:root {
    --bg: #FAF9F3;
    --panel: #ECE9E2;
    --ink: #000000;
    --accent-yellow: #E9ED4C;
    --accent-orange: #FF9400;
    --accent-green: #75A025;
    --accent-blue: #0279EE;
    --accent-pink: #FD9BED;
    --muted: #555;
}

* { box-sizing: border-box; }
body {
    font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--ink);
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

header { padding: 20px 32px 12px; border-bottom: 2px solid var(--ink); }
header h1 { margin: 0; font-size: 26px; font-weight: 700; }
header .sub { font-weight: 400; color: var(--muted); font-size: 17px; }
header .tagline { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.filterbar {
    display: flex; gap: 14px; padding: 12px 32px;
    background: var(--panel); border-bottom: 1px solid #ccc;
    flex-wrap: wrap; align-items: flex-end;
}
.filter-group { display: flex; flex-direction: column; gap: 4px; }
.filter-group label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.4px; }
.filter-group select, .filter-group input, .filter-group button {
    padding: 6px 10px; border: 1px solid #999; background: var(--bg);
    border-radius: 0; font-size: 14px; min-width: 140px; font-family: inherit;
}
.filter-group.searchbox { flex: 1; min-width: 240px; }
.filter-group.searchbox input { width: 100%; }
.filter-group button {
    cursor: pointer; background: var(--ink); color: white;
    border: 1px solid var(--ink); min-width: 0;
}
.filter-group button:hover { background: var(--accent-blue); border-color: var(--accent-blue); }

#stats {
    padding: 8px 32px; background: var(--bg); font-size: 13px;
    color: var(--muted); border-bottom: 1px dashed #ccc;
}

main#results {
    padding: 16px 32px 48px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 16px;
}

.card {
    border: 1px solid #ddd; background: white; padding: 14px 16px;
    border-radius: 0; position: relative;
}
.card .meta { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.card h3 { margin: 0 0 8px; font-size: 15px; font-weight: 600; line-height: 1.35; }
.card h3 a { color: var(--ink); text-decoration: none; }
.card h3 a:hover { color: var(--accent-blue); text-decoration: underline; }
.card .authors { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.card .abstract { font-size: 13px; color: #333; }
.card .badges { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 5px; }
.badge {
    font-size: 11px; padding: 2px 7px; background: var(--panel);
    border: 1px solid #ccc; white-space: nowrap;
}
.badge.source-arxiv { background: var(--accent-yellow); }
.badge.source-biorxiv, .badge.source-medrxiv { background: #c4eb73; }
.badge.source-pubmed, .badge.source-europepmc { background: var(--accent-orange); color: white; }
.badge.source-openalex { background: var(--accent-pink); }
.badge.source-semanticscholar, .badge.source-s2 { background: #b5d8ff; }
.badge.source-openreview { background: #d4d4f0; }
.badge.source-github { background: #333; color: white; }
.badge.source-huggingface { background: #ffd21e; }
.badge.topic { background: white; border: 1px solid var(--accent-blue); color: var(--accent-blue); }

.card .links { margin-top: 8px; font-size: 12px; }
.card .links a { color: var(--accent-blue); text-decoration: none; margin-right: 12px; }
.card .links a:hover { text-decoration: underline; }

#sentinel { height: 40px; }

footer {
    padding: 16px 32px; border-top: 2px solid var(--ink);
    font-size: 12px; color: var(--muted); background: var(--panel);
}
footer a { color: var(--accent-blue); }