/* Research Page - SELAB@HKNU */

.research-page { scroll-behavior: smooth; }

.content-grid {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 40px;
    margin-top: 20px;
}

.content-section {
    margin-bottom: 60px;
    scroll-margin-top: 100px;
}
.research-page .section-header {
    margin-bottom: 24px;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 12px;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
}
.research-page .content-section .section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}
.section-desc {
    margin: 0;
    font-size: 0.95rem;
    color: var(--color-secondary);
}
.section-divider {
    border: 0;
    height: 1px;
    background: var(--color-border);
    margin: 40px 0;
}

/* Timeline */
.timeline-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.timeline-item {
    display: flex;
    gap: 20px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}
.timeline-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.timeline-marker {
    flex: 0 0 140px;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--color-accent);
    text-align: right;
    padding-top: 2px;
    border-right: 2px solid #eff6ff;
    padding-right: 20px;
    height: fit-content;
    white-space: nowrap;
}
.timeline-content { flex: 1; }
.timeline-title { font-size: 1.2rem; font-weight: 700; margin: 0 0 6px; }
.timeline-meta { font-size: 0.95rem; color: var(--color-secondary); margin: 0 0 16px; }

/* Tags */
.tag-group { display: flex; flex-wrap: wrap; gap: 8px; }
.research-page .tag-group .tag {
    display: inline-block;
    padding: 4px 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-secondary);
    background-color: var(--color-light-bg);
    border-radius: 6px;
}
.research-page .tag-group .tag--primary {
    background-color: #dbeafe;
    color: #1e40af;
}

/* Theme cards */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.theme-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}
.theme-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.1);
}
.theme-card__icon {
    width: 48px;
    height: 48px;
    background: #eff6ff;
    color: var(--color-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}
.theme-card__title { font-size: 1.15rem; font-weight: 700; margin: 0 0 4px; }
.theme-card__sub {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    margin: 0 0 10px;
    letter-spacing: 0.03em;
}
.theme-card__desc {
    font-size: 0.95rem;
    color: var(--color-text-sub);
    line-height: 1.5;
    margin: 0;
    flex-grow: 1;
}
.caps-container {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--color-border);
}
.cap {
    font-size: 0.75rem;
    color: var(--color-muted, #94a3b8);
    background: transparent;
    border: 1px solid var(--color-border);
    padding: 2px 8px;
    border-radius: 4px;
}

/* Sidebar */
.sidebar-column { position: relative; }
.sidebar-sticky-wrapper {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
/* NOTE: .widget-box duplicates .sidebar-box in main.css — consider consolidating */
.widget-box {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}
.widget-title {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--color-muted, #94a3b8);
    margin: 0 0 12px;
    font-weight: 700;
    letter-spacing: 0.05em;
}
.toc-nav { display: flex; flex-direction: column; gap: 8px; }
.toc-link {
    text-decoration: none;
    color: var(--color-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    transition: color 0.2s;
}
.toc-link:hover, .toc-link.active { color: var(--color-accent); font-weight: 700; }
.toc-link i { font-size: 0.8rem; }

.widget-box--info {
    background: #f0f9ff;
    border-color: #bae6fd;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}
.widget-box--info .info-icon { color: var(--color-accent); font-size: 1.2rem; margin-top: -2px; }
.widget-box--info p { margin: 0; font-size: 0.85rem; line-height: 1.5; color: #0c4a6e; }

@media (max-width: 992px) {
    .content-grid { grid-template-columns: 1fr; }
    .main-column { order: 1; }
    .sidebar-column { order: 2; margin-top: 40px; }
    .sidebar-sticky-wrapper { position: static; }
    .timeline-item { flex-direction: column; gap: 10px; }
    .timeline-marker {
        text-align: left;
        border-right: none;
        border-bottom: 2px solid #eff6ff;
        padding-bottom: 8px;
        width: 100%;
        flex-basis: auto;
    }
}

/* Category label on theme cards */
.theme-card__category {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 3px 8px;
    border-radius: 4px;
    background: #f0f9ff;
    color: #0369a1;
    margin-bottom: 8px;
    width: fit-content;
}

/* --- Flagship theme card (Multi-Agent) --- */
.section-badge {
    display: inline-block;
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    padding: 3px 10px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    border-radius: 999px;
    vertical-align: middle;
    margin-left: 10px;
    text-transform: uppercase;
}
.theme-card--flagship {
    position: relative;
    border: 2px solid #1a3a69 !important;
    background: linear-gradient(135deg, #fff, rgba(26, 58, 105, 0.025)) !important;
    box-shadow: 0 6px 20px rgba(26, 58, 105, 0.12) !important;
}
.theme-card--flagship::before {
    content: '★ FLAGSHIP';
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 0.6rem;
    font-weight: 800;
    padding: 3px 9px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    border-radius: 999px;
    letter-spacing: 0.08em;
    z-index: 1;
}
.theme-card--flagship .theme-card__icon {
    background: linear-gradient(135deg, #1a3a69, #2d5a9e) !important;
    color: #fff !important;
}
.theme-card--flagship .theme-card__category {
    background: linear-gradient(135deg, #1a3a69, #2d5a9e);
    color: #fff;
}