* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  color: #222;
  background: #fafafa;
}
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 20px; background: #1a1a2e; color: white;
}
header h1 { margin: 0; font-size: 20px; }
#progress { font-size: 13px; opacity: 0.85; }
main { display: flex; min-height: calc(100vh - 56px); }
#sidebar {
  width: 280px; padding: 16px; background: white; border-right: 1px solid #e0e0e0;
  display: flex; flex-direction: column; gap: 14px;
  position: sticky; top: 0; align-self: flex-start; max-height: 100vh; overflow-y: auto;
}
#sidebar input[type=search], #sidebar select {
  width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px; font-size: 14px;
}
fieldset { border: 1px solid #e0e0e0; border-radius: 4px; padding: 8px 12px; margin: 0; }
fieldset legend { font-size: 13px; color: #666; padding: 0 4px; }
fieldset label { display: block; font-size: 14px; padding: 2px 0; cursor: pointer; }
#results { flex: 1; padding: 16px 24px; }
#results ul { list-style: none; padding: 0; margin: 0; }
#results li { margin-bottom: 12px; }
#results li a {
  display: block; padding: 14px 16px; background: white;
  border: 1px solid #e0e0e0; border-radius: 6px;
  color: inherit; text-decoration: none;
}
#results li a:hover { border-color: #4a90e2; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.title { font-weight: 600; font-size: 15px; margin-bottom: 4px; line-height: 1.4; }
.meta { color: #888; font-size: 12px; }
.authors { color: #555; font-size: 13px; margin: 4px 0; }
.abstract { font-size: 13px; color: #444; line-height: 1.5; margin-top: 6px; }
.hint { color: #888; padding: 24px 0; text-align: center; }
.summary-bar { color: #666; font-size: 13px; margin-bottom: 12px; }
#quick-keywords { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 10px; }
#quick-keywords legend { width: 100%; padding: 0 4px 4px; }
#quick-keywords button {
  background: #f0f4f8; border: 1px solid #d0dae3; color: #345;
  border-radius: 12px; padding: 3px 10px; font-size: 12px; cursor: pointer;
}
#quick-keywords button:hover { background: #e0e8f0; border-color: #4a90e2; }