.header {
    text-align: center;
    margin-bottom: 50px;
    padding: 40px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
}

.header h1 {
    font-size: 36px;
    margin-bottom: 10px;
}

.header p {
    font-size: 18px;
    opacity: 0.9;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
    padding: 30px 200px;
}

.case-item {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.case-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.qr-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

.case-item:hover .qr-overlay {
    opacity: 1;
}

.qr-code {
    width: 150px;
    height: 150px;
    border-radius: 10px;
    margin-bottom: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.qr-overlay p {
    color: white;
    font-size: 14px;
    margin: 0;
    text-align: center;
}

.case-image {
    width: 100%;
    aspect-ratio: 9 / 16;
    object-fit: cover;
}

.case-content {
    padding: 25px;
}

.case-title {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 10px;
    color: #2c3e50;
}

.case-industry {
    display: inline-block;
    background: #667eea;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    margin-bottom: 15px;
}

.case-description {
    font-size: 16px;
    line-height: 1.6;
    color: #666;
    margin-bottom: 15px;
}

.case-stats {
    display: flex;
    justify-content: space-between;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

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

.stat-value {
    font-size: 20px;
    font-weight: bold;
    color: #667eea;
}

.stat-label {
    font-size: 14px;
    color: #999;
}

.nav-back {
    text-align: center;
    margin-top: 40px;
}

.nav-back a {
    display: inline-block;
    padding: 12px 30px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    transition: background 0.3s ease;
}

.nav-back a:hover {
    background: #5a6fd8;
}
.index-section-5 {
    margin-top: 0;
}