/* 极简现代风样式重置 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    overflow: hidden;
    background-color: #020202; /* 极致暗黑背景 */
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    touch-action: none; 
    color: #fff;
    cursor: grab;
}

body:active {
    cursor: grabbing;
}

/* 电影感暗角：压暗屏幕边缘，让视觉集中在 3D 中心 */
.vignette {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, transparent 40%, rgba(0,0,0,0.85) 100%);
    pointer-events: none;
    z-index: 10;
}

/* 顶部优雅的 UI 文字 */
.ui-header {
    position: fixed;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 20;
    pointer-events: none;
    mix-blend-mode: difference;
}

.ui-header h1 {
    font-size: 14px;
    letter-spacing: 8px;
    font-weight: 300;
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.9);
}

.ui-header p {
    font-size: 10px;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.4);
    text-transform: uppercase;
}

/* 高级感加载动画 */
#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #020202;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 100;
    transition: opacity 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.loader-ring {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-top: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

.loading-text {
    font-size: 12px;
    letter-spacing: 4px;
    color: rgba(255, 255, 255, 0.6);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}