:root {
  --bg: #0b0c10;
  --panel: #151821;
  --text: #e8eef2;
  --muted: #a8b3bd;
  --border: #263043;
  --accent: #4da3ff;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial;
       background: linear-gradient(180deg, #0a0d14, #0b0c10); color: var(--text); }
.site-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .75rem 1rem; background: rgba(11,12,16,.8); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.brand { color: var(--text); text-decoration: none; font-weight: 700; }
.nav { display: flex; gap: .5rem; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--muted); border: 1px solid var(--border);
         padding: .25rem .5rem; border-radius: .4rem; }
.nav a.active, .nav a:hover { color: var(--text); border-color: var(--accent); }
.app { padding: 1rem; display: grid; gap: 1rem; }
.card-view { display: grid; gap: .75rem; }
.toolbar { display: flex; gap: .5rem; align-items: center; }
.btn {
  text-decoration: none; color: var(--muted); border: 1px solid var(--border);
  padding: .4rem .7rem; border-radius: .5rem; background: #0f1320; cursor: pointer;
}
.btn:hover { color: var(--text); border-color: var(--accent); }
.pdf-frame { width: 100%; height: calc(100vh - 180px); border: 1px solid var(--border);
             border-radius: .6rem; background: #0e1320; }
.list { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: .5rem; }
.list a { text-decoration: none; color: var(--muted); border: 1px dashed var(--border);
          padding: .5rem .75rem; border-radius: .5rem; background: #0f1320; text-align: center; }
.list a:hover { color: var(--text); border-color: var(--accent); }
footer { padding: 1rem; color: var(--muted); text-align: center; }