/* ==========================================
   CASE STUDIES PAGE STYLES
   Extends design tokens from style.css
   ========================================== */

/* ---- CS Hero ---- */
.cs-hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    padding: calc(var(--spacing-xl) + 80px) var(--spacing-md) var(--spacing-xl);
}

.cs-hero-inner {
    max-width: 800px;
}

.cs-hero .hero-subtitle {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-dark);
    text-transform: uppercase;
    letter-spacing: 0.3em;
    margin-bottom: var(--spacing-sm);
}

.cs-hero h1 {
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.cs-hero h1 .highlight {
    color: var(--color-accent);
    font-style: italic;
}

.cs-hero .hero-sub {
    font-size: 1.15rem;
    color: var(--color-text-dark);
    max-width: 650px;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.cs-hero .hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ---- Intro Positioning ---- */
.cs-intro {
    padding: var(--spacing-xl) 0;
}

.cs-intro p {
    font-size: 1.15rem;
    color: var(--color-text-dark);
    max-width: 750px;
    line-height: 1.8;
}

/* ---- Value Cards (What I Bring) ---- */
.cs-values {
    padding: var(--spacing-xl) 0;
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.value-card {
    padding: var(--spacing-lg);
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    transition: all var(--transition-normal);
}

.value-card:hover {
    border-color: var(--color-accent);
    background: rgba(0, 255, 136, 0.03);
    transform: translateY(-4px);
}

.value-card h3 {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.value-card p {
    font-size: 0.95rem;
    color: var(--color-text-dark);
    line-height: 1.7;
}

/* ---- Category Filter ---- */
.cs-featured {
    padding: var(--spacing-xl) 0;
}

.filter-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.6rem 1.4rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--color-text-dark);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: lowercase;
    border-radius: 2px;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-black);
}

/* ---- Case Study Cards ---- */
.cs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.cs-card {
    background: rgba(10, 10, 10, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.cs-card.hidden {
    display: none;
}

.cs-card:hover {
    border-color: rgba(0, 255, 136, 0.3);
}

.cs-card-header {
    padding: var(--spacing-lg);
    cursor: pointer;
    position: relative;
}

.cs-card-category {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-xs);
}

.cs-card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.cs-card-overview {
    font-size: 0.95rem;
    color: var(--color-text-dark);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.cs-card-toggle {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
}

.cs-card-toggle .arrow {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.cs-card.expanded .cs-card-toggle .arrow {
    transform: rotate(90deg);
}

.cs-card-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.cs-card.expanded .cs-card-details {
    max-height: 1200px;
}

.cs-card-details-inner {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: var(--spacing-md);
}

.cs-detail-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.cs-detail-block h4 {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.cs-detail-block p {
    font-size: 0.9rem;
    color: var(--color-text-dark);
    line-height: 1.7;
}

.cs-card-footer {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.cs-card-footer .cs-role {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-dark);
    flex: 1 1 100%;
    margin-bottom: var(--spacing-xs);
}

.cs-card-footer .cs-role strong {
    color: var(--color-text);
}

.cs-card-footer .cs-tools {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-text-dark);
    flex: 1 1 100%;
    margin-bottom: var(--spacing-sm);
}

.cs-card-footer .cs-tools strong {
    color: var(--color-text);
}

.cs-card-link {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    text-decoration: none;
    border: 1px solid var(--color-accent);
    padding: 0.4rem 1rem;
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.cs-card-link:hover {
    background: var(--color-accent);
    color: var(--color-black);
}

/* ---- AI in Practice ---- */
.cs-ai-practice {
    padding: var(--spacing-xl) 0;
    background: rgba(255, 255, 255, 0.015);
}

.ai-steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.ai-step {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
}

.ai-step-number {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: rgba(0, 255, 136, 0.15);
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.ai-step h4 {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.ai-step p {
    font-size: 0.85rem;
    color: var(--color-text-dark);
    line-height: 1.6;
}

.ai-practice-copy {
    max-width: 700px;
    font-size: 1rem;
    color: var(--color-text-dark);
    line-height: 1.8;
}

/* ---- Brand Range ---- */
.cs-brands {
    padding: var(--spacing-xl) 0;
}

.cs-brand-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-sm);
}

.cs-brand-item {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-dark);
    text-align: center;
    padding: var(--spacing-md) var(--spacing-sm);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.cs-brand-item:hover {
    border-color: rgba(0, 255, 136, 0.2);
    color: var(--color-text);
}

/* ---- About ---- */
.cs-about {
    padding: var(--spacing-xl) 0;
}

.cs-about-text {
    max-width: 700px;
}

.cs-about-text .lead {
    font-size: 1.5rem;
    color: var(--color-white);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.cs-about-text p {
    font-size: 1.05rem;
    color: var(--color-text-dark);
    line-height: 1.8;
}

/* ---- Final CTA ---- */
.cs-final-cta {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.cs-final-cta h2 {
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.2;
}

.cs-final-cta .hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ---- Anchor Nav ---- */
.cs-anchor-nav {
    position: sticky;
    top: 70px;
    z-index: 100;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: var(--spacing-sm) 0;
}

.cs-anchor-nav .container {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
}

.cs-anchor-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-dark);
    text-decoration: none;
    white-space: nowrap;
    padding: 0.3rem 0;
    transition: color var(--transition-fast);
}

.cs-anchor-link:hover {
    color: var(--color-accent);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .value-grid {
        grid-template-columns: 1fr;
    }

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

    .ai-steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cs-detail-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .cs-hero {
        min-height: auto;
        padding-top: calc(var(--spacing-xl) + 60px);
    }

    .ai-steps-grid {
        grid-template-columns: 1fr;
    }

    .cs-anchor-nav .container {
        gap: var(--spacing-sm);
    }
}