/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(180deg, #F9F9F9 0%, #FFFFFF 100%);
    padding: 40px 20px;
}

/* Case Study Section */
.case-study {
    max-width: 1600px;
    margin: 0 auto;
}

.case-study-container {
    background: #FFFFFF;
    padding: 60px 40px;
    border-radius: 12px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.08);
}

/* Header */
.case-study-header {
    text-align: center;
    margin-bottom: 60px;
    padding-bottom: 40px;
    border-bottom: 3px solid #F4D03F;
}

.case-label {
    display: inline-block;
    background: #F4D03F;
    color: #000000;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.case-title {
    font-size: 3rem;
    color: #000000;
    margin-bottom: 15px;
    font-weight: 700;
}

.case-subtitle {
    font-size: 1.5rem;
    color: #4A4A4A;
    margin-bottom: 30px;
    font-weight: 400;
}

.case-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 30px;
    margin-top: 30px;
}

.meta-item {
    font-size: 1rem;
    color: #666666;
}

.meta-item strong {
    color: #000000;
    font-weight: 600;
}

/* Columns Grid */
.columns-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.column {
    background: #FAFAFA;
    padding: 35px 25px;
    border-radius: 12px;
    border-top: 5px solid #F4D03F;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

/* Hover Effect */
.column::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(244, 208, 63, 0.1) 0%, rgba(218, 165, 32, 0.1) 100%);
    transition: left 0.5s ease;
    z-index: 0;
}

.column:hover::before {
    left: 0;
}

.column:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(244, 208, 63, 0.3);
    border-top-color: #DAA520;
}

.column > * {
    position: relative;
    z-index: 1;
}

/* Column Icon */
.column-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}

.column-title {
    font-size: 1.5rem;
    color: #000000;
    margin-bottom: 20px;
    font-weight: 600;
    text-align: center;
    padding-bottom: 15px;
    border-bottom: 2px solid #F4D03F;
}

/* Column Content */
.column-content {
    font-size: 0.95rem;
    color: #4A4A4A;
    line-height: 1.8;
}

.column-content h4 {
    font-size: 1.125rem;
    color: #000000;
    margin: 20px 0 10px;
    font-weight: 600;
}

.column-content p {
    margin-bottom: 15px;
}

.column-content ul {
    margin: 10px 0 15px 20px;
    list-style: none;
}

.column-content ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
}

.column-content ul li::before {
    content: '►';
    position: absolute;
    left: 0;
    color: #F4D03F;
    font-size: 0.75rem;
}

.column-content strong {
    color: #F4D03F;
    font-weight: 700;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .columns-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .case-study-container {
        padding: 40px 25px;
    }

    .case-title {
        font-size: 2rem;
    }

    .case-subtitle {
        font-size: 1.125rem;
    }

    .case-meta {
        flex-direction: column;
        gap: 15px;
    }

    .columns-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .column {
        padding: 30px 20px;
    }

    .column-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .case-title {
        font-size: 1.75rem;
    }

    .case-subtitle {
        font-size: 1rem;
    }

    .column-content {
        font-size: 0.9rem;
    }
}