:root {
            --color-bg: #f8fafc;
            --color-text: #1e293b;
            --color-accent: #3b82f6;
            --color-accent-light: #60a5fa;
            --color-secondary: #0ea5e9;
            --color-border: #e2e8f0;
            --color-card: #ffffff;
            --color-header-bg: rgba(248, 250, 252, 0.95);
            --color-code-bg: #f1f5f9;
            --font-display: 'Crimson Pro', serif;
            --font-body: 'DM Sans', sans-serif;
            --font-mono: 'JetBrains Mono', monospace;
        }

        [data-theme="dark"] {
            --color-bg: #0f172a;
            --color-text: #e2e8f0;
            --color-accent: #3b82f6;
            --color-accent-light: #60a5fa;
            --color-secondary: #0ea5e9;
            --color-border: #334155;
            --color-card: #1e293b;
            --color-header-bg: rgba(15, 23, 42, 0.95);
            --color-code-bg: #1e293b;
        }

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

        body {
            font-family: var(--font-body);
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            overflow-x: hidden;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 1.5rem 2rem;
            background: var(--color-header-bg);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--color-border);
            z-index: 1000;
            animation: slideDown 0.6s ease-out;
            transition: background-color 0.3s ease;
        }

        @keyframes slideDown {
            from {
                transform: translateY(-100%);
                opacity: 0;
            }
            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        nav {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-family: var(--font-display);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-accent);
            text-decoration: none;
            letter-spacing: -0.02em;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 2rem;
        }

        .mobile-menu-toggle {
            display: none;
            flex-direction: column;
            gap: 4px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
        }

        .mobile-menu-toggle span {
            width: 25px;
            height: 3px;
            background: var(--color-text);
            border-radius: 3px;
            transition: all 0.3s ease;
        }

        .mobile-menu-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .mobile-menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-menu-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -6px);
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            list-style: none;
        }

        .nav-links a {
            color: var(--color-text);
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s ease;
            position: relative;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--color-accent);
            transition: width 0.3s ease;
        }

        .nav-links a:hover {
            color: var(--color-accent);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        /* Theme Toggle */
        .lang-switcher {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 1rem;
            background: var(--color-card);
            border: 2px solid var(--color-border);
            border-radius: 50px;
            transition: all 0.3s ease;
        }

        .lang-switcher:hover {
            border-color: var(--color-accent);
        }

        .lang-option {
            color: var(--color-text);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.85rem;
            opacity: 0.5;
            transition: all 0.3s ease;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
        }

        .lang-option:hover {
            opacity: 0.8;
        }

        .lang-option.active {
            opacity: 1;
            color: var(--color-accent);
            background: var(--color-code-bg);
        }

        .lang-separator {
            color: var(--color-border);
            font-weight: 300;
            font-size: 0.9rem;
        }

        .theme-toggle {
            background: var(--color-card);
            border: 2px solid var(--color-border);
            border-radius: 50px;
            padding: 0.5rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            transition: all 0.3s ease;
            position: relative;
            width: 70px;
            height: 36px;
        }

        .theme-toggle:hover {
            border-color: var(--color-accent);
        }

        .theme-toggle-slider {
            position: absolute;
            width: 26px;
            height: 26px;
            background: var(--color-accent);
            border-radius: 50%;
            transition: transform 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            left: 3px;
        }

        [data-theme="dark"] .theme-toggle-slider {
            transform: translateX(34px);
        }

        /* Hero Section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 8rem 2rem 4rem;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 60%;
            height: 100%;
            background: linear-gradient(135deg,
                rgba(59, 130, 246, 0.08) 0%,
                rgba(14, 165, 233, 0.08) 100%);
            border-radius: 50% 0 0 50%;
            z-index: 0;
        }

        .hero-content {
            max-width: 1200px;
            width: 100%;
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .hero-text h1 {
            font-family: var(--font-display);
            font-size: 4.5rem;
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 1.5rem;
            color: var(--color-text);
            animation: fadeInUp 0.8s ease-out 0.2s backwards;
        }

        .hero-text .subtitle {
            font-size: 1.75rem;
            color: var(--color-accent);
            margin-bottom: 2rem;
            font-weight: 500;
            animation: fadeInUp 0.8s ease-out 0.4s backwards;
        }

        .hero-text p {
            font-size: 1.2rem;
            margin-bottom: 2.5rem;
            opacity: 0.85;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            animation: fadeInUp 0.8s ease-out 0.6s backwards;
        }

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

        .tech-stack {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
            margin-top: 3rem;
            animation: fadeInUp 0.8s ease-out 0.8s backwards;
        }

        .tech-badge {
            background: var(--color-card);
            border: 1px solid var(--color-border);
            padding: 0.75rem 1.5rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-accent);
            transition: all 0.3s ease;
        }

        .tech-badge:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(59, 130, 246, 0.2);
            border-color: var(--color-accent);
        }

        /* Sections */
        section {
            padding: 6rem 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-title {
            font-family: var(--font-display);
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 1rem;
            text-align: center;
            position: relative;
            display: inline-block;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.1rem;
            opacity: 0.7;
            margin-bottom: 4rem;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--color-accent);
            border-radius: 2px;
        }

        /* About Grid */
        .about-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .about-card {
            background: var(--color-card);
            padding: 2.5rem;
            border-radius: 20px;
            border: 1px solid var(--color-border);
            transition: all 0.3s ease;
        }

        .about-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(59, 130, 246, 0.15);
            border-color: var(--color-accent);
        }

        .about-card h3 {
            font-family: var(--font-display);
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--color-accent);
        }

        .about-card ul {
            list-style: none;
            margin-top: 1rem;
        }

        .about-card li {
            padding: 0.5rem 0;
            padding-left: 1.5rem;
            position: relative;
        }

        .about-card li::before {
            content: '▸';
            position: absolute;
            left: 0;
            color: var(--color-accent);
            font-weight: bold;
        }

        /* Projects Grid */
        .projects-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
            gap: 2.5rem;
            margin-top: 3rem;
        }

        .project-card {
            background: var(--color-card);
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid var(--color-border);
            transition: all 0.4s ease;
            position: relative;
        }

        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
            border-color: var(--color-accent);
        }

        .project-header {
            width: 100%;
            height: 200px;
            background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4rem;
            position: relative;
            overflow: hidden;
        }

        .project-header::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="rgba(255,255,255,0.1)"/></svg>');
            background-size: 50px 50px;
            opacity: 0.3;
        }

        .project-icon {
            font-size: 4rem;
            position: relative;
            z-index: 1;
            filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
        }

        .project-content {
            padding: 2rem;
        }

        .project-card h3 {
            font-family: var(--font-display);
            font-size: 1.75rem;
            margin-bottom: 0.5rem;
            color: var(--color-text);
        }

        .project-tech {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
            margin: 1rem 0;
        }

        .tech-tag {
            font-family: var(--font-mono);
            font-size: 0.75rem;
            padding: 0.25rem 0.75rem;
            background: var(--color-code-bg);
            color: var(--color-accent);
            border-radius: 4px;
            font-weight: 500;
        }

        .project-card p {
            color: var(--color-text);
            opacity: 0.8;
            margin-bottom: 1.5rem;
            line-height: 1.7;
        }

        .project-features {
            list-style: none;
            margin: 1.5rem 0;
        }

        .project-features li {
            padding: 0.5rem 0;
            padding-left: 1.5rem;
            position: relative;
            font-size: 0.95rem;
            opacity: 0.9;
        }

        .project-features li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--color-accent);
            font-weight: bold;
        }

        .project-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--color-accent);
            text-decoration: none;
            font-weight: 600;
            transition: gap 0.3s ease;
            margin-top: 1rem;
        }

        .project-link:hover {
            gap: 1rem;
        }

        .project-link::after {
            content: '→';
        }

        /* Infrastructure Section */
        .infra-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .infra-card {
            background: var(--color-card);
            padding: 2rem;
            border-radius: 15px;
            border: 2px solid var(--color-border);
            text-align: center;
            transition: all 0.3s ease;
        }

        .infra-card:hover {
            border-color: var(--color-accent);
            transform: scale(1.05);
            box-shadow: 0 8px 25px rgba(59, 130, 246, 0.2);
        }

        .infra-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
        }

        .infra-card h3 {
            font-family: var(--font-display);
            font-size: 1.5rem;
            color: var(--color-accent);
            margin-bottom: 0.5rem;
        }

        .infra-card p {
            opacity: 0.8;
            font-size: 0.95rem;
        }

        /* Code Block */
        .code-block {
            background: var(--color-code-bg);
            border: 1px solid var(--color-border);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
            font-family: var(--font-mono);
            font-size: 0.9rem;
            overflow-x: auto;
            line-height: 1.6;
        }

        .code-block code {
            color: var(--color-text);
        }

        /* Links Section */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .stat-card {
            background: var(--color-card);
            padding: 2.5rem 1.5rem;
            border-radius: 20px;
            border: 1px solid var(--color-border);
            text-align: center;
            transition: all 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(59, 130, 246, 0.2);
            border-color: var(--color-accent);
        }

        .stat-icon {
            font-size: 2.5rem;
            color: var(--color-accent);
            margin-bottom: 1rem;
        }

        .stat-number {
            font-family: var(--font-display);
            font-size: 3rem;
            font-weight: 700;
            color: var(--color-accent);
            line-height: 1;
            margin-bottom: 0.5rem;
        }

        .stat-label {
            font-size: 1rem;
            font-weight: 500;
            opacity: 0.8;
        }

        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 3rem;
        }

        .link-card {
            background: var(--color-card);
            padding: 2rem;
            border-radius: 15px;
            border: 2px solid var(--color-border);
            text-align: center;
            text-decoration: none;
            color: var(--color-text);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
        }

        .link-card:hover {
            border-color: var(--color-accent);
            transform: scale(1.05);
            box-shadow: 0 8px 25px rgba(59, 130, 246, 0.25);
        }

        .link-icon {
            font-size: 2.5rem;
        }

        .link-card h3 {
            font-family: var(--font-display);
            font-size: 1.3rem;
            color: var(--color-accent);
            margin: 0;
        }

        .link-card p {
            font-size: 0.9rem;
            opacity: 0.7;
            margin: 0;
        }

        /* Footer */
        footer {
            background: var(--color-card);
            color: var(--color-text);
            padding: 3rem 2rem;
            text-align: center;
            transition: background-color 0.3s ease, color 0.3s ease;
            border-top: 1px solid var(--color-border);
        }

        footer p {
            opacity: 0.8;
        }

        footer a {
            color: var(--color-accent);
            text-decoration: none;
            opacity: 0.8;
            transition: opacity 0.2s;
        }

        footer a:hover {
            opacity: 1;
            text-decoration: underline;
        }

        /* Privacy Policy Page */
        .privacy-content {
            padding: 8rem 2rem 4rem;
            max-width: 800px;
            margin: 0 auto;
            line-height: 1.8;
        }

        .privacy-content h1 {
            font-family: var(--font-display);
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 2rem;
        }

        .privacy-content h2 {
            font-family: var(--font-display);
            font-size: 1.5rem;
            font-weight: 600;
            margin-top: 2.5rem;
            margin-bottom: 0.75rem;
            color: var(--color-accent);
        }

        .privacy-content p {
            margin-bottom: 1rem;
            opacity: 0.85;
        }

        .privacy-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }

        .privacy-content th,
        .privacy-content td {
            padding: 12px 16px;
            text-align: left;
            border-bottom: 1px solid var(--color-border);
        }

        .privacy-content th {
            font-weight: 600;
            border-bottom-width: 2px;
        }

        .privacy-content code {
            background: var(--color-code-bg);
            padding: 2px 6px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.85em;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .mobile-menu-toggle {
                display: flex;
                z-index: 1001;
            }

            .nav-right {
                position: fixed;
                top: 0;
                right: -100%;
                height: 100vh;
                width: 80%;
                max-width: 300px;
                background: var(--color-header-bg);
                backdrop-filter: blur(10px);
                flex-direction: column;
                justify-content: flex-start;
                padding: 5rem 2rem 2rem;
                gap: 2rem;
                transition: right 0.3s ease;
                border-left: 1px solid var(--color-border);
                z-index: 999;
            }

            .nav-right.active {
                right: 0;
            }

            .nav-links {
                flex-direction: column;
                gap: 1.5rem;
                width: 100%;
            }

            .nav-links a {
                font-size: 1.1rem;
                padding: 0.5rem 0;
            }

            .hero-text h1 {
                font-size: 2.5rem;
            }

            .hero-text .subtitle {
                font-size: 1.2rem;
            }

            .lang-switcher {
                padding: 0.4rem 0.75rem;
            }

            .lang-option {
                font-size: 0.75rem;
                padding: 0.2rem 0.4rem;
            }

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

            .projects-grid,
            .links-grid,
            .infra-grid {
                grid-template-columns: 1fr;
            }

            .tech-stack {
                gap: 0.75rem;
            }

            .tech-badge {
                font-size: 0.8rem;
                padding: 0.5rem 1rem;
            }
        }

        /* Scroll animations */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 0.8s ease-out forwards;
        }

        .stagger-1 { animation-delay: 0.1s; }
        .stagger-2 { animation-delay: 0.2s; }
        .stagger-3 { animation-delay: 0.3s; }
        .stagger-4 { animation-delay: 0.4s; }
        .stagger-5 { animation-delay: 0.5s; }
        .stagger-6 { animation-delay: 0.6s; }
        .stagger-7 { animation-delay: 0.7s; }
        .stagger-8 { animation-delay: 0.8s; }
        .stagger-9 { animation-delay: 0.9s; }
        .stagger-10 { animation-delay: 1.0s; }