/* ============================================
   Case Study Page Styles
   Professional B2B Corporate Style
   ============================================ */

/* Case Study Hero */
.case-hero {
    background: var(--gradient-hero);
    padding: 4rem 0 5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.case-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.case-hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.case-client-logo {
    width: 120px;
    height: 120px;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-lg);
}

.case-client-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.case-industry-tag {
    display: inline-block;
    background: rgba(6, 182, 212, 0.2);
    color: var(--accent-cyan);
    padding: 0.375rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.case-hero h1 {
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.case-summary {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.case-key-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.case-key-stats > div {
    text-align: center;
}

.case-stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-cyan);
    line-height: 1;
}

.case-stat-label {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 0.5rem;
}

/* Case Content Section */
.case-content-section {
    padding: 4rem 0;
}

.case-content-section .container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 4rem;
    max-width: 1200px;
}

/* Table of Contents */
.case-toc {
    position: sticky;
    top: 120px;
    height: fit-content;
}

.case-toc h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.case-toc ul {
    list-style: none;
}

.case-toc li {
    margin-bottom: 0.75rem;
}

.case-toc a {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.9375rem;
    display: block;
    padding: 0.5rem 0;
    border-left: 2px solid transparent;
    padding-left: 1rem;
    transition: all var(--transition-base);
}

.case-toc a:hover,
.case-toc a.active {
    color: var(--primary-blue);
    border-left-color: var(--primary-blue);
}

/* Case Sections */
.case-section {
    margin-bottom: 4rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.case-section.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.case-section-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--gray-200);
}

.case-section-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--gray-200);
    line-height: 1;
}

.case-section-header h2 {
    font-size: 1.75rem;
    color: var(--primary-dark);
}

.case-section-body > p {
    font-size: 1.0625rem;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 2rem;
}

/* Challenge Grid */
.case-challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.case-challenge-item {
    background: var(--gray-100);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--error);
}

.case-challenge-item h4 {
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.case-challenge-item h4 svg {
    color: var(--error);
    flex-shrink: 0;
}

.case-challenge-item p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

/* Solution Steps */
.case-solution-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.case-solution-step {
    position: relative;
    padding-left: 3rem;
}

.case-solution-step::before {
    content: counter(step);
    counter-increment: step;
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--primary-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.case-solution-steps {
    counter-reset: step;
}

.case-solution-step h4 {
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.case-solution-step p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

/* Timeline */
.case-timeline {
    position: relative;
    padding-left: 2rem;
}

.case-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-blue), var(--accent-cyan));
}

.case-timeline-item {
    position: relative;
    padding-bottom: 2rem;
}

.case-timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0;
    width: 1rem;
    height: 1rem;
    background: var(--primary-blue);
    border-radius: 50%;
    transform: translateX(-50%);
    margin-left: -0.5px;
}

.case-timeline-item:last-child {
    padding-bottom: 0;
}

.case-timeline-date {
    font-size: 0.875rem;
    color: var(--accent-cyan);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.case-timeline-item h4 {
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.case-timeline-item p {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

/* Results Grid */
.case-section-highlight {
    background: var(--gray-100);
    padding: 3rem;
    border-radius: var(--radius-xl);
    margin-left: -2rem;
    margin-right: -2rem;
    padding-left: 2rem;
    padding-right: 2rem;
}

.case-results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.case-result-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.case-result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.case-result-label {
    color: var(--gray-600);
    font-size: 0.9375rem;
}

.case-results-summary h3 {
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

.case-results-summary p {
    color: var(--gray-700);
    line-height: 1.7;
}

/* Testimonial */
.case-testimonial-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-blue));
    padding: 3rem;
    border-radius: var(--radius-xl);
    margin-left: -2rem;
    margin-right: -2rem;
    color: var(--white);
}

.case-testimonial {
    position: relative;
    padding-top: 2rem;
}

.case-testimonial-quote {
    position: absolute;
    top: 0;
    left: 0;
    color: rgba(255, 255, 255, 0.2);
}

.case-testimonial-text {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    font-style: italic;
    padding-left: 3rem;
}

.case-testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-left: 3rem;
}

.case-testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.case-testimonial-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.case-testimonial-name {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    font-style: normal;
}

.case-testimonial-title {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Products Section */
.case-products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.case-product-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all var(--transition-base);
}

.case-product-item:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.case-product-item img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.case-product-info h4 {
    font-size: 0.9375rem;
    color: var(--primary-dark);
    margin-bottom: 0.25rem;
}

.case-product-info p {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* CTA Section */
.case-cta-section {
    background: var(--gradient-primary);
    padding: 4rem 0;
    text-align: center;
}

.case-cta-content h2 {
    color: var(--white);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.case-cta-content p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.case-cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.case-cta-buttons .btn-primary {
    background: var(--white);
    color: var(--primary-dark);
}

.case-cta-buttons .btn-primary:hover {
    background: var(--gray-100);
}

.case-cta-buttons .btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.case-cta-buttons .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Related Cases */
.case-related-section {
    padding: 4rem 0;
    background: var(--gray-100);
}

.case-related-section h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-dark);
}

.case-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.case-related-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.case-related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.case-related-card-image {
    height: 160px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-blue));
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-related-card-image svg {
    color: rgba(255, 255, 255, 0.5);
}

.case-related-card-content {
    padding: 1.5rem;
}

.case-related-card-tag {
    font-size: 0.75rem;
    color: var(--accent-cyan);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.case-related-card h4 {
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
    font-size: 1.0625rem;
}

.case-related-card p {
    color: var(--gray-600);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 1024px) {
    .case-content-section .container {
        grid-template-columns: 1fr;
    }
    
    .case-toc {
        position: static;
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
        margin-bottom: 2rem;
        padding-bottom: 2rem;
        border-bottom: 1px solid var(--gray-200);
    }
    
    .case-toc h4 {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .case-toc ul {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .case-toc li {
        margin-bottom: 0;
    }
    
    .case-toc a {
        padding: 0.5rem 1rem;
        border: 1px solid var(--gray-200);
        border-radius: 2rem;
        font-size: 0.8125rem;
    }
    
    .case-toc a:hover {
        border-color: var(--primary-blue);
        background: var(--gray-100);
    }
}

@media (max-width: 768px) {
    .case-hero {
        padding: 3rem 0 4rem;
    }
    
    .case-hero h1 {
        font-size: 1.75rem;
    }
    
    .case-summary {
        font-size: 1rem;
    }
    
    .case-key-stats {
        gap: 1.5rem;
    }
    
    .case-stat-value {
        font-size: 2rem;
    }
    
    .case-section-header h2 {
        font-size: 1.5rem;
    }
    
    .case-section-number {
        font-size: 2rem;
    }
    
    .case-section-highlight,
    .case-testimonial-section {
        margin-left: -1rem;
        margin-right: -1rem;
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.case-section.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

.case-section:nth-child(2).animate-in { animation-delay: 0.1s; }
.case-section:nth-child(3).animate-in { animation-delay: 0.2s; }
.case-section:nth-child(4).animate-in { animation-delay: 0.3s; }
.case-section:nth-child(5).animate-in { animation-delay: 0.4s; }
.case-section:nth-child(6).animate-in { animation-delay: 0.5s; }