:var(--muted); font-size:13px; }
.originals-grid { height:calc(100% - 76px); overflow:auto; overscroll-behavior:contain; display:grid; grid-template-columns:repeat(auto-fill,minmax(170px,1fr)); grid-auto-rows:200px; gap:16px; align-content:start; padding:4px; touch-action:pan-x pan-y; }
.original-card { display:flex; flex-direction:column; gap:8px; min-width:0; height:200px; border:1px solid var(--line); border-radius:4px; background:#fff5; padding:8px; text-align:left; }
.original-card:hover { background:#fff; border-color:var(--muted); }
.original-card:active { background:#dddccc; }
.original-card img { display:block; width:100%; height:128px; object-fit:contain; background:#e8e5df; flex-shrink:0; }
.original-card span { display:block; font-size:13px; line-height:1.5; }
.zoom-controls { display:flex; align-items:center; justify-content:center; gap:8px; height:44px; margin-bottom:8px; }
.zoom-controls button { min-width:44px; min-height:44px; padding:0 12px; border:1px solid var(--line); background:#fff8; border-radius:4px; }
#zoom-level { width:52px; font-size:13px; text-align:center; }
.zoom-viewport { width:100%; height:calc(100% - 104px); overflow:hidden; display:flex; align-items:center; justify-content:center; touch-action:none; cursor:grab; }
.zoom-viewport:active { cursor:grabbing; }
#zoom-photo { display:block; width:100%; height:100%; object-fit:contain; flex-shrink:0; user-select:none; transform-origin:center; }
.is-sideways .reader { inset:auto; top:0; left:100%; transform:rotate(90deg); transform-origin:top left; }
.is-sideways .reader-controls { bottom:max(64px,calc(env(safe-area-inset-left) + 56px)); }
.is-sideways .page-actions { bottom:max(8px,env(safe-area-inset-left)); left:max(16px,env(safe-area-inset-top)); right:max(16px,env(safe-area-inset-bottom)); }
.is-sideways .photo-dialog { transform:translate(-50%,-50%) rotate(90deg); }
@media (max-height:500px),(max-width:760px) {
  .album-title { top:max(12px,env(safe-area-inset-top)); font-size:19px; }
  .originals-dialog h2 { font-size:20px; }
  .originals-grid { grid-template-columns:repeat(auto-fill,minmax(150px,1fr)); gap:12px; }
  .photo-action { max-width:210px; font-size:12px; padding:8px; }
  .zoom-toolbar p { font-size:12px; }
  .zoom-toolbar button { font-size:12px; padding:0 12px; }
}
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { transition:none!important; animation:none!important; } }

.load-feedback {position:absolute;z-index:3;top:50px;left:50%;transform:translateX(-50%);text-align:center;font-size:13px;color:var(--ink);background:var(--desk);max-width:90%;}
.load-feedback:has(#load-status:empty){display:none;}
.load-feedback button,.image-feedback button {min-width:44px;min-height:44px;padding:8px 12px;margin-left:8px;border:1px solid var(--line);background:var(--paper);border-radius:4px;}
.image-feedback {position:absolute;z-index:2;top:50%;left:50%;transform:translate(-50%,-50%);font-size:14px;text-align:center;}