/* Case Study — bridges old variable names to the new design tokens */
:root {
    /* colour aliases */
    --bg-primary:   var(--bg);
    --bg-secondary: var(--surface);
    --bg-elevated:  #ffffff;
    --bg-hover:     var(--surface);
    --border-subtle:  var(--border);
    --border-default: var(--border);
    --text-primary:   var(--text);
    --text-secondary: var(--muted);
    --text-muted:     var(--subtle);

    /* spacing */
    --space-1: 4px;  --space-2: 8px;   --space-3: 12px;
    --space-4: 16px; --space-5: 20px;  --space-6: 24px;
    --space-8: 32px; --space-10: 40px; --space-12: 48px;
    --space-16: 64px; --space-20: 80px;

    /* radius */
    --radius-sm: 6px; --radius-md: 8px;  --radius-lg: 12px;
    --radius-xl: 16px; --radius-2xl: 24px;

    /* shadows */
    --shadow-sm:   0 1px 2px rgba(0,0,0,0.05);
    --shadow-md:   0 4px 6px rgba(0,0,0,0.08);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06);

    /* transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* Case Study Page Styles */

/* =========================
   Case Study Page
   ========================= */
.case-study-page {
    /* no extra top padding — nav is fixed */
}

.case-hero {
    padding: 120px 0 64px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-subtle);
}

/* Centred container — matches the wider main site layout */
.case-hero .container,
.case-section .container,
.case-section .container-sm,
.case-section .container-lg,
.section-nav .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 72px;
    box-sizing: border-box;
    width: 100%;
}

@media (max-width: 768px) {
    .case-hero .container,
    .case-section .container,
    .case-section .container-sm,
    .case-section .container-lg,
    .section-nav .container,
    .case-nav-inner { padding: 0 24px; }
}

.case-hero-content {
    margin-bottom: var(--space-12);
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.case-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.case-summary {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 800px;
    margin-bottom: var(--space-10);
}

.case-meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-6);
    padding: var(--space-6);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.case-meta-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.case-meta-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.case-meta-value {
    font-size: 0.9375rem;
    color: var(--text-primary);
    font-weight: 500;
}

.case-hero-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-card);
}

.case-image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    color: var(--text-muted);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .case-hero {
        padding: var(--space-12) 0 var(--space-10);
    }
    
    .case-title {
        font-size: 2.25rem;
    }
    
    .case-summary {
        font-size: 1.0625rem;
    }
    
    .case-meta-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================
   Case Study Content Sections
   ========================= */
.case-content {
    background: var(--bg-primary);
}

.case-section {
    padding: var(--space-20) 0;
    border-bottom: 1px solid var(--border-subtle);
}

.case-section:last-of-type {
    border-bottom: none;
}

.section-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.content-block {
    margin-bottom: var(--space-12);
}

.content-block:last-child {
    margin-bottom: 0;
}

.content-block h3 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.content-block p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-4);
    max-width: 800px;
}

.content-block p:last-child {
    margin-bottom: 0;
}

/* =========================
   Research Stats
   ========================= */
.research-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-5);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    text-align: center;
    border-radius: 16px !important;
    overflow: hidden;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.testing-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-6);
    border-radius: 16px;
    margin-top: var(--space-8);
}

/* =========================
   Pain Points Grid
   ========================= */
.pain-points-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.pain-point-card {
    padding: var(--space-6);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.pain-point-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.pain-point-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.pain-point-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.pain-point-card blockquote {
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-left: 3px solid var(--text-primary);
    border-radius: var(--radius-sm);
    font-style: italic;
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.6;
}

/* =========================
   Problem Statement
   ========================= */
.problem-statement {
    padding: var(--space-8);
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    border: 2px solid var(--text-primary);
    margin: var(--space-6) 0;
}

.problem-statement p {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin: 0;
    max-width: none;
}

.problem-statement strong {
    font-weight: 700;
}

/* =========================
   Insights Grid
   ========================= */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-8);
}

@media (max-width: 900px) {
    .pain-points-grid { grid-template-columns: 1fr; }
    .insights-grid    { grid-template-columns: repeat(2, 1fr); }
}

.insight-card {
    padding: var(--space-6);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.insight-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 50%;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: var(--space-4);
}

.insight-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.insight-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* =========================
   Decisions Grid
   ========================= */
.decisions-grid {
    display: grid;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.decision-card {
    padding: var(--space-6);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.decision-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.decision-card p {
    margin-bottom: var(--space-3);
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.decision-card p:last-child {
    margin-bottom: 0;
}

/* =========================
   Image Blocks
   ========================= */
.image-block {
    margin: var(--space-10) 0;
}

.image-block img {
    width: 100%;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-card);
}

.image-caption {
    margin-top: var(--space-3);
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: center;
    font-style: italic;
}

/* =========================
   Findings Grid
   ========================= */
.findings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.finding-card {
    padding: var(--space-6);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.finding-status {
    display: inline-block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
}

.finding-status.success {
    background: #dcfce7;
    color: #166534;
}

.finding-status.warning {
    background: #fed7aa;
    color: #9a3412;
}

.finding-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .findings-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================
   Outcomes Grid
   ========================= */
.outcomes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.outcome-card {
    padding: var(--space-6);
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    text-align: center;
}

.outcome-metric {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    line-height: 1;
}

.outcome-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin: 0;
    line-height: 1.5;
}

/* =========================
   Testimonials
   ========================= */
.testimonials {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.testimonial {
    padding: var(--space-6);
    background: var(--bg-elevated);
    border-left: 4px solid var(--text-primary);
    border-radius: var(--radius-lg);
    font-size: 1.0625rem;
    font-style: italic;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.7;
}

.testimonial cite {
    display: block;
    margin-top: var(--space-4);
    font-size: 0.875rem;
    font-style: normal;
    color: var(--text-muted);
}

/* =========================
   Takeaways List
   ========================= */
.takeaways-list {
    list-style: none;
    margin-top: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.takeaways-list li {
    padding-left: var(--space-8);
    position: relative;
    font-size: 1.0625rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.takeaways-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.case-navigation {
    padding: 64px 0;
    border-top: 1px solid var(--border-subtle);
}

.case-nav-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 48px;
}

.case-nav-link {
    display: inline-flex;
    flex-direction: column;
    gap: 6px;
    text-decoration: none;
    padding: 20px 24px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    transition: var(--transition-base);
    max-width: 280px;
}

.case-nav-link:hover {
    border-color: var(--border-default);
    transform: translateX(-6px);
    box-shadow: var(--shadow-md);
}

.case-nav-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.case-nav-title {
    font-size: 1.125rem;
    color: var(--text-primary);
    font-weight: 600;
}

@media (max-width: 768px) {
    .case-navigation {
        padding: var(--space-10) 0;
    }
}

/* =========================
   Section Jump Navigation (Bubbles)
   ========================= */
.section-nav {
    padding: var(--space-12) 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    position: relative;
    
    
    backdrop-filter: blur(8px);
}

.process-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.process-bubble {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
    min-width: 100px;
}

.process-bubble:hover {
    background: var(--bg-hover);
}

.bubble-number {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 2px solid var(--border-default);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
    transition: var(--transition-base);
}

.process-bubble:hover .bubble-number {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
    transform: scale(1.1);
}

.bubble-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
}

.process-bubble:hover .bubble-label {
    color: var(--text-primary);
}

/* Active state when scrolled to section */
.process-bubble.active .bubble-number {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.process-bubble.active .bubble-label {
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .section-nav {
        top: 64px;
        padding: var(--space-6) 0;
    }
    
    .process-nav {
        gap: var(--space-2);
    }
    
    .process-bubble {
        padding: var(--space-2);
        min-width: auto;
    }
    
    .bubble-number {
        width: 44px;
        height: 44px;
        font-size: 0.75rem;
    }
    
    .bubble-label {
        font-size: 0.6875rem;
    }
}