/**
 * Shared styles for publication listing pages (books, articles, cases).
 * Used by content-all-books.php, content-research-articles.php, content-all-cases.php.
 */

/* ── Year Tab Navigation ──────────────────────────────────────────────────── */

.pub-year-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid #e5e5e5;
    flex-wrap: wrap;
}

.pub-year-tab {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: #6c757d;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    bottom: -2px;
}

.pub-year-tab:hover {
    color: #0056b3;
    background: rgba(0, 86, 179, 0.05);
}

.pub-year-tab:focus {
    outline: none;
}

.pub-year-tab.active {
    color: #0056b3;
    border-bottom-color: #ff6b35;
    background: transparent;
}

@media (max-width: 768px) {
    .pub-year-tabs {
        gap: 0.5rem;
    }

    .pub-year-tab {
        padding: 0.75rem 1rem;
        font-size: 1rem;
        flex: 1 1 auto;
        text-align: center;
    }
}

/* ── Year Content Containers ──────────────────────────────────────────────── */

.pub-year-container {
    display: none;
}

.pub-year-container.active {
    display: block;
}

/* ── Publication List Grid ────────────────────────────────────────────────── */

.pub-list {
    display: grid;
    gap: 2rem;
}

.pub-list-item {
    padding-bottom: 1rem;
    border-bottom: 1px solid #e5e5e5;
}

@media (min-width: 768px) {
    .pub-list {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ── Empty State ──────────────────────────────────────────────────────────── */

.pub-empty-state {
    text-align: center;
    padding: 3rem 0;
    color: #6c757d;
}

.pub-empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}