* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  height: 100vh;
  overflow: hidden;
}

body[data-theme="light"] { --bg: #ffffff; --fg: #1a1a1a; --panel: #f2f2f2; --accent: #2563eb; --border: #ddd; }
body[data-theme="dark"] { --bg: #121212; --fg: #e8e8e8; --panel: #1e1e1e; --accent: #60a5fa; --border: #333; }
body[data-theme="sepia"] { --bg: #f4ecd8; --fg: #3b2f1e; --panel: #ece0c4; --accent: #8a5a2b; --border: #d8c9a3; }

body { background: var(--bg); color: var(--fg); }

.hidden { display: none !important; }
.screen { height: 100%; }

.login-card {
  max-width: 320px;
  margin: 15vh auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: var(--panel);
  border-radius: 12px;
}
.login-card input, .login-card button, select {
  padding: 10px;
  font-size: 15px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
}
.login-card button, .top-bar button, .icon-btn {
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  border: none;
}
.error { color: #dc2626; min-height: 1.2em; margin: 0; }

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}
.top-bar-actions { display: flex; gap: 10px; }
.upload-btn, .secondary {
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  padding: 24px;
  overflow-y: auto;
  height: calc(100% - 64px);
}
.doc-card {
  background: var(--panel);
  border-radius: 10px;
  padding: 16px;
  cursor: pointer;
  border: 1px solid var(--border);
}
.doc-card h3 { margin: 0 0 8px; font-size: 15px; word-break: break-word; }
.doc-card .progress-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin-top: 8px; }
.doc-card .progress-fill { height: 100%; background: var(--accent); }
.doc-card .delete-btn { float: right; background: none; border: none; color: #dc2626; cursor: pointer; }

.reader-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
#reader-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reader-controls { display: flex; align-items: center; gap: 8px; }
.icon-btn { padding: 6px 12px; border-radius: 6px; font-size: 16px; }
.page-input { width: 52px; text-align: center; padding: 6px; border-radius: 6px; border: 1px solid var(--border); background: var(--bg); color: var(--fg); }
.speed-label { font-size: 12px; opacity: 0.75; min-width: 52px; }
#autoscroll-speed { accent-color: var(--accent); }
.icon-btn.active { outline: 2px solid var(--accent); }

.pdf-container {
  height: calc(100% - 52px);
  overflow-y: auto;
  display: flex;
  justify-content: center;
  padding: 24px;
}
#pdf-page-wrap { position: relative; }
#pdf-canvas { display: block; box-shadow: 0 2px 12px rgba(0,0,0,0.2); }
#highlight-canvas { position: absolute; top: 0; left: 0; pointer-events: none; }