body {
            font-family: 'SimSun', '宋体', serif;
            margin: 0;
            padding: 20px;
            background: linear-gradient(135deg, #C4CAD8 0%, #22680C 100%);
            min-height: 100vh;
            color: #E9F3FF;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            background: rgba(12, 80, 167, 0.9);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        h1 {
            text-align: center;
            font-size: 32px;
            margin-bottom: 30px;
            color: #D9EAFF;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }

        .main-content {
            display: flex;
            gap: 30px;
            margin-bottom: 30px;
        }

        .visualization-area {
            flex: 2;
            background: rgba(56, 137, 155, 0.3);
            border-radius: 10px;
            padding: 20px;
            position: relative;
        }

        .controls-area {
            flex: 1;
            background: rgba(56, 155, 116, 0.3);
            border-radius: 10px;
            padding: 20px;
        }

        .control-group {
            margin-bottom: 25px;
            padding: 15px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 8px;
        }

        .control-group h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: #D9EAFF;
        }

        .slider-container {
            margin-bottom: 15px;
        }

        .slider-label {
            display: block;
            font-size: 18px;
            margin-bottom: 8px;
            color: #E9F3FF;
        }

        .slider {
            width: 100%;
            height: 8px;
            border-radius: 4px;
            background: #2D73CC;
            outline: none;
            -webkit-appearance: none;
        }

        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #38899B;
            cursor: pointer;
        }

        .value-display {
            font-size: 18px;
            font-weight: bold;
            color: #D9EAFF;
            margin-top: 8px;
        }

        .function-values {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 20px;
        }

        .function-value {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
            font-size: 18px;
        }

        .sin-value {
            color: #389B74;
        }

        .cos-value {
            color: #38899B;
        }

        .special-angles {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .angle-btn {
            background: #2D73CC;
            color: #E9F3FF;
            border: none;
            padding: 8px 15px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .angle-btn:hover {
            background: #38899B;
            transform: translateY(-2px);
        }

        .formula-display {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            text-align: center;
        }

        .canvas-container {
            position: relative;
            width: 100%;
            height: 500px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 8px;
            overflow: hidden;
        }

        #mainCanvas {
            border-radius: 8px;
        }

        .measurement-display {
            position: absolute;
            top: 10px;
            right: 10px;
            background: rgba(0, 0, 0, 0.7);
            color: #E9F3FF;
            padding: 10px;
            border-radius: 5px;
            font-size: 16px;
            line-height: 1.4;
        }

        .animation-controls {
            display: flex;
            gap: 10px;
            justify-content: center;
            margin-top: 20px;
        }

        .control-btn {
            background: #2D73CC;
            color: #E9F3FF;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 18px;
            transition: all 0.3s ease;
        }

        .control-btn:hover {
            background: #38899B;
        }

        .control-btn:active {
            transform: scale(0.95);
        }

        .footer {
            background: linear-gradient(to right);
            color: #ecf0f1;
            text-align: center;
            padding: 10px;
            margin-top: 15px;
            border-radius: 0 0 10px 10px;
        }

        @media (max-width: 1200px) {
            .main-content {
                flex-direction: column;
            }
            
            .controls-area {
                order: -1;
            }
        }