.reader {
  position: relative;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--surface-subtle);
}

.doc-status {
  position: absolute;
  top: var(--space-3);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-sticky);
  max-width: min(80%, 520px);
  padding: 6px 12px;
  background: var(--surface-floating);
  color: var(--ink);
  font: 400 13px/18px var(--font-sans);
  border-radius: var(--radius-full);
  box-shadow: var(--material-menu);
  text-align: center;
}

.viewport {
  flex: 1;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  position: relative;
}

.pages {
  display: flex;
  flex-direction: column;
  align-items: center;
  align-items: safe center;
  width: fit-content;
  min-width: 100%;
  gap: var(--page-gap);
  padding: var(--page-gap) var(--reader-gutter) var(--space-24);
  min-height: 100%;
}
.pages:empty { display: none; }

.page {
  position: relative;
  flex-shrink: 0;
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--material-medium);
  overflow: hidden;
}
.page:not(.ready)::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--surface);
}
.page canvas { display: block; position: absolute; inset: 0; }
.page .textLayer { z-index: 2; }
.page .textLayer ::selection { background: var(--selection); }

.pages.html { padding-top: calc(var(--page-gap) * 2); }
.paper {
  --paper-zoom: 1;
  width: var(--paper-w);
  max-width: 100%;
  padding: calc(var(--paper-pad) * var(--paper-zoom)) calc(var(--paper-pad) * var(--paper-zoom) * 1.05);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--material-medium);
  font-family: var(--font-read);
  font-size: calc(17px * var(--paper-zoom));
  line-height: 1.75;
  color: var(--ink);
  overflow-wrap: anywhere;
}
.paper .doc-page { position: relative; }
.paper .doc-page + .doc-page { margin-top: 2.5em; padding-top: 2.5em; border-top: 1px solid var(--border); }

.paper p, .paper li, .paper blockquote, .paper pre, .paper table, .paper figure, .paper dl { margin: 0 0 1em; }
.paper h1 { font: 500 1.85em/1.2 var(--font-read); letter-spacing: -0.025em; margin: 0 0 .7em; }
.paper h2 { font: 500 1.4em/1.3 var(--font-read); letter-spacing: -0.02em; margin: 1.7em 0 .5em; }
.paper h3 { font: 500 1.15em/1.4 var(--font-read); letter-spacing: -0.01em; margin: 1.5em 0 .4em; }
.paper h4, .paper h5, .paper h6 { font: 500 1em/1.5 var(--font-read); margin: 1.3em 0 .3em; }
.paper blockquote { border-left: 2px solid var(--border-strong); padding-left: 1.1em; color: var(--ink-muted); font-style: italic; }
.paper pre { font-family: var(--font-mono); font-size: .82em; line-height: 1.6; background: var(--surface-hover); padding: 1em 1.2em; border-radius: var(--radius-md); overflow-x: auto; }
.paper code { font-family: var(--font-mono); font-size: .88em; background: var(--surface-hover); padding: .1em .35em; border-radius: var(--radius-sm); }
.paper pre code { background: none; padding: 0; font-size: 1em; }
.paper img { max-width: 100%; height: auto; display: block; margin: 1.4em auto; border-radius: var(--radius-md); }
.paper table { border-collapse: collapse; width: 100%; font: 400 .88em/1.5 var(--font-sans); }
.paper td, .paper th { border: 1px solid var(--border); padding: .5em .7em; text-align: left; vertical-align: top; }
.paper th { background: var(--surface-hover); font-weight: 500; }
.paper hr { border: 0; border-top: 1px solid var(--border); margin: 2.4em 0; }
.paper ul, .paper ol { padding-left: 1.4em; }
.paper a { color: var(--link); }
.paper .subtitle { color: var(--ink-muted); font-size: 1.08em; margin-top: -.5em; }

.paper .trans {
  font: 400 .9em/1.75 var(--font-sans);
  color: var(--ink-muted);
  background: var(--surface-subtle);
  border-left: 2px solid var(--blue-400);
  padding: .55em .9em;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: -.3em 0 1.1em;
  user-select: none;
}
.paper.hide-trans .trans { display: none; }

.hl-layer { position: absolute; inset: 0; pointer-events: none; z-index: 1; }
.paper .hl-layer { z-index: 0; }
.paper .doc-page > *:not(.hl-layer) { position: relative; z-index: 1; }

.hl-mark {
  position: absolute;
  background: var(--hl-sentence);
  border-radius: 2px;
  mix-blend-mode: multiply;
  transition: background .15s;
}
.hl-mark.word { background: var(--hl-word); }
.hl-mark.active { background: var(--hl-active); }
.hl-outline {
  position: absolute;
  border: 1.5px solid var(--hl-outline);
  border-radius: 3px;
  background: var(--blue-100);
  mix-blend-mode: multiply;
}

.welcome { min-height: 100%; display: grid; place-items: center; padding: var(--space-10) var(--reader-gutter); }
.welcome-card { width: 100%; max-width: 520px; text-align: center; }
.welcome-logo {
  width: 56px; height: 56px;
  margin: 0 auto var(--space-5);
  display: grid; place-items: center;
  border-radius: var(--radius-lg);
  background: var(--primary);
  color: var(--on-primary);
  font: 500 26px/1 var(--font-read);
}
.welcome h1 { font: 500 32px/40px var(--font-sans); letter-spacing: -0.025em; margin-bottom: var(--space-3); }
.welcome-lead { font: 400 16px/24px var(--font-sans); color: var(--ink-muted); margin-bottom: var(--space-6); }
.welcome-actions { display: flex; gap: var(--space-2); justify-content: center; margin-bottom: var(--space-4); flex-wrap: wrap; }
.welcome-actions button:not(.primary) { height: var(--h-md); padding: 0 var(--space-4); }
.recent-mini { margin-top: var(--space-10); text-align: left; }
.recent-mini .library { max-height: 40vh; overflow-y: auto; }

.drop-hint {
  position: absolute;
  inset: var(--space-3);
  z-index: var(--z-overlay);
  display: grid;
  place-items: center;
  border: 2px dashed var(--focus-ring);
  border-radius: var(--radius-lg);
  background: var(--blue-100);
  color: var(--blue-1000);
  font: 500 16px/24px var(--font-sans);
  pointer-events: none;
}

@media (max-width: 639px) {
  .paper { border-radius: var(--radius-md); }
  .welcome h1 { font-size: 26px; line-height: 32px; }
  .welcome-lead { font-size: 15px; }
}