/* 首屏 loading 样式：放在 public 静态目录，index.html 直接 link 引入，避免内联样式 */
html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    overflow: hidden;
}

#app-loading {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #0f172a;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

#particle-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.loader-ui {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.loader-brand {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: rgba(255, 255, 255, 0.9);
}

.loader-track {
    width: 200px;
    height: 2px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
    overflow: hidden;
}

.loader-bar {
    height: 100%;
    width: 0%;
    border-radius: 2px;
    background: linear-gradient(90deg, #6366f1, #818cf8);
    transition: width 0.2s ease;
}

.loader-pct {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.35);
    font-variant-numeric: tabular-nums;
}