:root {
    /* CSS 变量，用于动态更改 UI 颜色 */
    --primary-color: #00fff2;
    --bg-dark: #050508;
    --glass-bg: rgba(20, 20, 25, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
}
body { 
    margin: 0; 
    overflow: hidden; 
    background-color: var(--bg-dark); 
    font-family: sans-serif; 
    -webkit-font-smoothing: antialiased; 
}
canvas { 
    display: block; 
    position: absolute; 
    top:0; 
    left:0; 
    z-index: 1; 
}
.input_video { 
    display: none; 
}

/* UI Panel - Glassmorphism Style */
#ui-container {
    position: absolute; 
    top: 20px; 
    right: 20px; 
    width: 260px;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    color: #eee;
    transition: opacity 0.3s;
}

h3 { 
    margin: 0 0 16px 0; 
    font-weight: 600; 
    letter-spacing: 1px; 
    font-size: 14px; 
    text-transform: uppercase; 
    color: var(--primary-color); 
}

.control-section { 
    margin-bottom: 24px; 
}
.label-txt { 
    display: block; 
    margin-bottom: 10px; 
    font-size: 12px; 
    opacity: 0.7; 
}

/* Shape Grid */
.shape-grid { 
    display: grid; 
    grid-template-columns: 1fr 1fr; /* 默认两列 */
    gap: 10px; 
}

/* 形状按钮样式 */
.shape-btn {
    background: rgba(255,255,255,0.05); 
    border: 1px solid var(--glass-border);
    color: #ccc; 
    padding: 12px; 
    border-radius: 8px; 
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); 
    font-size: 13px;
    display: flex; 
    align-items: center; 
    justify-content: center; 
    gap: 6px;
}
.shape-btn:hover { 
    background: rgba(255,255,255,0.1); 
    color: white; 
}
.shape-btn.active {
    /* 动态使用 primary-color 变量 */
    background: color-mix(in srgb, var(--primary-color) 15%, transparent);
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 0 15px color-mix(in srgb, var(--primary-color) 50%, transparent);
}

/* Color Picker */
.color-picker-wrapper {
    position: relative; 
    height: 40px; 
    border-radius: 8px; 
    overflow: hidden;
    border: 1px solid var(--glass-border); 
    cursor: pointer;
}
input[type="color"] {
    /* 放大色块以覆盖区域 */
    position: absolute; 
    top: -50%; 
    left: -50%; 
    width: 200%; 
    height: 200%;
    cursor: pointer; 
    border: none; 
    padding: 0; 
    margin: 0;
}

/* 底部状态和加载器 */
#loader {
    position: fixed; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%);
    color: var(--primary-color); 
    font-size: 14px; 
    z-index: 200; 
    pointer-events: none;
    text-align: center; 
    text-shadow: 0 0 10px color-mix(in srgb, var(--primary-color) 70%, transparent);
}
#status-debug {
    position: absolute; 
    bottom: -30px; 
    left: 0; 
    width: 100%;
    text-align: center; 
    font-size: 12px; 
    opacity: 0.6;
}

/* 全屏按钮样式 */
.fullscreen-btn {
    width: 100%;
    margin-top: 15px;
    padding: 12px;
    background: none;
    border: 1px solid var(--glass-border);
    color: var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}
.fullscreen-btn:hover {
    background: rgba(255,255,255,0.05);
}