/* Case study layout */
.cs-hero {
    padding: 48px 0 40px;
}

.cs-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 28px;
    transition: color 0.2s;
}

.cs-back:hover {
    color: var(--brand-green);
}

.cs-eyebrow {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--brand-green);
    font-weight: 600;
    margin-bottom: 12px;
}

.cs-hero h1 {
    font-size: 2.2rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
    margin-bottom: 14px;
}

.cs-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 32px;
    padding: 18px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.cs-meta-item {
    font-size: 0.83rem;
}

.cs-meta-label {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.72rem;
    margin-bottom: 2px;
}

.cs-meta-val {
    color: var(--text-main);
    font-weight: 600;
}

.cs-overview {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 0;
}

.cs-section {
    padding: 52px 0;
    border-top: 1px solid var(--border-color);
}

.cs-section-num {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 4px;
}

.cs-section-title {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 24px;
}

.breadcrumb {
    padding: 8px 0;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.breadcrumb-list {
    list-style: none;
    display: flex;
    gap: 8px;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--brand-green);
    text-decoration: none;
}

/* Impact stats */
.impact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.impact-cell {
    background: #fff;
    padding: 22px 18px;
    transition: background 0.2s;
}

.impact-cell:hover {
    background: #fafafa;
}

.impact-cell-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.impact-cell-val {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1;
    margin-bottom: 6px;
}

.impact-cell-change {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--brand-green);
}

/* Charts */
.charts-row,
.audience-row,
.platform-row,
.platform-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.chart-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 22px;
}

.chart-card-title {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 4px;
}

.chart-card-sub {
    font-size: 0.76rem;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.legend-row {
    display: flex;
    gap: 14px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.76rem;
    color: var(--text-muted);
}

.legend-swatch {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

.chart-frame-sm,
.chart-frame-md,
.chart-frame-lg {
    position: relative;
}

.chart-frame-sm {
    height: 180px;
}

.chart-frame-md {
    height: 190px;
}

.chart-frame-lg {
    height: 200px;
}

/* Platform cards */
.plat-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 16px;
}

.plat-card.flush {
    margin-bottom: 0;
}

.platform-row .plat-card {
    margin-bottom: 0;
}

.plat-card.spaced {
    margin-bottom: 24px;
}

.plat-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.plat-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.plat-icon.li {
    background: #E6F0FB;
    color: #0a66c2;
}

.plat-icon.ig {
    background: #FBEAF0;
    color: #993556;
}

.plat-icon.fb {
    background: #E6F1FB;
    color: #185FA5;
}

.plat-icon.meta {
    background: #E6F1FB;
    color: #0866ff;
}

.plat-icon.seo {
    background: rgba(47, 106, 62, 0.08);
    color: var(--brand-green);
}

.plat-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.plat-handle,
.plat-note,
.metric-note {
    font-size: 0.74rem;
    color: var(--text-muted);
}

.plat-badge {
    margin-left: auto;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--brand-green);
    background: rgba(47, 106, 62, 0.08);
    padding: 3px 10px;
    border-radius: 20px;
}

.plat-metrics {
    padding: 4px 20px 14px;
}

.plat-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.84rem;
}

.plat-row:last-child {
    border-bottom: none;
}

.plat-row-label {
    color: var(--text-muted);
}

.plat-row-val {
    font-weight: 600;
    color: var(--text-main);
}

.plat-row-val.muted {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.badge {
    font-size: 0.68rem;
    padding: 2px 6px;
    border-radius: 20px;
    margin-left: 5px;
    font-weight: 600;
}

.badge.up {
    background: rgba(47, 106, 62, 0.1);
    color: var(--brand-green);
}

.badge.neutral {
    background: #f0f0f0;
    color: var(--text-muted);
}

.badge.new {
    background: #EEEDFE;
    color: #534AB7;
}

/* Audience and intent bars */
.aud-bar-row,
.intent-row {
    display: flex;
    align-items: center;
}

.aud-bar-row {
    gap: 10px;
    margin-bottom: 10px;
}

.intent-row {
    gap: 12px;
    margin-bottom: 12px;
}

.aud-label,
.intent-label {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.aud-label {
    min-width: 44px;
}

.intent-label {
    min-width: 110px;
}

.aud-track,
.intent-track {
    flex: 1;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.aud-fill,
.intent-fill {
    height: 100%;
    border-radius: 3px;
}

.aud-pct,
.intent-pct {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-main);
    text-align: right;
}

.aud-pct {
    min-width: 30px;
}

.intent-pct {
    min-width: 40px;
    font-weight: 700;
}

.intent-list {
    margin-top: 16px;
}

/* A/B test */
.ab-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-top: 16px;
}

.ab-card {
    background: #fff;
    padding: 22px;
}

.ab-card.winner {
    background: rgba(47, 106, 62, 0.04);
}

.ab-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    margin-bottom: 14px;
}

.ab-label.win {
    color: var(--brand-green);
}

.ab-label.lose {
    color: var(--text-muted);
}

.ab-metric {
    margin-bottom: 10px;
}

.ab-metric-sub {
    font-size: 0.76rem;
    color: var(--text-muted);
    margin-bottom: 3px;
}

.ab-metric-val {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1;
}

.ab-metric-val.win {
    color: var(--brand-green);
}

.ab-metric-val.muted {
    color: var(--text-muted);
}

/* Top posts */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.post-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.post-thumb {
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.post-thumb.t1 {
    background: #FBEAF0;
}

.post-thumb.t2 {
    background: rgba(47, 106, 62, 0.08);
}

.post-thumb.t3 {
    background: #FAEEDA;
}

.post-body {
    padding: 14px;
}

.post-caption {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-likes {
    font-size: 0.8rem;
    font-weight: 600;
    color: #993556;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Keyword chips */
.keyword-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.kw-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 4px 12px;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}

a.kw-chip:hover {
    border-color: var(--brand-green);
    color: var(--brand-green);
}

.kw-rank {
    font-size: 0.68rem;
    font-weight: 700;
    background: var(--brand-green);
    color: #fff;
    padding: 1px 5px;
    border-radius: 10px;
}

/* Tags and back link */
.cs-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

.cs-tags.hero-tags {
    margin-top: 20px;
}

.cs-tag {
    font-size: 0.76rem;
    color: var(--brand-green);
    background: rgba(47, 106, 62, 0.07);
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 500;
}

.cs-back-bottom {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    color: var(--brand-green);
    text-decoration: none;
    font-weight: 600;
    padding: 52px 0 0;
    border-top: 1px solid var(--border-color);
    width: 100%;
}

.cs-back-bottom:hover {
    text-decoration: underline;
}

.section-kicker {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 28px;
    margin-bottom: 4px;
}

.section-kicker.spacious {
    margin-top: 32px;
    margin-bottom: 12px;
}

.small-muted {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.small-muted.spaced {
    margin-top: 14px;
}

.chart-gap {
    margin-bottom: 24px;
}

.stack-gap {
    margin-top: 12px;
}

/* Fade-in */
.fade-in {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 600px) {
    .cs-hero h1 {
        font-size: 1.65rem;
    }

    .impact-grid {
        grid-template-columns: 1fr 1fr;
    }

    .charts-row,
    .audience-row,
    .platform-row,
    .platform-pair,
    .ab-row {
        grid-template-columns: 1fr;
    }

    .posts-grid {
        grid-template-columns: 1fr 1fr;
    }

    .cs-meta-row {
        gap: 14px;
    }
}