:root {
  --bg:#f6f5f1; --fg:#2a2a2a; --card:#fff; --muted:#8a8a8a; --line:#e3e0d8;
  --accent:#8a7; --bar:#fff;
}
[data-theme="dark"] {
  --bg:#181818; --fg:#cbc6bb; --card:#242424; --muted:#7f7f7f; --line:#333;
  --accent:#8a6; --bar:#202020;
}
* { box-sizing:border-box; }
html,body { margin:0; padding:0; }
body { background:var(--bg); color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif; }

.topbar { position:sticky; top:0; z-index:20; display:flex; align-items:center; gap:10px;
  padding:10px 14px; background:var(--bar); border-bottom:1px solid var(--line); }
.brand { font-size:17px; margin:0; font-weight:600; flex:1;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.actions { display:flex; gap:6px; }
.icon-btn { background:transparent; border:1px solid var(--line); color:var(--fg);
  border-radius:8px; padding:6px 10px; font-size:15px; cursor:pointer; text-decoration:none; line-height:1; }
.icon-btn:hover { border-color:var(--accent); }

/* shelf */
.shelf { max-width:900px; margin:0 auto; padding:16px;
  display:grid; grid-template-columns:repeat(auto-fill,minmax(160px,1fr)); gap:14px; }
.book-card { display:flex; gap:10px; align-items:center; background:var(--card);
  border:1px solid var(--line); border-radius:12px; padding:12px; text-decoration:none; color:var(--fg); }
.book-card:hover { border-color:var(--accent); }
.cover { width:42px; height:54px; flex:none; display:flex; align-items:center; justify-content:center;
  font-size:22px; font-weight:700; color:#fff; background:linear-gradient(135deg,#9b8,#675); border-radius:6px; }
.bt { font-weight:600; font-size:15px; }
.bc { color:var(--muted); font-size:13px; margin-top:3px; }
.hint { color:var(--muted); text-align:center; padding:40px; }

/* reader */
.reader { max-width:720px; margin:0 auto; padding:24px 20px 80px; }
.chap-title { font-size:20px; margin:8px 0 18px; }
.chap-content p { margin:0 0 1em; text-align:justify; }
.chap-nav { display:flex; align-items:center; justify-content:space-between; margin-top:34px; gap:10px; }
.chap-nav button { background:var(--card); border:1px solid var(--line); color:var(--fg);
  border-radius:8px; padding:8px 14px; cursor:pointer; }
.chap-nav button:hover { border-color:var(--accent); }
#chapPos { color:var(--muted); font-size:13px; }

/* drawers & panels */
.drawer,.panel { position:fixed; top:0; z-index:30; background:var(--bar);
  height:100%; transition:transform .2s ease; overflow:auto; }
.drawer { left:0; width:80%; max-width:320px; border-right:1px solid var(--line); transform:translateX(-100%); }
.drawer.open { transform:translateX(0); }
.drawer-head { padding:14px; font-weight:600; border-bottom:1px solid var(--line);
  position:sticky; top:0; background:var(--bar); }
#tocList { list-style:none; margin:0; padding:0; }
#tocList li { padding:11px 14px; border-bottom:1px solid var(--line); cursor:pointer; }
#tocList li:hover { background:var(--bg); }
#tocList li.active { color:var(--accent); font-weight:600; }
.panel { right:0; width:80%; max-width:300px; border-left:1px solid var(--line);
  transform:translateX(100%); padding:18px; display:flex; flex-direction:column; gap:18px; }
.panel.open { transform:translateX(0); }
.panel label { display:flex; flex-direction:column; gap:8px; font-size:14px; }
.panel input[type=range] { width:100%; }
.panel select { padding:6px; background:var(--card); color:var(--fg);
  border:1px solid var(--line); border-radius:6px; }
.overlay { position:fixed; inset:0; background:rgba(0,0,0,.4); z-index:25; display:none; }
.overlay.show { display:block; }

@media (max-width:600px){ .reader{ padding:18px 16px 80px; } }