html,
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: radial-gradient(circle at center, #10251f 0%, #071114 48%, #020406 100%);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

canvas {
    display: block;
}

#hint {
    position: fixed;
    left: 50%;
    bottom: 28px;
    transform: translateX(-50%);
    z-index: 10;
    padding: 12px 20px;
    color: rgba(235, 255, 244, 0.86);
    background: rgba(0, 16, 18, 0.28);
    border: 1px solid rgba(180, 255, 225, 0.14);
    border-radius: 999px;
    backdrop-filter: blur(10px);
    box-shadow: 0 0 24px rgba(110, 255, 190, 0.08);
    text-align: center;
    pointer-events: none;
    user-select: none;
}

#hint .title {
    font-size: 14px;
    letter-spacing: 0.08em;
    margin-bottom: 4px;
    color: rgba(230, 255, 245, 0.95);
}

#hint .line {
    font-size: 13px;
    white-space: nowrap;
}

#hint .small {
    margin-top: 4px;
    font-size: 11px;
    opacity: 0.55;
}

@media (max-width: 720px) {
    #hint {
    width: calc(100vw - 40px);
    border-radius: 18px;
    }

    #hint .line {
    white-space: normal;
    line-height: 1.5;
    }
}