:root {
    --primary: #0c70f2;
    --primary-dark: #0a5dd1;
    --primary-light: #3b82f6;
    --dark-blue: #0a192f;
    --dark-blue-light: #112240;
    --slate-gray: #64748b;
    --slate-light: #94a3b8;
    --light-gray: #f1f5f9;
    --white: #ffffff;
    --shadow-light: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-medium: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-large: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    scroll-behavior: smooth;
}

.tech-section {
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    padding: 4rem 3rem;
    box-shadow: var(--shadow-large);
    border: 1px solid rgba(12, 112, 242, 0.1);
    position: relative;
    overflow: hidden;
}

.tech-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--dark-blue));
    border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--dark-blue), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--dark-blue));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--slate-gray);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
    font-weight: 500;
}

/* Category Tabs - Professional Design */
.category-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    background: var(--light-gray);
    border-radius: var(--border-radius-lg);
    padding: 6px;
    flex-wrap: wrap;
    gap: 4px;
    box-shadow: inset var(--shadow-light);
}

.tab-button {
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius-md);
    background: transparent;
    color: var(--slate-gray);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
    min-width: 140px;
}

.tab-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s;
}

.tab-button:hover::before {
    left: 100%;
}

.tab-button.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.tab-button:hover:not(.active) {
    background: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
    color: var(--primary);
}

/* Skills Grid - Enhanced Design */
.skills-container {
    position: relative;
    min-height: 500px;
    overflow: hidden;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 2rem;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.skills-grid.active {
    opacity: 1;
    transform: translateY(0);
}

.skill-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: var(--border-radius-xl);
    padding: 2.5rem 2rem;
    text-align: center;
    border: 2px solid transparent;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(12, 112, 242, 0.1), transparent);
    transition: left 0.6s;
}

.skill-card:hover::before {
    left: 100%;
}

.skill-card:hover {
    transform: translateY(-12px) scale(1.03);
    border-color: var(--primary);
    box-shadow: var(--shadow-large);
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
}

.skill-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-light);
    position: relative;
}

.skill-icon::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius-lg);
    padding: 2px;
    background: linear-gradient(135deg, var(--primary), transparent, var(--dark-blue));
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s;
}

.skill-card:hover .skill-icon {
    transform: scale(1.15) rotate(5deg);
    background: linear-gradient(135deg, var(--primary)/20 0%, var(--dark-blue)/20 100%);
}

.skill-card:hover .skill-icon::after {
    opacity: 1;
}

.skill-icon img {
    width: 45px;
    height: 45px;
    object-fit: contain;
    transition: all 0.3s ease;
}

.skill-card:hover .skill-icon img {
    filter: brightness(1.1) saturate(1.2);
}

.skill-name {
    font-weight: 700;
    color: var(--dark-blue);
    font-size: 1rem;
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.skill-card:hover .skill-name {
    color: var(--primary);
}

.skill-level {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: auto;
}

.level-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #cbd5e1;
    transition: all 0.3s ease;
    position: relative;
}

.level-dot.filled {
    background: var(--primary);
    box-shadow: 0 0 8px rgba(12, 112, 242, 0.3);
}

.skill-card:hover .level-dot.filled {
    background: var(--dark-blue);
    transform: scale(1.2);
    box-shadow: 0 0 12px rgba(10, 25, 47, 0.4);
}

/* Enhanced Stats Summary - Professional Theme */
.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-top: 5rem;
    padding-top: 4rem;
    border-top: 2px solid var(--light-gray);
    position: relative;
}

.stats-summary::before {
    content: '';
    position: absolute;
    top: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--dark-blue));
    border-radius: 2px;
}

.stat-card {
    text-align: center;
    padding: 3rem 2.5rem;
    background: white;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius-xl);
    color: var(--dark-blue);
    position: relative;
    overflow: hidden;
    transform: translateY(30px);
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    box-shadow: var(--shadow-medium);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(12, 112, 242, 0.08), transparent);
    transition: left 0.8s;
}

.stat-card:hover::before {
    left: 100%;
}

.stat-card:hover {
    transform: translateY(-15px);
    border-color: var(--primary);
    box-shadow: var(--shadow-large);
    background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
}

.stat-card.animate-in {
    transform: translateY(0);
    opacity: 1;
}

.stat-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--dark-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    transform: scale(0);
    transition: transform 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    color: white;
    box-shadow: var(--shadow-medium);
    position: relative;
}

.stat-icon::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary), var(--dark-blue), var(--primary));
    z-index: -1;
    opacity: 0;
    transition: opacity 0.4s;
}

.stat-card:hover .stat-icon::after {
    opacity: 0.3;
}

.stat-card.animate-in .stat-icon {
    transform: scale(1);
}

.stat-card:hover .stat-icon {
    transform: scale(1.1) rotate(10deg);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    position: relative;
    color: var(--dark-blue);
    text-shadow: none;
    transition: color 0.3s ease;
}

.stat-card:hover .stat-number {
    color: var(--primary);
}

.stat-number::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--dark-blue));
    border-radius: 2px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-card.animate-in .stat-number::after {
    width: 80px;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--slate-gray);
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: color 0.3s ease;
}

.stat-card:hover .stat-label {
    color: var(--dark-blue);
}

/* Professional pulsing effect */
@keyframes statPulse {

    0%,
    100% {
        box-shadow: var(--shadow-medium);
        border-color: var(--light-gray);
    }

    50% {
        box-shadow: var(--shadow-large);
        border-color: var(--primary);
    }
}

.stat-card.counting {
    animation: statPulse 2.5s ease-in-out;
}

/* Sophisticated card backgrounds */
.stat-card:nth-child(1) {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
}

.stat-card:nth-child(2) {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.stat-card:nth-child(3) {
    background: linear-gradient(135deg, #f1f5f9 0%, #ffffff 100%);
}

/* Floating Animation - Reduced for professionalism */
@keyframes gentleFloat {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-5px);
    }
}

.skill-card:nth-child(6n+1) {
    animation: gentleFloat 8s ease-in-out infinite;
}

.skill-card:nth-child(6n+2) {
    animation: gentleFloat 8s ease-in-out infinite 1.3s;
}

.skill-card:nth-child(6n+3) {
    animation: gentleFloat 8s ease-in-out infinite 2.6s;
}

.skill-card:nth-child(6n+4) {
    animation: gentleFloat 8s ease-in-out infinite 4s;
}

.skill-card:nth-child(6n+5) {
    animation: gentleFloat 8s ease-in-out infinite 5.3s;
}

.skill-card:nth-child(6n) {
    animation: gentleFloat 8s ease-in-out infinite 6.6s;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .tech-section {
        padding: 3rem 2rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .tech-section {
        padding: 2rem 1.5rem;
        border-radius: var(--border-radius-lg);
    }

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

    .section-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 1.25rem;
    }

    .skill-card {
        padding: 2rem 1.5rem;
    }

    .skill-icon {
        width: 60px;
        height: 60px;
        margin-bottom: 1rem;
    }

    .skill-icon img {
        width: 35px;
        height: 35px;
    }

    .category-tabs {
        justify-content: flex-start;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
        padding: 6px 6px 6px 12px;
    }

    .category-tabs::-webkit-scrollbar {
        display: none;
    }

    .tab-button {
        padding: 12px 20px;
        font-size: 0.9rem;
        min-width: 120px;
        flex-shrink: 0;
    }

    .stats-summary {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-top: 3rem;
        padding-top: 3rem;
    }

    .stat-card {
        padding: 2.5rem 2rem;
    }

    .stat-number {
        font-size: 3rem;
    }

    .stat-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .skills-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1rem;
    }

    .skill-card {
        padding: 1.5rem 1rem;
    }

    .skill-name {
        font-size: 0.9rem;
    }

    .level-dot {
        width: 6px;
        height: 6px;
        gap: 4px;
    }
}

/* Custom scrollbar for category tabs */
.category-tabs {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--light-gray);
}

.category-tabs::-webkit-scrollbar {
    height: 4px;
}

.category-tabs::-webkit-scrollbar-track {
    background: var(--light-gray);
    border-radius: 2px;
}

.category-tabs::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 2px;
}

.category-tabs::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Accessibility improvements */
.tab-button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.skill-card:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

.stat-card:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 4px;
}

/* Print styles */
@media print {
    .tech-section {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }

    .skill-card,
    .stat-card {
        box-shadow: none;
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }

    .floating-animation,
    .skill-card:nth-child(6n+1),
    .skill-card:nth-child(6n+2),
    .skill-card:nth-child(6n+3),
    .skill-card:nth-child(6n+4),
    .skill-card:nth-child(6n+5),
    .skill-card:nth-child(6n) {
        animation: none;
    }
}

/* Animated Tech Stack for Hero Section */
.animated-tech-stack {
    margin: 2rem 0;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(12, 112, 242, 0.05) 0%, rgba(10, 25, 47, 0.05) 100%);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(12, 112, 242, 0.1);
    position: relative;
    overflow: hidden;
}

.animated-tech-stack::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(12, 112, 242, 0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.tech-stack-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

.tech-item {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--border-radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    animation: techItemAppear 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.tech-item::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 ease;
}

.tech-item:hover::before {
    left: 100%;
}

.tech-item:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 25px rgba(12, 112, 242, 0.3);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

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

@keyframes techItemAppear {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.8);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Floating animation for tech items */
.tech-item {
    animation: techItemAppear 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards, gentleFloat 3s ease-in-out infinite;
}

.tech-item:nth-child(1) { animation-delay: 0.1s, 0s; }
.tech-item:nth-child(2) { animation-delay: 0.2s, 0.2s; }
.tech-item:nth-child(3) { animation-delay: 0.3s, 0.4s; }
.tech-item:nth-child(4) { animation-delay: 0.4s, 0.6s; }
.tech-item:nth-child(5) { animation-delay: 0.5s, 0.8s; }
.tech-item:nth-child(6) { animation-delay: 0.6s, 1s; }
.tech-item:nth-child(7) { animation-delay: 0.7s, 1.2s; }
.tech-item:nth-child(8) { animation-delay: 0.8s, 1.4s; }
.tech-item:nth-child(9) { animation-delay: 0.9s, 1.6s; }

@media (max-width: 768px) {
    .tech-stack-container {
        gap: 0.5rem;
    }
    
    .tech-item {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

@media print {
    .animated-tech-stack {
        background: #f5f5f5;
        border: 1px solid #ddd;
    }
    
    .tech-item {
        background: #333 !important;
        color: white !important;
        animation: none !important;
    }
}