/* Case study page styles */

.case-hero {
    background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.9)), url('img_1.png') center/cover no-repeat !important;
    color: #fff;
    padding: 60px 24px 60px;
}

.back-link {
    display: inline-block;
    color: #94a3b8;
    text-decoration: none;
    margin-bottom: 24px;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: #fff;
}

.case-hero h1 {
    font-size: 2.2rem;
    max-width: 800px;
    line-height: 1.25;
    margin-bottom: 16px;
}

.case-hero-sub {
    font-size: 1.1rem;
    color: #94a3b8;
    max-width: 700px;
}

/* Overview grid */

.case-overview {
    padding: 40px 0;
    background: #f8fafc;
    border-bottom: 1px solid #e2e8f0;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.overview-item {
    text-align: center;
}

.overview-label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    margin-bottom: 6px;
    font-weight: 600;
}

.overview-value {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: #1a1a2e;
}

/* Case sections */

.case-section {
    padding: 64px 0;
}

.case-section.alt {
    background: #f8fafc;
}

.case-section h2 {
    text-align: left;
    font-size: 1.8rem;
    margin-bottom: 32px;
}

/* Problem block */

.problem-block {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 12px;
    padding: 32px;
}

.problem-block p {
    margin-bottom: 16px;
    color: #334155;
}

.problem-block ul {
    list-style: none;
    padding: 0;
}

.problem-block li {
    padding: 8px 0 8px 28px;
    position: relative;
    color: #334155;
}

.problem-block li::before {
    content: "\2717";
    position: absolute;
    left: 0;
    color: #dc2626;
    font-weight: 700;
}

/* Work steps */

.work-step {
    display: flex;
    gap: 24px;
    margin-bottom: 48px;
}

.work-step:last-child {
    margin-bottom: 0;
}

.work-step-num {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: #2563eb;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
}

.work-step-content {
    flex: 1;
}

.work-step-content h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.work-step-content > p {
    color: #475569;
    margin-bottom: 16px;
}

/* Tech detail blocks */

.tech-detail {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 24px;
    margin-top: 16px;
}

.tech-detail h4 {
    font-size: 0.95rem;
    color: #2563eb;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.tech-detail ul {
    list-style: none;
    padding: 0;
}

.tech-detail li {
    padding: 6px 0 6px 24px;
    position: relative;
    color: #334155;
}

.tech-detail li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: #2563eb;
    font-weight: 700;
}

/* Architecture diagram */

.arch-diagram {
    max-width: 800px;
    margin: 0 auto;
}

.arch-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
}

.arch-row-bottom {
    margin-bottom: 0;
}

.arch-arrow {
    font-size: 1.5rem;
    color: #94a3b8;
    flex-shrink: 0;
}

.arch-block {
    border-radius: 12px;
    padding: 20px 24px;
    text-align: center;
    min-width: 180px;
    flex: 1;
}

.arch-block-title {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 4px;
}

.arch-block-desc {
    font-size: 0.8rem;
    opacity: 0.8;
}

.arch-plc {
    background: #fef2f2;
    border: 2px solid #fecaca;
    color: #991b1b;
}

.arch-driver {
    background: #eff6ff;
    border: 2px solid #bfdbfe;
    color: #1e40af;
}

.arch-api {
    background: #f0fdf4;
    border: 2px solid #bbf7d0;
    color: #166534;
}

.arch-hmi {
    background: #eff6ff;
    border: 2px solid #bfdbfe;
    color: #1e40af;
}

.arch-1c {
    background: #fefce8;
    border: 2px solid #fde68a;
    color: #854d0e;
}

.arch-monitor {
    background: #f5f3ff;
    border: 2px solid #ddd6fe;
    color: #5b21b6;
}

/* CTA */

.case-cta {
    background: #0f172a !important;
    color: #fff;
    padding: 64px 0;
    text-align: center;
}

.case-cta h2 {
    color: #fff;
    margin-bottom: 16px;
}

.case-cta p {
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto 32px;
}

/* Responsive */

@media (max-width: 768px) {
    .case-hero h1 {
        font-size: 1.6rem;
    }

    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .work-step {
        flex-direction: column;
        gap: 12px;
    }

    .arch-row {
        flex-direction: column;
        gap: 8px;
    }

    .arch-arrow {
        transform: rotate(90deg);
    }

    .arch-block {
        min-width: auto;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .overview-grid {
        grid-template-columns: 1fr;
    }

    .case-section h2 {
        font-size: 1.4rem;
    }
}