body {
    background: #2b2b2b;
    color: #e0e0e0;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    padding: 20px;
}

.container { max-width: 1000px; width: 100%; text-align: center; }
.logo { max-width: 150px; margin-bottom: 20px; }

.main-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 20px;
}

.panel {
    background: #383838;
    padding: 25px;
    border-radius: 12px;
    border: 1px solid #4a4a4a;
}

#color-preview {
    width: 100%;
    height: 150px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 5px solid #1a1a1a;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.controls label {
    display: block; text-align: left; margin-top: 15px;
    font-weight: bold; color: #bbb;
}

input[type="range"] { width: 100%; margin: 10px 0; cursor: pointer; }

.presets { margin-top: 25px; padding-top: 20px; border-top: 1px solid #4a4a4a; }
.preset-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.preset-grid button {
    padding: 10px; border-radius: 4px; border: none; background: #4a4a4a;
    color: white; cursor: pointer; font-size: 0.85em; font-weight: bold;
    transition: background 0.2s;
}
.preset-grid button:hover { background: #007bff; }

.canvas-container { background: #1a1a1a; padding: 15px; border-radius: 8px; height: 350px; }
h3 { margin-top: 0; color: #fff; font-size: 1.1em; }
.hint { font-size: 0.85em; color: #777; margin-top: 15px; }