body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1a2a6c, #2c3e50, #4a148c);
            color: #fff;
            padding: 20px;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .container {
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px;
            max-width: 800px;
        }
        
        h1 {
            font-weight: 300;
            font-size: 2.8rem;
            margin-bottom: 10px;
            background: linear-gradient(90deg, #12c2e9, #c471ed, #f64f59);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        
        p.subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.6;
        }
        
        .app-container {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            justify-content: center;
            width: 100%;
        }
        
        .visualization {
            position: relative;
            width: 600px;
            height: 600px;
            background: rgba(30, 30, 60, 0.7);
            border-radius: 50%;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5),
                        inset 0 0 50px rgba(0, 0, 0, 0.7);
            border: 1px solid rgba(255, 255, 255, 0.1);
            overflow: visible;
        }
        
        .center-cirlce {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 100px;
            height: 100px;
            background: rgba(0, 0, 0, 0.6);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #64b2f4;
            font-size: 24px;
            font-weight: bold;
            z-index: 10;
            border: 2px solid rgba(100, 178, 244, 0.3);
            box-shadow: 0 0 30px rgba(43, 127, 230, 0.4);
        }
        
        .letter {
            position: absolute;
            width: 40px;
            height: 40px;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #ecf0f1;
            font-weight: bold;
            font-size: 20px;
            transform-origin: center;
            transition: all 0.3s ease;
            background: radial-gradient(circle, #3949ab, #283593);
            border-radius: 50%;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
            z-index: 5;
        }
        
        .link {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 2;
        }
        
        line {
            stroke-width: 3;
            stroke-linecap: round;
            opacity: 0.9;
            filter: drop-shadow(0 0 3px rgba(255, 255, 255, 0.7));
        }
        
        .controls {
            background: rgba(255, 255, 255, 0.08);
            border-radius: 15px;
            padding: 30px;
            max-width: 500px;
            width: 100%;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .controls h2 {
            text-align: center;
            margin-bottom: 25px;
            font-weight: 300;
            font-size: 1.8rem;
            color: #64b2f4;
        }
        
        .tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            margin-bottom: 25px;
        }
        
        .tab-button {
            padding: 12px 24px;
            background: rgba(40, 112, 152, 0.3);
            border: 1px solid rgba(100, 178, 244, 0.3);
            border-radius: 30px;
            color: rgba(255, 255, 255, 0.9);
            font-size: 1.1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .tab-button:hover {
            background: rgba(60, 149, 197, 0.4);
            transform: translateY(-2px);
        }
        
        .tab-button.active {
            background: linear-gradient(90deg, #1a8ef1, #21acfc);
            color: white;
            box-shadow: 0 5px 15px rgba(26, 142, 241, 0.5);
            transform: translateY(-2px);
        }
        
        .slider-container {
            width: 100%;
            margin: 25px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .slider-label {
            margin-bottom: 15px;
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        input[type="range"] {
            width: 90%;
            height: 10px;
            border-radius: 5px;
            -webkit-appearance: none;
            background: rgba(255, 255, 255, 0.1);
            outline: none;
        }
        
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 25px;
            height: 25px;
            border-radius: 50%;
            background: linear-gradient(135deg, #1a75fd, #00d9ff);
            cursor: pointer;
            box-shadow: 0 0 15px rgba(0, 215, 255, 0.8);
        }
        
        .rotation-display {
            margin-top: 15px;
            font-size: 1.2rem;
            background: rgba(0, 0, 0, 0.3);
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 500;
        }
        
        .link-info {
            margin-top: 25px;
            background: rgba(0, 0, 0, 0.3);
            padding: 20px;
            border-radius: 15px;
        }
        
        .link-info h3 {
            margin-bottom: 15px;
            color: #64b2f4;
            font-weight: 400;
        }
        
        ul {
            padding-left: 25px;
        }
        
        li {
            margin-bottom: 8px;
            line-height: 1.5;
        }
        
        @media (max-width: 768px) {
            .app-container {
                flex-direction: column;
                align-items: center;
            }
            
            .visualization {
                width: 90vw;
                height: 90vw;
                max-width: 400px;
                max-height: 400px;
            }
            
            .letter {
                width: 30px;
                height: 30px;
                font-size: 16px;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            p.subtitle {
                font-size: 1rem;
            }
        }