.site-header {
            background: rgba(18, 18, 18, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 32px rgba(0, 0, 0, 0.3);
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem 1.5rem;
            position: relative;
        }

        .logo-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
            z-index: 1001;
        }

        .logo-link:hover {
            transform: translateY(-1px);
        }

        .logo-link img {
            width: 50px;
            height: 45px;
            margin-right: 1rem;
            border-radius: 10px;
            transition: all 0.3s ease;
        }

        .logo-link:hover img {
            transform: rotate(5deg);
        }

        .logo-text {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
        }

        .site-title {
            font-weight: 700;
            font-size: 1.6rem;
            margin: 0;
        }

        .tagline {
            font-weight: 300;
            font-size: 0.9rem;
            color: #aaa;
            margin: 0;
            opacity: 0.8;
        }

        /* Hamburger Menu */
        .hamburger {
            background: none;
            border: none;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            justify-content: center;
            width: 32px;
            height: 32px;
            padding: 0;
            border-radius: 6px;
            transition: all 0.3s ease;
            z-index: 1001;
            position: relative;
        }

        .hamburger:hover {
            background: rgba(0, 188, 212, 0.1);
            transform: scale(1.05);
        }

        .hamburger-bar {
            width: 24px;
            height: 2px;
            background: #eee;
            margin: 3px auto;
            border-radius: 2px;
            transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
            transform-origin: center;
        }

        .hamburger.active .hamburger-bar:nth-child(1) {
            transform: rotate(45deg) translate(6px, 6px);
            background: #00bcd4;
        }

        .hamburger.active .hamburger-bar:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }

        .hamburger.active .hamburger-bar:nth-child(3) {
            transform: rotate(-45deg) translate(6px, -6px);
            background: #00bcd4;
        }

        /* Dropdown Menu */
        .dropdown-menu {
            position: absolute;
            top: 100%;
            right: 1.5rem;
            background: rgba(26, 26, 26, 0.98);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 16px;
            min-width: 220px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-20px) scale(0.95);
            transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            overflow: hidden;
        }

        .dropdown-menu.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0) scale(1);
        }

        .dropdown-menu::before {
            content: '';
            position: absolute;
            top: -8px;
            right: 20px;
            width: 16px;
            height: 16px;
            background: rgba(26, 26, 26, 0.98);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-bottom: none;
            border-right: none;
            transform: rotate(45deg);
            border-radius: 2px 0 0 0;
        }

        .nav-links {
            padding: 1rem 0;
        }

        .nav-links a {
            display: flex;
            align-items: center;
            padding: 0.875rem 1.5rem;
            color: #eee;
            text-decoration: none;
            font-weight: 500;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            position: relative;
            border-left: 3px solid transparent;
        }

        .nav-links a::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 0;
            height: 100%;
            background: linear-gradient(90deg, rgba(0, 188, 212, 0.1), transparent);
            transition: width 0.3s ease;
        }

        .nav-links a:hover::before,
        .nav-links a:focus-visible::before {
            width: 100%;
        }

        .nav-links a:hover,
        .nav-links a:focus-visible {
            color: #00bcd4;
            border-left-color: #00bcd4;
            outline: none;
            transform: translateX(5px);
        }

        .nav-links a[aria-current="page"] {
            color: #00bcd4;
            border-left-color: #00bcd4;
            background: rgba(0, 188, 212, 0.08);
        }

        .nav-links a[aria-current="page"]::before {
            width: 100%;
        }

        /* Menu icons */
        .nav-links a::after {
            content: '→';
            margin-left: auto;
            opacity: 0;
            transform: translateX(-10px);
            transition: all 0.3s ease;
            color: #00bcd4;
            font-weight: bold;
        }

        .nav-links a:hover::after,
        .nav-links a:focus-visible::after {
            opacity: 1;
            transform: translateX(0);
        }

        /* Demo content */
        .demo-content {
            padding: 3rem 1.5rem;
            max-width: 1200px;
            margin: 0 auto;
        }

        .demo-content h2 {
            color: #00bcd4;
            margin-bottom: 1.5rem;
            font-size: 2rem;
        }

        .demo-content p {
            line-height: 1.7;
            color: #bbb;
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }

        .feature-card {
            background: rgba(26, 26, 26, 0.8);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            padding: 1.5rem;
            transition: all 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            border-color: rgba(0, 188, 212, 0.3);
        }

        .feature-card h3 {
            color: #00bcd4;
            margin-bottom: 1rem;
        }

        /* Responsive adjustments */
        @media (max-width: 640px) {
            .logo-text {
                text-align: center;
            }
            .header-content {
                padding: 0.875rem 1rem;
            }

            .site-title {
                text-align: center;
                font-size: 1.4rem;
            }

            .tagline {
                font-size: 0.65rem;
            }

            .dropdown-menu {
                right: 1rem;
                left: 1rem;
                min-width: auto;
            }

            .dropdown-menu::before {
                right: 16px;
            }
        }

        @media (max-width: 480px) {
            .logo-link img {
                width: 45px;
                height: 40px;
                margin-right: 0.75rem;
            }

            .site-title {
                font-size: 1.3rem;
            }
        }

        /* Focus styles for accessibility */
        .logo-link:focus-visible,
        .hamburger:focus-visible {
            outline: 2px solid #00bcd4;
            outline-offset: 2px;
            border-radius: 8px;
        }

        /* Smooth scrolling */
        html {
            scroll-behavior: smooth;
        }

        /* Overlay when menu is open */
        .menu-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(5px);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
        }

        .menu-overlay.show {
            opacity: 1;
            visibility: visible;
        }