:root{
  --bg: #0b0c10;
  --panel: #12131a;
  --text: #eaeaf2;
  --muted: #a6a7b3;
  --card: #151827;
  --border: rgba(255,255,255,.12);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 16px;

  --page-bg: #10121a;
  --page-text: #f2f2f7;

  --fontScale: 1;
}

[data-theme="light"]{
  --bg: #f7f7fb;
  --panel: #ffffff;
  --text: #14151a;
  --muted: #5b5f6b;
  --card: #ffffff;
  --border: rgba(0,0,0,.10);
  --shadow: 0 10px 30px rgba(0,0,0,.10);

  --page-bg: #ffffff;
  --page-text: #1a1b20;
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: var(--bg);
  color: var(--text);
}

/* Top bars */
.topbar, .readerbar{
  position: sticky;
  top: 0;
  z-index: 10;
  display:flex;
  align-items:center;
  gap: 12px;
  padding: 12px 14px;
  background: color-mix(in oklab, var(--panel) 92%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.app-title{
  margin:0;
  font-size: 18px;
  letter-spacing: .2px;
}

.topbar-right{ margin-left:auto; }

.readerbar-center{
  flex: 1;
  min-width: 0;
  text-align:center;
}
.reader-title{
  font-weight: 650;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.reader-meta{
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}
.readerbar-right{
  display:flex;
  gap: 8px;
}

/* Buttons */
.btn{
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration:none;
  box-shadow: 0 1px 0 rgba(255,255,255,.04) inset;
}
.btn.subtle{
  background: transparent;
}
.btn:hover{ filter: brightness(1.05); }
.btn:active{ transform: translateY(1px); }

/* Library */
.library{
  padding: 18px;
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}

.book-card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow:hidden;
  box-shadow: var(--shadow);
  cursor:pointer;
  display:flex;
  flex-direction:column;
  min-height: 260px;
}

.cover{
  aspect-ratio: 2 / 3;
  width:100%;
  background: linear-gradient(135deg, rgba(255,255,255,.08), rgba(255,255,255,.02));
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
}
.cover img{
  width:100%;
  height:100%;
  object-fit: cover;
  display:block;
}
.book-info{
  padding: 12px;
  display:flex;
  flex-direction:column;
  gap: 6px;
}
.book-title{
  font-weight: 700;
  line-height: 1.2;
}
.book-author{
  color: var(--muted);
  font-size: 13px;
}

.progress-pill{
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
}

/* Reader pages */
.reader{ height: calc(100vh - 58px); }
.pages{
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  display:flex;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.page{
  scroll-snap-align: start;
  flex: 0 0 100vw;
  height: 100%;
  padding: 22px 16px 28px;
  display:flex;
  justify-content:center;
  align-items:flex-start;
}

.page-inner{
  width: min(820px, 100%);
  height: 100%;
  background: var(--page-bg);
  color: var(--page-text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 20px 18px;
  overflow-y: auto;
  font-size: calc(16px * var(--fontScale));
  line-height: 1.65;
}

.page-inner h2, .page-inner h3{
  line-height: 1.25;
}
.page-label{
  color: color-mix(in oklab, var(--page-text) 65%, transparent);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* Footnotes */
.fn-ref{
  font-size: 0.8em;
  vertical-align: super;
  padding: 0 2px;
  cursor:pointer;
  color: color-mix(in oklab, var(--page-text) 80%, transparent);
  text-decoration: underline;
}

.footnotes{
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed color-mix(in oklab, var(--border) 80%, transparent);
  color: color-mix(in oklab, var(--page-text) 80%, transparent);
  font-size: 0.92em;
}
.footnote{ margin: 8px 0; }

.fn-overlay{
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 18px;
}
.fn-card{
  width: min(720px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.fn-card-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.fn-card-content{
  padding: 14px;
  color: var(--text);
}

/* Misc */
.loading{
  padding: 20px;
  color: var(--muted);
}
.dot{ opacity:.6; padding: 0 6px; }