.float-buttons {
    position: fixed;
    right: var(--spacing-3);
    bottom: var(--spacing-6);
    z-index: var(--z-overlay);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.float-button {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 0.0625rem solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
}

.float-button:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
}

.float-button img {
    width: 1.125rem;
    height: 1.125rem;
    object-fit: contain;
    border-radius: 0;
}

.float-button .qrcode-container {
    position: absolute;
    right: calc(100% + var(--spacing-2));
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2);
    box-shadow: var(--shadow-lg);
    border: 0.0625rem solid var(--color-border);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    pointer-events: none;
    width: 9rem;
    height: 9rem;
}

.float-button:hover .qrcode-container {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.float-button .qrcode-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

#toTopBtn {
    opacity: 0;
    visibility: hidden;
    background: var(--color-text-primary);
    border-color: var(--color-text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-base), visibility var(--transition-base);
}

#toTopBtn.visible {
    opacity: 1;
    visibility: visible;
}