:root {
            --void-black: #000000;
            --carbon-black: #0a0a0a;
            --obsidian: #111111;
            --charcoal-deep: #1a1a1a;
            --graphite: #242424;
            --steel: #737373;
            --mist: #808080;
            --whisper: #9a9a9a;
            --pearl-gray: #a7a7a7;
            --glass-black: rgba(10, 10, 10, 0.5);
            --glass-charcoal: rgba(26, 26, 26, 0.4);
            --glass-smoke: rgba(77, 77, 77, 0.2);
            --glass-border-dark: rgba(255, 255, 255, 0.08);
            --glass-border-subtle: rgba(255, 255, 255, 0.05);
            --card-background: var(--glass-charcoal);
            --card-border: var(--glass-border-dark);
            --text-primary: var(--pearl-gray);
            --text-secondary: var(--mist);
            --text-accent: var(--whisper);
            --link-hover-background: rgba(55, 55, 55, 0.5);
            --space-sm: 0.5rem;
            --space-md: 1rem;
            --space-lg: 1.5rem;
            --space-xl: 2rem;
            --space-2xl: 3rem;
            --space-3xl: 5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-full: 9999px;
            --duration-normal: 250ms;
            --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
            --gradient-depth: linear-gradient(145deg, var(--obsidian) 0%, var(--void-black) 50%, var(--carbon-black) 100%);
        }

        /* Base & Reset */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; scroll-padding-top: 80px; }
        body {
            font-family: 'Inter', system-ui, sans-serif;
            background: var(--gradient-depth);
            color: var(--text-secondary);
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* General */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-xl);
        }
        section {
            padding: var(--space-3xl) 0;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }
        section.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .section-header {
            font-size: clamp(2rem, 5vw, 3rem);
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--space-2xl);
            text-align: center;
        }
        .section-header .accent-text { color: var(--text-accent); }
        .section-footer {
            text-align: center;
            margin-top: var(--space-2xl);
        }


        /* Navigation Bar */
        .navbar {
            position: fixed;
            top: var(--space-lg);
            left: 50%;
            transform: translateX(-50%);
            z-index: 1000;
            padding: var(--space-sm);
            background: var(--glass-charcoal);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border-dark);
            border-radius: var(--radius-full);
            transition: opacity 0.3s;
        }
        .nav-brand {
           display: none;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
        }
        .nav-link {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            transition: all var(--duration-normal) var(--ease-out);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-sm);
            padding: var(--space-md);
            border-radius: var(--radius-full);
            height: 48px;
            min-width: 48px;
        }
        .nav-link span {
            display: none;
            font-size: 0.9rem;
            white-space: nowrap;
            margin-left: -4px;
        }
        .nav-link:hover {
            color: var(--text-primary);
        }
        .nav-link.active {
            color: var(--text-primary);
            background: var(--glass-smoke);
            padding: var(--space-md) var(--space-lg);
        }
        .nav-link.active span {
            display: inline-block;
        }

        /* Hero Section */
        #home {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .hero-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            align-items: center;
            gap: var(--space-2xl);
        }

        .hero-text {
            animation: fadeIn 1s var(--ease-out) forwards;
        }

        .hero-text h1 {
            font-size: clamp(2.5rem, 6vw, 4.5rem);
            font-weight: 800;
            line-height: 1.1;
            color: var(--text-primary);
        }
        .hero-text h1 .accent-text { color: var(--text-accent); }
        .hero-text p {
            font-size: clamp(1rem, 2.5vw, 1.25rem);
            margin: var(--space-lg) 0 var(--space-2xl);
            max-width: 500px;
        }
        .hero-buttons { display: flex; gap: var(--space-md); }
        
        .hero-illustration {
            animation: float 4s ease-in-out infinite, fadeIn 1s 0.3s var(--ease-out) forwards;
            opacity: 0;
        }
        
        .hero-illustration svg {
            max-width: 100%;
            height: auto;
        }

        @keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
        @keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: var(--space-md) var(--space-xl);
            border-radius: var(--radius-full);
            font-weight: 500;
            text-decoration: none;
            border: 1px solid var(--glass-border-subtle);
            transition: all var(--duration-normal) var(--ease-out);
        }
        .btn-primary { background: var(--text-accent); color: var(--void-black); border-color: var(--text-accent); }
        .btn-primary:hover { background: var(--pearl-gray); border-color: var(--pearl-gray); }
        .btn-secondary { background: var(--glass-smoke); color: var(--text-primary); }
        .btn-secondary:hover { background: var(--link-hover-background); }

        /* About Section */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-3xl);
            align-items: center;
        }
        .about-text h2 { font-size: 2.5rem; margin-bottom: var(--space-lg); color: var(--text-primary); }
        .about-text p { line-height: 1.8; margin-bottom: var(--space-md); }
        .about-image {
            display: flex;
            align-items: center;
            justify-content: center;
        }
         .about-image svg {
            max-width: 80%;
            height: auto;
        }

        /* Skills Slider */
        .skills-slider { position: relative; background: rgba(0,0,0,0.2); border-radius: var(--radius-lg); padding: var(--space-lg) 0; overflow: hidden; }
        .skills-slider::before, .skills-slider::after { content: ''; position: absolute; top: 0; bottom: 0; width: 150px; z-index: 2; pointer-events: none; }
        .skills-slider::before { left: 0; background: linear-gradient(to right, var(--charcoal-deep) 20%, transparent 100%); }
        .skills-slider::after { right: 0; background: linear-gradient(to left, var(--charcoal-deep) 20%, transparent 100%); }
        .skills-slide-track { display: flex; width: calc(150px * 20); animation: scroll 40s linear infinite; }
        @keyframes scroll { 0% { transform: translateX(0); } 100% { transform: translateX(calc(-150px * 10)); } }
        .skill-item { width: 150px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-sm); color: var(--text-secondary); transition: all var(--duration-normal) var(--ease-out); }
        .skill-item i { font-size: 3rem; }
        .skill-item span { font-weight: 500; font-size: 0.9rem; }
        .skill-item:hover { transform: scale(1.1); color: var(--text-primary); }

        /* Projects & Certificates */
        .filter-nav { display: flex; justify-content: center; gap: var(--space-sm); margin-bottom: var(--space-2xl); flex-wrap: wrap; }
        .filter-btn { background: var(--glass-smoke); border: 1px solid var(--glass-border-subtle); color: var(--text-secondary); padding: var(--space-sm) var(--space-lg); border-radius: var(--radius-full); cursor: pointer; font-weight: 500; transition: all var(--duration-normal) var(--ease-out); }
        .filter-btn:hover { background: var(--link-hover-background); border-color: var(--glass-border-dark); color: var(--text-primary); }
        .filter-btn.active { background: var(--text-accent); color: var(--void-black); border-color: var(--text-accent); }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-xl); }
        .card { background: var(--card-background); backdrop-filter: blur(20px) saturate(150%); border: 1px solid var(--card-border); border-radius: var(--radius-lg); overflow: hidden; transition: all var(--duration-normal) var(--ease-out); box-shadow: 0 10px 30px -10px rgba(0,0,0,0.4); display: flex; flex-direction: column; }
        .card:hover { transform: translateY(-8px) scale(1.03); box-shadow: 0 20px 40px -10px rgba(0,0,0,0.5); border-color: var(--glass-border-dark); }
        .card img { width: 100%; height: 220px; object-fit: cover; display: block; }
        .card-content { padding: var(--space-lg); flex-grow: 1; display: flex; flex-direction: column; }
        .card-content h3 { font-size: 1.35rem; font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-sm); }
        .card-content p { font-size: 1rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: var(--space-lg); flex-grow: 1; }
        .card-footer { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }
        .action-links { display: flex; gap: var(--space-md); }
        .action-link, .download-btn { display: inline-flex; align-items: center; gap: var(--space-sm); padding: var(--space-sm) var(--space-md); background: var(--glass-smoke); border: 1px solid var(--glass-border-subtle); border-radius: var(--radius-md); color: var(--text-secondary); text-decoration: none; transition: all var(--duration-normal) var(--ease-out); }
        .action-link:hover, .download-btn:hover { background: var(--link-hover-background); color: var(--text-primary); transform: scale(1.05); }

        /* Contact Section */
        .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3xl); align-items: center; }
        .contact-info .contact-image { display: flex; align-items: center; justify-content: center; }
         .contact-info .contact-image svg { max-width: 70%; height: auto; }
        .contact-form { display: flex; flex-direction: column; gap: var(--space-lg); }
        .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
        .form-group { display: flex; flex-direction: column; }
        .form-group.full-width { grid-column: 1 / -1; }
        .form-group input, .form-group textarea, .form-group select { width: 100%; padding: var(--space-md); border-radius: var(--radius-lg); border: 1px solid var(--glass-border-dark); background: var(--glass-black); color: var(--text-primary); font-size: 1rem; font-family: inherit; -webkit-appearance: none; -moz-appearance: none; appearance: none; }
        .form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--steel); box-shadow: 0 0 0 3px rgba(115, 115, 115, 0.1); }
        .form-group textarea { resize: vertical; min-height: 120px; }
        .form-group label { margin-bottom: var(--space-sm); font-size: 0.9rem; color: var(--text-secondary); }
        .form-group select { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%239a9a9a' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e"); background-position: right 0.75rem center; background-repeat: no-repeat; background-size: 1.5em 1.5em; padding-right: 2.5rem; }

        /* Footer */
        .footer { padding: var(--space-2xl) 0; text-align: center; border-top: 1px solid var(--glass-border-dark); margin-top: var(--space-3xl); }
        .footer-nav { display: flex; justify-content: center; gap: var(--space-xl); margin-bottom: var(--space-lg); }
        .footer-nav a { color: var(--text-secondary); text-decoration: none; font-weight: 500; transition: color var(--duration-normal) var(--ease-out); }
        .footer-nav a:hover { color: var(--text-primary); }
        .social-icons { display: flex; justify-content: center; gap: var(--space-md); }
        .social-icon { display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; background: var(--glass-smoke); border: 1px solid var(--icon-border); border-radius: var(--radius-full); color: var(--text-secondary); text-decoration: none; transition: all var(--duration-normal) var(--ease-out); }
        .social-icon:hover { background: var(--link-hover-background); color: var(--text-primary); transform: translateY(-2px); }

        /* Responsive */
        @media (max-width: 768px) {
            html { scroll-padding-top: 20px; }
            .hero-grid { grid-template-columns: 1fr; text-align: center; }
             .hero-text { order: 2; }
             .hero-illustration { order: 1; margin-bottom: var(--space-xl); }
             .hero-buttons { justify-content: center; }
            .about-grid, .contact-grid { grid-template-columns: 1fr; }
            .about-image { margin-top: var(--space-xl); order: -1; }
            .form-row { grid-template-columns: 1fr; }
            .contact-info { display: none; }
        }