/* ===== R&D Section ===== */
.rnd {
    width: 100%;
    background-color: var(--bg-bluish-white);
    padding: 10rem 1rem;
    position: relative;
}

.rnd-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.rnd-header {
    text-align: center;
    margin-bottom: 5rem;
}

.rnd-section {
    margin-bottom: 6rem;
}

.rnd-section:last-child {
    margin-bottom: 0;
}

.rnd-section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--black);
    margin-bottom: 2.5rem;
    position: relative;
    display: inline-block;
}

.rnd-section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue-dark), var(--accent-blue-light));
    border-radius: 2px;
}

/* Solutions Grid */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.solution-card {
    background: var(--bg-bluish-white);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.4s ease;
    border: 1px solid rgba(0, 71, 153, 0.1);
}

.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 71, 153, 0.15);
    border-color: var(--accent-blue-light);
}

.solution-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-blue-dark), var(--accent-blue-light));
    color: var(--white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.solution-logo {
    width: 70px;
    height: 70px;
    border-radius: 16px;
    object-fit: cover;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 15px rgba(0, 71, 153, 0.15);
    transition: all 0.3s ease;
}

.solution-card:hover .solution-logo {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 71, 153, 0.25);
}

.solution-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 1rem;
}

.solution-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-dark);
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.solution-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.solution-tag {
    padding: 0.4rem 0.875rem;
    background: rgba(0, 71, 153, 0.1);
    border-radius: 15px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent-blue-dark);
}

.solution-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-blue-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s ease;
}

.solution-link:hover {
    gap: 0.75rem;
    color: var(--accent-blue-light);
}

/* Research Grid */
.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.research-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(0, 71, 153, 0.1);
    transition: all 0.4s ease;
    position: relative;
}

.research-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(0, 71, 153, 0.05), rgba(1, 142, 239, 0.05));
    border: 2px solid rgba(0, 71, 153, 0.2);
}

.research-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 71, 153, 0.15);
}

.research-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: var(--accent-blue-dark);
    color: var(--white);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.research-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.research-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-dark);
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.research-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.research-date,
.research-status {
    font-size: 0.875rem;
    color: var(--gray-dark);
    opacity: 0.8;
}

.research-status {
    font-weight: 600;
    color: var(--accent-blue-dark);
}

.research-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-blue-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s ease;
}

.research-link:hover {
    gap: 0.75rem;
    color: var(--accent-blue-light);
}

/* Responsive */
@media (max-width: 1024px) {
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .research-card.featured {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .rnd {
        padding: 6rem 1rem;
    }
    
    .rnd-header {
        margin-bottom: 3rem;
    }
    
    .rnd-section {
        margin-bottom: 4rem;
    }
    
    .solutions-grid,
    .research-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .research-card.featured {
        grid-column: span 1;
    }
    
    .solution-card,
    .research-card {
        padding: 2rem;
    }
    
    .research-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .rnd {
        padding: 5rem 0.75rem;
    }
    
    .rnd-section {
        margin-bottom: 3rem;
    }
    
    .rnd-section-title {
        font-size: 1.5rem;
    }
    
    .solution-card,
    .research-card {
        padding: 1.5rem;
    }
    
    .solution-icon {
        width: 50px;
        height: 50px;
        font-size: 0.8125rem;
    }
    
    .solution-logo {
        width: 60px;
        height: 60px;
        border-radius: 14px;
    }
}