body {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 100%);
            color: #1f2937;
            overflow-x: hidden;
        }

        .presentation-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .slide {
            background: white;
            border-radius: 20px;
            padding: 60px 40px;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            border: 1px solid #e5e7eb;
            position: relative;
            overflow: hidden;
        }

        .slide::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #10b981, #3b82f6);
        }

        .title-slide {
            text-align: center;
            background: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
            color: white;
            min-height: 500px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .title-slide::before {
            display: none;
        }

        .main-title {
            font-size: 4rem;
            font-weight: 800;
            margin-bottom: 20px;
            text-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }

        .subtitle {
            font-size: 1.5rem;
            opacity: 0.9;
            margin-bottom: 40px;
        }

        .tagline {
            font-size: 1.2rem;
            background: rgba(255, 255, 255, 0.2);
            padding: 15px 30px;
            border-radius: 50px;
            backdrop-filter: blur(10px);
        }

        .slide-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: #10b981;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .slide-subtitle {
            font-size: 1.2rem;
            color: #6b7280;
            margin-bottom: 40px;
        }

        .icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, #10b981, #3b82f6);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 24px;
        }

        .content-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .card {
            background: #f8fafc;
            padding: 30px;
            border-radius: 16px;
            border: 1px solid #e2e8f0;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }

        .card-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #10b981, #3b82f6);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 28px;
            margin-bottom: 20px;
        }

        .card-title {
            font-size: 1.3rem;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 10px;
        }

        .card-subtitle {
            font-size: 1rem;
            color: #10b981;
            margin-bottom: 15px;
            font-weight: 500;
        }

        .card-text {
            color: #6b7280;
            line-height: 1.6;
        }

        .tech-stack {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 30px;
        }

        .tech-item {
            background: linear-gradient(135deg, #10b981, #3b82f6);
            color: white;
            padding: 12px 24px;
            border-radius: 25px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .journey-steps {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 40px;
        }

        .step {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px;
            background: #f8fafc;
            border-radius: 12px;
            border-left: 4px solid #10b981;
        }

        .step-number {
            width: 40px;
            height: 40px;
            background: #10b981;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            flex-shrink: 0;
        }

        .architecture-diagram {
            background: #f8fafc;
            padding: 40px;
            border-radius: 16px;
            margin-top: 30px;
            text-align: center;
        }

        .arch-flow {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .arch-box {
            background: white;
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            min-width: 120px;
            text-align: center;
        }

        .arch-arrow {
            font-size: 24px;
            color: #10b981;
        }

        .ui-mockups {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .mockup {
            background: #1f2937;
            border-radius: 20px;
            padding: 20px;
            color: white;
            text-align: center;
            min-height: 250px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .mockup::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 30px;
            background: #374151;
            border-radius: 20px 20px 0 0;
        }

        .security-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .security-item {
            background: linear-gradient(135deg, #fef3c7, #fde68a);
            padding: 25px;
            border-radius: 12px;
            text-align: center;
        }

        .final-message {
            text-align: center;
            background: linear-gradient(135deg, #fee2e2, #fecaca);
            padding: 40px;
            border-radius: 16px;
            margin-top: 40px;
        }

        .final-message h3 {
            color: #dc2626;
            font-size: 1.5rem;
            margin-bottom: 15px;
        }

        .navigation {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            gap: 10px;
            z-index: 1000;
        }

        .nav-btn {
            width: 50px;
            height: 50px;
            background: #10b981;
            color: white;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            font-size: 20px;
            transition: all 0.3s ease;
        }

        .nav-btn:hover {
            background: #059669;
            transform: scale(1.1);
        }

        @media (max-width: 768px) {
            .main-title {
                font-size: 2.5rem;
            }
            
            .slide {
                padding: 40px 20px;
            }
            
            .arch-flow {
                flex-direction: column;
            }
            
            .arch-arrow {
                transform: rotate(90deg);
            }
        }