.case-page {
    background: #f4f7fb;
    padding: 120px 0 80px;
}

.case-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.case-breadcrumbs {
    font-size: 0.9rem;
    color: #6b7280;
    margin-bottom: 1.5rem;
}

.case-breadcrumbs a {
    color: #00BFA5;
    text-decoration: none;
}

.case-breadcrumbs span {
    margin: 0 0.5rem;
}

.case-article {
    background: #fff;
    border-radius: 20px;
    padding: 2.2rem 2.4rem;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(15, 23, 42, 0.05);
}

.case-header h1 {
    font-size: 2.1rem;
    margin-bottom: 0.75rem;
    color: #0f172a;
}

.case-meta {
    font-size: 0.85rem;
    color: #9ca3af;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 0.9rem;
}

.case-summary {
    background: #f1f5f9;
    border-radius: 12px;
    padding: 1rem 1.2rem;
    color: #4b5563;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.case-content {
    font-size: 1rem;
    color: #111827;
    line-height: 2.8;
}

.case-content img {
    max-width: 100%;
    height: auto;
}

.case-footer {
    margin-top: 2.4rem;
    border-top: 1px solid #e5e7eb;
    padding-top: 1.6rem;
}

.case-nav p {
    margin: 0.2rem 0;
    color: #4b5563;
}

.case-nav a {
    color: #00BFA5;
    text-decoration: none;
}

.case-nav a:hover {
    text-decoration: underline;
}

.case-related {
    margin-top: 1.8rem;
}

.case-related h2 {
    font-size: 1.1rem;
    margin-bottom: 0.6rem;
    color: #0f172a;
}

.case-related ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.case-related li {
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}

.case-related li a {
    color: #374151;
    text-decoration: none;
}

.case-related li a:hover {
    color: #00BFA5;
}

.case-paywall a {
    color: #b91c1c;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(45deg, #00BFA5, #26A69A);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.25);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    .case-page {
        padding-top: 100px;
    }

    .case-article {
        padding: 1.6rem 1.4rem;
        border-radius: 16px;
    }

    .case-header h1 {
        font-size: 1.6rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}