body {
    margin: 0;
    overflow: hidden;
    background-color: #050505;
    color: #fff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

canvas {
    display: block;
}

#ui-container {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
    background: rgba(15, 15, 15, 0.85);
    min-width: 236px;
    padding: 20px 20px 0;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    transition: padding 0.2s ease;
}

h1 {
    margin: 0 0 12px 0;
    font-size: 18px;
    letter-spacing: 1px;
    color: #eee;
}

#ui-container.is-collapsed h1 {
    margin-bottom: 0;
}

#panel-content {
    max-height: 320px;
    overflow: hidden;
    transition: max-height 0.22s ease, opacity 0.18s ease, margin 0.2s ease;
}

#ui-container.is-collapsed #panel-content {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 14px;
}

.preset-btn {
    appearance: none;
    min-height: 34px;
    padding: 7px 8px;
    color: #dcdcdc;
    background: #202020;
    border: 1px solid #3d3d3d;
    border-radius: 6px;
    font: inherit;
    font-size: 12px;
    line-height: 1.1;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.preset-btn:hover {
    color: #fff;
    background: #303030;
    border-color: #5b5b5b;
}

.preset-btn.is-active {
    color: #ffffff;
    background: #14314f;
    border-color: #4da6ff;
}

input[type="file"] {
    display: none;
}

.upload-btn {
    display: inline-block;
    width: 100%;
    box-sizing: border-box;
    text-align: center;
    padding: 10px 15px;
    background: #2a2a2a;
    border: 1px solid #444;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s ease;
}

.upload-btn:hover {
    background: #404040;
    border-color: #666;
}

.info {
    font-size: 13px;
    color: #aaa;
    margin-top: 15px;
    line-height: 1.6;
}

.highlight {
    color: #4da6ff;
    font-weight: bold;
}

#panel-toggle {
    appearance: none;
    display: block;
    width: calc(100% + 40px);
    height: 28px;
    margin: 16px -20px 0;
    padding: 0;
    color: #d8eaff;
    background: rgba(20, 20, 20, 0.42);
    border: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 0 0 12px 12px;
    font-size: 12px;
    line-height: 28px;
    cursor: pointer;
}

#panel-toggle:hover {
    color: #ffffff;
    border-top-color: #4da6ff;
    background: rgba(36, 36, 36, 0.72);
}