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

        @keyframes gradientShift {
            0%, 100% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
        }

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

        @keyframes floatIcon {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
        }

        @keyframes shimmer {
            0% { background-position: -1000px 0; }
            100% { background-position: 1000px 0; }
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
            background: linear-gradient(-45deg, #0a0e27, #1a1f3a, #16213e, #0f1729);
            background-size: 400% 400%;
            animation: gradientShift 15s ease infinite;
            min-height: 100vh;
            color: #e8eaed;
            position: relative;
            overflow-x: hidden;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
            pointer-events: none;
            z-index: 0;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 3rem 2rem;
            position: relative;
            z-index: 1;
        }

        .header {
            text-align: center;
            margin-bottom: 4rem;
            animation: fadeInUp 0.8s ease-out;
        }

        .logo-container {
            display: inline-block;
            margin-bottom: 1.5rem;
            position: relative;
        }

        .logo-glow {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 120%;
            height: 120%;
            background: radial-gradient(circle, rgba(220, 53, 69, 0.3) 0%, transparent 70%);
            filter: blur(20px);
            animation: pulse 3s ease-in-out infinite;
        }

        .title {
            font-size: 5.5rem;
            font-weight: 900;
            background: linear-gradient(135deg, #ffffff 0%, #dc3545 50%, #c82333 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 1rem;
            letter-spacing: -0.03em;
            position: relative;
            text-shadow: 0 0 80px rgba(220, 53, 69, 0.5);
        }

        .subtitle {
            font-size: 1.3rem;
            color: #b8bcc8;
            font-weight: 300;
            letter-spacing: 0.5px;
        }

        .demo-card {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 24px;
            padding: 3.5rem;
            box-shadow: 
                0 20px 60px rgba(0, 0, 0, 0.4),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
            margin-bottom: 2rem;
            animation: fadeInUp 0.8s ease-out 0.2s backwards;
            position: relative;
            overflow: hidden;
        }

        .demo-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(
                90deg,
                transparent,
                rgba(255, 255, 255, 0.05),
                transparent
            );
            animation: shimmer 3s infinite;
        }

        .demo-title {
            font-size: 2.2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 2.5rem;
            text-align: center;
            position: relative;
        }

        .demo-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #dc3545, #c82333);
            margin: 1rem auto 0;
            border-radius: 2px;
        }

        .features-list {
            list-style: none;
            margin: 2.5rem 0;
        }

        .features-list li {
            padding: 1.5rem;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 1.5rem;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.3s ease;
            animation: fadeInUp 0.6s ease-out backwards;
        }

        .features-list li:nth-child(1) { animation-delay: 0.3s; }
        .features-list li:nth-child(2) { animation-delay: 0.4s; }
        .features-list li:nth-child(3) { animation-delay: 0.5s; }
        .features-list li:nth-child(4) { animation-delay: 0.6s; }

        .features-list li:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(220, 53, 69, 0.4);
            transform: translateX(8px);
            box-shadow: 0 8px 24px rgba(220, 53, 69, 0.2);
        }

        .feature-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
            color: white;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            flex-shrink: 0;
            box-shadow: 0 8px 16px rgba(220, 53, 69, 0.3);
            position: relative;
            overflow: hidden;
        }

        .feature-icon::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
            transform: translate(-50%, -50%) scale(0);
            transition: transform 0.5s ease;
        }

        .features-list li:hover .feature-icon::before {
            transform: translate(-50%, -50%) scale(2);
        }

        .features-list li:hover .feature-icon {
            animation: floatIcon 0.6s ease-in-out infinite;
        }

        .feature-text {
            font-size: 1.15rem;
            color: #e8eaed;
            line-height: 1.6;
        }

        .feature-text b {
            color: #dc3545;
            font-weight: 600;
        }

        .instruction-box {
            background: linear-gradient(135deg, rgba(220, 53, 69, 0.1) 0%, rgba(200, 35, 51, 0.05) 100%);
            border-left: 4px solid #dc3545;
            padding: 2rem;
            border-radius: 16px;
            margin: 2.5rem 0;
            position: relative;
            overflow: hidden;
            animation: fadeInUp 0.8s ease-out 0.7s backwards;
        }

        .instruction-box::before {
            content: '💡';
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            font-size: 2rem;
            opacity: 0.3;
        }

        .instruction-text {
            font-size: 1.05rem;
            color: #e8eaed;
            line-height: 1.8;
        }

        .highlight {
            color: #dc3545;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-size: 0.9rem;
        }

        .footer {
            text-align: center;
            padding: 2rem;
            color: #888c99;
            font-size: 0.95rem;
            animation: fadeInUp 0.8s ease-out 0.8s backwards;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            margin-top: 3rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .container {
                padding: 2.5rem 2rem;
            }

            .title {
                font-size: 4rem;
            }

            .demo-card {
                padding: 3rem;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 2rem 1.5rem;
            }

            .header {
                margin-bottom: 3rem;
            }

            .title {
                font-size: 3rem;
            }

            .subtitle {
                font-size: 1.15rem;
            }

            .demo-card {
                padding: 2.5rem 2rem;
            }

            .demo-title {
                font-size: 1.9rem;
                margin-bottom: 2rem;
            }

            .features-list {
                margin: 2rem 0;
            }

            .features-list li {
                padding: 1.3rem;
                gap: 1.2rem;
            }

            .feature-icon {
                width: 50px;
                height: 50px;
                font-size: 1.35rem;
            }

            .feature-text {
                font-size: 1.05rem;
            }

            .instruction-box {
                padding: 1.8rem;
                margin: 2rem 0;
            }

            .instruction-text {
                font-size: 1rem;
            }
        }

        @media (max-width: 480px) {
            body {
                background-size: 600% 600%;
            }

            .container {
                padding: 1.5rem 1rem;
            }

            .header {
                margin-bottom: 2.5rem;
            }

            .logo-container {
                margin-bottom: 1rem;
            }

            .title {
                font-size: 2.5rem;
            }

            .subtitle {
                font-size: 1rem;
            }

            .demo-card {
                padding: 2rem 1.5rem;
                border-radius: 20px;
            }

            .demo-title {
                font-size: 1.6rem;
                margin-bottom: 1.8rem;
            }

            .demo-title::after {
                width: 50px;
                height: 3px;
            }

            .features-list {
                margin: 1.5rem 0;
            }

            .features-list li {
                padding: 1.1rem;
                gap: 1rem;
                margin-bottom: 0.8rem;
            }

            .feature-icon {
                width: 44px;
                height: 44px;
                font-size: 1.2rem;
                border-radius: 14px;
            }

            .feature-text {
                font-size: 0.95rem;
                line-height: 1.5;
            }

            .instruction-box {
                padding: 1.5rem;
                margin: 1.8rem 0;
                border-radius: 14px;
            }

            .instruction-box::before {
                font-size: 1.5rem;
                top: 1rem;
                right: 1rem;
            }

            .instruction-text {
                font-size: 0.95rem;
                line-height: 1.7;
            }

            .highlight {
                font-size: 0.85rem;
            }

            .footer {
                padding: 1.5rem 1rem;
                margin-top: 2rem;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 360px) {
            .container {
                padding: 1.5rem 0.8rem;
            }

            .title {
                font-size: 2.2rem;
            }

            .subtitle {
                font-size: 0.95rem;
            }

            .demo-card {
                padding: 1.8rem 1.2rem;
            }

            .demo-title {
                font-size: 1.5rem;
            }

            .features-list li {
                padding: 1rem;
                gap: 0.9rem;
            }

            .feature-icon {
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
            }

            .feature-text {
                font-size: 0.9rem;
            }

            .instruction-box {
                padding: 1.3rem;
            }

            .instruction-text {
                font-size: 0.9rem;
            }
        }