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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f9fafb;
        }

        /* Header Styles */
        header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(0, 0, 0, 0.95);
            backdrop-filter: blur(12px);
            height: 3cm;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        .container-xl {
            max-width: 1280px;
            margin: 0 auto;
            padding: 20px 1rem;
            height: auto;
        }

        nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0;
        }

        /* Logo Section */
        .logo-link {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
            transition: transform 0.3s;
        }

        .logo-link:hover {
            transform: scale(1.02);
        }

        .logo-img {
            height: 3rem;
            width: auto;
            transition: transform 0.3s;
        }

        .logo-link:hover .logo-img {
            transform: scale(1.05);
        }

        .logo-text {
            display: none;
        }

        @media (min-width: 640px) {
            .logo-text {
                display: block;
            }
        }

        .logo-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: white;
            display: block;
        }

        .logo-subtitle {
            font-size: 0.75rem;
            color: #fbbf24;
        }

        /* Desktop Navigation */
        .desktop-nav {
            display: none;
            align-items: center;
            gap: 2rem;
            list-style: none;
        }

        @media (min-width: 768px) {
            .desktop-nav {
                display: flex;
            }
        }

        .nav-link {
            font-weight: 500;
            padding: 0.5rem 0.75rem;
            border-radius: 0.5rem;
            position: relative;
            text-decoration: none;
            color: white;
            transition: all 0.3s;
        }

        .nav-link:hover {
            color: #fbbf24;
            background: rgba(255, 255, 255, 0.1);
        }

        .nav-link.active {
            color: #fbbf24;
            background: rgba(251, 191, 36, 0.1);
        }

        .nav-link-bg {
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, rgba(249, 115, 22, 0.2), rgba(251, 191, 36, 0.2));
            border-radius: 0.5rem;
            opacity: 0;
            transition: opacity 0.3s;
        }

        .nav-link:not(.active):hover .nav-link-bg {
            opacity: 1;
        }

        .nav-link span {
            position: relative;
            z-index: 10;
        }

        /* Mobile Menu Button */
        .mobile-menu-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 0.75rem;
            padding: 0.75rem;
            color: white;
            background: transparent;
            border: none;
            cursor: pointer;
            position: relative;
            overflow: hidden;
            transition: all 0.3s;
        }

        .mobile-menu-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        @media (min-width: 768px) {
            .mobile-menu-btn {
                display: none;
            }
        }

        .mobile-menu-btn-bg {
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, rgba(249, 115, 22, 0.2), rgba(251, 191, 36, 0.2));
            opacity: 0;
            transition: opacity 0.3s;
            border-radius: 0.75rem;
        }

        .mobile-menu-btn:hover .mobile-menu-btn-bg {
            opacity: 1;
        }

        .mobile-menu-btn svg {
            width: 1.5rem;
            height: 1.5rem;
            position: relative;
            z-index: 10;
            transition: transform 0.3s;
        }

        .mobile-menu-btn:hover svg {
            transform: scale(1.1);
        }

        /* Gradient Line */
        .gradient-line {
            margin: 20px 0px;
            height: 4px;
            width: 100%;
            background: linear-gradient(to right, #f97316, #fbbf24, #f97316);
        }

        /* Backdrop */
        .backdrop {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(4px);
            z-index: 50;
            animation: fadeIn 0.3s;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @media (min-width: 768px) {
            .backdrop {
                display: none;
            }
        }

        /* Mobile Modal */
        .mobile-modal {
            position: fixed;
            left: 0;
            top: 0;
            height: 100%;
            width: 20rem;
            max-width: 85vw;
            background: rgba(0, 0, 0, 0.95);
            backdrop-filter: blur(24px);
            border-right: 1px solid rgba(255, 255, 255, 0.2);
            z-index: 50;
            animation: slideIn 0.3s ease-in-out;
            overflow-y: auto;
        }

        @keyframes slideIn {
            from { transform: translateX(-100%); }
            to { transform: translateX(0); }
        }

        @media (min-width: 768px) {
            .mobile-modal {
                display: none;
            }
        }

        /* Modal Header */
        .modal-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .modal-logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .modal-logo img {
            height: 2rem;
            width: auto;
        }

        .modal-logo span {
            font-size: 1.125rem;
            font-weight: 700;
            color: white;
        }

        .close-btn {
            padding: 0.5rem;
            color: white;
            background: transparent;
            border: none;
            border-radius: 0.75rem;
            cursor: pointer;
            position: relative;
            overflow: hidden;
            transition: all 0.3s;
        }

        .close-btn:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        .close-btn-bg {
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, rgba(249, 115, 22, 0.2), rgba(251, 191, 36, 0.2));
            opacity: 0;
            transition: opacity 0.3s;
            border-radius: 0.75rem;
        }

        .close-btn:hover .close-btn-bg {
            opacity: 1;
        }

        .close-btn svg {
            width: 1.5rem;
            height: 1.5rem;
            position: relative;
            z-index: 10;
            transition: transform 0.3s;
        }

        .close-btn:hover svg {
            transform: scale(1.1);
        }

        /* Modal Navigation */
        .modal-nav {
            padding: 1.5rem;
            height: auto;
        }

        .modal-nav-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .modal-nav-link {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 0.75rem 1rem;
            border-radius: 0.75rem;
            font-weight: 500;
            text-decoration: none;
            color: white;
            position: relative;
            overflow: hidden;
            transition: all 0.3s;
        }

        .modal-nav-link:hover {
            color: #fbbf24;
            background: rgba(255, 255, 255, 0.1);
        }

        .modal-nav-link.active {
            color: #fbbf24;
            background: rgba(251, 191, 36, 0.1);
            border-left: 4px solid #fbbf24;
        }

        .modal-nav-link-bg {
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, rgba(249, 115, 22, 0.1), rgba(251, 191, 36, 0.1));
            opacity: 0;
            transition: opacity 0.3s;
        }

        .modal-nav-link:not(.active):hover .modal-nav-link-bg {
            opacity: 1;
        }

        .modal-nav-link span {
            position: relative;
            z-index: 10;
        }

        /* Support Button */
        .support-section {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .support-btn {
            position: relative;
            overflow: hidden;
            background: linear-gradient(to right, #f97316, #fbbf24, #f97316);
            color: black;
            font-weight: 700;
            padding: 1.25rem 2rem;
            border-radius: 1rem;
            width: 100%;
            text-align: center;
            display: block;
            text-decoration: none;
            border: 2px solid transparent;
            transition: all 0.5s;
        }

        .support-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 20px 25px -5px rgba(251, 191, 36, 0.4);
            border-color: rgba(251, 191, 36, 0.3);
        }

        .support-btn-bg {
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, #fbbf24, #f97316);
            opacity: 0;
            transition: opacity 0.5s;
        }

        .support-btn:hover .support-btn-bg {
            opacity: 1;
        }

        .support-btn-decorator1,
        .support-btn-decorator2 {
            position: absolute;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            transition: transform 0.5s;
        }

        .support-btn-decorator1 {
            width: 2rem;
            height: 2rem;
            top: -0.5rem;
            right: -0.5rem;
        }

        .support-btn-decorator2 {
            width: 1.5rem;
            height: 1.5rem;
            bottom: -0.5rem;
            left: -0.5rem;
            transition-delay: 0.1s;
        }

        .support-btn:hover .support-btn-decorator1,
        .support-btn:hover .support-btn-decorator2 {
            transform: scale(1.5);
        }

        .support-btn-content {
            position: relative;
            z-index: 10;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.75rem;
            font-size: 1.125rem;
        }

        .support-btn-icon {
            font-size: 1.5rem;
            transition: transform 0.3s;
        }

        .support-btn:hover .support-btn-icon {
            transform: rotate(12deg);
        }

        .support-btn-text {
            transition: letter-spacing 0.3s;
        }

        .support-btn:hover .support-btn-text {
            letter-spacing: 0.05em;
        }

        .support-btn-arrow {
            font-size: 1.25rem;
            transition: transform 0.3s;
        }

        .support-btn:hover .support-btn-arrow {
            transform: translateX(0.25rem);
        }

        .support-btn-shine {
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
            transform: translateX(-100%);
            transition: transform 0.7s;
        }

        .support-btn:hover .support-btn-shine {
            transform: translateX(100%);
        }

        /* Modal Footer */
        .modal-footer {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .modal-footer p {
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.6);
            text-align: center;
        }

        /* Hidden class */
        .hidden {
            display: none;
        }

        /* Demo Content */
        .content {
            margin-top: 100px;
            padding: 2rem;
            text-align: center;
        }

        .content h1 {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: #1a202c;
        }

        .content p {
            color: #718096;
            line-height: 1.6;
        }