/* ==========================================================================
   Inner Pages — Case Studies, Blog Posts, Blog Index
   Matches the "Ink & Signal" theme from style.css
   ========================================================================== */

/* Page Header */
.page-header {
    padding: 8.5rem 0 3.5rem;
    background: var(--paper);
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--copper);
    text-decoration: none;
    margin-bottom: 2rem;
    letter-spacing: 0.3px;
    transition: all var(--duration) var(--ease-out);
}

.back-link:hover {
    color: var(--copper-light);
    transform: translateX(-3px);
}

.case-meta {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 1.25rem;
}

.case-tag {
    display: inline-block;
    padding: 0.3rem 0.7rem;
    background: var(--copper-faint);
    color: var(--copper);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.page-header h1 {
    font-size: clamp(1.8rem, 3.5vw, 2.75rem);
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
    max-width: 780px;
    line-height: 1.15;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--slate);
    line-height: 1.6;
    max-width: 680px;
    margin-bottom: 2rem;
}

/* Quick Facts Bar */
.case-quick-facts {
    display: flex;
    gap: 2.5rem;
    padding-top: 1.75rem;
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.quick-fact {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.quick-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--steel);
}

.quick-value {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
}

/* Page Content */
.page-content {
    padding: 3.5rem 0 5rem;
}

.content-container {
    max-width: 720px;
}

.content-section {
    margin-bottom: 3.5rem;
}

.content-section h2 {
    font-size: 1.7rem;
    margin-bottom: 1.25rem;
    padding-top: 0.5rem;
}

.content-section h3 {
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 1.05rem;
    margin-top: 2rem;
    margin-bottom: 0.85rem;
    color: var(--ink);
    letter-spacing: 0;
}

.content-section p {
    font-size: 1.125rem;
    line-height: 1.75;
    margin-bottom: 1.25rem;
    color: var(--slate);
}

.content-section a {
    color: var(--copper);
    text-decoration: underline;
    text-decoration-color: rgba(37, 99, 235, 0.3);
    text-underline-offset: 3px;
    transition: all var(--duration) var(--ease-out);
}

.content-section a:hover {
    text-decoration-color: var(--copper);
}

.content-section ul,
.content-section ol {
    margin-bottom: 1.25rem;
    padding-left: 1.25rem;
}

.content-section li {
    font-size: 1.125rem;
    line-height: 1.75;
    margin-bottom: 0.6rem;
    color: var(--slate);
}

.content-section li strong {
    color: var(--ink);
}

.content-section em {
    font-style: italic;
}

.content-section code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--fog);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    border: 1px solid var(--color-border-light);
    color: var(--copper);
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.85rem;
    margin: 1.75rem 0;
}

.result-card {
    background: var(--copper-faint);
    border: 1px solid rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-md);
    padding: 1.5rem 1rem;
    text-align: center;
}

.result-number {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 400;
    color: var(--copper);
    margin-bottom: 0.3rem;
}

.result-label {
    font-size: 0.88rem;
    color: var(--slate);
    line-height: 1.4;
}

/* ==========================================================================
   In-Article SVG Diagrams
   ========================================================================== */
.article-diagram {
    margin: 2.5rem 0;
    padding: 2rem 1.5rem;
    background: var(--fog);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    overflow-x: auto;
}

.article-diagram svg {
    width: 100%;
    max-width: 640px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.article-diagram-caption {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--steel);
    margin-top: 1rem;
    letter-spacing: 0.3px;
}

.article-diagram-wide svg {
    max-width: 720px;
}

@media (max-width: 768px) {
    .article-diagram {
        padding: 1.25rem 0.75rem;
        margin: 1.75rem -0.5rem;
        border-radius: var(--radius-md);
    }
}

/* Tech Stack Grid */
.tech-stack-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
    margin-top: 1.25rem;
}

.tech-item {
    font-size: 1rem;
    color: var(--slate);
    padding: 0.75rem 1rem;
    background: var(--fog);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-light);
    border-left: 2px solid var(--copper);
}

.tech-item strong {
    color: var(--ink);
}

/* Content CTA */
.content-cta {
    margin-top: 4rem;
    padding: 3rem;
    background: var(--ink);
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.content-cta h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    color: var(--paper);
    position: relative;
}

.content-cta p {
    font-size: 1.0625rem;
    color: var(--silver);
    margin-bottom: 1.75rem;
    position: relative;
}

.content-cta .btn-primary {
    background: var(--copper);
    color: var(--paper);
    position: relative;
}

.content-cta .btn-primary:hover {
    background: var(--copper-light);
}

.content-cta .btn-secondary {
    color: var(--paper);
    border-color: rgba(255,255,255,0.2);
    position: relative;
}

.content-cta .btn-secondary:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.3);
}

/* ==========================================================================
   Blog Index Page
   ========================================================================== */

/* Category headings */
.blog-category {
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--color-border);
}

.blog-category:first-of-type {
    margin-top: 2.5rem;
}

.blog-category-title {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 0.35rem;
}

.blog-category-desc {
    font-size: 1.0625rem;
    color: var(--steel);
    line-height: 1.6;
}

/* Card grid within categories */
.blog-index-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

/* Legacy single-column grid (kept for compat) */
.blog-index-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    max-width: 720px;
}

.blog-index-card {
    display: block;
    text-decoration: none;
    background: var(--paper);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.75rem 2rem;
    transition: all var(--duration) var(--ease-out);
    position: relative;
}

.blog-index-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--copper);
    border-radius: 2px 0 0 2px;
    opacity: 0;
    transition: opacity var(--duration) var(--ease-out);
}

.blog-index-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(3px);
}

.blog-index-card:hover::before {
    opacity: 1;
}

.blog-index-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.blog-index-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--copper);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.blog-index-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--steel);
    letter-spacing: 0.3px;
}

.blog-index-card h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.3rem;
    color: var(--ink);
    margin-bottom: 0.6rem;
    letter-spacing: -0.01em;
    transition: color var(--duration) var(--ease-out);
}

a.blog-index-card:hover h3 {
    color: var(--copper);
}

.blog-index-card p {
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--slate);
    margin-bottom: 0.6rem;
}

.blog-index-status {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--silver);
    letter-spacing: 0.5px;
}

/* Blog Subscribe Box */
.blog-subscribe {
    margin-top: 3rem;
    padding: 3rem;
    background: var(--paper);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 720px;
}

.blog-subscribe h3 {
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 1.15rem;
    margin-bottom: 0.35rem;
    letter-spacing: 0;
}

.blog-subscribe p {
    font-size: 0.9rem;
    color: var(--slate);
    margin-bottom: 1.5rem;
}

/* ==========================================================================
   Responsive — Inner Pages
   ========================================================================== */
@media (max-width: 768px) {
    .page-header {
        padding: 7rem 0 2.5rem;
    }

    .page-header h1 {
        font-size: 1.65rem;
    }

    .case-quick-facts {
        gap: 1.25rem;
    }

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

    .tech-stack-grid {
        grid-template-columns: 1fr;
    }

    .content-cta {
        padding: 2rem 1.5rem;
    }
}