:root {
    --paper: #EDEAE2;
    --paper-warm: #F5F2EB;
    --ink: #1B1E27;
    --ink-soft: #4A4A45;
    --muted: #8A8578;
    --rule: #C9C3B5;
    --border: #C9C3B5;
    --accent: #2F5CFF;
    --accent-soft: #E4E9FF;
    --accent-dim: #6B8AFA;
    --card: #FFFFFF;
    --badge-ai: #6B4FBB;
    --badge-ai-soft: #EEEAF7;
    --cobalt: #2F5CFF;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.7;
    font-size: 1.05rem;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: 'Fraunces', Georgia, serif; line-height: 1.3; }
.container { max-width: 52rem; margin: 0 auto; padding: 2rem 1.5rem; }
.btn {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    border: 1px solid var(--accent);
    border-radius: 4px;
    color: var(--accent);
    font-size: 0.95rem;
    cursor: pointer;
    background: transparent;
    transition: all 0.15s;
}
.btn:hover { background: var(--accent); color: #fff; text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #1a40d0; }
.btn-danger { border-color: #c0392b; color: #c0392b; }
.btn-danger:hover { background: #c0392b; color: #fff; }
.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}
.card h2 { font-size: 1.3rem; margin-bottom: 0.5rem; }
.card h2 a { color: var(--ink); }
.card h2 a:hover { color: var(--cobalt); }
.card .meta { font-size: 0.85rem; color: #888; margin-top: 0.5rem; }
.card .abstract { font-size: 0.95rem; color: #555; margin-top: 0.5rem; }
.card .subjects { margin-top: 0.5rem; }
.card .subjects a {
    font-size: 0.8rem;
    background: var(--muted);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    margin-right: 0.3rem;
    color: var(--ink);
}
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.3rem; font-size: 0.9rem; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    background: #fff;
}
.form-group textarea { min-height: 6rem; resize: vertical; }
.form-group .hint { font-size: 0.8rem; color: #888; margin-top: 0.2rem; }
.form-group input[type="file"] { padding: 0.3rem; }
.status-badge {
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: 3px;
    font-size: 0.8rem;
    font-weight: 600;
}
.status-pending { background: #fff3cd; color: #856404; }
.status-published { background: #d4edda; color: #155724; }
.status-rejected { background: #f8d7da; color: #721c24; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 1.2rem; text-align: center; }
.stat-card .num { font-size: 2rem; font-family: 'Fraunces', Georgia, serif; font-weight: 700; }
.stat-card .label { font-size: 0.85rem; color: #888; margin-top: 0.3rem; }
.subject-cloud { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.subject-cloud a {
    background: #fff;
    border: 1px solid var(--border);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    color: var(--ink);
}
.subject-cloud a:hover { border-color: var(--cobalt); color: var(--cobalt); }
.empty { text-align: center; padding: 3rem; color: #888; }
.empty h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.error { background: #f8d7da; color: #721c24; padding: 0.8rem 1rem; border-radius: 4px; margin-bottom: 1rem; }
.success { background: #d4edda; color: #155724; padding: 0.8rem 1rem; border-radius: 4px; margin-bottom: 1rem; }
.author-info { display: flex; gap: 1rem; align-items: center; margin-bottom: 1.5rem; }
.author-info .name { font-size: 1.3rem; font-family: 'Fraunces', Georgia, serif; }
.author-info .orcid { font-size: 0.85rem; color: var(--cobalt); }
.author-info .orcid a { color: var(--cobalt); }
.pagination { display: flex; gap: 0.5rem; justify-content: center; margin-top: 2rem; }
.pagination a, .pagination span {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.9rem;
}
.pagination .current { background: var(--cobalt); color: #fff; border-color: var(--cobalt); }
footer { border-top: 1px solid var(--border); padding: 1.5rem; text-align: center; font-size: 0.85rem; color: #888; margin-top: 3rem; }

/* OECD classification tags */
.oecd-tag {
    display: inline-block;
    padding: 0.15rem 0.45rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 500;
    font-family: 'IBM Plex Sans', sans-serif;
    margin: 0.15rem;
    white-space: nowrap;
    cursor: default;
    border: 1px solid;
    position: relative;
}
.oecd-tag::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 130%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--ink);
    color: #fff;
    padding: 0.35rem 0.6rem;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 400;
    white-space: normal;
    width: max-content;
    max-width: 220px;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 10;
}
.oecd-tag:hover::after,
.oecd-tag:focus::after {
    opacity: 1;
}

/* Paper cards (used on browse and splash pages) */
.paper-card { background: var(--card); border: 1px solid var(--rule); border-radius: 6px; padding: 1.4rem 1.5rem; margin: 1rem 0; }
.paper-card .paper-meta { font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; color: var(--muted); margin-bottom: 0.5rem; }
.paper-card h4, .paper-card h2 { font-family: 'Fraunces', serif; font-weight: 500; font-size: 1.15rem; margin: 0 0 0.4rem; line-height: 1.3; }
.paper-card h4 a, .paper-card h2 a { color: var(--ink); text-decoration: none; }
.paper-card h4 a:hover, .paper-card h2 a:hover { color: var(--accent); }
.paper-card .paper-authors { font-size: 0.9rem; color: var(--ink-soft); margin: 0 0 0.6rem; }
.paper-card .paper-abstract { font-size: 0.92rem; color: var(--ink-soft); margin: 0 0 0.8rem; }
.paper-card .paper-badges { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.5rem; }
.paper-card .paper-tags { margin-top: 0.4rem; }
.badge { font-size: 0.75rem; font-weight: 500; padding: 0.2rem 0.6rem; border-radius: 3px; }
.badge-ai { background: var(--badge-ai-soft); color: var(--badge-ai); }
.badge-format { background: var(--accent-soft); color: var(--accent); }
.badge-status { background: var(--paper-warm); color: var(--muted); border: 1px solid var(--rule); }