/* ==========================================================================
   Case study layout - project detail pages
   Loaded after modern.css so these rules win on equal specificity.
   ========================================================================== */

.cs-shell {
    max-width: 960px;
    margin: 0 auto;
}

/* ---------- hero ---------- */
.cs-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-lg);
    transition: gap .18s ease;
}
.cs-back:hover { gap: 12px; }

.cs-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--color-secondary);
    background: color-mix(in oklab, var(--color-secondary) 10%, transparent);
    border: 1px solid color-mix(in oklab, var(--color-secondary) 24%, transparent);
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: var(--spacing-md);
}

.cs-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -.02em;
    color: var(--color-on-surface);
    margin: 0 0 var(--spacing-md);
}

.cs-lede {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-on-surface-variant);
    margin: 0 0 var(--spacing-lg);
    max-width: 68ch;
}

.cs-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: var(--spacing-xl);
}
.cs-tag {
    font-size: 12.5px;
    font-weight: 500;
    color: var(--color-on-surface-variant);
    background: var(--color-surface-container);
    border: 1px solid var(--color-outline-variant);
    padding: 5px 12px;
    border-radius: 999px;
}

/* ---------- meta strip ---------- */
.cs-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1px;
    background: var(--color-outline-variant);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}
.cs-meta-item {
    background: var(--color-surface-container);
    padding: var(--spacing-md) var(--spacing-lg);
}
.cs-meta-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--color-on-surface-variant);
    margin: 0 0 6px;
}
.cs-meta-value {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-on-surface);
    margin: 0;
}

/* ---------- screenshot ---------- */
.cs-figure {
    margin: 0 0 var(--spacing-2xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-surface-container);
    border: 1px solid var(--color-outline-variant);
    box-shadow: 0 18px 44px -24px rgba(0, 0, 0, .45);
}
.cs-figure img {
    display: block;
    width: 100%;
    height: auto;
}
.cs-figure figcaption {
    padding: 14px var(--spacing-lg);
    font-size: 13.5px;
    color: var(--color-on-surface-variant);
    border-top: 1px solid var(--color-outline-variant);
}

/* ---------- narrative sections ---------- */
.cs-block {
    position: relative;
    padding: var(--spacing-xl) 0 var(--spacing-xl) 28px;
    border-left: 2px solid var(--color-outline-variant);
}
.cs-block + .cs-block { margin-top: var(--spacing-sm); }
.cs-block::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 30px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-secondary);
}
.cs-block-title {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--color-secondary);
    margin: 0 0 10px;
}
.cs-block p {
    font-size: 16.5px;
    line-height: 1.78;
    color: var(--color-on-surface);
    margin: 0 0 14px;
    max-width: 70ch;
}
.cs-block p:last-child { margin-bottom: 0; }

.cs-block--outcome {
    background: color-mix(in oklab, var(--color-secondary) 6%, transparent);
    border-left-color: var(--color-secondary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding-right: var(--spacing-lg);
}

/* ---------- section heading ---------- */
.cs-section {
    margin-bottom: var(--spacing-xl);
}
.cs-section-head {
    display: flex;
    align-items: baseline;
    gap: 14px;
    margin-bottom: var(--spacing-lg);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-outline-variant);
}
.cs-section-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -.01em;
    color: var(--color-on-surface);
    margin: 0;
}
.cs-section-count {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-on-surface-variant);
}

/* ---------- feature grid ---------- */
.cs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}
.cs-card {
    background: var(--color-surface-container);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: border-color .18s ease, transform .18s ease;
}
.cs-card:hover {
    border-color: color-mix(in oklab, var(--color-secondary) 45%, var(--color-outline-variant));
    transform: translateY(-2px);
}
.cs-card-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: color-mix(in oklab, var(--color-secondary) 14%, transparent);
    color: var(--color-secondary);
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 12px;
}
.cs-card-title {
    font-family: var(--font-heading);
    font-size: 16.5px;
    font-weight: 700;
    line-height: 1.35;
    color: var(--color-on-surface);
    margin: 0 0 8px;
}
.cs-card-desc {
    font-size: 14.5px;
    line-height: 1.68;
    color: var(--color-on-surface-variant);
    margin: 0;
}

/* ---------- tech stack ---------- */
.cs-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--color-on-surface);
    background: var(--color-surface-container);
    border: 1px solid var(--color-outline-variant);
    padding: 8px 15px;
    border-radius: 999px;
}
.chip::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-secondary);
}

/* ---------- long-form prose ---------- */
.cs-prose p {
    font-size: 16.5px;
    line-height: 1.8;
    color: var(--color-on-surface);
    margin: 0 0 18px;
    max-width: 70ch;
}
.cs-prose p:last-child { margin-bottom: 0; }

/* ---------- prev / next ---------- */
.cs-pager {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-2xl) 0 var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-outline-variant);
}
.cs-pager-link {
    display: block;
    padding: var(--spacing-lg);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-md);
    text-decoration: none;
    background: var(--color-surface-container);
    transition: border-color .18s ease, background .18s ease;
}
.cs-pager-link:hover {
    border-color: var(--color-secondary);
    background: color-mix(in oklab, var(--color-secondary) 6%, var(--color-surface-container));
}
.cs-pager-link--next { text-align: right; }
.cs-pager-label {
    display: block;
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--color-on-surface-variant);
    margin-bottom: 6px;
}
.cs-pager-title {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.35;
    color: var(--color-on-surface);
    margin: 0;
}

/* ---------- CTA ---------- */
.cs-cta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    background: var(--color-primary);
    color: var(--color-on-primary);
    margin-bottom: var(--spacing-2xl);
}
.cs-cta h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0 0 6px;
}
.cs-cta p {
    font-size: 15px;
    line-height: 1.6;
    margin: 0;
    opacity: .92;
    max-width: 52ch;
}
.cs-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--color-on-primary);
    color: var(--color-primary);
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    transition: transform .18s ease, opacity .18s ease;
}
.cs-cta-btn:hover { transform: translateY(-2px); opacity: .92; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
    .cs-block { padding-left: 22px; padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
    .cs-block::before { top: 22px; width: 8px; height: 8px; left: -5px; }
    .cs-block p, .cs-prose p { font-size: 16px; }
    .cs-pager-link--next { text-align: left; }
    .cs-cta { flex-direction: column; align-items: flex-start; }
    .cs-meta { grid-template-columns: repeat(2, 1fr); }
}