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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            min-height: 100vh;
            color: white;
            overflow: hidden;
        }

        .video-container {
            position: relative;
            width: 100vw;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .main-video {
            width: 100%;
            height: 100%;
            object-fit: cover;
            background: #000;
            border-radius: 0;
        }

        .ai-avatar {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4);
            background-size: 400% 400%;
            animation: gradientShift 4s ease-in-out infinite;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4rem;
            box-shadow: 0 0 50px rgba(255, 255, 255, 0.3);
            transition: all 0.3s ease;
        }

        .ai-avatar.speaking {
            transform: translate(-50%, -50%) scale(1.1);
            box-shadow: 0 0 80px rgba(255, 255, 255, 0.6);
            animation: gradientShift 2s ease-in-out infinite, pulse 1s ease-in-out infinite;
        }

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

        @keyframes pulse {
            0%, 100% { transform: translate(-50%, -50%) scale(1.1); }
            50% { transform: translate(-50%, -50%) scale(1.2); }
        }

        .controls {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 20px;
            background: rgba(0, 0, 0, 0.7);
            padding: 20px;
            border-radius: 25px;
            backdrop-filter: blur(10px);
        }

        .control-btn {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            border: none;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .control-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: scale(1.1);
        }

        .control-btn.active {
            background: #ff4757;
        }

        .control-btn.recording {
            background: #ff4757;
            animation: recordPulse 1s ease-in-out infinite;
        }

        @keyframes recordPulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }

        .status-indicator {
            position: absolute;
            top: 30px;
            left: 30px;
            background: rgba(0, 0, 0, 0.7);
            padding: 15px 25px;
            border-radius: 25px;
            backdrop-filter: blur(10px);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .status-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #2ed573;
            animation: statusPulse 2s ease-in-out infinite;
        }

        @keyframes statusPulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.5; }
        }

        .conversation-log {
            position: absolute;
            top: 30px;
            right: 30px;
            width: 300px;
            max-height: 60vh;
            background: rgba(0, 0, 0, 0.8);
            border-radius: 15px;
            padding: 20px;
            backdrop-filter: blur(10px);
            overflow-y: auto;
        }

        .message {
            margin-bottom: 15px;
            padding: 10px 15px;
            border-radius: 15px;
            max-width: 80%;
        }

        .message.user {
            background: #4A90E2;
            margin-left: auto;
            text-align: right;
        }

        .message.ai {
            background: #7B68EE;
        }

        .user-video {
            position: absolute;
            bottom: 120px;
            right: 30px;
            width: 200px;
            height: 150px;
            border-radius: 15px;
            object-fit: cover;
            border: 3px solid rgba(255, 255, 255, 0.3);
            background: #000;
        }

        .loading {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            display: none;
        }

        .loading.show {
            display: block;
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-top: 3px solid white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .welcome-screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 1000;
        }

        .welcome-content {
            text-align: center;
            max-width: 600px;
            padding: 0 20px;
        }

        .welcome-content h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .welcome-content p {
            font-size: 1.2rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .start-btn {
            padding: 15px 40px;
            font-size: 1.2rem;
            background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
            border: none;
            border-radius: 50px;
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .start-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }