.portfolio-section {
    background: var(--bg-white);
    padding: 6rem 0;
    position: relative;
    min-height: 100vh;
}

/* .portfolio-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.03) 0%, rgba(37, 99, 235, 0.05) 100%);
    z-index: 0;
} */

.portfolio-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* Premium Header */
.section-header {
    text-align: center;
    margin-bottom: 5rem;
    position: relative;
}

.section-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.section-subtitle {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.section-description {
    font-size: clamp(1.125rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
    font-weight: 400;
}

/* Luxury Portfolio Card */
.portfolio-card {
    background: var(--bg-white);
    border-radius: 32px;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--border-light);
    overflow: hidden;
    position: relative;
}

.portfolio-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(14, 165, 233, 0.5), transparent);
}

/* Premium Main Navigation */
.main-nav-container {
    background: linear-gradient(135deg, var(--bg-lighter) 0%, var(--bg-light) 100%);
    padding: 2rem;
    border-bottom: 1px solid var(--border-light);
    position: relative;
}

.main-nav {
    display: flex;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
    justify-content: center;
}

.main-nav-item {
    background: var(--bg-white);
    border: 2px solid var(--border-light);
    border-radius: 24px;
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-elegant);
    min-height: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    group: true;
}

.main-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    transform: translateY(100%);
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 0;
}

.main-nav-item .nav-content {
    position: relative;
    z-index: 2;
    transition: var(--transition-fast);
}

.main-nav-item .nav-icon {
    font-size: 2.5rem;
    color: #0ea5e9;
    margin-bottom: 1rem;
    transition: var(--transition-fast);
}

.main-nav-item .nav-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: var(--transition-fast);
}

.main-nav-item .nav-subtitle {
    font-size: 0.875rem;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition-fast);
}

.main-nav-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-blue);
    border-color: #0ea5e9;
}

.main-nav-item:hover::before {
    transform: translateY(0);
}

.main-nav-item:hover .nav-content,
.main-nav-item.active .nav-content {
    color: white;
}

.main-nav-item:hover .nav-icon,
.main-nav-item.active .nav-icon {
    color: white;
    transform: scale(1.1);
}

.main-nav-item:hover .nav-title,
.main-nav-item.active .nav-title {
    color: white;
}

.main-nav-item:hover .nav-subtitle,
.main-nav-item.active .nav-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.main-nav-item.active {
    background: var(--primary-gradient);
    border-color: #0ea5e9;
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-blue);
}

.main-nav-item.active::before {
    transform: translateY(0);
}

/* Elegant Content Area */
.content-area {
    padding: 3rem;
    background: var(--bg-white);
}

.system-overview {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-lighter) 100%);
    border-radius: 20px;
    padding: 3rem;
    margin-bottom: 3rem;
    border-left: 6px solid #0ea5e9;
    box-shadow: var(--shadow-elegant);
    position: relative;
    overflow: hidden;
}

.system-overview::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.system-overview h3 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.system-overview p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
    position: relative;
    z-index: 1;
}

/* Premium Feature Navigation */
.feature-nav {
    background: var(--bg-lighter);
    border-radius: 16px;
    padding: 0.75rem;
    margin-bottom: 3rem;
    display: flex;
    gap: 0.5rem;
    box-shadow: var(--shadow-elegant);
    border: 1px solid var(--border-light);
}

.feature-nav-item {
    background: var(--bg-white);
    color: var(--text-secondary);
    border: 1px solid var(--border-lighter);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
    cursor: pointer;
    flex: 1;
    text-align: center;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.feature-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    transition: left 0.4s ease;
    z-index: 0;
}

.feature-nav-item span {
    position: relative;
    z-index: 1;
    transition: var(--transition-fast);
}

.feature-nav-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-elegant);
    border-color: #0ea5e9;
}

.feature-nav-item:hover::before,
.feature-nav-item.active::before {
    left: 0;
}

.feature-nav-item:hover span,
.feature-nav-item.active span {
    color: white;
}

.feature-nav-item.active {
    background: var(--primary-gradient);
    border-color: #0ea5e9;
    color: white;
    box-shadow: var(--shadow-elegant);
}

/* Luxury Feature Showcase */
.feature-showcase {
    background: var(--bg-white);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-luxury);
    min-height: 500px;
}

.feature-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
    display: none;
}

.feature-content.active {
    display: grid;
}

.feature-text {
    padding: 4rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
}

.feature-text h4 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.feature-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

.feature-image {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-lighter));
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.feature-image:hover img {
    transform: scale(1.1);
}

.feature-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* Premium Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    color: var(--text-secondary);
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-lighter) 100%);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-light);
    border-top: 4px solid #0ea5e9;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 2rem;
}

.loading-state h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.loading-state p {
    font-size: 1rem;
    color: var(--text-dark);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Hidden system content */
.system-content {
    display: none;
}

.system-content.active {
    display: block;
}

/* RESPONSIVE DESIGN - COMPACT ONLY ON MOBILE */

/* Large Desktop - Full Premium */
@media (min-width: 1400px) {
    .main-nav {
        gap: 2rem;
    }
    
    .main-nav-item {
        padding: 2.5rem 2rem;
        min-height: 160px;
    }
    
    .main-nav-item .nav-icon {
        font-size: 3rem;
    }
    
    .main-nav-item .nav-title {
        font-size: 1.25rem;
    }
}

/* Desktop - Premium */
@media (max-width: 1399.98px) and (min-width: 992px) {
    .main-nav-item {
        padding: 1.75rem 1.25rem;
        min-height: 130px;
    }
    
    .main-nav-item .nav-icon {
        font-size: 2.25rem;
    }
    
    .main-nav-item .nav-title {
        font-size: 1rem;
    }
}

/* Tablet - Slightly Compact */
@media (max-width: 991.98px) and (min-width: 768px) {
    .nav-subtitle{
        display: none!important;
    }

    .portfolio-section {
        padding: 4rem 0;
    }
    
    .main-nav {
        grid-template-columns: 1fr 1fr;
        gap: 1.25rem;
    }
    
    .main-nav-item {
        padding: 1.5rem 1rem;
        min-height: 120px;
        width: 33.3%;
    }
    
    .main-nav-item .nav-icon {
        font-size: 2rem;
        margin-bottom: 0.75rem;
    }
    
    .main-nav-item .nav-title {
        font-size: 0.95rem;
    }
    
    .main-nav-item .nav-subtitle {
        font-size: 0.8rem;
    }
    
    .feature-content {
        grid-template-columns: 1fr;
    }
    
    .feature-text {
        padding: 3rem;
    }
    
    .feature-image {
        min-height: 350px;
    }
}

/* Mobile - Compact */
@media (max-width: 767.98px) {
    .nav-subtitle{
        display: none!important;
    }

    .portfolio-section {
        padding: 3rem 0;
    }
    
    .portfolio-container {
        padding: 0 1rem;
    }
    
    .section-header {
        margin-bottom: 3rem;
    }
    
    .main-nav-container {
        padding: 1rem;
    }
    
    .main-nav {
        display: grid;
        gap: 0.75rem;
        overflow-x: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
        padding: 0.5rem;
        background: var(--bg-lighter);
        border-radius: 16px;
    }
    
    .main-nav::-webkit-scrollbar {
        display: none;
    }
    
    .main-nav-item {
        flex-shrink: 0;
        min-width: auto;
        width: auto;
        padding: 1rem 1.25rem;
        min-height: 90px;
        border-radius: 16px;
    }
    
    .main-nav-item .nav-icon {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }
    
    .main-nav-item .nav-title {
        font-size: 0.8rem;
        margin-bottom: 0.25rem;
        white-space: nowrap;
    }
    
    .main-nav-item .nav-subtitle {
        font-size: 0.7rem;
        white-space: nowrap;
    }
    
    .content-area {
        padding: 2rem;
    }
    
    .system-overview {
        padding: 2rem;
    }
    
    .feature-nav {
        flex-wrap: wrap;
        gap: 0.5rem;
        padding: 0.5rem;
        justify-content: center;
    }
    
    .feature-nav-item {
        flex: none;
        min-width: auto;
        width: auto;
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
        white-space: nowrap;
    }
    
    .feature-content {
        grid-template-columns: 1fr;
    }
    
    .feature-text {
        padding: 2rem;
    }
    
    .feature-image {
        min-height: 300px;
        order: -1;
    }
}

/* Small Mobile - Ultra Compact */
@media (max-width: 575.98px) {
    .nav-subtitle{
        display: none!important;
    }

    .portfolio-section {
        padding: 2rem 0;
    }
    
    .portfolio-container {
        padding: 0 0.75rem;
    }
    
    .portfolio-card {
        border-radius: 24px;
    }
    
    .main-nav-container {
        padding: 0.75rem;
    }
    
    .main-nav-item {
        padding: 1rem 1rem;
        min-height: 80px;
    }
    
    .main-nav-item .nav-icon {
        font-size: 1.25rem;
    }
    
    .main-nav-item .nav-title {
        font-size: 0.75rem;
    }
    
    .main-nav-item .nav-subtitle {
        font-size: 0.65rem;
    }
    
    .content-area {
        padding: 1.5rem;
    }
    
    .system-overview {
        padding: 1.5rem;
    }
    
    .feature-nav-item {
        padding: 0.625rem 0.875rem;
        font-size: 0.75rem;
    }
    
    .feature-text {
        padding: 1.5rem;
    }
    
    .feature-image {
        min-height: 250px;
    }
}

/* Tiny Mobile */
@media (max-width: 375px) {
    .main-nav-item {
        padding: 0.875rem 0.75rem;
        min-height: 75px;
    }
    
    .main-nav-item .nav-icon {
        font-size: 1.1rem;
    }
    
    .main-nav-item .nav-title {
        font-size: 0.7rem;
    }
    
    .main-nav-item .nav-subtitle {
        font-size: 0.6rem;
    }
    
    .feature-nav-item {
        padding: 0.5rem 0.75rem;
        font-size: 0.7rem;
    }
    
    .content-area {
        padding: 1rem;
    }
    
    .system-overview {
        padding: 1.25rem;
    }
    
    .feature-text {
        padding: 1.25rem;
    }
}