:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #171717;
  background: #f4f4f5;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: #1d4ed8; }
.topbar {
  height: 54px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: #18181b;
  color: white;
}
.brand { color: white; text-decoration: none; font-weight: 650; }
.release {
  margin-left: auto;
  color: #a1a1aa;
  font-family: ui-monospace, monospace;
  font-size: 12px;
}
#app { min-height: calc(100vh - 54px); }
.home { max-width: 1100px; margin: 0 auto; padding: 28px 20px 60px; }
.home h1 { margin-top: 0; }
.search {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #d4d4d8;
  border-radius: 8px;
  font-size: 16px;
  background: white;
}
.source-list { display: grid; gap: 10px; margin-top: 18px; }
.source-card {
  display: block;
  padding: 14px 16px;
  color: inherit;
  text-decoration: none;
  background: white;
  border: 1px solid #e4e4e7;
  border-radius: 8px;
}
.source-card:hover { border-color: #a1a1aa; }
.source-id {
  margin-top: 6px;
  color: #71717a;
  font-family: ui-monospace, monospace;
  font-size: 12px;
}
.viewer-layout {
  min-height: calc(100vh - 54px);
  display: grid;
  grid-template-rows: auto 1fr;
}
.metadata {
  padding: 14px 18px;
  background: white;
  border-bottom: 1px solid #d4d4d8;
}
.metadata h1 { margin: 0 0 8px; font-size: 18px; }
.meta-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 13px;
  color: #3f3f46;
}
.meta-grid strong { color: #18181b; }
.actions { margin-top: 10px; display: flex; gap: 10px; flex-wrap: wrap; }
.button {
  padding: 6px 10px;
  border: 1px solid #d4d4d8;
  border-radius: 6px;
  background: #fafafa;
  color: #18181b;
  text-decoration: none;
  font-size: 13px;
}
.pdf-frame, .file-frame {
  width: 100%;
  height: 100%;
  min-height: 70vh;
  border: 0;
  background: #525659;
}
.empty { padding: 40px 20px; text-align: center; color: #71717a; }
.error {
  max-width: 760px;
  margin: 40px auto;
  padding: 20px;
  background: #fee2e2;
  border-radius: 8px;
}
@media (max-width: 700px) {
  .topbar { padding: 0 12px; }
  .metadata { padding: 12px; }
}