/* ===================================
   Portfolio CSS - Chunk 1
   Base Styles, Variables, and Hero Section
   Gsoft Interactive Systems Ltd
   =================================== */

/* Enhanced CSS Variables for Portfolio */
:root {
    /* Portfolio Specific Colors */
    --portfolio-primary: #0066cc;
    --portfolio-secondary: #ff6b35;
    --portfolio-accent: #28a745;
    --portfolio-warning: #ffc107;
    --portfolio-danger: #dc3545;
    --portfolio-info: #17a2b8;
    
    /* Background Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    --gradient-success: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    --gradient-info: linear-gradient(135deg, #17a2b8 0%, #007bff 100%);
    --gradient-dark: linear-gradient(135deg, #343a40 0%, #6c757d 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(0, 102, 204, 0.9) 0%, rgba(26, 26, 26, 0.8) 100%);
    
    /* Portfolio Spacing */
    --portfolio-section-padding: 5rem 0;
    --portfolio-section-padding-small: 3rem 0;
    --portfolio-card-padding: 2rem;
    --portfolio-grid-gap: 2rem;
    
    /* Portfolio Typography */
    --portfolio-font-size-hero: clamp(2.5rem, 5vw, 4.5rem);
    --portfolio-font-size-section: clamp(2rem, 4vw, 3rem);
    --portfolio-font-size-card: clamp(1.25rem, 2.5vw, 1.5rem);
    
    /* Portfolio Animations */
    --portfolio-transition-fast: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --portfolio-transition-normal: 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    --portfolio-transition-slow: 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    /* Portfolio Shadows */
    --portfolio-shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --portfolio-shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.15);
    --portfolio-shadow-heavy: 0 15px 50px rgba(0, 0, 0, 0.2);
    --portfolio-shadow-colored: 0 10px 40px rgba(0, 102, 204, 0.2);
    
    /* Portfolio Border Radius */
    --portfolio-radius-small: 8px;
    --portfolio-radius-medium: 16px;
    --portfolio-radius-large: 24px;
    --portfolio-radius-xl: 32px;
}

/* Portfolio Base Styles */
.portfolio-hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    overflow: hidden;
    padding: var(--portfolio-section-padding);
}

.portfolio-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
    z-index: 1;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
}

.portfolio-hero-content {
    position: relative;
    z-index: 3;
    width: 100%;
}

.hero-text {
    text-align: center;
    color: var(--white);
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--portfolio-font-size-hero);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, #ffffff, #e3f2fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: heroTitleFade 1s ease-out;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 3rem;
    opacity: 0.95;
    font-weight: 400;
    animation: heroSubtitleFade 1s ease-out 0.3s both;
}

.portfolio-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    animation: heroStatsFade 1s ease-out 0.6s both;
}

.portfolio-stats .stat-item {
    text-align: center;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--portfolio-radius-medium);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--portfolio-transition-normal);
}

.portfolio-stats .stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: var(--portfolio-shadow-medium);
}

.portfolio-stats .stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--portfolio-secondary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.portfolio-stats .stat-label {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Portfolio Filter Section */
.portfolio-filter-section {
    padding: var(--portfolio-section-padding-small);
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.portfolio-filter {
    text-align: center;
}

.filter-title {
    font-size: var(--portfolio-font-size-section);
    color: var(--dark-color);
    margin-bottom: 2rem;
    font-weight: 700;
    position: relative;
}

.filter-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-secondary);
    border-radius: 2px;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.filter-btn {
    padding: 12px 24px;
    border: 2px solid var(--portfolio-primary);
    background: transparent;
    color: var(--portfolio-primary);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--portfolio-transition-fast);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--portfolio-transition-fast);
    z-index: -1;
}

.filter-btn:hover::before,
.filter-btn.active::before {
    left: 0;
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--portfolio-shadow-colored);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: var(--portfolio-font-size-section);
    color: var(--dark-color);
    margin-bottom: 1rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.section-title::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 20px;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 53, 0.1), transparent);
    z-index: -1;
    border-radius: 10px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-medium);
    line-height: 1.6;
    font-weight: 400;
}

/* Container Enhancements */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Animation Keyframes */
@keyframes heroTitleFade {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes heroSubtitleFade {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 0.95;
        transform: translateY(0);
    }
}

@keyframes heroStatsFade {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Utility Classes for Animations */
.animate-fade-in {
    animation: fadeInUp 0.6s ease-out;
}

.animate-slide-left {
    animation: slideInLeft 0.6s ease-out;
}

.animate-slide-right {
    animation: slideInRight 0.6s ease-out;
}

.animate-scale {
    animation: scaleIn 0.6s ease-out;
}

/* Loading States */
.portfolio-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--gray-light);
    border-top: 4px solid var(--portfolio-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive Design for Hero and Base Elements */
@media (max-width: 768px) {
    .portfolio-hero {
        min-height: 70vh;
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }
    
    .portfolio-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        margin-top: 2rem;
    }
    
    .portfolio-stats .stat-item {
        padding: 1rem;
    }
    
    .portfolio-stats .stat-number {
        font-size: 2rem;
    }
    
    .portfolio-stats .stat-label {
        font-size: 0.85rem;
    }
    
    .filter-buttons {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .portfolio-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .filter-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        max-width: 280px;
    }
}

/* ===================================
   Portfolio CSS - Chunk 2
   Portfolio Grid, Project Cards & Hover Effects
   Gsoft Interactive Systems Ltd
   =================================== */

/* Portfolio Grid Section */
.portfolio-grid-section {
    padding: var(--portfolio-section-padding);
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 50%, #ffffff 100%);
    position: relative;
}

.portfolio-grid-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 60 60"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(0,102,204,0.05)"/></pattern></defs><rect width="60" height="60" fill="url(%23dots)"/></svg>');
    opacity: 0.3;
    pointer-events: none;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--portfolio-grid-gap);
    position: relative;
    z-index: 2;
}

/* Portfolio Item Base */
.portfolio-item {
    background: var(--white);
    border-radius: var(--portfolio-radius-large);
    overflow: hidden;
    box-shadow: var(--portfolio-shadow-light);
    transition: all var(--portfolio-transition-normal);
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    animation: portfolioItemFadeIn 0.6s ease-out forwards;
}

.portfolio-item:nth-child(1) { animation-delay: 0.1s; }
.portfolio-item:nth-child(2) { animation-delay: 0.2s; }
.portfolio-item:nth-child(3) { animation-delay: 0.3s; }
.portfolio-item:nth-child(4) { animation-delay: 0.4s; }
.portfolio-item:nth-child(5) { animation-delay: 0.5s; }
.portfolio-item:nth-child(6) { animation-delay: 0.6s; }
.portfolio-item:nth-child(7) { animation-delay: 0.7s; }
.portfolio-item:nth-child(8) { animation-delay: 0.8s; }
.portfolio-item:nth-child(9) { animation-delay: 0.9s; }

.portfolio-item:hover {
    transform: translateY(-15px);
    box-shadow: var(--portfolio-shadow-heavy);
    z-index: 10;
}

.portfolio-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    z-index: 3;
}

/* Portfolio Image Container */
.portfolio-image {
    position: relative;
    height: 280px;
    overflow: hidden;
    background: var(--gray-light);
}

.portfolio-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: transform var(--portfolio-transition-slow);
}

.portfolio-item:hover .portfolio-placeholder {
    transform: scale(1.05);
}

.placeholder-content {
    text-align: center;
    color: var(--white);
    z-index: 2;
    position: relative;
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.9;
    animation: float 3s ease-in-out infinite;
}

.placeholder-text {
    font-size: 1.5rem;
    font-weight: 700;
    opacity: 0.95;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Portfolio Overlay */
.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, 
        rgba(0, 102, 204, 0.95) 0%, 
        rgba(255, 107, 53, 0.95) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all var(--portfolio-transition-normal);
    z-index: 5;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.overlay-content {
    text-align: center;
    color: var(--white);
    padding: 2rem;
    transform: translateY(20px);
    transition: transform var(--portfolio-transition-normal);
}

.portfolio-item:hover .overlay-content {
    transform: translateY(0);
}

.overlay-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    opacity: 0;
    animation: overlayTitleSlide 0.5s ease-out 0.2s forwards;
}

.overlay-description {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: overlayDescSlide 0.5s ease-out 0.3s forwards;
}

.overlay-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    opacity: 0;
    animation: overlayButtonsSlide 0.5s ease-out 0.4s forwards;
}

.btn-overlay {
    padding: 10px 20px;
    border: 2px solid var(--white);
    background: transparent;
    color: var(--white);
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--portfolio-transition-fast);
    text-decoration: none;
    display: inline-block;
}

.btn-overlay:hover {
    background: var(--white);
    color: var(--portfolio-primary);
    transform: translateY(-2px);
}

.btn-view {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-live {
    background: rgba(255, 107, 53, 0.8);
    border-color: var(--portfolio-secondary);
}

.btn-live:hover {
    background: var(--portfolio-secondary);
    color: var(--white);
}

/* Portfolio Content */
.portfolio-content {
    padding: var(--portfolio-card-padding);
    position: relative;
}

.portfolio-header {
    margin-bottom: 1rem;
}

.portfolio-title {
    font-size: var(--portfolio-font-size-card);
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
    line-height: 1.3;
    transition: color var(--portfolio-transition-fast);
}

.portfolio-item:hover .portfolio-title {
    color: var(--portfolio-primary);
}

.portfolio-category {
    font-size: 0.85rem;
    color: var(--portfolio-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
}

.portfolio-category::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-secondary);
    transition: width var(--portfolio-transition-fast);
}

.portfolio-item:hover .portfolio-category::after {
    width: 100%;
}

.portfolio-description {
    color: var(--gray-medium);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* Technology Tags */
.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--portfolio-primary), var(--portfolio-info));
    color: var(--white);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all var(--portfolio-transition-fast);
    position: relative;
    overflow: hidden;
}

.tech-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--portfolio-secondary), var(--portfolio-warning));
    transition: left var(--portfolio-transition-fast);
}

.tech-tag:hover::before {
    left: 0;
}

.tech-tag:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

/* Portfolio Metrics */
.portfolio-metrics {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-light);
}

.metric {
    text-align: center;
    flex: 1;
}

.metric-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--portfolio-primary);
    line-height: 1;
    margin-bottom: 0.25rem;
    transition: all var(--portfolio-transition-fast);
}

.portfolio-item:hover .metric-value {
    color: var(--portfolio-secondary);
    transform: scale(1.1);
}

.metric-label {
    font-size: 0.75rem;
    color: var(--gray-medium);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

/* Category-based Color Coding */
.portfolio-item[data-category*="web"] .portfolio-title {
    position: relative;
}

.portfolio-item[data-category*="web"]::before {
    background: var(--gradient-primary);
}

.portfolio-item[data-category*="mobile"] .portfolio-title {
    position: relative;
}

.portfolio-item[data-category*="mobile"]::before {
    background: var(--gradient-success);
}

.portfolio-item[data-category*="software"] .portfolio-title {
    position: relative;
}

.portfolio-item[data-category*="software"]::before {
    background: var(--gradient-info);
}

.portfolio-item[data-category*="ai"] .portfolio-title {
    position: relative;
}

.portfolio-item[data-category*="ai"]::before {
    background: var(--gradient-dark);
}

.portfolio-item[data-category*="ecommerce"] .portfolio-title {
    position: relative;
}

.portfolio-item[data-category*="ecommerce"]::before {
    background: var(--gradient-secondary);
}

/* Hidden/Filtered Items Animation */
.portfolio-item.hidden {
    opacity: 0;
    transform: translateY(30px) scale(0.8);
    pointer-events: none;
    margin: 0;
    padding: 0;
    height: 0;
    overflow: hidden;
    transition: all var(--portfolio-transition-normal);
}

.portfolio-item.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
    transition: all var(--portfolio-transition-normal);
}

/* Floating Animation for Icons */
@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Portfolio Item Fade In Animation */
@keyframes portfolioItemFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Overlay Content Animations */
@keyframes overlayTitleSlide {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes overlayDescSlide {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes overlayButtonsSlide {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Special Featured Project Styles */
.portfolio-item.featured {
    border: 3px solid var(--portfolio-primary);
    transform: scale(1.02);
    z-index: 5;
}

.portfolio-item.featured::before {
    height: 6px;
    background: var(--gradient-secondary);
}

.portfolio-item.featured .portfolio-title {
    color: var(--portfolio-primary);
}

/* Pulse Animation for Featured Items */
.portfolio-item.featured {
    animation: featuredPulse 3s ease-in-out infinite;
}

@keyframes featuredPulse {
    0%, 100% {
        box-shadow: var(--portfolio-shadow-light);
    }
    50% {
        box-shadow: var(--portfolio-shadow-colored);
    }
}

/* Responsive Design for Portfolio Grid */
@media (max-width: 1200px) {
    .portfolio-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .portfolio-item {
        margin: 0 auto;
        max-width: 500px;
    }
    
    .portfolio-image {
        height: 250px;
    }
    
    .placeholder-icon {
        font-size: 3rem;
    }
    
    .placeholder-text {
        font-size: 1.25rem;
    }
    
    .portfolio-content {
        padding: 1.5rem;
    }
    
    .portfolio-title {
        font-size: 1.25rem;
    }
    
    .portfolio-metrics {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .metric {
        flex: none;
    }
    
    .overlay-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn-overlay {
        width: 100%;
        max-width: 200px;
    }
}

@media (max-width: 480px) {
    .portfolio-grid {
        gap: 1.5rem;
    }
    
    .portfolio-image {
        height: 220px;
    }
    
    .portfolio-content {
        padding: 1rem;
    }
    
    .placeholder-icon {
        font-size: 2.5rem;
    }
    
    .placeholder-text {
        font-size: 1rem;
    }
    
    .tech-tag {
        font-size: 0.7rem;
        padding: 4px 8px;
    }
    
    .metric-value {
        font-size: 1.1rem;
    }
    
    .metric-label {
        font-size: 0.7rem;
    }
}

/* Dark Mode Support (Optional) */
@media (prefers-color-scheme: dark) {
    .portfolio-grid-section {
        background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 50%, #1a1a1a 100%);
    }
    
    .portfolio-item {
        background: #2d2d2d;
        color: #ffffff;
    }
    
    .portfolio-title {
        color: #ffffff;
    }
    
    .portfolio-description {
        color: #cccccc;
    }
}

/* ===================================
   Portfolio CSS - Chunk 3
   Testimonials, Awards, Tech Stack & Modal Styles
   Gsoft Interactive Systems Ltd
   =================================== */

/* Testimonials Section */
.testimonials-section {
    padding: var(--portfolio-section-padding);
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.testimonials-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="testimonial-pattern" width="25" height="25" patternUnits="userSpaceOnUse"><path d="M 25 0 L 0 0 0 25" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23testimonial-pattern)"/></svg>');
    pointer-events: none;
}

.testimonials-section .section-header {
    position: relative;
    z-index: 2;
}

.testimonials-section .section-title {
    color: var(--white);
}

.testimonials-section .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    position: relative;
    z-index: 2;
}

.testimonial-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--portfolio-radius-large);
    padding: 2rem;
    transition: all var(--portfolio-transition-normal);
    position: relative;
    overflow: hidden;
}

.testimonial-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-secondary);
}

.testimonial-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.testimonial-content {
    position: relative;
    z-index: 2;
}

.testimonial-rating {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.star {
    color: #ffc107;
    font-size: 1.25rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: transform var(--portfolio-transition-fast);
}

.testimonial-item:hover .star {
    transform: scale(1.1);
}

.testimonial-text {
    color: var(--white);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-style: italic;
    position: relative;
    opacity: 0.95;
}

.testimonial-text::before {
    content: '"';
    position: absolute;
    top: -10px;
    left: -20px;
    font-size: 3rem;
    color: var(--portfolio-secondary);
    opacity: 0.5;
    font-family: serif;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-info {
    flex: 1;
}

.author-name {
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.author-role {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Awards Section */
.awards-section {
    padding: var(--portfolio-section-padding);
    background: linear-gradient(180deg, #f8f9fa 0%, #e9ecef 100%);
    position: relative;
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.award-item {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--portfolio-radius-medium);
    text-align: center;
    box-shadow: var(--portfolio-shadow-light);
    transition: all var(--portfolio-transition-normal);
    position: relative;
    overflow: hidden;
}

.award-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 4px;
    background: var(--gradient-secondary);
    transition: width var(--portfolio-transition-normal);
}

.award-item:hover::before {
    width: 100%;
}

.award-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--portfolio-shadow-medium);
}

.award-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    animation: float 3s ease-in-out infinite;
}

.award-title {
    color: var(--dark-color);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.award-organization {
    color: var(--gray-medium);
    font-size: 0.95rem;
    font-weight: 500;
}

/* Technology Stack Section */
.tech-stack-section {
    padding: var(--portfolio-section-padding);
    background: var(--white);
    position: relative;
}

.tech-categories {
    display: grid;
    gap: 3rem;
}

.tech-category {
    background: var(--gray-light);
    border-radius: var(--portfolio-radius-large);
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    transition: all var(--portfolio-transition-normal);
}

.tech-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: var(--gradient-primary);
}

.tech-category:nth-child(2)::before {
    background: var(--gradient-success);
}

.tech-category:nth-child(3)::before {
    background: var(--gradient-info);
}

.tech-category:nth-child(4)::before {
    background: var(--gradient-dark);
}

.tech-category:nth-child(5)::before {
    background: var(--gradient-secondary);
}

.tech-category:nth-child(6)::before {
    background: linear-gradient(135deg, #6f42c1 0%, #e83e8c 100%);
}

.tech-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--portfolio-shadow-medium);
}

.tech-category-title {
    color: var(--dark-color);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
}

.tech-category-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--gradient-secondary);
    border-radius: 2px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.tech-item {
    background: var(--white);
    padding: 1.5rem 1rem;
    border-radius: var(--portfolio-radius-medium);
    text-align: center;
    transition: all var(--portfolio-transition-normal);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.tech-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--portfolio-transition-normal);
    z-index: 1;
}

.tech-item:hover::before {
    left: 0;
}

.tech-item:hover {
    transform: translateY(-8px) scale(1.05);
    border-color: var(--portfolio-primary);
    color: var(--white);
    box-shadow: var(--portfolio-shadow-colored);
}

.tech-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
    position: relative;
    z-index: 2;
    transition: transform var(--portfolio-transition-fast);
}

.tech-item:hover .tech-icon {
    transform: scale(1.2) rotate(5deg);
}

.tech-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--dark-color);
    position: relative;
    z-index: 2;
    transition: color var(--portfolio-transition-fast);
}

.tech-item:hover .tech-name {
    color: var(--white);
}

/* Process Section */
.process-section {
    padding: var(--portfolio-section-padding);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.process-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-overlay);
}

.process-section .section-header {
    position: relative;
    z-index: 2;
}

.process-section .section-title {
    color: var(--white);
}

.process-section .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    position: relative;
    z-index: 2;
}

.process-step {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--portfolio-radius-large);
    padding: 2rem;
    text-align: center;
    transition: all var(--portfolio-transition-normal);
    position: relative;
}

.process-step:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--gradient-secondary);
    color: var(--white);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
}

.step-title {
    color: var(--white);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.step-description {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Portfolio CTA Section */
.portfolio-cta-section {
    padding: var(--portfolio-section-padding);
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.portfolio-cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 80 80"><defs><pattern id="cta-grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></pattern></defs><rect width="80" height="80" fill="url(%23cta-grid)"/></svg>');
    pointer-events: none;
}

.portfolio-cta-section .cta-title {
    color: var(--white);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.portfolio-cta-section .cta-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    text-align: center;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.cta-note {
    text-align: center;
}

.cta-note p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    font-style: italic;
}

/* Project Detail Modal */
.project-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.project-modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    cursor: pointer;
}

.modal-content {
    background: var(--white);
    border-radius: var(--portfolio-radius-large);
    max-width: 800px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    z-index: 2;
    box-shadow: var(--portfolio-shadow-heavy);
    transform: scale(0.8);
    opacity: 0;
    transition: all var(--portfolio-transition-normal);
}

.project-modal.active .modal-content {
    transform: scale(1);
    opacity: 1;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: var(--portfolio-primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 3;
    transition: all var(--portfolio-transition-fast);
}

.modal-close:hover {
    background: var(--portfolio-secondary);
    transform: scale(1.1);
}

.modal-body {
    padding: 2rem;
}

/* Modal Content Styles */
.modal-project-header {
    text-align: center;
    margin-bottom: 2rem;
}

.modal-project-title {
    font-size: 2rem;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.modal-project-category {
    color: var(--portfolio-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.modal-project-image {
    width: 100%;
    height: 300px;
    background: var(--gray-light);
    border-radius: var(--portfolio-radius-medium);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--gray-medium);
}

.modal-project-description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--gray-dark);
    margin-bottom: 2rem;
}

.modal-tech-stack {
    margin-bottom: 2rem;
}

.modal-tech-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.modal-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.modal-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.modal-metric {
    text-align: center;
    padding: 1rem;
    background: var(--gray-light);
    border-radius: var(--portfolio-radius-medium);
}

.modal-metric-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--portfolio-primary);
    margin-bottom: 0.25rem;
}

.modal-metric-label {
    font-size: 0.9rem;
    color: var(--gray-medium);
    text-transform: uppercase;
    font-weight: 600;
}

/* Responsive Design for Chunk 3 */
@media (max-width: 768px) {
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .testimonial-item {
        padding: 1.5rem;
    }
    
    .awards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .tech-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }
    
    .tech-item {
        padding: 1rem 0.75rem;
    }
    
    .tech-icon {
        font-size: 1.5rem;
    }
    
    .tech-name {
        font-size: 0.8rem;
    }
    
    .process-timeline {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .portfolio-cta-section .cta-title {
        font-size: 2rem;
    }
    
    .portfolio-cta-section .cta-subtitle {
        font-size: 1.1rem;
    }
    
    .modal-content {
        margin: 1rem;
        max-height: 90vh;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
    
    .modal-project-title {
        font-size: 1.5rem;
    }
    
    .modal-metrics {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    .awards-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonial-text {
        font-size: 1rem;
    }
    
    .award-icon {
        font-size: 2.5rem;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
}

/* ===================================
   Portfolio CSS - Chunk 4 (FINAL)
   Responsive Design, Advanced Animations & Polish
   Gsoft Interactive Systems Ltd
   =================================== */

/* Advanced Animation System */
@keyframes portfolioEntrance {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromBottom {
    from {
        opacity: 0;
        transform: translateY(100px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes rotateIn {
    from {
        opacity: 0;
        transform: rotate(-180deg) scale(0.5);
    }
    to {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes flipIn {
    from {
        opacity: 0;
        transform: perspective(400px) rotateY(-90deg);
    }
    to {
        opacity: 1;
        transform: perspective(400px) rotateY(0deg);
    }
}

/* Scroll-Triggered Animation Classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animate-slide-left.animated {
    opacity: 1;
    transform: translateX(0);
}

.animate-slide-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animate-slide-right.animated {
    opacity: 1;
    transform: translateX(0);
}

.animate-scale {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animate-scale.animated {
    opacity: 1;
    transform: scale(1);
}

.animate-rotate {
    opacity: 0;
    transform: rotate(-10deg);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.animate-rotate.animated {
    opacity: 1;
    transform: rotate(0deg);
}

/* Portfolio Loading States */
.portfolio-section-loading {
    position: relative;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.portfolio-section-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Advanced Filter Animation */
.portfolio-grid .portfolio-item {
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.portfolio-grid .portfolio-item.filter-hiding {
    opacity: 0;
    transform: scale(0.8) translateY(20px);
    pointer-events: none;
}

.portfolio-grid .portfolio-item.filter-showing {
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: auto;
}

/* Staggered Animation Delays */
.stagger-animation .portfolio-item:nth-child(1) { animation-delay: 0.1s; }
.stagger-animation .portfolio-item:nth-child(2) { animation-delay: 0.2s; }
.stagger-animation .portfolio-item:nth-child(3) { animation-delay: 0.3s; }
.stagger-animation .portfolio-item:nth-child(4) { animation-delay: 0.4s; }
.stagger-animation .portfolio-item:nth-child(5) { animation-delay: 0.5s; }
.stagger-animation .portfolio-item:nth-child(6) { animation-delay: 0.6s; }
.stagger-animation .portfolio-item:nth-child(7) { animation-delay: 0.7s; }
.stagger-animation .portfolio-item:nth-child(8) { animation-delay: 0.8s; }
.stagger-animation .portfolio-item:nth-child(9) { animation-delay: 0.9s; }

/* Parallax Scrolling Effects */
.parallax-section {
    position: relative;
    overflow: hidden;
}

.parallax-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 120%;
    height: 120%;
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
    will-change: transform;
}

/* Advanced Hover States */
.portfolio-item .hover-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--portfolio-transition-normal);
}

.portfolio-item:hover .hover-reveal {
    opacity: 1;
    transform: translateY(0);
}

.portfolio-item .hover-scale {
    transition: transform var(--portfolio-transition-normal);
}

.portfolio-item:hover .hover-scale {
    transform: scale(1.05);
}

.portfolio-item .hover-rotate {
    transition: transform var(--portfolio-transition-normal);
}

.portfolio-item:hover .hover-rotate {
    transform: rotate(5deg);
}

/* Particle Animation Background */
.particles-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: particleFloat 20s linear infinite;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { left: 20%; animation-delay: 2s; }
.particle:nth-child(3) { left: 30%; animation-delay: 4s; }
.particle:nth-child(4) { left: 40%; animation-delay: 6s; }
.particle:nth-child(5) { left: 50%; animation-delay: 8s; }
.particle:nth-child(6) { left: 60%; animation-delay: 10s; }
.particle:nth-child(7) { left: 70%; animation-delay: 12s; }
.particle:nth-child(8) { left: 80%; animation-delay: 14s; }
.particle:nth-child(9) { left: 90%; animation-delay: 16s; }

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* Advanced Button Animations */
.btn-portfolio {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-portfolio::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
    z-index: -1;
}

.btn-portfolio:hover::before {
    left: 100%;
}

/* Scroll Progress Indicator */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: var(--gradient-secondary);
    z-index: 9999;
    transition: width 0.3s ease;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--portfolio-transition-normal);
    z-index: 1000;
    box-shadow: var(--portfolio-shadow-medium);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--portfolio-shadow-heavy);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-light);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--portfolio-primary);
}

/* Selection Styling */
::selection {
    background: var(--portfolio-primary);
    color: var(--white);
}

::-moz-selection {
    background: var(--portfolio-primary);
    color: var(--white);
}

/* Focus Styles for Accessibility */
.portfolio-item:focus,
.filter-btn:focus,
.btn:focus,
.tech-item:focus {
    outline: 3px solid var(--portfolio-secondary);
    outline-offset: 2px;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .parallax-bg {
        transform: none !important;
    }
    
    .particle {
        display: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .portfolio-item {
        border: 2px solid var(--dark-color);
    }
    
    .filter-btn {
        border-width: 3px;
    }
    
    .tech-item {
        border: 2px solid var(--portfolio-primary);
    }
}

/* Dark Mode Enhancements */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1a1a1a;
        --dark-color: #ffffff;
        --gray-light: #2d2d2d;
        --gray-medium: #cccccc;
    }
    
    .portfolio-grid-section {
        background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 50%, #1a1a1a 100%);
    }
    
    .testimonials-section {
        background: linear-gradient(135deg, #2d2d2d 0%, #1a1a1a 100%);
    }
    
    .awards-section {
        background: linear-gradient(180deg, #2d2d2d 0%, #1a1a1a 100%);
    }
    
    .tech-stack-section {
        background: #1a1a1a;
    }
    
    .portfolio-item {
        background: #2d2d2d;
        border: 1px solid #404040;
    }
    
    .testimonial-item {
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .award-item,
    .tech-category,
    .process-step {
        background: #2d2d2d;
        border: 1px solid #404040;
    }
}

/* Responsive Design - Comprehensive Mobile Optimization */
@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: 0 1.5rem;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 1.5rem;
    }
    
    .testimonials-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
}

@media (max-width: 992px) {
    .portfolio-hero {
        min-height: 70vh;
        padding: 4rem 0;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .portfolio-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .tech-categories {
        gap: 2rem;
    }
    
    .tech-category {
        padding: 2rem;
    }
    
    .process-timeline {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .portfolio-hero {
        min-height: 60vh;
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }
    
    .portfolio-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-top: 2rem;
    }
    
    .portfolio-stats .stat-item {
        padding: 1rem;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .portfolio-item {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .portfolio-image {
        height: 220px;
    }
    
    .portfolio-content {
        padding: 1.5rem;
    }
    
    .filter-buttons {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .testimonial-item {
        padding: 1.5rem;
    }
    
    .testimonial-text {
        font-size: 1rem;
    }
    
    .awards-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .award-item {
        padding: 1.5rem;
    }
    
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .tech-item {
        padding: 1rem;
    }
    
    .tech-icon {
        font-size: 1.5rem;
    }
    
    .tech-name {
        font-size: 0.8rem;
    }
    
    .process-timeline {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .process-step {
        padding: 1.5rem;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .portfolio-cta-section .cta-title {
        font-size: 2rem;
    }
    
    .portfolio-cta-section .cta-subtitle {
        font-size: 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .back-to-top {
        bottom: 90px;
        right: 15px;
        width: 45px;
        height: 45px;
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .portfolio-hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .portfolio-stats .stat-number {
        font-size: 2rem;
    }
    
    .portfolio-stats .stat-label {
        font-size: 0.8rem;
    }
    
    .filter-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        max-width: 250px;
    }
    
    .portfolio-image {
        height: 200px;
    }
    
    .portfolio-content {
        padding: 1rem;
    }
    
    .portfolio-title {
        font-size: 1.1rem;
    }
    
    .placeholder-icon {
        font-size: 2.5rem;
    }
    
    .placeholder-text {
        font-size: 1rem;
    }
    
    .tech-tag {
        font-size: 0.7rem;
        padding: 4px 8px;
    }
    
    .metric-value {
        font-size: 1rem;
    }
    
    .overlay-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .btn-overlay {
        width: 100%;
        max-width: 180px;
    }
    
    .testimonial-text {
        font-size: 0.95rem;
    }
    
    .award-icon {
        font-size: 2.5rem;
    }
    
    .award-title {
        font-size: 1.1rem;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-height: 95vh;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .modal-project-title {
        font-size: 1.25rem;
    }
    
    .modal-project-image {
        height: 200px;
        font-size: 3rem;
    }
}

/* Print Styles */
@media print {
    .portfolio-hero,
    .filter-buttons,
    .portfolio-overlay,
    .back-to-top,
    .particles-bg,
    .modal-overlay {
        display: none !important;
    }
    
    .portfolio-item {
        break-inside: avoid;
        margin-bottom: 2rem;
    }
    
    .portfolio-grid {
        display: block;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .section-title {
        color: #000 !important;
        page-break-after: avoid;
    }
    
    .portfolio-title {
        color: #000 !important;
    }
}

/* Performance Optimizations */
.portfolio-item,
.testimonial-item,
.award-item,
.tech-item,
.process-step {
    contain: layout style paint;
    will-change: transform;
}

.portfolio-image,
.portfolio-placeholder {
    contain: layout paint;
}

/* Final Polish - Additional Utility Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-lifted {
    box-shadow: var(--portfolio-shadow-heavy);
}

.rounded-xl {
    border-radius: var(--portfolio-radius-xl);
}

.backdrop-blur {
    backdrop-filter: blur(20px);
}

.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Success State */
.success-message {
    background: var(--gradient-success);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: var(--portfolio-radius-medium);
    text-align: center;
    margin: 1rem 0;
    animation: slideInFromBottom 0.5s ease-out;
}

/* Loading State Enhancement */
.skeleton-loader {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* Final Animations for Page Load */
.page-loaded .portfolio-item {
    animation: portfolioEntrance 0.6s ease-out forwards;
}

.page-loaded .testimonial-item {
    animation: slideInFromLeft 0.8s ease-out forwards;
}

.page-loaded .award-item {
    animation: bounceIn 0.6s ease-out forwards;
}

.page-loaded .tech-item {
    animation: zoomIn 0.5s ease-out forwards;
}

.page-loaded .process-step {
    animation: slideInFromRight 0.8s ease-out forwards;
}