/*
 * ANCCER Research Hub — research.css
 * Styles for the research archive, category archive, and single article templates.
 * Consumes design tokens from anccer-theme/assets/css/tokens.css.
 */

/* ══════════════════════════════════════════════════════════════
   RESEARCH PAGE HEADER
   ══════════════════════════════════════════════════════════════ */

.research-page-header {
    margin-bottom: var(--space-6);
}

.research-page-header__eyebrow {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.research-page-header__eyebrow svg {
    flex-shrink: 0;
    color: var(--color-accent);
}

.research-page-header__title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    line-height: var(--leading-tight);
    margin: 0 0 var(--space-2);
}

.research-page-header__desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin: 0;
    line-height: var(--leading-relaxed);
}

/* ══════════════════════════════════════════════════════════════
   CANCER TYPE FILTER BAR (archive)
   ══════════════════════════════════════════════════════════════ */

.research-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.research-filter-tag {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    text-decoration: none;
    border: 1.5px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-muted);
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
}

.research-filter-tag:hover {
    background: var(--color-bg);
    color: var(--color-primary);
    border-color: var(--color-primary-light);
}

.research-filter-tag.is-active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH ARTICLE GRID (archive)
   ══════════════════════════════════════════════════════════════ */

.research-article-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
    margin-bottom: var(--space-8);
}

@media (min-width: 600px) {
    .research-article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH ARTICLE CARD
   ══════════════════════════════════════════════════════════════ */

.research-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
    text-decoration: none;
    color: inherit;
}

/* When used inside main-content card (md+), override the outer border */
@media (min-width: 768px) {
    .research-card {
        background: var(--color-bg);
    }
}

.research-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border-strong);
}

.research-card__image {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-bg);
    flex-shrink: 0;
}

.research-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-slow);
}

.research-card:hover .research-card__image img {
    transform: scale(1.03);
}

.research-card__image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: rgba(255, 255, 255, 0.3);
}

.research-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: var(--space-4);
    gap: var(--space-2);
}

.research-card__types {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.research-card__type-pill {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: var(--font-semibold);
    background: rgba(26, 58, 92, 0.08);
    color: var(--color-primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    transition: background var(--transition-fast);
}

.research-card__type-pill:hover {
    background: rgba(26, 58, 92, 0.16);
}

.research-card__title {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    line-height: var(--leading-snug);
    margin: 0;
}

.research-card:hover .research-card__title {
    color: var(--color-primary);
}

.research-card__excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.research-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: auto;
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border);
}

.research-card__date {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

/* ══════════════════════════════════════════════════════════════
   PAGINATION
   ══════════════════════════════════════════════════════════════ */

.research-pagination {
    display: flex;
    justify-content: center;
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.research-pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--space-2);
    margin: 0 2px;
    border-radius: var(--radius);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    text-decoration: none;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.research-pagination .page-numbers:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

.research-pagination .page-numbers.current {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.research-pagination .page-numbers.dots {
    border: none;
    cursor: default;
}

/* ══════════════════════════════════════════════════════════════
   EMPTY STATE
   ══════════════════════════════════════════════════════════════ */

.research-empty {
    text-align: center;
    padding: var(--space-12) var(--space-6);
    color: var(--color-text-muted);
}

.research-empty__icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-4);
    color: var(--color-border-strong);
}

.research-empty__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.research-empty p {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    max-width: 360px;
    margin: 0 auto;
}

/* ══════════════════════════════════════════════════════════════
   SINGLE ARTICLE
   ══════════════════════════════════════════════════════════════ */

.research-single__back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-primary);
    text-decoration: none;
    margin-bottom: var(--space-5);
    transition: color var(--transition-fast);
}

.research-single__back:hover {
    color: var(--color-primary-light);
}

.research-single__hero {
    width: 100%;
    aspect-ratio: 16 / 7;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    margin-bottom: var(--space-6);
}

.research-single__hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.research-single__hero-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: rgba(255, 255, 255, 0.25);
}

.research-single__types {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.research-single__type-pill {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(26, 58, 92, 0.08);
    color: var(--color-primary);
    text-decoration: none;
    transition: background var(--transition-fast);
}

.research-single__type-pill:hover {
    background: rgba(26, 58, 92, 0.16);
}

.research-single__title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    line-height: var(--leading-tight);
    margin: 0 0 var(--space-5);
}

@media (max-width: 768px) {
    .research-single__title {
        font-size: var(--text-2xl);
    }
}

/* Meta bar: authors / date / DOI / source */
.research-single__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
}

.research-single__meta-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    min-width: 120px;
}

.research-single__meta-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--color-text-subtle);
}

.research-single__meta-value {
    font-size: var(--text-sm);
    color: var(--color-text);
    line-height: var(--leading-snug);
    word-break: break-word;
}

.research-single__meta-value a {
    color: var(--color-primary);
    text-decoration: none;
    word-break: break-all;
}

.research-single__meta-value a:hover {
    text-decoration: underline;
}

/* Article prose content */
.research-single__content {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--color-text);
    margin-bottom: var(--space-8);
}

.research-single__content h2,
.research-single__content h3,
.research-single__content h4 {
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin: var(--space-6) 0 var(--space-3);
    line-height: var(--leading-tight);
}

.research-single__content h2 { font-size: var(--text-xl); }
.research-single__content h3 { font-size: var(--text-lg); }
.research-single__content h4 { font-size: var(--text-base); }

.research-single__content p {
    margin: 0 0 var(--space-4);
}

.research-single__content a {
    color: var(--color-primary);
    text-decoration: underline;
}

.research-single__content a:hover {
    color: var(--color-primary-light);
}

.research-single__content ul,
.research-single__content ol {
    padding-left: var(--space-6);
    margin-bottom: var(--space-4);
}

.research-single__content li {
    margin-bottom: var(--space-2);
}

.research-single__content blockquote {
    border-left: 4px solid var(--color-primary);
    margin: var(--space-5) 0;
    padding: var(--space-3) var(--space-5);
    background: rgba(26, 58, 92, 0.04);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    color: var(--color-text-muted);
}

/* Source link callout */
.research-single__source-callout {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--color-info-bg);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
}

.research-single__source-callout svg {
    flex-shrink: 0;
    color: var(--color-info);
}

.research-single__source-callout p {
    margin: 0;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-snug);
}

.research-single__source-callout a {
    color: var(--color-info);
    font-weight: var(--font-medium);
    text-decoration: none;
    word-break: break-all;
}

.research-single__source-callout a:hover {
    text-decoration: underline;
}

/* ══════════════════════════════════════════════════════════════
   RELATED ARTICLES
   ══════════════════════════════════════════════════════════════ */

.research-related {
    border-top: 2px solid var(--color-border);
    padding-top: var(--space-8);
    margin-top: var(--space-8);
}

.research-related__title {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin: 0 0 var(--space-5);
}

.research-related__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}

@media (min-width: 500px) {
    .research-related__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 800px) {
    .research-related__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.research-related-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.research-related-card:hover {
    box-shadow: var(--shadow);
    border-color: var(--color-border-strong);
}

.research-related-card__image {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-border);
}

.research-related-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-slow);
}

.research-related-card:hover .research-related-card__image img {
    transform: scale(1.04);
}

.research-related-card__image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
}

.research-related-card__body {
    padding: var(--space-3) var(--space-4);
}

.research-related-card__title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    line-height: var(--leading-snug);
    margin: 0 0 var(--space-1);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.research-related-card:hover .research-related-card__title {
    color: var(--color-primary);
}

.research-related-card__date {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH SECTION CONTAINERS (landing page)
   ══════════════════════════════════════════════════════════════ */

.research-section {
    margin-bottom: var(--space-10);
}

.research-section__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--color-border);
}

.research-section__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin: 0;
}

.research-section__title svg {
    flex-shrink: 0;
    color: var(--color-accent, #f59e0b);
}

.research-section__view-all {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
}

.research-section__view-all:hover {
    text-decoration: underline;
}

/* ══════════════════════════════════════════════════════════════
   FEATURED RESEARCH GRID
   ══════════════════════════════════════════════════════════════ */

.research-featured-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}

@media (min-width: 560px) {
    .research-featured-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .research-featured-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Featured card variation */
.research-card--featured {
    border-color: var(--color-accent, #f59e0b);
    border-width: 1.5px;
}

.research-card--featured:hover {
    border-color: var(--color-accent, #f59e0b);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.15);
}

.research-card__featured-flag {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 0.65rem;
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-accent, #f59e0b);
    margin-left: auto;
}

/* Status badge on cards */
.research-card__status-wrap {
    margin-bottom: var(--space-1);
}

/* ══════════════════════════════════════════════════════════════
   BROWSE TERM PILL CLOUD
   ══════════════════════════════════════════════════════════════ */

.research-browse-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.research-term-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    text-decoration: none;
    border: 1.5px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    transition: background var(--transition-fast), color var(--transition-fast),
                border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.research-term-pill:hover {
    box-shadow: var(--shadow);
}

/* Cancer type pills: primary blue */
.research-term-pill--cancer:hover {
    background: rgba(26, 58, 92, 0.06);
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}

/* Topic pills: teal/accent */
.research-term-pill--topic:hover {
    background: rgba(13, 148, 136, 0.06);
    border-color: #0d9488;
    color: #0d9488;
}

.research-term-pill__name {
    line-height: 1;
}

.research-term-pill__count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: var(--font-semibold);
    background: var(--color-bg);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH STATUS BADGE
   Semantic color per status type.
   ══════════════════════════════════════════════════════════════ */

.research-status-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-2);
    border-radius: var(--radius);
    font-size: 0.7rem;
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-decoration: none;
    white-space: nowrap;
    transition: opacity var(--transition-fast);
}

.research-status-badge:hover {
    opacity: 0.8;
}

/* Published Research — green */
.research-status-badge--published-research {
    background: rgba(16, 185, 129, 0.12);
    color: #047857;
}

/* Clinical Trial — blue */
.research-status-badge--clinical-trial {
    background: rgba(37, 99, 235, 0.1);
    color: #1d4ed8;
}

/* Recruiting Trial — orange */
.research-status-badge--recruiting-trial {
    background: rgba(245, 158, 11, 0.12);
    color: #b45309;
}

/* Meta Analysis — purple */
.research-status-badge--meta-analysis {
    background: rgba(124, 58, 237, 0.1);
    color: #6d28d9;
}

/* Guideline Update — teal */
.research-status-badge--guideline-update {
    background: rgba(13, 148, 136, 0.1);
    color: #0f766e;
}

/* Conference Abstract — gray */
.research-status-badge--conference-abstract {
    background: rgba(107, 114, 128, 0.1);
    color: #374151;
}

/* ══════════════════════════════════════════════════════════════
   SINGLE ARTICLE: TAXONOMY ROW + TOPIC PILLS
   ══════════════════════════════════════════════════════════════ */

.research-single__taxonomy-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.research-single__topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.research-single__topic-pill {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(13, 148, 136, 0.1);
    color: #0f766e;
    text-decoration: none;
    transition: background var(--transition-fast);
}

.research-single__topic-pill:hover {
    background: rgba(13, 148, 136, 0.18);
}

.research-single__statuses {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Journal citation value */
.research-single__meta-value--journal {
    font-style: italic;
}

/* ══════════════════════════════════════════════════════════════
   COMMUNITY DISCUSSION SECTION
   ══════════════════════════════════════════════════════════════ */

.research-discussion {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 2px solid var(--color-border);
}

.research-discussion__header {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.research-discussion__title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-text);
    margin: 0;
}

.research-discussion__stats {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.research-discussion__stat strong {
    color: var(--color-text);
    font-weight: var(--font-semibold);
}

.research-discussion__stat-divider {
    color: var(--color-border-strong);
}

/* ── Comment list ────────────────────────────────────────────── */

.research-discussion__list {
    list-style: none;
    margin: 0 0 var(--space-8);
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

/* Nested replies */
.research-discussion__list .children {
    list-style: none;
    margin: var(--space-4) 0 0 var(--space-10);
    padding: 0 0 0 var(--space-4);
    border-left: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.research-comment__body {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-4);
}

.research-comment__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.research-comment__avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
}

.research-comment__meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.research-comment__author {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.research-comment__time {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.research-comment__text {
    font-size: var(--text-sm);
    color: var(--color-text);
    line-height: var(--leading-relaxed);
}

.research-comment__text p:first-child { margin-top: 0; }
.research-comment__text p:last-child  { margin-bottom: 0; }

.research-comment__footer {
    margin-top: var(--space-3);
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border);
}

.research-comment__footer .comment-reply-link {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--color-primary-light);
    text-decoration: none;
}

.research-comment__footer .comment-reply-link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ── Empty state ─────────────────────────────────────────────── */

.research-discussion__empty {
    padding: var(--space-8) var(--space-4);
    text-align: center;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius);
    margin-bottom: var(--space-6);
}

/* ── Comment form ────────────────────────────────────────────── */

.research-discussion__respond {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.research-discussion__form-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-text);
    margin: 0 0 var(--space-4);
}

.research-discussion__form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.research-discussion__field {
    margin: 0;
}

.research-discussion__textarea {
    display: block;
    width: 100%;
    min-height: 120px;
    padding: var(--space-3) var(--space-4);
    border: 1.5px solid var(--color-border-strong);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text);
    background: var(--color-surface);
    resize: vertical;
    box-sizing: border-box;
    transition: border-color 0.15s;
}

.research-discussion__textarea:focus {
    outline: none;
    border-color: var(--color-primary-light);
}

.research-discussion__submit-row {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: 0;
}

.research-discussion__submit-btn {
    padding: var(--space-2) var(--space-5);
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: opacity 0.15s;
}

.research-discussion__submit-btn:hover {
    opacity: 0.9;
}

#cancel-comment-reply-link {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-decoration: underline;
}

#cancel-comment-reply-link:hover {
    color: var(--color-text);
}

/* ── Anonymous conversion gate ───────────────────────────────── */

.research-discussion-gate {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8) var(--space-6);
    text-align: center;
}

.research-discussion-gate__message {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
    max-width: 520px;
    margin: 0 auto var(--space-6);
}

.research-discussion-gate__actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH FOLLOW WIDGET
   ══════════════════════════════════════════════════════════════ */

/* ── Container ──────────────────────────────────────────────── */

.research-follow-widget {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Article single: sits between title and meta bar */
.research-single__follow {
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

/* Taxonomy archive: sits below page header description */
.research-tax__follow {
    margin-top: var(--space-4);
}

/* ── Button: base ───────────────────────────────────────────── */

.research-follow-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    border: 1.5px solid var(--color-primary);
    background: transparent;
    color: var(--color-primary);
    text-decoration: none;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
    -webkit-user-select: none;
    user-select: none;
}

.research-follow-btn:hover:not(:disabled) {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.research-follow-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ── Button: following state ────────────────────────────────── */

.research-follow-btn--following {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.research-follow-btn--following:hover:not(:disabled) {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* ── Button: loading state ──────────────────────────────────── */

.research-follow-btn--loading {
    opacity: 0.6;
    pointer-events: none;
    cursor: wait;
}

/* ── Button: error state ────────────────────────────────────── */

.research-follow-btn--error {
    border-color: var(--color-danger, #c53030);
    color: var(--color-danger, #c53030);
    animation: research-follow-shake 0.3s ease-in-out;
}

@keyframes research-follow-shake {
    0%, 100% { transform: translateX(0); }
    25%      { transform: translateX(-4px); }
    75%      { transform: translateX(4px); }
}

/* ── Follower count ─────────────────────────────────────────── */

.research-follow-count {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    white-space: nowrap;
}

/* ── Anonymous CTA (replaces button for logged-out visitors) ── */

.research-follow-cta {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5) var(--space-6);
    text-align: center;
}

.research-follow-cta__message {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
    max-width: 480px;
    margin: 0 auto var(--space-4);
}

.research-follow-cta__actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

@media (max-width: 480px) {
    .research-follow-btn {
        width: 100%;
        justify-content: center;
    }

    .research-follow-widget {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH SEARCH BOX (inline — archive pages)
   ══════════════════════════════════════════════════════════════ */

.research-search-box {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    max-width: 540px;
}

.research-search-box__input {
    flex: 1;
    min-width: 0;
    padding: var(--space-2) var(--space-4);
    border: 1.5px solid var(--color-border-strong);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color 0.15s;
    -webkit-appearance: none;
}

.research-search-box__input::placeholder {
    color: var(--color-text-subtle);
}

.research-search-box__input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.1);
}

.research-search-box__btn {
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    cursor: pointer;
    white-space: nowrap;
    transition: opacity 0.15s;
}

.research-search-box__btn:hover {
    opacity: 0.88;
}

.research-search-box__btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH SEARCH FORM (full — search page)
   ══════════════════════════════════════════════════════════════ */

.research-search-form {
    margin-bottom: var(--space-6);
}

/* ── Primary input row ──────────────────────────────────────── */

.research-search-form__primary {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.research-search-form__input-wrap {
    position: relative;
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
}

.research-search-form__icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-subtle);
    pointer-events: none;
    flex-shrink: 0;
}

.research-search-form__input {
    width: 100%;
    padding: var(--space-3) var(--space-10) var(--space-3) var(--space-9);
    border: 1.5px solid var(--color-border-strong);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text);
    background: var(--color-surface);
    box-sizing: border-box;
    transition: border-color 0.15s, box-shadow 0.15s;
    -webkit-appearance: none;
}

.research-search-form__input::placeholder {
    color: var(--color-text-subtle);
}

.research-search-form__input:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.1);
}

.research-search-form__clear {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border: none;
    background: var(--color-bg);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.research-search-form__clear:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.research-search-form__clear:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.research-search-form__submit {
    padding: var(--space-3) var(--space-6);
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    cursor: pointer;
    white-space: nowrap;
    transition: opacity 0.15s;
    flex-shrink: 0;
}

.research-search-form__submit:hover {
    opacity: 0.88;
}

.research-search-form__submit:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ── Filters row ────────────────────────────────────────────── */

.research-search-form__filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.research-search-filter {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    min-width: 140px;
    flex: 1;
}

.research-search-filter--sort {
    border-left: 1px solid var(--color-border);
    padding-left: var(--space-3);
}

.research-search-filter__label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-subtle);
}

.research-search-filter__select {
    padding: var(--space-2) var(--space-8) var(--space-2) var(--space-3);
    border: 1.5px solid var(--color-border-strong);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text);
    background: var(--color-surface);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23717789' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    transition: border-color 0.15s;
}

.research-search-filter__select:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.1);
}

/* ══════════════════════════════════════════════════════════════
   RESEARCH SEARCH SUMMARY (result count + applied filter chips)
   ══════════════════════════════════════════════════════════════ */

.research-search-summary {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.research-search-summary__count {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin: 0;
}

.research-search-summary__count strong {
    color: var(--color-text);
    font-weight: var(--font-semibold);
}

.research-search-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.research-search-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    text-decoration: none;
    background: rgba(26, 58, 92, 0.08);
    color: var(--color-primary);
    border: 1px solid rgba(26, 58, 92, 0.15);
    transition: background var(--transition-fast);
    white-space: nowrap;
}

.research-search-chip:hover {
    background: rgba(26, 58, 92, 0.16);
}

.research-search-chip:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.research-search-chip__label {
    color: var(--color-text-subtle);
    font-weight: var(--font-normal);
}

.research-search-chip__value {
    font-weight: var(--font-semibold);
}

.research-search-chip__remove {
    display: flex;
    align-items: center;
    margin-left: 2px;
    opacity: 0.6;
}

.research-search-chip:hover .research-search-chip__remove {
    opacity: 1;
}

.research-search-chip--clear {
    background: transparent;
    border-color: var(--color-border-strong);
    color: var(--color-text-muted);
}

.research-search-chip--clear:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

/* ══════════════════════════════════════════════════════════════
   SEARCH RESULT CARD EXTENSIONS
   Extends .research-card with follow + discussion stat row.
   ══════════════════════════════════════════════════════════════ */

.research-card__meta--search {
    gap: var(--space-3);
}

.research-card__stat {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
}

.research-card__stat svg {
    flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════════════
   SEARCH EMPTY STATE
   ══════════════════════════════════════════════════════════════ */

.research-empty--search .research-empty__suggestions {
    margin-top: var(--space-4);
    text-align: left;
    max-width: 380px;
    margin-left: auto;
    margin-right: auto;
}

.research-empty--search .research-empty__suggestions p {
    font-weight: var(--font-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.research-empty--search .research-empty__suggestions ul {
    list-style: disc;
    padding-left: var(--space-5);
    margin: 0;
}

.research-empty--search .research-empty__suggestions li {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
}

.research-empty--search .research-empty__suggestions a {
    color: var(--color-primary);
    text-decoration: underline;
}

.research-empty--search .research-empty__suggestions a:hover {
    color: var(--color-primary-light);
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE: search form
   ══════════════════════════════════════════════════════════════ */

@media (max-width: 600px) {
    .research-search-form__primary {
        flex-direction: column;
    }

    .research-search-form__submit {
        width: 100%;
        justify-content: center;
    }

    .research-search-form__filters {
        flex-direction: column;
    }

    .research-search-filter--sort {
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--color-border);
        padding-top: var(--space-3);
    }

    .research-search-filter {
        min-width: 0;
    }

    .research-search-box {
        flex-direction: column;
        max-width: 100%;
    }

    .research-search-box__btn {
        width: 100%;
    }
}