/* ===== CSS VARIABLES (Hier Farben ändern) ===== */
        :root {
            --color-primary: #00FF00;
            --color-accent: #00FFFF;
            --color-bg: #0A0A0A;
            --color-surface: #1A1A1A;
            --color-text: #00FF00;
            --color-heading: #00FFFF;
            --color-muted: #666666;
            --color-border: #00FF00;
            
            --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'Courier New', monospace;
            
            --transition: all 0.15s linear;
        }
        
        [data-theme="light"] {
            --color-primary: #000000;
            --color-accent: #0066CC;
            --color-bg: #FFFFFF;
            --color-surface: #F5F5F5;
            --color-text: #000000;
            --color-heading: #0066CC;
            --color-muted: #999999;
            --color-border: #000000;
        }

        /* ===== BACKGROUND PATTERN ===== */
        .binary-background {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            pointer-events: none;
            font-family: var(--font-mono);
            font-size: 12px;
            line-height: 1.4;
            overflow: hidden;
            opacity: 0.4;
            color: var(--color-border);
        }

        [data-theme="light"] .binary-background {
            opacity: 0.02;
        }




        
        /* ===== RESET & BASE ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: var(--font-mono);
            color: var(--color-text);
            background: var(--color-bg);
            line-height: 1.6;
            font-size: 14px;
            transition: var(--transition);
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-mono);
            color: var(--color-heading);
            line-height: 1.2;
            font-weight: 700;
        }
        
        h1 { font-size: 2rem; }
        h2 { font-size: 1.5rem; margin-bottom: 1rem; }
        h3 { font-size: 1.125rem; font-weight: 600; }
        
        a {
            color: var(--color-accent);
            text-decoration: underline;
            transition: var(--transition);
        }
        
        a:hover {
            background: var(--color-accent);
            color: var(--color-bg);
        }
        
        section {
            padding: 3rem 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        /* ===== SECTION HEADERS ===== */
        .section-header {
            border-bottom: 2px solid var(--color-border);
            padding-bottom: 0.5rem;
            margin-bottom: 2rem;
            position: relative;
        }
        
        .section-header::before {
            content: '─────────────────────────────────────────────────────────────────────';
            display: block;
            color: var(--color-border);
            margin-bottom: 0.5rem;
            overflow: hidden;
        }
        
        .section-header h2::before {
            content: '## ';
            color: var(--color-accent);
        }
        
        
        /* ===== BLOG/NOTES SECTION ===== */
        .blog-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }
        
        .blog-card {
            background: var(--color-surface);
            padding: 1.5rem;
            border: 1px solid var(--color-border);
            transition: var(--transition);
            position: relative;
        }
        
        .blog-card::before {
            content: '+';
            position: absolute;
            top: -1px;
            left: -1px;
            color: var(--color-border);
            background: var(--color-bg);
        }
        
        .blog-card::after {
            content: '+';
            position: absolute;
            top: -1px;
            right: -1px;
            color: var(--color-border);
            background: var(--color-bg);
        }
        
        .blog-card:hover {
            border-color: var(--color-accent);
        }
        
        .blog-card h3 {
            margin-bottom: 0.75rem;
            font-size: 1rem;
        }
        
        .blog-card h3::before {
            content: '# ';
            color: var(--color-accent);
        }
        
        .blog-card p {
            color: var(--color-muted);
            font-size: 0.85rem;
        }
        
        /* ===== CONTACT SECTION ===== */
        #contact {
            text-align: center;
        }
        
        #contact p {
            font-size: 1rem;
            max-width: 700px;
            margin: 0 auto 2rem;
        }
        
        .social-links {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            margin-top: 2rem;
            flex-wrap: wrap;
        }
        
        .social-links a {
            color: var(--color-text);
            transition: var(--transition);
            text-decoration: none;
            border: 1px solid var(--color-border);
            padding: 0.5rem 1rem;
        }
        
        .social-links a::before {
            content: '> ';
            color: var(--color-accent);
        }
        
        .social-links a:hover {
            background: var(--color-accent);
            color: var(--color-bg);
            border-color: var(--color-accent);
        }
        
        /* ===== FOOTER ===== */
        footer {
            text-align: center;
            padding: 2rem;
            color: var(--color-muted);
            font-size: 0.8rem;
            border-top: 1px solid var(--color-border);
            margin-top: 4rem;
        }
        
        footer::before {
            content: '─────────────────────────────────────────────────────────────────────';
            display: block;
            color: var(--color-border);
            margin-bottom: 1rem;
        }
        
        footer p::before {
            content: '// ';
            color: var(--color-accent);
        }
        footer .design-credit {
            font-size: 0.75rem;
            color: var(--color-muted);
            margin-top: 0.5rem;
            opacity: 0.7;
        }

        footer .design-credit::before {
            content: '// ';
            color: var(--color-accent);
        }
        
        /* ===== CURSOR BLINK ===== */
        .cursor {
            display: inline-block;
            width: 0.6rem;
            height: 1rem;
            background: var(--color-accent);
            animation: blink 1s infinite;
            margin-left: 0.2rem;
        }
        
        @keyframes blink {
            0%, 49% { opacity: 1; }
            50%, 100% { opacity: 0; }
        }
        
        /* ===== RESPONSIVE ===== */
        @media (max-width: 768px) {
            h1 { font-size: 1.5rem; }
            h2 { font-size: 1.25rem; }
            
            nav ul {
                gap: 1rem;
                flex-wrap: wrap;
            }
            
            section {
                padding: 2rem 1rem;
            }
            
            .ascii-art {
                font-size: 0.4rem;
            }
            
            nav::before,
            nav::after {
                font-size: 0.6rem;
            }
        }

        .scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-surface);
    z-index: 9999;
}

.scroll-progress-bar {
    height: 100%;
    background: var(--color-accent);
    width: 0%;
    transition: width 0.1s linear;
}
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-accent);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

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

.back-to-top:hover {
    background: var(--color-accent);
    color: var(--color-bg);
}

.back-to-top span::before {
    content: '$ ';
}