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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #000;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0;
            overflow: hidden;
            position: relative;
        }

        .container {
            width: 100%;
            height: 100vh;
            position: relative;
            border: 4px solid transparent;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .container.processing {
            border-color: #ef4444;
            box-shadow: 0 0 30px rgba(239, 68, 68, 0.6);
            animation: processingPulse 1.5s infinite;
        }

        .container.success {
            border-color: #10b981;
            box-shadow: 0 0 30px rgba(16, 185, 129, 0.6);
            animation: successPulse 0.5s ease-out;
        }

        @keyframes processingPulse {
            0%, 100% { 
                box-shadow: 0 0 30px rgba(239, 68, 68, 0.6);
            }
            50% { 
                box-shadow: 0 0 50px rgba(239, 68, 68, 0.9);
            }
        }

        @keyframes successPulse {
            0% { 
                box-shadow: 0 0 30px rgba(16, 185, 129, 0.6);
            }
            50% { 
                box-shadow: 0 0 60px rgba(16, 185, 129, 1);
            }
            100% { 
                box-shadow: 0 0 30px rgba(16, 185, 129, 0.6);
            }
        }

        #video, #canvas {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .camera-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            pointer-events: none;
            background: radial-gradient(circle at center, transparent 40%, rgba(0, 0, 0, 0.1) 70%);
        }

        .instruction {
            position: absolute;
            top: 60%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 1.5rem;
            font-weight: 500;
            color: white;
            text-shadow: 0 0 8px rgba(0, 0, 0, 0.7);
            text-align: center;
            padding: 0 20px;
            z-index: 10;
        }

        .message {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 24px 32px;
            border-radius: 16px;
            color: #1f2937;
            font-size: 1.1rem;
            font-weight: 600;
            z-index: 1000;
            display: none;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
            text-align: center;
            opacity: 1;
            transition: opacity 0.5s ease;
            border: 2px solid rgba(255, 255, 255, 0.3);
            min-width: 280px;
            max-width: 90vw;
        }

        .message.error {
            background: rgba(239, 68, 68, 0.95);
            color: white;
            box-shadow: 0 20px 40px rgba(239, 68, 68, 0.3);
        }

        .message.info {
            background: rgba(59, 130, 246, 0.95);
            color: white;
            box-shadow: 0 20px 40px rgba(59, 130, 246, 0.3);
        }

        .message.success {
            background: rgba(16, 185, 129, 0.95);
            color: white;
            box-shadow: 0 20px 40px rgba(16, 185, 129, 0.3);
        }

        .message > div {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .message .text-xl {
            font-size: 1.5rem;
        }

        #alert-container {
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: calc(100vw - 40px);
        }

        .alert-box {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px);
            border-radius: 16px;
            padding: 16px 20px;
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            gap: 16px;
            opacity: 0;
            transform: translateX(100%);
            transition: all 0.4s ease;
            min-width: 260px;
            max-width: 100%;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }

        .alert-box.show {
            opacity: 1;
            transform: translateX(0);
        }

        .entry-alert {
            border-left: 4px solid #10b981;
        }

        .exit-alert {
            border-left: 4px solid #ef4444;
        }

        .alert-icon {
            font-size: 1.3rem;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .entry-alert .alert-icon {
            background: linear-gradient(135deg, #10b981, #059669);
            color: white;
        }

        .exit-alert .alert-icon {
            background: linear-gradient(135deg, #ef4444, #dc2626);
            color: white;
        }

        .alert-content {
            flex: 1;
            min-width: 0;
        }

        .alert-name {
            font-size: 1rem;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 4px;
            word-wrap: break-word;
        }

        .alert-action {
            font-size: 0.85rem;
            color: #6b7280;
            margin-bottom: 2px;
        }

        .alert-time {
            font-size: 0.75rem;
            color: #9ca3af;
        }

        .status-indicator {
            position: absolute;
            top: 20px;
            left: 20px;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 500;
            backdrop-filter: blur(10px);
            z-index: 100;
        }

        .pulse-animation {
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }

        /* Tablet Styles */
        @media (max-width: 1024px) and (min-width: 769px) {
            .container {
                border-width: 3px;
            }
            
            .instruction {
                font-size: 1.3rem;
            }
            
            .message {
                padding: 20px 28px;
                font-size: 1rem;
            }
            
            .alert-box {
                min-width: 240px;
                padding: 14px 18px;
            }
            
            .alert-name {
                font-size: 0.95rem;
            }
        }

        /* Mobile Styles */
        @media (max-width: 768px) {
            body {
                padding: 0;
            }
            
            .container {
                border-width: 2px;
                height: 100vh;
                width: 100vw;
            }

            .instruction {
                font-size: 1.1rem;
                top: 65%;
                padding: 0 30px;
                line-height: 1.4;
            }

            .message {
                padding: 18px 24px;
                font-size: 0.95rem;
                min-width: 260px;
                max-width: 85vw;
                border-radius: 12px;
            }

            .message > div {
                gap: 10px;
            }

            .message .text-xl {
                font-size: 1.3rem;
            }

            #alert-container {
                top: 15px;
                right: 15px;
                left: 15px;
                max-width: none;
            }

            .alert-box {
                min-width: auto;
                width: 100%;
                padding: 12px 16px;
                border-radius: 12px;
                gap: 12px;
            }

            .alert-icon {
                width: 32px;
                height: 32px;
                font-size: 1.1rem;
            }

            .alert-name {
                font-size: 0.9rem;
            }

            .alert-action {
                font-size: 0.8rem;
            }

            .alert-time {
                font-size: 0.7rem;
            }

            .status-indicator {
                top: 15px;
                left: 15px;
                padding: 6px 12px;
                font-size: 0.8rem;
                border-radius: 16px;
            }
        }

        /* Small Mobile Styles */
        @media (max-width: 480px) {
            .instruction {
                font-size: 1rem;
                top: 70%;
                padding: 0 25px;
            }

            .message {
                padding: 16px 20px;
                font-size: 0.9rem;
                min-width: 240px;
                max-width: 90vw;
            }

            .message .text-xl {
                font-size: 1.2rem;
            }

            #alert-container {
                top: 10px;
                right: 10px;
                left: 10px;
            }

            .alert-box {
                padding: 10px 14px;
                gap: 10px;
            }

            .alert-icon {
                width: 28px;
                height: 28px;
                font-size: 1rem;
            }

            .alert-name {
                font-size: 0.85rem;
            }

            .status-indicator {
                top: 10px;
                left: 10px;
                padding: 5px 10px;
                font-size: 0.75rem;
            }
        }

        /* Landscape Mobile Styles */
        @media (max-width: 768px) and (orientation: landscape) {
            .instruction {
                top: 55%;
                font-size: 1rem;
            }

            #alert-container {
                top: 10px;
                right: 10px;
                left: auto;
                max-width: 300px;
            }

            .status-indicator {
                top: 10px;
                left: 10px;
            }
        }

        /* High DPI Displays */
        @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
            .message {
                backdrop-filter: blur(15px);
            }
            
            .alert-box {
                backdrop-filter: blur(25px);
            }
        }