body { margin: 0; overflow: hidden; font-family: 'Inter', sans-serif; background-color: #f0f4f8; }
canvas { display: block; }
#info {
    position: absolute;
    top: 10px;
    left: 10px;
    color: rgb(206, 15, 15);
    padding: 15px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    pointer-events: none;
    max-width: 350px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 10;
}
.ui-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 14px;
    background-color: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    z-index: 20;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #3b82f6;
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 10px 18px;
    border-radius: 9999px;
    border: none;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
    transition: background-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
    user-select: none;
    text-decoration: none;
    min-height: 42px;
}
.btn:hover {
    transform: scale(1.04);
}
.btn:active {
    transform: scale(0.96);
}
.btn-blue {
    background-color: #3b82f6;
}
.btn-blue:hover {
    background-color: #2563eb;
}
.btn-green {
    background-color: #10b981;
}
.btn-green:hover {
    background-color: #059669;
}
.btn-red {
    background-color: #ef4444;
}
.btn-red:hover {
    background-color: #dc2626;
}
.btn-neutral {
    background-color: #64748b;
}
.btn-neutral:hover {
    background-color: #475569;
}
.status-badge {
    display: inline-block;
    padding: 4px 10px;
    font-size: 0.85rem;
    border-radius: 9999px;
    font-weight: 600;
    vertical-align: middle;
}
.status-on {
    background-color: #10b981;
    color: #ffffff;
}
.status-off {
    background-color: #ef4444;
    color: #ffffff;
}

/* 粒子畫質與數量控制面板 */
.quality-control-container {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 6px 14px;
    border-radius: 9999px;
    color: #ffffff;
    font-size: 0.9rem;
}
.quality-label {
    font-weight: 600;
    color: #e2e8f0;
    white-space: nowrap;
}
.quality-buttons-group {
    display: flex;
    gap: 4px;
}
.quality-btn {
    background-color: #475569;
    color: #ffffff;
    border: 1px solid transparent;
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.1s ease;
}
.quality-btn:hover {
    background-color: #64748b;
}
.quality-btn.active {
    background-color: #3b82f6;
    border-color: #93c5fd;
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.5);
}
.particle-slider {
    width: 100px;
    cursor: pointer;
    accent-color: #3b82f6;
    vertical-align: middle;
}
.particle-count-display {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-weight: 700;
    color: #60a5fa;
    min-width: 48px;
    text-align: center;
}

@media (max-width: 768px) {
    #info {
        font-size: 0.8rem;
        padding: 10px;
        max-width: 280px;
    }
    .ui-container {
        padding: 10px 8px;
        gap: 6px;
    }
    .btn {
        padding: 8px 12px;
        font-size: 0.85rem;
        min-height: 38px;
    }
    .quality-control-container {
        padding: 4px 10px;
        font-size: 0.8rem;
    }
    .particle-slider {
        width: 80px;
    }
}