.tk-container {
    text-align: center;
    font-family: sans-serif;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}
.tk-button {
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 4px;
    margin-bottom: 20px;
}
.tk-button:hover {
    opacity: 0.8;
}
.tk-button:disabled {
    background: #ccc !important;
    cursor: not-allowed;
    opacity: 1;
    color: #666 !important;
}
#tk-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    justify-content: center;
    align-items: center;
}
.tk-modal-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}
.tk-input-group {
    margin-bottom: 15px;
    text-align: left;
}
.tk-input-group input[type="text"] {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    box-sizing: border-box;
    border: 1px solid #ccc;
}
.tk-input-group label {
    font-size: 14px;
}
#tk-canvas-container {
    display: none;
}
#tk-circle-canvas {
    background: white;
    border: 1px solid #eee;
    margin: 15px auto;
    display: block;
}
.tk-chart-wrapper {
    position: relative;
    width: 100%;
}