.sl-ttf-builder-container {
    max-width: 800px;
    margin: 20px auto;
    font-family: sans-serif;
    color: #333;
}

.sl-panel {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.sl-panel h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.2em;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.sl-dropzone {
    border: 2px dashed #007cba;
    background: #f9f9f9;
    border-radius: 6px;
    text-align: center;
    padding: 40px 20px;
    cursor: pointer;
    transition: background 0.2s;
}

.sl-dropzone:hover, .sl-dropzone.dragover {
    background: #e6f7ff;
}

.sl-dropzone p {
    margin: 0;
    color: #007cba;
    font-weight: bold;
}

.sl-info {
    margin-top: 10px;
    font-size: 0.9em;
    color: #555;
}

.sl-control-group {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.sl-control-group label {
    flex: 1;
    font-weight: 600;
}

.sl-control-group input[type="range"] {
    flex: 2;
    margin: 0 15px;
}

.sl-control-group span {
    width: 40px;
    text-align: right;
    font-weight: bold;
    color: #007cba;
}

.sl-btn {
    background: #007cba;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.sl-btn:hover {
    background: #006ba1;
}

.sl-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.sl-btn-success {
    background: #46b450;
}

.sl-btn-success:hover {
    background: #39963f;
}

.sl-progress-wrapper {
    margin-top: 15px;
    background: #eee;
    border-radius: 4px;
    position: relative;
    height: 25px;
    overflow: hidden;
}

.sl-progress-bar {
    background: #007cba;
    height: 100%;
    width: 0%;
    transition: width 0.1s linear;
}

.sl-progress-text {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    text-align: center;
    line-height: 25px;
    color: #fff;
    font-size: 0.9em;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.sl-sandbox {
    width: 100%;
    min-height: 150px;
    height: auto;
    padding: 10px;
    font-size: 36px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    margin-bottom: 15px;
}